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gstreamer/gst/videorate/gstvideorate.c
George Kiagiadakis c84f911cee videorate: update the caps framerate only in the GST_PAD_SINK transform_caps direction 
When a stream has a variable framerate, videorate calculates it and
forces it on the output caps. However, the code in _transform_caps()
currently also does that if the transform is going in the opposite
direction (GST_PAD_SRC), so during a renegotiation it tries to force
upstream to use the calculated framerate and it fails.

https://bugzilla.gnome.org/show_bug.cgi?id=750032
2015-05-29 15:03:05 +02:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-videorate
*
* This element takes an incoming stream of timestamped video frames.
* It will produce a perfect stream that matches the source pad's framerate.
*
* The correction is performed by dropping and duplicating frames, no fancy
* algorithm is used to interpolate frames (yet).
*
* By default the element will simply negotiate the same framerate on its
* source and sink pad.
*
* This operation is useful to link to elements that require a perfect stream.
* Typical examples are formats that do not store timestamps for video frames,
* but only store a framerate, like Ogg and AVI.
*
* A conversion to a specific framerate can be forced by using filtered caps on
* the source pad.
*
* The properties #GstVideoRate:in, #GstVideoRate:out, #GstVideoRate:duplicate
* and #GstVideoRate:drop can be read to obtain information about number of
* input frames, output frames, dropped frames (i.e. the number of unused input
* frames) and duplicated frames (i.e. the number of times an input frame was
* duplicated, beside being used normally).
*
* An input stream that needs no adjustments will thus never have dropped or
* duplicated frames.
*
* When the #GstVideoRate:silent property is set to FALSE, a GObject property
* notification will be emitted whenever one of the #GstVideoRate:duplicate or
* #GstVideoRate:drop values changes.
* This can potentially cause performance degradation.
* Note that property notification will happen from the streaming thread, so
* applications should be prepared for this.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch-1.0 -v uridecodebin uri=file:///path/to/video.ogg ! videoconvert ! videoscale ! videorate ! video/x-raw,framerate=15/1 ! autovideosink
* ]| Decode a video file and adjust the framerate to 15 fps before playing.
* To create a test Ogg/Theora file refer to the documentation of theoraenc.
* |[
* gst-launch-1.0 -v v4l2src ! videorate ! video/x-raw,framerate=25/2 ! theoraenc ! oggmux ! filesink location=recording.ogg
* ]| Capture video from a V4L device, and adjust the stream to 12.5 fps before
* encoding to Ogg/Theora.
* |[
* gst-launch-1.0 -v uridecodebin uri=file:///path/to/video.ogg ! videoconvert ! videoscale ! videorate ! video/x-raw,framerate=1/5 ! jpegenc ! multifilesink location=snapshot-%05d.jpg
* ]| Decode a video file and save a snapshot every 5 seconds as consecutively numbered jpeg file.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvideorate.h"
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_STATIC (video_rate_debug);
#define GST_CAT_DEFAULT video_rate_debug
/* GstVideoRate signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_SILENT TRUE
#define DEFAULT_NEW_PREF 1.0
#define DEFAULT_SKIP_TO_FIRST FALSE
#define DEFAULT_DROP_ONLY FALSE
#define DEFAULT_AVERAGE_PERIOD 0
#define DEFAULT_MAX_RATE G_MAXINT
enum
{
PROP_0,
PROP_IN,
PROP_OUT,
PROP_DUP,
PROP_DROP,
PROP_SILENT,
PROP_NEW_PREF,
PROP_SKIP_TO_FIRST,
PROP_DROP_ONLY,
PROP_AVERAGE_PERIOD,
PROP_MAX_RATE
};
static GstStaticPadTemplate gst_video_rate_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(ANY);" "image/jpeg(ANY);" "image/png(ANY)")
);
static GstStaticPadTemplate gst_video_rate_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(ANY);" "image/jpeg(ANY);" "image/png(ANY)")
);
static void gst_video_rate_swap_prev (GstVideoRate * videorate,
GstBuffer * buffer, gint64 time);
static gboolean gst_video_rate_sink_event (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_video_rate_query (GstBaseTransform * trans,
GstPadDirection direction, GstQuery * query);
static gboolean gst_video_rate_setcaps (GstBaseTransform * trans,
GstCaps * in_caps, GstCaps * out_caps);
static GstCaps *gst_video_rate_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static GstCaps *gst_video_rate_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstFlowReturn gst_video_rate_transform_ip (GstBaseTransform * trans,
GstBuffer * buf);
static gboolean gst_video_rate_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query);
static gboolean gst_video_rate_start (GstBaseTransform * trans);
static gboolean gst_video_rate_stop (GstBaseTransform * trans);
static void gst_video_rate_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_video_rate_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GParamSpec *pspec_drop = NULL;
static GParamSpec *pspec_duplicate = NULL;
#define gst_video_rate_parent_class parent_class
G_DEFINE_TYPE (GstVideoRate, gst_video_rate, GST_TYPE_BASE_TRANSFORM);
static void
gst_video_rate_class_init (GstVideoRateClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseTransformClass *base_class = GST_BASE_TRANSFORM_CLASS (klass);
object_class->set_property = gst_video_rate_set_property;
object_class->get_property = gst_video_rate_get_property;
base_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_rate_setcaps);
base_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_video_rate_transform_caps);
base_class->transform_ip = GST_DEBUG_FUNCPTR (gst_video_rate_transform_ip);
base_class->sink_event = GST_DEBUG_FUNCPTR (gst_video_rate_sink_event);
base_class->start = GST_DEBUG_FUNCPTR (gst_video_rate_start);
base_class->stop = GST_DEBUG_FUNCPTR (gst_video_rate_stop);
base_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_video_rate_fixate_caps);
base_class->query = GST_DEBUG_FUNCPTR (gst_video_rate_query);
base_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_video_rate_propose_allocation);
g_object_class_install_property (object_class, PROP_IN,
g_param_spec_uint64 ("in", "In",
"Number of input frames", 0, G_MAXUINT64, 0,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_OUT,
g_param_spec_uint64 ("out", "Out", "Number of output frames", 0,
G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
pspec_duplicate = g_param_spec_uint64 ("duplicate", "Duplicate",
"Number of duplicated frames", 0, G_MAXUINT64, 0,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
g_object_class_install_property (object_class, PROP_DUP, pspec_duplicate);
pspec_drop = g_param_spec_uint64 ("drop", "Drop", "Number of dropped frames",
0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
g_object_class_install_property (object_class, PROP_DROP, pspec_drop);
g_object_class_install_property (object_class, PROP_SILENT,
g_param_spec_boolean ("silent", "silent",
"Don't emit notify for dropped and duplicated frames", DEFAULT_SILENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_NEW_PREF,
g_param_spec_double ("new-pref", "New Pref",
"Value indicating how much to prefer new frames (unused)", 0.0, 1.0,
DEFAULT_NEW_PREF, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstVideoRate:skip-to-first:
*
* Don't produce buffers before the first one we receive.
