gstreamer/gst-libs/gst/gl/cocoa/gstgldisplay_cocoa.m

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/*
* GStreamer
* Copyright (C) 2015 Julien Isorce <julien.isorce@gmail.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 <Cocoa/Cocoa.h>
#include <gst/gl/cocoa/gstgldisplay_cocoa.h>
GST_DEBUG_CATEGORY_STATIC (gst_gl_display_debug);
#define GST_CAT_DEFAULT gst_gl_display_debug
G_DEFINE_TYPE (GstGLDisplayCocoa, gst_gl_display_cocoa, GST_TYPE_GL_DISPLAY);
static void gst_gl_display_cocoa_finalize (GObject * object);
static guintptr gst_gl_display_cocoa_get_handle (GstGLDisplay * display);
/* Define this if the GLib patch from
* https://bugzilla.gnome.org/show_bug.cgi?id=741450
* is used
*/
#ifndef GSTREAMER_GLIB_COCOA_NSAPPLICATION
static GstGLDisplayCocoa *singleton = NULL;
static gint nsapp_source_id = 0;
static GMutex nsapp_lock;
static GCond nsapp_cond;
static gboolean
gst_gl_display_cocoa_nsapp_iteration (gpointer data)
{
NSEvent *event = nil;
if (![NSThread isMainThread]) {
GST_WARNING ("NSApp iteration not running in the main thread");
return FALSE;
}
while ((event = ([NSApp nextEventMatchingMask:NSAnyEventMask
untilDate:[NSDate dateWithTimeIntervalSinceNow:0.05]
inMode:NSDefaultRunLoopMode dequeue:YES])) != nil) {
[NSApp sendEvent:event];
}
return TRUE;
}
static void
gst_gl_display_cocoa_open_and_attach_source (gpointer data)
{
if ([NSThread isMainThread]) {
/* The sharedApplication class method initializes
* the display environment and connects your program
* to the window server and the display server.
* It has to be done in the main thread.
*/
[NSApplication sharedApplication];
GST_DEBUG ("Custom NSApp initialization done");
nsapp_source_id = g_timeout_add (60, gst_gl_display_cocoa_nsapp_iteration,
NULL);
GST_DEBUG ("NSApp iteration loop attached, id %d", nsapp_source_id);
}
}
static gboolean
gst_gl_display_cocoa_init_nsapp (gpointer data)
{
g_mutex_lock (&nsapp_lock);
gst_gl_display_cocoa_open_and_attach_source (data);
g_cond_signal (&nsapp_cond);
g_mutex_unlock (&nsapp_lock);
return FALSE;
}
static GstGLDisplayCocoa *
gst_gl_display_cocoa_setup_nsapp (gpointer data)
{
GMainContext *context = g_main_context_default ();
gint delta_ms = 0;
g_mutex_lock (&nsapp_lock);
if (singleton) {
GST_DEBUG ("Get existing display");
singleton = gst_object_ref (singleton);
g_mutex_unlock (&nsapp_lock);
return singleton;
}
if (NSApp != nil && !singleton) {
GstGLDisplayCocoa *ret = g_object_new (GST_TYPE_GL_DISPLAY_COCOA, NULL);
g_mutex_unlock (&nsapp_lock);
return ret;
}
/* All application have to start with [NSApplication sharedApplication]
* so if NSApp is nil here let's assume this is a debugging application
* that runs a glib main loop. */
g_assert (NSApp == nil);
GST_DEBUG ("The application has not initialized NSApp");
if ([NSThread isMainThread]) {
GST_DEBUG ("Setting up NSApp from the main thread");
if (g_main_context_is_owner (context)) {
GST_DEBUG ("The main thread own the context");
gst_gl_display_cocoa_open_and_attach_source (data);
} else if (g_main_context_acquire (context)) {
GST_DEBUG ("The main loop should be shortly running in the main thread");
gst_gl_display_cocoa_open_and_attach_source (data);
g_main_context_release (context);
} else {
GST_WARNING ("Main loop running in another thread");
}
} else {
GST_DEBUG ("Setting up NSApp not from the main thread");
if (g_main_context_is_owner (context)) {
GST_WARNING ("Default context not own by the main thread");
delta_ms = -1;
} else if (g_main_context_acquire (context)) {
GST_DEBUG ("The main loop should be shortly running in the main thread");
delta_ms = 1000;
g_main_context_release (context);
} else {
GST_DEBUG ("Main loop running in main thread");
delta_ms = 500;
}
if (delta_ms > 0) {
gint64 end_time = g_get_monotonic_time () + delta_ms * 1000;;
g_idle_add_full (G_PRIORITY_HIGH, gst_gl_display_cocoa_init_nsapp, data, NULL);
g_cond_wait_until (&nsapp_cond, &nsapp_lock, end_time);
}
}
if (NSApp == nil) {
GST_ERROR ("Custom NSApp initialization failed");
} else {
GST_DEBUG ("Create display");
singleton = g_object_new (GST_TYPE_GL_DISPLAY_COCOA, NULL);
}
g_mutex_unlock (&nsapp_lock);
return singleton;
}
#endif
static void
gst_gl_display_cocoa_class_init (GstGLDisplayCocoaClass * klass)
{
GST_GL_DISPLAY_CLASS (klass)->get_handle =
GST_DEBUG_FUNCPTR (gst_gl_display_cocoa_get_handle);
G_OBJECT_CLASS (klass)->finalize = gst_gl_display_cocoa_finalize;
}
static void
gst_gl_display_cocoa_init (GstGLDisplayCocoa * display_cocoa)
{
GstGLDisplay *display = (GstGLDisplay *) display_cocoa;
display->type = GST_GL_DISPLAY_TYPE_COCOA;
}
static void
gst_gl_display_cocoa_finalize (GObject * object)
{
#ifndef GSTREAMER_GLIB_COCOA_NSAPPLICATION
g_mutex_lock (&nsapp_lock);
if (singleton) {
GST_DEBUG ("Destroy display");
singleton = NULL;
if (nsapp_source_id) {
GST_DEBUG ("Remove NSApp loop iteration, id %d", nsapp_source_id);
g_source_remove (nsapp_source_id);
}
nsapp_source_id = 0;
g_mutex_unlock (&nsapp_lock);
}
g_mutex_unlock (&nsapp_lock);
#endif
G_OBJECT_CLASS (gst_gl_display_cocoa_parent_class)->finalize (object);
}
/**
* gst_gl_display_cocoa_new:
*
* Create a new #GstGLDisplayCocoa.
*
* Returns: (transfer full): a new #GstGLDisplayCocoa or %NULL
*/
GstGLDisplayCocoa *
gst_gl_display_cocoa_new (void)
{
GST_DEBUG_CATEGORY_GET (gst_gl_display_debug, "gldisplay");
#ifndef GSTREAMER_GLIB_COCOA_NSAPPLICATION
return gst_gl_display_cocoa_setup_nsapp (NULL);
#else
return g_object_new (GST_TYPE_GL_DISPLAY_COCOA, NULL);
#endif
}
static guintptr
gst_gl_display_cocoa_get_handle (GstGLDisplay * display)
{
return (guintptr) NSApp;
}