gstreamer/ext/gtk/gtkgstglwidget.c

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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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include "gtkgstglwidget.h"
#include <gst/video/video.h>
#if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
#include <gdk/gdkx.h>
#include <gst/gl/x11/gstgldisplay_x11.h>
#include <gst/gl/x11/gstglcontext_glx.h>
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
#include <gdk/gdkwayland.h>
#include <gst/gl/wayland/gstgldisplay_wayland.h>
#endif
/**
* SECTION:gtkgstglwidget
* @short_description: a #GtkGLArea that renders GStreamer video #GstBuffers
* @see_also: #GtkGLArea, #GstBuffer
*
* #GtkGstGLWidget is an #GtkWidget that renders GStreamer video buffers.
*/
#define GST_CAT_DEFAULT gtk_gst_gl_widget_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
G_DEFINE_TYPE_WITH_CODE (GtkGstGLWidget, gtk_gst_gl_widget, GTK_TYPE_GL_AREA,
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "gtkgstglwidget", 0,
"Gtk Gst GL Widget"););
#define GTK_GST_GL_WIDGET_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
GTK_TYPE_GST_GL_WIDGET, GtkGstGLWidgetPrivate))
#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,
};
struct _GtkGstGLWidgetPrivate
{
GMutex lock;
/* properties */
gboolean force_aspect_ratio;
gint par_n, par_d;
gboolean ignore_alpha;
gint display_width;
gint display_height;
gboolean negotiated;
GstBuffer *buffer;
GstCaps *gl_caps;
GstCaps *caps;
GstVideoInfo v_info;
gboolean new_buffer;
gboolean initted;
GstGLDisplay *display;
GdkGLContext *gdk_context;
GstGLContext *other_context;
GstGLContext *context;
GstGLUpload *upload;
GstGLShader *shader;
GLuint vao;
GLuint vertex_buffer;
GLint attr_position;
GLint attr_texture;
GLuint current_tex;
};
static void
gtk_gst_gl_widget_get_preferred_width (GtkWidget * widget, gint * min,
gint * natural)
{
GtkGstGLWidget *gst_widget = (GtkGstGLWidget *) widget;
gint video_width = gst_widget->priv->display_width;
if (!gst_widget->priv->negotiated)
video_width = 10;
if (min)
*min = 1;
if (natural)
*natural = video_width;
}
static void
gtk_gst_gl_widget_get_preferred_height (GtkWidget * widget, gint * min,
gint * natural)
{
GtkGstGLWidget *gst_widget = (GtkGstGLWidget *) widget;
gint video_height = gst_widget->priv->display_height;
if (!gst_widget->priv->negotiated)
video_height = 10;
if (min)
*min = 1;
if (natural)
*natural = video_height;
}
static const GLfloat vertices[] = {
1.0f, 1.0f, 0.0f, 1.0f, 0.0f,
-1.0f, 1.0f, 0.0f, 0.0f, 0.0f,
-1.0f, -1.0f, 0.0f, 0.0f, 1.0f,
1.0f, -1.0f, 0.0f, 1.0f, 1.0f
};
static void
gtk_gst_gl_widget_bind_buffer (GtkGstGLWidget * gst_widget)
{
const GstGLFuncs *gl = gst_widget->priv->context->gl_vtable;
gl->BindBuffer (GL_ARRAY_BUFFER, gst_widget->priv->vertex_buffer);
/* Load the vertex position */
gl->VertexAttribPointer (gst_widget->priv->attr_position, 3, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) 0);
/* Load the texture coordinate */
gl->VertexAttribPointer (gst_widget->priv->attr_texture, 2, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat)));
gl->EnableVertexAttribArray (gst_widget->priv->attr_position);
gl->EnableVertexAttribArray (gst_widget->priv->attr_texture);
