/* * copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_AVCODEC_H #define AVCODEC_AVCODEC_H /** * @file * @ingroup libavc * Libavcodec external API header */ #include #include "libavutil/samplefmt.h" #include "libavutil/attributes.h" #include "libavutil/avutil.h" #include "libavutil/buffer.h" #include "libavutil/cpu.h" #include "libavutil/channel_layout.h" #include "libavutil/dict.h" #include "libavutil/frame.h" #include "libavutil/log.h" #include "libavutil/pixfmt.h" #include "libavutil/rational.h" #include "version.h" #if FF_API_FAST_MALLOC // to provide fast_*alloc #include "libavutil/mem.h" #endif /** * @defgroup libavc Encoding/Decoding Library * @{ * * @defgroup lavc_decoding Decoding * @{ * @} * * @defgroup lavc_encoding Encoding * @{ * @} * * @defgroup lavc_codec Codecs * @{ * @defgroup lavc_codec_native Native Codecs * @{ * @} * @defgroup lavc_codec_wrappers External library wrappers * @{ * @} * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge * @{ * @} * @} * @defgroup lavc_internal Internal * @{ * @} * @} * */ /** * @defgroup lavc_core Core functions/structures. * @ingroup libavc * * Basic definitions, functions for querying libavcodec capabilities, * allocating core structures, etc. * @{ */ /** * Identify the syntax and semantics of the bitstream. * The principle is roughly: * Two decoders with the same ID can decode the same streams. * Two encoders with the same ID can encode compatible streams. * There may be slight deviations from the principle due to implementation * details. * * If you add a codec ID to this list, add it so that * 1. no value of a existing codec ID changes (that would break ABI), * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec. * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts. * * After adding new codec IDs, do not forget to add an entry to the codec * descriptor list and bump libavcodec minor version. */ enum AVCodecID { AV_CODEC_ID_NONE, /* video codecs */ AV_CODEC_ID_MPEG1VIDEO, AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding #if FF_API_XVMC AV_CODEC_ID_MPEG2VIDEO_XVMC, #endif /* FF_API_XVMC */ AV_CODEC_ID_H261, AV_CODEC_ID_H263, AV_CODEC_ID_RV10, AV_CODEC_ID_RV20, AV_CODEC_ID_MJPEG, AV_CODEC_ID_MJPEGB, AV_CODEC_ID_LJPEG, AV_CODEC_ID_SP5X, AV_CODEC_ID_JPEGLS, AV_CODEC_ID_MPEG4, AV_CODEC_ID_RAWVIDEO, AV_CODEC_ID_MSMPEG4V1, AV_CODEC_ID_MSMPEG4V2, AV_CODEC_ID_MSMPEG4V3, AV_CODEC_ID_WMV1, AV_CODEC_ID_WMV2, AV_CODEC_ID_H263P, AV_CODEC_ID_H263I, AV_CODEC_ID_FLV1, AV_CODEC_ID_SVQ1, AV_CODEC_ID_SVQ3, AV_CODEC_ID_DVVIDEO, AV_CODEC_ID_HUFFYUV, AV_CODEC_ID_CYUV, AV_CODEC_ID_H264, AV_CODEC_ID_INDEO3, AV_CODEC_ID_VP3, AV_CODEC_ID_THEORA, AV_CODEC_ID_ASV1, AV_CODEC_ID_ASV2, AV_CODEC_ID_FFV1, AV_CODEC_ID_4XM, AV_CODEC_ID_VCR1, AV_CODEC_ID_CLJR, AV_CODEC_ID_MDEC, AV_CODEC_ID_ROQ, AV_CODEC_ID_INTERPLAY_VIDEO, AV_CODEC_ID_XAN_WC3, AV_CODEC_ID_XAN_WC4, AV_CODEC_ID_RPZA, AV_CODEC_ID_CINEPAK, AV_CODEC_ID_WS_VQA, AV_CODEC_ID_MSRLE, AV_CODEC_ID_MSVIDEO1, AV_CODEC_ID_IDCIN, AV_CODEC_ID_8BPS, AV_CODEC_ID_SMC, AV_CODEC_ID_FLIC, AV_CODEC_ID_TRUEMOTION1, AV_CODEC_ID_VMDVIDEO, AV_CODEC_ID_MSZH, AV_CODEC_ID_ZLIB, AV_CODEC_ID_QTRLE, AV_CODEC_ID_TSCC, AV_CODEC_ID_ULTI, AV_CODEC_ID_QDRAW, AV_CODEC_ID_VIXL, AV_CODEC_ID_QPEG, AV_CODEC_ID_PNG, AV_CODEC_ID_PPM, AV_CODEC_ID_PBM, AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PAM, AV_CODEC_ID_FFVHUFF, AV_CODEC_ID_RV30, AV_CODEC_ID_RV40, AV_CODEC_ID_VC1, AV_CODEC_ID_WMV3, AV_CODEC_ID_LOCO, AV_CODEC_ID_WNV1, AV_CODEC_ID_AASC, AV_CODEC_ID_INDEO2, AV_CODEC_ID_FRAPS, AV_CODEC_ID_TRUEMOTION2, AV_CODEC_ID_BMP, AV_CODEC_ID_CSCD, AV_CODEC_ID_MMVIDEO, AV_CODEC_ID_ZMBV, AV_CODEC_ID_AVS, AV_CODEC_ID_SMACKVIDEO, AV_CODEC_ID_NUV, AV_CODEC_ID_KMVC, AV_CODEC_ID_FLASHSV, AV_CODEC_ID_CAVS, AV_CODEC_ID_JPEG2000, AV_CODEC_ID_VMNC, AV_CODEC_ID_VP5, AV_CODEC_ID_VP6, AV_CODEC_ID_VP6F, AV_CODEC_ID_TARGA, AV_CODEC_ID_DSICINVIDEO, AV_CODEC_ID_TIERTEXSEQVIDEO, AV_CODEC_ID_TIFF, AV_CODEC_ID_GIF, AV_CODEC_ID_DXA, AV_CODEC_ID_DNXHD, AV_CODEC_ID_THP, AV_CODEC_ID_SGI, AV_CODEC_ID_C93, AV_CODEC_ID_BETHSOFTVID, AV_CODEC_ID_PTX, AV_CODEC_ID_TXD, AV_CODEC_ID_VP6A, AV_CODEC_ID_AMV, AV_CODEC_ID_VB, AV_CODEC_ID_PCX, AV_CODEC_ID_SUNRAST, AV_CODEC_ID_INDEO4, AV_CODEC_ID_INDEO5, AV_CODEC_ID_MIMIC, AV_CODEC_ID_RL2, AV_CODEC_ID_ESCAPE124, AV_CODEC_ID_DIRAC, AV_CODEC_ID_BFI, AV_CODEC_ID_CMV, AV_CODEC_ID_MOTIONPIXELS, AV_CODEC_ID_TGV, AV_CODEC_ID_TGQ, AV_CODEC_ID_TQI, AV_CODEC_ID_AURA, AV_CODEC_ID_AURA2, AV_CODEC_ID_V210X, AV_CODEC_ID_TMV, AV_CODEC_ID_V210, AV_CODEC_ID_DPX, AV_CODEC_ID_MAD, AV_CODEC_ID_FRWU, AV_CODEC_ID_FLASHSV2, AV_CODEC_ID_CDGRAPHICS, AV_CODEC_ID_R210, AV_CODEC_ID_ANM, AV_CODEC_ID_BINKVIDEO, AV_CODEC_ID_IFF_ILBM, AV_CODEC_ID_IFF_BYTERUN1, AV_CODEC_ID_KGV1, AV_CODEC_ID_YOP, AV_CODEC_ID_VP8, AV_CODEC_ID_PICTOR, AV_CODEC_ID_ANSI, AV_CODEC_ID_A64_MULTI, AV_CODEC_ID_A64_MULTI5, AV_CODEC_ID_R10K, AV_CODEC_ID_MXPEG, AV_CODEC_ID_LAGARITH, AV_CODEC_ID_PRORES, AV_CODEC_ID_JV, AV_CODEC_ID_DFA, AV_CODEC_ID_WMV3IMAGE, AV_CODEC_ID_VC1IMAGE, AV_CODEC_ID_UTVIDEO, AV_CODEC_ID_BMV_VIDEO, AV_CODEC_ID_VBLE, AV_CODEC_ID_DXTORY, AV_CODEC_ID_V410, AV_CODEC_ID_XWD, AV_CODEC_ID_CDXL, AV_CODEC_ID_XBM, AV_CODEC_ID_ZEROCODEC, AV_CODEC_ID_MSS1, AV_CODEC_ID_MSA1, AV_CODEC_ID_TSCC2, AV_CODEC_ID_MTS2, AV_CODEC_ID_CLLC, AV_CODEC_ID_MSS2, AV_CODEC_ID_VP9, AV_CODEC_ID_AIC, AV_CODEC_ID_ESCAPE130_DEPRECATED, AV_CODEC_ID_G2M_DEPRECATED, AV_CODEC_ID_WEBP_DEPRECATED, AV_CODEC_ID_HNM4_VIDEO, AV_CODEC_ID_HEVC_DEPRECATED, AV_CODEC_ID_FIC, AV_CODEC_ID_ALIAS_PIX, AV_CODEC_ID_BRENDER_PIX_DEPRECATED, AV_CODEC_ID_PAF_VIDEO_DEPRECATED, AV_CODEC_ID_EXR_DEPRECATED, AV_CODEC_ID_VP7_DEPRECATED, AV_CODEC_ID_SANM_DEPRECATED, AV_CODEC_ID_SGIRLE_DEPRECATED, AV_CODEC_ID_MVC1_DEPRECATED, AV_CODEC_ID_MVC2_DEPRECATED, AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'), AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'), AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'), AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'), AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'), AV_CODEC_ID_012V = MKBETAG('0','1','2','V'), AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'), AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'), AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'), AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'), AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'), AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'), AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'), AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'), AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'), AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'), AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'), AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'), AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'), AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'), AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'), AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'), AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'), AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'), AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'), #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'), /* various PCM "codecs" */ AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs AV_CODEC_ID_PCM_S16LE = 0x10000, AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_U16LE, AV_CODEC_ID_PCM_U16BE, AV_CODEC_ID_PCM_S8, AV_CODEC_ID_PCM_U8, AV_CODEC_ID_PCM_MULAW, AV_CODEC_ID_PCM_ALAW, AV_CODEC_ID_PCM_S32LE, AV_CODEC_ID_PCM_S32BE, AV_CODEC_ID_PCM_U32LE, AV_CODEC_ID_PCM_U32BE, AV_CODEC_ID_PCM_S24LE, AV_CODEC_ID_PCM_S24BE, AV_CODEC_ID_PCM_U24LE, AV_CODEC_ID_PCM_U24BE, AV_CODEC_ID_PCM_S24DAUD, AV_CODEC_ID_PCM_ZORK, AV_CODEC_ID_PCM_S16LE_PLANAR, AV_CODEC_ID_PCM_DVD, AV_CODEC_ID_PCM_F32BE, AV_CODEC_ID_PCM_F32LE, AV_CODEC_ID_PCM_F64BE, AV_CODEC_ID_PCM_F64LE, AV_CODEC_ID_PCM_BLURAY, AV_CODEC_ID_PCM_LXF, AV_CODEC_ID_S302M, AV_CODEC_ID_PCM_S8_PLANAR, AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED, AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED, AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'), AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'), AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16), /* various ADPCM codecs */ AV_CODEC_ID_ADPCM_IMA_QT = 0x11000, AV_CODEC_ID_ADPCM_IMA_WAV, AV_CODEC_ID_ADPCM_IMA_DK3, AV_CODEC_ID_ADPCM_IMA_DK4, AV_CODEC_ID_ADPCM_IMA_WS, AV_CODEC_ID_ADPCM_IMA_SMJPEG, AV_CODEC_ID_ADPCM_MS, AV_CODEC_ID_ADPCM_4XM, AV_CODEC_ID_ADPCM_XA, AV_CODEC_ID_ADPCM_ADX, AV_CODEC_ID_ADPCM_EA, AV_CODEC_ID_ADPCM_G726, AV_CODEC_ID_ADPCM_CT, AV_CODEC_ID_ADPCM_SWF, AV_CODEC_ID_ADPCM_YAMAHA, AV_CODEC_ID_ADPCM_SBPRO_4, AV_CODEC_ID_ADPCM_SBPRO_3, AV_CODEC_ID_ADPCM_SBPRO_2, AV_CODEC_ID_ADPCM_THP, AV_CODEC_ID_ADPCM_IMA_AMV, AV_CODEC_ID_ADPCM_EA_R1, AV_CODEC_ID_ADPCM_EA_R3, AV_CODEC_ID_ADPCM_EA_R2, AV_CODEC_ID_ADPCM_IMA_EA_SEAD, AV_CODEC_ID_ADPCM_IMA_EA_EACS, AV_CODEC_ID_ADPCM_EA_XAS, AV_CODEC_ID_ADPCM_EA_MAXIS_XA, AV_CODEC_ID_ADPCM_IMA_ISS, AV_CODEC_ID_ADPCM_G722, AV_CODEC_ID_ADPCM_IMA_APC, AV_CODEC_ID_ADPCM_VIMA_DEPRECATED, AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'), AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'), AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '), AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '), AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '), AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '), AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'), /* AMR */ AV_CODEC_ID_AMR_NB = 0x12000, AV_CODEC_ID_AMR_WB, /* RealAudio codecs*/ AV_CODEC_ID_RA_144 = 0x13000, AV_CODEC_ID_RA_288, /* various DPCM codecs */ AV_CODEC_ID_ROQ_DPCM = 0x14000, AV_CODEC_ID_INTERPLAY_DPCM, AV_CODEC_ID_XAN_DPCM, AV_CODEC_ID_SOL_DPCM, /* audio codecs */ AV_CODEC_ID_MP2 = 0x15000, AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3 AV_CODEC_ID_AAC, AV_CODEC_ID_AC3, AV_CODEC_ID_DTS, AV_CODEC_ID_VORBIS, AV_CODEC_ID_DVAUDIO, AV_CODEC_ID_WMAV1, AV_CODEC_ID_WMAV2, AV_CODEC_ID_MACE3, AV_CODEC_ID_MACE6, AV_CODEC_ID_VMDAUDIO, AV_CODEC_ID_FLAC, AV_CODEC_ID_MP3ADU, AV_CODEC_ID_MP3ON4, AV_CODEC_ID_SHORTEN, AV_CODEC_ID_ALAC, AV_CODEC_ID_WESTWOOD_SND1, AV_CODEC_ID_GSM, ///< as in Berlin toast format AV_CODEC_ID_QDM2, AV_CODEC_ID_COOK, AV_CODEC_ID_TRUESPEECH, AV_CODEC_ID_TTA, AV_CODEC_ID_SMACKAUDIO, AV_CODEC_ID_QCELP, AV_CODEC_ID_WAVPACK, AV_CODEC_ID_DSICINAUDIO, AV_CODEC_ID_IMC, AV_CODEC_ID_MUSEPACK7, AV_CODEC_ID_MLP, AV_CODEC_ID_GSM_MS, /* as found in WAV */ AV_CODEC_ID_ATRAC3, #if FF_API_VOXWARE AV_CODEC_ID_VOXWARE, #endif AV_CODEC_ID_APE, AV_CODEC_ID_NELLYMOSER, AV_CODEC_ID_MUSEPACK8, AV_CODEC_ID_SPEEX, AV_CODEC_ID_WMAVOICE, AV_CODEC_ID_WMAPRO, AV_CODEC_ID_WMALOSSLESS, AV_CODEC_ID_ATRAC3P, AV_CODEC_ID_EAC3, AV_CODEC_ID_SIPR, AV_CODEC_ID_MP1, AV_CODEC_ID_TWINVQ, AV_CODEC_ID_TRUEHD, AV_CODEC_ID_MP4ALS, AV_CODEC_ID_ATRAC1, AV_CODEC_ID_BINKAUDIO_RDFT, AV_CODEC_ID_BINKAUDIO_DCT, AV_CODEC_ID_AAC_LATM, AV_CODEC_ID_QDMC, AV_CODEC_ID_CELT, AV_CODEC_ID_G723_1, AV_CODEC_ID_G729, AV_CODEC_ID_8SVX_EXP, AV_CODEC_ID_8SVX_FIB, AV_CODEC_ID_BMV_AUDIO, AV_CODEC_ID_RALF, AV_CODEC_ID_IAC, AV_CODEC_ID_ILBC, AV_CODEC_ID_OPUS_DEPRECATED, AV_CODEC_ID_COMFORT_NOISE, AV_CODEC_ID_TAK_DEPRECATED, AV_CODEC_ID_METASOUND, AV_CODEC_ID_PAF_AUDIO_DEPRECATED, AV_CODEC_ID_ON2AVC, AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'), AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'), AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'), AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'), AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'), AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'), AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'), AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'), AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'), AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'), AV_CODEC_ID_DSD_LSBF_PLANAR = MKBETAG('D','S','D','1'), AV_CODEC_ID_DSD_MSBF_PLANAR = MKBETAG('D','S','D','8'), /* subtitle codecs */ AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs. AV_CODEC_ID_DVD_SUBTITLE = 0x17000, AV_CODEC_ID_DVB_SUBTITLE, AV_CODEC_ID_TEXT, ///< raw UTF-8 text AV_CODEC_ID_XSUB, AV_CODEC_ID_SSA, AV_CODEC_ID_MOV_TEXT, AV_CODEC_ID_HDMV_PGS_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT, AV_CODEC_ID_SRT, AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'), AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'), AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'), AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'), AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'), AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'), AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'), AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'), AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'), AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'), AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'), AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'), AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska /* other specific kind of codecs (generally used for attachments) */ AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs. AV_CODEC_ID_TTF = 0x18000, AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'), AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'), AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'), AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'), AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'), AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'), AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'), AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'), AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS * stream (only used by libavformat) */ AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems * stream (only used by libavformat) */ AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information. #if FF_API_CODEC_ID #include "old_codec_ids.h" #endif }; /** * This struct describes the properties of a single codec described by an * AVCodecID. * @see avcodec_get_descriptor() */ typedef struct AVCodecDescriptor { enum AVCodecID id; enum AVMediaType type; /** * Name of the codec described by this descriptor. It is non-empty and * unique for each codec descriptor. It should contain alphanumeric * characters and '_' only. */ const char *name; /** * A more descriptive name for this codec. May be NULL. */ const char *long_name; /** * Codec properties, a combination of AV_CODEC_PROP_* flags. */ int props; /** * MIME type(s) associated with the codec. * May be NULL; if not, a NULL-terminated array of MIME types. * The first item is always non-NULL and is the preferred MIME type. */ const char *const *mime_types; } AVCodecDescriptor; /** * Codec uses only intra compression. * Video codecs only. */ #define AV_CODEC_PROP_INTRA_ONLY (1 << 0) /** * Codec supports lossy compression. Audio and video codecs only. * @note a codec may support both lossy and lossless * compression modes */ #define AV_CODEC_PROP_LOSSY (1 << 1) /** * Codec supports lossless compression. Audio and video codecs only. */ #define AV_CODEC_PROP_LOSSLESS (1 << 2) /** * Codec supports frame reordering. That is, the coded order (the order in which * the encoded packets are output by the encoders / stored / input to the * decoders) may be different from the presentation order of the corresponding * frames. * * For codecs that do not have this property set, PTS and DTS should always be * equal. */ #define AV_CODEC_PROP_REORDER (1 << 3) /** * Subtitle codec is bitmap based * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field. */ #define AV_CODEC_PROP_BITMAP_SUB (1 << 16) /** * Subtitle codec is text based. * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field. */ #define AV_CODEC_PROP_TEXT_SUB (1 << 17) /** * @ingroup lavc_decoding * Required number of additionally allocated bytes at the end of the input bitstream for decoding. * This is mainly needed because some optimized bitstream readers read * 32 or 64 bit at once and could read over the end.
