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gtk: Add GtkGstBaseWidget

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This is a "pseudo" base class. Basically it's a shared instance
and class structure and a shared set of function between the
two widget. It cannot have it's own type like normal base class
since the one instance will implement GtkGLArea while the other
implements GtkDrawingAreay. To workaround this, the parent instance
and class is a union of both.

https://bugzilla.gnome.org/show_bug.cgi?id=752441
This commit is contained in:
Nicolas Dufresne 2015-07-16 12:51:34 -04:00
parent 04beac6e0f
commit ad45bcdd34
3 changed files with 414 additions and 0 deletions
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2
ext/gtk/Makefile.am
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@ -8,6 +8,8 @@ lib_LTLIBRARIES =
# source
sources = \
gtkgstbasewidget.c \
gtkgstbasewidget.h \
gtkgstwidget.c \
gtkgstwidget.h \
gstgtksink.c \

318
ext/gtk/gtkgstbasewidget.c Normal file
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@ -0,0 +1,318 @@
/*
* 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 "gtkgstbasewidget.h"
#define DEFAULT_FORCE_ASPECT_RATIO TRUE
#define DEFAULT_PAR_N 0
#define DEFAULT_PAR_D 1
#define DEFAULT_IGNORE_ALPHA TRUE
enum
{
PROP_0,
PROP_FORCE_ASPECT_RATIO,
PROP_PIXEL_ASPECT_RATIO,
PROP_IGNORE_ALPHA,
};
static void
gtk_gst_base_widget_get_preferred_width (GtkWidget * widget, gint * min,
gint * natural)
{
GtkGstBaseWidget *gst_widget = (GtkGstBaseWidget *) widget;
gint video_width = gst_widget->display_width;
if (!gst_widget->negotiated)
video_width = 10;
if (min)
*min = 1;
if (natural)
*natural = video_width;
}
static void
gtk_gst_base_widget_get_preferred_height (GtkWidget * widget, gint * min,
gint * natural)
{
GtkGstBaseWidget *gst_widget = (GtkGstBaseWidget *) widget;
gint video_height = gst_widget->display_height;
if (!gst_widget->negotiated)
video_height = 10;
if (min)
*min = 1;
if (natural)
*natural = video_height;
}
static void
gtk_gst_base_widget_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GtkGstBaseWidget *gtk_widget = GTK_GST_BASE_WIDGET (object);
switch (prop_id) {
case PROP_FORCE_ASPECT_RATIO:
gtk_widget->force_aspect_ratio = g_value_get_boolean (value);
break;
case PROP_PIXEL_ASPECT_RATIO:
gtk_widget->par_n = gst_value_get_fraction_numerator (value);
gtk_widget->par_d = gst_value_get_fraction_denominator (value);
break;
case PROP_IGNORE_ALPHA:
gtk_widget->ignore_alpha = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_gst_base_widget_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GtkGstBaseWidget *gtk_widget = GTK_GST_BASE_WIDGET (object);
switch (prop_id) {
case PROP_FORCE_ASPECT_RATIO:
g_value_set_boolean (value, gtk_widget->force_aspect_ratio);
break;
case PROP_PIXEL_ASPECT_RATIO:
gst_value_set_fraction (value, gtk_widget->par_n, gtk_widget->par_d);
break;
case PROP_IGNORE_ALPHA:
g_value_set_boolean (value, gtk_widget->ignore_alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
_queue_resize (GtkGstBaseWidget * widget)
{
GTK_GST_BASE_WIDGET_LOCK (widget);
widget->resize_id = 0;
GTK_GST_BASE_WIDGET_UNLOCK (widget);
gtk_widget_queue_resize (GTK_WIDGET (widget));
return G_SOURCE_REMOVE;
}
static gboolean
