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gstreamer/ext/gl/gstglvideomixer.c
Matthew Waters 4bbda2b626 glframebuffer: rewrite for a more consistent API 
Facilities are given to create fbo's and attach GL memory (renderbuffers
or textures).  It also keeps track of the renderable size for use with
effective use with glViewport().
2017-12-09 19:32:21 +00:00

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/*
* GStreamer
* Copyright (C) 2009 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-glvideomixer
*
* Composites a number of streams into a single output scene using OpenGL in
* a similar fashion to compositor and videomixer. See the compositor plugin
* for documentation about the #GstGLVideoMixerPad properties.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch-1.0 glvideomixer name=m ! glimagesink \
* videotestsrc ! video/x-raw, format=YUY2 ! m. \
* videotestsrc pattern=12 ! video/x-raw, format=I420, framerate=5/1, width=100, height=200 ! queue ! m. \
* videotestsrc ! video/x-raw, format=RGB, framerate=15/1, width=1500, height=1500 ! gleffects effect=3 ! queue ! m. \
* videotestsrc ! gleffects effect=2 ! queue ! m. \
* videotestsrc ! glfiltercube ! queue ! m. \
* videotestsrc ! gleffects effect=6 ! queue ! m.
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/video/gstvideoaffinetransformationmeta.h>
#include "gstglvideomixer.h"
#include "gstglmixerbin.h"
#define GST_CAT_DEFAULT gst_gl_video_mixer_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define GST_GL_TYPE_VIDEO_MIXER_BACKGROUND (gst_gl_video_mixer_background_get_type())
static GType
gst_gl_video_mixer_background_get_type (void)
{
static GType mixer_background_type = 0;
static const GEnumValue mixer_background[] = {
{GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER, "Checker pattern", "checker"},
{GST_GL_VIDEO_MIXER_BACKGROUND_BLACK, "Black", "black"},
{GST_GL_VIDEO_MIXER_BACKGROUND_WHITE, "White", "white"},
{GST_GL_VIDEO_MIXER_BACKGROUND_TRANSPARENT,
"Transparent Background to enable further compositing", "transparent"},
{0, NULL, NULL},
};
if (!mixer_background_type) {
mixer_background_type =
g_enum_register_static ("GstGLVideoMixerBackground", mixer_background);
}
return mixer_background_type;
}
#define GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION (gst_gl_video_mixer_blend_equation_get_type())
static GType
gst_gl_video_mixer_blend_equation_get_type (void)
{
static GType mixer_blend_equation_type = 0;
static const GEnumValue mixer_blend_equations[] = {
{GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD, "Add", "add"},
{GST_GL_VIDEO_MIXER_BLEND_EQUATION_SUBTRACT, "Subtract", "subtract"},
{GST_GL_VIDEO_MIXER_BLEND_EQUATION_REVERSE_SUBTRACT, "Reverse Subtract",
"reverse-subtract"},
{0, NULL, NULL},
};
if (!mixer_blend_equation_type) {
mixer_blend_equation_type =
g_enum_register_static ("GstGLVideoMixerBlendEquation",
mixer_blend_equations);
}
return mixer_blend_equation_type;
}
#define GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION (gst_gl_video_mixer_blend_function_get_type())
static GType
gst_gl_video_mixer_blend_function_get_type (void)
{
static GType mixer_blend_function_type = 0;
static const GEnumValue mixer_blend_funcs[] = {
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ZERO, "Zero", "zero"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE, "One", "one"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_COLOR, "Source Color", "src-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_COLOR,
"One Minus Source Color", "one-minus-src-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_COLOR, "Destination Color",
"dst-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_COLOR,
"One Minus Destination Color", "one-minus-dst-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA, "Source Alpha", "src-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA,
"One Minus Source Alpha", "one-minus-src-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_ALPHA, "Destination Alpha",
"dst-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_ALPHA,
"One Minus Destination Alpha", "one-minus-dst-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_COLOR, "Constant Color",
"constant-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR,
