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gstreamer/subprojects/gst-plugins-base/gst/videorate/gstvideorate.c

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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
* @title: 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.
*
* The property #GstVideoRate:rate allows the modification of video speed by a
* certain factor. It must not be confused with framerate. Think of rate as
* speed and framerate as flow.
*
* ## Example pipelines
* |[
* 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.
*
*/
#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
#define DEFAULT_RATE 1.0
#define DEFAULT_MAX_DUPLICATION_TIME 0
#define DEFAULT_MAX_CLOSING_SEGMENT_DUPLICATION_DURATION GST_SECOND
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,
PROP_RATE,
PROP_MAX_DUPLICATION_TIME,
PROP_MAX_CLOSING_SEGMENT_DUPLICATION_DURATION
};
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);" "video/x-bayer(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);" "video/x-bayer(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_src_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);
GST_ELEMENT_REGISTER_DEFINE (videorate, "videorate",
GST_RANK_NONE, GST_TYPE_VIDEO_RATE);
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->src_event = GST_DEBUG_FUNCPTR (gst_video_rate_src_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));
/**
* GstVideoRate:rate:
*
* Factor of speed for frame displaying
*
* Since: 1.12
*/
g_object_class_install_property (object_class, PROP_RATE,
g_param_spec_double ("rate", "Rate",
"Factor of speed for frame displaying", 0.0, G_MAXDOUBLE,
DEFAULT_RATE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
/**
* GstVideoRate:max-duplication-time:
*
* Duplicate frames only if the gap between two consecutive frames does not
* exceed this duration.
*
* Since: 1.16
*/
g_object_class_install_property (object_class, PROP_MAX_DUPLICATION_TIME,
g_param_spec_uint64 ("max-duplication-time",
"Maximum time to duplicate a frame",
"Do not duplicate frames if the gap exceeds this period "
"(in ns) (0 = disabled)",
0, G_MAXUINT64, DEFAULT_MAX_DUPLICATION_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstVideoRate:max-closing-segment-duplication-duration:
*
* Limits the maximum duration for which the last buffer is duplicated when
* finalizing a segment or on EOS. When receiving an EOS event or a new
* segment, videorate duplicates the last frame to close the configured
* segment (copying the last buffer until its #GstSegment.stop time (or
* #GstSegment.start time for reverse playback) is reached), this property
* ensures that it won't push buffers covering a duration longer than
* specified.
*
* Since: 1.22
*/
g_object_class_install_property (object_class,
PROP_MAX_CLOSING_SEGMENT_DUPLICATION_DURATION,
g_param_spec_uint64 ("max-closing-segment-duplication-duration",
"Maximum closing segment duplication duration",
"Maximum duration of duplicated buffers to close current segment", 0,
G_MAXUINT64, DEFAULT_MAX_CLOSING_SEGMENT_DUPLICATION_DURATION,
G_PARAM_READWRITE | 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_static_pad_template (element_class,
&gst_video_rate_sink_template);
gst_element_class_add_static_pad_template (element_class,
&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 up to the maximum framerate at the src */
gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE,
0, 1, max_num, max_denom, NULL);
} else if (min_num == 0) {
/* if provided with variable framerate input, then we don't have a
* restriction on the output framerate currently */
gst_structure_set (s2, "framerate", GST_TYPE_FRACTION_RANGE,
