gstreamer/ext/gl/gstgldifferencematte.c

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/*
* GStreamer
* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@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-gldifferencematte.
*
* Saves a background frame and replace it with a pixbuf.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch videotestsrc ! glupload ! gldifferencemate location=backgroundimagefile ! glimagesink
* ]|
* FBO (Frame Buffer Object) and GLSL (OpenGL Shading Language) are required.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <png.h>
#include "gstgldifferencematte.h"
#include "effects/gstgleffectssources.h"
#if PNG_LIBPNG_VER >= 10400
#define int_p_NULL NULL
#define png_infopp_NULL NULL
#endif
#define GST_CAT_DEFAULT gst_gl_differencematte_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_differencematte_debug, "gldifferencematte", 0, "gldifferencematte element");
G_DEFINE_TYPE_WITH_CODE (GstGLDifferenceMatte, gst_gl_differencematte,
GST_TYPE_GL_FILTER, DEBUG_INIT);
static void gst_gl_differencematte_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_gl_differencematte_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean gst_gl_differencematte_filter_texture (GstGLFilter * filter,
guint in_tex, guint out_tex);
static gboolean gst_gl_differencematte_loader (GstGLFilter * filter);
enum
{
PROP_0,
PROP_LOCATION,
};
/* init resources that need a gl context */
static void
gst_gl_differencematte_init_gl_resources (GstGLFilter * filter)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (filter);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gint i;
for (i = 0; i < 4; i++) {
gl->GenTextures (1, &differencematte->midtexture[i]);
gl->BindTexture (GL_TEXTURE_2D, differencematte->midtexture[i]);
gl->TexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8,
GST_VIDEO_INFO_WIDTH (&filter->out_info),
GST_VIDEO_INFO_HEIGHT (&filter->out_info),
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
differencematte->shader[i] =
gst_gl_shader_new (GST_GL_BASE_FILTER (filter)->context);
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}
if (!gst_gl_shader_compile_with_default_v_and_check (differencematte->shader
[0], difference_fragment_source, &filter->draw_attr_position_loc,
&filter->draw_attr_texture_loc)) {
gst_gl_context_set_error (GST_GL_BASE_FILTER (differencematte)->context,
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"Failed to initialize difference shader");
GST_ELEMENT_ERROR (differencematte, RESOURCE, NOT_FOUND, ("%s",
gst_gl_context_get_error ()), (NULL));
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return;
}
if (!gst_gl_shader_compile_with_default_v_and_check (differencematte->shader
[1], hconv7_fragment_source_gles2, &filter->draw_attr_position_loc,
&filter->draw_attr_texture_loc)) {
gst_gl_context_set_error (GST_GL_BASE_FILTER (differencematte)->context,
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"Failed to initialize hconv7 shader");
GST_ELEMENT_ERROR (differencematte, RESOURCE, NOT_FOUND, ("%s",
gst_gl_context_get_error ()), (NULL));
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return;
}
if (!gst_gl_shader_compile_with_default_v_and_check (differencematte->shader
[2], vconv7_fragment_source_gles2, &filter->draw_attr_position_loc,
&filter->draw_attr_texture_loc)) {
gst_gl_context_set_error (GST_GL_BASE_FILTER (differencematte)->context,
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"Failed to initialize vconv7 shader");
GST_ELEMENT_ERROR (differencematte, RESOURCE, NOT_FOUND, ("%s",
gst_gl_context_get_error ()), (NULL));
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return;
}
if (!gst_gl_shader_compile_with_default_v_and_check (differencematte->shader
[3], texture_interp_fragment_source, &filter->draw_attr_position_loc,
&filter->draw_attr_texture_loc)) {
gst_gl_context_set_error (GST_GL_BASE_FILTER (differencematte)->context,
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"Failed to initialize interp shader");
GST_ELEMENT_ERROR (differencematte, RESOURCE, NOT_FOUND, ("%s",
gst_gl_context_get_error ()), (NULL));
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return;
}
}
/* free resources that need a gl context */
static void
gst_gl_differencematte_reset_gl_resources (GstGLFilter * filter)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (filter);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gint i;
gl->DeleteTextures (1, &differencematte->savedbgtexture);
gl->DeleteTextures (1, &differencematte->newbgtexture);
for (i = 0; i < 4; i++) {
if (differencematte->shader[i]) {
gst_object_unref (differencematte->shader[i]);
differencematte->shader[i] = NULL;
}
if (differencematte->midtexture[i]) {
gl->DeleteTextures (1, &differencematte->midtexture[i]);
differencematte->midtexture[i] = 0;
}
}
differencematte->location = NULL;
differencematte->pixbuf = NULL;
differencematte->savedbgtexture = 0;
differencematte->newbgtexture = 0;