"One Minus Constant Color", "one-minus-contant-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_ALPHA, "Constant Alpha",
"constant-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR,
"One Minus Constant Alpha", "one-minus-contant-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE,
"Source Alpha Saturate", "src-alpha-saturate"},
{0, NULL, NULL},
};
if (!mixer_blend_function_type) {
mixer_blend_function_type =
g_enum_register_static ("GstGLVideoMixerBlendFunction",
mixer_blend_funcs);
}
return mixer_blend_function_type;
}
#define DEFAULT_PAD_XPOS 0
#define DEFAULT_PAD_YPOS 0
#define DEFAULT_PAD_WIDTH 0
#define DEFAULT_PAD_HEIGHT 0
#define DEFAULT_PAD_ALPHA 1.0
#define DEFAULT_PAD_ZORDER 0
#define DEFAULT_PAD_IGNORE_EOS FALSE
#define DEFAULT_PAD_BLEND_EQUATION_RGB GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD
#define DEFAULT_PAD_BLEND_EQUATION_ALPHA GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD
#define DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA
#define DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA
#define DEFAULT_PAD_BLEND_FUNCTION_DST_RGB GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA
#define DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA
enum
{
PROP_INPUT_0,
PROP_INPUT_XPOS,
PROP_INPUT_YPOS,
PROP_INPUT_WIDTH,
PROP_INPUT_HEIGHT,
PROP_INPUT_ALPHA,
PROP_INPUT_BLEND_EQUATION_RGB,
PROP_INPUT_BLEND_EQUATION_ALPHA,
PROP_INPUT_BLEND_FUNCTION_SRC_RGB,
PROP_INPUT_BLEND_FUNCTION_SRC_ALPHA,
PROP_INPUT_BLEND_FUNCTION_DST_RGB,
PROP_INPUT_BLEND_FUNCTION_DST_ALPHA,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_RED,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
PROP_INPUT_ZORDER,
PROP_INPUT_IGNORE_EOS,
};
static void gst_gl_video_mixer_input_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_input_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
typedef struct _GstGLVideoMixerInput GstGLVideoMixerInput;
typedef GstGhostPadClass GstGLVideoMixerInputClass;
struct _GstGLVideoMixerInput
{
GstGhostPad parent;
GstSegment segment;
GstPad *mixer_pad;
};
GType gst_gl_video_mixer_input_get_type (void);
G_DEFINE_TYPE (GstGLVideoMixerInput, gst_gl_video_mixer_input,
GST_TYPE_GHOST_PAD);
static void
gst_gl_video_mixer_input_init (GstGLVideoMixerInput * self)
{
}
static void
gst_gl_video_mixer_input_class_init (GstGLVideoMixerInputClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_gl_video_mixer_input_set_property;
gobject_class->get_property = gst_gl_video_mixer_input_get_property;
g_object_class_install_property (gobject_class, PROP_INPUT_ZORDER,
g_param_spec_uint ("zorder", "Z-Order", "Z Order of the picture",
0, 10000, DEFAULT_PAD_ZORDER,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_IGNORE_EOS,
g_param_spec_boolean ("ignore-eos", "Ignore EOS", "Aggregate the last "
"frame on pads that are EOS till they are released",
DEFAULT_PAD_IGNORE_EOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_WIDTH,
g_param_spec_int ("width", "Width", "Width of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_WIDTH,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_HEIGHT,
g_param_spec_int ("height", "Height", "Height of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_HEIGHT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_BLEND_EQUATION_RGB,
g_param_spec_enum ("blend-equation-rgb", "Blend Equation RGB",
"Blend Equation for RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_EQUATION_ALPHA,
g_param_spec_enum ("blend-equation-alpha", "Blend Equation Alpha",
"Blend Equation for Alpha", GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_RGB,
g_param_spec_enum ("blend-function-src-rgb", "Blend Function Source RGB",
"Blend Function for Source RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_ALPHA,
g_param_spec_enum ("blend-function-src-alpha",
"Blend Function Source Alpha", "Blend Function for Source Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_RGB,
g_param_spec_enum ("blend-function-dst-rgb",
"Blend Function Destination RGB",
"Blend Function for Destination RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_ALPHA,
g_param_spec_enum ("blend-function-dst-alpha",
"Blend Function Destination Alpha",
"Blend Function for Destiniation Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_RED,
g_param_spec_double ("blend-constant-color-red",