min_num, 1, maxrate, 1, 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;
const GValue *par;
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);
if ((par = gst_structure_get_value (s, "pixel-aspect-ratio")))
gst_structure_fixate_field_nearest_fraction (s, "pixel-aspect-ratio", 1, 1);
return gst_caps_fixate (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->segment.rate < 0.0 ? 1 : 0),
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:
if (ret) {
gst_caps_replace (&videorate->in_caps, in_caps);
}
return ret;
no_framerate:
{
GST_DEBUG_OBJECT (videorate, "no framerate specified");
ret = FALSE;
goto done;
}
}
static void
gst_video_rate_reset (GstVideoRate * videorate, gboolean on_flush)
{
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;
if (!on_flush) {
/* Do not clear caps on flush events as those are still valid */
gst_clear_caps (&videorate->in_caps);
}
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, FALSE);
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->rate = DEFAULT_RATE;
videorate->pending_rate = DEFAULT_RATE;
videorate->max_duplication_time = DEFAULT_MAX_DUPLICATION_TIME;
videorate->max_closing_segment_duplication_duration =
DEFAULT_MAX_CLOSING_SEGMENT_DUPLICATION_DURATION;
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);
}
/* @outbuf: (transfer full) needs to be writable */
static GstFlowReturn
gst_video_rate_push_buffer (GstVideoRate * videorate, GstBuffer * outbuf,
gboolean duplicate, GstClockTime next_intime, gboolean invalid_duration)
{
GstFlowReturn res;
GstClockTime push_ts;
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->segment.rate < 0.0) {
if (videorate->to_rate_numerator) {
/* interpolate next expected timestamp in the segment */
GstClockTimeDiff next_ts =
videorate->segment.base + videorate->segment.stop -
videorate->base_ts -
gst_util_uint64_scale (videorate->out_frame_count + 1,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
videorate->next_ts = next_ts < 0 ? GST_CLOCK_TIME_NONE : next_ts;
GST_BUFFER_DURATION (outbuf) =
gst_util_uint64_scale (videorate->out_frame_count,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator) -
gst_util_uint64_scale (videorate->out_frame_count - 1,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
} else if (next_intime != GST_CLOCK_TIME_NONE) {
videorate->next_ts = next_intime;
} else {
GST_FIXME_OBJECT (videorate, "No next intime for reverse playback");
}
} else {
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 (!invalid_duration) {
/* There must always be a valid duration on prevbuf if rate > 0,
* it is ensured in the transform_ip function */
g_assert (GST_BUFFER_PTS_IS_VALID (outbuf));
g_assert (GST_BUFFER_DURATION_IS_VALID (outbuf));
g_assert (GST_BUFFER_DURATION (outbuf) != 0);
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;
}
/* flush the oldest buffer */
static GstFlowReturn
gst_video_rate_flush_prev (GstVideoRate * videorate, gboolean duplicate,
GstClockTime next_intime, gboolean invalid_duration)
{
GstBuffer *outbuf;
if (!videorate->prevbuf)
goto eos_before_buffers;
outbuf = gst_buffer_ref (videorate->prevbuf);
/* make sure we can write to the metadata */
outbuf = gst_buffer_make_writable (outbuf);
return gst_video_rate_push_buffer (videorate, outbuf, duplicate, next_intime,
invalid_duration);
/* 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);
gst_buffer_replace (&videorate->prevbuf, buffer);
/* Ensure that ->prev_caps always match ->prevbuf */
if (!buffer)
gst_caps_replace (&videorate->prev_caps, NULL);
else if (videorate->prev_caps != videorate->in_caps)
gst_caps_replace (&videorate->prev_caps, videorate->in_caps);
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);