*/
g_object_class_install_property (object_class, PROP_SKIP_TO_FIRST,
g_param_spec_boolean ("skip-to-first", "Skip to first buffer",
"Don't produce buffers before the first one we receive",
DEFAULT_SKIP_TO_FIRST, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstVideoRate:drop-only:
*
* Only drop frames, no duplicates are produced.
*/
g_object_class_install_property (object_class, PROP_DROP_ONLY,
g_param_spec_boolean ("drop-only", "Only Drop",
"Only drop frames, no duplicates are produced",
DEFAULT_DROP_ONLY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstVideoRate:average-period:
*
* Arrange for maximum framerate by dropping frames beyond a certain framerate,
* where the framerate is calculated using a moving average over the
* configured.
*/
g_object_class_install_property (object_class, PROP_AVERAGE_PERIOD,
g_param_spec_uint64 ("average-period", "Period over which to average",
"Period over which to average the framerate (in ns) (0 = disabled)",
0, G_MAXINT64, DEFAULT_AVERAGE_PERIOD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstVideoRate:max-rate:
*
* maximum framerate to pass through
*/
g_object_class_install_property (object_class, PROP_MAX_RATE,
g_param_spec_int ("max-rate", "maximum framerate",
"Maximum framerate allowed to pass through "
"(in frames per second, implies drop-only)",
1, G_MAXINT, DEFAULT_MAX_RATE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (element_class,
"Video rate adjuster", "Filter/Effect/Video",
"Drops/duplicates/adjusts timestamps on video frames to make a perfect stream",
"Wim Taymans <wim@fluendo.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_rate_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_rate_src_template));
}
static void
gst_value_fraction_get_extremes (const GValue * v,
gint * min_num, gint * min_denom, gint * max_num, gint * max_denom)
{
if (GST_VALUE_HOLDS_FRACTION (v)) {
*min_num = *max_num = gst_value_get_fraction_numerator (v);
*min_denom = *max_denom = gst_value_get_fraction_denominator (v);
} else if (GST_VALUE_HOLDS_FRACTION_RANGE (v)) {
const GValue *min, *max;
min = gst_value_get_fraction_range_min (v);
*min_num = gst_value_get_fraction_numerator (min);
*min_denom = gst_value_get_fraction_denominator (min);
max = gst_value_get_fraction_range_max (v);
*max_num = gst_value_get_fraction_numerator (max);
*max_denom = gst_value_get_fraction_denominator (max);
} else if (GST_VALUE_HOLDS_LIST (v)) {
gint min_n = G_MAXINT, min_d = 1, max_n = 0, max_d = 1;
int i, n;
*min_num = G_MAXINT;
*min_denom = 1;
*max_num = 0;
*max_denom = 1;
n = gst_value_list_get_size (v);
g_assert (n > 0);
for (i = 0; i < n; i++) {
const GValue *t = gst_value_list_get_value (v, i);
gst_value_fraction_get_extremes (t, &min_n, &min_d, &max_n, &max_d);
if (gst_util_fraction_compare (min_n, min_d, *min_num, *min_denom) < 0) {
*min_num = min_n;
*min_denom = min_d;
}
if (gst_util_fraction_compare (max_n, max_d, *max_num, *max_denom) > 0) {
*max_num = max_n;
*max_denom = max_d;
}
}
} else {
g_warning ("Unknown type for framerate");
*min_num = 0;
*min_denom = 1;
*max_num = G_MAXINT;
*max_denom = 1;
}
}
/* Clamp the framerate in a caps structure to be a smaller range then
* [1...max_rate], otherwise return false */
static gboolean
gst_video_max_rate_clamp_structure (GstStructure * s, gint maxrate,
gint * min_num, gint * min_denom, gint * max_num, gint * max_denom)
{
gboolean ret = FALSE;
if (!gst_structure_has_field (s, "framerate")) {
/* No framerate field implies any framerate, clamping would result in
* [1..max_rate] so not a real subset */
goto out;
} else {
const GValue *v;
GValue intersection = { 0, };
GValue clamp = { 0, };
gint tmp_num, tmp_denom;
g_value_init (&clamp, GST_TYPE_FRACTION_RANGE);
gst_value_set_fraction_range_full (&clamp, 0, 1, maxrate, 1);
v = gst_structure_get_value (s, "framerate");
ret = gst_value_intersect (&intersection, v, &clamp);
g_value_unset (&clamp);
if (!ret)
goto out;
gst_value_fraction_get_extremes (&intersection,
min_num, min_denom, max_num, max_denom);
gst_value_fraction_get_extremes (v,
&tmp_num, &tmp_denom, max_num, max_denom);
if (gst_util_fraction_compare (*max_num, *max_denom, maxrate, 1) > 0) {
*max_num = maxrate;
*max_denom = 1;
}
gst_structure_take_value (s, "framerate", &intersection);
}
out:
return ret;
}
static GstCaps *
gst_video_rate_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstVideoRate *videorate = GST_VIDEO_RATE (trans);
GstCaps *ret;