_calculate_par (GtkGstBaseWidget * widget, GstVideoInfo * info)
{
gboolean ok;
gint width, height;
gint par_n, par_d;
gint display_par_n, display_par_d;
guint display_ratio_num, display_ratio_den;
width = GST_VIDEO_INFO_WIDTH (info);
height = GST_VIDEO_INFO_HEIGHT (info);
par_n = GST_VIDEO_INFO_PAR_N (info);
par_d = GST_VIDEO_INFO_PAR_D (info);
if (!par_n)
par_n = 1;
/* get display's PAR */
if (widget->par_n != 0 && widget->par_d != 0) {
display_par_n = widget->par_n;
display_par_d = widget->par_d;
} else {
display_par_n = 1;
display_par_d = 1;
}
ok = gst_video_calculate_display_ratio (&display_ratio_num,
&display_ratio_den, width, height, par_n, par_d, display_par_n,
display_par_d);
if (!ok)
return FALSE;
GST_LOG ("PAR: %u/%u DAR:%u/%u", par_n, par_d, display_par_n, display_par_d);
if (height % display_ratio_den == 0) {
GST_DEBUG ("keeping video height");
widget->display_width = (guint)
gst_util_uint64_scale_int (height, display_ratio_num,
display_ratio_den);
widget->display_height = height;
} else if (width % display_ratio_num == 0) {
GST_DEBUG ("keeping video width");
widget->display_width = width;
widget->display_height = (guint)
gst_util_uint64_scale_int (width, display_ratio_den, display_ratio_num);
} else {
GST_DEBUG ("approximating while keeping video height");
widget->display_width = (guint)
gst_util_uint64_scale_int (height, display_ratio_num,
display_ratio_den);
widget->display_height = height;
}
GST_DEBUG ("scaling to %dx%d", widget->display_width, widget->display_height);
return TRUE;
}
static gboolean
_queue_draw (GtkGstBaseWidget * widget)
{
GTK_GST_BASE_WIDGET_LOCK (widget);
widget->draw_id = 0;
GTK_GST_BASE_WIDGET_UNLOCK (widget);
gtk_widget_queue_draw (GTK_WIDGET (widget));
return G_SOURCE_REMOVE;
}
void
gtk_gst_base_widget_class_init (GtkGstBaseWidgetClass * klass)
{
GObjectClass *gobject_klass = (GObjectClass *) klass;
GtkWidgetClass *widget_klass = (GtkWidgetClass *) klass;
gobject_klass->set_property = gtk_gst_base_widget_set_property;
gobject_klass->get_property = gtk_gst_base_widget_get_property;
g_object_class_install_property (gobject_klass, 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,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_klass, 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, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_klass, PROP_IGNORE_ALPHA,
g_param_spec_boolean ("ignore-alpha", "Ignore Alpha",
"When enabled, alpha will be ignored and converted to black",
DEFAULT_IGNORE_ALPHA, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
widget_klass->get_preferred_width = gtk_gst_base_widget_get_preferred_width;
widget_klass->get_preferred_height = gtk_gst_base_widget_get_preferred_height;
}
void
gtk_gst_base_widget_init (GtkGstBaseWidget * widget)
{
widget->force_aspect_ratio = DEFAULT_FORCE_ASPECT_RATIO;
widget->par_n = DEFAULT_PAR_N;
widget->par_d = DEFAULT_PAR_D;
widget->ignore_alpha = DEFAULT_IGNORE_ALPHA;
g_mutex_init (&widget->lock);
}
void
gtk_gst_base_widget_finalize (GObject * object)
{
GtkGstBaseWidget *widget = GTK_GST_BASE_WIDGET (object);
gst_buffer_replace (&widget->buffer, NULL);
g_mutex_clear (&widget->lock);
if (widget->draw_id)
g_source_remove (widget->draw_id);
if (widget->resize_id)
g_source_remove (widget->resize_id);