}
static gboolean
gst_video_rate_check_duplicate_to_close_segment (GstVideoRate * videorate,
GstClockTime last_input_ts, gboolean is_first)
{
GstClockTime next_stream_time = videorate->next_ts - videorate->segment.base;
GstClockTime max_closing_segment_duplication_duration =
videorate->max_closing_segment_duplication_duration;
if (!GST_CLOCK_TIME_IS_VALID (videorate->next_ts))
return FALSE;
if (videorate->segment.rate > 0.0) {
if (!GST_CLOCK_TIME_IS_VALID (videorate->segment.stop)) {
/* Ensure that if no 'stop' is set, we push the last frame anyway */
return is_first;
}
if (next_stream_time >= videorate->segment.stop)
return FALSE;
if (GST_CLOCK_TIME_IS_VALID (max_closing_segment_duplication_duration)) {
if (last_input_ts > videorate->next_ts)
return TRUE;
return (videorate->next_ts - last_input_ts <
max_closing_segment_duplication_duration);
}
return TRUE;
}
/* Reverse playback */
if (!GST_CLOCK_TIME_IS_VALID (videorate->segment.start)) {
/* Ensure that if no 'start' is set, we push the last frame anyway */
return is_first;
}
if (next_stream_time < videorate->segment.start)
return FALSE;
if (GST_CLOCK_TIME_IS_VALID (max_closing_segment_duplication_duration)) {
if (last_input_ts < videorate->next_ts)
return TRUE;
return (last_input_ts - videorate->next_ts <
max_closing_segment_duplication_duration);
}
return TRUE;
}
static gint
gst_video_rate_duplicate_to_close_segment (GstVideoRate * videorate)
{
gint count = 0;
GstFlowReturn res;
GstClockTime last_input_ts = videorate->prev_ts;
if (videorate->drop_only)
return count;
if (!videorate->prevbuf) {
GST_INFO_OBJECT (videorate, "got EOS before any buffer was received");
return count;
}
GST_DEBUG_OBJECT (videorate, "Pushing buffers to close segment");
res = GST_FLOW_OK;
/* fill up to the end of current segment */
while (res == GST_FLOW_OK
&& gst_video_rate_check_duplicate_to_close_segment (videorate,
last_input_ts, count < 1)) {
res =
gst_video_rate_flush_prev (videorate, count > 0, GST_CLOCK_TIME_NONE,
FALSE);
count++;
}
GST_DEBUG_OBJECT (videorate, "----> Pushed %d buffers to close segment",
count);
return count;
}
/* WORKAROUND: This works around BaseTransform limitation as instead of rolling
* back caps, we should be able to push caps only when we are sure we are ready
* to do so. Right now, BaseTransform doesn't let us do anything like that
* so we rollback to previous caps when strictly required (though we now it
* might not be so safe).
*
* To be used only when wanting to 'close' a segment, this function will reset
* caps to previous caps, which will match the content of `prevbuf` in that case
*
* Returns: The previous GstCaps if we rolled back to previous buffers, NULL
* otherwise.
*
* NOTE: When some caps are returned, we should reset them back after
* closing the segment is done.
*/
static GstCaps *
gst_video_rate_rollback_to_prev_caps_if_needed (GstVideoRate * videorate)
{
GstCaps *prev_caps = NULL;
if (videorate->prev_caps && videorate->prev_caps != videorate->in_caps) {
if (videorate->in_caps)
prev_caps = gst_caps_ref (videorate->in_caps);
if (!gst_pad_send_event (GST_BASE_TRANSFORM_SINK_PAD (videorate),
gst_event_new_caps (videorate->prev_caps)
)) {
GST_WARNING_OBJECT (videorate, "Could not send previous caps to close "
" segment, not closing it");
gst_video_rate_swap_prev (videorate, NULL, GST_CLOCK_TIME_NONE);
videorate->last_ts = GST_CLOCK_TIME_NONE;
videorate->average = 0;
}
gst_clear_caps (&videorate->prev_caps);
}
return prev_caps;
}
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:
{
GstSegment segment;
gint seqnum;
GstCaps *rolled_back_caps;
gst_event_copy_segment (event, &segment);
if (segment.format != GST_FORMAT_TIME)