"Blend Constant Color Red", "Blend Constant Color Red", 0.0, 1.0, 0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
g_param_spec_double ("blend-constant-color-green",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
g_param_spec_double ("blend-constant-color-blue",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
g_param_spec_double ("blend-constant-color-alpha",
"Blend Constant Color Alpha", "Blend Constant Color Alpha", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
gst_gl_video_mixer_input_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerInput *self = (GstGLVideoMixerInput *) object;
if (self->mixer_pad)
g_object_get_property (G_OBJECT (self->mixer_pad), pspec->name, value);
}
static void
gst_gl_video_mixer_input_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerInput *self = (GstGLVideoMixerInput *) object;
if (self->mixer_pad)
g_object_set_property (G_OBJECT (self->mixer_pad), pspec->name, value);
}
static GstGhostPad *
_create_video_mixer_input (GstGLMixerBin * self, GstPad * mixer_pad)
{
GstGLVideoMixerInput *input =
g_object_new (gst_gl_video_mixer_input_get_type (), "name",
GST_OBJECT_NAME (mixer_pad), "direction", GST_PAD_DIRECTION (mixer_pad),
NULL);
if (!gst_ghost_pad_construct (GST_GHOST_PAD (input))) {
gst_object_unref (input);
return NULL;
}
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "zorder");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "xpos");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "ypos");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "width");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "height");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "alpha");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-equation-rgb");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-equation-alpha");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-function-src-rgb");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-function-src-alpha");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-function-dst-rgb");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-function-dst-alpha");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-constant-color-red");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-constant-color-green");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-constant-color-blue");
gst_gl_object_add_control_binding_proxy (GST_OBJECT (mixer_pad),
GST_OBJECT (input), "blend-constant-color-alpha");
input->mixer_pad = mixer_pad;
return GST_GHOST_PAD (input);
}
enum
{
PROP_BIN_0,
PROP_BIN_BACKGROUND,
};
#define DEFAULT_BACKGROUND GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER
static void gst_gl_video_mixer_bin_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_bin_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
typedef GstGLMixerBin GstGLVideoMixerBin;
typedef GstGLMixerBinClass GstGLVideoMixerBinClass;
G_DEFINE_TYPE (GstGLVideoMixerBin, gst_gl_video_mixer_bin,
GST_TYPE_GL_MIXER_BIN);
static void
gst_gl_video_mixer_bin_init (GstGLVideoMixerBin * self)
{
GstGLMixerBin *mix_bin = GST_GL_MIXER_BIN (self);
gst_gl_mixer_bin_finish_init_with_element (mix_bin,
g_object_new (GST_TYPE_GL_VIDEO_MIXER, NULL));
}
static void
gst_gl_video_mixer_bin_class_init (GstGLVideoMixerBinClass * klass)
{
GstGLMixerBinClass *mixer_class = GST_GL_MIXER_BIN_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
mixer_class->create_input_pad = _create_video_mixer_input;
gobject_class->set_property = gst_gl_video_mixer_bin_set_property;
gobject_class->get_property = gst_gl_video_mixer_bin_get_property;
g_object_class_install_property (gobject_class, PROP_BIN_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_GL_TYPE_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class, "OpenGL video_mixer bin",
"Bin/Filter/Effect/Video/Compositor", "OpenGL video_mixer bin",
"Matthew Waters <matthew@centricular.com>");
}
static void
gst_gl_video_mixer_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLMixerBin *self = GST_GL_MIXER_BIN (object);
if (self->mixer)
g_object_get_property (G_OBJECT (self->mixer), pspec->name, value);
}
static void
gst_gl_video_mixer_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLMixerBin *self = GST_GL_MIXER_BIN (object);
if (self->mixer)
