592 lines
20 KiB
C
592 lines
20 KiB
C
/*
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* FLV muxer
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* Copyright (c) 2003 The Libav Project
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/dict.h"
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#include "libavutil/intfloat.h"
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#include "avc.h"
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#include "avformat.h"
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#include "flv.h"
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#include "internal.h"
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#include "metadata.h"
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#undef NDEBUG
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#include <assert.h>
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static const AVCodecTag flv_video_codec_ids[] = {
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{ AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
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{ AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
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{ AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
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{ AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
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{ AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
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{ AV_CODEC_ID_H264, FLV_CODECID_H264 },
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{ AV_CODEC_ID_NONE, 0 }
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};
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static const AVCodecTag flv_audio_codec_ids[] = {
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{ AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
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{ AV_CODEC_ID_NONE, 0 }
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};
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typedef struct FLVContext {
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int reserved;
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int64_t duration_offset;
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int64_t filesize_offset;
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int64_t duration;
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int64_t delay; ///< first dts delay (needed for AVC & Speex)
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AVCodecContext *audio_enc;
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AVCodecContext *video_enc;
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double framerate;
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AVCodecContext *data_enc;
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} FLVContext;
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typedef struct FLVStreamContext {
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int64_t last_ts; ///< last timestamp for each stream
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} FLVStreamContext;
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static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)
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{
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int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
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: FLV_SAMPLESSIZE_8BIT;
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if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
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return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
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FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
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else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
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if (enc->sample_rate != 16000) {
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av_log(s, AV_LOG_ERROR,
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"flv only supports wideband (16kHz) Speex audio\n");
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return -1;
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}
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if (enc->channels != 1) {
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av_log(s, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
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return -1;
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}
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return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
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} else {
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switch (enc->sample_rate) {
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case 44100:
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flags |= FLV_SAMPLERATE_44100HZ;
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break;
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case 22050:
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flags |= FLV_SAMPLERATE_22050HZ;
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break;
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case 11025:
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flags |= FLV_SAMPLERATE_11025HZ;
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break;
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case 16000: // nellymoser only
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case 8000: // nellymoser only
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case 5512: // not MP3
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if (enc->codec_id != AV_CODEC_ID_MP3) {
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flags |= FLV_SAMPLERATE_SPECIAL;
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break;
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}
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default:
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av_log(s, AV_LOG_ERROR,
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"flv does not support that sample rate, "
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"choose from (44100, 22050, 11025).\n");
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return -1;
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}
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}
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if (enc->channels > 1)
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flags |= FLV_STEREO;
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switch (enc->codec_id) {
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case AV_CODEC_ID_MP3:
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flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
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break;
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case AV_CODEC_ID_PCM_U8:
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flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
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break;
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case AV_CODEC_ID_PCM_S16BE:
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flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
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break;
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case AV_CODEC_ID_PCM_S16LE:
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flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
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break;
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case AV_CODEC_ID_ADPCM_SWF:
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flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
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break;
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case AV_CODEC_ID_NELLYMOSER:
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if (enc->sample_rate == 8000)
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flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
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else if (enc->sample_rate == 16000)