goto format_error;
segment.start = (gint64) (segment.start / videorate->rate);
segment.position = (gint64) (segment.position / videorate->rate);
if (GST_CLOCK_TIME_IS_VALID (segment.stop))
segment.stop = (gint64) (segment.stop / videorate->rate);
segment.time = (gint64) (segment.time / videorate->rate);
if (!gst_segment_is_equal (&segment, &videorate->segment)) {
rolled_back_caps =
gst_video_rate_rollback_to_prev_caps_if_needed (videorate);
/* close up the previous segment, if appropriate */
if (videorate->prevbuf) {
/* fill up to the end of current segment */
gint count = gst_video_rate_duplicate_to_close_segment (videorate);
if (count > 1) {
videorate->dup += count - 1;
if (!videorate->silent)
gst_video_rate_notify_duplicate (videorate);
}
/* clean up for the new one; _chain will resume from the new start */
gst_video_rate_swap_prev (videorate, NULL, 0);
}
if (rolled_back_caps) {
GST_DEBUG_OBJECT (videorate,
"Resetting rolled back caps %" GST_PTR_FORMAT, rolled_back_caps);
if (!gst_pad_send_event (GST_BASE_TRANSFORM_SINK_PAD (videorate),
gst_event_new_caps (rolled_back_caps)
)) {
GST_WARNING_OBJECT (videorate,
"Could not resend caps after closing " " segment");
GST_ELEMENT_ERROR (videorate, CORE, NEGOTIATION,
("Could not resend caps after closing segment"), (NULL));
gst_caps_unref (rolled_back_caps);
return FALSE;
}
gst_caps_unref (rolled_back_caps);
}
}
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);
seqnum = gst_event_get_seqnum (event);
gst_event_unref (event);
event = gst_event_new_segment (&segment);
gst_event_set_seqnum (event, seqnum);
break;
}
case GST_EVENT_SEGMENT_DONE:
case GST_EVENT_EOS:{
gint count = 0;
GstFlowReturn res = GST_FLOW_OK;
GstCaps *rolled_back_caps;
GST_DEBUG_OBJECT (videorate, "Got %s",
gst_event_type_get_name (GST_EVENT_TYPE (event)));
rolled_back_caps =
gst_video_rate_rollback_to_prev_caps_if_needed (videorate);
/* 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 */
count = gst_video_rate_duplicate_to_close_segment (videorate);
} else if (!videorate->drop_only && 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, duration =
GST_BUFFER_DURATION (videorate->prevbuf);
if (GST_CLOCK_TIME_IS_VALID
(videorate->max_closing_segment_duplication_duration))
duration =
MIN (videorate->max_closing_segment_duplication_duration,
duration);
end_ts = videorate->next_ts + duration;
while (res == GST_FLOW_OK && ((videorate->segment.rate > 0.0
&& GST_CLOCK_TIME_IS_VALID (videorate->segment.stop)
&& GST_CLOCK_TIME_IS_VALID (videorate->next_ts)
&& videorate->next_ts - videorate->segment.base < end_ts)
|| count < 1)) {
res =
gst_video_rate_flush_prev (videorate, count > 0,
GST_CLOCK_TIME_NONE, FALSE);
count++;
}
} else {
/* allow the duration to be invalid as there is no way to infer it if we
* received a single buffer and not output framerate was set. */
res =
gst_video_rate_flush_prev (videorate, FALSE, GST_CLOCK_TIME_NONE,
TRUE);
count = 1;
}
}
if (rolled_back_caps) {
GST_DEBUG_OBJECT (videorate,
"Resetting rolled back caps %" GST_PTR_FORMAT, rolled_back_caps);
if (!gst_pad_send_event (GST_BASE_TRANSFORM_SINK_PAD (videorate),
gst_event_new_caps (rolled_back_caps)
)) {
/* Not erroring out on EOS as it won't be too bad in any case */
GST_WARNING_OBJECT (videorate, "Could not resend caps after closing "
" segment on EOS (ignoring the error)");
}
gst_caps_unref (rolled_back_caps);
}
if (count > 1) {
videorate->dup += count - 1;
if (!videorate->silent)
gst_video_rate_notify_duplicate (videorate);
} else if (count == 0
&& !GST_CLOCK_TIME_IS_VALID (videorate->segment.stop)) {
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, TRUE);