g_object_set_property (G_OBJECT (self->mixer), pspec->name, value);
}
enum
{
PROP_0,
PROP_BACKGROUND,
};
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_video_mixer_debug, "glvideomixer", 0, "glvideomixer element");
#define gst_gl_video_mixer_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLVideoMixer, gst_gl_video_mixer, GST_TYPE_GL_MIXER,
DEBUG_INIT);
static void gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *_update_caps (GstVideoAggregator * vagg, GstCaps * caps,
GstCaps * filter);
static GstCaps *_fixate_caps (GstVideoAggregator * vagg, GstCaps * caps);
static gboolean gst_gl_video_mixer_propose_allocation (GstGLBaseMixer *
base_mix, GstGLBaseMixerPad * base_pad, GstQuery * decide_query,
GstQuery * query);
static void gst_gl_video_mixer_reset (GstGLMixer * mixer);
static gboolean gst_gl_video_mixer_init_shader (GstGLMixer * mixer,
GstCaps * outcaps);
static gboolean gst_gl_video_mixer_process_textures (GstGLMixer * mixer,
GstGLMemory * out_tex);
static gboolean gst_gl_video_mixer_callback (gpointer stuff);
/* *INDENT-OFF* */
/* fragment source */
static const gchar *video_mixer_f_src =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform sampler2D texture; \n"
"uniform float alpha;\n"
"varying vec2 v_texcoord; \n"
"void main() \n"
"{ \n"
" vec4 rgba = texture2D(texture, v_texcoord);\n"
" gl_FragColor = vec4(rgba.rgb, rgba.a * alpha);\n"
"} \n";
/* checker vertex source */
static const gchar *checker_v_src =
"attribute vec4 a_position;\n"
"void main()\n"
"{\n"
" gl_Position = a_position;\n"
"}\n";
/* checker fragment source */
static const gchar *checker_f_src =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"const float blocksize = 8.0;\n"
"void main ()\n"
"{\n"
" vec4 high = vec4(0.667, 0.667, 0.667, 1.0);\n"
" vec4 low = vec4(0.333, 0.333, 0.333, 1.0);\n"
" if (mod(gl_FragCoord.x, blocksize * 2.0) >= blocksize) {\n"
" if (mod(gl_FragCoord.y, blocksize * 2.0) >= blocksize)\n"
" gl_FragColor = low;\n"
" else\n"
" gl_FragColor = high;\n"
" } else {\n"
" if (mod(gl_FragCoord.y, blocksize * 2.0) < blocksize)\n"
" gl_FragColor = low;\n"
" else\n"
" gl_FragColor = high;\n"
" }\n"
"}\n";
/* *INDENT-ON* */
#define GST_TYPE_GL_VIDEO_MIXER_PAD (gst_gl_video_mixer_pad_get_type())
#define GST_GL_VIDEO_MIXER_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_VIDEO_MIXER_PAD, GstGLVideoMixerPad))
#define GST_GL_VIDEO_MIXER_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_VIDEO_MIXER_PAD, GstGLVideoMixerPadClass))
#define GST_IS_GL_VIDEO_MIXER_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_VIDEO_MIXER_PAD))
#define GST_IS_GL_VIDEO_MIXER_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_VIDEO_MIXER_PAD))
typedef struct _GstGLVideoMixerPad GstGLVideoMixerPad;
typedef struct _GstGLVideoMixerPadClass GstGLVideoMixerPadClass;
typedef struct _GstGLVideoMixerCollect GstGLVideoMixerCollect;
/**
* GstGLVideoMixerPad:
*
* The opaque #GstGLVideoMixerPad structure.
*/
struct _GstGLVideoMixerPad
{
GstGLMixerPad parent;
/* < private > */
/* properties */
gint xpos, ypos;
gint width, height;
gdouble alpha;
GstGLVideoMixerBlendEquation blend_equation_rgb;
GstGLVideoMixerBlendEquation blend_equation_alpha;
GstGLVideoMixerBlendFunction blend_function_src_rgb;
GstGLVideoMixerBlendFunction blend_function_src_alpha;
GstGLVideoMixerBlendFunction blend_function_dst_rgb;
GstGLVideoMixerBlendFunction blend_function_dst_alpha;
gdouble blend_constant_color_red;
gdouble blend_constant_color_green;
gdouble blend_constant_color_blue;
gdouble blend_constant_color_alpha;
gboolean geometry_change;
GLuint vertex_buffer;
};
struct _GstGLVideoMixerPadClass
{
GstGLMixerPadClass parent_class;
};
GType gst_gl_video_mixer_pad_get_type (void);
G_DEFINE_TYPE (GstGLVideoMixerPad, gst_gl_video_mixer_pad,
GST_TYPE_GL_MIXER_PAD);
static void gst_gl_video_mixer_pad_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_pad_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
enum
{
PROP_PAD_0,
PROP_PAD_XPOS,
PROP_PAD_YPOS,
PROP_PAD_WIDTH,
PROP_PAD_HEIGHT,
PROP_PAD_ALPHA,
PROP_PAD_BLEND_EQUATION_RGB,
PROP_PAD_BLEND_EQUATION_ALPHA,
PROP_PAD_BLEND_FUNCTION_SRC_RGB,
PROP_PAD_BLEND_FUNCTION_SRC_ALPHA,
PROP_PAD_BLEND_FUNCTION_DST_RGB,
PROP_PAD_BLEND_FUNCTION_DST_ALPHA,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
};
static void