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flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
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else
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flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
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break;
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case AV_CODEC_ID_PCM_MULAW:
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flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
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break;
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case AV_CODEC_ID_PCM_ALAW:
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flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
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break;
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case 0:
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flags |= enc->codec_tag << 4;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
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return -1;
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}
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return flags;
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}
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static void put_amf_string(AVIOContext *pb, const char *str)
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{
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size_t len = strlen(str);
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avio_wb16(pb, len);
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avio_write(pb, str, len);
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}
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static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
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{
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avio_w8(pb, FLV_TAG_TYPE_VIDEO);
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avio_wb24(pb, 5); /* Tag Data Size */
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avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
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avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
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avio_wb24(pb, 0); /* StreamId = 0 */
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avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
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avio_w8(pb, 2); /* AVC end of sequence */
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avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
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avio_wb32(pb, 16); /* Size of FLV tag */
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}
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static void put_amf_double(AVIOContext *pb, double d)
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{
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avio_w8(pb, AMF_DATA_TYPE_NUMBER);
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avio_wb64(pb, av_double2int(d));
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}
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static void put_amf_bool(AVIOContext *pb, int b)
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{
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avio_w8(pb, AMF_DATA_TYPE_BOOL);
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avio_w8(pb, !!b);
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}
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static void write_metadata(AVFormatContext *s, unsigned int ts)
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{
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AVIOContext *pb = s->pb;
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FLVContext *flv = s->priv_data;
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int metadata_count = 0;
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int64_t metadata_size_pos, data_size, metadata_count_pos;
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AVDictionaryEntry *tag = NULL;
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/* write meta_tag */
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avio_w8(pb, 18); // tag type META
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metadata_size_pos = avio_tell(pb);
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avio_wb24(pb, 0); // size of data part (sum of all parts below)
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avio_wb24(pb, ts); // timestamp
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avio_wb32(pb, 0); // reserved
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/* now data of data_size size */
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/* first event name as a string */
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avio_w8(pb, AMF_DATA_TYPE_STRING);
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put_amf_string(pb, "onMetaData"); // 12 bytes
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/* mixed array (hash) with size and string/type/data tuples */
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avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
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metadata_count_pos = avio_tell(pb);
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metadata_count = 4 * !!flv->video_enc +
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5 * !!flv->audio_enc +
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1 * !!flv->data_enc +
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2; // +2 for duration and file size
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avio_wb32(pb, metadata_count);
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put_amf_string(pb, "duration");
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flv->duration_offset = avio_tell(pb);
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// fill in the guessed duration, it'll be corrected later if incorrect
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put_amf_double(pb, s->duration / AV_TIME_BASE);
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if (flv->video_enc) {
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put_amf_string(pb, "width");
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put_amf_double(pb, flv->video_enc->width);
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put_amf_string(pb, "height");
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put_amf_double(pb, flv->video_enc->height);
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put_amf_string(pb, "videodatarate");
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put_amf_double(pb, flv->video_enc->bit_rate / 1024.0);
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if (flv->framerate != 0.0) {
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put_amf_string(pb, "framerate");
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put_amf_double(pb, flv->framerate);
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metadata_count++;
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}
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put_amf_string(pb, "videocodecid");
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put_amf_double(pb, flv->video_enc->codec_tag);
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}
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if (flv->audio_enc) {
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put_amf_string(pb, "audiodatarate");
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put_amf_double(pb, flv->audio_enc->bit_rate / 1024.0);
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put_amf_string(pb, "audiosamplerate");
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put_amf_double(pb, flv->audio_enc->sample_rate);
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put_amf_string(pb, "audiosamplesize");
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put_amf_double(pb, flv->audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
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put_amf_string(pb, "stereo");
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put_amf_bool(pb, flv->audio_enc->channels == 2);
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put_amf_string(pb, "audiocodecid");
