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matroskaenc: Mux clusters better

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Start them on keyframes when reasonable, and delay writing audio packets
to help ensure that there's audio samples available for the first frame in
clusters.

Patch by James Zern <jzern at google>

Originally committed as revision 23473 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
James Zern 2010-06-04 22:40:50 +00:00 committed by David Conrad
parent 3ad0b189f7
commit ac9baa716b
4 changed files with 83 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
libavformat/matroskaenc.c
View File

@ -81,6 +81,8 @@ typedef struct MatroskaMuxContext {
mkv_track *tracks;
struct AVMD5 *md5_ctx;
unsigned int audio_buffer_size;
AVPacket cur_audio_pkt;
} MatroskaMuxContext;
@ -746,6 +748,10 @@ static int mkv_write_header(AVFormatContext *s)
if (mkv->cues == NULL)
return AVERROR(ENOMEM);
av_init_packet(&mkv->cur_audio_pkt);
mkv->cur_audio_pkt.size = 0;
mkv->audio_buffer_size = 0;
put_flush_packet(pb);
return 0;
}
@ -861,7 +867,7 @@ static void mkv_flush_dynbuf(AVFormatContext *s)
mkv->dyn_bc = NULL;
}
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = s->pb;
@ -910,9 +916,38 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
if (ret < 0) return ret;
}
// start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming
if ((url_is_streamed(s->pb) && (url_ftell(pb) > 32*1024 || ts > mkv->cluster_pts + 1000))
|| url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || ts > mkv->cluster_pts + 5000) {
mkv->duration = FFMAX(mkv->duration, ts + duration);
return 0;
}
static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
{
uint8_t *data = mkv->cur_audio_pkt.data;
mkv->cur_audio_pkt = *pkt;
mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
if (!mkv->cur_audio_pkt.data)
return AVERROR(ENOMEM);
memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
mkv->cur_audio_pkt.size = pkt->size;
return 0;
}
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = url_is_streamed(s->pb) ? mkv->dyn_bc : s->pb;
AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
int cluster_size = url_ftell(pb) - (url_is_streamed(s->pb) ? 0 : mkv->cluster_pos);
// start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
// after 4k and on a keyframe
if (mkv->cluster_pos &&
((url_is_streamed(s->pb) && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
|| cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
|| (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
" bytes, pts %" PRIu64 "\n", url_ftell(pb), ts);
end_ebml_master(pb, mkv->cluster);
@ -921,8 +956,23 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
mkv_flush_dynbuf(s);
}
mkv->duration = FFMAX(mkv->duration, ts + duration);
return 0;
// check if we have an audio packet cached
if (mkv->cur_audio_pkt.size > 0) {
ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
mkv->cur_audio_pkt.size = 0;
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
return ret;
}
}
// buffer an audio packet to ensure the packet containing the video
// keyframe's timecode is contained in the same cluster for WebM
if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
ret = mkv_copy_packet(mkv, pkt);
else
ret = mkv_write_packet_internal(s, pkt);
return ret;
}
static int mkv_write_trailer(AVFormatContext *s)
@ -932,6 +982,16 @@ static int mkv_write_trailer(AVFormatContext *s)
int64_t currentpos, second_seekhead, cuespos;
int ret;
// check if we have an audio packet cached
if (mkv->cur_audio_pkt.size > 0) {
ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
mkv->cur_audio_pkt.size = 0;
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
return ret;
}
}
if (mkv->dyn_bc) {
end_ebml_master(mkv->dyn_bc, mkv->cluster);
mkv_flush_dynbuf(s);
@ -970,6 +1030,7 @@ static int mkv_write_trailer(AVFormatContext *s)
end_ebml_master(pb, mkv->segment);
av_free(mkv->md5_ctx);
av_free(mkv->tracks);
av_destruct_packet(&mkv->cur_audio_pkt);
put_flush_packet(pb);
return 0;
}

