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Code Issues Releases Activity

avformat/smacker: Fix duration for PCM audio

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For non-PCM audio, a Smacker frame contains the size of the decoded
audio in the first four bytes of the audio packet data; for PCM data,
said information would be redundant and according to [1] this field does
not exist. Therefore this commit sets the duration and timestamps
properly for PCM audio.

[1]: https://wiki.multimedia.cx/index.php/Smacker#Audio_Track_Chunk

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-07-24 09:43:02 +02:00
parent 40494460f5
commit 0df4e1ff93
1 changed files with 6 additions and 2 deletions
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8
libavformat/smacker.c
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@ -52,6 +52,7 @@ typedef struct SmackerContext {
int cur_frame;
int videoindex;
int indexes[7];
int duration_size[7];
/* current frame for demuxing */
uint32_t frame_size;
int flags;
@ -197,6 +198,8 @@ static int smacker_read_header(AVFormatContext *s)
if (par->bits_per_coded_sample == 16 &&
par->codec_id == AV_CODEC_ID_PCM_U8)
par->codec_id = AV_CODEC_ID_PCM_S16LE;
else
smk->duration_size[i] = 4;
avpriv_set_pts_info(ast, 64, 1, par->sample_rate * par->channels
* par->bits_per_coded_sample / 8);
}
@ -297,7 +300,7 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
uint32_t size;
size = avio_rl32(s->pb);
if ((int)size < 8 || size > smk->frame_size) {
if ((int)size < 4 + smk->duration_size[i] || size > smk->frame_size) {
av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
ret = AVERROR_INVALIDDATA;
goto next_frame;
@ -315,7 +318,8 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
}
pkt->stream_index = smk->indexes[i];
pkt->pts = smk->aud_pts[i];
pkt->duration = AV_RL32(pkt->data);
pkt->duration = smk->duration_size[i] ? AV_RL32(pkt->data)
: size;
smk->aud_pts[i] += pkt->duration;
smk->next_audio_index = i + 1;
return 0;