}
static void
gtk_gst_gl_widget_unbind_buffer (GtkGstGLWidget * gst_widget)
{
const GstGLFuncs *gl = gst_widget->priv->context->gl_vtable;
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
gl->DisableVertexAttribArray (gst_widget->priv->attr_position);
gl->DisableVertexAttribArray (gst_widget->priv->attr_texture);
}
static void
gtk_gst_gl_widget_init_redisplay (GtkGstGLWidget * gst_widget)
{
const GstGLFuncs *gl = gst_widget->priv->context->gl_vtable;
gst_widget->priv->shader = gst_gl_shader_new (gst_widget->priv->context);
gst_gl_shader_compile_with_default_vf_and_check
(gst_widget->priv->shader, &gst_widget->priv->attr_position,
&gst_widget->priv->attr_texture);
if (gl->GenVertexArrays) {
gl->GenVertexArrays (1, &gst_widget->priv->vao);
gl->BindVertexArray (gst_widget->priv->vao);
}
gl->GenBuffers (1, &gst_widget->priv->vertex_buffer);
gl->BindBuffer (GL_ARRAY_BUFFER, gst_widget->priv->vertex_buffer);
gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), vertices,
GL_STATIC_DRAW);
if (gl->GenVertexArrays) {
gtk_gst_gl_widget_bind_buffer (gst_widget);
gl->BindVertexArray (0);
}
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
gst_widget->priv->initted = TRUE;
}
static void
_redraw_texture (GtkGstGLWidget * gst_widget, guint tex)
{
const GstGLFuncs *gl = gst_widget->priv->context->gl_vtable;
2015-06-15 19:32:43 +00:00
const GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
if (gst_widget->priv->force_aspect_ratio) {
GstVideoRectangle src, dst, result;
gint widget_width, widget_height, widget_scale;
gl->ClearColor (0.0, 0.0, 0.0, 0.0);
gl->Clear (GL_COLOR_BUFFER_BIT);
widget_scale = gtk_widget_get_scale_factor ((GtkWidget *) gst_widget);
widget_width = gtk_widget_get_allocated_width ((GtkWidget *) gst_widget);
widget_height = gtk_widget_get_allocated_height ((GtkWidget *) gst_widget);
src.x = 0;
src.y = 0;
src.w = gst_widget->priv->display_width;
src.h = gst_widget->priv->display_height;
dst.x = 0;
dst.y = 0;
dst.w = widget_width * widget_scale;
dst.h = widget_height * widget_scale;
gst_video_sink_center_rect (src, dst, &result, TRUE);
gl->Viewport (result.x, result.y, result.w, result.h);
}
gst_gl_shader_use (gst_widget->priv->shader);
if (gl->BindVertexArray)
gl->BindVertexArray (gst_widget->priv->vao);
else
gtk_gst_gl_widget_bind_buffer (gst_widget);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, tex);
gst_gl_shader_set_uniform_1i (gst_widget->priv->shader, "tex", 0);
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
if (gl->BindVertexArray)
gl->BindVertexArray (0);
else
gtk_gst_gl_widget_unbind_buffer (gst_widget);
gl->BindTexture (GL_TEXTURE_2D, 0);
}
static gboolean
gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context)
{
GtkGstGLWidget *gst_widget = (GtkGstGLWidget *) widget;
g_mutex_lock (&gst_widget->priv->lock);
if (!gst_widget->priv->initted && gst_widget->priv->context)
gtk_gst_gl_widget_init_redisplay (gst_widget);
if (gst_widget->priv->initted && gst_widget->priv->negotiated
&& gst_widget->priv->buffer) {
GST_DEBUG ("rendering buffer %p with gdk context %p",
gst_widget->priv->buffer, context);
gst_gl_context_activate (gst_widget->priv->other_context, TRUE);
if (gst_widget->priv->new_buffer || gst_widget->priv->current_tex == 0) {