gst_gl_video_mixer_pad_init (GstGLVideoMixerPad * pad)
{
pad->alpha = DEFAULT_PAD_ALPHA;
pad->blend_equation_rgb = DEFAULT_PAD_BLEND_EQUATION_RGB;
pad->blend_equation_alpha = DEFAULT_PAD_BLEND_EQUATION_ALPHA;
pad->blend_function_src_rgb = DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB;
pad->blend_function_src_alpha = DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA;
pad->blend_function_dst_rgb = DEFAULT_PAD_BLEND_FUNCTION_DST_RGB;
pad->blend_function_dst_alpha = DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA;
}
static void
gst_gl_video_mixer_pad_class_init (GstGLVideoMixerPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_gl_video_mixer_pad_set_property;
gobject_class->get_property = gst_gl_video_mixer_pad_get_property;
g_object_class_install_property (gobject_class, PROP_PAD_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_WIDTH,
g_param_spec_int ("width", "Width", "Width of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_WIDTH,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_HEIGHT,
g_param_spec_int ("height", "Height", "Height of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_HEIGHT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_BLEND_EQUATION_RGB,
g_param_spec_enum ("blend-equation-rgb", "Blend Equation RGB",
"Blend Equation for RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_EQUATION_ALPHA,
g_param_spec_enum ("blend-equation-alpha", "Blend Equation Alpha",
"Blend Equation for Alpha", GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_RGB,
g_param_spec_enum ("blend-function-src-rgb", "Blend Function Source RGB",
"Blend Function for Source RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_ALPHA,
g_param_spec_enum ("blend-function-src-alpha",
"Blend Function Source Alpha", "Blend Function for Source Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_RGB,
g_param_spec_enum ("blend-function-dst-rgb",
"Blend Function Destination RGB",
"Blend Function for Destination RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_ALPHA,
g_param_spec_enum ("blend-function-dst-alpha",
"Blend Function Destination Alpha",
"Blend Function for Destiniation Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED,
g_param_spec_double ("blend-constant-color-red",
"Blend Constant Color Red", "Blend Constant Color Red", 0.0, 1.0, 0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
g_param_spec_double ("blend-constant-color-green",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
g_param_spec_double ("blend-constant-color-blue",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
g_param_spec_double ("blend-constant-color-alpha",
"Blend Constant Color Alpha", "Blend Constant Color Alpha", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
gst_gl_video_mixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (object);
switch (prop_id) {
case PROP_PAD_XPOS:
g_value_set_int (value, pad->xpos);
break;
case PROP_PAD_YPOS:
g_value_set_int (value, pad->ypos);
break;
case PROP_PAD_WIDTH:
g_value_set_int (value, pad->width);
break;
case PROP_PAD_HEIGHT:
g_value_set_int (value, pad->height);
break;
case PROP_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
case PROP_PAD_BLEND_EQUATION_RGB:
g_value_set_enum (value, pad->blend_equation_rgb);
break;
case PROP_PAD_BLEND_EQUATION_ALPHA:
g_value_set_enum (value, pad->blend_equation_alpha);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_RGB:
g_value_set_enum (value, pad->blend_function_src_rgb);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_ALPHA:
g_value_set_enum (value, pad->blend_function_src_alpha);
break;
case PROP_PAD_BLEND_FUNCTION_DST_RGB:
g_value_set_enum (value, pad->blend_function_dst_rgb);
break;
case PROP_PAD_BLEND_FUNCTION_DST_ALPHA:
g_value_set_enum (value, pad->blend_function_dst_alpha);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED:
g_value_set_double (value, pad->blend_constant_color_red);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN:
g_value_set_double (value, pad->blend_constant_color_green);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE:
g_value_set_double (value, pad->blend_constant_color_blue);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA:
g_value_set_double (value, pad->blend_constant_color_alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_video_mixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (object);
