gstreamer/ext/gl/gstglcolorscale.c
2021-03-16 17:58:59 +00:00

189 lines
5.9 KiB
C

/*
* GStreamer
* 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.
*/
/**
* SECTION:element-glcolorscale
* @title: glcolorscale
*
* glcolorscale implements scaling of GL video frames, equivalent to
* #videoscale. The initial implementation also performed colorspace
* conversion, hence the name of the element, but support has since
* been removed. You should use #glcolorconvert for that purpose.
*
* ## Examples
*
* ``` shell
* gst-launch-1.0 videotestsrc ! video/x-raw, width=640, height=480 ! glupload ! \
* glcolorscale ! glcolorconvert ! gldownload ! video/x-raw, width=320, height=240 ! \
* autovideosink
* ```
*
* A pipeline to test hardware scaling and colorspace conversion.
* FBO and GLSL are required.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstglelements.h"
#include "gstglcolorscale.h"
#define GST_CAT_DEFAULT gst_gl_colorscale_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
/* Properties */
enum
{
PROP_0
};
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_colorscale_debug, "glcolorscale", 0, "glcolorscale element");
#define gst_gl_colorscale_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLColorscale, gst_gl_colorscale,
GST_TYPE_GL_FILTER, DEBUG_INIT);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (glcolorscale, "glcolorscale",
GST_RANK_NONE, GST_TYPE_GL_COLORSCALE, gl_element_init (plugin));
static void gst_gl_colorscale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_colorscale_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_gl_colorscale_gl_start (GstGLBaseFilter * base_filter);
static void gst_gl_colorscale_gl_stop (GstGLBaseFilter * base_filter);
static gboolean gst_gl_colorscale_filter_texture (GstGLFilter * filter,
GstGLMemory * in_tex, GstGLMemory * out_tex);
static void
gst_gl_colorscale_class_init (GstGLColorscaleClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstBaseTransformClass *basetransform_class;
GstGLBaseFilterClass *base_filter_class;
GstGLFilterClass *filter_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
basetransform_class = GST_BASE_TRANSFORM_CLASS (klass);
base_filter_class = GST_GL_BASE_FILTER_CLASS (klass);
filter_class = GST_GL_FILTER_CLASS (klass);
gst_gl_filter_add_rgba_pad_templates (GST_GL_FILTER_CLASS (klass));
gobject_class->set_property = gst_gl_colorscale_set_property;
gobject_class->get_property = gst_gl_colorscale_get_property;
gst_element_class_set_metadata (element_class, "OpenGL color scale",
"Filter/Effect/Video", "Colorspace converter and video scaler",
"Julien Isorce <julien.isorce@gmail.com>\n"
"Matthew Waters <matthew@centricular.com>");
basetransform_class->passthrough_on_same_caps = TRUE;
base_filter_class->gl_start = GST_DEBUG_FUNCPTR (gst_gl_colorscale_gl_start);
base_filter_class->gl_stop = GST_DEBUG_FUNCPTR (gst_gl_colorscale_gl_stop);
base_filter_class->supported_gl_api =
GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2;
filter_class->filter_texture = gst_gl_colorscale_filter_texture;
}
static void
gst_gl_colorscale_init (GstGLColorscale * colorscale)
{
}
static void
gst_gl_colorscale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_colorscale_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_colorscale_gl_start (GstGLBaseFilter * base_filter)
{
GstGLColorscale *colorscale = GST_GL_COLORSCALE (base_filter);
GstGLFilter *filter = GST_GL_FILTER (base_filter);
GstGLShader *shader;
GError *error = NULL;
if (!(shader = gst_gl_shader_new_default (base_filter->context, &error))) {
GST_ERROR_OBJECT (colorscale, "Failed to initialize shader: %s",
error->message);
gst_object_unref (shader);
return FALSE;
}
filter->draw_attr_position_loc =
gst_gl_shader_get_attribute_location (shader, "a_position");
filter->draw_attr_texture_loc =
gst_gl_shader_get_attribute_location (shader, "a_texcoord");
colorscale->shader = shader;
return GST_GL_BASE_FILTER_CLASS (parent_class)->gl_start (base_filter);
}
static void
gst_gl_colorscale_gl_stop (GstGLBaseFilter * base_filter)
{
GstGLColorscale *colorscale = GST_GL_COLORSCALE (base_filter);
if (colorscale->shader) {
gst_object_unref (colorscale->shader);
colorscale->shader = NULL;
}
GST_GL_BASE_FILTER_CLASS (parent_class)->gl_stop (base_filter);
}
static gboolean
gst_gl_colorscale_filter_texture (GstGLFilter * filter, GstGLMemory * in_tex,
GstGLMemory * out_tex)
{
GstGLColorscale *colorscale = GST_GL_COLORSCALE (filter);
if (gst_gl_context_get_gl_api (GST_GL_BASE_FILTER (filter)->context))
gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex,
colorscale->shader);
return TRUE;
}