* Note: If the first 23 bits of the additional bytes are not 0, then damaged * MPEG bitstreams could cause overread and segfault. */ #define FF_INPUT_BUFFER_PADDING_SIZE 32 /** * @ingroup lavc_encoding * minimum encoding buffer size * Used to avoid some checks during header writing. */ #define FF_MIN_BUFFER_SIZE 16384 /** * @ingroup lavc_encoding * motion estimation type. */ enum Motion_Est_ID { ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed ME_FULL, ME_LOG, ME_PHODS, ME_EPZS, ///< enhanced predictive zonal search ME_X1, ///< reserved for experiments ME_HEX, ///< hexagon based search ME_UMH, ///< uneven multi-hexagon search ME_TESA, ///< transformed exhaustive search algorithm ME_ITER=50, ///< iterative search }; /** * @ingroup lavc_decoding */ enum AVDiscard{ /* We leave some space between them for extensions (drop some * keyframes for intra-only or drop just some bidir frames). */ AVDISCARD_NONE =-16, ///< discard nothing AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi AVDISCARD_NONREF = 8, ///< discard all non reference AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames AVDISCARD_NONINTRA= 24, ///< discard all non intra frames AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes AVDISCARD_ALL = 48, ///< discard all }; enum AVAudioServiceType { AV_AUDIO_SERVICE_TYPE_MAIN = 0, AV_AUDIO_SERVICE_TYPE_EFFECTS = 1, AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2, AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3, AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4, AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5, AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6, AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7, AV_AUDIO_SERVICE_TYPE_KARAOKE = 8, AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI }; /** * @ingroup lavc_encoding */ typedef struct RcOverride{ int start_frame; int end_frame; int qscale; // If this is 0 then quality_factor will be used instead. float quality_factor; } RcOverride; #if FF_API_MAX_BFRAMES /** * @deprecated there is no libavcodec-wide limit on the number of B-frames */ #define FF_MAX_B_FRAMES 16 #endif /* encoding support These flags can be passed in AVCodecContext.flags before initialization. Note: Not everything is supported yet. */ /** * Allow decoders to produce frames with data planes that are not aligned * to CPU requirements (e.g. due to cropping). */ #define CODEC_FLAG_UNALIGNED 0x0001 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale. #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263. #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC. #if FF_API_GMC /** * @deprecated use the "gmc" private option of the libxvid encoder */ #define CODEC_FLAG_GMC 0x0020 ///< Use GMC. #endif #if FF_API_MV0 /** * @deprecated use the flag "mv0" in the "mpv_flags" private option of the * mpegvideo encoders */ #define CODEC_FLAG_MV0 0x0040 #endif #if FF_API_INPUT_PRESERVED /** * @deprecated passing reference-counted frames to the encoders replaces this * flag */ #define CODEC_FLAG_INPUT_PRESERVED 0x0100 #endif #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode. #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode. #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale. #if FF_API_EMU_EDGE /** * @deprecated edges are not used/required anymore. I.e. this flag is now always * set. */ #define CODEC_FLAG_EMU_EDGE 0x4000 #endif #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding. #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random location instead of only at frame boundaries. */ #if FF_API_NORMALIZE_AQP /** * @deprecated use the flag "naq" in the "mpv_flags" private option of the * mpegvideo encoders */ #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 #endif #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT. #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay. #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe. #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT). /* Fx : Flag for h263+ extra options */ #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation #define CODEC_FLAG_CLOSED_GOP 0x80000000 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks. #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding. #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata. #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!! #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS. #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries. #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe /* Unsupported options : * Syntax Arithmetic coding (SAC) * Reference Picture Selection * Independent Segment Decoding */ /* /Fx */ /* codec capabilities */ #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback. /** * Codec uses get_buffer() for allocating buffers and supports custom allocators. * If not set, it might not use get_buffer() at all or use operations that * assume the buffer was allocated by avcodec_default_get_buffer. */ #define CODEC_CAP_DR1 0x0002 #define CODEC_CAP_TRUNCATED 0x0008 #if FF_API_XVMC /* Codec can export data for HW decoding. This flag indicates that * the codec would call get_format() with list that might contain HW accelerated * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them * including raw image format. * The application can use the passed context to determine bitstream version, * chroma format, resolution etc. */ #define CODEC_CAP_HWACCEL 0x0010 #endif /* FF_API_XVMC */ /** * Encoder or decoder requires flushing with NULL input at the end in order to * give the complete and correct output. * * NOTE: If this flag is not set, the codec is guaranteed to never be fed with * with NULL data. The user can still send NULL data to the public encode * or decode function, but libavcodec will not pass it along to the codec * unless this flag is set. * * Decoders: * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL, * avpkt->size=0 at the end to get the delayed data until the decoder no longer * returns frames. * * Encoders: * The encoder needs to be fed with NULL data at the end of encoding until the * encoder no longer returns data. * * NOTE: For encoders implementing the AVCodec.encode2() function, setting this * flag also means that the encoder must set the pts and duration for * each output packet. If this flag is not set, the pts and duration will * be determined by libavcodec from the input frame. */ #define CODEC_CAP_DELAY 0x0020 /** * Codec can be fed a final frame with a smaller size. * This can be used to prevent truncation of the last audio samples. */ #define CODEC_CAP_SMALL_LAST_FRAME 0x0040 #if FF_API_CAP_VDPAU /** * Codec can export data for HW decoding (VDPAU). */ #define CODEC_CAP_HWACCEL_VDPAU 0x0080 #endif /** * Codec can output multiple frames per AVPacket * Normally demuxers return one frame at a time, demuxers which do not do * are connected to a parser to split what they return into proper frames. * This flag is reserved to the very rare category of codecs which have a * bitstream that cannot be split into frames without timeconsuming * operations like full decoding. Demuxers carring such bitstreams thus * may return multiple frames in a packet. This has many disadvantages like * prohibiting stream copy in many cases thus it should only be considered * as a last resort. */ #define CODEC_CAP_SUBFRAMES 0x0100 /** * Codec is experimental and is thus avoided in favor of non experimental * encoders */ #define CODEC_CAP_EXPERIMENTAL 0x0200 /** * Codec should fill in channel configuration and samplerate instead of container */ #define CODEC_CAP_CHANNEL_CONF 0x0400 #if FF_API_NEG_LINESIZES /** * @deprecated no codecs use this capability */ #define CODEC_CAP_NEG_LINESIZES 0x0800 #endif /** * Codec supports frame-level multithreading. */ #define CODEC_CAP_FRAME_THREADS 0x1000 /** * Codec supports slice-based (or partition-based) multithreading. */ #define CODEC_CAP_SLICE_THREADS 0x2000 /** * Codec supports changed parameters at any point. */ #define CODEC_CAP_PARAM_CHANGE 0x4000 /** * Codec supports avctx->thread_count == 0 (auto). */ #define CODEC_CAP_AUTO_THREADS 0x8000 /** * Audio encoder supports receiving a different number of samples in each call. */ #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000 /** * Codec is intra only. */ #define CODEC_CAP_INTRA_ONLY 0x40000000 /** * Codec is lossless. */ #define CODEC_CAP_LOSSLESS 0x80000000 #if FF_API_MB_TYPE //The following defines may change, don't expect compatibility if you use them. #define MB_TYPE_INTRA4x4 0x0001 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific #define MB_TYPE_16x16 0x0008 #define MB_TYPE_16x8 0x0010 #define MB_TYPE_8x16 0x0020 #define MB_TYPE_8x8 0x0040 #define MB_TYPE_INTERLACED 0x0080 #define MB_TYPE_DIRECT2 0x0100 //FIXME #define MB_TYPE_ACPRED 0x0200 #define MB_TYPE_GMC 0x0400 #define MB_TYPE_SKIP 0x0800 #define MB_TYPE_P0L0 0x1000 #define MB_TYPE_P1L0 0x2000 #define MB_TYPE_P0L1 0x4000 #define MB_TYPE_P1L1 0x8000 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0) #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1) #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1) #define MB_TYPE_QUANT 0x00010000 #define MB_TYPE_CBP 0x00020000 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...) #endif /** * Pan Scan area. * This specifies the area which should be displayed. * Note there may be multiple such areas for one frame. */ typedef struct AVPanScan{ /** * id * - encoding: Set by user. * - decoding: Set by libavcodec. */ int id; /** * width and height in 1/16 pel * - encoding: Set by user. * - decoding: Set by libavcodec. */ int width; int height; /** * position of the top left corner in 1/16 pel for up to 3 fields/frames * - encoding: Set by user. * - decoding: Set by libavcodec. */ int16_t position[3][2]; }AVPanScan; #if FF_API_QSCALE_TYPE #define FF_QSCALE_TYPE_MPEG1 0 #define FF_QSCALE_TYPE_MPEG2 1 #define FF_QSCALE_TYPE_H264 2 #define FF_QSCALE_TYPE_VP56 3 #endif #if FF_API_GET_BUFFER #define FF_BUFFER_TYPE_INTERNAL 1 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user) #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared. #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything. #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore). #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer. #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content. #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update). #endif /** * The decoder will keep a reference to the frame and may reuse it later. */ #define AV_GET_BUFFER_FLAG_REF (1 << 0) /** * @defgroup lavc_packet AVPacket * * Types and functions for working with AVPacket. * @{ */ enum AVPacketSideDataType { AV_PKT_DATA_PALETTE, AV_PKT_DATA_NEW_EXTRADATA, /** * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows: * @code * u32le param_flags * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) * s32le channel_count * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) * u64le channel_layout * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) * s32le sample_rate * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) * s32le width * s32le height * @endcode */ AV_PKT_DATA_PARAM_CHANGE, /** * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of * structures with info about macroblocks relevant to splitting the * packet into smaller packets on macroblock edges (e.g. as for RFC 2190). * That is, it does not necessarily contain info about all macroblocks, * as long as the distance between macroblocks in the info is smaller * than the target payload size. * Each MB info structure is 12 bytes, and is laid out as follows: * @code * u32le bit offset from the start of the packet * u8 current quantizer at the start of the macroblock * u8 GOB number * u16le macroblock address within the GOB * u8 horizontal MV predictor * u8 vertical MV predictor * u8 horizontal MV predictor for block number 3 * u8 vertical MV predictor for block number 3 * @endcode */ AV_PKT_DATA_H263_MB_INFO, /** * This side data should be associated with an audio stream and contains * ReplayGain information in form of the AVReplayGain struct. */ AV_PKT_DATA_REPLAYGAIN, /** * This side data contains a 3x3 transformation matrix describing an affine * transformation that needs to be applied to the decoded video frames for * correct presentation. * * See libavutil/display.h for a detailed description of the data. */ AV_PKT_DATA_DISPLAYMATRIX, /** * Recommmends skipping the specified number of samples * @code * u32le number of samples to skip from start of this packet * u32le number of samples to skip from end of this packet * u8 reason for start skip * u8 reason for end skip (0=padding silence, 1=convergence) * @endcode */ AV_PKT_DATA_SKIP_SAMPLES=70, /** * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that * the packet may contain "dual mono" audio specific to Japanese DTV * and if it is true, recommends only the selected channel to be used. * @code * u8 selected channels (0=mail/left, 1=sub/right, 2=both) * @endcode */ AV_PKT_DATA_JP_DUALMONO, /** * A list of zero terminated key/value strings. There is no end marker for * the list, so it is required to rely on the side data size to stop. */ AV_PKT_DATA_STRINGS_METADATA, /** * Subtitle event position * @code * u32le x1 * u32le y1 * u32le x2 * u32le y2 * @endcode */ AV_PKT_DATA_SUBTITLE_POSITION, /** * Data found in BlockAdditional element of matroska container. There is * no end marker for the data, so it is required to rely on the side data * size to recognize the end. 8 byte id (as found in BlockAddId) followed * by data. */ AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, /** * The optional first identifier line of a WebVTT cue. */ AV_PKT_DATA_WEBVTT_IDENTIFIER, /** * The optional settings (rendering instructions) that immediately * follow the timestamp specifier of a WebVTT cue. */ AV_PKT_DATA_WEBVTT_SETTINGS, /** * A list of zero terminated key/value strings. There is no end marker for * the list, so it is required to rely on the side data size to stop. This * side data includes updated metadata which appeared in the stream. */ AV_PKT_DATA_METADATA_UPDATE, }; typedef struct AVPacketSideData { uint8_t *data; int size; enum AVPacketSideDataType type; } AVPacketSideData; /** * This structure stores compressed data. It is typically exported by demuxers * and then passed as input to decoders, or received as output from encoders and * then passed to muxers. * * For video, it should typically contain one compressed frame. For audio it may * contain several compressed frames. * * AVPacket is one of the few structs in FFmpeg, whose size is a part of public * ABI. Thus it may be allocated on stack and no new fields can be added to it * without libavcodec and libavformat major bump. * * The semantics of data ownership depends on the buf or destruct (deprecated) * fields. If either is set, the packet data is dynamically allocated and is * valid indefinitely until av_free_packet() is called (which in turn calls * av_buffer_unref()/the destruct callback to free the data). If neither is set, * the packet data is typically backed by some static buffer somewhere and is * only valid for a limited time (e.g. until the next read call when demuxing). * * The side data is always allocated with av_malloc() and is freed in * av_free_packet(). */ typedef struct AVPacket { /** * A reference to the reference-counted buffer where the packet data is * stored. * May be NULL, then the packet data is not reference-counted. */ AVBufferRef *buf; /** * Presentation timestamp in AVStream->time_base units; the time at which * the decompressed packet will be presented to the user. * Can be AV_NOPTS_VALUE if it is not stored in the file. * pts MUST be larger or equal to dts as presentation cannot happen before * decompression, unless one wants to view hex dumps. Some formats misuse * the terms dts and pts/cts to mean something different. Such timestamps * must be converted to true pts/dts before they are stored in AVPacket. */ int64_t pts; /** * Decompression timestamp in AVStream->time_base units; the time at which * the packet is decompressed. * Can be AV_NOPTS_VALUE if it is not stored in the file. */ int64_t dts; uint8_t *data; int size; int stream_index; /** * A combination of AV_PKT_FLAG values */ int flags; /** * Additional packet data that can be provided by the container. * Packet can contain several types of side information. */ AVPacketSideData *side_data; int side_data_elems; /** * Duration of this packet in AVStream->time_base units, 0 if unknown. * Equals next_pts - this_pts in presentation order. */ int duration; #if FF_API_DESTRUCT_PACKET attribute_deprecated void (*destruct)(struct AVPacket *); attribute_deprecated void *priv; #endif int64_t pos; ///< byte position in stream, -1 if unknown /** * Time difference in AVStream->time_base units from the pts of this * packet to the point at which the output from the decoder has converged * independent from the availability of previous frames. That is, the * frames are virtually identical no matter if decoding started from * the very first frame or from this keyframe. * Is AV_NOPTS_VALUE if unknown. * This field is not the display duration of the current packet. * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY * set. * * The purpose of this field is to allow seeking in streams that have no * keyframes in the conventional sense. It corresponds to the * recovery point SEI in H.264 and match_time_delta in NUT. It is also * essential for some types of subtitle streams to ensure that all * subtitles are correctly displayed after seeking. */ int64_t convergence_duration; } AVPacket; #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted enum AVSideDataParamChangeFlags { AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001, AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002, AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004, AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008, }; /** * @} */ struct AVCodecInternal; enum AVFieldOrder { AV_FIELD_UNKNOWN, AV_FIELD_PROGRESSIVE, AV_FIELD_TT, //< Top coded_first, top displayed first AV_FIELD_BB, //< Bottom coded first, bottom displayed first AV_FIELD_TB, //< Top coded first, bottom displayed first AV_FIELD_BT, //< Bottom coded first, top displayed first }; /** * main external API structure. * New fields can be added to the end with minor version bumps. * Removal, reordering and changes to existing fields require a major * version bump. * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user * applications. * sizeof(AVCodecContext) must not be used outside libav*. */ typedef struct AVCodecContext { /** * information on struct for av_log * - set by avcodec_alloc_context3 */ const AVClass *av_class; int log_level_offset; enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */ const struct AVCodec *codec; #if FF_API_CODEC_NAME /** * @deprecated this field is not used for anything in libavcodec */ attribute_deprecated char codec_name[32]; #endif enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */ /** * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). * This is used to work around some encoder bugs. * A demuxer should set this to what is stored in the field used to identify the codec. * If there are multiple such fields in a container then the demuxer should choose the one * which maximizes the information about the used codec. * If the codec tag field in a container is larger than 32 bits then the demuxer should * remap the longer ID to 32 bits with a table or other structure. Alternatively a new * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated * first. * - encoding: Set by user, if not then the default based on codec_id will be used. * - decoding: Set by user, will be converted to uppercase by libavcodec during init. */ unsigned int codec_tag; /** * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). * This is used to work around some encoder bugs. * - encoding: unused * - decoding: Set by user, will be converted to uppercase by libavcodec during init. */ unsigned int stream_codec_tag; void *priv_data; /** * Private context used for internal data. * * Unlike priv_data, this is not codec-specific. It is used in general * libavcodec functions. */ struct