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ffmpeg
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* Fixing seeking with DV-AVI (by Jeff Downs <heydowns at borg dot com>) 

Originally committed as revision 7439 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik 2007-01-11 22:32:19 +00:00
parent 3dd9fa77bf
commit 6eb2de748d
3 changed files with 38 additions and 11 deletions
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33
libavformat/avidec.c
View File

@ -289,6 +289,8 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
print_tag("strh", tag1, -1);
#endif
if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
int64_t dv_dur;
/*
* After some consideration -- I don't think we
* have to support anything but DV in a type1 AVIs.
@ -314,8 +316,20 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
url_fskip(pb, 3 * 4);
ast->scale = get_le32(pb);
ast->rate = get_le32(pb);
url_fskip(pb, 4); /* start time */
dv_dur = get_le32(pb);
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
dv_dur *= AV_TIME_BASE;
s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
}
/*
* else, leave duration alone; timing estimation in utils.c
* will make a guess based on bit rate.
*/
stream_index = s->nb_streams - 1;
url_fskip(pb, size - 7*4);
url_fskip(pb, size - 9*4);
break;
}
@ -903,6 +917,21 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp
// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
if (ENABLE_DV_DEMUXER && avi->dv_demux) {
/* One and only one real stream for DV in AVI, and it has video */
/* offsets. Calling with other stream indices should have failed */
/* the av_index_search_timestamp call above. */
assert(stream_index == 0);
/* Feed the DV video stream version of the timestamp to the */
/* DV demux so it can synth correct timestamps */
dv_offset_reset(avi->dv_demux, timestamp);
url_fseek(&s->pb, pos, SEEK_SET);
avi->stream_index= -1;
return 0;
}
for(i = 0; i < s->nb_streams; i++) {
AVStream *st2 = s->streams[i];
AVIStream *ast2 = st2->priv_data;
@ -937,8 +966,6 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp
ast2->frame_offset *=ast2->sample_size;
}
if (ENABLE_DV_DEMUXER && avi->dv_demux)
dv_flush_audio_packets(avi->dv_demux);
/* do the seek */
url_fseek(&s->pb, pos, SEEK_SET);
avi->stream_index= -1;

14
libavformat/dv.c
View File

@ -358,8 +358,13 @@ static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
return offset;
}
void dv_flush_audio_packets(DVDemuxContext *c)
void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
{
c->frames= frame_offset;
if (c->ach)
c->abytes= av_rescale(c->frames,
c->ast[0]->codec->bit_rate * (int64_t)c->sys->frame_rate_base,
8*c->sys->frame_rate);
c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
}
@ -419,13 +424,8 @@ static int dv_read_seek(AVFormatContext *s, int stream_index,
DVDemuxContext *c = r->dv_demux;
int64_t offset= dv_frame_offset(s, c, timestamp, flags);
c->frames= offset / c->sys->frame_size;
if (c->ach)
c->abytes= av_rescale(c->frames,
c->ast[0]->codec->bit_rate * (int64_t)c->sys->frame_rate_base,
8*c->sys->frame_rate);
dv_offset_reset(c, offset / c->sys->frame_size);
dv_flush_audio_packets(c);
return url_fseek(&s->pb, offset, SEEK_SET);
}

2
libavformat/dv.h
View File

@ -29,7 +29,7 @@ typedef struct DVDemuxContext DVDemuxContext;
DVDemuxContext* dv_init_demux(AVFormatContext* s);
int dv_get_packet(DVDemuxContext*, AVPacket *);
int dv_produce_packet(DVDemuxContext*, AVPacket*, uint8_t*, int);
void dv_flush_audio_packets(DVDemuxContext*);
void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset);
typedef struct DVMuxContext DVMuxContext;
DVMuxContext* dv_init_mux(AVFormatContext* s);