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matroskamux: Remove duration accumulation logic

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Duration accumulation can cause rounding errors and generate wrong
duration with different buffers that share the same timestamp.

https://bugzilla.gnome.org/show_bug.cgi?id=745192
This commit is contained in:
Nicola Murino 2015-03-03 19:19:50 +01:00 committed by Sebastian Dröge
parent f727762c1f
commit c4e542de69
2 changed files with 22 additions and 21 deletions
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42
gst/matroska/matroska-mux.c
View file

@ -596,7 +596,6 @@ gst_matroska_pad_reset (GstMatroskaPad * collect_pad, gboolean full)
/* TODO: check default values for the context */
context->flags = GST_MATROSKA_TRACK_ENABLED | GST_MATROSKA_TRACK_DEFAULT;
collect_pad->track = context;
collect_pad->duration = 0;
collect_pad->start_ts = GST_CLOCK_TIME_NONE;
collect_pad->end_ts = GST_CLOCK_TIME_NONE;
collect_pad->tags = gst_tag_list_new_empty ();
@ -2344,18 +2343,21 @@ gst_matroska_mux_release_pad (GstElement * element, GstPad * pad)
GstMatroskaPad *collect_pad = (GstMatroskaPad *) cdata;
if (cdata->pad == pad) {
GstClockTime min_dur; /* observed minimum duration */
/*
* observed duration, this will remain GST_CLOCK_TIME_NONE
* only if the pad is resetted
*/
GstClockTime collected_duration = GST_CLOCK_TIME_NONE;
if (GST_CLOCK_TIME_IS_VALID (collect_pad->start_ts) &&
GST_CLOCK_TIME_IS_VALID (collect_pad->end_ts)) {
min_dur = GST_CLOCK_DIFF (collect_pad->start_ts, collect_pad->end_ts);
if (collect_pad->duration < min_dur)
collect_pad->duration = min_dur;
collected_duration =
GST_CLOCK_DIFF (collect_pad->start_ts, collect_pad->end_ts);
}
if (GST_CLOCK_TIME_IS_VALID (collect_pad->duration) &&
mux->duration < collect_pad->duration)
mux->duration = collect_pad->duration;
if (GST_CLOCK_TIME_IS_VALID (collected_duration)
&& mux->duration < collected_duration)
mux->duration = collected_duration;
break;
}
@ -3159,7 +3161,11 @@ gst_matroska_mux_finish (GstMatroskaMux * mux)
for (collected = mux->collect->data; collected;
collected = g_slist_next (collected)) {
GstMatroskaPad *collect_pad;
GstClockTime min_duration; /* observed minimum duration */
/*
* observed duration, this will never remain GST_CLOCK_TIME_NONE
* since this means buffer without timestamps that is not possibile
*/
GstClockTime collected_duration = GST_CLOCK_TIME_NONE;
collect_pad = (GstMatroskaPad *) collected->data;
@ -3171,18 +3177,18 @@ gst_matroska_mux_finish (GstMatroskaMux * mux)
if (GST_CLOCK_TIME_IS_VALID (collect_pad->start_ts) &&
GST_CLOCK_TIME_IS_VALID (collect_pad->end_ts)) {
min_duration =
collected_duration =
GST_CLOCK_DIFF (collect_pad->start_ts, collect_pad->end_ts);
if (collect_pad->duration < min_duration)
collect_pad->duration = min_duration;
GST_DEBUG_OBJECT (collect_pad,
"final track duration: %" GST_TIME_FORMAT,
GST_TIME_ARGS (collect_pad->duration));
GST_TIME_ARGS (collected_duration));
} else {
GST_WARNING_OBJECT (collect_pad, "unable to get final track duration");
}
if (GST_CLOCK_TIME_IS_VALID (collected_duration) &&
duration < collected_duration)
duration = collected_duration;
if (GST_CLOCK_TIME_IS_VALID (collect_pad->duration) &&
duration < collect_pad->duration)
duration = collect_pad->duration;
}
/* seek back (optional, but do anyway) */
@ -3465,10 +3471,6 @@ gst_matroska_mux_write_data (GstMatroskaMux * mux, GstMatroskaPad * collect_pad,
mux->cluster_time = buffer_timestamp;
}
/* update duration of this track */
if (GST_BUFFER_DURATION_IS_VALID (buf))
collect_pad->duration += GST_BUFFER_DURATION (buf);
/* We currently write index entries for all video tracks or for the audio
* track in a single-track audio file. This could be improved by keeping the
* index only for the *first* video track. */

1
gst/matroska/matroska-mux.h
View file

@ -68,7 +68,6 @@ typedef struct
GstTagList *tags;
guint64 duration;
GstClockTime start_ts;
GstClockTime end_ts; /* last timestamp + (if available) duration */
guint64 default_duration_scaled;