AVCodecInternal *internal; /** * Private data of the user, can be used to carry app specific stuff. * - encoding: Set by user. * - decoding: Set by user. */ void *opaque; /** * the average bitrate * - encoding: Set by user; unused for constant quantizer encoding. * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream. */ int bit_rate; /** * number of bits the bitstream is allowed to diverge from the reference. * the reference can be CBR (for CBR pass1) or VBR (for pass2) * - encoding: Set by user; unused for constant quantizer encoding. * - decoding: unused */ int bit_rate_tolerance; /** * Global quality for codecs which cannot change it per frame. * This should be proportional to MPEG-1/2/4 qscale. * - encoding: Set by user. * - decoding: unused */ int global_quality; /** * - encoding: Set by user. * - decoding: unused */ int compression_level; #define FF_COMPRESSION_DEFAULT -1 /** * CODEC_FLAG_*. * - encoding: Set by user. * - decoding: Set by user. */ int flags; /** * CODEC_FLAG2_* * - encoding: Set by user. * - decoding: Set by user. */ int flags2; /** * some codecs need / can use extradata like Huffman tables. * mjpeg: Huffman tables * rv10: additional flags * mpeg4: global headers (they can be in the bitstream or here) * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger * than extradata_size to avoid problems if it is read with the bitstream reader. * The bytewise contents of extradata must not depend on the architecture or CPU endianness. * - encoding: Set/allocated/freed by libavcodec. * - decoding: Set/allocated/freed by user. */ uint8_t *extradata; int extradata_size; /** * This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. For fixed-fps content, * timebase should be 1/framerate and timestamp increments should be * identically 1. * - encoding: MUST be set by user. * - decoding: Set by libavcodec. */ AVRational time_base; /** * For some codecs, the time base is closer to the field rate than the frame rate. * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration * if no telecine is used ... * * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2. */ int ticks_per_frame; /** * Codec delay. * * Encoding: Number of frames delay there will be from the encoder input to * the decoder output. (we assume the decoder matches the spec) * Decoding: Number of frames delay in addition to what a standard decoder * as specified in the spec would produce. * * Video: * Number of frames the decoded output will be delayed relative to the * encoded input. * * Audio: * For encoding, this is the number of "priming" samples added by the * encoder to the beginning of the stream. The decoded output will be * delayed by this many samples relative to the input to the encoder (or * more, if the decoder adds its own padding). * The timestamps on the output packets are adjusted by the encoder so * that they always refer to the first sample of the data actually * contained in the packet, including any added padding. * E.g. if the timebase is 1/samplerate and the timestamp of the first * input sample is 0, the timestamp of the first output packet will be * -delay. * * For decoding, this is the number of samples the decoder needs to * output before the decoder's output is valid. When seeking, you should * start decoding this many samples prior to your desired seek point. * * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int delay; /* video only */ /** * picture width / height. * - encoding: MUST be set by user. * - decoding: May be set by the user before opening the decoder if known e.g. * from the container. Some decoders will require the dimensions * to be set by the caller. During decoding, the decoder may * overwrite those values as required. */ int width, height; /** * Bitstream width / height, may be different from width/height e.g. when * the decoded frame is cropped before being output or lowres is enabled. * - encoding: unused * - decoding: May be set by the user before opening the decoder if known * e.g. from the container. During decoding, the decoder may * overwrite those values as required. */ int coded_width, coded_height; #if FF_API_ASPECT_EXTENDED #define FF_ASPECT_EXTENDED 15 #endif /** * the number of pictures in a group of pictures, or 0 for intra_only * - encoding: Set by user. * - decoding: unused */ int gop_size; /** * Pixel format, see AV_PIX_FMT_xxx. * May be set by the demuxer if known from headers. * May be overridden by the decoder if it knows better. * - encoding: Set by user. * - decoding: Set by user if known, overridden by libavcodec if known */ enum AVPixelFormat pix_fmt; /** * Motion estimation algorithm used for video coding. * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex), * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific] * - encoding: MUST be set by user. * - decoding: unused */ int me_method; /** * If non NULL, 'draw_horiz_band' is called by the libavcodec * decoder to draw a horizontal band. It improves cache usage. Not * all codecs can do that. You must check the codec capabilities * beforehand. * When multithreading is used, it may be called from multiple threads * at the same time; threads might draw different parts of the same AVFrame, * or multiple AVFrames, and there is no guarantee that slices will be drawn * in order. * The function is also used by hardware acceleration APIs. * It is called at least once during frame decoding to pass * the data needed for hardware render. * In that mode instead of pixel data, AVFrame points to * a structure specific to the acceleration API. The application * reads the structure and can change some fields to indicate progress * or mark state. * - encoding: unused * - decoding: Set by user. * @param height the height of the slice * @param y the y position of the slice * @param type 1->top field, 2->bottom field, 3->frame * @param offset offset into the AVFrame.data from which the slice should be read */ void (*draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height); /** * callback to negotiate the pixelFormat * @param fmt is the list of formats which are supported by the codec, * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality. * The first is always the native one. * @return the chosen format * - encoding: unused * - decoding: Set by user, if not set the native format will be chosen. */ enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt); /** * maximum number of B-frames between non-B-frames * Note: The output will be delayed by max_b_frames+1 relative to the input. * - encoding: Set by user. * - decoding: unused */ int max_b_frames; /** * qscale factor between IP and B-frames * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset). * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). * - encoding: Set by user. * - decoding: unused */ float b_quant_factor; /** obsolete FIXME remove */ int rc_strategy; #define FF_RC_STRATEGY_XVID 1 int b_frame_strategy; /** * qscale offset between IP and B-frames * - encoding: Set by user. * - decoding: unused */ float b_quant_offset; /** * Size of the frame reordering buffer in the decoder. * For MPEG-2 it is 1 IPB or 0 low delay IP. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int has_b_frames; /** * 0-> h263 quant 1-> mpeg quant * - encoding: Set by user. * - decoding: unused */ int mpeg_quant; /** * qscale factor between P and I-frames * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset). * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). * - encoding: Set by user. * - decoding: unused */ float i_quant_factor; /** * qscale offset between P and I-frames * - encoding: Set by user. * - decoding: unused */ float i_quant_offset; /** * luminance masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float lumi_masking; /** * temporary complexity masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float temporal_cplx_masking; /** * spatial complexity masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float spatial_cplx_masking; /** * p block masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float p_masking; /** * darkness masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float dark_masking; /** * slice count * - encoding: Set by libavcodec. * - decoding: Set by user (or 0). */ int slice_count; /** * prediction method (needed for huffyuv) * - encoding: Set by user. * - decoding: unused */ int prediction_method; #define FF_PRED_LEFT 0 #define FF_PRED_PLANE 1 #define FF_PRED_MEDIAN 2 /** * slice offsets in the frame in bytes * - encoding: Set/allocated by libavcodec. * - decoding: Set/allocated by user (or NULL). */ int *slice_offset; /** * sample aspect ratio (0 if unknown) * That is the width of a pixel divided by the height of the pixel. * Numerator and denominator must be relatively prime and smaller than 256 for some video standards. * - encoding: Set by user. * - decoding: Set by libavcodec. */ AVRational sample_aspect_ratio; /** * motion estimation comparison function * - encoding: Set by user. * - decoding: unused */ int me_cmp; /** * subpixel motion estimation comparison function * - encoding: Set by user. * - decoding: unused */ int me_sub_cmp; /** * macroblock comparison function (not supported yet) * - encoding: Set by user. * - decoding: unused */ int mb_cmp; /** * interlaced DCT comparison function * - encoding: Set by user. * - decoding: unused */ int ildct_cmp; #define FF_CMP_SAD 0 #define FF_CMP_SSE 1 #define FF_CMP_SATD 2 #define FF_CMP_DCT 3 #define FF_CMP_PSNR 4 #define FF_CMP_BIT 5 #define FF_CMP_RD 6 #define FF_CMP_ZERO 7 #define FF_CMP_VSAD 8 #define FF_CMP_VSSE 9 #define FF_CMP_NSSE 10 #define FF_CMP_W53 11 #define FF_CMP_W97 12 #define FF_CMP_DCTMAX 13 #define FF_CMP_DCT264 14 #define FF_CMP_CHROMA 256 /** * ME diamond size & shape * - encoding: Set by user. * - decoding: unused */ int dia_size; /** * amount of previous MV predictors (2a+1 x 2a+1 square) * - encoding: Set by user. * - decoding: unused */ int last_predictor_count; /** * prepass for motion estimation * - encoding: Set by user. * - decoding: unused */ int pre_me; /** * motion estimation prepass comparison function * - encoding: Set by user. * - decoding: unused */ int me_pre_cmp; /** * ME prepass diamond size & shape * - encoding: Set by user. * - decoding: unused */ int pre_dia_size; /** * subpel ME quality * - encoding: Set by user. * - decoding: unused */ int me_subpel_quality; /** * DTG active format information (additional aspect ratio * information only used in DVB MPEG-2 transport streams) * 0 if not set. * * - encoding: unused * - decoding: Set by decoder. */ int dtg_active_format; #define FF_DTG_AFD_SAME 8 #define FF_DTG_AFD_4_3 9 #define FF_DTG_AFD_16_9 10 #define FF_DTG_AFD_14_9 11 #define FF_DTG_AFD_4_3_SP_14_9 13 #define FF_DTG_AFD_16_9_SP_14_9 14 #define FF_DTG_AFD_SP_4_3 15 /** * maximum motion estimation search range in subpel units * If 0 then no limit. * * - encoding: Set by user. * - decoding: unused */ int me_range; /** * intra quantizer bias * - encoding: Set by user. * - decoding: unused */ int intra_quant_bias; #define FF_DEFAULT_QUANT_BIAS 999999 /** * inter quantizer bias * - encoding: Set by user. * - decoding: unused */ int inter_quant_bias; /** * slice flags * - encoding: unused * - decoding: Set by user. */ int slice_flags; #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics) #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1) #if FF_API_XVMC /** * XVideo Motion Acceleration * - encoding: forbidden * - decoding: set by decoder * @deprecated XvMC doesn't need it anymore. */ attribute_deprecated int xvmc_acceleration; #endif /* FF_API_XVMC */ /** * macroblock decision mode * - encoding: Set by user. * - decoding: unused */ int mb_decision; #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits #define FF_MB_DECISION_RD 2 ///< rate distortion /** * custom intra quantization matrix * - encoding: Set by user, can be NULL. * - decoding: Set by libavcodec. */ uint16_t *intra_matrix; /** * custom inter quantization matrix * - encoding: Set by user, can be NULL. * - decoding: Set by libavcodec. */ uint16_t *inter_matrix; /** * scene change detection threshold * 0 is default, larger means fewer detected scene changes. * - encoding: Set by user. * - decoding: unused */ int scenechange_threshold; /** * noise reduction strength * - encoding: Set by user. * - decoding: unused */ int noise_reduction; /** * Motion estimation threshold below which no motion estimation is * performed, but instead the user specified motion vectors are used. * * - encoding: Set by user. * - decoding: unused */ int me_threshold; /** * Macroblock threshold below which the user specified macroblock types will be used. * - encoding: Set by user. * - decoding: unused */ int mb_threshold; /** * precision of the intra DC coefficient - 8 * - encoding: Set by user. * - decoding: unused */ int intra_dc_precision; /** * Number of macroblock rows at the top which are skipped. * - encoding: unused * - decoding: Set by user. */ int skip_top; /** * Number of macroblock rows at the bottom which are skipped. * - encoding: unused * - decoding: Set by user. */ int skip_bottom; /** * Border processing masking, raises the quantizer for mbs on the borders * of the picture. * - encoding: Set by user. * - decoding: unused */ float border_masking; /** * minimum MB lagrange multipler * - encoding: Set by user. * - decoding: unused */ int mb_lmin; /** * maximum MB lagrange multipler * - encoding: Set by user. * - decoding: unused */ int mb_lmax; /** * * - encoding: Set by user. * - decoding: unused */ int me_penalty_compensation; /** * * - encoding: Set by user. * - decoding: unused */ int bidir_refine; /** * * - encoding: Set by user. * - decoding: unused */ int brd_scale; /** * minimum GOP size * - encoding: Set by user. * - decoding: unused */ int keyint_min; /** * number of reference frames * - encoding: Set by user. * - decoding: Set by lavc. */ int refs; /** * chroma qp offset from luma * - encoding: Set by user. * - decoding: unused */ int chromaoffset; /** * Multiplied by qscale for each frame and added to scene_change_score. * - encoding: Set by user. * - decoding: unused */ int scenechange_factor; /** * * Note: Value depends upon the compare function used for fullpel ME. * - encoding: Set by user. * - decoding: unused */ int mv0_threshold; /** * Adjust sensitivity of b_frame_strategy 1. * - encoding: Set by user. * - decoding: unused */ int b_sensitivity; /** * Chromaticity coordinates of the source primaries. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorPrimaries color_primaries; /** * Color Transfer Characteristic. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorTransferCharacteristic color_trc; /** * YUV colorspace type. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorSpace colorspace; /** * MPEG vs JPEG YUV range. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorRange color_range; /** * This defines the location of chroma samples. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVChromaLocation chroma_sample_location; /** * Number of slices. * Indicates number of picture subdivisions. Used for parallelized * decoding. * - encoding: Set by user * - decoding: unused */ int slices; /** Field order * - encoding: set by libavcodec * - decoding: Set by user. */ enum AVFieldOrder field_order; /* audio only */ int sample_rate; ///< samples per second int channels; ///< number of audio channels /** * audio sample format * - encoding: Set by user. * - decoding: Set by libavcodec. */ enum AVSampleFormat sample_fmt; ///< sample format /* The following data should not be initialized. */ /** * Number of samples per channel in an audio frame. * * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame * except the last must contain exactly frame_size samples per channel. * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the * frame size is not restricted. * - decoding: may be set by some decoders to indicate constant frame size */ int frame_size; /** * Frame counter, set by libavcodec. * * - decoding: total number of frames returned from the decoder so far. * - encoding: total number of frames passed to the encoder so far. * * @note the counter is not incremented if encoding/decoding resulted in * an error. */ int frame_number; /** * number of bytes per packet if constant and known or 0 * Used by some WAV based audio codecs. */ int block_align; /** * Audio cutoff bandwidth (0 means "automatic") * - encoding: Set by user. * - decoding: unused */ int cutoff; #if FF_API_REQUEST_CHANNELS /** * Decoder should decode to this many channels if it can (0 for default) * - encoding: unused * - decoding: Set by user. * @deprecated Deprecated in favor of request_channel_layout. */ attribute_deprecated int request_channels; #endif /** * Audio channel layout. * - encoding: set by user. * - decoding: set by user, may be overwritten by libavcodec. */ uint64_t channel_layout; /** * Request decoder to use this channel layout if it can (0 for default) * - encoding: unused * - decoding: Set by user. */ uint64_t request_channel_layout; /** * Type of service that the audio stream conveys. * - encoding: Set by user. * - decoding: Set by libavcodec. */ enum AVAudioServiceType audio_service_type; /** * desired sample format * - encoding: Not used. * - decoding: Set by user. * Decoder will decode to this format if it can. */ enum AVSampleFormat request_sample_fmt; #if FF_API_GET_BUFFER /** * Called at the beginning of each frame to get a buffer for it. * * The function will set AVFrame.data[], AVFrame.linesize[]. * AVFrame.extended_data[] must also be set, but it should be the same as * AVFrame.data[] except for planar audio with more channels than can fit * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as * many data pointers as it can hold. * * if CODEC_CAP_DR1 is not set then get_buffer() must call * avcodec_default_get_buffer() instead of providing buffers allocated by * some other means. * * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't * need it. avcodec_default_get_buffer() aligns the output buffer properly, * but if get_buffer() is overridden then alignment considerations should * be taken into account. * * @see avcodec_default_get_buffer() * * Video: * * If