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movenc: use timestamps instead of frame_size for samples-per-packet 

For encoding, AVCodecContext.frame_size is the number of input samples to
send to the encoder and does not necessarily correspond directly to the
timestamps of the output packets.
This commit is contained in:
Justin Ruggles 2012-02-26 16:25:46 -05:00
parent f3dab5fb6d
commit f234e8a32e
1 changed files with 20 additions and 5 deletions
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25
libavformat/movenc.c
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@ -566,6 +566,25 @@ static int get_cluster_duration(MOVTrack *track, int cluster_idx)
return next_dts - track->cluster[cluster_idx].dts;
}
static int get_samples_per_packet(MOVTrack *track)
{
int i, first_duration;
/* use 1 for raw PCM */
if (!track->audio_vbr)
return 1;
/* check to see if duration is constant for all clusters */
if (!track->entry)
return 0;
first_duration = get_cluster_duration(track, 0);
for (i = 1; i < track->entry; i++) {
if (get_cluster_duration(track, i) != first_duration)
return 0;
}
return first_duration;
}
static int mov_write_audio_tag(AVIOContext *pb, MOVTrack *track)
{
int64_t pos = avio_tell(pb);
@ -602,7 +621,7 @@ static int mov_write_audio_tag(AVIOContext *pb, MOVTrack *track)
avio_wb32(pb, av_get_bits_per_sample(track->enc->codec_id));
avio_wb32(pb, mov_get_lpcm_flags(track->enc->codec_id));
avio_wb32(pb, track->sample_size);
avio_wb32(pb, track->audio_vbr ? track->enc->frame_size : 1);
avio_wb32(pb, get_samples_per_packet(track));
} else {
/* reserved for mp4/3gp */
avio_wb16(pb, 2);
@ -3112,10 +3131,6 @@ static int mov_write_header(AVFormatContext *s)
}
/* set audio_vbr for compressed audio */
if (av_get_bits_per_sample(st->codec->codec_id) < 8) {
if (!st->codec->frame_size && track->mode == MODE_MOV) {
av_log(s, AV_LOG_ERROR, "track %d: codec frame size is not set\n", i);
goto error;
}
track->audio_vbr = 1;
}
if (track->mode != MODE_MOV) {