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_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstVideoRate *videorate;
GstPad *sinkpad;
gboolean res = FALSE;
videorate = GST_VIDEO_RATE (trans);
sinkpad = GST_BASE_TRANSFORM_SINK_PAD (trans);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
gdouble srate;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gint seqnum = gst_event_get_seqnum (event);
gst_event_parse_seek (event, &srate, NULL, &flags, &start_type, &start,
&stop_type, &stop);
start = (gint64) (start * videorate->rate);
if (GST_CLOCK_TIME_IS_VALID (stop)) {
stop = (gint64) (stop * videorate->rate);
}
gst_event_unref (event);
event = gst_event_new_seek (srate, GST_FORMAT_TIME,
flags, start_type, start, stop_type, stop);
gst_event_set_seqnum (event, seqnum);
res = gst_pad_push_event (sinkpad, event);
break;
}
case GST_EVENT_QOS:
{
GstQOSType type;
gdouble proportion;
GstClockTimeDiff diff;
GstClockTime timestamp;
gst_event_parse_qos (event, &type, &proportion, &diff, &timestamp);
if (GST_CLOCK_TIME_IS_VALID (timestamp) && videorate->rate != 1.0) {
GST_OBJECT_LOCK (trans);
GST_DEBUG_OBJECT (trans, "Rescaling QoS event taking our rate into"
"account. Timestamp: %" GST_TIME_FORMAT " -> %" GST_TIME_FORMAT
" - diff %" G_GINT64_FORMAT "-> %" G_GINT64_FORMAT,
GST_TIME_ARGS (timestamp),
GST_TIME_ARGS (videorate->base_ts + ((timestamp -
videorate->base_ts) * videorate->rate)), diff,
(GstClockTimeDiff) (diff * videorate->rate));
if (videorate->segment.rate < 0.0)
timestamp =
(videorate->segment.stop - videorate->base_ts) -
((videorate->segment.stop - videorate->base_ts -
timestamp) * videorate->rate);
else
timestamp =
videorate->base_ts + ((timestamp -
videorate->base_ts) * videorate->rate);
diff *= videorate->rate;
GST_OBJECT_UNLOCK (trans);
gst_event_unref (event);
event = gst_event_new_qos (type, proportion, diff, timestamp);
}
/* Fallthrough */
}
default:
res = gst_pad_push_event (sinkpad, event);
break;
}
return res;
}
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 fall back if we don't have a latency or a peer that we
* can ask about its latency yet.. */
res =
GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction,
query);
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
gint64 duration;
gdouble rate;
res =
GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction,
query);
if (!res)
break;
GST_OBJECT_LOCK (videorate);
rate = videorate->pending_rate;
GST_OBJECT_UNLOCK (videorate);
if (rate == 1.0)
break;
gst_query_parse_duration (query, &format, &duration);
if (format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (videorate, "not TIME format");
break;
}
GST_LOG_OBJECT (videorate, "upstream duration: %" G_GINT64_FORMAT,
duration);
/* Shouldn't this be a multiplication if the direction is downstream? */
if (GST_CLOCK_TIME_IS_VALID (duration)) {
duration = (gint64) (duration / rate);
}
GST_LOG_OBJECT (videorate, "our duration: %" G_GINT64_FORMAT, duration);
gst_query_set_duration (query, format, duration);
break;
}
case GST_QUERY_POSITION:
{
GstFormat dst_format;
gint64 dst_value;
gdouble rate;
GST_OBJECT_LOCK (videorate);
rate = videorate->rate;
GST_OBJECT_UNLOCK (videorate);
gst_query_parse_position (query, &dst_format, NULL);
if (dst_format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (videorate, "not TIME format");
break;
}
/* Shouldn't this be a multiplication if the direction is downstream? */
dst_value =
(gint64) (gst_segment_to_stream_time (&videorate->segment,
GST_FORMAT_TIME, videorate->last_ts / rate));
GST_LOG_OBJECT (videorate, "our position: %" GST_TIME_FORMAT,
GST_TIME_ARGS (dst_value));
gst_query_set_position (query, dst_format, dst_value);
res = TRUE;
break;
}