pic.reference is set then the frame will be read later by libavcodec. * avcodec_align_dimensions2() should be used to find the required width and * height, as they normally need to be rounded up to the next multiple of 16. * * If frame multithreading is used and thread_safe_callbacks is set, * it may be called from a different thread, but not from more than one at * once. Does not need to be reentrant. * * @see release_buffer(), reget_buffer() * @see avcodec_align_dimensions2() * * Audio: * * Decoders request a buffer of a particular size by setting * AVFrame.nb_samples prior to calling get_buffer(). The decoder may, * however, utilize only part of the buffer by setting AVFrame.nb_samples * to a smaller value in the output frame. * * Decoders cannot use the buffer after returning from * avcodec_decode_audio4(), so they will not call release_buffer(), as it * is assumed to be released immediately upon return. In some rare cases, * a decoder may need to call get_buffer() more than once in a single * call to avcodec_decode_audio4(). In that case, when get_buffer() is * called again after it has already been called once, the previously * acquired buffer is assumed to be released at that time and may not be * reused by the decoder. * * As a convenience, av_samples_get_buffer_size() and * av_samples_fill_arrays() in libavutil may be used by custom get_buffer() * functions to find the required data size and to fill data pointers and * linesize. In AVFrame.linesize, only linesize[0] may be set for audio * since all planes must be the same size. * * @see av_samples_get_buffer_size(), av_samples_fill_arrays() * * - encoding: unused * - decoding: Set by libavcodec, user can override. * * @deprecated use get_buffer2() */ attribute_deprecated int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic); /** * Called to release buffers which were allocated with get_buffer. * A released buffer can be reused in get_buffer(). * pic.data[*] must be set to NULL. * May be called from a different thread if frame multithreading is used, * but not by more than one thread at once, so does not need to be reentrant. * - encoding: unused * - decoding: Set by libavcodec, user can override. * * @deprecated custom freeing callbacks should be set from get_buffer2() */ attribute_deprecated void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic); /** * Called at the beginning of a frame to get cr buffer for it. * Buffer type (size, hints) must be the same. libavcodec won't check it. * libavcodec will pass previous buffer in pic, function should return * same buffer or new buffer with old frame "painted" into it. * If pic.data[0] == NULL must behave like get_buffer(). * if CODEC_CAP_DR1 is not set then reget_buffer() must call * avcodec_default_reget_buffer() instead of providing buffers allocated by * some other means. * - encoding: unused * - decoding: Set by libavcodec, user can override. */ attribute_deprecated int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic); #endif /** * This callback is called at the beginning of each frame to get data * buffer(s) for it. There may be one contiguous buffer for all the data or * there may be a buffer per each data plane or anything in between. What * this means is, you may set however many entries in buf[] you feel necessary. * Each buffer must be reference-counted using the AVBuffer API (see description * of buf[] below). * * The following fields will be set in the frame before this callback is * called: * - format * - width, height (video only) * - sample_rate, channel_layout, nb_samples (audio only) * Their values may differ from the corresponding values in * AVCodecContext. This callback must use the frame values, not the codec * context values, to calculate the required buffer size. * * This callback must fill the following fields in the frame: * - data[] * - linesize[] * - extended_data: * * if the data is planar audio with more than 8 channels, then this * callback must allocate and fill extended_data to contain all pointers * to all data planes. data[] must hold as many pointers as it can. * extended_data must be allocated with av_malloc() and will be freed in * av_frame_unref(). * * otherwise exended_data must point to data * - buf[] must contain one or more pointers to AVBufferRef structures. Each of * the frame's data and extended_data pointers must be contained in these. That * is, one AVBufferRef for each allocated chunk of memory, not necessarily one * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(), * and av_buffer_ref(). * - extended_buf and nb_extended_buf must be allocated with av_malloc() by * this callback and filled with the extra buffers if there are more * buffers than buf[] can hold. extended_buf will be freed in * av_frame_unref(). * * If CODEC_CAP_DR1 is not set then get_buffer2() must call * avcodec_default_get_buffer2() instead of providing buffers allocated by * some other means. * * Each data plane must be aligned to the maximum required by the target * CPU. * * @see avcodec_default_get_buffer2() * * Video: * * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused * (read and/or written to if it is writable) later by libavcodec. * * avcodec_align_dimensions2() should be used to find the required width and * height, as they normally need to be rounded up to the next multiple of 16. * * Some decoders do not support linesizes changing between frames. * * If frame multithreading is used and thread_safe_callbacks is set, * this callback may be called from a different thread, but not from more * than one at once. Does not need to be reentrant. * * @see avcodec_align_dimensions2() * * Audio: * * Decoders request a buffer of a particular size by setting * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may, * however, utilize only part of the buffer by setting AVFrame.nb_samples * to a smaller value in the output frame. * * As a convenience, av_samples_get_buffer_size() and * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2() * functions to find the required data size and to fill data pointers and * linesize. In AVFrame.linesize, only linesize[0] may be set for audio * since all planes must be the same size. * * @see av_samples_get_buffer_size(), av_samples_fill_arrays() * * - encoding: unused * - decoding: Set by libavcodec, user can override. */ int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags); /** * If non-zero, the decoded audio and video frames returned from * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted * and are valid indefinitely. The caller must free them with * av_frame_unref() when they are not needed anymore. * Otherwise, the decoded frames must not be freed by the caller and are * only valid until the next decode call. * * - encoding: unused * - decoding: set by the caller before avcodec_open2(). */ int refcounted_frames; /* - encoding parameters */ float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0) float qblur; ///< amount of qscale smoothing over time (0.0-1.0) /** * minimum quantizer * - encoding: Set by user. * - decoding: unused */ int qmin; /** * maximum quantizer * - encoding: Set by user. * - decoding: unused */ int qmax; /** * maximum quantizer difference between frames * - encoding: Set by user. * - decoding: unused */ int max_qdiff; /** * ratecontrol qmin qmax limiting method * 0-> clipping, 1-> use a nice continuous function to limit qscale within qmin/qmax. * - encoding: Set by user. * - decoding: unused */ float rc_qsquish; float rc_qmod_amp; int rc_qmod_freq; /** * decoder bitstream buffer size * - encoding: Set by user. * - decoding: unused */ int rc_buffer_size; /** * ratecontrol override, see RcOverride * - encoding: Allocated/set/freed by user. * - decoding: unused */ int rc_override_count; RcOverride *rc_override; /** * rate control equation * - encoding: Set by user * - decoding: unused */ const char *rc_eq; /** * maximum bitrate * - encoding: Set by user. * - decoding: Set by libavcodec. */ int rc_max_rate; /** * minimum bitrate * - encoding: Set by user. * - decoding: unused */ int rc_min_rate; float rc_buffer_aggressivity; /** * initial complexity for pass1 ratecontrol * - encoding: Set by user. * - decoding: unused */ float rc_initial_cplx; /** * Ratecontrol attempt to use, at maximum, of what can be used without an underflow. * - encoding: Set by user. * - decoding: unused. */ float rc_max_available_vbv_use; /** * Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow. * - encoding: Set by user. * - decoding: unused. */ float rc_min_vbv_overflow_use; /** * Number of bits which should be loaded into the rc buffer before decoding starts. * - encoding: Set by user. * - decoding: unused */ int rc_initial_buffer_occupancy; #define FF_CODER_TYPE_VLC 0 #define FF_CODER_TYPE_AC 1 #define FF_CODER_TYPE_RAW 2 #define FF_CODER_TYPE_RLE 3 #define FF_CODER_TYPE_DEFLATE 4 /** * coder type * - encoding: Set by user. * - decoding: unused */ int coder_type; /** * context model * - encoding: Set by user. * - decoding: unused */ int context_model; /** * minimum Lagrange multiplier * - encoding: Set by user. * - decoding: unused */ int lmin; /** * maximum Lagrange multiplier * - encoding: Set by user. * - decoding: unused */ int lmax; /** * frame skip threshold * - encoding: Set by user. * - decoding: unused */ int frame_skip_threshold; /** * frame skip factor * - encoding: Set by user. * - decoding: unused */ int frame_skip_factor; /** * frame skip exponent * - encoding: Set by user. * - decoding: unused */ int frame_skip_exp; /** * frame skip comparison function * - encoding: Set by user. * - decoding: unused */ int frame_skip_cmp; /** * trellis RD quantization * - encoding: Set by user. * - decoding: unused */ int trellis; /** * - encoding: Set by user. * - decoding: unused */ int min_prediction_order; /** * - encoding: Set by user. * - decoding: unused */ int max_prediction_order; /** * GOP timecode frame start number * - encoding: Set by user, in non drop frame format * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset) */ int64_t timecode_frame_start; /* The RTP callback: This function is called */ /* every time the encoder has a packet to send. */ /* It depends on the encoder if the data starts */ /* with a Start Code (it should). H.263 does. */ /* mb_nb contains the number of macroblocks */ /* encoded in the RTP payload. */ void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb); int rtp_payload_size; /* The size of the RTP payload: the coder will */ /* do its best to deliver a chunk with size */ /* below rtp_payload_size, the chunk will start */ /* with a start code on some codecs like H.263. */ /* This doesn't take account of any particular */ /* headers inside the transmitted RTP payload. */ /* statistics, used for 2-pass encoding */ int mv_bits; int header_bits; int i_tex_bits; int p_tex_bits; int i_count; int p_count; int skip_count; int misc_bits; /** * number of bits used for the previously encoded frame * - encoding: Set by libavcodec. * - decoding: unused */ int frame_bits; /** * pass1 encoding statistics output buffer * - encoding: Set by libavcodec. * - decoding: unused */ char *stats_out; /** * pass2 encoding statistics input buffer * Concatenated stuff from stats_out of pass1 should be placed here. * - encoding: Allocated/set/freed by user. * - decoding: unused */ char *stats_in; /** * Work around bugs in encoders which sometimes cannot be detected automatically. * - encoding: Set by user * - decoding: Set by user */ int workaround_bugs; #define FF_BUG_AUTODETECT 1 ///< autodetection #if FF_API_OLD_MSMPEG4 #define FF_BUG_OLD_MSMPEG4 2 #endif #define FF_BUG_XVID_ILACE 4 #define FF_BUG_UMP4 8 #define FF_BUG_NO_PADDING 16 #define FF_BUG_AMV 32 #if FF_API_AC_VLC #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default. #endif #define FF_BUG_QPEL_CHROMA 64 #define FF_BUG_STD_QPEL 128 #define FF_BUG_QPEL_CHROMA2 256 #define FF_BUG_DIRECT_BLOCKSIZE 512 #define FF_BUG_EDGE 1024 #define FF_BUG_HPEL_CHROMA 2048 #define FF_BUG_DC_CLIP 4096 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders. #define FF_BUG_TRUNCATED 16384 /** * strictly follow the standard (MPEG4, ...). * - encoding: Set by user. * - decoding: Set by user. * Setting this to STRICT or higher means the encoder and decoder will * generally do stupid things, whereas setting it to unofficial or lower * will mean the encoder might produce output that is not supported by all * spec-compliant decoders. Decoders don't differentiate between normal, * unofficial and experimental (that is, they always try to decode things * when they can) unless they are explicitly asked to behave stupidly * (=strictly conform to the specs) */ int strict_std_compliance; #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software. #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences. #define FF_COMPLIANCE_NORMAL 0 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things. /** * error concealment flags * - encoding: unused * - decoding: Set by user. */ int error_concealment; #define FF_EC_GUESS_MVS 1 #define FF_EC_DEBLOCK 2 #define FF_EC_FAVOR_INTER 256 /** * debug * - encoding: Set by user. * - decoding: Set by user. */ int debug; #define FF_DEBUG_PICT_INFO 1 #define FF_DEBUG_RC 2 #define FF_DEBUG_BITSTREAM 4 #define FF_DEBUG_MB_TYPE 8 #define FF_DEBUG_QP 16 #if FF_API_DEBUG_MV /** * @deprecated this option does nothing */ #define FF_DEBUG_MV 32 #endif #define FF_DEBUG_DCT_COEFF 0x00000040 #define FF_DEBUG_SKIP 0x00000080 #define FF_DEBUG_STARTCODE 0x00000100 #define FF_DEBUG_PTS 0x00000200 #define FF_DEBUG_ER 0x00000400 #define FF_DEBUG_MMCO 0x00000800 #define FF_DEBUG_BUGS 0x00001000 #if FF_API_DEBUG_MV #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec #endif #define FF_DEBUG_BUFFERS 0x00008000 #define FF_DEBUG_THREADS 0x00010000 #define FF_DEBUG_NOMC 0x01000000 #if FF_API_DEBUG_MV /** * debug * Code outside libavcodec should access this field using AVOptions * - encoding: Set by user. * - decoding: Set by user. */ int debug_mv; #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames #endif /** * Error recognition; may misdetect some more or less valid parts as errors. * - encoding: unused * - decoding: Set by user. */ int err_recognition; /** * Verify checksums embedded in the bitstream (could be of either encoded or * decoded data, depending on the codec) and print an error message on mismatch. * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the * decoder returning an error. */ #define AV_EF_CRCCHECK (1<<0) #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error /** * opaque 64bit number (generally a PTS) that will be reordered and * output in AVFrame.reordered_opaque * @deprecated in favor of pkt_pts * - encoding: unused * - decoding: Set by user. */ int64_t reordered_opaque; /** * Hardware accelerator in use * - encoding: unused. * - decoding: Set by libavcodec */ struct AVHWAccel *hwaccel; /** * Hardware accelerator context. * For some hardware accelerators, a global context needs to be * provided by the user. In that case, this holds display-dependent * data FFmpeg cannot instantiate itself. Please refer to the * FFmpeg HW accelerator documentation to know how to fill this * is. e.g. for VA API, this is a struct vaapi_context. * - encoding: unused * - decoding: Set by user */ void *hwaccel_context; /** * error * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR. * - decoding: unused */ uint64_t error[AV_NUM_DATA_POINTERS]; /** * DCT algorithm, see FF_DCT_* below * - encoding: Set by user. * - decoding: unused */ int dct_algo; #define FF_DCT_AUTO 0 #define FF_DCT_FASTINT 1 #define FF_DCT_INT 2 #define FF_DCT_MMX 3 #define FF_DCT_ALTIVEC 5 #define FF_DCT_FAAN 6 /** * IDCT algorithm, see FF_IDCT_* below. * - encoding: Set by user. * - decoding: Set by user. */ int idct_algo; #define FF_IDCT_AUTO 0 #define FF_IDCT_INT 1 #define FF_IDCT_SIMPLE 2 #define FF_IDCT_SIMPLEMMX 3 #define FF_IDCT_ARM 7 #define FF_IDCT_ALTIVEC 8 #if FF_API_ARCH_SH4 #define FF_IDCT_SH4 9 #endif #define FF_IDCT_SIMPLEARM 10 #define FF_IDCT_IPP 13 #define FF_IDCT_XVIDMMX 14 #define FF_IDCT_SIMPLEARMV5TE 16 #define FF_IDCT_SIMPLEARMV6 17 #if FF_API_ARCH_SPARC #define FF_IDCT_SIMPLEVIS 18 #endif #define FF_IDCT_FAAN 20 #define FF_IDCT_SIMPLENEON 22 #if FF_API_ARCH_ALPHA #define FF_IDCT_SIMPLEALPHA 23 #endif #define FF_IDCT_SIMPLEAUTO 128 /** * bits per sample/pixel from the demuxer (needed for huffyuv). * - encoding: Set by libavcodec. * - decoding: Set by user. */ int bits_per_coded_sample; /** * Bits per sample/pixel of internal libavcodec pixel/sample format. * - encoding: set by user. * - decoding: set by libavcodec. */ int bits_per_raw_sample; #if FF_API_LOWRES /** * low resolution decoding, 1-> 1/2 size, 2->1/4 size * - encoding: unused * - decoding: Set by user. * Code outside libavcodec should access this field using: * av_codec_{get,set}_lowres(avctx) */ int lowres; #endif /** * the picture in the bitstream * - encoding: Set by libavcodec. * - decoding: unused */ AVFrame *coded_frame; /** * thread count * is used to decide how many independent tasks should be passed to execute() * - encoding: Set by user. * - decoding: Set by user. */ int thread_count; /** * Which multithreading methods to use. * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread, * so clients which cannot provide future frames should not use it. * * - encoding: Set by user, otherwise the default is used. * - decoding: Set by user, otherwise the default is used. */ int thread_type; #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once /** * Which multithreading methods are in use by the codec. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int active_thread_type; /** * Set by the client if its custom get_buffer() callback can be called * synchronously from another thread, which allows faster multithreaded decoding. * draw_horiz_band() will be called from other threads regardless of this setting. * Ignored if the default get_buffer() is used. * - encoding: Set by user. * - decoding: Set by user. */ int thread_safe_callbacks; /** * The codec may call this to execute several independent things. * It will return only after finishing all tasks. * The user may replace this with some multithreaded implementation, * the default implementation will execute the parts serially. * @param count the number of things to execute * - encoding: Set by libavcodec, user can override. * - decoding: Set by libavcodec, user can override. */ int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size); /** * The codec may call this to execute several independent things. * It will return only after finishing all tasks. * The user may replace this with some multithreaded implementation, * the default implementation will execute the parts serially. * Also see avcodec_thread_init and e.g. the --enable-pthread configure option. * @param c context passed also to func * @param count the number of things to execute * @param arg2 argument passed unchanged to func * @param ret return values of executed functions, must have space for "count" values. May be NULL. * @param func function that will be called count times, with jobnr from 0 to count-1. * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no * two instances of func executing at the same time will have the same threadnr. * @return always 0 currently, but code should handle a future improvement where when any call to func * returns < 0 no further calls to func may be done and < 0 is returned. * - encoding: Set by libavcodec, user can override. * - decoding: Set by libavcodec, user can override. */ int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count); #if FF_API_THREAD_OPAQUE /** * @deprecated this field should not be used from outside of lavc */ attribute_deprecated void *thread_opaque; #endif /** * noise vs. sse weight for the nsse comparison function * - encoding: Set by user. * - decoding: unused */ int nsse_weight; /** * profile * - encoding: Set by user. * - decoding: Set by libavcodec. */ int profile; #define FF_PROFILE_UNKNOWN -99 #define FF_PROFILE_RESERVED -100 #define FF_PROFILE_AAC_MAIN 0 #define FF_PROFILE_AAC_LOW 1 #define FF_PROFILE_AAC_SSR 2 #define FF_PROFILE_AAC_LTP 3 #define FF_PROFILE_AAC_HE 4 #define FF_PROFILE_AAC_HE_V2 28 #define FF_PROFILE_AAC_LD 22 #define FF_PROFILE_AAC_ELD 38 #define FF_PROFILE_MPEG2_AAC_LOW 128 #define FF_PROFILE_MPEG2_AAC_HE 131 #define FF_PROFILE_DTS 20 #define FF_PROFILE_DTS_ES 30 #define FF_PROFILE_DTS_96_24 40 #define FF_PROFILE_DTS_HD_HRA 50 #define FF_PROFILE_DTS_HD_MA 60 #define FF_PROFILE_MPEG2_422 0 #define FF_PROFILE_MPEG2_HIGH 1 #define FF_PROFILE_MPEG2_SS 2 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3 #define FF_PROFILE_MPEG2_MAIN 4 #define FF_PROFILE_MPEG2_SIMPLE 5 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag #define FF_PROFILE_H264_BASELINE 66 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED) #define FF_PROFILE_H264_MAIN 77 #define FF_PROFILE_H264_EXTENDED 88 #define FF_PROFILE_H264_HIGH 100 #define FF_PROFILE_H264_HIGH_10 110 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA) #define FF_PROFILE_H264_HIGH_422 122 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA) #define FF_PROFILE_H264_HIGH_444 144 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA) #define FF_PROFILE_H264_CAVLC_444 44 #define FF_PROFILE_VC1_SIMPLE 0 #define FF_PROFILE_VC1_MAIN 1 #define FF_PROFILE_VC1_COMPLEX 2 #define FF_PROFILE_VC1_ADVANCED 3 #define FF_PROFILE_MPEG4_SIMPLE 0 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1 #define FF_PROFILE_MPEG4_CORE 2 #define FF_PROFILE_MPEG4_MAIN 3 #define FF_PROFILE_MPEG4_N_BIT 4 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7 #define FF_PROFILE_MPEG4_HYBRID 8 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4 #define FF_PROFILE_HEVC_MAIN 1 #define FF_PROFILE_HEVC_MAIN_10 2 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3 #define FF_PROFILE_HEVC_REXT 4 /** * level * - encoding: Set by user. * - decoding: Set by libavcodec. */ int level; #define FF_LEVEL_UNKNOWN -99 /** * Skip loop filtering for selected frames. * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_loop_filter; /** * Skip IDCT/dequantization for selected frames. * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_idct; /** * Skip decoding for selected frames. * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_frame; /** * Header containing style information for text subtitles. * For SUBTITLE_ASS subtitle type, it should contain the whole ASS * [Script Info] and [V4+ Styles] section, plus the [Events] line and * the Format line following. It shouldn't include any Dialogue line. * - encoding: Set/allocated/freed by user (before avcodec_open2()) * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2()) */ uint8_t *subtitle_header; int subtitle_header_size; #if FF_API_ERROR_RATE /** * @deprecated use the 'error_rate' private AVOption of the mpegvideo * encoders */ attribute_deprecated int error_rate; #endif #if FF_API_CODEC_PKT /** * @deprecated this field is not supposed to be accessed from outside lavc */ attribute_deprecated AVPacket *pkt; #endif /** * VBV delay coded in the last frame (in periods of a 27 MHz clock). * Used for compliant TS muxing. * - encoding: Set by libavcodec. * - decoding: unused. */ uint64_t vbv_delay; /** * Encoding only. Allow encoders to output packets that do not contain any * encoded data, only side data. * * Some encoders need to output such packets, e.g. to update some stream * parameters at the end of encoding. * * All callers are strongly recommended to set this option to 1 and update * their code to deal with such packets, since this behaviour may become * always enabled in the future (then this option will be deprecated and * later removed). To avoid ABI issues when this happens, the callers should * use AVOptions to set this field. */ int side_data_only_packets; /** * Timebase in which pkt_dts/pts and AVPacket.dts/pts are. * Code outside libavcodec should access this field using: * av_codec_{get,set}_pkt_timebase(avctx) * - encoding unused. * - decoding set by user. */ AVRational pkt_timebase; /** * AVCodecDescriptor * Code outside libavcodec should access this field using: * av_codec_{get,set}_codec_descriptor(avctx) * - encoding: unused. * - decoding: set by libavcodec. */ const AVCodecDescriptor *codec_descriptor; #if !FF_API_LOWRES /** * low resolution decoding, 1-> 1/2 size, 2->1/4 size * - encoding: unused * - decoding: Set by user. * Code outside libavcodec should access this field using: * av_codec_{get,set}_lowres(avctx) */ int lowres; #endif /** * Current statistics for PTS correction. * - decoding: maintained and used by libavcodec, not intended to be used by user apps * - encoding: unused */ int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far int64_t pts_correction_last_pts; /// PTS of the last frame int64_t pts_correction_last_dts; /// DTS of the last frame /** * Character encoding of the input subtitles file. * - decoding: set by user * - encoding: unused */ char *sub_charenc; /** * Subtitles character encoding mode. Formats or codecs might be adjusting * this setting (if they are doing the conversion themselves for instance). * - decoding: set by libavcodec * - encoding: unused */ int sub_charenc_mode; #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance) #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv /** * Skip processing alpha if supported by codec. * Note that if the format uses pre-multiplied alpha (common with VP6, * and recommended due to better video quality/compression) * the image will look as if alpha-blended onto a black background. * However for formats that do not use pre-multiplied alpha * there might be serious artefacts (though e.g. libswscale currently * assumes pre-multiplied alpha anyway). * Code outside libavcodec should access this field using AVOptions * * - decoding: set by user * - encoding: unused */ int skip_alpha; /** * Number of samples to skip after a discontinuity * - decoding: unused * - encoding: set by libavcodec */ int seek_preroll; #if !FF_API_DEBUG_MV /** * debug motion vectors * Code outside libavcodec should access this field using AVOptions * - encoding: Set by user. * - decoding: Set by user. */ int debug_mv; #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames #endif /** * custom intra quantization matrix * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix() * - encoding: Set by user, can be NULL. * - decoding: unused. */ uint16_t *chroma_intra_matrix; } AVCodecContext; AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx); void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val); const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx); void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc); int av_codec_get_lowres(const AVCodecContext *avctx); void av_codec_set_lowres(AVCodecContext *avctx, int val); int av_codec_get_seek_preroll(const AVCodecContext *avctx); void av_codec_set_seek_preroll(AVCodecContext *avctx, int val); uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx); void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val); /** * AVProfile. */ typedef struct AVProfile { int profile; const char *name; ///< short name for the profile } AVProfile; typedef struct AVCodecDefault AVCodecDefault; struct AVSubtitle; /** * AVCodec. */ typedef struct AVCodec { /** * Name of the codec implementation. * The name is globally unique among encoders and among decoders (but an * encoder and a decoder can share the same name). * This is the primary way to find a codec from the user perspective. */ const char *name; /** * Descriptive name for the codec, meant to be more human readable than name. * You should use the NULL_IF_CONFIG_SMALL() macro to define it. */ const char *long_name; enum AVMediaType type; enum AVCodecID id; /** * Codec capabilities. * see CODEC_CAP_* */ int capabilities; const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0} const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0 #if FF_API_LOWRES uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres() #endif const AVClass *priv_class; ///< AVClass for the private context const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} /***************************************************************** * No fields below this line are part of the public API. They * may not be used outside of libavcodec and can be changed and * removed at will. * New public fields should be added right above. ***************************************************************** */ int priv_data_size; struct AVCodec *next; /** * @name Frame-level threading support functions * @{ */ /** * If defined, called on thread contexts when they are created. * If the codec allocates writable tables in init(), re-allocate them here. * priv_data will be set to a copy of the original. */ int (*init_thread_copy)(AVCodecContext *); /** * Copy necessary context variables from a previous thread context to the current one. * If not defined, the next thread will start automatically; otherwise, the codec * must call ff_thread_finish_setup(). * * dst and src will (rarely) point to the same context, in which case memcpy should be skipped. */ int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src); /** @} */ /** * Private codec-specific defaults. */ const AVCodecDefault *defaults; /** * Initialize codec static data, called from avcodec_register(). */ void (*init_static_data)(struct AVCodec *codec); int (*init)(AVCodecContext *); int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size, const struct AVSubtitle *sub); /** * Encode data to an AVPacket. * * @param avctx codec context * @param avpkt output AVPacket (may contain a user-provided buffer) * @param[in] frame AVFrame containing the raw data to be encoded * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a * non-empty packet was returned in avpkt. * @return 0 on success, negative error code on failure */ int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr); int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt); int (*close)(AVCodecContext *); /** * Flush buffers. * Will be called when seeking */ void (*flush)(AVCodecContext *); } AVCodec; int av_codec_get_max_lowres(const AVCodec *codec); struct MpegEncContext; /** * AVHWAccel. */ typedef struct AVHWAccel { /** * Name of the hardware accelerated codec. * The name is globally unique among encoders and among decoders (but an * encoder and a decoder can share the same name). */ const char *name; /** * Type of codec implemented by the hardware accelerator. * * See AVMEDIA_TYPE_xxx */ enum AVMediaType type; /** * Codec implemented by the hardware accelerator. * * See AV_CODEC_ID_xxx */ enum AVCodecID id; /** * Supported pixel format. * * Only hardware accelerated formats are supported here. */ enum AVPixelFormat pix_fmt; /** * Hardware accelerated codec capabilities. * see FF_HWACCEL_CODEC_CAP_* */ int capabilities; /***************************************************************** * No fields below this line are part of the public API. They * may not be used outside of libavcodec and can be changed and * removed at will. * New public fields should be added right above. ***************************************************************** */ struct AVHWAccel *next; /** * Allocate a custom buffer */ int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame); /** * Called at the beginning of each frame or field picture. * * Meaningful frame information (codec specific) is guaranteed to * be parsed at this point. This function is mandatory. * * Note that buf can be NULL along with buf_size set to 0. * Otherwise, this means the whole frame is available at this point. * * @param avctx the codec context * @param buf the frame data buffer base * @param buf_size the size of the frame in bytes * @return zero if successful, a negative value otherwise */ int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); /** * Callback for each slice. * * Meaningful slice information (codec specific) is guaranteed to * be parsed at this point. This function is mandatory. * The only exception is XvMC, that works on MB level. * * @param avctx the codec context * @param buf the slice data buffer base * @param buf_size the size of the slice in bytes * @return zero if successful, a negative value otherwise */ int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); /** * Called at the end of each frame or field picture. * * The whole picture is parsed at this point and can now be sent * to the hardware accelerator. This function is mandatory. * * @param avctx the codec context * @return zero if successful, a negative value otherwise */ int (*end_frame)(AVCodecContext *avctx); /** * Size of per-frame hardware accelerator private data. * * Private data is allocated with av_mallocz() before * AVCodecContext.get_buffer() and deallocated after * AVCodecContext.release_buffer(). */ int frame_priv_data_size; /** * Called for every Macroblock in a slice. * * XvMC uses it to replace the ff_MPV_decode_mb(). * Instead of decoding to raw picture, MB parameters are * stored in an array provided by the video driver. * * @param s the mpeg context */ void (*decode_mb)(struct MpegEncContext *s); /** * Initialize the hwaccel private data. * * This will be called from ff_get_format(), after hwaccel and * hwaccel_context are set and the hwaccel private data in AVCodecInternal * is allocated. */ int (*init)(AVCodecContext *avctx); /** * Uninitialize the hwaccel private data. * * This will be called from get_format() or avcodec_close(), after hwaccel * and hwaccel_context are already uninitialized. */ int (*uninit)(AVCodecContext *avctx); /** * Size of the private data to allocate in * AVCodecInternal.hwaccel_priv_data. */ int priv_data_size; } AVHWAccel; /** * @defgroup lavc_picture AVPicture * * Functions for working with AVPicture * @{ */ /** * Picture data structure. * * Up to four components can be stored into it, the last component is * alpha. */ typedef struct AVPicture { uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line } AVPicture; /** * @} */ enum AVSubtitleType { SUBTITLE_NONE, SUBTITLE_BITMAP, ///< A bitmap, pict will be set /** * Plain text, the text field must be set by the decoder and is * authoritative. ass and pict fields may contain approximations. */ SUBTITLE_TEXT, /** * Formatted text, the ass field must be set by the decoder and is * authoritative. pict and text fields may contain approximations. */ SUBTITLE_ASS, }; #define AV_SUBTITLE_FLAG_FORCED 0x00000001 typedef struct AVSubtitleRect { int x; ///< top left corner of pict, undefined when pict is not set int y; ///< top left corner of pict, undefined when pict is not set int w; ///< width of pict, undefined when pict is not set int h; ///< height of pict, undefined when pict is not set int nb_colors; ///< number of colors in pict, undefined when pict is not set /** * data+linesize for the bitmap of this subtitle. * can be set for text/ass as well once they where rendered */ AVPicture pict; enum AVSubtitleType type; char *text; ///< 0 terminated plain UTF-8 text /** * 0 terminated ASS/SSA compatible event line. * The presentation of this is unaffected by the other values in this * struct. */ char *ass; int flags; } AVSubtitleRect; typedef struct AVSubtitle { uint16_t format; /* 0 = graphics */ uint32_t start_display_time; /* relative to packet pts, in ms */ uint32_t end_display_time; /* relative to packet pts, in ms */ unsigned num_rects; AVSubtitleRect **rects; int64_t pts; ///< Same as packet pts, in AV_TIME_BASE } AVSubtitle; /** * If c is NULL, returns the first registered codec, * if c is non-NULL, returns the next registered codec after c, * or NULL if c is the last one. */ AVCodec *av_codec_next(const AVCodec *c); /** * Return the LIBAVCODEC_VERSION_INT constant. */ unsigned avcodec_version(void); /** * Return the libavcodec build-time configuration. */ const char *avcodec_configuration(void); /** * Return the libavcodec license. */ const char *avcodec_license(void); /** * Register the codec codec and initialize libavcodec. * * @warning either this function or avcodec_register_all() must be called * before any other libavcodec functions. * * @see avcodec_register_all() */ void avcodec_register(AVCodec *codec); /** * Register all the codecs, parsers and bitstream filters which were enabled at * configuration time. If you do not call this function