GstStructure *s, *s1, *s2, *s3 = NULL;
int maxrate = g_atomic_int_get (&videorate->max_rate);
gint i;
ret = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (caps); i++) {
s = gst_caps_get_structure (caps, i);
s1 = gst_structure_copy (s);
if (videorate->updating_caps && direction == GST_PAD_SINK) {
GST_INFO_OBJECT (trans,
"Only updating caps %" GST_PTR_FORMAT " with framerate" " %d/%d",
caps, videorate->to_rate_numerator, videorate->to_rate_denominator);
gst_structure_set (s1, "framerate", GST_TYPE_FRACTION,
videorate->to_rate_numerator, videorate->to_rate_denominator, NULL);
ret = gst_caps_merge_structure (ret, s1);
continue;
}
s2 = gst_structure_copy (s);
s3 = NULL;
if (videorate->drop_only) {
gint min_num = 0, min_denom = 1;
gint max_num = G_MAXINT, max_denom = 1;
/* Clamp the caps to our maximum rate as the first caps if possible */
if (!gst_video_max_rate_clamp_structure (s1, maxrate,
&min_num, &min_denom, &max_num, &max_denom)) {
min_num = 0;
min_denom = 1;
max_num = maxrate;
max_denom = 1;
/* clamp wouldn't be a real subset of 1..maxrate, in this case the sink
* caps should become [1..maxrate], [1..maxint] and the src caps just
* [1..maxrate]. In case there was a caps incompatibility things will
* explode later as appropriate :)
*
* In case [X..maxrate] == [X..maxint], skip as we'll set it later
*/
if (direction == GST_PAD_SRC && maxrate != G_MAXINT)
gst_structure_set (s1, "framerate", GST_TYPE_FRACTION_RANGE,
min_num, min_denom, maxrate, 1, NULL);
else {
gst_structure_free (s1);
s1 = NULL;
}
}
if (direction == GST_PAD_SRC) {
/* We can accept anything as long as it's at least the minimal framerate
* the the sink needs */
gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE,
min_num, min_denom, G_MAXINT, 1, NULL);
/* Also allow unknown framerate, if it isn't already */
if (min_num != 0 || min_denom != 1) {
s3 = gst_structure_copy (s);
gst_structure_set (s3, "framerate", GST_TYPE_FRACTION, 0, 1, NULL);
}
} else if (max_num != 0 || max_denom != 1) {
/* We can provide everything upto the maximum framerate at the src */
gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE,
0, 1, max_num, max_denom, NULL);
}
} else if (direction == GST_PAD_SINK) {
gint min_num = 0, min_denom = 1;
gint max_num = G_MAXINT, max_denom = 1;
if (!gst_video_max_rate_clamp_structure (s1, maxrate,
&min_num, &min_denom, &max_num, &max_denom)) {
gst_structure_free (s1);
s1 = NULL;
}
gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1,
maxrate, 1, NULL);
} else {
/* set the framerate as a range */
gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1,
G_MAXINT, 1, NULL);
}
if (s1 != NULL)
ret = gst_caps_merge_structure_full (ret, s1,
gst_caps_features_copy (gst_caps_get_features (caps, i)));
ret = gst_caps_merge_structure_full (ret, s2,
gst_caps_features_copy (gst_caps_get_features (caps, i)));
if (s3 != NULL)
ret = gst_caps_merge_structure_full (ret, s3,
gst_caps_features_copy (gst_caps_get_features (caps, i)));
}
if (filter) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, ret, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (ret);
ret = intersection;
}
return ret;
}
static GstCaps *
gst_video_rate_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
GstStructure *s;
gint num, denom;
s = gst_caps_get_structure (caps, 0);
if (G_UNLIKELY (!gst_structure_get_fraction (s, "framerate", &num, &denom)))
return othercaps;
othercaps = gst_caps_truncate (othercaps);
othercaps = gst_caps_make_writable (othercaps);
s = gst_caps_get_structure (othercaps, 0);
gst_structure_fixate_field_nearest_fraction (s, "framerate", num, denom);
return othercaps;
}
static gboolean
gst_video_rate_setcaps (GstBaseTransform * trans, GstCaps * in_caps,
GstCaps * out_caps)
{
GstVideoRate *videorate = GST_VIDEO_RATE (trans);
GstStructure *structure;
gboolean ret = TRUE;
gint rate_numerator, rate_denominator;
GST_DEBUG_OBJECT (trans, "setcaps called in: %" GST_PTR_FORMAT
" out: %" GST_PTR_FORMAT, in_caps, out_caps);
structure = gst_caps_get_structure (in_caps, 0);
if (!gst_structure_get_fraction (structure, "framerate",
&rate_numerator, &rate_denominator))
goto no_framerate;
videorate->from_rate_numerator = rate_numerator;
videorate->from_rate_denominator = rate_denominator;
structure = gst_caps_get_structure (out_caps, 0);
if (!gst_structure_get_fraction (structure, "framerate",
&rate_numerator, &rate_denominator))
goto no_framerate;
/* out_frame_count is scaled by the frame rate caps when calculating next_ts.
