gstreamer/subprojects/gst-plugins-bad/gst/debugutils/gstfakevideosink.c
2022-03-23 20:03:40 +00:00

308 lines
9.4 KiB
C

/*
* GStreamer
* Copyright (C) 2017 Collabora Inc.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* 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-fakevideosink
* @title: fakevideosink
*
* This element is the same as fakesink but will pretend to support various
* allocation meta API like GstVideoMeta in order to prevent memory copies.
* This is useful for throughput testing and testing zero-copy path while
* creating a new pipeline.
*
* ## Example launch lines
* |[
* gst-launch-1.0 videotestsrc ! fakevideosink
* gst-launch-1.0 videotestsrc ! fpsdisplaysink text-overlay=false video-sink=fakevideosink
* ]|
*
* Since 1.14
*/
#include "gstdebugutilsbadelements.h"
#include "gstfakevideosink.h"
#include "gstfakesinkutils.h"
#include <gst/video/video.h>
#define C_FLAGS(v) ((guint) v)
GType
gst_fake_video_sink_allocation_meta_flags_get_type (void)
{
static const GFlagsValue values[] = {
{C_FLAGS (GST_ALLOCATION_FLAG_CROP_META),
"Expose the crop meta as supported", "crop"},
{C_FLAGS (GST_ALLOCATION_FLAG_OVERLAY_COMPOSITION_META),
"Expose the overlay composition meta as supported",
"overlay-composition"},
{0, NULL, NULL}
};
static GType id = 0;
if (g_once_init_enter ((gsize *) & id)) {
GType _id;
_id =
g_flags_register_static ("GstFakeVideoSinkAllocationMetaFlags", values);
g_once_init_leave ((gsize *) & id, _id);
}
return id;
}
enum
{
PROP_0,
PROP_ALLOCATION_META_FLAGS,
PROP_LAST
};
enum
{
SIGNAL_HANDOFF,
SIGNAL_PREROLL_HANDOFF,
LAST_SIGNAL
};
static guint gst_fake_video_sink_signals[LAST_SIGNAL] = { 0 };
#define ALLOCATION_META_DEFAULT_FLAGS GST_ALLOCATION_FLAG_CROP_META | GST_ALLOCATION_FLAG_OVERLAY_COMPOSITION_META
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY",
GST_VIDEO_FORMATS_ALL)));
G_DEFINE_TYPE (GstFakeVideoSink, gst_fake_video_sink, GST_TYPE_BIN);
GST_ELEMENT_REGISTER_DEFINE (fakevideosink, "fakevideosink",
GST_RANK_NONE, gst_fake_video_sink_get_type ());
static gboolean
gst_fake_video_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstFakeVideoSink *self = GST_FAKE_VIDEO_SINK (parent);
GstCaps *caps;
GstVideoInfo info;
guint min_buffers = 1;
if (GST_QUERY_TYPE (query) != GST_QUERY_ALLOCATION)
return gst_pad_query_default (pad, parent, query);
gst_query_parse_allocation (query, &caps, NULL);
if (!gst_video_info_from_caps (&info, caps))
return FALSE;
/* Request an extra buffer if we are keeping a ref on the last rendered buffer */
if (gst_base_sink_is_last_sample_enabled (GST_BASE_SINK (self->child)))
min_buffers++;
gst_query_add_allocation_pool (query, NULL, info.size, min_buffers, 0);
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
GST_OBJECT_LOCK (self);
if (self->allocation_meta_flags & GST_ALLOCATION_FLAG_CROP_META)
gst_query_add_allocation_meta (query, GST_VIDEO_CROP_META_API_TYPE, NULL);
if (self->allocation_meta_flags &
GST_ALLOCATION_FLAG_OVERLAY_COMPOSITION_META)
gst_query_add_allocation_meta (query,
GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, NULL);
GST_OBJECT_UNLOCK (self);
/* add here any meta API that would help support zero-copy */
return TRUE;
}
static void
gst_fake_video_sink_proxy_properties (GstFakeVideoSink * self,
GstElement * child)
{
static gsize initialized = 0;
if (g_once_init_enter (&initialized)) {
gst_fake_sink_proxy_properties (GST_ELEMENT_CAST (self), child, PROP_LAST);
g_once_init_leave (&initialized, 1);
}
}
static void
gst_fake_video_sink_proxy_handoff (GstElement * element, GstBuffer * buffer,
GstPad * pad, GstFakeVideoSink * self)
{
g_signal_emit (self, gst_fake_video_sink_signals[SIGNAL_HANDOFF], 0,
buffer, self->sinkpad);
}
static void
gst_fake_video_sink_proxy_preroll_handoff (GstElement * element,
GstBuffer * buffer, GstPad * pad, GstFakeVideoSink * self)
{
g_signal_emit (self, gst_fake_video_sink_signals[SIGNAL_PREROLL_HANDOFF], 0,
buffer, self->sinkpad);
}
static void
