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qtdemux: improve framerate determining

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Collect a limited number of starting sample durations and use the median of
those to determine caps framerate.
This commit is contained in:
Mark Nauwelaerts 2010-08-16 16:08:04 +02:00
parent 13b553bce7
commit 713719f705
1 changed files with 23 additions and 6 deletions
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29
gst/qtdemux/qtdemux.c
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@ -4511,10 +4511,6 @@ done2:
GST_LOG_OBJECT (qtdemux, "block %d, %u timestamps, duration %u",
i, stream->stts_samples, stream->stts_duration);
/* take first duration for fps */
if (G_UNLIKELY (stream->min_duration == 0))
stream->min_duration = stream->stts_duration;
stream->stts_sample_index = 0;
}
@ -5093,6 +5089,15 @@ avc_get_profile_and_level_string (const guint8 * avc_data, gint size,
QT_UINT8 (avc_data + 2));
}
static gint
less_than (gconstpointer a, gconstpointer b)
{
const guint32 *av = a, *bv = b;
return *av - *bv;
}
/* parse the traks.
* With each track we associate a new QtDemuxStream that contains all the info
* about the trak.
@ -6084,15 +6089,27 @@ qtdemux_parse_trak (GstQTDemux * qtdemux, GNode * trak)
|| !qtdemux_parse_samples (qtdemux, stream, 0))
goto samples_failed;
/* look for non-zero min_duration as it is used to set the frame rate cap */
/* parse number of initial sample to set frame rate cap */
if (G_UNLIKELY (stream->min_duration == 0)) {
guint32 sample_num = 1;
const guint samples = 20;
GArray *durations;
while (sample_num < stream->n_samples && stream->min_duration == 0) {
while (sample_num < stream->n_samples && sample_num < samples) {
if (!qtdemux_parse_samples (qtdemux, stream, sample_num))
goto samples_failed;
++sample_num;
}
/* collect and sort durations */
durations = g_array_sized_new (FALSE, FALSE, sizeof (guint32), samples);
sample_num = 0;
while (sample_num <= stream->stbl_index) {
g_array_append_val (durations, stream->samples[sample_num].duration);
sample_num++;
}
g_array_sort (durations, less_than);
stream->min_duration = g_array_index (durations, guint32, samples / 2);
g_array_unref (durations);
}
/* configure segments */
if (!qtdemux_parse_segments (qtdemux, stream, trak))