* when the frame rate caps change, we must update base_ts and reset
* out_frame_count */
if (videorate->to_rate_numerator) {
videorate->base_ts +=
gst_util_uint64_scale (videorate->out_frame_count,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
}
videorate->out_frame_count = 0;
videorate->to_rate_numerator = rate_numerator;
videorate->to_rate_denominator = rate_denominator;
if (rate_numerator)
videorate->wanted_diff = gst_util_uint64_scale_int (GST_SECOND,
rate_denominator, rate_numerator);
else
videorate->wanted_diff = 0;
done:
/* After a setcaps, our caps may have changed. In that case, we can't use
* the old buffer, if there was one (it might have different dimensions) */
GST_DEBUG_OBJECT (videorate, "swapping old buffers");
gst_video_rate_swap_prev (videorate, NULL, GST_CLOCK_TIME_NONE);
videorate->last_ts = GST_CLOCK_TIME_NONE;
videorate->average = 0;
return ret;
no_framerate:
{
GST_DEBUG_OBJECT (videorate, "no framerate specified");
ret = FALSE;
goto done;
}
}
static void
gst_video_rate_reset (GstVideoRate * videorate)
{
GST_DEBUG_OBJECT (videorate, "resetting internal variables");
videorate->in = 0;
videorate->out = 0;
videorate->base_ts = 0;
videorate->out_frame_count = 0;
videorate->drop = 0;
videorate->dup = 0;
videorate->next_ts = GST_CLOCK_TIME_NONE;
videorate->last_ts = GST_CLOCK_TIME_NONE;
videorate->discont = TRUE;
videorate->average = 0;
videorate->force_variable_rate = FALSE;
gst_video_rate_swap_prev (videorate, NULL, 0);
gst_segment_init (&videorate->segment, GST_FORMAT_TIME);
}
static void
gst_video_rate_init (GstVideoRate * videorate)
{
gst_video_rate_reset (videorate);
videorate->silent = DEFAULT_SILENT;
videorate->new_pref = DEFAULT_NEW_PREF;
videorate->drop_only = DEFAULT_DROP_ONLY;
videorate->average_period = DEFAULT_AVERAGE_PERIOD;
videorate->average_period_set = DEFAULT_AVERAGE_PERIOD;
videorate->max_rate = DEFAULT_MAX_RATE;
videorate->from_rate_numerator = 0;
videorate->from_rate_denominator = 0;
videorate->to_rate_numerator = 0;
videorate->to_rate_denominator = 0;
gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (videorate), TRUE);
}
/* flush the oldest buffer */
static GstFlowReturn
gst_video_rate_flush_prev (GstVideoRate * videorate, gboolean duplicate)
{
GstFlowReturn res;
GstBuffer *outbuf;
GstClockTime push_ts;
if (!videorate->prevbuf)
goto eos_before_buffers;
/* make sure we can write to the metadata */
outbuf = gst_buffer_make_writable (gst_buffer_ref (videorate->prevbuf));
GST_BUFFER_OFFSET (outbuf) = videorate->out;
GST_BUFFER_OFFSET_END (outbuf) = videorate->out + 1;
if (videorate->discont) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
videorate->discont = FALSE;
} else
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DISCONT);
if (duplicate)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);
else
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_GAP);
/* this is the timestamp we put on the buffer */
push_ts = videorate->next_ts;
videorate->out++;
videorate->out_frame_count++;
if (videorate->to_rate_numerator) {
/* interpolate next expected timestamp in the segment */
videorate->next_ts =
videorate->segment.base + videorate->segment.start +
videorate->base_ts + gst_util_uint64_scale (videorate->out_frame_count,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
GST_BUFFER_DURATION (outbuf) = videorate->next_ts - push_ts;
} else if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (outbuf))) {
videorate->next_ts = GST_BUFFER_PTS (outbuf) + GST_BUFFER_DURATION (outbuf);
}
/* We do not need to update time in VFR (variable frame rate) mode */
if (!videorate->drop_only) {
/* adapt for looping, bring back to time in current segment. */
GST_BUFFER_TIMESTAMP (outbuf) = push_ts - videorate->segment.base;
}
GST_LOG_OBJECT (videorate,
"old is best, dup, pushing buffer outgoing ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (push_ts));
res = gst_pad_push (GST_BASE_TRANSFORM_SRC_PAD (videorate), outbuf);
return res;
/* WARNINGS */
eos_before_buffers:
{
GST_INFO_OBJECT (videorate, "got EOS before any buffer was received");
return GST_FLOW_OK;
}
}
static void
gst_video_rate_swap_prev (GstVideoRate * videorate, GstBuffer * buffer,
gint64 time)
{
GST_LOG_OBJECT (videorate, "swap_prev: storing buffer %p in prev", buffer);
if (videorate->prevbuf)
gst_buffer_unref (videorate->prevbuf);
videorate->prevbuf = buffer != NULL ? gst_buffer_ref (buffer) : NULL;
videorate->prev_ts = time;
}
static void
gst_video_rate_notify_drop (GstVideoRate * videorate)
{
g_object_notify_by_pspec ((GObject *) videorate, pspec_drop);
}
static void
gst_video_rate_notify_duplicate (GstVideoRate * videorate)
{
g_object_notify_by_pspec ((GObject *) videorate, pspec_duplicate);
}
#define MAGIC_LIMIT 25
static gboolean
gst_video_rate_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstVideoRate *videorate;
videorate = GST_VIDEO_RATE (trans);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
{
const GstSegment *segment;
gst_event_parse_segment (event, &segment);
if (segment->format != GST_FORMAT_TIME)
goto format_error;
GST_DEBUG_OBJECT (videorate, "handle NEWSEGMENT");
/* close up the previous segment, if appropriate */
if (videorate->prevbuf) {
gint count = 0;
GstFlowReturn res;
res = GST_FLOW_OK;
/* fill up to the end of current segment,
* or only send out the stored buffer if there is no specific stop.