you can select exactly * which formats you want to support, by using the individual registration * functions. * * @see avcodec_register * @see av_register_codec_parser * @see av_register_bitstream_filter */ void avcodec_register_all(void); /** * Allocate an AVCodecContext and set its fields to default values. The * resulting struct should be freed with avcodec_free_context(). * * @param codec if non-NULL, allocate private data and initialize defaults * for the given codec. It is illegal to then call avcodec_open2() * with a different codec. * If NULL, then the codec-specific defaults won't be initialized, * which may result in suboptimal default settings (this is * important mainly for encoders, e.g. libx264). * * @return An AVCodecContext filled with default values or NULL on failure. * @see avcodec_get_context_defaults */ AVCodecContext *avcodec_alloc_context3(const AVCodec *codec); /** * Free the codec context and everything associated with it and write NULL to * the provided pointer. */ void avcodec_free_context(AVCodecContext **avctx); /** * Set the fields of the given AVCodecContext to default values corresponding * to the given codec (defaults may be codec-dependent). * * Do not call this function if a non-NULL codec has been passed * to avcodec_alloc_context3() that allocated this AVCodecContext. * If codec is non-NULL, it is illegal to call avcodec_open2() with a * different codec on this AVCodecContext. */ int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec); /** * Get the AVClass for AVCodecContext. It can be used in combination with * AV_OPT_SEARCH_FAKE_OBJ for examining options. * * @see av_opt_find(). */ const AVClass *avcodec_get_class(void); /** * Get the AVClass for AVFrame. It can be used in combination with * AV_OPT_SEARCH_FAKE_OBJ for examining options. * * @see av_opt_find(). */ const AVClass *avcodec_get_frame_class(void); /** * Get the AVClass for AVSubtitleRect. It can be used in combination with * AV_OPT_SEARCH_FAKE_OBJ for examining options. * * @see av_opt_find(). */ const AVClass *avcodec_get_subtitle_rect_class(void); /** * Copy the settings of the source AVCodecContext into the destination * AVCodecContext. The resulting destination codec context will be * unopened, i.e. you are required to call avcodec_open2() before you * can use this AVCodecContext to decode/encode video/audio data. * * @param dest target codec context, should be initialized with * avcodec_alloc_context3(NULL), but otherwise uninitialized * @param src source codec context * @return AVERROR() on error (e.g. memory allocation error), 0 on success */ int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src); #if FF_API_AVFRAME_LAVC /** * @deprecated use av_frame_alloc() */ attribute_deprecated AVFrame *avcodec_alloc_frame(void); /** * Set the fields of the given AVFrame to default values. * * @param frame The AVFrame of which the fields should be set to default values. * * @deprecated use av_frame_unref() */ attribute_deprecated void avcodec_get_frame_defaults(AVFrame *frame); /** * Free the frame and any dynamically allocated objects in it, * e.g. extended_data. * * @param frame frame to be freed. The pointer will be set to NULL. * * @warning this function does NOT free the data buffers themselves * (it does not know how, since they might have been allocated with * a custom get_buffer()). * * @deprecated use av_frame_free() */ attribute_deprecated void avcodec_free_frame(AVFrame **frame); #endif /** * Initialize the AVCodecContext to use the given AVCodec. Prior to using this * function the context has to be allocated with avcodec_alloc_context3(). * * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for * retrieving a codec. * * @warning This function is not thread safe! * * @code * avcodec_register_all(); * av_dict_set(&opts, "b", "2.5M", 0); * codec = avcodec_find_decoder(AV_CODEC_ID_H264); * if (!codec) * exit(1); * * context = avcodec_alloc_context3(codec); * * if (avcodec_open2(context, codec, opts) < 0) * exit(1); * @endcode * * @param avctx The context to initialize. * @param codec The codec to open this context for. If a non-NULL codec has been * previously passed to avcodec_alloc_context3() or * avcodec_get_context_defaults3() for this context, then this * parameter MUST be either NULL or equal to the previously passed * codec. * @param options A dictionary filled with AVCodecContext and codec-private options. * On return this object will be filled with options that were not found. * * @return zero on success, a negative value on error * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(), * av_dict_set(), av_opt_find(). */ int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options); /** * Close a given AVCodecContext and free all the data associated with it * (but not the AVCodecContext itself). * * Calling this function on an AVCodecContext that hasn't been opened will free * the codec-specific data allocated in avcodec_alloc_context3() / * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will * do nothing. */ int avcodec_close(AVCodecContext *avctx); /** * Free all allocated data in the given subtitle struct. * * @param sub AVSubtitle to free. */ void avsubtitle_free(AVSubtitle *sub); /** * @} */ /** * @addtogroup lavc_packet * @{ */ #if FF_API_DESTRUCT_PACKET /** * Default packet destructor. * @deprecated use the AVBuffer API instead */ attribute_deprecated void av_destruct_packet(AVPacket *pkt); #endif /** * Initialize optional fields of a packet with default values. * * Note, this does not touch the data and size members, which have to be * initialized separately. * * @param pkt packet */ void av_init_packet(AVPacket *pkt); /** * Allocate the payload of a packet and initialize its fields with * default values. * * @param pkt packet * @param size wanted payload size * @return 0 if OK, AVERROR_xxx otherwise */ int av_new_packet(AVPacket *pkt, int size); /** * Reduce packet size, correctly zeroing padding * * @param pkt packet * @param size new size */ void av_shrink_packet(AVPacket *pkt, int size); /** * Increase packet size, correctly zeroing padding * * @param pkt packet * @param grow_by number of bytes by which to increase the size of the packet */ int av_grow_packet(AVPacket *pkt, int grow_by); /** * Initialize a reference-counted packet from av_malloc()ed data. * * @param pkt packet to be initialized. This function will set the data, size, * buf and destruct fields, all others are left untouched. * @param data Data allocated by av_malloc() to be used as packet data. If this * function returns successfully, the data is owned by the underlying AVBuffer. * The caller may not access the data through other means. * @param size size of data in bytes, without the padding. I.e. the full buffer * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE. * * @return 0 on success, a negative AVERROR on error */ int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size); /** * @warning This is a hack - the packet memory allocation stuff is broken. The * packet is allocated if it was not really allocated. */ int av_dup_packet(AVPacket *pkt); /** * Copy packet, including contents * * @return 0 on success, negative AVERROR on fail */ int av_copy_packet(AVPacket *dst, const AVPacket *src); /** * Copy packet side data * * @return 0 on success, negative AVERROR on fail */ int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src); /** * Free a packet. * * @param pkt packet to free */ void av_free_packet(AVPacket *pkt); /** * Allocate new information of a packet. * * @param pkt packet * @param type side information type * @param size side information size * @return pointer to fresh allocated data or NULL otherwise */ uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size); /** * Shrink the already allocated side data buffer * * @param pkt packet * @param type side information type * @param size new side information size * @return 0 on success, < 0 on failure */ int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size); /** * Get side information from packet. * * @param pkt packet * @param type desired side information type * @param size pointer for side information size to store (optional) * @return pointer to data if present or NULL otherwise */ uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size); int av_packet_merge_side_data(AVPacket *pkt); int av_packet_split_side_data(AVPacket *pkt); /** * Pack a dictionary for use in side_data. * * @param dict The dictionary to pack. * @param size pointer to store the size of the returned data * @return pointer to data if successful, NULL otherwise */ uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size); /** * Unpack a dictionary from side_data. * * @param data data from side_data * @param size size of the data * @param dict the metadata storage dictionary * @return 0 on success, < 0 on failure */ int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict); /** * Convenience function to free all the side data stored. * All the other fields stay untouched. * * @param pkt packet */ void av_packet_free_side_data(AVPacket *pkt); /** * Setup a new reference to the data described by a given packet * * If src is reference-counted, setup dst as a new reference to the * buffer in src. Otherwise allocate a new buffer in dst and copy the * data from src into it. * * All the other fields are copied from src. * * @see av_packet_unref * * @param dst Destination packet * @param src Source packet * * @return 0 on success, a negative AVERROR on error. */ int av_packet_ref(AVPacket *dst, const AVPacket *src); /** * Wipe the packet. * * Unreference the buffer referenced by the packet and reset the * remaining packet fields to their default values. * * @param pkt The packet to be unreferenced. */ void av_packet_unref(AVPacket *pkt); /** * Move every field in src to dst and reset src. * * @see av_packet_unref * * @param src Source packet, will be reset * @param dst Destination packet */ void av_packet_move_ref(AVPacket *dst, AVPacket *src); /** * Copy only "properties" fields from src to dst. * * Properties for the purpose of this function are all the fields * beside those related to the packet data (buf, data, size) * * @param dst Destination packet * @param src Source packet * * @return 0 on success AVERROR on failure. * */ int av_packet_copy_props(AVPacket *dst, const AVPacket *src); /** * Convert valid timing fields (timestamps / durations) in a packet from one * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be * ignored. * * @param pkt packet on which the conversion will be performed * @param tb_src source timebase, in which the timing fields in pkt are * expressed * @param tb_dst destination timebase, to which the timing fields will be * converted */ void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst); /** * @} */ /** * @addtogroup lavc_decoding * @{ */ /** * Find a registered decoder with a matching codec ID. * * @param id AVCodecID of the requested decoder * @return A decoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_decoder(enum AVCodecID id); /** * Find a registered decoder with the specified name. * * @param name name of the requested decoder * @return A decoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_decoder_by_name(const char *name); #if FF_API_GET_BUFFER attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic); attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic); attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic); #endif /** * The default callback for AVCodecContext.get_buffer2(). It is made public so * it can be called by custom get_buffer2() implementations for decoders without * CODEC_CAP_DR1 set. */ int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags); #if FF_API_EMU_EDGE /** * Return the amount of padding in pixels which the get_buffer callback must * provide around the edge of the image for codecs which do not have the * CODEC_FLAG_EMU_EDGE flag. * * @return Required padding in pixels. * * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer * needed */ attribute_deprecated unsigned avcodec_get_edge_width(void); #endif /** * Modify width and height values so that they will result in a memory * buffer that is acceptable for the codec if you do not use any horizontal * padding. * * May only be used if a codec with CODEC_CAP_DR1 has been opened. */ void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height); /** * Modify width and height values so that they will result in a memory * buffer that is acceptable for the codec if you also ensure that all * line sizes are a multiple of the respective linesize_align[i]. * * May only be used if a codec with CODEC_CAP_DR1 has been opened. */ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS]); /** * Converts AVChromaLocation to swscale x/y chroma position. * * The positions represent the chroma (0,0) position in a coordinates system * with luma (0,0) representing the origin and luma(1,1) representing 256,256 * * @param xpos horizontal chroma sample position * @param ypos vertical chroma sample position */ int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos); /** * Converts swscale x/y chroma position to AVChromaLocation. * * The positions represent the chroma (0,0) position in a coordinates system * with luma (0,0) representing the origin and luma(1,1) representing 256,256 * * @param xpos horizontal chroma sample position * @param ypos vertical chroma sample position */ enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos); #if FF_API_OLD_DECODE_AUDIO /** * Wrapper function which calls avcodec_decode_audio4. * * @deprecated Use avcodec_decode_audio4 instead. * * Decode the audio frame of size avpkt->size from avpkt->data into samples. * Some decoders may support multiple frames in a single AVPacket, such * decoders would then just decode the first frame. In this case, * avcodec_decode_audio3 has to be called again with an AVPacket that contains * the remaining data in order to decode the second frame etc. * If no frame * could be outputted, frame_size_ptr is zero. Otherwise, it is the * decompressed frame size in bytes. * * @warning You must set frame_size_ptr to the allocated size of the * output buffer before calling avcodec_decode_audio3(). * * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than * the actual read bytes because some optimized bitstream readers read 32 or 64 * bits at once and could read over the end. * * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that * no overreading happens for damaged MPEG streams. * * @warning You must not provide a custom get_buffer() when using * avcodec_decode_audio3(). Doing so will override it with * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead, * which does allow the application to provide a custom get_buffer(). * * @note You might have to align the input buffer avpkt->data and output buffer * samples. The alignment requirements depend on the CPU: On some CPUs it isn't * necessary at all, on others it won't work at all if not aligned and on others * it will work but it will have an impact on performance. * * In practice, avpkt->data should have 4 byte alignment at minimum and * samples should be 16 byte aligned unless the CPU doesn't need it * (AltiVec and SSE do). * * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay * between input and output, these need to be fed with avpkt->data=NULL, * avpkt->size=0 at the end to return the remaining frames. * * @param avctx the codec context * @param[out] samples the output buffer, sample type in avctx->sample_fmt * If the sample format is planar, each channel plane will * be the same size, with no padding between channels. * @param[in,out] frame_size_ptr the output buffer size in bytes * @param[in] avpkt The input AVPacket containing the input buffer. * You can create such packet with av_init_packet() and by then setting * data and size, some decoders might in addition need other fields. * All decoders are designed to use the least fields possible though. * @return On error a negative value is returned, otherwise the number of bytes * used or zero if no frame data was decompressed (used) from the input AVPacket. */ attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples, int *frame_size_ptr, AVPacket *avpkt); #endif /** * Decode the audio frame of size avpkt->size from avpkt->data into frame. * * Some decoders may support multiple frames in a single AVPacket. Such * decoders would then just decode the first frame and the return value would be * less than the packet size. In this case, avcodec_decode_audio4 has to be * called again with an AVPacket containing the remaining data in order to * decode the second frame, etc... Even if no frames are returned, the packet * needs to be fed to the decoder with remaining data until it is completely * consumed or an error occurs. * * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input * and output. This means that for some packets they will not immediately * produce decoded output and need to be flushed at the end of decoding to get * all the decoded data. Flushing is done by calling this function with packets * with avpkt->data set to NULL and avpkt->size set to 0 until it stops * returning samples. It is safe to flush even those decoders that are not * marked with CODEC_CAP_DELAY, then no samples will be returned. * * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE * larger than the actual read bytes because some optimized bitstream * readers read 32 or 64 bits at once and could read over the end. * * @param avctx the codec context * @param[out] frame The AVFrame in which to store decoded audio samples. * The decoder will allocate a buffer for the decoded frame by * calling the AVCodecContext.get_buffer2() callback. * When AVCodecContext.refcounted_frames is set to 1, the frame is * reference counted and the returned reference belongs to the * caller. The caller must release the frame using av_frame_unref() * when the frame is no longer needed. The caller may safely write * to the frame if av_frame_is_writable() returns 1. * When AVCodecContext.refcounted_frames is set to 0, the returned * reference belongs to the decoder and is valid only until the * next call to this