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 =
videorate->segment.rate <
0 ? videorate->last_ts - ts : 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, *downstream_caps;
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));
downstream_caps = gst_pad_query_caps (pad, NULL);
if (pad && !gst_caps_can_intersect (tmpcaps, downstream_caps)) {
videorate->force_variable_rate = TRUE;
gst_caps_unref (downstream_caps);
GST_DEBUG_OBJECT (videorate, "Downstream forces variable framerate"
" respecting it");
goto done;
}
gst_caps_unref (downstream_caps);
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);
/* also reconfigure sink so that buffer pool can be updated again */
gst_base_transform_reconfigure_sink (GST_BASE_TRANSFORM (videorate));
done:
gst_caps_unref (tmpcaps);
if (pad)
gst_object_unref (pad);
}
static gboolean
gst_video_rate_switch_mode_if_needed (GstVideoRate * videorate)
{
gboolean switch_mode;
GstClockTime avg_period;
gboolean skip = FALSE;
GST_OBJECT_LOCK (videorate);
avg_period = videorate->average_period_set;
GST_OBJECT_UNLOCK (videorate);
/* MT-safe switching between modes */
if (G_LIKELY (avg_period == videorate->average_period))
return skip;
switch_mode = (avg_period == 0 || videorate->average_period == 0);
if (!switch_mode)
return skip;
videorate->average_period = avg_period;
videorate->last_ts = GST_CLOCK_TIME_NONE;
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 no latency, normal mode does */
gst_element_post_message (GST_ELEMENT (videorate),
gst_message_new_latency (GST_OBJECT (videorate)));
return skip;
}
static gboolean
gst_video_rate_do_max_duplicate (GstVideoRate * videorate, GstBuffer * buffer,
GstClockTime intime, GstClockTime prevtime, gint * count)
{
if (videorate->max_duplication_time <= 0)
return TRUE;
/* We already know that intime and prevtime are not out of order, based
* on the previous condition. Using ABS in case rate < 0, in which case
* the order is reversed. */
if (ABS (GST_CLOCK_DIFF (intime, prevtime)) > videorate->max_duplication_time) {
GST_DEBUG_OBJECT (videorate,
"The new buffer (%" GST_TIME_FORMAT
") is further away from previous buffer (%" GST_TIME_FORMAT
") than max-duplication-time (%" GST_TIME_FORMAT ")",
GST_TIME_ARGS (intime), GST_TIME_ARGS (prevtime),
GST_TIME_ARGS (videorate->max_duplication_time));
/* First send out enough buffers to actually reach the time of the
* previous buffer */
if (videorate->segment.rate < 0.0) {
while (videorate->next_ts > prevtime) {
gst_video_rate_flush_prev (videorate, *count > 0, GST_CLOCK_TIME_NONE,
FALSE);
*count += 1;
}
} else {
while (videorate->next_ts <= prevtime) {
gst_video_rate_flush_prev (videorate, *count > 0, GST_CLOCK_TIME_NONE,
FALSE);
*count += 1;
}
}
if (*count > 1) {
videorate->dup += *count - 1;
if (!videorate->silent)
gst_video_rate_notify_duplicate (videorate);
}
/* The gap between the two buffers is too large. Don't fill it, just
* let a discont through */
videorate->discont = TRUE;
if (videorate->segment.rate < 0.0) {
videorate->base_ts -= prevtime - intime;
} else {
videorate->base_ts += intime - prevtime;
}
videorate->next_ts = intime;
/* Swap in new buffer and get rid of old buffer so that starting with
* the next input buffer we output from the new position */
gst_video_rate_swap_prev (videorate, buffer, intime);
return FALSE;
}
return TRUE;
}
static gboolean
gst_video_rate_apply_pending_rate (GstVideoRate * videorate)
{
gboolean ret = FALSE;
GST_OBJECT_LOCK (videorate);
if (videorate->pending_rate == videorate->rate)
goto done;
ret = TRUE;
videorate->base_ts += gst_util_uint64_scale (videorate->out_frame_count,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
