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lavf/oggdec: check for begin-of-stream flag in case of chained streams.

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Fix Ticket #1617, revealing a regression I introduced in 8f3eebd.

We need to make sure no stream is added in between Ogg context save and
restore operations (because it would likely lead to a mismatch between
ogg->nstreams and AVFormatContext->nb_streams after the restore op).
This is the reason the ogg->state check is added in ogg_new_stream().
Before this patch, checking for ogg->headers was preventing this:
ogg->headers is always set before any ogg save/restore (though, it was
also preventing from creating the stream when necessary).
This commit is contained in:
Clément Bœsch 2012-09-16 22:24:11 +02:00
parent 405ee405c9
commit ea5bd7ea6f
2 changed files with 22 additions and 1 deletions
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22
libavformat/oggdec.c
View File

@ -139,6 +139,7 @@ static int ogg_reset(AVFormatContext *s)
os->nsegs = 0;
os->segp = 0;
os->incomplete = 0;
os->got_data = 0;
if (start_pos <= s->data_offset) {
os->lastpts = 0;
}
@ -205,6 +206,12 @@ static int ogg_new_stream(AVFormatContext *s, uint32_t serial)
struct ogg_stream *os;
size_t size;
if (ogg->state) {
av_log(s, AV_LOG_ERROR, "New streams are not supposed to be added "
"in between Ogg context save/restore operations.\n");
return AVERROR_BUG;
}
/* Allocate and init a new Ogg Stream */
if (av_size_mult(ogg->nstreams + 1, sizeof(*ogg->streams), &size) < 0 ||
!(os = av_realloc(ogg->streams, size)))
@ -248,6 +255,16 @@ static int ogg_new_buf(struct ogg *ogg, int idx)
return 0;
}
static int data_packets_seen(const struct ogg *ogg)
{
int i;
for (i = 0; i < ogg->nstreams; i++)
if (ogg->streams[i].got_data)
return 1;
return 0;
}
static int ogg_read_page(AVFormatContext *s, int *sid)
{
AVIOContext *bc = s->pb;
@ -297,7 +314,7 @@ static int ogg_read_page(AVFormatContext *s, int *sid)
idx = ogg_find_stream (ogg, serial);
if (idx < 0){
if (ogg->headers)
if (data_packets_seen(ogg))
idx = ogg_replace_stream(s, serial);
else
idx = ogg_new_stream(s, serial);
@ -325,6 +342,9 @@ static int ogg_read_page(AVFormatContext *s, int *sid)
for (i = 0; i < nsegs; i++)
size += os->segments[i];
if (!(flags & OGG_FLAG_BOS))
os->got_data = 1;
if (flags & OGG_FLAG_CONT || os->incomplete){
if (!os->psize){
// If this is the very first segment we started

1
libavformat/oggdec.h
View File

@ -76,6 +76,7 @@ struct ogg_stream {
int page_end; ///< current packet is the last one completed in the page
int keyframe_seek;
int got_start;
int got_data; ///< 1 if the stream got some data (non-initial packets), 0 otherwise
void *private;
};