* regardless, prevent going loopy in strange cases */
while (res == GST_FLOW_OK && count <= MAGIC_LIMIT &&
((GST_CLOCK_TIME_IS_VALID (videorate->segment.stop) &&
videorate->next_ts - videorate->segment.base
< videorate->segment.stop)
|| count < 1)) {
res = gst_video_rate_flush_prev (videorate, count > 0);
count++;
}
if (count > 1) {
videorate->dup += count - 1;
if (!videorate->silent)
gst_video_rate_notify_duplicate (videorate);
} else if (count == 0) {
videorate->drop++;
if (!videorate->silent)
gst_video_rate_notify_drop (videorate);
}
/* clean up for the new one; _chain will resume from the new start */
gst_video_rate_swap_prev (videorate, NULL, 0);
}
videorate->base_ts = 0;
videorate->out_frame_count = 0;
videorate->next_ts = GST_CLOCK_TIME_NONE;
/* We just want to update the accumulated stream_time */
gst_segment_copy_into (segment, &videorate->segment);
GST_DEBUG_OBJECT (videorate, "updated segment: %" GST_SEGMENT_FORMAT,
&videorate->segment);
break;
}
case GST_EVENT_EOS:{
gint count = 0;
GstFlowReturn res = GST_FLOW_OK;
GST_DEBUG_OBJECT (videorate, "Got EOS");
/* If the segment has a stop position, fill the segment */
if (GST_CLOCK_TIME_IS_VALID (videorate->segment.stop)) {
/* fill up to the end of current segment,
* or only send out the stored buffer if there is no specific stop.
* regardless, prevent going loopy in strange cases */
while (res == GST_FLOW_OK && count <= MAGIC_LIMIT &&
((videorate->next_ts - videorate->segment.base <
videorate->segment.stop)
|| count < 1)) {
res = gst_video_rate_flush_prev (videorate, count > 0);
count++;
}
} else if (videorate->prevbuf) {
/* Output at least one frame but if the buffer duration is valid, output
* enough frames to use the complete buffer duration */
if (GST_BUFFER_DURATION_IS_VALID (videorate->prevbuf)) {
GstClockTime end_ts =
videorate->next_ts + GST_BUFFER_DURATION (videorate->prevbuf);
while (res == GST_FLOW_OK && count <= MAGIC_LIMIT &&
((videorate->next_ts - videorate->segment.base < end_ts)
|| count < 1)) {
res = gst_video_rate_flush_prev (videorate, count > 0);
count++;
}
} else {
res = gst_video_rate_flush_prev (videorate, FALSE);
count = 1;
}
}
if (count > 1) {
videorate->dup += count - 1;
if (!videorate->silent)
gst_video_rate_notify_duplicate (videorate);
} else if (count == 0) {
videorate->drop++;
if (!videorate->silent)
gst_video_rate_notify_drop (videorate);
}
break;
}
case GST_EVENT_FLUSH_STOP:
/* also resets the segment */
GST_DEBUG_OBJECT (videorate, "Got FLUSH_STOP");
gst_video_rate_reset (videorate);
break;
case GST_EVENT_GAP:
/* no gaps after videorate, ignore the event */
gst_event_unref (event);
return TRUE;
default:
break;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
/* ERRORS */
format_error:
{
GST_WARNING_OBJECT (videorate,
"Got segment but doesn't have GST_FORMAT_TIME value");
return FALSE;
}
}
static gboolean
gst_video_rate_query (GstBaseTransform * trans, GstPadDirection direction,
GstQuery * query)
{
GstVideoRate *videorate = GST_VIDEO_RATE (trans);
gboolean res = FALSE;
GstPad *otherpad;
otherpad = (direction == GST_PAD_SRC) ?
