gstreamer/ext/gtk/gtkgstwidget.c
Matthew Waters a959c410d9 Implement gtk sinks
two sinks are provided.  gtksink which is a cairo/software based renderer
and gtkglsink which utilises the GL support in gtk and gstreamer.
2015-06-11 22:01:03 +10:00

240 lines
6.3 KiB
C

/*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include "gtkgstwidget.h"
#include <gst/video/video.h>
/**
* SECTION:gtkgstwidget
* @short_description: a #GtkWidget that renders GStreamer video #GstBuffers
* @see_also: #GtkDrawingArea, #GstBuffer
*
* #GtkGstWidget is an #GtkWidget that renders GStreamer video buffers.
*/
G_DEFINE_TYPE (GtkGstWidget, gtk_gst_widget, GTK_TYPE_DRAWING_AREA);
#define GTK_GST_WIDGET_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
GTK_TYPE_GST_WIDGET, GtkGstWidgetPrivate))
struct _GtkGstWidgetPrivate
{
GMutex lock;
gboolean negotiated;
GstBuffer *buffer;
GstCaps *caps;
GstVideoInfo v_info;
};
static void
gtk_gst_widget_get_preferred_width (GtkWidget * widget, gint * min,
gint * natural)
{
GtkGstWidget *gst_widget = (GtkGstWidget *) widget;
gint video_width = GST_VIDEO_INFO_WIDTH (&gst_widget->priv->v_info);
if (!gst_widget->priv->negotiated)
video_width = 10;
if (min)
*min = 1;
if (natural)
*natural = video_width;
}
static void
gtk_gst_widget_get_preferred_height (GtkWidget * widget, gint * min,
gint * natural)
{
GtkGstWidget *gst_widget = (GtkGstWidget *) widget;
gint video_height = GST_VIDEO_INFO_HEIGHT (&gst_widget->priv->v_info);
if (!gst_widget->priv->negotiated)
video_height = 10;
if (min)
*min = 1;
if (natural)
*natural = video_height;
}
static gboolean
gtk_gst_widget_draw (GtkWidget * widget, cairo_t * cr)
{
GtkGstWidget *gst_widget = (GtkGstWidget *) widget;
guint widget_width, widget_height;
cairo_surface_t *surface;
GstVideoFrame frame;
widget_width = gtk_widget_get_allocated_width (widget);
widget_height = gtk_widget_get_allocated_height (widget);
g_mutex_lock (&gst_widget->priv->lock);
/* failed to map the video frame */
if (gst_widget->priv->negotiated && gst_widget->priv->buffer
&& gst_video_frame_map (&frame, &gst_widget->priv->v_info,
gst_widget->priv->buffer, GST_MAP_READ)) {
gdouble scale_x =
(gdouble) widget_width / GST_VIDEO_INFO_WIDTH (&frame.info);
gdouble scale_y =
(gdouble) widget_height / GST_VIDEO_INFO_HEIGHT (&frame.info);
gst_widget->priv->v_info = frame.info;
surface = cairo_image_surface_create_for_data (frame.data[0],
CAIRO_FORMAT_ARGB32, frame.info.width, frame.info.height,
frame.info.stride[0]);
cairo_scale (cr, scale_x, scale_y);
cairo_rectangle (cr, 0, 0, widget_width, widget_height);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_surface_destroy (surface);
gst_video_frame_unmap (&frame);
} else {
GdkRGBA color;
gtk_style_context_get_color (gtk_widget_get_style_context (widget), 0,
&color);
gdk_cairo_set_source_rgba (cr, &color);
cairo_rectangle (cr, 0, 0, widget_width, widget_height);
cairo_fill (cr);
}
g_mutex_unlock (&gst_widget->priv->lock);
return FALSE;
}
static void
gtk_gst_widget_finalize (GObject * object)
{
GtkGstWidget *widget = GTK_GST_WIDGET_CAST (object);
gst_buffer_replace (&widget->priv->buffer, NULL);
g_mutex_clear (&widget->priv->lock);
G_OBJECT_CLASS (gtk_gst_widget_parent_class)->finalize (object);
}
static void
gtk_gst_widget_class_init (GtkGstWidgetClass * klass)
{
GtkWidgetClass *widget_klass = (GtkWidgetClass *) klass;
g_type_class_add_private (klass, sizeof (GtkGstWidgetPrivate));
widget_klass->draw = gtk_gst_widget_draw;
widget_klass->get_preferred_width = gtk_gst_widget_get_preferred_width;
widget_klass->get_preferred_height = gtk_gst_widget_get_preferred_height;
G_OBJECT_CLASS (klass)->finalize = gtk_gst_widget_finalize;
}
static void
gtk_gst_widget_init (GtkGstWidget * widget)
{
widget->priv = GTK_GST_WIDGET_GET_PRIVATE (widget);
g_mutex_init (&widget->priv->lock);
}
GtkWidget *
gtk_gst_widget_new (void)
{
return (GtkWidget *) g_object_new (GTK_TYPE_GST_WIDGET, NULL);
}
static gboolean
_queue_draw (GtkGstWidget * widget)
{
gtk_widget_queue_draw (GTK_WIDGET (widget));
return G_SOURCE_REMOVE;
}
void
gtk_gst_widget_set_buffer (GtkGstWidget * widget, GstBuffer * buffer)
{
GMainContext *main_context = g_main_context_default ();
g_return_if_fail (GTK_IS_GST_WIDGET (widget));
g_return_if_fail (widget->priv->negotiated);
g_mutex_lock (&widget->priv->lock);
gst_buffer_replace (&widget->priv->buffer, buffer);
g_mutex_unlock (&widget->priv->lock);
g_main_context_invoke (main_context, (GSourceFunc) _queue_draw, widget);
}
static gboolean
_queue_resize (GtkGstWidget * widget)
{
gtk_widget_queue_resize (GTK_WIDGET (widget));
return G_SOURCE_REMOVE;
}
gboolean
gtk_gst_widget_set_caps (GtkGstWidget * widget, GstCaps * caps)
{
GMainContext *main_context = g_main_context_default ();
GstVideoInfo v_info;
g_return_val_if_fail (GTK_IS_GST_WIDGET (widget), FALSE);
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
if (widget->priv->caps && gst_caps_is_equal_fixed (widget->priv->caps, caps))
return TRUE;
if (!gst_video_info_from_caps (&v_info, caps))
return FALSE;
/* FIXME: support other formats */
g_return_val_if_fail (GST_VIDEO_INFO_FORMAT (&v_info) ==
GST_VIDEO_FORMAT_BGRA, FALSE);
g_mutex_lock (&widget->priv->lock);
gst_caps_replace (&widget->priv->caps, caps);
widget->priv->v_info = v_info;
widget->priv->negotiated = TRUE;
g_mutex_unlock (&widget->priv->lock);
gtk_widget_queue_resize (GTK_WIDGET (widget));
g_main_context_invoke (main_context, (GSourceFunc) _queue_resize, widget);
return TRUE;
}