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lavf: switch to AVStream.time_base as the hint for the muxer timebase

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Previously, AVStream.codec.time_base was used for that purpose, which
was quite confusing for the callers. This change also opens the path for
removing AVStream.codec.

The change in the lavf-mkv test is due to the native timebase (1/1000)
being used instead of the default one (1/90000), so the packets are now
sent to the crc muxer in the same order in which they are demuxed
(previously some of them got reordered because of inexact timestamp
conversion).
pull/76/merge
Anton Khirnov 11 years ago
parent d754ed4172
commit 194be1f43e
18 changed files with 90 additions and 43 deletions
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  1. 5
      doc/APIchanges
  2. 9
      libavformat/avformat.h
  3. 15
      libavformat/avienc.c
  4. 3
      libavformat/filmstripenc.c
  5. 1
      libavformat/framehash.c
  6. 14
      libavformat/movenc.c
  7. 13
      libavformat/mpegtsenc.c
  8. 26
      libavformat/mux.c
  9. 5
      libavformat/mxfenc.c
  10. 3
      libavformat/oggenc.c
  11. 4
      libavformat/riffenc.c
  12. 5
      libavformat/rmenc.c
  13. 1
      libavformat/swf.h
  14. 6
      libavformat/swfenc.c
  15. 9
      libavformat/utils.c
  16. 7
      libavformat/version.h
  17. 5
      libavformat/yuv4mpegenc.c
  18. 2
      tests/ref/lavf/mkv

5
doc/APIchanges
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@ -13,6 +13,11 @@ libavutil: 2013-12-xx
API changes, most recent first:
2014-xx-xx - xxxxxxx - lavf 55.20.0 - avformat.h
The proper way for providing a hint about the desired timebase to the muxers
is now setting AVStream.time_base, instead of AVStream.codec.time_base as was
done previously. The old method is now deprecated.
2014-04-xx - xxxxxxx - lavc 55.54.0 - avcodec.h
Add AVCodecContext.side_data_only_packets to allow encoders to output packets
with only side data. This option may become mandatory in the future, so all

9
libavformat/avformat.h
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@ -710,9 +710,12 @@ typedef struct AVStream {
* of which frame timestamps are represented.
*
* decoding: set by libavformat
* encoding: set by libavformat in avformat_write_header. The muxer may use the
* user-provided value of @ref AVCodecContext.time_base "codec->time_base"
* as a hint.
* encoding: May be set by the caller before avformat_write_header() to
* provide a hint to the muxer about the desired timebase. In
* avformat_write_header(), the muxer will overwrite this field
* with the timebase that will actually be used for the timestamps
* written into the file (which may or may not be related to the
* user-provided one, depending on the format).
*/
AVRational time_base;

15
libavformat/avienc.c
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@ -144,6 +144,7 @@ static int avi_write_header(AVFormatContext *s)
AVIOContext *pb = s->pb;
int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
AVCodecContext *video_enc;
AVStream *video_st = NULL;
int64_t list1, list2, strh, strf;
AVDictionaryEntry *t = NULL;
@ -172,15 +173,18 @@ static int avi_write_header(AVFormatContext *s)
for (n = 0; n < s->nb_streams; n++) {
AVCodecContext *codec = s->streams[n]->codec;
bitrate += codec->bit_rate;
if (codec->codec_type == AVMEDIA_TYPE_VIDEO)
if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
video_enc = codec;
video_st = s->streams[n];
}
}
nb_frames = 0;
if (video_enc)
avio_wl32(pb, (uint32_t) (INT64_C(1000000) * video_enc->time_base.num /
video_enc->time_base.den));
// TODO: should be avg_frame_rate
if (video_st)
avio_wl32(pb, (uint32_t) (INT64_C(1000000) * video_st->time_base.num /
video_st->time_base.den));
else
avio_wl32(pb, 0);
avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
@ -337,7 +341,8 @@ static int avi_write_header(AVFormatContext *s)
avio_wl32(pb, 0); // video format = unknown
avio_wl32(pb, 0); // video standard = unknown
avio_wl32(pb, lrintf(1.0 / av_q2d(enc->time_base)));
// TODO: should be avg_frame_rate
avio_wl32(pb, lrintf(1.0 / av_q2d(st->time_base)));
avio_wl32(pb, enc->width);
avio_wl32(pb, enc->height);
avio_wl16(pb, den);