differencematte->bg_has_changed = FALSE;
}
static void
gst_gl_differencematte_class_init (GstGLDifferenceMatteClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_gl_differencematte_set_property;
gobject_class->get_property = gst_gl_differencematte_get_property;
GST_GL_FILTER_CLASS (klass)->filter_texture =
gst_gl_differencematte_filter_texture;
GST_GL_FILTER_CLASS (klass)->display_init_cb =
gst_gl_differencematte_init_gl_resources;
GST_GL_FILTER_CLASS (klass)->display_reset_cb =
gst_gl_differencematte_reset_gl_resources;
g_object_class_install_property (gobject_class,
PROP_LOCATION,
g_param_spec_string ("location",
"Background image location",
"Background image location", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class,
"Gstreamer OpenGL DifferenceMatte", "Filter/Effect/Video",
"Saves a background frame and replace it with a pixbuf",
"Filippo Argiolas <filippo.argiolas@gmail.com>");
GST_GL_BASE_FILTER_CLASS (klass)->supported_gl_api =
GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2;
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}
static void
gst_gl_differencematte_init (GstGLDifferenceMatte * differencematte)
{
differencematte->shader[0] = NULL;
differencematte->shader[1] = NULL;
differencematte->shader[2] = NULL;
differencematte->shader[3] = NULL;
differencematte->location = NULL;
differencematte->pixbuf = NULL;
differencematte->savedbgtexture = 0;
differencematte->newbgtexture = 0;
differencematte->bg_has_changed = FALSE;
fill_gaussian_kernel (differencematte->kernel, 7, 30.0);
}
static void
gst_gl_differencematte_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (object);
switch (prop_id) {
case PROP_LOCATION:
if (differencematte->location != NULL)
g_free (differencematte->location);
differencematte->bg_has_changed = TRUE;
differencematte->location = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_differencematte_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (object);
switch (prop_id) {
case PROP_LOCATION:
g_value_set_string (value, differencematte->location);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_differencematte_save_texture (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
gst_gl_filter_draw_texture (filter, texture, width, height);
}
static void
init_pixbuf_texture (GstGLContext * context, gpointer data)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (data);
GstGLFilter *filter = GST_GL_FILTER (data);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gl->DeleteTextures (1, &differencematte->newbgtexture);
gl->GenTextures (1, &differencematte->newbgtexture);
gl->BindTexture (GL_TEXTURE_2D, differencematte->newbgtexture);
gl->TexImage2D (GL_TEXTURE_2D, 0, GL_RGBA,
(gint) differencematte->pbuf_width, (gint) differencematte->pbuf_height,
0, GL_RGBA, GL_UNSIGNED_BYTE, differencematte->pixbuf);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
if (differencematte->savedbgtexture == 0) {
gl->GenTextures (1, &differencematte->savedbgtexture);
gl->BindTexture (GL_TEXTURE_2D, differencematte->savedbgtexture);
gl->TexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8,
GST_VIDEO_INFO_WIDTH (&filter->out_info),
GST_VIDEO_INFO_HEIGHT (&filter->out_info),
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
}
static void
gst_gl_differencematte_diff (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (stuff);
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
gst_gl_shader_use (differencematte->shader[0]);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, texture);
gst_gl_shader_set_uniform_1i (differencematte->shader[0], "current", 0);
gl->ActiveTexture (GL_TEXTURE1);
gl->BindTexture (GL_TEXTURE_2D, differencematte->savedbgtexture);
gst_gl_shader_set_uniform_1i (differencematte->shader[0], "saved", 1);
gst_gl_filter_draw_texture (filter, texture, width, height);
}
static void
gst_gl_differencematte_hblur (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (stuff);
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
gst_gl_shader_use (differencematte->shader[1]);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, texture);
gst_gl_shader_set_uniform_1i (differencematte->shader[1], "tex", 0);
gst_gl_shader_set_uniform_1fv (differencematte->shader[1], "kernel", 7,
differencematte->kernel);
gst_gl_shader_set_uniform_1f (differencematte->shader[1], "width", width);
gst_gl_filter_draw_texture (filter, texture, width, height);
}
static void
gst_gl_differencematte_vblur (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (stuff);
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
gst_gl_shader_use (differencematte->shader[2]);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, texture);
gst_gl_shader_set_uniform_1i (differencematte->shader[2], "tex", 0);
gst_gl_shader_set_uniform_1fv (differencematte->shader[2], "kernel", 7,
differencematte->kernel);
gst_gl_shader_set_uniform_1f (differencematte->shader[2], "height", height);
gst_gl_filter_draw_texture (filter, texture, width, height);