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put_amf_double(pb, flv->audio_enc->codec_tag);
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}
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if (flv->data_enc) {
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put_amf_string(pb, "datastream");
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put_amf_double(pb, 0.0);
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}
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while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
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put_amf_string(pb, tag->key);
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avio_w8(pb, AMF_DATA_TYPE_STRING);
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put_amf_string(pb, tag->value);
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metadata_count++;
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}
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put_amf_string(pb, "filesize");
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flv->filesize_offset = avio_tell(pb);
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put_amf_double(pb, 0); // delayed write
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put_amf_string(pb, "");
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avio_w8(pb, AMF_END_OF_OBJECT);
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/* write total size of tag */
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data_size = avio_tell(pb) - metadata_size_pos - 10;
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avio_seek(pb, metadata_count_pos, SEEK_SET);
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avio_wb32(pb, metadata_count);
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avio_seek(pb, metadata_size_pos, SEEK_SET);
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avio_wb24(pb, data_size);
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avio_skip(pb, data_size + 10 - 3);
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avio_wb32(pb, data_size + 11);
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}
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static int unsupported_codec(AVFormatContext *s,
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const char* type, int codec_id)
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{
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const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
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av_log(s, AV_LOG_ERROR,
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"%s codec %s not compatible with flv\n",
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type,
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desc ? desc->name : "unknown");
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return AVERROR(ENOSYS);
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}
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static int flv_write_header(AVFormatContext *s)
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{
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int i;
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AVIOContext *pb = s->pb;
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FLVContext *flv = s->priv_data;
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int64_t data_size;
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for (i = 0; i < s->nb_streams; i++) {
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AVCodecContext *enc = s->streams[i]->codec;
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FLVStreamContext *sc;
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switch (enc->codec_type) {
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case AVMEDIA_TYPE_VIDEO:
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if (s->streams[i]->avg_frame_rate.den &&
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s->streams[i]->avg_frame_rate.num) {
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flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
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}
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if (flv->video_enc) {
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av_log(s, AV_LOG_ERROR,
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"at most one video stream is supported in flv\n");
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return AVERROR(EINVAL);
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}
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flv->video_enc = enc;
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if (!ff_codec_get_tag(flv_video_codec_ids, enc->codec_id))
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return unsupported_codec(s, "Video", enc->codec_id);
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break;
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case AVMEDIA_TYPE_AUDIO:
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if (flv->audio_enc) {
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av_log(s, AV_LOG_ERROR,
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"at most one audio stream is supported in flv\n");
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return AVERROR(EINVAL);
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}
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flv->audio_enc = enc;
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if (get_audio_flags(s, enc) < 0)
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return unsupported_codec(s, "Audio", enc->codec_id);
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break;
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case AVMEDIA_TYPE_DATA:
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if (enc->codec_id != AV_CODEC_ID_TEXT)
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return unsupported_codec(s, "Data", enc->codec_id);
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flv->data_enc = enc;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
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return -1;
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}
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avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
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sc = av_mallocz(sizeof(FLVStreamContext));
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if (!sc)
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return AVERROR(ENOMEM);
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s->streams[i]->priv_data = sc;
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sc->last_ts = -1;
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}
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flv->delay = AV_NOPTS_VALUE;
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avio_write(pb, "FLV", 3);
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avio_w8(pb, 1);
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avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_enc +
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FLV_HEADER_FLAG_HASVIDEO * !!flv->video_enc);
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avio_wb32(pb, 9);
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avio_wb32(pb, 0);
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for (i = 0; i < s->nb_streams; i++)
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if (s->streams[i]->codec->codec_tag == 5) {
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avio_w8(pb, 8); // message type
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avio_wb24(pb, 0); // include flags
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avio_wb24(pb, 0); // time stamp
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avio_wb32(pb, 0); // reserved
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avio_wb32(pb, 11); // size
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flv->reserved = 5;
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}
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write_metadata(s, 0);
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for (i = 0; i < s->nb_streams; i++) {
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AVCodecContext *enc = s->streams[i]->codec;
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if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264) {
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int64_t pos;