4
tests/ref/acodec/pcm
View File

@ -22,11 +22,11 @@ stddev: 0.00 PSNR:999.99 bytes: 1058444/ 1058444
1058444 ./tests/data/acodec/pcm_s16le.wav
95e54b261530a1bcf6de6fe3b21dc5f6 *./tests/data/pcm.acodec.out.wav
stddev: 0.00 PSNR:999.99 bytes: 1058444/ 1058444
43440f8078f2383c0dd618ad606f6830 *./tests/data/acodec/pcm_s16be.mkv
fca887459876a7fdc4b9580691acd835 *./tests/data/acodec/pcm_s16be.mkv
1060693 ./tests/data/acodec/pcm_s16be.mkv
95e54b261530a1bcf6de6fe3b21dc5f6 *./tests/data/pcm.acodec.out.wav
stddev: 0.00 PSNR:999.99 bytes: 1058444/ 1058444
1e63166f1672b7eb00877c697c06743c *./tests/data/acodec/pcm_s16le.mkv
2817e2a028a9117d4809604fa0f81a80 *./tests/data/acodec/pcm_s16le.mkv
1060693 ./tests/data/acodec/pcm_s16le.mkv
95e54b261530a1bcf6de6fe3b21dc5f6 *./tests/data/pcm.acodec.out.wav
stddev: 0.00 PSNR:999.99 bytes: 1058444/ 1058444

4
tests/ref/lavf/mkv
View File

@ -1,3 +1,3 @@
cf230e089e737ed9449fbfb3cb87da92 *./tests/data/lavf/lavf.mkv
320471 ./tests/data/lavf/lavf.mkv
5e906a7003f893cf6481f186c92dc16c *./tests/data/lavf/lavf.mkv
320537 ./tests/data/lavf/lavf.mkv
./tests/data/lavf/lavf.mkv CRC=0x2a83e6b0

24
tests/ref/seek/lavf.mkv.ref
View File

@ -2,35 +2,35 @@ ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st:-1 flags:0 ts:-1.000000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st:-1 flags:1 ts: 1.894167
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291934 size: 27834
ret: 0 st: 0 flags:0 ts: 0.788000
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291934 size: 27834
ret: 0 st: 0 flags:1 ts:-0.317000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st: 1 flags:0 ts: 2.577000
ret:-EOF
ret: 0 st: 1 flags:1 ts: 1.471000
ret: 0 st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320175 size: 209
ret: 0 st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320207 size: 209
ret: 0 st:-1 flags:0 ts: 0.365002
ret: 0 st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146687 size: 27925
ret: 0 st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146703 size: 27925
ret: 0 st:-1 flags:1 ts:-0.740831
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st: 0 flags:0 ts: 2.153000
ret:-EOF
ret: 0 st: 0 flags:1 ts: 1.048000
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291934 size: 27834
ret: 0 st: 1 flags:0 ts:-0.058000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st: 1 flags:1 ts: 2.836000
ret: 0 st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320175 size: 209
ret: 0 st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320207 size: 209
ret: 0 st:-1 flags:0 ts: 1.730004
ret:-EOF
ret: 0 st:-1 flags:1 ts: 0.624171
ret: 0 st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146687 size: 27925
ret: 0 st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146703 size: 27925
ret: 0 st: 0 flags:0 ts:-0.482000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st: 0 flags:1 ts: 2.413000
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291934 size: 27834
ret: 0 st: 1 flags:0 ts: 1.307000
ret:-EOF
ret: 0 st: 1 flags:1 ts: 0.201000
@ -38,16 +38,16 @@ ret: 0 st: 1 flags:1 dts: 0.183000 pts: 0.183000 pos: 72083 size: 209
ret: 0 st:-1 flags:0 ts:-0.904994
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st:-1 flags:1 ts: 1.989173
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291934 size: 27834
ret: 0 st: 0 flags:0 ts: 0.883000
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
ret: 0 st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291934 size: 27834
ret: 0 st: 0 flags:1 ts:-0.222000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837
ret: 0 st: 1 flags:0 ts: 2.672000
ret:-EOF
ret: 0 st: 1 flags:1 ts: 1.566000
ret: 0 st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320175 size: 209
ret: 0 st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320207 size: 209
ret: 0 st:-1 flags:0 ts: 0.460008
ret: 0 st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146687 size: 27925
ret: 0 st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146703 size: 27925
ret: 0 st:-1 flags:1 ts:-0.645825
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 513 size: 27837