GstVideoFrame gl_frame;
GstGLSyncMeta *sync_meta;
if (!gst_video_frame_map (&gl_frame, &gst_widget->priv->v_info,
gst_widget->priv->buffer, GST_MAP_READ | GST_MAP_GL)) {
goto error;
}
sync_meta = gst_buffer_get_gl_sync_meta (gst_widget->priv->buffer);
if (sync_meta) {
gst_gl_sync_meta_set_sync_point (sync_meta, gst_widget->priv->context);
gst_gl_sync_meta_wait (sync_meta, gst_widget->priv->other_context);
}
gst_widget->priv->current_tex = *(guint *) gl_frame.data[0];
gst_video_frame_unmap (&gl_frame);
}
_redraw_texture (gst_widget, gst_widget->priv->current_tex);
gst_widget->priv->new_buffer = FALSE;
} else {
error:
/* FIXME: nothing to display */
glClearColor (0.0, 0.0, 0.0, 0.0);
glClear (GL_COLOR_BUFFER_BIT);
}
if (gst_widget->priv->other_context)
gst_gl_context_activate (gst_widget->priv->other_context, FALSE);
g_mutex_unlock (&gst_widget->priv->lock);
return FALSE;
}
typedef void (*ThreadFunc) (gpointer data);
struct invoke_context
{
ThreadFunc func;
gpointer data;
GMutex lock;
GCond cond;
gboolean fired;
};
static gboolean
_invoke_func (struct invoke_context *info)
{
g_mutex_lock (&info->lock);
info->func (info->data);
info->fired = TRUE;
g_cond_signal (&info->cond);
g_mutex_unlock (&info->lock);
return G_SOURCE_REMOVE;
}
static void
_invoke_on_main (ThreadFunc func, gpointer data)
{
GMainContext *main_context = g_main_context_default ();
struct invoke_context info;
g_mutex_init (&info.lock);
g_cond_init (&info.cond);
info.fired = FALSE;
info.func = func;
info.data = data;
g_main_context_invoke (main_context, (GSourceFunc) _invoke_func, &info);
g_mutex_lock (&info.lock);
while (!info.fired)
g_cond_wait (&info.cond, &info.lock);
g_mutex_unlock (&info.lock);
g_mutex_clear (&info.lock);
g_cond_clear (&info.cond);
}
static void
_reset_gl (GtkGstGLWidget * gst_widget)
{
const GstGLFuncs *gl = gst_widget->priv->other_context->gl_vtable;
if (!gst_widget->priv->gdk_context)
gst_widget->priv->gdk_context =
gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
if (gst_widget->priv->gdk_context == NULL)
return;
gdk_gl_context_make_current (gst_widget->priv->gdk_context);
gst_gl_context_activate (gst_widget->priv->other_context, TRUE);
if (gst_widget->priv->vao) {
gl->DeleteVertexArrays (1, &gst_widget->priv->vao);
gst_widget->priv->vao = 0;
}
if (gst_widget->priv->vertex_buffer) {
gl->DeleteBuffers (1, &gst_widget->priv->vertex_buffer);
gst_widget->priv->vertex_buffer = 0;
}
if (gst_widget->priv->upload) {
gst_object_unref (gst_widget->priv->upload);
gst_widget->priv->upload = NULL;
}
if (gst_widget->priv->shader) {
gst_object_unref (gst_widget->priv->shader);
gst_widget->priv->shader = NULL;
}
gst_gl_context_activate (gst_widget->priv->other_context, FALSE);
gst_object_unref (gst_widget->priv->other_context);
gst_widget->priv->other_context = NULL;
gdk_gl_context_clear_current ();
g_object_unref (gst_widget->priv->gdk_context);
gst_widget->priv->gdk_context = NULL;
}
static void
_reset (GtkGstGLWidget * gst_widget)
{
gst_buffer_replace (&gst_widget->priv->buffer, NULL);
gst_caps_replace (&gst_widget->priv->caps, NULL);
gst_caps_replace (&gst_widget->priv->gl_caps, NULL);
gst_widget->priv->negotiated = FALSE;
gst_widget->priv->initted = FALSE;
