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gstreamer/gst/videorate/gstvideorate.c
Sjoerd Simons 08ac05a06c videorate: fix dynamically changing average period 
The average_period_set variable can be accessed in different threads, so
always lock it when reading. Furthermore when switching to averaging
mode we should make sure we don't have cached buffers that aren't used
in that mode. And any modeswitch will cause the latency to change, so we
should post a NewLatency message
2011-08-31 14:13:56 +01:00

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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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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 -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videorate ! video/x-raw-yuv,framerate=15/1 ! xvimagesink
* ]| Decode an Ogg/Theora file and adjust the framerate to 15 fps before playing.
* To create the test Ogg/Theora file refer to the documentation of theoraenc.
* |[
* gst-launch -v v4lsrc ! videorate ! video/x-raw-yuv,framerate=25/2 ! theoraenc ! oggmux ! filesink location=v4l.ogg
* ]| Capture video from a V4L device, and adjust the stream to 12.5 fps before
* encoding to Ogg/Theora.
* </refsect2>
*
* Last reviewed on 2006-09-02 (0.10.11)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvideorate.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
enum
{
ARG_0,
ARG_IN,
ARG_OUT,
ARG_DUP,
ARG_DROP,
ARG_SILENT,
ARG_NEW_PREF,
ARG_SKIP_TO_FIRST,
ARG_DROP_ONLY,
ARG_AVERAGE_PERIOD
/* FILL ME */
};
static GstStaticPadTemplate gst_video_rate_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv;"
"video/x-raw-rgb;" "video/x-raw-gray;" "image/jpeg;" "image/png")
);
static GstStaticPadTemplate gst_video_rate_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv;"
"video/x-raw-rgb;" "video/x-raw-gray;" "image/jpeg;" "image/png")
);
static void gst_video_rate_swap_prev (GstVideoRate * videorate,
GstBuffer * buffer, gint64 time);
static gboolean gst_video_rate_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);
static void gst_video_rate_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstFlowReturn gst_video_rate_prepare_output_buffer (GstBaseTransform *
trans, GstBuffer * input, gint size, GstCaps * caps, GstBuffer ** buf);
static GstFlowReturn gst_video_rate_transform_ip (GstBaseTransform * trans,
GstBuffer * buf);
static gboolean gst_video_rate_start (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;
GST_BOILERPLATE (GstVideoRate, gst_video_rate,
GstBaseTransform, GST_TYPE_BASE_TRANSFORM);
static void
gst_video_rate_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (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_video_rate_class_init (GstVideoRateClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *base_class = GST_BASE_TRANSFORM_CLASS (klass);
parent_class = g_type_class_peek_parent (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->prepare_output_buffer =
GST_DEBUG_FUNCPTR (gst_video_rate_prepare_output_buffer);
base_class->event = GST_DEBUG_FUNCPTR (gst_video_rate_event);
base_class->start = GST_DEBUG_FUNCPTR (gst_video_rate_start);
base_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_video_rate_fixate_caps);
base_class->query = GST_DEBUG_FUNCPTR (gst_video_rate_query);
g_object_class_install_property (object_class, ARG_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, ARG_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, ARG_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, ARG_DROP, pspec_drop);
g_object_class_install_property (object_class, ARG_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, ARG_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.
*
* Since: 0.10.25
*/
g_object_class_install_property (object_class, ARG_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.
*
* Since: 0.10.36
*/
g_object_class_install_property (object_class, ARG_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.