3
libavformat/filmstripenc.c
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@ -64,7 +64,8 @@ static int write_trailer(AVFormatContext *s)
avio_wb16(pb, st->codec->width);
avio_wb16(pb, st->codec->height);
avio_wb16(pb, 0); // leading
avio_wb16(pb, 1/av_q2d(st->codec->time_base));
// TODO: should be avg_frame_rate
avio_wb16(pb, 1/av_q2d(st->time_base));
for (i = 0; i < 16; i++)
avio_w8(pb, 0x00); // reserved

1
libavformat/framehash.c
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@ -25,7 +25,6 @@ int ff_framehash_write_header(AVFormatContext *s)
int i;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
avio_printf(s->pb, "#tb %d: %d/%d\n", i, st->time_base.num, st->time_base.den);
avio_flush(s->pb);
}

14
libavformat/movenc.c
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@ -814,10 +814,10 @@ static int mov_get_dv_codec_tag(AVFormatContext *s, MOVTrack *track)
else if (track->enc->pix_fmt == AV_PIX_FMT_YUV420P) tag = MKTAG('d','v','c','p');
else tag = MKTAG('d','v','p','p');
else if (track->enc->height == 720) /* HD 720 line */
if (track->enc->time_base.den == 50) tag = MKTAG('d','v','h','q');
if (track->st->time_base.den == 50) tag = MKTAG('d','v','h','q');
else tag = MKTAG('d','v','h','p');
else if (track->enc->height == 1080) /* HD 1080 line */
if (track->enc->time_base.den == 25) tag = MKTAG('d','v','h','5');
if (track->st->time_base.den == 25) tag = MKTAG('d','v','h','5');
else tag = MKTAG('d','v','h','6');
else {
av_log(s, AV_LOG_ERROR, "unsupported height for dv codec\n");
@ -2656,10 +2656,12 @@ static int mov_write_ftyp_tag(AVIOContext *pb, AVFormatContext *s)
static void mov_write_uuidprof_tag(AVIOContext *pb, AVFormatContext *s)
{
AVStream *video_st = s->streams[0];
AVCodecContext *video_codec = s->streams[0]->codec;
AVCodecContext *audio_codec = s->streams[1]->codec;
int audio_rate = audio_codec->sample_rate;
int frame_rate = ((video_codec->time_base.den) * (0x10000)) / (video_codec->time_base.num);
// TODO: should be avg_frame_rate
int frame_rate = ((video_st->time_base.den) * (0x10000)) / (video_st->time_base.num);
int audio_kbitrate = audio_codec->bit_rate / 1000;
int video_kbitrate = FFMIN(video_codec->bit_rate / 1000, 800 - audio_kbitrate);
@ -3400,7 +3402,7 @@ static int mov_write_header(AVFormatContext *s)
}
track->height = track->tag >> 24 == 'n' ? 486 : 576;
}
track->timescale = st->codec->time_base.den;
track->timescale = st->time_base.den;
if (track->mode == MODE_MOV && track->timescale > 100000)
av_log(s, AV_LOG_WARNING,
"WARNING codec timebase is very high. If duration is too long,\n"
@ -3428,9 +3430,9 @@ static int mov_write_header(AVFormatContext *s)
goto error;
}
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
track->timescale = st->codec->time_base.den;
track->timescale = st->time_base.den;
} else if (st->codec->codec_type == AVMEDIA_TYPE_DATA) {
track->timescale = st->codec->time_base.den;
track->timescale = st->time_base.den;
}
if (!track->height)
track->height = st->codec->height;

13
libavformat/mpegtsenc.c
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@ -194,6 +194,7 @@ typedef struct MpegTSWriteStream {
int payload_flags;
uint8_t *payload;
AVFormatContext *amux;
AVRational user_tb;
} MpegTSWriteStream;
static void mpegts_write_pat(AVFormatContext *s)
@ -480,13 +481,17 @@ static int mpegts_write_header(AVFormatContext *s)
/* assign pids to each stream */
for(i = 0;i < s->nb_streams; i++) {
st = s->streams[i];
avpriv_set_pts_info(st, 33, 1, 90000);
ts_st = av_mallocz(sizeof(MpegTSWriteStream));
if (!ts_st) {
ret = AVERROR(ENOMEM);
goto fail;
}
st->priv_data = ts_st;
ts_st->user_tb = st->time_base;
avpriv_set_pts_info(st, 33, 1, 90000);
ts_st->payload = av_mallocz(ts->pes_payload_size);
if (!ts_st->payload) {
ret = AVERROR(ENOMEM);
@ -557,7 +562,8 @@ static int mpegts_write_header(AVFormatContext *s)
pcr_st = s->streams[0];
ts_st = pcr_st->priv_data;
service->pcr_pid = ts_st->pid;
}
} else
ts_st = pcr_st->priv_data;
if (ts->mux_rate > 1) {
service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
@ -583,8 +589,9 @@ static int mpegts_write_header(AVFormatContext *s)
}
} else {
// max delta PCR 0.1s
// TODO: should be avg_frame_rate
service->pcr_packet_period =
pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
ts_st->user_tb.den / (10 * ts_st->user_tb.num);
}
}