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avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
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FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
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avio_wb24(pb, 0); // size patched later
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avio_wb24(pb, 0); // ts
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avio_w8(pb, 0); // ts ext
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avio_wb24(pb, 0); // streamid
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pos = avio_tell(pb);
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if (enc->codec_id == AV_CODEC_ID_AAC) {
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avio_w8(pb, get_audio_flags(s, enc));
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avio_w8(pb, 0); // AAC sequence header
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avio_write(pb, enc->extradata, enc->extradata_size);
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} else {
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avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
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avio_w8(pb, 0); // AVC sequence header
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avio_wb24(pb, 0); // composition time
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ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
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}
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data_size = avio_tell(pb) - pos;
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avio_seek(pb, -data_size - 10, SEEK_CUR);
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avio_wb24(pb, data_size);
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avio_skip(pb, data_size + 10 - 3);
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avio_wb32(pb, data_size + 11); // previous tag size
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}
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}
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return 0;
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}
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static int flv_write_trailer(AVFormatContext *s)
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{
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int64_t file_size;
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AVIOContext *pb = s->pb;
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FLVContext *flv = s->priv_data;
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int i;
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/* Add EOS tag */
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for (i = 0; i < s->nb_streams; i++) {
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AVCodecContext *enc = s->streams[i]->codec;
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FLVStreamContext *sc = s->streams[i]->priv_data;
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if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
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enc->codec_id == AV_CODEC_ID_H264)
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put_avc_eos_tag(pb, sc->last_ts);
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}
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file_size = avio_tell(pb);
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/* update information */
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if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
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av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
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else
|
|
put_amf_double(pb, flv->duration / (double)1000);
|
|
if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
|
|
av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
|
|
else
|
|
put_amf_double(pb, file_size);
|
|
|
|
avio_seek(pb, file_size, SEEK_SET);
|
|
return 0;
|
|
}
|
|
|
|
static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
|
|
FLVContext *flv = s->priv_data;
|
|
FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
|
|
unsigned ts;
|
|
int size = pkt->size;
|
|
uint8_t *data = NULL;
|
|
int flags = 0, flags_size;
|
|
|
|
if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||
|
|
enc->codec_id == AV_CODEC_ID_AAC)
|
|
flags_size = 2;
|
|
else if (enc->codec_id == AV_CODEC_ID_H264)
|
|
flags_size = 5;
|
|
else
|
|
flags_size = 1;
|
|
|
|
if (flv->delay == AV_NOPTS_VALUE)
|
|
flv->delay = -pkt->dts;
|
|
|
|
if (pkt->dts < -flv->delay) {
|
|
av_log(s, AV_LOG_WARNING,
|
|
"Packets are not in the proper order with respect to DTS\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
ts = pkt->dts + flv->delay; // add delay to force positive dts
|
|
|
|
if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
|
|
write_metadata(s, ts);
|
|
s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
|
|
}
|
|
|
|
switch (enc->codec_type) {
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
avio_w8(pb, FLV_TAG_TYPE_VIDEO);
|
|
|
|
flags = ff_codec_get_tag(flv_video_codec_ids, enc->codec_id);
|
|
|
|
flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
|
|
break;
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
flags = get_audio_flags(s, enc);
|
|
|
|
assert(size);
|
|
|
|
avio_w8(pb, FLV_TAG_TYPE_AUDIO);
|
|
break;
|
|
case AVMEDIA_TYPE_DATA:
|
|
avio_w8(pb, FLV_TAG_TYPE_META);
|
|
break;
|
|
default:
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (enc->codec_id == AV_CODEC_ID_H264)
|
|
/* check if extradata looks like MP4 */
|
|
if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)
|
|
if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
|
|
return -1;
|
|
|
|
/* check Speex packet duration */
|
|
if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
|
|
av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
|
|
"8 frames per packet. Adobe Flash "
|
|
"Player cannot handle this!\n");
|
|
|
|
if (sc->last_ts < ts)
|
|
sc->last_ts = ts;
|
|
|
|
avio_wb24(pb, size + flags_size);
|
|
avio_wb24(pb, ts);
|
|
avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
|
|
avio_wb24(pb, flv->reserved);
|
|
|
|
if (enc->codec_type == AVMEDIA_TYPE_DATA) {
|
|
int data_size;
|
|
int64_t metadata_size_pos = avio_tell(pb);
|
|
avio_w8(pb, AMF_DATA_TYPE_STRING);
|
|
put_amf_string(pb, "onTextData");
|
|
avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
|
|
avio_wb32(pb, 2);
|
|
put_amf_string(pb, "type");
|
|
avio_w8(pb, AMF_DATA_TYPE_STRING);
|
|
put_amf_string(pb, "Text");
|
|
put_amf_string(pb, "text");
|
|
avio_w8(pb, AMF_DATA_TYPE_STRING);
|
|
put_amf_string(pb, pkt->data);
|
|
put_amf_string(pb, "");
|
|
avio_w8(pb, AMF_END_OF_OBJECT);
|
|
/* write total size of tag */
|
|
data_size = avio_tell(pb) - metadata_size_pos;
|
|
avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
|
|
avio_wb24(pb, data_size);
|
|
avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
|
|
avio_wb32(pb, data_size + 11);
|
|
} else {
|
|
avio_w8(pb,flags);
|
|
if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A) {
|
|
if (enc->extradata_size)
|
|
avio_w8(pb, enc->extradata[0]);
|
|
else
|
|
avio_w8(pb, ((FFALIGN(enc->width, 16) - enc->width) << 4) |
|
|
(FFALIGN(enc->height, 16) - enc->height));
|
|
} else if (enc->codec_id == AV_CODEC_ID_AAC)
|
|
avio_w8(pb, 1); // AAC raw
|
|
else if (enc->codec_id == AV_CODEC_ID_H264) {
|
|
avio_w8(pb, 1); // AVC NALU
|
|
avio_wb24(pb, pkt->pts - pkt->dts);
|
|
}
|
|
|
|
avio_write(pb, data ? data : pkt->data, size);
|
|
|
|
avio_wb32(pb, size + flags_size + 11); // previous tag size
|
|
flv->duration = FFMAX(flv->duration,
|
|
pkt->pts + flv->delay + pkt->duration);
|
|
}
|
|
|
|
av_free(data);
|
|
|
|
return pb->error;
|
|
}
|
|
|
|
AVOutputFormat ff_flv_muxer = {
|
|
.name = "flv",
|
|
.long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
|
|
.mime_type = "video/x-flv",
|
|
.extensions = "flv",
|
|
.priv_data_size = sizeof(FLVContext),
|
|
.audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
|
|
.video_codec = AV_CODEC_ID_FLV1,
|
|
.write_header = flv_write_header,
|
|
.write_packet = flv_write_packet,
|
|
.write_trailer = flv_write_trailer,
|
|
.codec_tag = (const AVCodecTag* const []) {
|
|
flv_video_codec_ids, flv_audio_codec_ids, 0
|
|
},
|
|
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
|
|
AVFMT_TS_NONSTRICT,
|
|
};
|