gstreamer/gst-libs/gst/gl/gstglupload.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

90 lines
2.8 KiB
C

/*
* GStreamer
* Copyright (C) 2012 Matthew Waters <ystree00@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 __GST_GL_UPLOAD_H__
#define __GST_GL_UPLOAD_H__
#include <gst/video/video.h>
#include <gst/gstmemory.h>
#include <gst/gl/gstgl_fwd.h>
G_BEGIN_DECLS
GType gst_gl_upload_get_type (void);
#define GST_TYPE_GL_UPLOAD (gst_gl_upload_get_type())
#define GST_GL_UPLOAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_UPLOAD,GstGLUpload))
#define GST_GL_UPLOAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_UPLOAD,GstGLUploadClass))
#define GST_IS_GL_UPLOAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_UPLOAD))
#define GST_IS_GL_UPLOAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_UPLOAD))
#define GST_GL_UPLOAD_CAST(obj) ((GstGLUpload*)(obj))
/**
* GstGLUpload
*
* Opaque #GstGLUpload object
*/
struct _GstGLUpload
{
/* <private> */
GstObject parent;
GstGLContext *context;
GstGLColorConvert *convert;
/* input data */
GstVideoInfo in_info;
gboolean initted;
GstGLMemory *in_tex[GST_VIDEO_MAX_PLANES];
GstGLMemory *out_tex;
/* <private> */
GstGLUploadPrivate *priv;
gpointer _reserved[GST_PADDING];
};
/**
* GstGLUploadClass:
*
* The #GstGLUploadClass struct only contains private data
*/
struct _GstGLUploadClass
{
GstObjectClass object_class;
};
GstGLUpload * gst_gl_upload_new (GstGLContext * context);
void gst_gl_upload_set_format (GstGLUpload * upload, GstVideoInfo * in_info);
GstVideoInfo * gst_gl_upload_get_format (GstGLUpload * upload);
gboolean gst_gl_upload_perform_with_buffer (GstGLUpload * upload, GstBuffer * buffer, guint * tex_id, GstBuffer ** outbuf);
void gst_gl_upload_release_buffer (GstGLUpload * upload);
gboolean gst_gl_upload_perform_with_data (GstGLUpload * upload, GLuint * texture_id,
gpointer data[GST_VIDEO_MAX_PLANES], GstBuffer ** outbuf);
gboolean gst_gl_upload_perform_with_gl_texture_upload_meta (GstGLUpload *upload, GstVideoGLTextureUploadMeta *meta, guint texture_id[4], GstBuffer ** outbuf);
G_END_DECLS
#endif /* __GST_GL_UPLOAD_H__ */