26
libavformat/mux.c
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@ -115,6 +115,25 @@ static int init_muxer(AVFormatContext *s, AVDictionary **options)
st = s->streams[i];
codec = st->codec;
#if FF_API_LAVF_CODEC_TB
FF_DISABLE_DEPRECATION_WARNINGS
if (!st->time_base.num && codec->time_base.num) {
av_log(s, AV_LOG_WARNING, "Using AVStream.codec.time_base as a "
"timebase hint to the muxer is deprecated. Set "
"AVStream.time_base instead.\n");
avpriv_set_pts_info(st, 64, codec->time_base.num, codec->time_base.den);
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (!st->time_base.num) {
/* fall back on the default timebase values */
if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->sample_rate)
avpriv_set_pts_info(st, 64, 1, codec->sample_rate);
else
avpriv_set_pts_info(st, 33, 1, 90000);
}
switch (codec->codec_type) {
case AVMEDIA_TYPE_AUDIO:
if (codec->sample_rate <= 0) {
@ -127,13 +146,6 @@ static int init_muxer(AVFormatContext *s, AVDictionary **options)
av_get_bits_per_sample(codec->codec_id) >> 3;
break;
case AVMEDIA_TYPE_VIDEO:
if (codec->time_base.num <= 0 ||
codec->time_base.den <= 0) { //FIXME audio too?
av_log(s, AV_LOG_ERROR, "time base not set\n");
ret = AVERROR(EINVAL);
goto fail;
}
if ((codec->width <= 0 || codec->height <= 0) &&
!(of->flags & AVFMT_NODIMENSIONS)) {
av_log(s, AV_LOG_ERROR, "dimensions not set\n");

5
libavformat/mxfenc.c
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@ -1433,11 +1433,12 @@ static int mxf_write_header(AVFormatContext *s)
av_log(s, AV_LOG_ERROR, "video stream must be first track\n");
return -1;
}
if (fabs(av_q2d(st->codec->time_base) - 1/25.0) < 0.0001) {
// TODO: should be avg_frame_rate
if (fabs(av_q2d(st->time_base) - 1/25.0) < 0.0001) {
samples_per_frame = PAL_samples_per_frame;
mxf->time_base = (AVRational){ 1, 25 };
mxf->timecode_base = 25;
} else if (fabs(av_q2d(st->codec->time_base) - 1001/30000.0) < 0.0001) {
} else if (fabs(av_q2d(st->time_base) - 1001/30000.0) < 0.0001) {
samples_per_frame = NTSC_samples_per_frame;
mxf->time_base = (AVRational){ 1001, 30000 };
mxf->timecode_base = 30;

3
libavformat/oggenc.c
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@ -428,8 +428,7 @@ static int ogg_write_header(AVFormatContext *s)
avpriv_set_pts_info(st, 64, 1, 48000);
else
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
st->codec->codec_id != AV_CODEC_ID_THEORA &&
st->codec->codec_id != AV_CODEC_ID_SPEEX &&

4
libavformat/riffenc.c
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@ -230,8 +230,8 @@ void ff_parse_specific_params(AVStream *st, int *au_rate,
} else if (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
codec->codec_type == AVMEDIA_TYPE_DATA ||
codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
*au_scale = codec->time_base.num;
*au_rate = codec->time_base.den;
*au_scale = st->time_base.num;
*au_rate = st->time_base.den;
} else {
*au_scale = codec->block_align ? codec->block_align * 8 : 8;
*au_rate = codec->bit_rate ? codec->bit_rate :