GstGLMixer *mix = GST_GL_MIXER (gst_pad_get_parent (GST_PAD (pad)));
switch (prop_id) {
case PROP_PAD_XPOS:
pad->xpos = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_YPOS:
pad->ypos = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_WIDTH:
pad->width = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_HEIGHT:
pad->height = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
case PROP_PAD_BLEND_EQUATION_RGB:
pad->blend_equation_rgb = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_EQUATION_ALPHA:
pad->blend_equation_alpha = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_RGB:
pad->blend_function_src_rgb = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_ALPHA:
pad->blend_function_src_alpha = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_DST_RGB:
pad->blend_function_dst_rgb = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_DST_ALPHA:
pad->blend_function_dst_alpha = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED:
pad->blend_constant_color_red = g_value_get_double (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN:
pad->blend_constant_color_green = g_value_get_double (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE:
pad->blend_constant_color_blue = g_value_get_double (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA:
pad->blend_constant_color_alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
gst_object_unref (mix);
}
static void
_del_buffer (GstGLContext * context, GLuint * pBuffer)
{
context->gl_vtable->DeleteBuffers (1, pBuffer);
}
static void
gst_gl_video_mixer_release_pad (GstElement * element, GstPad * p)
{
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (p);
if (pad->vertex_buffer) {
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (element);
gst_gl_context_thread_add (mix->context, (GstGLContextThreadFunc)
_del_buffer, &pad->vertex_buffer);
pad->vertex_buffer = 0;
}
GST_ELEMENT_CLASS (g_type_class_peek_parent (G_OBJECT_GET_CLASS (element)))
->release_pad (element, p);
}
static void
gst_gl_video_mixer_class_init (GstGLVideoMixerClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstAggregatorClass *agg_class = (GstAggregatorClass *) klass;
GstVideoAggregatorClass *vagg_class = (GstVideoAggregatorClass *) klass;
GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_CLASS (klass);
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
element_class->release_pad = gst_gl_video_mixer_release_pad;
gobject_class->set_property = gst_gl_video_mixer_set_property;
gobject_class->get_property = gst_gl_video_mixer_get_property;
gst_element_class_set_metadata (element_class, "OpenGL video_mixer",
"Filter/Effect/Video/Compositor", "OpenGL video_mixer",
"Matthew Waters <matthew@centricular.com>");
g_object_class_install_property (gobject_class, PROP_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_GL_TYPE_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_GL_MIXER_CLASS (klass)->set_caps = gst_gl_video_mixer_init_shader;
GST_GL_MIXER_CLASS (klass)->reset = gst_gl_video_mixer_reset;
GST_GL_MIXER_CLASS (klass)->process_textures =
gst_gl_video_mixer_process_textures;
vagg_class->update_caps = _update_caps;
vagg_class->fixate_caps = _fixate_caps;
agg_class->sinkpads_type = GST_TYPE_GL_VIDEO_MIXER_PAD;
mix_class->propose_allocation = gst_gl_video_mixer_propose_allocation;
GST_GL_BASE_MIXER_CLASS (klass)->supported_gl_api =
GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2;
}
static void
gst_gl_video_mixer_init (GstGLVideoMixer * video_mixer)
{
video_mixer->background = DEFAULT_BACKGROUND;
video_mixer->shader = NULL;
}
static void
gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLVideoMixer *mixer = GST_GL_VIDEO_MIXER (object);
switch (prop_id) {
case PROP_BACKGROUND:
mixer->background = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLVideoMixer *mixer = GST_GL_VIDEO_MIXER (object);
switch (prop_id) {
case PROP_BACKGROUND:
g_value_set_enum (value, mixer->background);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_video_mixer_propose_allocation (GstGLBaseMixer * base_mix,
GstGLBaseMixerPad * base_pad, GstQuery * decide_query, GstQuery * query)
{
if (!GST_GL_BASE_MIXER_CLASS (parent_class)->propose_allocation (base_mix,
