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gst/avi/gstavidemux.c: Catch UNEXPECTED when downstream has reached end of segment in reverse mode.

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Original commit message from CVS:
* gst/avi/gstavidemux.c:
Catch UNEXPECTED when downstream has reached end of
segment in reverse mode.
This commit is contained in:
Thijs Vermeir 2008-06-05 09:45:00 +00:00
parent 8057839bdd
commit 61a15f8c5f
3 changed files with 67 additions and 25 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2008-06-05 Thijs Vermeir <thijsvermeir@gmail.com>
* gst/avi/gstavidemux.c:
Catch UNEXPECTED when downstream has reached end of
segment in reverse mode.
2008-06-04 Thijs Vermeir <thijsvermeir@gmail.com>
* gst/avi/gstavidemux.c:

2
common

@ -1 +1 @@
Subproject commit 130fa8f739ff09aedb520c33239f53d06cfe9bd5
Subproject commit 68fb019d4044b9878aef4ca223fc13c19ffc7d0c

84
gst/avi/gstavidemux.c
View file

@ -140,7 +140,8 @@ gst_avi_demux_base_init (GstAviDemuxClass * klass)
"Demultiplex an avi file into audio and video",
"Erik Walthinsen <omega@cse.ogi.edu>\n"
"Wim Taymans <wim.taymans@chello.be>\n"
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
"Ronald Bultje <rbultje@ronald.bitfreak.net>\n"
"Thijs Vermeir <thijsvermeir@gmail.com>");
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstPadTemplate *videosrctempl, *audiosrctempl, *subsrctempl;
GstCaps *audcaps, *vidcaps, *subcaps;
@ -1693,7 +1694,7 @@ gst_avi_demux_parse_index (GstAviDemux * avi,
stream->total_frames++;
stream->idx_duration = next_ts;
GST_DEBUG_OBJECT (avi,
GST_LOG_OBJECT (avi,
"Adding index entry %d (%6u), flags %02x, stream %d, size %u "
", offset %" G_GUINT64_FORMAT ", time %" GST_TIME_FORMAT ", dur %"
GST_TIME_FORMAT,
@ -2403,7 +2404,7 @@ gst_avi_demux_massage_index (GstAviDemux * avi,
num_per_stream[entry->stream_nr]++;
#endif
GST_DEBUG ("Sorted index entry %3d for stream %d of size %6u"
GST_LOG_OBJECT (avi, "Sorted index entry %3d for stream %d of size %6u"
" at offset %7" G_GUINT64_FORMAT ", time %" GST_TIME_FORMAT
" dur %" GST_TIME_FORMAT,
avi->index_entries[i].index_nr, entry->stream_nr, entry->size,
@ -3447,6 +3448,38 @@ done:
return ret;
}
/*
* prepare the avi element for a reverse jump to a prev keyframe
* this function will return the start entry. if the function returns
* NULL there was no prev keyframe.
*/
static gst_avi_index_entry *
gst_avi_demux_step_reverse (GstAviDemux * avi)
{
gst_avi_index_entry *entry;
gint i;
avi->reverse_stop_index = avi->reverse_start_index;
entry =
gst_avi_demux_index_prev (avi, 0, avi->reverse_stop_index,
GST_AVI_INDEX_ENTRY_FLAG_KEYFRAME);
if (!entry) {
GST_DEBUG_OBJECT (avi, "no valid index entry found index %d",
avi->reverse_stop_index);
return NULL;
}
avi->current_entry = avi->reverse_start_index = entry->index_nr;
GST_DEBUG_OBJECT (avi,
"reverse playback jump: start idx (%d) and stop idx (%d)",
avi->reverse_start_index, avi->reverse_stop_index);
gst_segment_set_last_stop (&avi->segment, GST_FORMAT_TIME, entry->ts);
for (i = 0; i < avi->num_streams; i++) {
avi->stream[i].last_flow = GST_FLOW_OK;
avi->stream[i].discont = TRUE;
}
return entry;
}
/*
* Read data from one index entry
*/
@ -3458,7 +3491,6 @@ gst_avi_demux_process_next_entry (GstAviDemux * avi)
avi_stream_context *stream;
gst_avi_index_entry *entry;
GstBuffer *buf;
gint i;
do {
/* see if we are at the end */
@ -3478,24 +3510,9 @@ gst_avi_demux_process_next_entry (GstAviDemux * avi)
if (avi->index_entries[avi->reverse_start_index].ts < avi->segment.start)
goto eos_reverse_segment;
avi->reverse_stop_index = avi->reverse_start_index;
entry =
gst_avi_demux_index_prev (avi, 0, avi->reverse_stop_index,
GST_AVI_INDEX_ENTRY_FLAG_KEYFRAME);
if (!entry) {
GST_DEBUG_OBJECT (avi, "no valid index entry found index %d",
avi->reverse_stop_index);
if (!(entry = gst_avi_demux_step_reverse (avi)))
goto eos;
}
avi->current_entry = avi->reverse_start_index = entry->index_nr;
GST_DEBUG_OBJECT (avi,
"reverse playback jump: start idx (%d) and stop idx (%d)",
avi->reverse_start_index, avi->reverse_stop_index);
gst_segment_set_last_stop (&avi->segment, GST_FORMAT_TIME, entry->ts);
for (i = 0; i < avi->num_streams; i++) {
avi->stream[i].last_flow = GST_FLOW_OK;
avi->stream[i].discont = TRUE;
}
avi->current_entry++;
}
@ -3574,15 +3591,34 @@ gst_avi_demux_process_next_entry (GstAviDemux * avi)
res = gst_pad_push (stream->pad, buf);
/* combine flows */
res = gst_avi_demux_combine_flows (avi, stream, res);
/* mark as processed, we increment the frame and byte counters then
* leave the while loop and return the GstFlowReturn */
processed = TRUE;
GST_DEBUG_OBJECT (avi, "Processed buffer %d: %s", entry->index_nr,
gst_flow_get_name (res));
if (avi->segment.rate < 0
&& entry->ts > avi->segment.stop && res == GST_FLOW_UNEXPECTED) {
/* In reverse playback we can get a GST_FLOW_UNEXPECTED when
* we are at the end of the segment, so we just need to jump
* back to the previous section.
*/
GST_DEBUG_OBJECT (avi, "downstream has reached end of segment");
if (!(entry = gst_avi_demux_step_reverse (avi)))
goto eos;
res = GST_FLOW_OK;
stream->current_frame = entry->frames_before;
stream->current_byte = entry->bytes_before;
continue;
}
/* combine flows */
res = gst_avi_demux_combine_flows (avi, stream, res);
next:
stream->current_frame = entry->frames_before + 1;
stream->current_byte = entry->bytes_before + entry->size;