gstreamer/gst-libs/gst/gl/gstglbuffer.c

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/*
* GStreamer
* Copyright (C) 2007 David 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstglbuffer.h"
static GObjectClass* gst_gl_buffer_parent_class;
static void
gst_gl_buffer_finalize (GstGLBuffer* buffer)
{
//blocking call, put the texture in the pool
gst_gl_display_del_texture (buffer->display, buffer->texture,
buffer->width, buffer->height);
g_object_unref (buffer->display);
GST_MINI_OBJECT_CLASS (gst_gl_buffer_parent_class)->
finalize (GST_MINI_OBJECT (buffer));
}
static void
gst_gl_buffer_init (GstGLBuffer* buffer, gpointer g_class)
{
buffer->display = NULL;
buffer->width = 0;
buffer->height = 0;
buffer->texture = 0;
}
static void
gst_gl_buffer_class_init (gpointer g_class, gpointer class_data)
{
GstMiniObjectClass* mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
gst_gl_buffer_parent_class = g_type_class_peek_parent (g_class);
mini_object_class->finalize = (GstMiniObjectFinalizeFunction)
gst_gl_buffer_finalize;
}
GType
gst_gl_buffer_get_type (void)
{
static GType _gst_gl_buffer_type;
if (G_UNLIKELY (_gst_gl_buffer_type == 0)) {
static const GTypeInfo info = {
sizeof (GstBufferClass),
NULL,
NULL,
gst_gl_buffer_class_init,
NULL,
NULL,
sizeof (GstGLBuffer),
0,
(GInstanceInitFunc) gst_gl_buffer_init,
NULL
};
_gst_gl_buffer_type = g_type_register_static (GST_TYPE_BUFFER,
"GstGLBuffer", &info, 0);
}
return _gst_gl_buffer_type;
}
GstGLBuffer*
gst_gl_buffer_new (GstGLDisplay* display,
gint gl_width, gint gl_height)
{
GstGLBuffer* gl_buffer = (GstGLBuffer *) gst_mini_object_new (GST_TYPE_GL_BUFFER);
gl_buffer->display = g_object_ref (display);
gl_buffer->width = gl_width;
gl_buffer->height = gl_height;
//it does not depends on the video format because gl buffer has always one texture.
//the one attached to the upload FBO
GST_BUFFER_SIZE (gl_buffer) = gst_gl_buffer_get_size (gl_width, gl_height);
//blocking call, generate a texture using the pool
gst_gl_display_gen_texture (gl_buffer->display, &gl_buffer->texture, gl_width, gl_height) ;
return gl_buffer;
}
gint
gst_gl_buffer_get_size (gint width, gint height)
{
//this is not strictly true, but it's used for compatibility with
//queue and BaseTransform
return width * height * 4;
}
gboolean
gst_gl_buffer_parse_caps (GstCaps* caps, gint* width, gint* height)
{
GstStructure* structure = gst_caps_get_structure (caps, 0);
gboolean ret = gst_structure_has_name (structure, "video/x-raw-gl");
if (!ret)
return ret;
ret = gst_structure_get_int (structure, "width", width);
ret &= gst_structure_get_int (structure, "height", height);
return ret;
}