5
libavformat/rmenc.c
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@ -310,6 +310,8 @@ static int rm_write_header(AVFormatContext *s)
AVCodecContext *codec;
for(n=0;n<s->nb_streams;n++) {
AVStream *st = s->streams[n];
s->streams[n]->id = n;
codec = s->streams[n]->codec;
stream = &rm->streams[n];
@ -329,7 +331,8 @@ static int rm_write_header(AVFormatContext *s)
break;
case AVMEDIA_TYPE_VIDEO:
rm->video_stream = stream;
stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
// TODO: should be avg_frame_rate
stream->frame_rate = (float)st->time_base.den / (float)st->time_base.num;
/* XXX: dummy values */
stream->packet_max_size = 4096;
stream->nb_packets = 0;

1
libavformat/swf.h
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@ -76,6 +76,7 @@ typedef struct SWFContext {
int tag;
AVFifoBuffer *audio_fifo;
AVCodecContext *audio_enc, *video_enc;
AVStream *video_st;
} SWFContext;
extern const AVCodecTag ff_swf_codec_tags[];

6
libavformat/swfenc.c
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@ -207,6 +207,7 @@ static int swf_write_header(AVFormatContext *s)
if (enc->codec_id == AV_CODEC_ID_VP6F ||
enc->codec_id == AV_CODEC_ID_FLV1 ||
enc->codec_id == AV_CODEC_ID_MJPEG) {
swf->video_st = s->streams[i];
swf->video_enc = enc;
} else {
av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
@ -224,8 +225,9 @@ static int swf_write_header(AVFormatContext *s)
} else {
width = swf->video_enc->width;
height = swf->video_enc->height;
rate = swf->video_enc->time_base.den;
rate_base = swf->video_enc->time_base.num;
// TODO: should be avg_frame_rate
rate = swf->video_st->time_base.den;
rate_base = swf->video_st->time_base.num;
}
if (!swf->audio_enc)

9
libavformat/utils.c
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@ -2663,9 +2663,14 @@ AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c)
}
st->codec = avcodec_alloc_context3(c);
if (s->iformat)
if (s->iformat) {
/* no default bitrate if decoding */
st->codec->bit_rate = 0;
/* default pts setting is MPEG-like */
avpriv_set_pts_info(st, 33, 1, 90000);
}
st->index = s->nb_streams;
st->start_time = AV_NOPTS_VALUE;
st->duration = AV_NOPTS_VALUE;
@ -2677,8 +2682,6 @@ AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c)
st->first_dts = AV_NOPTS_VALUE;
st->probe_packets = MAX_PROBE_PACKETS;
/* default pts setting is MPEG-like */
avpriv_set_pts_info(st, 33, 1, 90000);
st->last_IP_pts = AV_NOPTS_VALUE;
for (i = 0; i < MAX_REORDER_DELAY + 1; i++)
st->pts_buffer[i] = AV_NOPTS_VALUE;

7
libavformat/version.h
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@ -30,8 +30,8 @@
#include "libavutil/version.h"
#define LIBAVFORMAT_VERSION_MAJOR 55
#define LIBAVFORMAT_VERSION_MINOR 19
#define LIBAVFORMAT_VERSION_MICRO 1
#define LIBAVFORMAT_VERSION_MINOR 20
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \
@ -57,5 +57,8 @@
#ifndef FF_API_LAVF_FRAC
#define FF_API_LAVF_FRAC (LIBAVFORMAT_VERSION_MAJOR < 57)
#endif
#ifndef FF_API_LAVF_CODEC_TB
#define FF_API_LAVF_CODEC_TB (LIBAVFORMAT_VERSION_MAJOR < 57)
#endif
#endif /* AVFORMAT_VERSION_H */

5
libavformat/yuv4mpegenc.c
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@ -38,8 +38,9 @@ static int yuv4_generate_header(AVFormatContext *s, char* buf)
width = st->codec->width;
height = st->codec->height;
av_reduce(&raten, &rated, st->codec->time_base.den,
st->codec->time_base.num, (1UL << 31) - 1);
// TODO: should be avg_frame_rate
av_reduce(&raten, &rated, st->time_base.den,
st->time_base.num, (1UL << 31) - 1);
aspectn = st->sample_aspect_ratio.num;
aspectd = st->sample_aspect_ratio.den;

2
tests/ref/lavf/mkv
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@ -1,3 +1,3 @@
268fb8f9278b0df2f87a6a9455f3cd56 *./tests/data/lavf/lavf.mkv
320380 ./tests/data/lavf/lavf.mkv
./tests/data/lavf/lavf.mkv CRC=0xbe7d3cda
./tests/data/lavf/lavf.mkv CRC=0x36193cda

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