gstreamer/ext/gl/gstglimagesink.h
Matthew Waters 6491af9ffc glupload: provide the output buffer that is rendered into
Allows callers to properly reference count the buffers used for
rendering.

Fixes a redraw race in glimagesink where the previous buffer
(the one used for redraw operations) is freed as soon as the next
buffer is uploaded.

1. glimagesink uploads in _prepare() to texture n
1.1 glupload holds buffer n
2. glimagesink _render()s texture n
3. glimagesink uploads texture n+1
3.1 glupload free previous buffer which deletes texture n
3.2 glupload holds buffer n+1
4. glwindow resize/expose
5. glimagesink redraws with texture n

The race is that the buffer n (the one used for redrawing) is freed as soon as
the buffer n+1 arrives.  There could be any amount of time and number of
redraws between this event and when buffer n+1 is actually rendered and thus
replaces buffer n as the redraw source.

https://bugzilla.gnome.org/show_bug.cgi?id=736740
2017-12-09 19:31:46 +00:00

102 lines
2.6 KiB
C

/*
* GStreamer
* Copyright (C) 2003 Julien Moutte <julien@moutte.net>
* Copyright (C) 2005,2006,2007 David A. Schleef <ds@schleef.org>
* Copyright (C) 2008 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.
*/
#ifndef _GLIMAGESINK_H_
#define _GLIMAGESINK_H_
#include <gst/gst.h>
#include <gst/video/gstvideosink.h>
#include <gst/video/video.h>
#include <gst/gl/gl.h>
G_BEGIN_DECLS
GST_DEBUG_CATEGORY_EXTERN (gst_debug_glimage_sink);
#define GST_TYPE_GLIMAGE_SINK \
(gst_glimage_sink_get_type())
#define GST_GLIMAGE_SINK(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GLIMAGE_SINK,GstGLImageSink))
#define GST_GLIMAGE_SINK_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GLIMAGE_SINK,GstGLImageSinkClass))
#define GST_IS_GLIMAGE_SINK(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GLIMAGE_SINK))
#define GST_IS_GLIMAGE_SINK_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GLIMAGE_SINK))
typedef struct _GstGLImageSink GstGLImageSink;
typedef struct _GstGLImageSinkClass GstGLImageSinkClass;
struct _GstGLImageSink
{
GstVideoSink video_sink;
//properties
gchar *display_name;
guintptr window_id;
guintptr new_window_id;
gulong mouse_sig_id;
gulong key_sig_id;
//caps
GstVideoInfo info;
GstGLDisplay *display;
GstGLContext *context;
GstGLContext *other_context;
GstGLUpload *upload;
guint next_tex;
GstBuffer *next_buffer;
volatile gint to_quit;
gboolean keep_aspect_ratio;
gint par_n, par_d;
GstBufferPool *pool;
/* avoid replacing the stored_buffer while drawing */
GMutex drawing_lock;
GstBuffer *stored_buffer;
GLuint redisplay_texture;
#if GST_GL_HAVE_GLES2
GstGLShader *redisplay_shader;
GLint redisplay_attr_position_loc;
GLint redisplay_attr_texture_loc;
#endif
};
struct _GstGLImageSinkClass
{
GstVideoSinkClass video_sink_class;
};
GType gst_glimage_sink_get_type(void);
G_END_DECLS
#endif