GST_BASE_TRANSFORM_SINK_PAD (trans) : GST_BASE_TRANSFORM_SRC_PAD (trans);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
GstClockTime min, max;
gboolean live;
guint64 latency;
guint64 avg_period;
gboolean drop_only;
GstPad *peer;
GST_OBJECT_LOCK (videorate);
avg_period = videorate->average_period_set;
drop_only = videorate->drop_only;
GST_OBJECT_UNLOCK (videorate);
if (avg_period == 0 && (peer = gst_pad_get_peer (otherpad))) {
if ((res = gst_pad_query (peer, query))) {
gst_query_parse_latency (query, &live, &min, &max);
GST_DEBUG_OBJECT (videorate, "Peer latency: min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min), GST_TIME_ARGS (max));
/* Drop only has no latency, other modes have one frame latency */
if (!drop_only && videorate->from_rate_numerator != 0) {
/* add latency. We don't really know since we hold on to the frames
* until we get a next frame, which can be anything. We assume
* however that this will take from_rate time. */
latency = gst_util_uint64_scale (GST_SECOND,
videorate->from_rate_denominator,
videorate->from_rate_numerator);
} else {
/* no input framerate, we don't know */
latency = 0;
}
GST_DEBUG_OBJECT (videorate, "Our latency: %"
GST_TIME_FORMAT, GST_TIME_ARGS (latency));
min += latency;
if (max != -1)
max += latency;
GST_DEBUG_OBJECT (videorate, "Calculated total latency : min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min), GST_TIME_ARGS (max));
gst_query_set_latency (query, live, min, max);
}
gst_object_unref (peer);
break;
}
/* Simple fallthrough if we don't have a latency or not a peer that we
* can't ask about its latency yet.. */
}
default:
res =
GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction,
query);
break;
}
return res;
}
static gboolean
gst_video_rate_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query)
{
GstBaseTransformClass *klass = GST_BASE_TRANSFORM_CLASS (parent_class);
gboolean res;
/* We should always be passthrough */
g_return_val_if_fail (decide_query == NULL, FALSE);
res = klass->propose_allocation (trans, NULL, query);
if (res) {
guint i = 0;
guint n_allocation;
guint down_min = 0;
n_allocation = gst_query_get_n_allocation_pools (query);
while (i < n_allocation) {
GstBufferPool *pool = NULL;
guint size, min, max;
gst_query_parse_nth_allocation_pool (query, i, &pool, &size, &min, &max);
if (min == max) {
if (pool)
gst_object_unref (pool);
gst_query_remove_nth_allocation_pool (query, i);
n_allocation--;
down_min = MAX (min, down_min);
continue;
}
gst_query_set_nth_allocation_pool (query, i, pool, size, min + 1, max);
if (pool)
gst_object_unref (pool);
i++;
}
if (n_allocation == 0) {
GstCaps *caps;
GstVideoInfo info;
gst_query_parse_allocation (query, &caps, NULL);
gst_video_info_from_caps (&info, caps);
gst_query_add_allocation_pool (query, NULL, info.size, down_min + 1, 0);
}
}
return res;
}
static GstFlowReturn
gst_video_rate_trans_ip_max_avg (GstVideoRate * videorate, GstBuffer * buf)
{
GstClockTime ts = GST_BUFFER_TIMESTAMP (buf);
videorate->in++;
if (!GST_CLOCK_TIME_IS_VALID (ts) || videorate->wanted_diff == 0)
goto push;
/* drop frames if they exceed our output rate */
if (GST_CLOCK_TIME_IS_VALID (videorate->last_ts)) {
GstClockTimeDiff diff = ts - videorate->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 < videorate->wanted_diff &&
videorate->average < videorate->wanted_diff)
goto drop;
/* Update average */
if (videorate->average) {
GstClockTimeDiff wanted_diff;
if (G_LIKELY (videorate->average_period > videorate->wanted_diff))
wanted_diff = videorate->wanted_diff;
else
wanted_diff = videorate->average_period * 10;
videorate->average =
gst_util_uint64_scale_round (videorate->average,
videorate->average_period - wanted_diff,
videorate->average_period) +
gst_util_uint64_scale_round (diff, wanted_diff,
videorate->average_period);
} else {
videorate->average = diff;
}
}
videorate->last_ts = ts;
push:
videorate->out++;
return GST_FLOW_OK;
drop:
if (!videorate->silent)
gst_video_rate_notify_drop (videorate);
return GST_BASE_TRANSFORM_FLOW_DROPPED;
}
/* Check if downstream forces variable framerate (0/1) and if
* it is the case, use variable framerate ourself
* Otherwise compute the framerate from the 2 buffers that we
* have already received and make use of it as wanted framerate
*/
static void
gst_video_rate_check_variable_rate (GstVideoRate * videorate,
GstBuffer * buffer)
{
GstStructure *st;
gint fps_d, fps_n;
GstCaps *srcpadcaps, *tmpcaps;
GstPad *pad = NULL;
srcpadcaps =
gst_pad_get_current_caps (GST_BASE_TRANSFORM_SRC_PAD (videorate));
gst_video_guess_framerate (GST_BUFFER_PTS (buffer) -
GST_BUFFER_PTS (videorate->prevbuf), &fps_n, &fps_d);
tmpcaps = gst_caps_copy (srcpadcaps);
st = gst_caps_get_structure (tmpcaps, 0);
gst_structure_set (st, "framerate", GST_TYPE_FRACTION, fps_n, fps_d, NULL);
gst_caps_unref (srcpadcaps);
pad = gst_pad_get_peer (GST_BASE_TRANSFORM_SRC_PAD (videorate));
if (pad && !gst_pad_query_accept_caps (pad, tmpcaps)) {