function or until closing or flushing the * decoder. The caller may not write to it. * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is * non-zero. Note that this field being set to zero * does not mean that an error has occurred. For * decoders with CODEC_CAP_DELAY set, no given decode * call is guaranteed to produce a frame. * @param[in] avpkt The input AVPacket containing the input buffer. * At least avpkt->data and avpkt->size should be set. Some * decoders might also require additional fields to be set. * @return A negative error code is returned if an error occurred during * decoding, otherwise the number of bytes consumed from the input * AVPacket is returned. */ int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt); /** * Decode the video frame of size avpkt->size from avpkt->data into picture. * Some decoders may support multiple frames in a single AVPacket, such * decoders would then just decode the first frame. * * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than * the actual read bytes because some optimized bitstream readers read 32 or 64 * bits at once and could read over the end. * * @warning The end of the input buffer buf should be set to 0 to ensure that * no overreading happens for damaged MPEG streams. * * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay * between input and output, these need to be fed with avpkt->data=NULL, * avpkt->size=0 at the end to return the remaining frames. * * @param avctx the codec context * @param[out] picture The AVFrame in which the decoded video frame will be stored. * Use av_frame_alloc() to get an AVFrame. The codec will * allocate memory for the actual bitmap by calling the * AVCodecContext.get_buffer2() callback. * When AVCodecContext.refcounted_frames is set to 1, the frame is * reference counted and the returned reference belongs to the * caller. The caller must release the frame using av_frame_unref() * when the frame is no longer needed. The caller may safely write * to the frame if av_frame_is_writable() returns 1. * When AVCodecContext.refcounted_frames is set to 0, the returned * reference belongs to the decoder and is valid only until the * next call to this function or until closing or flushing the * decoder. The caller may not write to it. * * @param[in] avpkt The input AVPacket containing the input buffer. * You can create such packet with av_init_packet() and by then setting * data and size, some decoders might in addition need other fields like * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least * fields possible. * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero. * @return On error a negative value is returned, otherwise the number of bytes * used or zero if no frame could be decompressed. */ int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt); /** * Decode a subtitle message. * Return a negative value on error, otherwise return the number of bytes used. * If no subtitle could be decompressed, got_sub_ptr is zero. * Otherwise, the subtitle is stored in *sub. * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for * simplicity, because the performance difference is expect to be negligible * and reusing a get_buffer written for video codecs would probably perform badly * due to a potentially very different allocation pattern. * * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input * and output. This means that for some packets they will not immediately * produce decoded output and need to be flushed at the end of decoding to get * all the decoded data. Flushing is done by calling this function with packets * with avpkt->data set to NULL and avpkt->size set to 0 until it stops * returning subtitles. It is safe to flush even those decoders that are not * marked with CODEC_CAP_DELAY, then no subtitles will be returned. * * @param avctx the codec context * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored, * must be freed with avsubtitle_free if *got_sub_ptr is set. * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero. * @param[in] avpkt The input AVPacket containing the input buffer. */ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt); /** * @defgroup lavc_parsing Frame parsing * @{ */ enum AVPictureStructure { AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field AV_PICTURE_STRUCTURE_FRAME, //< coded as frame }; typedef struct AVCodecParserContext { void *priv_data; struct AVCodecParser *parser; int64_t frame_offset; /* offset of the current frame */ int64_t cur_offset; /* current offset (incremented by each av_parser_parse()) */ int64_t next_frame_offset; /* offset of the next frame */ /* video info */ int pict_type; /* XXX: Put it back in AVCodecContext. */ /** * This field is used for proper frame duration computation in lavf. * It signals, how much longer the frame duration of the current frame * is compared to normal frame duration. * * frame_duration = (1 + repeat_pict) * time_base * * It is used by codecs like H.264 to display telecined material. */ int repeat_pict; /* XXX: Put it back in AVCodecContext. */ int64_t pts; /* pts of the current frame */ int64_t dts; /* dts of the current frame */ /* private data */ int64_t last_pts; int64_t last_dts; int fetch_timestamp; #define AV_PARSER_PTS_NB 4 int cur_frame_start_index; int64_t cur_frame_offset[AV_PARSER_PTS_NB]; int64_t cur_frame_pts[AV_PARSER_PTS_NB]; int64_t cur_frame_dts[AV_PARSER_PTS_NB]; int flags; #define PARSER_FLAG_COMPLETE_FRAMES 0x0001 #define PARSER_FLAG_ONCE 0x0002 /// Set if the parser has a valid file offset #define PARSER_FLAG_FETCHED_OFFSET 0x0004 #define PARSER_FLAG_USE_CODEC_TS 0x1000 int64_t offset; ///< byte offset from starting packet start int64_t cur_frame_end[AV_PARSER_PTS_NB]; /** * Set by parser to 1 for key frames and 0 for non-key frames. * It is initialized to -1, so if the parser doesn't set this flag, * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames * will be used. */ int key_frame; /** * Time difference in stream time base units from the pts of this * packet to the point at which the output from the decoder has converged * independent from the availability of previous frames. That is, the * frames are virtually identical no matter if decoding started from * the very first frame or from this keyframe. * Is AV_NOPTS_VALUE if unknown. * This field is not the display duration of the current frame. * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY * set. * * The purpose of this field is to allow seeking in streams that have no * keyframes in the conventional sense. It corresponds to the * recovery point SEI in H.264 and match_time_delta in NUT. It is also * essential for some types of subtitle streams to ensure that all * subtitles are correctly displayed after seeking. */ int64_t convergence_duration; // Timestamp generation support: /** * Synchronization point for start of timestamp generation. * * Set to >0 for sync point, 0 for no sync point and <0 for undefined * (default). * * For example, this corresponds to presence of H.264 buffering period * SEI message. */ int dts_sync_point; /** * Offset of the current timestamp against last timestamp sync point in * units of AVCodecContext.time_base. * * Set to INT_MIN when dts_sync_point unused. Otherwise, it must * contain a valid timestamp offset. * * Note that the timestamp of sync point has usually a nonzero * dts_ref_dts_delta, which refers to the previous sync point. Offset of * the next frame after timestamp sync point will be usually 1. * * For example, this corresponds to H.264 cpb_removal_delay. */ int dts_ref_dts_delta; /** * Presentation delay of current frame in units of AVCodecContext.time_base. * * Set to INT_MIN when dts_sync_point unused. Otherwise, it must * contain valid non-negative timestamp delta (presentation time of a frame * must not lie in the past). * * This delay represents the difference between decoding and presentation * time of the frame. * * For example, this corresponds to H.264 dpb_output_delay. */ int pts_dts_delta; /** * Position of the packet in file. * * Analogous to cur_frame_pts/dts */ int64_t cur_frame_pos[AV_PARSER_PTS_NB]; /** * Byte position of currently parsed frame in stream. */ int64_t pos; /** * Previous frame byte position. */ int64_t last_pos; /** * Duration of the current frame. * For audio, this is in units of 1 / AVCodecContext.sample_rate. * For all other types, this is in units of AVCodecContext.time_base. */ int duration; enum AVFieldOrder field_order; /** * Indicate whether a picture is coded as a frame, top field or bottom field. * * For example, H.264 field_pic_flag equal to 0 corresponds to * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag * equal to 1 and bottom_field_flag equal to 0 corresponds to * AV_PICTURE_STRUCTURE_TOP_FIELD. */ enum AVPictureStructure picture_structure; /** * Picture number incremented in presentation or output order. * This field may be reinitialized at the first picture of a new sequence. * * For example, this corresponds to H.264 PicOrderCnt. */ int output_picture_number; } AVCodecParserContext; typedef struct AVCodecParser { int codec_ids[5]; /* several codec IDs are permitted */ int priv_data_size; int (*parser_init)(AVCodecParserContext *s); int (*parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size); void (*parser_close)(AVCodecParserContext *s); int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size); struct AVCodecParser *next; } AVCodecParser; AVCodecParser *av_parser_next(const AVCodecParser *c); void av_register_codec_parser(AVCodecParser *parser); AVCodecParserContext *av_parser_init(int codec_id); /** * Parse a packet. * * @param s parser context. * @param avctx codec context. * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished. * @param poutbuf_size set to size of parsed buffer or zero if not yet finished. * @param buf input buffer. * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output). * @param pts input presentation timestamp. * @param dts input decoding timestamp. * @param pos input byte position in stream. * @return the number of bytes of the input bitstream used. * * Example: * @code * while(in_len){ * len = av_parser_parse2(myparser, AVCodecContext, &data, &size, * in_data, in_len, * pts, dts, pos); * in_data += len; * in_len -= len; * * if(size) * decode_frame(data, size); * } * @endcode */ int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos); /** * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed * @deprecated use AVBitStreamFilter */ int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe); void av_parser_close(AVCodecParserContext *s); /** * @} * @} */ /** * @addtogroup lavc_encoding * @{ */ /** * Find a registered encoder with a matching codec ID. * * @param id AVCodecID of the requested encoder * @return An encoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_encoder(enum AVCodecID id); /** * Find a registered encoder with the specified name. * * @param name name of the requested encoder * @return An encoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_encoder_by_name(const char *name); #if FF_API_OLD_ENCODE_AUDIO /** * Encode an audio frame from samples into buf. * * @deprecated Use avcodec_encode_audio2 instead. * * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large. * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user * will know how much space is needed because it depends on the value passed * in buf_size as described below. In that case a lower value can be used. * * @param avctx the codec context * @param[out] buf the output buffer * @param[in] buf_size the output buffer size * @param[in] samples the input buffer containing the samples * The number of samples read from this buffer is frame_size*channels, * both of which are defined in avctx. * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of * samples read from samples is equal to: * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id)) * This also implies that av_get_bits_per_sample() must not return 0 for these * codecs. * @return On error a negative value is returned, on success zero or the number * of bytes used to encode the data read from the input buffer. */ int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples); #endif /** * Encode a frame of audio. * * Takes input samples from frame and writes the next output packet, if * available, to avpkt. The output packet does not necessarily contain data for * the most recent frame, as encoders can delay, split, and combine input frames * internally as needed. * * @param avctx codec context * @param avpkt output AVPacket. * The user can supply an output buffer by setting * avpkt->data and avpkt->size prior to calling the * function, but if the size of the user-provided data is not * large enough, encoding will fail. If avpkt->data and * avpkt->size are set, avpkt->destruct must also be set. All * other AVPacket fields will be reset by the encoder using * av_init_packet(). If avpkt->data is NULL, the encoder will * allocate it. The encoder will set avpkt->size to the size * of the output packet. * * If this function fails or produces no output, avpkt will be * freed using av_free_packet() (i.e. avpkt->destruct will be * called to free the user supplied buffer). * @param[in] frame AVFrame containing the raw audio data to be encoded. * May be NULL when flushing an encoder that has the * CODEC_CAP_DELAY capability set. * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame * can have any number of samples. * If it is not set, frame->nb_samples must be equal to * avctx->frame_size for all frames except the last. * The final frame may be smaller than avctx->frame_size. * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the * output packet is non-empty, and to 0 if it is * empty. If the function returns an error, the * packet can be assumed to be invalid, and the * value of got_packet_ptr is undefined and should * not be used. * @return 0 on success, negative error code on failure */ int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr); #if FF_API_OLD_ENCODE_VIDEO /** * @deprecated use avcodec_encode_video2() instead. * * Encode a video frame from pict into buf. * The input picture should be * stored using a specific format, namely avctx.pix_fmt. * * @param avctx the codec context * @param[out] buf the output buffer for the bitstream of encoded frame * @param[in] buf_size the size of the output buffer in bytes * @param[in] pict the input picture to encode * @return On error a negative value is returned, on success zero or the number * of bytes used from the output buffer. */ attribute_deprecated int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVFrame *pict); #endif /** * Encode a frame of video. * * Takes input raw video data from frame and writes the next output packet, if * available, to avpkt. The output packet does not necessarily contain data for * the most recent frame, as encoders can delay and reorder input frames * internally as needed. * * @param avctx codec context * @param avpkt output AVPacket. * The user can supply an output buffer by setting * avpkt->data and avpkt->size prior to calling the * function, but if the size of the user-provided data is not * large enough, encoding will fail. All other AVPacket fields * will be reset by the encoder using av_init_packet(). If * avpkt->data is NULL, the encoder will allocate it. * The encoder will set avpkt->size to the size of the * output packet. The returned data (if any) belongs to the * caller, he is responsible for freeing it. * * If this function fails or produces no output, avpkt will be * freed using av_free_packet() (i.e. avpkt->destruct will be * called to free the user supplied buffer). * @param[in] frame AVFrame containing the raw video data to be encoded. * May be NULL when flushing an encoder that has the * CODEC_CAP_DELAY capability set. * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the * output packet is non-empty, and to 0 if it is * empty. If the function returns an error, the * packet can be assumed to be invalid, and the * value of got_packet_ptr is undefined and should * not be used. * @return 0 on success, negative error code on failure */ int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr); int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub); /** * @} */ #if FF_API_AVCODEC_RESAMPLE /** * @defgroup lavc_resample Audio resampling * @ingroup libavc * @deprecated use libswresample instead * * @{ */ struct ReSampleContext; struct AVResampleContext; typedef struct ReSampleContext ReSampleContext; /** * Initialize audio resampling context. * * @param output_channels number of output channels * @param input_channels number of input channels * @param output_rate output sample rate * @param input_rate input sample rate * @param sample_fmt_out requested output sample format * @param sample_fmt_in input sample format * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency * @param log2_phase_count log2 of the number of entries in the polyphase filterbank * @param linear if 1 then the used FIR filter will be linearly interpolated between the 2 closest, if 0 the closest will be used * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate * @return allocated ReSampleContext, NULL if error occurred */ attribute_deprecated ReSampleContext *av_audio_resample_init(int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, enum AVSampleFormat sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff); attribute_deprecated int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples); /** * Free resample context. * * @param s a non-NULL pointer to a resample context previously * created with av_audio_resample_init() */ attribute_deprecated void audio_resample_close(ReSampleContext *s); /** * Initialize an audio resampler. * Note, if either rate is not an integer then simply scale both rates up so they are. * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq * @param log2_phase_count log2 of the number of entries in the polyphase filterbank * @param linear If 1 then the used FIR filter will be linearly interpolated between the 2 closest, if 0 the closest will be used * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate */ attribute_deprecated struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff); /** * Resample an array of samples using a previously configured context. * @param src an array of unconsumed samples * @param consumed the number of samples of src which have been consumed are returned here * @param src_size the number of unconsumed samples available * @param dst_size the amount of space in samples available in dst * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context. * @return the number of samples written in dst or -1 if an error occurred */ attribute_deprecated int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx); /** * Compensate samplerate/timestamp drift. The compensation is done by changing * the resampler parameters, so no audible clicks or similar distortions occur * @param compensation_distance distance in output samples over which the compensation should be performed * @param sample_delta number of output samples which should be output less * * example: av_resample_compensate(c, 10, 500) * here instead of 510 samples only 500 samples would be output * * note, due to rounding the actual compensation might be slightly different, * especially if the compensation_distance is large and the in_rate used during init is small */ attribute_deprecated void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance); attribute_deprecated void av_resample_close(struct AVResampleContext *c); /** * @} */ #endif /** * @addtogroup lavc_picture * @{ */ /** * Allocate memory for the pixels of a picture and setup the AVPicture * fields for it. * * Call avpicture_free() to free it. * * @param picture the picture structure to be filled in * @param pix_fmt the pixel format of the picture * @param width the width of the picture * @param height the height of the picture * @return zero if successful, a negative error code otherwise * * @see av_image_alloc(), avpicture_fill() */ int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height); /** * Free a picture previously allocated by avpicture_alloc(). * The data buffer used by the AVPicture is freed, but the AVPicture structure * itself is not. * * @param picture the AVPicture to be freed */ void avpicture_free(AVPicture *picture); /** * Setup the picture fields based on the specified image parameters * and the provided image data buffer. * * The picture fields are filled in by using the image data buffer * pointed to by ptr. * * If ptr is NULL, the function will fill only the picture linesize * array and return the required size for the image buffer. * * To allocate an image buffer and fill the picture data in one call, * use avpicture_alloc(). * * @param picture the picture to be filled in * @param ptr buffer where the image data is stored, or NULL * @param pix_fmt the pixel format of the image * @param width the width of the image in pixels * @param height the height of the image in pixels * @return the size in bytes required for src, a negative error code * in case of failure * * @see av_image_fill_arrays() */ int avpicture_fill(AVPicture *picture, const uint8_t *ptr, enum AVPixelFormat pix_fmt, int width, int height); /** * Copy pixel data from an AVPicture into a buffer. * * avpicture_get_size() can be used to compute the required size for * the buffer to fill. * * @param src source picture with filled data * @param pix_fmt picture pixel format * @param width picture width * @param height picture height * @param dest destination buffer * @param dest_size destination buffer size in bytes * @return the number of bytes written to dest, or a negative value * (error code) on error, for example if the destination buffer is not * big enough * * @see av_image_copy_to_buffer() */ int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size); /** * Calculate the size in bytes that a picture of the given width and height * would occupy if stored in the given picture format. * * @param pix_fmt picture pixel format * @param width picture width * @param height picture height * @return the computed picture buffer size or a negative error code * in case of error * * @see av_image_get_buffer_size(). */ int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height); #if FF_API_DEINTERLACE /** * deinterlace - if not supported return -1 * * @deprecated - use yadif (in libavfilter) instead */ attribute_deprecated int avpicture_deinterlace(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height); #endif /** * Copy image src to dst. Wraps av_image_copy(). */ void av_picture_copy(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height); /** * Crop image top and left side. */ int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band); /** * Pad image. */ int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color); /** * @} */ /** * @defgroup lavc_misc Utility functions * @ingroup libavc * * Miscellaneous utility functions related to both encoding and decoding * (or neither). * @{ */ /** * @defgroup lavc_misc_pixfmt Pixel formats * * Functions for working with pixel formats. * @{ */ /** * Utility function to access log2_chroma_w log2_chroma_h from * the pixel format AVPixFmtDescriptor. * * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample * for one that returns a failure code and continues in case of invalid * pix_fmts. * * @param[in] pix_fmt the pixel format * @param[out] h_shift store log2_chroma_w * @param[out] v_shift store log2_chroma_h * * @see av_pix_fmt_get_chroma_sub_sample */ void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift); /** * Return a value representing the fourCC code associated to the * pixel format pix_fmt, or 0 if no associated fourCC code can be * found. */ unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt); /** * @deprecated see av_get_pix_fmt_loss() */ int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha); /** * Find the best pixel format to convert to given a certain source pixel * format. When converting from one pixel format to another, information loss * may occur. For example, when converting from RGB24 to GRAY, the color * information will be lost. Similarly, other losses occur when converting from * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of * the given pixel formats should be used to suffer the least amount of loss. * The pixel formats from which it chooses one, are determined by the * pix_fmt_list parameter. * * * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from * @param[in] src_pix_fmt source pixel format * @param[in] has_alpha Whether the source pixel format alpha channel is used. * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur. * @return The best pixel format to convert to or -1 if none was found. */ enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); /** * @deprecated see av_find_best_pix_fmt_of_2() */ enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); attribute_deprecated #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); #else enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); #endif enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt); /** * @} */ #if FF_API_SET_DIMENSIONS /** * @deprecated this function is not supposed to be used from outside of lavc */ attribute_deprecated void avcodec_set_dimensions(AVCodecContext *s, int width, int height); #endif /** * Put a string representing the codec tag codec_tag in buf. * * @param buf buffer to place codec tag in * @param buf_size size in bytes of buf * @param codec_tag codec tag to assign * @return the length of the string that would have been generated if * enough space had been available, excluding the trailing null */ size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag); void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode); /** * Return a name for the specified profile, if available. * * @param codec the codec that is searched for the given profile * @param profile the profile value for which a name is requested * @return A name for the profile if found, NULL otherwise. */ const char *av_get_profile_name(const AVCodec *codec, int profile); int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size); int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count); //FIXME func typedef /** * Fill AVFrame audio data and linesize pointers. * * The buffer buf must be a preallocated buffer with a size big enough * to contain the specified samples amount. The filled AVFrame data * pointers will point to this buffer. * * AVFrame extended_data channel pointers are allocated if necessary for * planar audio. * * @param frame the AVFrame * frame->nb_samples must be set prior to calling the * function. This function fills in frame->data, * frame->extended_data, frame->linesize[0]. * @param nb_channels channel count * @param sample_fmt sample format * @param buf buffer to use for frame data * @param buf_size size of buffer * @param align plane size sample alignment (0 = default) * @return >=0 on success, negative error code on failure * @todo return the size in bytes required to store the samples in * case of success, at the next libavutil bump */ int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align); /** * Reset the internal decoder state / flush internal buffers. Should be called * e.g. when seeking or when switching to a different stream. * * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0), * this invalidates the frames previously returned from the decoder. When * refcounted frames are used, the decoder just releases any references it might * keep internally, but the caller's reference remains valid. */ void avcodec_flush_buffers(AVCodecContext *avctx); /** * Return codec bits per sample. * * @param[in] codec_id the codec * @return Number of bits per sample or zero if unknown for the given codec. */ int av_get_bits_per_sample(enum AVCodecID codec_id); /** * Return the PCM codec associated with a sample format. * @param be endianness, 0 for little, 1 for big, * -1 (or anything else) for native * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE */ enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be); /** * Return codec bits per sample. * Only return non-zero if the bits per sample is exactly correct, not an * approximation. * * @param[in] codec_id the codec * @return Number of bits per sample or zero if unknown for the given codec. */ int av_get_exact_bits_per_sample(enum AVCodecID codec_id); /** * Return audio frame duration. * * @param avctx codec context * @param frame_bytes size of the frame, or 0 if unknown * @return frame duration, in samples, if known. 0 if not able to * determine. */ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes); typedef struct AVBitStreamFilterContext { void *priv_data; struct AVBitStreamFilter *filter; AVCodecParserContext *parser; struct AVBitStreamFilterContext *next; } AVBitStreamFilterContext; typedef struct AVBitStreamFilter { const char *name; int priv_data_size; int (*filter)(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe); void (*close)(AVBitStreamFilterContext *bsfc); struct AVBitStreamFilter *next; } AVBitStreamFilter; /** * Register a bitstream filter. * * The filter will be accessible to the application code through * av_bitstream_filter_next() or can be directly initialized with * av_bitstream_filter_init(). * * @see avcodec_register_all() */ void av_register_bitstream_filter(AVBitStreamFilter *bsf); /** * Create and initialize a bitstream filter context given a bitstream * filter name. * * The returned context must be freed with av_bitstream_filter_close(). * * @param name the name of the bitstream filter * @return a bitstream filter context if a matching filter was found * and successfully initialized, NULL otherwise */ AVBitStreamFilterContext *av_bitstream_filter_init(const char *name); /** * Filter bitstream. * * This function filters the buffer buf with size buf_size, and places the * filtered buffer in the buffer pointed to by poutbuf. * * The output buffer must be freed by the caller. * * @param bsfc bitstream filter context created by av_bitstream_filter_init() * @param avctx AVCodecContext accessed by the filter, may be NULL. * If specified, this must point to the encoder context of the * output stream the packet is sent to. * @param args arguments which specify the filter configuration, may be NULL * @param poutbuf pointer which is updated to point to the filtered buffer * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes * @param buf buffer containing the data to filter * @param buf_size size in bytes of buf * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data * @return >= 0 in case of success, or a negative error code in case of failure * * If the return value is positive, an output buffer is allocated and * is available in *poutbuf, and is distinct from the input buffer. * * If the return value is 0, the output buffer is not allocated and * should be considered identical to the input buffer, or in case * *poutbuf was set it points to the input buffer (not necessarily to * its starting address). */ int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe); /** * Release bitstream filter context. * * @param bsf the bitstream filter context created with * av_bitstream_filter_init(), can be NULL */ void av_bitstream_filter_close(AVBitStreamFilterContext *bsf); /** * If f is NULL, return the first registered bitstream filter, * if f is non-NULL, return the next registered bitstream filter * after f, or NULL if f is the last one. * * This function can be used to iterate over all registered bitstream * filters. */ AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f); /* memory */ /** * Same behaviour av_fast_malloc but the buffer has additional * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0. * * In addition the whole buffer will initially and after resizes * be 0-initialized so that no uninitialized data will ever appear. */ void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size); /** * Same behaviour av_fast_padded_malloc except that buffer will always * be 0-initialized after call. */ void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size); /** * Encode extradata length to a buffer. Used by xiph codecs. * * @param s buffer to write to; must be at least (v/255+1) bytes long * @param v size of extradata in bytes * @return number of bytes written to the buffer. */ unsigned int av_xiphlacing(unsigned char *s, unsigned int v); #if FF_API_MISSING_SAMPLE /** * Log a generic warning message about a missing feature. This function is * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) * only, and would normally not be used by applications. * @param[in] avc a pointer to an arbitrary struct of which the first field is * a pointer to an AVClass struct * @param[in] feature string containing the name of the missing feature * @param[in] want_sample indicates if samples are wanted which exhibit this feature. * If want_sample is non-zero, additional verbage will be added to the log * message which tells the user how to report samples to the development * mailing list. * @deprecated Use avpriv_report_missing_feature() instead. */ attribute_deprecated void av_log_missing_feature(void *avc, const char *feature, int want_sample); /** * Log a generic warning message asking for a sample. This function is * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) * only, and would normally not be used by applications. * @param[in] avc a pointer to an arbitrary struct of which the first field is * a pointer to an AVClass struct * @param[in] msg string containing an optional message, or NULL if no message * @deprecated Use avpriv_request_sample() instead. */ attribute_deprecated void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3); #endif /* FF_API_MISSING_SAMPLE */ /** * Register the hardware accelerator hwaccel. */ void av_register_hwaccel(AVHWAccel *hwaccel); /** * If hwaccel is NULL, returns the first registered hardware accelerator, * if hwaccel is non-NULL, returns the next registered hardware accelerator * after hwaccel, or NULL if hwaccel is the last one. */ AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel); /** * Lock operation used by lockmgr */ enum AVLockOp { AV_LOCK_CREATE, ///< Create a mutex AV_LOCK_OBTAIN, ///< Lock the mutex AV_LOCK_RELEASE, ///< Unlock the mutex AV_LOCK_DESTROY, ///< Free mutex resources }; /** * Register a user provided lock manager supporting the operations * specified by AVLockOp. mutex points to a (void *) where the * lockmgr should store/get a pointer to a user allocated mutex. It's * NULL upon AV_LOCK_CREATE and != NULL for all other ops. * * @param cb User defined callback. Note: FFmpeg may invoke calls to this * callback during the call to av_lockmgr_register(). * Thus, the application must be prepared to handle that. * If cb is set to NULL the lockmgr will be unregistered. * Also note that during unregistration the previously registered * lockmgr callback may also be invoked. */ int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op)); /** * Get the type of the given codec. */ enum AVMediaType avcodec_get_type(enum AVCodecID codec_id); /** * Get the name of a codec. * @return a static string identifying the codec; never NULL */ const char *avcodec_get_name(enum AVCodecID id); /** * @return a positive value if s is open (i.e. avcodec_open2() was called on it * with no corresponding avcodec_close()), 0 otherwise. */ int avcodec_is_open(AVCodecContext *s); /** * @return a non-zero number if codec is an encoder, zero otherwise */ int av_codec_is_encoder(const AVCodec *codec); /** * @return a non-zero number if codec is a decoder, zero otherwise */ int av_codec_is_decoder(const AVCodec *codec); /** * @return descriptor for given codec ID or NULL if no descriptor exists. */ const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id); /** * Iterate over all codec descriptors known to libavcodec. * * @param prev previous descriptor. NULL to get the first descriptor. * * @return next descriptor or NULL after the last descriptor */ const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev); /** * @return codec descriptor with the given name or NULL if no such descriptor * exists. */ const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name); /** * @} */ #endif /* AVCODEC_AVCODEC_H */