gst_widget->priv->vao = 0;
gst_widget->priv->vertex_buffer = 0;
gst_widget->priv->attr_position = 0;
gst_widget->priv->attr_texture = 0;
gst_widget->priv->current_tex = 0;
gst_widget->priv->new_buffer = TRUE;
}
static void
gtk_gst_gl_widget_finalize (GObject * object)
{
GtkGstGLWidget *widget = GTK_GST_GL_WIDGET_CAST (object);
g_mutex_clear (&widget->priv->lock);
_reset (widget);
if (widget->priv->other_context) {
_invoke_on_main ((ThreadFunc) _reset_gl, widget);
}
if (widget->priv->context) {
gst_object_unref (widget->priv->context);
widget->priv->context = NULL;
}
if (widget->priv->display) {
gst_object_unref (widget->priv->display);
widget->priv->display = NULL;
}
G_OBJECT_CLASS (gtk_gst_gl_widget_parent_class)->finalize (object);
}
static void
gtk_gst_gl_widget_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GtkGstGLWidget *gtk_widget = GTK_GST_GL_WIDGET (object);
switch (prop_id) {
case PROP_FORCE_ASPECT_RATIO:
gtk_widget->priv->force_aspect_ratio = g_value_get_boolean (value);
break;
case PROP_PIXEL_ASPECT_RATIO:
gtk_widget->priv->par_n = gst_value_get_fraction_numerator (value);
gtk_widget->priv->par_d = gst_value_get_fraction_denominator (value);
break;
case PROP_IGNORE_ALPHA:
gtk_widget->priv->ignore_alpha = g_value_get_boolean (value);
gtk_gl_area_set_has_alpha ((GtkGLArea *) gtk_widget,
!gtk_widget->priv->ignore_alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_gst_gl_widget_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GtkGstGLWidget *gtk_widget = GTK_GST_GL_WIDGET (object);
switch (prop_id) {
case PROP_FORCE_ASPECT_RATIO:
g_value_set_boolean (value, gtk_widget->priv->force_aspect_ratio);
break;
case PROP_PIXEL_ASPECT_RATIO:
gst_value_set_fraction (value, gtk_widget->priv->par_n,
gtk_widget->priv->par_d);
break;
case PROP_IGNORE_ALPHA:
g_value_set_boolean (value, gtk_widget->priv->ignore_alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_gst_gl_widget_class_init (GtkGstGLWidgetClass * klass)
{
GObjectClass *gobject_klass = (GObjectClass *) klass;
GtkWidgetClass *widget_klass = (GtkWidgetClass *) klass;
GtkGLAreaClass *gl_widget_klass = (GtkGLAreaClass *) klass;
g_type_class_add_private (klass, sizeof (GtkGstGLWidgetPrivate));
gobject_klass->set_property = gtk_gst_gl_widget_set_property;
gobject_klass->get_property = gtk_gst_gl_widget_get_property;
gobject_klass->finalize = gtk_gst_gl_widget_finalize;
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));
gl_widget_klass->render = gtk_gst_gl_widget_render;
widget_klass->get_preferred_width = gtk_gst_gl_widget_get_preferred_width;
widget_klass->get_preferred_height = gtk_gst_gl_widget_get_preferred_height;
}
static void
gtk_gst_gl_widget_init (GtkGstGLWidget * widget)
{
GdkDisplay *display;
widget->priv = GTK_GST_GL_WIDGET_GET_PRIVATE (widget);
widget->priv->force_aspect_ratio = DEFAULT_FORCE_ASPECT_RATIO;
widget->priv->par_n = DEFAULT_PAR_N;
widget->priv->par_d = DEFAULT_PAR_D;
widget->priv->ignore_alpha = DEFAULT_IGNORE_ALPHA;
g_mutex_init (&widget->priv->lock);
display = gdk_display_get_default ();
#if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
if (GDK_IS_X11_DISPLAY (display))
widget->priv->display = (GstGLDisplay *)