}
gboolean
gtk_gst_base_widget_set_caps (GtkGstBaseWidget * widget, GstCaps * caps)
{
GstVideoInfo v_info;
if (widget->caps && gst_caps_is_equal_fixed (widget->caps, caps))
return TRUE;
if (!gst_video_info_from_caps (&v_info, caps))
return FALSE;
GTK_GST_BASE_WIDGET_LOCK (widget);
/* FIXME this will cause black frame to be displayed, move this in the
* _queue_resize callback passing over the video info */
if (!_calculate_par (widget, &v_info)) {
GTK_GST_BASE_WIDGET_UNLOCK (widget);
return FALSE;
}
if (widget->reset)
widget->reset (widget);
gst_buffer_replace (&widget->buffer, NULL);
gst_caps_replace (&widget->caps, caps);
widget->v_info = v_info;
widget->negotiated = TRUE;
widget->new_buffer = TRUE;
if (!widget->resize_id) {
widget->resize_id = g_idle_add_full (G_PRIORITY_DEFAULT,
(GSourceFunc) _queue_resize, widget, NULL);
}
GTK_GST_BASE_WIDGET_UNLOCK (widget);
return TRUE;
}
void
gtk_gst_base_widget_set_buffer (GtkGstBaseWidget * widget, GstBuffer * buffer)
{
/* As we have no type, this is better then no check */
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (buffer == NULL || widget->negotiated);
GTK_GST_BASE_WIDGET_LOCK (widget);
gst_buffer_replace (&widget->buffer, buffer);
widget->new_buffer = TRUE;
if (!widget->draw_id) {
widget->draw_id = g_idle_add_full (G_PRIORITY_DEFAULT,
(GSourceFunc) _queue_draw, widget, NULL);
}
GTK_GST_BASE_WIDGET_UNLOCK (widget);
}

94
ext/gtk/gtkgstbasewidget.h Normal file
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@ -0,0 +1,94 @@
/*
* 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.
*/
#ifndef __GTK_GST_BASE_WIDGET_H__
#define __GTK_GST_BASE_WIDGET_H__
#include <gtk/gtk.h>
#include <gst/gst.h>
#include <gst/video/video.h>
#define GTK_GST_BASE_WIDGET(w) ((GtkGstBaseWidget *)(w))
#define GTK_GST_BASE_WIDGET_CLASS(k) ((GtkGstBaseWidgetClass *)(k))
#define GTK_GST_BASE_WIDGET_LOCK(w) g_mutex_lock(&((GtkGstBaseWidget*)(w))->lock)
#define GTK_GST_BASE_WIDGET_UNLOCK(w) g_mutex_unlock(&((GtkGstBaseWidget*)(w))->lock)
G_BEGIN_DECLS
typedef struct _GtkGstBaseWidget GtkGstBaseWidget;
typedef struct _GtkGstBaseWidgetClass GtkGstBaseWidgetClass;
struct _GtkGstBaseWidget
{
union {
GtkDrawingArea drawing_area;
#if GTK_CHECK_VERSION(3, 15, 0)
GtkGLArea gl_area;
#endif
} parent;
/* properties */
gboolean force_aspect_ratio;
gint par_n, par_d;
gboolean ignore_alpha;
gint display_width;
gint display_height;
gboolean negotiated;
GstBuffer *buffer;
GstVideoInfo v_info;
gboolean new_buffer;
/* Poor-man virtual */
void (*reset) (GtkGstBaseWidget * widget);
/*< private >*/
GMutex lock;
GstCaps *caps;
/* Pending queued idles callback */
guint draw_id;
guint resize_id;
};
struct _GtkGstBaseWidgetClass
{
union {
GtkDrawingAreaClass drawing_area_class;
#if GTK_CHECK_VERSION(3, 15, 0)
GtkGLAreaClass gl_area_class;
#endif
} parent_class;
};
/* For implementer */
void gtk_gst_base_widget_class_init (GtkGstBaseWidgetClass * klass);
void gtk_gst_base_widget_init (GtkGstBaseWidget * widget);
void gtk_gst_base_widget_finalize (GObject * object);
/* API */
gboolean gtk_gst_base_widget_set_caps (GtkGstBaseWidget * widget, GstCaps *caps);
void gtk_gst_base_widget_set_buffer (GtkGstBaseWidget * widget, GstBuffer *buffer);
G_END_DECLS
#endif /* __GTK_GST_BASE_WIDGET_H__ */