gstreamer/ext/qt/gstqtsink.cc

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/*
* GStreamer
* Copyright (C) 2015 Matthew Waters <matthew@centricular.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:gstqtsink
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstqtsink.h"
#include <QtGui/QGuiApplication>
#include <gst/gl/gstglfuncs.h>
#define GST_CAT_DEFAULT gst_debug_qt_gl_sink
GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
static void gst_qt_sink_finalize (GObject * object);
static void gst_qt_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * param_spec);
static void gst_qt_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * param_spec);
static gboolean gst_qt_sink_stop (GstBaseSink * bsink);
static gboolean gst_qt_sink_query (GstBaseSink * bsink, GstQuery * query);
static GstStateChangeReturn
gst_qt_sink_change_state (GstElement * element, GstStateChange transition);
static void gst_qt_sink_get_times (GstBaseSink * bsink, GstBuffer * buf,
GstClockTime * start, GstClockTime * end);
static gboolean gst_qt_sink_set_caps (GstBaseSink * bsink, GstCaps * caps);
static GstFlowReturn gst_qt_sink_show_frame (GstVideoSink * bsink,
GstBuffer * buf);
static gboolean gst_qt_sink_propose_allocation (GstBaseSink * bsink,
GstQuery * query);
static GstStaticPadTemplate gst_qt_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(" GST_CAPS_FEATURE_MEMORY_GL_MEMORY "), "
"format = (string) RGBA, "
"width = " GST_VIDEO_SIZE_RANGE ", "
"height = " GST_VIDEO_SIZE_RANGE ", "
"framerate = " GST_VIDEO_FPS_RANGE ", "
"texture-target = (string) 2D"));
#define DEFAULT_FORCE_ASPECT_RATIO TRUE
#define DEFAULT_PAR_N 0
#define DEFAULT_PAR_D 1
enum
{
ARG_0,
PROP_WIDGET,
PROP_FORCE_ASPECT_RATIO,
PROP_PIXEL_ASPECT_RATIO,
};
enum
{
SIGNAL_0,
LAST_SIGNAL
};
#define gst_qt_sink_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstQtSink, gst_qt_sink,
GST_TYPE_VIDEO_SINK, GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT,
"qtsink", 0, "Qt Video Sink"));
static void
gst_qt_sink_class_init (GstQtSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
GstVideoSinkClass *gstvideosink_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesink_class = (GstBaseSinkClass *) klass;
gstvideosink_class = (GstVideoSinkClass *) klass;
gobject_class->set_property = gst_qt_sink_set_property;
gobject_class->get_property = gst_qt_sink_get_property;
gst_element_class_set_metadata (gstelement_class, "Qt Video Sink",
"Sink/Video", "A video sink that renders to a QQuickItem",
"Matthew Waters <matthew@centricular.com>");
g_object_class_install_property (gobject_class, PROP_WIDGET,
g_param_spec_pointer ("widget", "QQuickItem",
"The QQuickItem to place in the object hierarchy",
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_FORCE_ASPECT_RATIO,
g_param_spec_boolean ("force-aspect-ratio",
"Force aspect ratio",
"When enabled, scaling will respect original aspect ratio",
DEFAULT_FORCE_ASPECT_RATIO,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_PIXEL_ASPECT_RATIO,
gst_param_spec_fraction ("pixel-aspect-ratio", "Pixel Aspect Ratio",
"The pixel aspect ratio of the device", DEFAULT_PAR_N, DEFAULT_PAR_D,
G_MAXINT, 1, 1, 1,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
gst_element_class_add_static_pad_template (gstelement_class, &gst_qt_sink_template);
gobject_class->finalize = gst_qt_sink_finalize;
gstelement_class->change_state = gst_qt_sink_change_state;
gstbasesink_class->query = gst_qt_sink_query;
gstbasesink_class->set_caps = gst_qt_sink_set_caps;
gstbasesink_class->get_times = gst_qt_sink_get_times;
gstbasesink_class->propose_allocation = gst_qt_sink_propose_allocation;