videorate->rate = videorate->pending_rate;
videorate->out_frame_count = 0;
done:
GST_OBJECT_UNLOCK (videorate);
return ret;
}
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, last_ts;
gboolean skip;
videorate = GST_VIDEO_RATE (trans);
if (videorate->prev_caps != videorate->in_caps) {
/* After caps where set we didn't reset the state so we could close
* the segment from previous caps if necessary, we got a buffer after the
* new caps so we can reset now */
GST_DEBUG_OBJECT (videorate, "Clearing old buffers now that we had a buffer"
" after receiving caps");
gst_video_rate_swap_prev (videorate, NULL, GST_CLOCK_TIME_NONE);
gst_clear_caps (&videorate->prev_caps);
videorate->last_ts = GST_CLOCK_TIME_NONE;
videorate->average = 0;
}
/* 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) {
if (!GST_BUFFER_PTS_IS_VALID (buffer) ||
!GST_BUFFER_PTS_IS_VALID (videorate->prevbuf)) {
GST_ELEMENT_ERROR (videorate, STREAM, FAILED, (NULL),
("videorate requires a non-variable framerate on the output caps or the"
" two first consecutive buffers to have valid timestamps to guess the"
" framerate."));
return GST_FLOW_ERROR;
}
gst_video_rate_check_variable_rate (videorate, buffer);
}
skip = gst_video_rate_switch_mode_if_needed (videorate);
if (videorate->average_period > 0)
return gst_video_rate_trans_ip_max_avg (videorate, buffer);
gst_video_rate_apply_pending_rate (videorate);
in_ts = GST_BUFFER_TIMESTAMP (buffer);
in_dur = GST_BUFFER_DURATION (buffer);
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (in_ts))) {
/* For reverse playback, we need all input timestamps as we can't
* guess from the previous buffers timestamp and duration */
if (G_UNLIKELY (videorate->segment.rate < 0.0))
goto invalid_buffer;
in_ts = videorate->last_ts;
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (in_ts)))
goto invalid_buffer;
}
/* get the time of the next expected buffer timestamp, we use this when the
* next buffer has -1 as a timestamp */
last_ts = videorate->last_ts;
videorate->last_ts = in_ts;
if (GST_CLOCK_TIME_IS_VALID (in_dur) && videorate->segment.rate > 0.0)
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) {
/* We can calculate the duration of the buffer here if not given for
* reverse playback. We need this later */
if (videorate->segment.rate < 0.0 && !GST_BUFFER_DURATION_IS_VALID (buffer)) {
/* As we require valid timestamps all the time for reverse playback, we either
* have a valid last_ts or we're at the very first buffer. */
if (!GST_CLOCK_TIME_IS_VALID (last_ts))
GST_BUFFER_DURATION (buffer) = videorate->segment.stop - in_ts;
else
GST_BUFFER_DURATION (buffer) = last_ts - in_ts;
}
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;
if (videorate->segment.rate < 0.0) {
videorate->base_ts = videorate->segment.stop - in_ts;
} else {
videorate->base_ts = in_ts - videorate->segment.start;
}
videorate->out_frame_count = 0;
} else {
if (videorate->segment.rate < 0.0) {
if (videorate->to_rate_numerator) {
GstClockTime frame_duration = gst_util_uint64_scale (1,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
videorate->next_ts =
videorate->segment.stop + videorate->segment.base;
if (videorate->next_ts > frame_duration)
videorate->next_ts =
MAX (videorate->segment.start,
videorate->next_ts - frame_duration);
else
videorate->next_ts = videorate->segment.start;
} else {
/* What else can we do? */
videorate->next_ts = intime;
}
} 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 ((videorate->segment.rate > 0.0 && intime >= videorate->next_ts) ||
(videorate->segment.rate < 0.0 && intime <= videorate->next_ts)) {
GstFlowReturn r;
/* The buffer received from basetransform is guaranteed to be writable.
