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videotestsrc: implement reverse playback

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Decrement the n_frames counter when doing reverse playback to
have timestamps and offsets reducing instead of increasing

https://bugzilla.gnome.org/show_bug.cgi?id=701813
This commit is contained in:
Thiago Santos 2013-10-08 00:08:34 -03:00 committed by Nicolas Dufresne
parent 9269bee9bd
commit 866f132821
2 changed files with 17 additions and 2 deletions
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18
gst/videotestsrc/gstvideotestsrc.c
View file

@ -813,6 +813,7 @@ gst_video_test_src_do_seek (GstBaseSrc * bsrc, GstSegment * segment)
segment->time = segment->start;
position = segment->position;
src->reverse = segment->rate < 0;
/* now move to the position indicated */
if (src->info.fps_n) {
@ -862,6 +863,11 @@ gst_video_test_src_fill (GstPushSrc * psrc, GstBuffer * buffer)
if (G_UNLIKELY (src->info.fps_n == 0 && src->n_frames == 1))
goto eos;
if (G_UNLIKELY (src->n_frames == -1)) {
/* EOS for reverse playback */
goto eos;
}
GST_LOG_OBJECT (src,
"creating buffer from pool for frame %d", (gint) src->n_frames);
@ -890,12 +896,20 @@ gst_video_test_src_fill (GstPushSrc * psrc, GstBuffer * buffer)
GST_TIME_ARGS (src->timestamp_offset), GST_TIME_ARGS (src->running_time));
GST_BUFFER_OFFSET (buffer) = src->accum_frames + src->n_frames;
src->n_frames++;
if (src->reverse) {
src->n_frames--;
} else {
src->n_frames++;
}
GST_BUFFER_OFFSET_END (buffer) = GST_BUFFER_OFFSET (buffer) + 1;
if (src->info.fps_n) {
next_time = gst_util_uint64_scale_int (src->n_frames * GST_SECOND,
src->info.fps_d, src->info.fps_n);
GST_BUFFER_DURATION (buffer) = next_time - src->running_time;
if (src->reverse) {
GST_BUFFER_DURATION (buffer) = src->running_time - next_time;
} else {
GST_BUFFER_DURATION (buffer) = next_time - src->running_time;
}
} else {
next_time = src->timestamp_offset;
/* NONE means forever */

1
gst/videotestsrc/gstvideotestsrc.h
View file

@ -139,6 +139,7 @@ struct _GstVideoTestSrc {
/* running time and frames for current caps */
GstClockTime running_time; /* total running time */
gint64 n_frames; /* total frames sent */
gboolean reverse;
/* previous caps running time and frames */
GstClockTime accum_rtime; /* accumulated running_time */