gstreamer/ext/gl/gstgldeinterlace.c

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/*
* GStreamer
* Copyright (C) 2009 Julien Isorce <julien.isorce@mail.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-deinterlace
*
* Deinterlacing using based on fragment shaders.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch videotestsrc ! glupload ! gldeinterlace ! glimagesink
* ]|
* FBO (Frame Buffer Object) and GLSL (OpenGL Shading Language) are required.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstgldeinterlace.h"
#define GST_CAT_DEFAULT gst_gl_deinterlace_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
enum
{
PROP_0
};
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_deinterlace_debug, "gldeinterlace", 0, "gldeinterlace element");
#define gst_gl_deinterlace_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstGLDeinterlace, gst_gl_deinterlace,
GST_TYPE_GL_FILTER, DEBUG_INIT);
static void gst_gl_deinterlace_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_gl_deinterlace_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean gst_gl_deinterlace_reset (GstBaseTransform * trans);
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static gboolean gst_gl_deinterlace_init_shader (GstGLFilter * filter);
static gboolean gst_gl_deinterlace_filter (GstGLFilter * filter,
GstBuffer * inbuf, GstBuffer * outbuf);
static gboolean gst_gl_deinterlace_filter_texture (GstGLFilter * filter,
guint in_tex, guint out_tex);
static void gst_gl_deinterlace_callback (gint width, gint height,
guint texture, gpointer stuff);
/* *INDENT-OFF* */
static const gchar *greedyh_fragment_source =
"uniform sampler2D tex;\n"
"uniform sampler2D tex_prev;\n"
"uniform float max_comb;\n"
"uniform float motion_threshold;\n"
"uniform float motion_sense;\n"
"uniform float width;\n"
"uniform float height;\n"
"void main () {\n"
" vec2 texcoord = gl_TexCoord[0].xy;\n"
" if (int(mod(texcoord.y * height, 2.0)) == 0) {\n"
" gl_FragColor = vec4(texture2D(tex_prev, texcoord).rgb, 1.0);\n"
" } else {\n"
" vec2 texcoord_L1_a1, texcoord_L3_a1, texcoord_L1, texcoord_L3, texcoord_L1_1, texcoord_L3_1;\n"
" vec3 L1_a1, L3_a1, L1, L3, L1_1, L3_1;\n"
" texcoord_L1 = vec2(texcoord.x, texcoord.y - 1.0 / height);\n"
" texcoord_L3 = vec2(texcoord.x, texcoord.y + 1.0 / height);\n"
" L1 = texture2D(tex_prev, texcoord_L1).rgb;\n"
" L3 = texture2D(tex_prev, texcoord_L3).rgb;\n"
" if (texcoord.x == 1.0 && texcoord.y == 1.0) {\n"
" L1_1 = L1;\n"
" L3_1 = L3;\n"
" } else {\n"
" texcoord_L1_1 = vec2(texcoord.x + 1.0 / width, texcoord.y - 1.0 / height);\n"
" texcoord_L3_1 = vec2(texcoord.x + 1.0 / width, texcoord.y + 1.0 / height);\n"
" L1_1 = texture2D(tex_prev, texcoord_L1_1).rgb;\n"
" L3_1 = texture2D(tex_prev, texcoord_L3_1).rgb;\n"
" }\n"
" if (int(ceil(texcoord.x + texcoord.y)) == 0) {\n"
" L1_a1 = L1;\n"
" L3_a1 = L3;\n"
" } else {\n"
" texcoord_L1_a1 = vec2(texcoord.x - 1.0 / width, texcoord.y - 1.0 / height);\n"
" texcoord_L3_a1 = vec2(texcoord.x - 1.0 / width, texcoord.y + 1.0 / height);\n"
" L1_a1 = texture2D(tex_prev, texcoord_L1_a1).rgb;\n"
" L3_a1 = texture2D(tex_prev, texcoord_L3_a1).rgb;\n"
" }\n"
//STEP 1
" vec3 avg_a1 = (L1_a1 + L3_a1) / 2.0;\n"
" vec3 avg = (L1 + L3) / 2.0;\n"
" vec3 avg_1 = (L1_1 + L3_1) / 2.0;\n"
" vec3 avg_s = (avg_a1 + avg_1) / 2.0;\n"
" vec3 avg_sc = (avg_s + avg) / 2.0;\n"
" vec3 L2 = texture2D(tex, texcoord).rgb;\n"
