/* * Raw Video Decoder * 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 */ /** * @file * Raw Video Decoder */ #include "avcodec.h" #include "bswapdsp.h" #include "get_bits.h" #include "internal.h" #include "raw.h" #include "libavutil/avassert.h" #include "libavutil/buffer.h" #include "libavutil/common.h" #include "libavutil/intreadwrite.h" #include "libavutil/imgutils.h" #include "libavutil/opt.h" typedef struct RawVideoContext { AVClass *av_class; AVBufferRef *palette; int frame_size; /* size of the frame in bytes */ int flip; int is_2_4_bpp; // 2 or 4 bpp raw in avi/mov int is_yuv2; int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16 int tff; BswapDSPContext bbdsp; void *bitstream_buf; unsigned int bitstream_buf_size; } RawVideoContext; static const AVOption options[]={ {"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM}, {NULL} }; static const AVClass rawdec_class = { .class_name = "rawdec", .option = options, .version = LIBAVUTIL_VERSION_INT, }; static av_cold int raw_init_decoder(AVCodecContext *avctx) { RawVideoContext *context = avctx->priv_data; const AVPixFmtDescriptor *desc; ff_bswapdsp_init(&context->bbdsp); if ( avctx->codec_tag == MKTAG('r','a','w',' ') || avctx->codec_tag == MKTAG('N','O','1','6')) avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_mov, avctx->bits_per_coded_sample); else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W')) avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi, avctx->bits_per_coded_sample); else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0)) avctx->pix_fmt = avpriv_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag); else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample) avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi, avctx->bits_per_coded_sample); desc = av_pix_fmt_desc_get(avctx->pix_fmt); if (!desc) { av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n"); return AVERROR(EINVAL); } if (desc->flags & (AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_PSEUDOPAL)) { context->palette = av_buffer_alloc(AVPALETTE_SIZE); if (!context->palette) return AVERROR(ENOMEM); if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt); else memset(context->palette->data, 0, AVPALETTE_SIZE); } if ((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) || avctx->codec_tag == MKTAG('c','y','u','v') || avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W')) context->flip = 1; if (avctx->codec_tag == AV_RL32("yuv2") && avctx->pix_fmt == AV_PIX_FMT_YUYV422) context->is_yuv2 = 1; return 0; } static void flip(AVCodecContext *avctx, AVPicture *picture) { picture->data[0] += picture->linesize[0] * (avctx->height - 1); picture->linesize[0] *= -1; } /* * Scale sample to 16-bit resolution */ #define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16))) /** * Scale buffer to 16 bits per coded sample resolution */ #define MKSCALE16(name, r16, w16) \ static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \ { \ int i; \ if (!packed) { \ for (i = 0; i + 1 < buf_size; i += 2) \ w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \ } else { \ GetBitContext gb; \ init_get_bits(&gb, buf, buf_size * 8); \ for (i = 0; i < avctx->width * avctx->height; i++) { \ int sample = get_bits(&gb, avctx->bits_per_coded_sample); \ w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \ } \ } \ } MKSCALE16(scale16be, AV_RB16, AV_WB16) MKSCALE16(scale16le, AV_RL16, AV_WL16) static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt); RawVideoContext *context = avctx->priv_data; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; int linesize_align = 4; int res, len; int need_copy; AVFrame *frame = data; AVPicture *picture = data; if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) && avctx->pix_fmt == AV_PIX_FMT_PAL8 && (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) { context->is_2_4_bpp = 1; context->frame_size = avpicture_get_size(avctx->pix_fmt, FFALIGN(avctx->width, 16), avctx->height); } else { context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16; context->frame_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); } if (context->frame_size < 0) return context->frame_size; need_copy = !avpkt->buf || context->is_2_4_bpp || context->is_yuv2 || context->is_lt_16bpp; frame->pict_type = AV_PICTURE_TYPE_I; frame->key_frame = 1; res = ff_decode_frame_props(avctx, frame); if (res < 0) return res; av_frame_set_pkt_pos (frame, avctx->internal->pkt->pos); av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration); if (context->tff >= 0) { frame->interlaced_frame = 1; frame->top_field_first = context->tff; } if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) return res; if (need_copy) frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size)); else frame->buf[0] = av_buffer_ref(avpkt->buf); if (!frame->buf[0]) return AVERROR(ENOMEM); //2bpp and 4bpp raw in avi and mov (yes this is ugly ...) if (context->is_2_4_bpp) { int