gstbasesink_class->stop = gst_qt_sink_stop;
gstvideosink_class->show_frame = gst_qt_sink_show_frame;
}
static void
gst_qt_sink_init (GstQtSink * qt_sink)
{
qt_sink->widget = QSharedPointer<QtGLVideoItemInterface>();
}
static void
gst_qt_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstQtSink *qt_sink = GST_QT_SINK (object);
switch (prop_id) {
case PROP_WIDGET: {
QtGLVideoItem *qt_item = static_cast<QtGLVideoItem *> (g_value_get_pointer (value));
if (qt_item)
qt_sink->widget = qt_item->getInterface();
else
qt_sink->widget.clear();
break;
}
case PROP_FORCE_ASPECT_RATIO:
g_return_if_fail (qt_sink->widget);
qt_sink->widget->setForceAspectRatio (g_value_get_boolean (value));
break;
case PROP_PIXEL_ASPECT_RATIO:
g_return_if_fail (qt_sink->widget);
qt_sink->widget->setDAR (gst_value_get_fraction_numerator (value),
gst_value_get_fraction_denominator (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
_reset (GstQtSink * qt_sink)
{
if (qt_sink->display) {
gst_object_unref (qt_sink->display);
qt_sink->display = NULL;
}
if (qt_sink->context) {
gst_object_unref (qt_sink->context);
qt_sink->context = NULL;
}
if (qt_sink->qt_context) {
gst_object_unref (qt_sink->qt_context);
qt_sink->qt_context = NULL;
}
}
static void
gst_qt_sink_finalize (GObject * object)
{
GstQtSink *qt_sink = GST_QT_SINK (object);
_reset (qt_sink);
qt_sink->widget.clear();
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_qt_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstQtSink *qt_sink = GST_QT_SINK (object);
switch (prop_id) {
case PROP_WIDGET:
/* This is not really safe - the app needs to be
* sure the widget is going to be kept alive or
* this can crash */
if (qt_sink->widget)
g_value_set_pointer (value, qt_sink->widget->videoItem());
else
g_value_set_pointer (value, NULL);
break;
case PROP_FORCE_ASPECT_RATIO:
if (qt_sink->widget)
g_value_set_boolean (value, qt_sink->widget->getForceAspectRatio ());
else
g_value_set_boolean (value, DEFAULT_FORCE_ASPECT_RATIO);
break;
case PROP_PIXEL_ASPECT_RATIO:
if (qt_sink->widget) {
gint num, den;
qt_sink->widget->getDAR (&num, &den);
gst_value_set_fraction (value, num, den);
} else {
gst_value_set_fraction (value, DEFAULT_PAR_N, DEFAULT_PAR_D);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_qt_sink_query (GstBaseSink * bsink, GstQuery * query)
{
GstQtSink *qt_sink = GST_QT_SINK (bsink);
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
{
if (gst_gl_handle_context_query ((GstElement *) qt_sink, query,
qt_sink->display, qt_sink->context, qt_sink->qt_context))
return TRUE;
/* fallthrough */
}
default:
res = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
}
return res;
}
static gboolean
gst_qt_sink_stop (GstBaseSink * bsink)
{
return TRUE;
}
static GstStateChangeReturn
gst_qt_sink_change_state (GstElement * element, GstStateChange transition)
{
GstQtSink *qt_sink = GST_QT_SINK (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
QGuiApplication *app;
GST_DEBUG ("changing state: %s => %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
app = static_cast<QGuiApplication *> (QCoreApplication::instance ());
if (!app) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("%s", "Failed to connect to Qt"),
("%s", "Could not retrieve QGuiApplication instance"));
return GST_STATE_CHANGE_FAILURE;
}
if (!qt_sink->widget) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("%s", "Required property \'widget\' not set"),
(NULL));
return GST_STATE_CHANGE_FAILURE;
}
if (!qt_sink->widget->initWinSys()) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("%s", "Could not initialize window system"),
(NULL));
return GST_STATE_CHANGE_FAILURE;
