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idcin: allow seeking back to the first packet

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Also, do not allow seek-by-byte, as there is no way to find the next packet
boundary.
This commit is contained in:
Justin Ruggles 2012-08-01 17:14:39 -04:00
parent 49543373f3
commit 7040e479a1
1 changed files with 21 additions and 0 deletions
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21
libavformat/idcin.c
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@ -88,6 +88,7 @@ typedef struct IdcinDemuxContext {
int current_audio_chunk;
int next_chunk_is_video;
int audio_present;
int64_t first_pkt_pos;
} IdcinDemuxContext;
static int idcin_probe(AVProbeData *p)
@ -230,6 +231,7 @@ static int idcin_read_header(AVFormatContext *s)
}
idcin->next_chunk_is_video = 1;
idcin->first_pkt_pos = avio_tell(s->pb);
return 0;
}
@ -315,6 +317,23 @@ static int idcin_read_packet(AVFormatContext *s,
return ret;
}
static int idcin_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
IdcinDemuxContext *idcin = s->priv_data;
if (idcin->first_pkt_pos > 0) {
int ret = avio_seek(s->pb, idcin->first_pkt_pos, SEEK_SET);
if (ret < 0)
return ret;
ff_update_cur_dts(s, s->streams[idcin->video_stream_index], 0);
idcin->next_chunk_is_video = 1;
idcin->current_audio_chunk = 0;
return 0;
}
return -1;
}
AVInputFormat ff_idcin_demuxer = {
.name = "idcin",
.long_name = NULL_IF_CONFIG_SMALL("id Cinematic"),
@ -322,4 +341,6 @@ AVInputFormat ff_idcin_demuxer = {
.read_probe = idcin_probe,
.read_header = idcin_read_header,
.read_packet = idcin_read_packet,
.read_seek = idcin_read_seek,
.flags = AVFMT_NO_BYTE_SEEK,
};