* It just needs to be reffed so the buffer won't be consumed once pushed and
* GstBaseTransform can get its reference back. */
if ((r = gst_video_rate_push_buffer (videorate,
gst_buffer_ref (buffer), FALSE,
GST_CLOCK_TIME_NONE, FALSE)) != GST_FLOW_OK) {
res = r;
goto done;
}
} else {
videorate->drop++;
}
/* No need to keep the buffer around for longer */
gst_buffer_replace (&videorate->prevbuf, NULL);
}
} else {
GstClockTime prevtime;
gint count = 0;
gint64 diff1 = 0, diff2 = 0;
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 ((videorate->segment.rate > 0.0 && intime < prevtime) ||
(videorate->segment.rate < 0.0 && 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;
}
if (!gst_video_rate_do_max_duplicate (videorate, buffer, intime, prevtime,
&count))
goto done;
/* got 2 buffers, see which one is the best */
do {
GstClockTime next_ts;
if (gst_video_rate_apply_pending_rate (videorate))
goto done;
if (videorate->segment.rate < 0.0) {
/* Make sure that we have a duration for this buffer. The previous
* buffer already has a duration given by either exactly this code,
* or the code above for the very first buffer */
g_assert (GST_BUFFER_DURATION_IS_VALID (videorate->prevbuf));
if (!GST_BUFFER_DURATION_IS_VALID (buffer))
GST_BUFFER_DURATION (buffer) =
prevtime > intime ? prevtime - intime : 0;
} else {
/* Make sure that we have a duration for previous buffer */
if (!GST_BUFFER_DURATION_IS_VALID (videorate->prevbuf))
GST_BUFFER_DURATION (videorate->prevbuf) =
intime > prevtime ? intime - prevtime : 0;
}
#ifndef ABSDIFF
#define ABSDIFF(a, b) (((a) > (b)) ? (a) - (b) : (b) - (a))
#endif
/* take absolute diffs */
if (videorate->segment.rate < 0.0) {
GstClockTime next_end_ts;
GstClockTime prev_endtime;
GstClockTime in_endtime, base_ts_in_segment;
next_ts = videorate->next_ts;
if (!GST_CLOCK_TIME_IS_VALID (next_ts)) {
GST_DEBUG_OBJECT (videorate, "Already reached segment start,"
"ignoring buffer");
break;
}
prev_endtime = prevtime + GST_BUFFER_DURATION (videorate->prevbuf);
in_endtime = intime + GST_BUFFER_DURATION (buffer);
if (videorate->to_rate_numerator) {
GstClockTime frame_duration = gst_util_uint64_scale (1,
videorate->to_rate_denominator * GST_SECOND,
videorate->to_rate_numerator);
next_end_ts = next_ts + frame_duration;
} else {
next_end_ts = next_ts + GST_BUFFER_DURATION (videorate->prevbuf);
}
base_ts_in_segment = videorate->segment.stop - videorate->base_ts;
next_ts = base_ts_in_segment - (
(base_ts_in_segment - next_ts) * videorate->rate);
next_end_ts = base_ts_in_segment - (MAX (0,
(base_ts_in_segment - next_end_ts)) * videorate->rate);
diff1 = ABSDIFF (prev_endtime, next_end_ts);
diff2 = ABSDIFF (in_endtime, next_end_ts);
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 (next_end_ts));
} else {
next_ts =
videorate->base_ts + ((videorate->next_ts -
videorate->base_ts) * videorate->rate);
diff1 = ABSDIFF (prevtime, next_ts);
diff2 = ABSDIFF (intime, next_ts);
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 (next_ts));
}
/* 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, intime, FALSE)) != GST_FLOW_OK) {
res = r;
goto done;
}
}
/* continue while the first one was the best, if they were equal avoid
* going into an infinite loop */
}
while (diff1 < diff2);
/* if we outputted 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), FALSE);
return TRUE;
}
static gboolean
gst_video_rate_stop (GstBaseTransform * trans)
{
gst_video_rate_reset (GST_VIDEO_RATE (trans), FALSE);
return TRUE;
}
static void
gst_videorate_update_duration (GstVideoRate * videorate)
{
GstMessage *m;
m = gst_message_new_duration_changed (GST_OBJECT (videorate));
gst_element_post_message (GST_ELEMENT (videorate), m);
}
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;
}
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;
case PROP_RATE:
videorate->pending_rate = g_value_get_double (value);
GST_OBJECT_UNLOCK (videorate);
gst_videorate_update_duration (videorate);
return;
case PROP_MAX_DUPLICATION_TIME:
videorate->max_duplication_time = g_value_get_uint64 (value);
break;
case PROP_MAX_CLOSING_SEGMENT_DUPLICATION_DURATION:
videorate->max_closing_segment_duplication_duration =
g_value_get_uint64 (value);
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;
case PROP_RATE:
g_value_set_double (value, videorate->pending_rate);
break;
case PROP_MAX_DUPLICATION_TIME:
g_value_set_uint64 (value, videorate->max_duplication_time);
break;
case PROP_MAX_CLOSING_SEGMENT_DUPLICATION_DURATION:
g_value_set_uint64 (value,
videorate->max_closing_segment_duplication_duration);
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 (videorate, plugin);
}
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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