*
* Since: 0.10.36
*/
g_object_class_install_property (object_class, ARG_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));
}
static GstCaps *
gst_video_rate_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps)
{
GstCaps *ret;
GstStructure *s;
/* Should always be called with simple caps */
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL);
ret = gst_caps_copy (caps);
s = gst_structure_copy (gst_caps_get_structure (caps, 0));
/* set the framerate as a range */
gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1,
G_MAXINT, 1, NULL);
gst_caps_append_structure (ret, s);
return ret;
}
static void
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;
s = gst_caps_get_structure (othercaps, 0);
gst_structure_fixate_field_nearest_fraction (s, "framerate", num, denom);
}
static gboolean
gst_video_rate_setcaps (GstBaseTransform * trans, GstCaps * in_caps,
GstCaps * out_caps)
{
GstVideoRate *videorate;
GstStructure *structure;
gboolean ret = TRUE;
gint rate_numerator, rate_denominator;
videorate = GST_VIDEO_RATE (trans);
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;
gst_video_rate_swap_prev (videorate, NULL, 0);
gst_segment_init (&videorate->segment, GST_FORMAT_TIME);
}
static void
gst_video_rate_init (GstVideoRate * videorate, GstVideoRateClass * klass)
{
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->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_metadata_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.accum + 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;
}
/* 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.accum;
}
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)
{
#if !GLIB_CHECK_VERSION(2,26,0)
g_object_notify ((GObject *) videorate, "drop");
#else
g_object_notify_by_pspec ((GObject *) videorate, pspec_drop);
#endif
}
static void
gst_video_rate_notify_duplicate (GstVideoRate * videorate)
{
#if !GLIB_CHECK_VERSION(2,26,0)
g_object_notify ((GObject *) videorate, "duplicate");
#else
g_object_notify_by_pspec ((GObject *) videorate, pspec_duplicate);
#endif
}
#define MAGIC_LIMIT 25
static gboolean
gst_video_rate_event (GstBaseTransform * trans, GstEvent * event)
{
GstVideoRate *videorate;
videorate = GST_VIDEO_RATE (trans);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
gint64 start, stop, time;
gdouble rate, arate;
gboolean update;
GstFormat format;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
if (format != GST_FORMAT_TIME)
goto format_error;
GST_DEBUG_OBJECT (videorate, "handle NEWSEGMENT");
/* close up the previous segment, if appropriate */
if (!update && 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.accum
< 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 */
videorate->base_ts = 0;
videorate->out_frame_count = 0;
gst_video_rate_swap_prev (videorate, NULL, 0);
videorate->next_ts = GST_CLOCK_TIME_NONE;
}
/* We just want to update the accumulated stream_time */
gst_segment_set_newsegment_full (&videorate->segment, update, rate, arate,
format, start, stop, time);
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.accum <
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.accum < 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;
default:
break;
}
return TRUE;
/* ERRORS */
format_error:
{
GST_WARNING_OBJECT (videorate,
"Got segment but doesn't have GST_FORMAT_TIME value");
gst_event_unref (event);
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;
GstPad *peer;
GST_OBJECT_LOCK (videorate);
avg_period = videorate->average_period_set;
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));
if (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 = parent_class->query (trans, direction, query);
break;
}
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;
}
static GstFlowReturn
gst_video_rate_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * input, gint size, GstCaps * caps, GstBuffer ** buf)
{
if (gst_buffer_is_metadata_writable (input)) {
gst_buffer_set_caps (input, caps);
*buf = gst_buffer_ref (input);
} else {
*buf = gst_buffer_create_sub (input, 0, GST_BUFFER_SIZE (input));
gst_buffer_set_caps (*buf, caps);
}
return GST_FLOW_OK;
}
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;
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.accum;
/* we need to have two buffers to compare */
if (videorate->prevbuf == NULL) {
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.accum;
}
}
} 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));
/* 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 void
gst_video_rate_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVideoRate *videorate = GST_VIDEO_RATE (object);
GST_OBJECT_LOCK (videorate);
switch (prop_id) {
case ARG_SILENT:
videorate->silent = g_value_get_boolean (value);
break;
case ARG_NEW_PREF:
videorate->new_pref = g_value_get_double (value);
break;
case ARG_SKIP_TO_FIRST:
videorate->skip_to_first = g_value_get_boolean (value);
break;
case ARG_DROP_ONLY:
videorate->drop_only = g_value_get_boolean (value);
break;
case ARG_AVERAGE_PERIOD:
GST_OBJECT_LOCK (videorate);
videorate->average_period_set = g_value_get_uint64 (value);
GST_OBJECT_UNLOCK (videorate);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (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 ARG_IN:
g_value_set_uint64 (value, videorate->in);
break;
case ARG_OUT:
g_value_set_uint64 (value, videorate->out);
break;
case ARG_DUP:
g_value_set_uint64 (value, videorate->dup);
break;
case ARG_DROP:
g_value_set_uint64 (value, videorate->drop);
break;
case ARG_SILENT:
g_value_set_boolean (value, videorate->silent);
break;
case ARG_NEW_PREF:
g_value_set_double (value, videorate->new_pref);
break;
case ARG_SKIP_TO_FIRST:
g_value_set_boolean (value, videorate->skip_to_first);
break;
case ARG_DROP_ONLY:
g_value_set_boolean (value, videorate->drop_only);
break;
case ARG_AVERAGE_PERIOD:
GST_OBJECT_LOCK (videorate);
g_value_set_uint64 (value, videorate->average_period_set);
GST_OBJECT_UNLOCK (videorate);
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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