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videomaxrate: Make plugin actually work by using an average

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This commit is contained in:
Olivier Crête 2010-06-10 20:08:14 -04:00
parent 599027fe24
commit 6aa71af0ec
2 changed files with 52 additions and 18 deletions
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65
gst/videomaxrate/videomaxrate.c
View file

@ -76,21 +76,25 @@ gst_video_max_rate_class_init (GstVideoMaxRateClass * klass)
{
GstBaseTransformClass *base_class = GST_BASE_TRANSFORM_CLASS (klass);
base_class->transform_caps = gst_video_max_rate_transform_caps;
base_class->set_caps = gst_video_max_rate_set_caps;
base_class->transform_ip = gst_video_max_rate_transform_ip;
base_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_video_max_rate_transform_caps);
base_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_max_rate_set_caps);
base_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_video_max_rate_transform_ip);
}
static void
gst_video_max_rate_init (GstVideoMaxRate * videomaxrate,
GstVideoMaxRateClass * gclass)
{
videomaxrate->to_rate_numerator = -1;
videomaxrate->to_rate_denominator = -1;
videomaxrate->have_last_ts = FALSE;
videomaxrate->last_ts = GST_CLOCK_TIME_NONE;
videomaxrate->average = 0;
videomaxrate->wanted_diff = 0;
gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (videomaxrate), TRUE);
gst_pad_set_event_function (GST_BASE_TRANSFORM_SINK_PAD (videomaxrate),
gst_video_max_rate_sink_event);
GST_DEBUG_FUNCPTR (gst_video_max_rate_sink_event));
}
gboolean
@ -102,7 +106,8 @@ gst_video_max_rate_sink_event (GstPad * pad, GstEvent * event)
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
case GST_EVENT_FLUSH_STOP:
videomaxrate->have_last_ts = FALSE;
videomaxrate->last_ts = GST_CLOCK_TIME_NONE;
videomaxrate->average = 0;
break;
default:
break;
@ -149,8 +154,13 @@ gst_video_max_rate_set_caps (GstBaseTransform * trans, GstCaps * incaps,
if (!gst_structure_get_fraction (cs, "framerate", &numerator, &denominator))
return FALSE;
videomaxrate->to_rate_numerator = numerator;
videomaxrate->to_rate_denominator = denominator;
if (numerator)
videomaxrate->wanted_diff = gst_util_uint64_scale_int (GST_SECOND,
denominator, numerator);
else
videomaxrate->wanted_diff = 0;
videomaxrate->last_ts = GST_CLOCK_TIME_NONE;
videomaxrate->average = 0;
return TRUE;
}
@ -160,18 +170,43 @@ gst_video_max_rate_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (trans);
GstClockTime ts = GST_BUFFER_TIMESTAMP (buf);
const GstClockTime average_period = GST_SECOND;
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf) || videomaxrate->wanted_diff == 0)
return GST_FLOW_OK;
/* drop frames if they exceed our output rate */
if (videomaxrate->have_last_ts) {
if (ts < videomaxrate->last_ts + gst_util_uint64_scale (1,
videomaxrate->to_rate_denominator * GST_SECOND,
videomaxrate->to_rate_numerator)) {
if (GST_CLOCK_TIME_IS_VALID (videomaxrate->last_ts)) {
GstClockTimeDiff diff = ts - videomaxrate->last_ts;
/* Drop buffer if its early compared to the desired frame rate and
* the current average is higher than the desired average
*/
if (diff < videomaxrate->wanted_diff &&
videomaxrate->average < videomaxrate->wanted_diff)
return GST_BASE_TRANSFORM_FLOW_DROPPED;
/* Update average */
if (videomaxrate->average) {
GstClockTimeDiff wanted_diff;
if (G_LIKELY (average_period > videomaxrate->wanted_diff))
wanted_diff = videomaxrate->wanted_diff;
else
wanted_diff = average_period * 10;
videomaxrate->average =
gst_util_uint64_scale_round (videomaxrate->average,
average_period - wanted_diff,
average_period) +
gst_util_uint64_scale_round (diff, wanted_diff,
average_period);
} else {
videomaxrate->average = diff;
}
}
videomaxrate->last_ts = ts;
videomaxrate->have_last_ts = TRUE;
return GST_FLOW_OK;
}

5
gst/videomaxrate/videomaxrate.h
View file

@ -45,11 +45,10 @@ struct _GstVideoMaxRate
{
GstBaseTransform parent;
gint to_rate_numerator;
gint to_rate_denominator;
GstClockTimeDiff wanted_diff;
gboolean have_last_ts;
GstClockTime last_ts;
GstClockTimeDiff average;
};
struct _GstVideoMaxRateClass