videorate->force_variable_rate = TRUE;
GST_DEBUG_OBJECT (videorate, "Downstream forces variable framerate"
" respecting it");
goto done;
}
videorate->to_rate_numerator = fps_n;
videorate->to_rate_denominator = fps_d;
GST_INFO_OBJECT (videorate, "Computed framerate to %d/%d",
videorate->to_rate_numerator, videorate->to_rate_denominator);
videorate->updating_caps = TRUE;
gst_base_transform_update_src_caps (GST_BASE_TRANSFORM (videorate), tmpcaps);
done:
gst_caps_unref (tmpcaps);
if (pad)
gst_object_unref (pad);
}
static GstFlowReturn
gst_video_rate_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
{
GstVideoRate *videorate;
GstFlowReturn res = GST_BASE_TRANSFORM_FLOW_DROPPED;
GstClockTime intime, in_ts, in_dur;
GstClockTime avg_period;
gboolean skip = FALSE;
videorate = GST_VIDEO_RATE (trans);
/* make sure the denominators are not 0 */
if (videorate->from_rate_denominator == 0 ||
videorate->to_rate_denominator == 0)
goto not_negotiated;
if (videorate->to_rate_numerator == 0 && videorate->prevbuf &&
!videorate->force_variable_rate) {
gst_video_rate_check_variable_rate (videorate, buffer);
}
GST_OBJECT_LOCK (videorate);
avg_period = videorate->average_period_set;
GST_OBJECT_UNLOCK (videorate);
/* MT-safe switching between modes */
if (G_UNLIKELY (avg_period != videorate->average_period)) {
gboolean switch_mode = (avg_period == 0 || videorate->average_period == 0);
videorate->average_period = avg_period;
videorate->last_ts = GST_CLOCK_TIME_NONE;
if (switch_mode) {
if (avg_period) {
/* enabling average mode */
videorate->average = 0;
/* make sure no cached buffers from regular mode are left */
gst_video_rate_swap_prev (videorate, NULL, 0);
} else {
/* enable regular mode */
videorate->next_ts = GST_CLOCK_TIME_NONE;
skip = TRUE;
}
/* max averaging mode has a no latency, normal mode does */
gst_element_post_message (GST_ELEMENT (videorate),
gst_message_new_latency (GST_OBJECT (videorate)));
}
}
if (videorate->average_period > 0)
return gst_video_rate_trans_ip_max_avg (videorate, buffer);
in_ts = GST_BUFFER_TIMESTAMP (buffer);
in_dur = GST_BUFFER_DURATION (buffer);
if (G_UNLIKELY (in_ts == GST_CLOCK_TIME_NONE)) {
in_ts = videorate->last_ts;
if (G_UNLIKELY (in_ts == GST_CLOCK_TIME_NONE))
goto invalid_buffer;
}
/* get the time of the next expected buffer timestamp, we use this when the
* next buffer has -1 as a timestamp */
videorate->last_ts = in_ts;
if (in_dur != GST_CLOCK_TIME_NONE)
videorate->last_ts += in_dur;
GST_DEBUG_OBJECT (videorate, "got buffer with timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (in_ts));
/* the input time is the time in the segment + all previously accumulated
* segments */
intime = in_ts + videorate->segment.base;
/* we need to have two buffers to compare */
if (videorate->prevbuf == NULL || videorate->drop_only) {
gst_video_rate_swap_prev (videorate, buffer, intime);
videorate->in++;
if (!GST_CLOCK_TIME_IS_VALID (videorate->next_ts)) {
/* new buffer, we expect to output a buffer that matches the first
* timestamp in the segment */
if (videorate->skip_to_first || skip) {
videorate->next_ts = intime;
videorate->base_ts = in_ts - videorate->segment.start;
videorate->out_frame_count = 0;
} else {
videorate->next_ts = videorate->segment.start + videorate->segment.base;
}
}
/* In drop-only mode we can already decide here if we should output the
* current frame or drop it because it's coming earlier than our minimum
* allowed frame period. This also keeps latency down to 0 frames
*/
if (videorate->drop_only) {
if (intime >= videorate->next_ts) {
GstFlowReturn r;
/* on error the _flush function posted a warning already */
if ((r = gst_video_rate_flush_prev (videorate, FALSE)) != GST_FLOW_OK) {
res = r;
goto done;
}
}
/* No need to keep the buffer around for longer */
gst_buffer_replace (&videorate->prevbuf, NULL);
}
} else {
GstClockTime prevtime;
gint count = 0;
gint64 diff1, diff2;
prevtime = videorate->prev_ts;
GST_LOG_OBJECT (videorate,
"BEGINNING prev buf %" GST_TIME_FORMAT " new buf %" GST_TIME_FORMAT
" outgoing ts %" GST_TIME_FORMAT, GST_TIME_ARGS (prevtime),
GST_TIME_ARGS (intime), GST_TIME_ARGS (videorate->next_ts));
videorate->in++;
/* drop new buffer if it's before previous one */
if (intime < prevtime) {
GST_DEBUG_OBJECT (videorate,
"The new buffer (%" GST_TIME_FORMAT
") is before the previous buffer (%"
GST_TIME_FORMAT "). Dropping new buffer.",
GST_TIME_ARGS (intime), GST_TIME_ARGS (prevtime));
videorate->drop++;
if (!videorate->silent)
gst_video_rate_notify_drop (videorate);
goto done;
}
/* got 2 buffers, see which one is the best */
do {
diff1 = prevtime - videorate->next_ts;
diff2 = intime - videorate->next_ts;
/* take absolute values, beware: abs and ABS don't work for gint64 */
if (diff1 < 0)
diff1 = -diff1;
if (diff2 < 0)
diff2 = -diff2;
GST_LOG_OBJECT (videorate,
"diff with prev %" GST_TIME_FORMAT " diff with new %"
GST_TIME_FORMAT " outgoing ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (diff1), GST_TIME_ARGS (diff2),