" vec3 LP2 = texture2D(tex_prev, texcoord).rgb;\n"
" vec3 best;\n"
" if (abs(L2.r - avg_sc.r) < abs(LP2.r - avg_sc.r)) {\n"
" best.r = L2.r;\n" " } else {\n"
" best.r = LP2.r;\n"
" }\n"
" if (abs(L2.g - avg_sc.g) < abs(LP2.g - avg_sc.g)) {\n"
" best.g = L2.g;\n"
" } else {\n"
" best.g = LP2.g;\n"
" }\n"
" if (abs(L2.b - avg_sc.b) < abs(LP2.b - avg_sc.b)) {\n"
" best.b = L2.b;\n"
" } else {\n"
" best.b = LP2.b;\n"
" }\n"
//STEP 2
" vec3 last;\n"
" last.r = clamp(best.r, max(min(L1.r, L3.r) - max_comb, 0.0), min(max(L1.r, L3.r) + max_comb, 1.0));\n"
" last.g = clamp(best.g, max(min(L1.g, L3.g) - max_comb, 0.0), min(max(L1.g, L3.g) + max_comb, 1.0));\n"
" last.b = clamp(best.b, max(min(L1.b, L3.b) - max_comb, 0.0), min(max(L1.b, L3.b) + max_comb, 1.0));\n"
//STEP 3
" const vec3 luma = vec3 (0.299011, 0.586987, 0.114001);"
" float mov = min(max(abs(dot(L2 - LP2, luma)) - motion_threshold, 0.0) * motion_sense, 1.0);\n"
" last = last * (1.0 - mov) + avg_sc * mov;\n"
" gl_FragColor = vec4(last, 1.0);\n"
" }\n"
"}\n";
/* *INDENT-ON* */
static void
gst_gl_deinterlace_class_init (GstGLDeinterlaceClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_gl_deinterlace_set_property;
gobject_class->get_property = gst_gl_deinterlace_get_property;
gst_element_class_set_metadata (element_class,
"OpenGL deinterlacing filter", "Deinterlace",
"Deinterlacing based on fragment shaders",
"Julien Isorce <julien.isorce@mail.com>");
GST_BASE_TRANSFORM_CLASS (klass)->stop = gst_gl_deinterlace_reset;
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GST_GL_FILTER_CLASS (klass)->filter = gst_gl_deinterlace_filter;
GST_GL_FILTER_CLASS (klass)->filter_texture =
gst_gl_deinterlace_filter_texture;
GST_GL_FILTER_CLASS (klass)->init_fbo = gst_gl_deinterlace_init_shader;
GST_GL_BASE_FILTER_CLASS (klass)->supported_gl_api = GST_GL_API_OPENGL;
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}
static void
gst_gl_deinterlace_init (GstGLDeinterlace * filter)
{
filter->shader = NULL;
filter->prev_buffer = NULL;
filter->prev_tex = 0;
}
static gboolean
gst_gl_deinterlace_reset (GstBaseTransform * trans)
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{
GstGLDeinterlace *deinterlace_filter = GST_GL_DEINTERLACE (trans);
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gst_buffer_replace (&deinterlace_filter->prev_buffer, NULL);
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//blocking call, wait the opengl thread has destroyed the shader
if (deinterlace_filter->shader)
gst_gl_context_del_shader (GST_GL_BASE_FILTER (trans)->context,
deinterlace_filter->shader);
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deinterlace_filter->shader = NULL;
return GST_BASE_TRANSFORM_CLASS (parent_class)->stop (trans);
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}
static void
gst_gl_deinterlace_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
//GstGLDeinterlace *filter = GST_GL_DEINTERLACE (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_deinterlace_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
//GstGLDeinterlace *filter = GST_GL_DEINTERLACE (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_deinterlace_init_shader (GstGLFilter * filter)
{
GstGLDeinterlace *deinterlace_filter = GST_GL_DEINTERLACE (filter);
//blocking call, wait the opengl thread has compiled the shader
return gst_gl_context_gen_shader (GST_GL_BASE_FILTER (filter)->context, 0,