gst_fake_video_sink_init (GstFakeVideoSink * self)
{
GstElement *child;
GstPadTemplate *template = gst_static_pad_template_get (&sink_factory);
child = gst_element_factory_make ("fakesink", "sink");
self->allocation_meta_flags = ALLOCATION_META_DEFAULT_FLAGS;
if (child) {
GstPad *sink_pad = gst_element_get_static_pad (child, "sink");
GstPad *ghost_pad;
/* mimic GstVideoSink base class */
g_object_set (child, "max-lateness", 5 * GST_MSECOND,
"processing-deadline", 15 * GST_MSECOND, "qos", TRUE, "sync", TRUE,
NULL);
gst_bin_add (GST_BIN (self), child);
self->sinkpad = ghost_pad =
gst_ghost_pad_new_from_template ("sink", sink_pad, template);
gst_object_unref (template);
gst_element_add_pad (GST_ELEMENT (self), ghost_pad);
gst_object_unref (sink_pad);
gst_pad_set_query_function (ghost_pad, gst_fake_video_sink_query);
self->child = child;
gst_fake_video_sink_proxy_properties (self, child);
g_signal_connect (child, "handoff",
G_CALLBACK (gst_fake_video_sink_proxy_handoff), self);
g_signal_connect (child, "preroll-handoff",
G_CALLBACK (gst_fake_video_sink_proxy_preroll_handoff), self);
} else {
g_warning ("Check your GStreamer installation, "
"core element 'fakesink' is missing.");
}
}
static void
gst_fake_video_sink_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstFakeVideoSink *self = GST_FAKE_VIDEO_SINK (object);
switch (property_id) {
case PROP_ALLOCATION_META_FLAGS:
GST_OBJECT_LOCK (self);
g_value_set_flags (value, self->allocation_meta_flags);
GST_OBJECT_UNLOCK (self);
break;
default:
g_object_get_property (G_OBJECT (self->child), pspec->name, value);
break;
}
}
static void
gst_fake_video_sink_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstFakeVideoSink *self = GST_FAKE_VIDEO_SINK (object);
switch (property_id) {
case PROP_ALLOCATION_META_FLAGS:
GST_OBJECT_LOCK (self);
self->allocation_meta_flags = g_value_get_flags (value);
GST_OBJECT_UNLOCK (self);
break;
default:
g_object_set_property (G_OBJECT (self->child), pspec->name, value);
break;
}
}
static void
gst_fake_video_sink_class_init (GstFakeVideoSinkClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->get_property = gst_fake_video_sink_get_property;
object_class->set_property = gst_fake_video_sink_set_property;
gst_element_class_add_static_pad_template (element_class, &sink_factory);
gst_element_class_set_static_metadata (element_class, "Fake Video Sink",
"Video/Sink", "Fake video display that allows zero-copy",
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
/**
* GstFakeVideoSink:allocation-meta-flags
*
* Control the behaviour of the sink allocation query handler.
*
* Since: 1.18
*/
g_object_class_install_property (object_class, PROP_ALLOCATION_META_FLAGS,
g_param_spec_flags ("allocation-meta-flags", "Flags",
"Flags to control behaviour",
GST_TYPE_FAKE_VIDEO_SINK_ALLOCATION_META_FLAGS,
ALLOCATION_META_DEFAULT_FLAGS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstFakeVideoSink::handoff:
* @fakevideosink: the fakevideosink instance
* @buffer: the buffer that just has been received
* @pad: the pad that received it
*
* This signal gets emitted before unreffing the buffer.
*
* Since: 1.22
*/
gst_fake_video_sink_signals[SIGNAL_HANDOFF] =
g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstFakeVideoSinkClass, handoff), NULL, NULL,
NULL, G_TYPE_NONE, 2, GST_TYPE_BUFFER | G_SIGNAL_TYPE_STATIC_SCOPE,
GST_TYPE_PAD);
/**
* GstFakeVideoSink::preroll-handoff:
* @fakevideosink: the fakevideosink instance
* @buffer: the buffer that just has been received
* @pad: the pad that received it
*
* This signal gets emitted before unreffing the buffer.
*
* Since: 1.22
*/
gst_fake_video_sink_signals[SIGNAL_PREROLL_HANDOFF] =
g_signal_new ("preroll-handoff", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstFakeVideoSinkClass,
preroll_handoff), NULL, NULL, NULL, G_TYPE_NONE, 2,
GST_TYPE_BUFFER | G_SIGNAL_TYPE_STATIC_SCOPE, GST_TYPE_PAD);
gst_type_mark_as_plugin_api (GST_TYPE_FAKE_VIDEO_SINK_ALLOCATION_META_FLAGS,
0);
}