base_pad, decide_query, query))
return FALSE;
gst_query_add_allocation_meta (query,
GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE, 0);
return TRUE;
}
static void
_mixer_pad_get_output_size (GstGLVideoMixer * mix,
GstGLVideoMixerPad * mix_pad, gint out_par_n, gint out_par_d, gint * width,
gint * height)
{
GstVideoAggregatorPad *vagg_pad = GST_VIDEO_AGGREGATOR_PAD (mix_pad);
gint pad_width, pad_height;
guint dar_n, dar_d;
/* FIXME: Anything better we can do here? */
if (!vagg_pad->info.finfo
|| vagg_pad->info.finfo->format == GST_VIDEO_FORMAT_UNKNOWN) {
GST_DEBUG_OBJECT (mix_pad, "Have no caps yet");
*width = 0;
*height = 0;
return;
}
pad_width =
mix_pad->width <=
0 ? GST_VIDEO_INFO_WIDTH (&vagg_pad->info) : mix_pad->width;
pad_height =
mix_pad->height <=
0 ? GST_VIDEO_INFO_HEIGHT (&vagg_pad->info) : mix_pad->height;
gst_video_calculate_display_ratio (&dar_n, &dar_d, pad_width, pad_height,
GST_VIDEO_INFO_PAR_N (&vagg_pad->info),
GST_VIDEO_INFO_PAR_D (&vagg_pad->info), out_par_n, out_par_d);
GST_LOG_OBJECT (mix_pad, "scaling %ux%u by %u/%u (%u/%u / %u/%u)", pad_width,
pad_height, dar_n, dar_d, GST_VIDEO_INFO_PAR_N (&vagg_pad->info),
GST_VIDEO_INFO_PAR_D (&vagg_pad->info), out_par_n, out_par_d);
if (pad_height % dar_n == 0) {
pad_width = gst_util_uint64_scale_int (pad_height, dar_n, dar_d);
} else if (pad_width % dar_d == 0) {
pad_height = gst_util_uint64_scale_int (pad_width, dar_d, dar_n);
} else {
pad_width = gst_util_uint64_scale_int (pad_height, dar_n, dar_d);
}
if (width)
*width = pad_width;
if (height)
*height = pad_height;
}
static GstCaps *
_update_caps (GstVideoAggregator * vagg, GstCaps * caps, GstCaps * filter)
{
GstCaps *ret;
if (filter) {
ret = gst_caps_intersect (caps, filter);
} else {
ret = gst_caps_ref (caps);
}
return ret;
}
static GstCaps *
_fixate_caps (GstVideoAggregator * vagg, GstCaps * caps)
{
GstGLVideoMixer *mix = GST_GL_VIDEO_MIXER (vagg);
gint best_width = 0, best_height = 0;
gint best_fps_n = 0, best_fps_d = 0;
gint par_n, par_d;
gdouble best_fps = 0.;
GstCaps *ret = NULL;
GstStructure *s;
GList *l;
ret = gst_caps_make_writable (caps);
/* we need this to calculate how large to make the output frame */
s = gst_caps_get_structure (ret, 0);
if (!gst_structure_has_field (s, "pixel-aspect-ratio")) {
gst_structure_set (s, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL);
}
gst_structure_fixate_field_nearest_fraction (s, "pixel-aspect-ratio", 1, 1);
gst_structure_get_fraction (s, "pixel-aspect-ratio", &par_n, &par_d);
GST_OBJECT_LOCK (vagg);
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *vaggpad = l->data;
GstGLVideoMixerPad *mixer_pad = GST_GL_VIDEO_MIXER_PAD (vaggpad);
gint this_width, this_height;
gint width, height;
gint fps_n, fps_d;
gdouble cur_fps;
fps_n = GST_VIDEO_INFO_FPS_N (&vaggpad->info);
fps_d = GST_VIDEO_INFO_FPS_D (&vaggpad->info);
_mixer_pad_get_output_size (mix, mixer_pad, par_n, par_d, &width, &height);
if (width == 0 || height == 0)
continue;
this_width = width + MAX (mixer_pad->xpos, 0);
this_height = height + MAX (mixer_pad->ypos, 0);
if (best_width < this_width)
best_width = this_width;
if (best_height < this_height)
best_height = this_height;
if (fps_d == 0)
cur_fps = 0.0;
else
gst_util_fraction_to_double (fps_n, fps_d, &cur_fps);
if (best_fps < cur_fps) {
best_fps = cur_fps;
best_fps_n = fps_n;
best_fps_d = fps_d;
}
}
GST_OBJECT_UNLOCK (vagg);
if (best_fps_n <= 0 || best_fps_d <= 0 || best_fps == 0.0) {
best_fps_n = 25;
best_fps_d = 1;
best_fps = 25.0;
}
s = gst_caps_get_structure (ret, 0);
gst_structure_fixate_field_nearest_int (s, "width", best_width);
gst_structure_fixate_field_nearest_int (s, "height", best_height);
gst_structure_fixate_field_nearest_fraction (s, "framerate", best_fps_n,
best_fps_d);
ret = gst_caps_fixate (ret);
return ret;
}
static gboolean
_reset_pad_gl (GstAggregator * agg, GstAggregatorPad * aggpad, gpointer udata)
{
const GstGLFuncs *gl = GST_GL_BASE_MIXER (agg)->context->gl_vtable;
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (aggpad);
if (pad->vertex_buffer) {
gl->DeleteBuffers (1, &pad->vertex_buffer);
pad->vertex_buffer = 0;
}
return TRUE;
}
static void
_reset_gl (GstGLContext * context, GstGLVideoMixer * video_mixer)
{
const GstGLFuncs *gl = GST_GL_BASE_MIXER (video_mixer)->context->gl_vtable;