greedyh_fragment_source, &deinterlace_filter->shader);
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}
static gboolean
gst_gl_deinterlace_filter_texture (GstGLFilter * filter, guint in_tex,
guint out_tex)
{
GstGLDeinterlace *deinterlace_filter = GST_GL_DEINTERLACE (filter);
//blocking call, use a FBO
gst_gl_filter_render_to_target (filter, TRUE, in_tex, out_tex,
gst_gl_deinterlace_callback, deinterlace_filter);
return TRUE;
}
static gboolean
gst_gl_deinterlace_filter (GstGLFilter * filter, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstGLDeinterlace *deinterlace_filter = GST_GL_DEINTERLACE (filter);
gst_gl_filter_filter_texture (filter, inbuf, outbuf);
gst_buffer_replace (&deinterlace_filter->prev_buffer, inbuf);
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return TRUE;
}
//opengl scene, params: input texture (not the output filter->texture)
static void
gst_gl_deinterlace_callback (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLDeinterlace *deinterlace_filter = GST_GL_DEINTERLACE (stuff);
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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guint temp;
GLfloat verts[] = { -1.0, -1.0,
1.0, -1.0,
1.0, 1.0,
-1.0, 1.0
};
GLfloat texcoords0[] = { 0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f
};
GLfloat texcoords1[] = { 0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f
};
gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
gst_gl_shader_use (deinterlace_filter->shader);
if (G_UNLIKELY (deinterlace_filter->prev_tex == 0)) {
gst_gl_context_gen_texture (GST_GL_BASE_FILTER (filter)->context,
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&deinterlace_filter->prev_tex,
GST_VIDEO_INFO_FORMAT (&filter->out_info),
GST_VIDEO_INFO_WIDTH (&filter->out_info),
GST_VIDEO_INFO_HEIGHT (&filter->out_info));
} else {
gl->ActiveTexture (GL_TEXTURE1);
gst_gl_shader_set_uniform_1i (deinterlace_filter->shader, "tex_prev", 1);
gl->BindTexture (GL_TEXTURE_2D, deinterlace_filter->prev_tex);
}
gl->ActiveTexture (GL_TEXTURE0);
gst_gl_shader_set_uniform_1i (deinterlace_filter->shader, "tex", 0);
gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "max_comb",
5.0f / 255.0f);
gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "motion_threshold",
25.0f / 255.0f);
gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "motion_sense",
30.0f / 255.0f);
gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "width",
GST_VIDEO_INFO_WIDTH (&filter->out_info));
gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "height",
GST_VIDEO_INFO_HEIGHT (&filter->out_info));
gl->ClientActiveTexture (GL_TEXTURE0);
gl->EnableClientState (GL_TEXTURE_COORD_ARRAY);
gl->EnableClientState (GL_VERTEX_ARRAY);
gl->VertexPointer (2, GL_FLOAT, 0, &verts);
gl->TexCoordPointer (2, GL_FLOAT, 0, &texcoords0);
gl->ClientActiveTexture (GL_TEXTURE1);
gl->EnableClientState (GL_TEXTURE_COORD_ARRAY);
gl->TexCoordPointer (2, GL_FLOAT, 0, &texcoords1);
gl->DrawArrays (GL_TRIANGLE_FAN, 0, 4);
gl->DisableClientState (GL_VERTEX_ARRAY);
gl->DisableClientState (GL_TEXTURE_COORD_ARRAY);
gl->ClientActiveTexture (GL_TEXTURE0);
gl->DisableClientState (GL_TEXTURE_COORD_ARRAY);
if (texture == filter->in_tex_id) {
temp = filter->in_tex_id;
filter->in_tex_id = deinterlace_filter->prev_tex;
deinterlace_filter->prev_tex = temp;
} else {
deinterlace_filter->prev_tex = texture;
}
}