i; uint8_t *dst = frame->buf[0]->data; buf_size = context->frame_size - AVPALETTE_SIZE; if (avctx->bits_per_coded_sample == 4) { for (i = 0; 2 * i + 1 < buf_size && i<avpkt->size; i++) { dst[2 * i + 0] = buf[i] >> 4; dst[2 * i + 1] = buf[i] & 15; } linesize_align = 8; } else { av_assert0(avctx->bits_per_coded_sample == 2); for (i = 0; 4 * i + 3 < buf_size && i<avpkt->size; i++) { dst[4 * i + 0] = buf[i] >> 6; dst[4 * i + 1] = buf[i] >> 4 & 3; dst[4 * i + 2] = buf[i] >> 2 & 3; dst[4 * i + 3] = buf[i] & 3; } linesize_align = 16; } buf = dst; } else if (context->is_lt_16bpp) { uint8_t *dst = frame->buf[0]->data; int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0); int swap = avctx->codec_tag >> 24; if (packed && swap) { av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size); if (!context->bitstream_buf) return AVERROR(ENOMEM); if (swap == 16) context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2); else if (swap == 32) context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4); else return AVERROR_INVALIDDATA; buf = context->bitstream_buf; } if (desc->flags & AV_PIX_FMT_FLAG_BE) scale16be(avctx, dst, buf, buf_size, packed); else scale16le(avctx, dst, buf, buf_size, packed); buf = dst; } else if (need_copy) { memcpy(frame->buf[0]->data, buf, buf_size); buf = frame->buf[0]->data; } if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') || avctx->codec_tag == MKTAG('A', 'V', 'u', 'p')) buf += buf_size - context->frame_size; len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0); if (buf_size < len && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0)) { av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len); av_buffer_unref(&frame->buf[0]); return AVERROR(EINVAL); } if ((res = avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height)) < 0) { av_buffer_unref(&frame->buf[0]); return res; } if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); if (pal) { av_buffer_unref(&context->palette); context->palette = av_buffer_alloc(AVPALETTE_SIZE); if (!context->palette) { av_buffer_unref(&frame->buf[0]); return AVERROR(ENOMEM); } memcpy(context->palette->data, pal, AVPALETTE_SIZE); frame->palette_has_changed = 1; } } if ((avctx->pix_fmt==AV_PIX_FMT_BGR24 || avctx->pix_fmt==AV_PIX_FMT_GRAY8 || avctx->pix_fmt==AV_PIX_FMT_RGB555LE || avctx->pix_fmt==AV_PIX_FMT_RGB555BE || avctx->pix_fmt==AV_PIX_FMT_RGB565LE || avctx->pix_fmt==AV_PIX_FMT_MONOWHITE || avctx->pix_fmt==AV_PIX_FMT_PAL8) && FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size) frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align); if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') && FFALIGN(frame->linesize[0], linesize_align) * avctx->height + FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) { int la0 = FFALIGN(frame->linesize[0], linesize_align); frame->data[1] += (la0 - frame->linesize[0]) * avctx->height; frame->linesize[0] = la0; frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align); } if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) || (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) { frame->buf[1] = av_buffer_ref(context->palette); if (!frame->buf[1]) { av_buffer_unref(&frame->buf[0]); return AVERROR(ENOMEM); } frame->data[1] = frame->buf[1]->data; } if (avctx->pix_fmt == AV_PIX_FMT_BGR24 && ((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size) frame->linesize[0] = (frame->linesize[0] + 3) & ~3; if (context->flip) flip(avctx, picture); if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') || avctx->codec_tag == MKTAG('Y', 'V', '1', '6') || avctx->codec_tag == MKTAG('Y', 'V', '2', '4') || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9')) FFSWAP(uint8_t *, picture->data[1], picture->data[2]); if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) { picture->data[1] = picture->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height; picture->data[2] = picture->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4; } if (avctx->codec_tag == AV_RL32("yuv2") && avctx->pix_fmt == AV_PIX_FMT_YUYV422) { int x, y; uint8_t *line = picture->data[0]; for (y = 0; y < avctx->height; y++) { for (x = 0; x < avctx->width; x++) line[2 * x + 1] ^= 0x80; line += picture->linesize[0]; } } if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */ frame->interlaced_frame = 1; if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB) frame->top_field_first = 1; } *got_frame = 1; return buf_size; } static av_cold int raw_close_decoder(AVCodecContext *avctx) { RawVideoContext *context = avctx->priv_data; av_buffer_unref(&context->palette); return 0; } AVCodec ff_rawvideo_decoder = { .name = "rawvideo", .long_name = NULL_IF_CONFIG_SMALL("raw video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_RAWVIDEO, .priv_data_size = sizeof(RawVideoContext), .init = raw_init_decoder, .close = raw_close_decoder, .decode = raw_decode, .priv_class = &rawdec_class, .capabilities = AV_CODEC_CAP_PARAM_CHANGE, };