GST_TIME_ARGS (videorate->next_ts));
if (!GST_BUFFER_DURATION_IS_VALID (videorate->prevbuf) &&
intime > prevtime) {
/* Make sure that we have a duration for previous buffer */
GST_BUFFER_DURATION (videorate->prevbuf) = intime - prevtime;
}
/* output first one when its the best */
if (diff1 <= diff2) {
GstFlowReturn r;
count++;
/* on error the _flush function posted a warning already */
if ((r = gst_video_rate_flush_prev (videorate,
count > 1)) != GST_FLOW_OK) {
res = r;
goto done;
}
}
/* Do not produce any dups. We can exit loop now */
if (videorate->drop_only)
break;
/* continue while the first one was the best, if they were equal avoid
* going into an infinite loop */
}
while (diff1 < diff2);
/* if we outputed the first buffer more then once, we have dups */
if (count > 1) {
videorate->dup += count - 1;
if (!videorate->silent)
gst_video_rate_notify_duplicate (videorate);
}
/* if we didn't output the first buffer, we have a drop */
else if (count == 0) {
videorate->drop++;
if (!videorate->silent)
gst_video_rate_notify_drop (videorate);
GST_LOG_OBJECT (videorate,
"new is best, old never used, drop, outgoing ts %"
GST_TIME_FORMAT, GST_TIME_ARGS (videorate->next_ts));
}
GST_LOG_OBJECT (videorate,
"END, putting new in old, diff1 %" GST_TIME_FORMAT
", diff2 %" GST_TIME_FORMAT ", next_ts %" GST_TIME_FORMAT
", in %" G_GUINT64_FORMAT ", out %" G_GUINT64_FORMAT ", drop %"
G_GUINT64_FORMAT ", dup %" G_GUINT64_FORMAT, GST_TIME_ARGS (diff1),
GST_TIME_ARGS (diff2), GST_TIME_ARGS (videorate->next_ts),
videorate->in, videorate->out, videorate->drop, videorate->dup);
/* swap in new one when it's the best */
gst_video_rate_swap_prev (videorate, buffer, intime);
}
done:
return res;
/* ERRORS */
not_negotiated:
{
GST_WARNING_OBJECT (videorate, "no framerate negotiated");
res = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
invalid_buffer:
{
GST_WARNING_OBJECT (videorate,
"Got buffer with GST_CLOCK_TIME_NONE timestamp, discarding it");
res = GST_BASE_TRANSFORM_FLOW_DROPPED;
goto done;
}
}
static gboolean
gst_video_rate_start (GstBaseTransform * trans)
{
gst_video_rate_reset (GST_VIDEO_RATE (trans));
return TRUE;
}
static gboolean
gst_video_rate_stop (GstBaseTransform * trans)
{
gst_video_rate_reset (GST_VIDEO_RATE (trans));
return TRUE;
}
static void
gst_video_rate_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVideoRate *videorate = GST_VIDEO_RATE (object);
gboolean latency_changed = FALSE;
GST_OBJECT_LOCK (videorate);
switch (prop_id) {
case PROP_SILENT:
videorate->silent = g_value_get_boolean (value);
break;
case PROP_NEW_PREF:
videorate->new_pref = g_value_get_double (value);
break;
case PROP_SKIP_TO_FIRST:
videorate->skip_to_first = g_value_get_boolean (value);
break;
case PROP_DROP_ONLY:{
gboolean new_value = g_value_get_boolean (value);
/* Latency changes if we switch drop-only mode */
latency_changed = new_value != videorate->drop_only;
videorate->drop_only = g_value_get_boolean (value);
goto reconfigure;
break;
}
case PROP_AVERAGE_PERIOD:
videorate->average_period_set = g_value_get_uint64 (value);
break;
case PROP_MAX_RATE:
g_atomic_int_set (&videorate->max_rate, g_value_get_int (value));
goto reconfigure;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (videorate);
return;
reconfigure:
GST_OBJECT_UNLOCK (videorate);
gst_base_transform_reconfigure_src (GST_BASE_TRANSFORM (videorate));
if (latency_changed) {
gst_element_post_message (GST_ELEMENT (videorate),
gst_message_new_latency (GST_OBJECT (videorate)));
}
}
static void
gst_video_rate_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstVideoRate *videorate = GST_VIDEO_RATE (object);
GST_OBJECT_LOCK (videorate);
switch (prop_id) {
case PROP_IN:
g_value_set_uint64 (value, videorate->in);
break;
case PROP_OUT:
g_value_set_uint64 (value, videorate->out);
break;
case PROP_DUP:
g_value_set_uint64 (value, videorate->dup);
break;
case PROP_DROP:
g_value_set_uint64 (value, videorate->drop);
break;
case PROP_SILENT:
g_value_set_boolean (value, videorate->silent);
break;
case PROP_NEW_PREF:
g_value_set_double (value, videorate->new_pref);
break;
case PROP_SKIP_TO_FIRST:
g_value_set_boolean (value, videorate->skip_to_first);
break;
case PROP_DROP_ONLY:
g_value_set_boolean (value, videorate->drop_only);
break;
case PROP_AVERAGE_PERIOD:
g_value_set_uint64 (value, videorate->average_period_set);
break;
case PROP_MAX_RATE:
g_value_set_int (value, g_atomic_int_get (&videorate->max_rate));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (videorate);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (video_rate_debug, "videorate", 0,
"VideoRate stream fixer");
return gst_element_register (plugin, "videorate", GST_RANK_NONE,
GST_TYPE_VIDEO_RATE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
videorate,
"Adjusts video frames",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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