}
qt_sink->display = qt_sink->widget->getDisplay();
qt_sink->context = qt_sink->widget->getContext();
qt_sink->qt_context = qt_sink->widget->getQtContext();
if (!qt_sink->display || !qt_sink->context || !qt_sink->qt_context) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("%s", "Could not retrieve window system OpenGL configuration"),
(NULL));
return GST_STATE_CHANGE_FAILURE;
}
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (qt_sink->widget)
qt_sink->widget->setBuffer(NULL);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static void
gst_qt_sink_get_times (GstBaseSink * bsink, GstBuffer * buf,
GstClockTime * start, GstClockTime * end)
{
GstQtSink *qt_sink;
qt_sink = GST_QT_SINK (bsink);
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
*start = GST_BUFFER_TIMESTAMP (buf);
if (GST_BUFFER_DURATION_IS_VALID (buf))
*end = *start + GST_BUFFER_DURATION (buf);
else {
if (GST_VIDEO_INFO_FPS_N (&qt_sink->v_info) > 0) {
*end = *start +
gst_util_uint64_scale_int (GST_SECOND,
GST_VIDEO_INFO_FPS_D (&qt_sink->v_info),
GST_VIDEO_INFO_FPS_N (&qt_sink->v_info));
}
}
}
}
gboolean
gst_qt_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
{
GstQtSink *qt_sink = GST_QT_SINK (bsink);
GST_DEBUG ("set caps with %" GST_PTR_FORMAT, caps);
if (!gst_video_info_from_caps (&qt_sink->v_info, caps))
return FALSE;
if (!qt_sink->widget)
return FALSE;
return qt_sink->widget->setCaps(caps);
}
static GstFlowReturn
gst_qt_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
{
GstQtSink *qt_sink;
GST_TRACE ("rendering buffer:%p", buf);
qt_sink = GST_QT_SINK (vsink);
if (qt_sink->widget)
qt_sink->widget->setBuffer(buf);
return GST_FLOW_OK;
}
static gboolean
gst_qt_sink_propose_allocation (GstBaseSink * bsink, GstQuery * query)
{
GstQtSink *qt_sink = GST_QT_SINK (bsink);
GstBufferPool *pool;
GstStructure *config;
GstCaps *caps;
guint size;
gboolean need_pool;
if (!qt_sink->display || !qt_sink->context)
return FALSE;
gst_query_parse_allocation (query, &caps, &need_pool);
if (caps == NULL)
goto no_caps;
/* FIXME re-using buffer pool breaks renegotiation */
if ((pool = qt_sink->pool))
gst_object_ref (pool);
if (pool != NULL) {
GstCaps *pcaps;
/* we had a pool, check caps */
GST_DEBUG_OBJECT (qt_sink, "check existing pool caps");
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_get_params (config, &pcaps, &size, NULL, NULL);
if (!gst_caps_is_equal (caps, pcaps)) {
GST_DEBUG_OBJECT (qt_sink, "pool has different caps");
/* different caps, we can't use this pool */
gst_object_unref (pool);
pool = NULL;
}
gst_structure_free (config);
} else {
GstVideoInfo info;
if (!gst_video_info_from_caps (&info, caps))
goto invalid_caps;
/* the normal size of a frame */
size = info.size;
}
if (pool == NULL && need_pool) {
GST_DEBUG_OBJECT (qt_sink, "create new pool");
pool = gst_gl_buffer_pool_new (qt_sink->context);
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, caps, size, 0, 0);
if (!gst_buffer_pool_set_config (pool, config))
goto config_failed;
}
/* we need at least 2 buffer because we hold on to the last one */
gst_query_add_allocation_pool (query, pool, size, 2, 0);
if (pool)
gst_object_unref (pool);
/* we also support various metadata */
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, 0);
if (qt_sink->context->gl_vtable->FenceSync)
gst_query_add_allocation_meta (query, GST_GL_SYNC_META_API_TYPE, 0);
return TRUE;
/* ERRORS */
no_caps:
{
GST_DEBUG_OBJECT (bsink, "no caps specified");
return FALSE;
}
invalid_caps:
{
GST_DEBUG_OBJECT (bsink, "invalid caps specified");
return FALSE;
}
config_failed:
{
GST_DEBUG_OBJECT (bsink, "failed setting config");
return FALSE;
}
}