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avformat/smacker: Support seeking to first frame 

Add .read_seek function to the smacker demuxer for the special case of
seeking to ts=0. This is useful because smacker – like bink, with a
similar implementation – was mostly used to encode clips in video
games, where random seeks are rare but looping media are common.

Signed-off-by: Timotej Lazar <timotej.lazar@araneo.si>
This commit is contained in:
Timotej Lazar 2020-06-17 21:45:39 +02:00 committed by Andreas Rheinhardt
parent 7c59e1b0f2
commit edea156579
1 changed files with 26 additions and 0 deletions
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26
libavformat/smacker.c
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@ -349,6 +349,31 @@ next_frame:
return ret;
}
static int smacker_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
SmackerContext *smk = s->priv_data;
int64_t ret;
/* only rewinding to start is supported */
if (timestamp != 0) {
av_log(s, AV_LOG_ERROR,
"Random seeks are not supported (can only seek to start).\n");
return AVERROR(EINVAL);
}
if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0)
return ret;
smk->cur_frame = 0;
smk->next_audio_index = 0;
smk->new_palette = 0;
memset(smk->pal, 0, sizeof(smk->pal));
memset(smk->aud_pts, 0, sizeof(smk->aud_pts));
return 0;
}
AVInputFormat ff_smacker_demuxer = {
.name = "smk",
.long_name = NULL_IF_CONFIG_SMALL("Smacker"),
@ -356,4 +381,5 @@ AVInputFormat ff_smacker_demuxer = {
.read_probe = smacker_probe,
.read_header = smacker_read_header,
.read_packet = smacker_read_packet,
.read_seek = smacker_read_seek,
};