}
static void
gst_gl_differencematte_interp (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (stuff);
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
glLoadIdentity ();
gst_gl_shader_use (differencematte->shader[3]);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, texture);
gst_gl_shader_set_uniform_1i (differencematte->shader[3], "blend", 0);
gl->ActiveTexture (GL_TEXTURE1);
gl->BindTexture (GL_TEXTURE_2D, differencematte->newbgtexture);
gst_gl_shader_set_uniform_1i (differencematte->shader[3], "base", 1);
gl->ActiveTexture (GL_TEXTURE2);
gl->BindTexture (GL_TEXTURE_2D, differencematte->midtexture[2]);
gst_gl_shader_set_uniform_1i (differencematte->shader[3], "alpha", 2);
gst_gl_filter_draw_texture (filter, texture, width, height);
}
static void
gst_gl_differencematte_identity (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (stuff);
GstGLFilter *filter = GST_GL_FILTER (differencematte);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
gst_gl_filter_draw_texture (filter, texture, width, height);
}
static gboolean
gst_gl_differencematte_filter_texture (GstGLFilter * filter, guint in_tex,
guint out_tex)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (filter);
differencematte->intexture = in_tex;
if (differencematte->bg_has_changed && (differencematte->location != NULL)) {
if (!gst_gl_differencematte_loader (filter))
differencematte->pixbuf = NULL;
/* if loader failed then context is turned off */
gst_gl_context_thread_add (GST_GL_BASE_FILTER (filter)->context,
init_pixbuf_texture, differencematte);
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/* save current frame, needed to calculate difference between
* this frame and next ones */
gst_gl_filter_render_to_target (filter, TRUE, in_tex,
differencematte->savedbgtexture,
gst_gl_differencematte_save_texture, differencematte);
if (differencematte->pixbuf) {
free (differencematte->pixbuf);
differencematte->pixbuf = NULL;
}
differencematte->bg_has_changed = FALSE;
}
if (differencematte->savedbgtexture != 0) {
gst_gl_filter_render_to_target (filter, TRUE, in_tex,
differencematte->midtexture[0], gst_gl_differencematte_diff,
differencematte);
gst_gl_filter_render_to_target (filter, FALSE,
differencematte->midtexture[0], differencematte->midtexture[1],
gst_gl_differencematte_hblur, differencematte);
gst_gl_filter_render_to_target (filter, FALSE,
differencematte->midtexture[1], differencematte->midtexture[2],
gst_gl_differencematte_vblur, differencematte);
gst_gl_filter_render_to_target (filter, TRUE, in_tex, out_tex,
gst_gl_differencematte_interp, differencematte);
} else {
gst_gl_filter_render_to_target (filter, TRUE, in_tex, out_tex,
gst_gl_differencematte_identity, differencematte);
}
return TRUE;
}
static void
user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
{
g_warning ("%s\n", warning_msg);
}
#define LOAD_ERROR(msg) { GST_WARNING ("unable to load %s: %s", differencematte->location, msg); return FALSE; }
static gboolean
gst_gl_differencematte_loader (GstGLFilter * filter)
{
GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (filter);
png_structp png_ptr;
png_infop info_ptr;
guint sig_read = 0;
png_uint_32 width = 0;
png_uint_32 height = 0;
gint bit_depth = 0;
gint color_type = 0;
gint interlace_type = 0;
png_FILE_p fp = NULL;
guint y = 0;
guchar **rows = NULL;
gint filler;
if (!GST_GL_BASE_FILTER (filter)->context)
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return TRUE;
if ((fp = fopen (differencematte->location, "rb")) == NULL)
LOAD_ERROR ("file not found");
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
fclose (fp);
LOAD_ERROR ("failed to initialize the png_struct");
}
png_set_error_fn (png_ptr, NULL, NULL, user_warning_fn);
info_ptr = png_create_info_struct (png_ptr);
if (info_ptr == NULL) {
fclose (fp);
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
LOAD_ERROR ("failed to initialize the memory for image information");
}
png_init_io (png_ptr, fp);
png_set_sig_bytes (png_ptr, sig_read);
png_read_info (png_ptr, info_ptr);
png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
&interlace_type, int_p_NULL, int_p_NULL);
if (color_type == PNG_COLOR_TYPE_RGB) {
filler = 0xff;
png_set_filler (png_ptr, filler, PNG_FILLER_AFTER);
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
}
if (color_type != PNG_COLOR_TYPE_RGB_ALPHA) {
fclose (fp);
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
LOAD_ERROR ("color type is not rgb");
}
differencematte->pbuf_width = width;
differencematte->pbuf_height = height;
differencematte->pixbuf =
(guchar *) malloc (sizeof (guchar) * width * height * 4);
rows = (guchar **) malloc (sizeof (guchar *) * height);
for (y = 0; y < height; ++y)
rows[y] = (guchar *) (differencematte->pixbuf + y * width * 4);
png_read_image (png_ptr, rows);
free (rows);
png_read_end (png_ptr, info_ptr);
png_destroy_read_struct (&png_ptr, &info_ptr, png_infopp_NULL);
fclose (fp);
return TRUE;
}