gst_gl_display_x11_new_with_display (gdk_x11_display_get_xdisplay
(display));
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
if (GDK_IS_WAYLAND_DISPLAY (display)) {
struct wl_display *wayland_display =
gdk_wayland_display_get_wl_display (display);
widget->priv->display = (GstGLDisplay *)
gst_gl_display_wayland_new_with_display (wayland_display);
}
#endif
(void) display;
if (!widget->priv->display)
widget->priv->display = gst_gl_display_new ();
gtk_gl_area_set_has_alpha ((GtkGLArea *) widget, !widget->priv->ignore_alpha);
}
GtkWidget *
gtk_gst_gl_widget_new (void)
{
return (GtkWidget *) g_object_new (GTK_TYPE_GST_GL_WIDGET, NULL);
}
static gboolean
_queue_draw (GtkGstGLWidget * widget)
{
gtk_widget_queue_draw (GTK_WIDGET (widget));
return G_SOURCE_REMOVE;
}
void
gtk_gst_gl_widget_set_buffer (GtkGstGLWidget * widget, GstBuffer * buffer)
{
GMainContext *main_context = g_main_context_default ();
g_return_if_fail (GTK_IS_GST_GL_WIDGET (widget));
2015-07-09 03:03:23 +00:00
g_return_if_fail (buffer == NULL || widget->priv->negotiated);
g_mutex_lock (&widget->priv->lock);
gst_buffer_replace (&widget->priv->buffer, buffer);
widget->priv->new_buffer = TRUE;
g_mutex_unlock (&widget->priv->lock);
g_main_context_invoke (main_context, (GSourceFunc) _queue_draw, widget);
}
static void
_get_gl_context (GtkGstGLWidget * gst_widget)
{
GstGLPlatform platform;
GstGLAPI gl_api;
guintptr gl_handle;
gtk_widget_realize (GTK_WIDGET (gst_widget));
if (gst_widget->priv->gdk_context)
g_object_unref (gst_widget->priv->gdk_context);
gst_widget->priv->gdk_context =
gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
if (gst_widget->priv->gdk_context == NULL) {
g_assert_not_reached ();
return;
}
g_object_ref (gst_widget->priv->gdk_context);
gdk_gl_context_make_current (gst_widget->priv->gdk_context);
#if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
if (GST_IS_GL_DISPLAY_X11 (gst_widget->priv->display)) {
platform = GST_GL_PLATFORM_GLX;
gl_api = gst_gl_context_get_current_gl_api (NULL, NULL);
gl_handle = gst_gl_context_get_current_gl_context (platform);
if (gl_handle)
gst_widget->priv->other_context =
gst_gl_context_new_wrapped (gst_widget->priv->display, gl_handle,
platform, gl_api);
}
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
if (GST_IS_GL_DISPLAY_WAYLAND (gst_widget->priv->display)) {
platform = GST_GL_PLATFORM_EGL;
gl_api = gst_gl_context_get_current_gl_api (NULL, NULL);
gl_handle = gst_gl_context_get_current_gl_context (platform);
if (gl_handle)
gst_widget->priv->other_context =
gst_gl_context_new_wrapped (gst_widget->priv->display, gl_handle,
platform, gl_api);
}
#endif
(void) platform;
(void) gl_api;
(void) gl_handle;
if (gst_widget->priv->other_context) {
GError *error = NULL;
gst_gl_context_activate (gst_widget->priv->other_context, TRUE);
if (!gst_gl_context_fill_info (gst_widget->priv->other_context, &error)) {
GST_ERROR ("failed to retreive gdk context info: %s", error->message);
g_object_unref (gst_widget->priv->other_context);
gst_widget->priv->other_context = NULL;
} else {
gst_gl_context_activate (gst_widget->priv->other_context, FALSE);
}
}
}
static gboolean
_queue_resize (GtkGstGLWidget * widget)
{
gtk_widget_queue_resize (GTK_WIDGET (widget));
return G_SOURCE_REMOVE;
