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matroskaenc: correctly handle h264 streams with 3 bytes nal startcodes

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This implies using ff_avc_parse_nal_units_buf instead of ff_avc_parse_nal_units
because with 3 bytes startcodes the parsed packet size will change, and the
size must be written before the packet content.

Originally committed as revision 16690 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2009-01-20 00:52:12 +00:00
parent c2fef0c163
commit 5f8bae8d5c
1 changed files with 11 additions and 9 deletions
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20
libavformat/matroskaenc.c
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@ -788,23 +788,25 @@ static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = s->pb;
AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
uint8_t *data = NULL;
int size = pkt->size;
av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
"pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
if (codec->codec_id == CODEC_ID_H264 && codec->extradata_size > 0 &&
(AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
else
data = pkt->data;
put_ebml_id(pb, blockid);
put_ebml_num(pb, pkt->size+4, 0);
put_ebml_num(pb, size+4, 0);
put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
put_be16(pb, pkt->pts - mkv->cluster_pts);
put_byte(pb, flags);
if (codec->codec_id == CODEC_ID_H264 &&
codec->extradata_size > 0 && AV_RB32(codec->extradata) == 0x00000001) {
/* from x264 or from bytestream h264 */
/* nal reformating needed */
ff_avc_parse_nal_units(pb, pkt->data, pkt->size);
} else {
put_buffer(pb, pkt->data, pkt->size);
}
put_buffer(pb, data, size);
if (data != pkt->data)
av_free(data);
}
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)