}
gboolean
gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * widget)
{
g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (widget), FALSE);
g_mutex_lock (&widget->priv->lock);
if (widget->priv->display && widget->priv->gdk_context
&& widget->priv->other_context) {
g_mutex_unlock (&widget->priv->lock);
return TRUE;
}
if (!widget->priv->other_context) {
g_mutex_unlock (&widget->priv->lock);
_invoke_on_main ((ThreadFunc) _get_gl_context, widget);
g_mutex_lock (&widget->priv->lock);
}
if (!GST_GL_IS_CONTEXT (widget->priv->other_context)) {
g_mutex_unlock (&widget->priv->lock);
return FALSE;
}
widget->priv->context = gst_gl_context_new (widget->priv->display);
if (!widget->priv->context) {
g_mutex_unlock (&widget->priv->lock);
return FALSE;
}
gst_gl_context_create (widget->priv->context, widget->priv->other_context,
NULL);
g_mutex_unlock (&widget->priv->lock);
return TRUE;
}
static gboolean
_calculate_par (GtkGstGLWidget * 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->priv->par_n != 0 && widget->priv->par_d != 0) {
display_par_n = widget->priv->par_n;
display_par_d = widget->priv->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->priv->display_width = (guint)
gst_util_uint64_scale_int (height, display_ratio_num,
display_ratio_den);
widget->priv->display_height = height;
} else if (width % display_ratio_num == 0) {
GST_DEBUG ("keeping video width");
widget->priv->display_width = width;
widget->priv->display_height = (guint)
gst_util_uint64_scale_int (width, display_ratio_den, display_ratio_num);
} else {
GST_DEBUG ("approximating while keeping video height");
widget->priv->display_width = (guint)
gst_util_uint64_scale_int (height, display_ratio_num,
display_ratio_den);
widget->priv->display_height = height;
}
GST_DEBUG ("scaling to %dx%d", widget->priv->display_width,
widget->priv->display_height);
return TRUE;
}
gboolean
gtk_gst_gl_widget_set_caps (GtkGstGLWidget * widget, GstCaps * caps)
{
GMainContext *main_context = g_main_context_default ();
GstVideoInfo v_info;
g_return_val_if_fail (GTK_IS_GST_GL_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;
g_mutex_lock (&widget->priv->lock);
_reset (widget);
gst_caps_replace (&widget->priv->caps, caps);
widget->priv->gl_caps = gst_video_info_to_caps (&v_info);
gst_caps_set_features (widget->priv->gl_caps, 0,
gst_caps_features_from_string (GST_CAPS_FEATURE_MEMORY_GL_MEMORY));
if (!_calculate_par (widget, &v_info)) {
g_mutex_unlock (&widget->priv->lock);
return FALSE;
}
widget->priv->v_info = v_info;
widget->priv->negotiated = TRUE;
g_mutex_unlock (&widget->priv->lock);
g_main_context_invoke (main_context, (GSourceFunc) _queue_resize, widget);
return TRUE;
}
GstGLContext *
gtk_gst_gl_widget_get_gtk_context (GtkGstGLWidget * gst_widget)
{
if (!gst_widget->priv->other_context)
return NULL;
return gst_object_ref (gst_widget->priv->other_context);
}
GstGLContext *
gtk_gst_gl_widget_get_context (GtkGstGLWidget * gst_widget)
{
if (!gst_widget->priv->context)
return NULL;
return gst_object_ref (gst_widget->priv->context);
}
GstGLDisplay *
gtk_gst_gl_widget_get_display (GtkGstGLWidget * gst_widget)
{
if (!gst_widget->priv->display)
return NULL;
return gst_object_ref (gst_widget->priv->display);
}