if (video_mixer->vao) {
gl->DeleteVertexArrays (1, &video_mixer->vao);
video_mixer->vao = 0;
}
if (video_mixer->vbo_indices) {
gl->DeleteBuffers (1, &video_mixer->vbo_indices);
video_mixer->vbo_indices = 0;
}
if (video_mixer->checker_vbo) {
gl->DeleteBuffers (1, &video_mixer->checker_vbo);
video_mixer->checker_vbo = 0;
}
gst_aggregator_iterate_sinkpads (GST_AGGREGATOR (video_mixer), _reset_pad_gl,
NULL);
}
static void
gst_gl_video_mixer_reset (GstGLMixer * mixer)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
GstGLContext *context = GST_GL_BASE_MIXER (mixer)->context;
GST_DEBUG_OBJECT (mixer, "context:%p", context);
if (video_mixer->shader)
gst_gl_context_del_shader (context, video_mixer->shader);
video_mixer->shader = NULL;
if (video_mixer->checker)
gst_gl_context_del_shader (context, video_mixer->checker);
video_mixer->checker = NULL;
if (GST_GL_BASE_MIXER (mixer)->context)
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _reset_gl,
mixer);
}
static gboolean
gst_gl_video_mixer_init_shader (GstGLMixer * mixer, GstCaps * outcaps)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
if (video_mixer->shader)
gst_gl_context_del_shader (GST_GL_BASE_MIXER (mixer)->context,
video_mixer->shader);
return gst_gl_context_gen_shader (GST_GL_BASE_MIXER (mixer)->context,
gst_gl_shader_string_vertex_mat4_vertex_transform,
video_mixer_f_src, &video_mixer->shader);
}
static void
_video_mixer_process_gl (GstGLContext * context, GstGLVideoMixer * video_mixer)
{
GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
gst_gl_framebuffer_draw_to_texture (mixer->fbo, video_mixer->out_tex,
gst_gl_video_mixer_callback, video_mixer);
}
static gboolean
gst_gl_video_mixer_process_textures (GstGLMixer * mix, GstGLMemory * out_tex)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mix);
GstGLContext *context = GST_GL_BASE_MIXER (mix)->context;
video_mixer->out_tex = out_tex;
gst_gl_context_thread_add (context,
(GstGLContextThreadFunc) _video_mixer_process_gl, video_mixer);
return TRUE;
}
static const GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
static void
_init_vbo_indices (GstGLVideoMixer * mixer)
{
const GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;
if (!mixer->vbo_indices) {
gl->GenBuffers (1, &mixer->vbo_indices);
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, mixer->vbo_indices);
gl->BufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof (indices), indices,
GL_STATIC_DRAW);
}
}
static gboolean
_draw_checker_background (GstGLVideoMixer * video_mixer)
{
GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
const GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;
gint attr_position_loc = 0;
/* *INDENT-OFF* */
gfloat v_vertices[] = {
-1.0,-1.0,-1.0f,
1.0,-1.0,-1.0f,
1.0, 1.0,-1.0f,
-1.0, 1.0,-1.0f,
};
/* *INDENT-ON* */
if (!video_mixer->checker) {
if (!gst_gl_context_gen_shader (GST_GL_BASE_MIXER (mixer)->context,
checker_v_src, checker_f_src, &video_mixer->checker))
return FALSE;
}
gst_gl_shader_use (video_mixer->checker);
attr_position_loc =
gst_gl_shader_get_attribute_location (video_mixer->checker, "a_position");
_init_vbo_indices (video_mixer);
if (!video_mixer->checker_vbo) {
gl->GenBuffers (1, &video_mixer->checker_vbo);
gl->BindBuffer (GL_ARRAY_BUFFER, video_mixer->checker_vbo);
gl->BufferData (GL_ARRAY_BUFFER, 4 * 3 * sizeof (GLfloat), v_vertices,
GL_STATIC_DRAW);
} else {
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, video_mixer->vbo_indices);
gl->BindBuffer (GL_ARRAY_BUFFER, video_mixer->checker_vbo);
}
gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
GL_FALSE, 3 * sizeof (GLfloat), (void *) 0);
gl->EnableVertexAttribArray (attr_position_loc);
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
gl->DisableVertexAttribArray (attr_position_loc);
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0);
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
return TRUE;
}
static gboolean
_draw_background (GstGLVideoMixer * video_mixer)
{
GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
const GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;
switch (video_mixer->background) {
case GST_GL_VIDEO_MIXER_BACKGROUND_BLACK:
gl->ClearColor (0.0, 0.0, 0.0, 1.0);
gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
break;
case GST_GL_VIDEO_MIXER_BACKGROUND_WHITE:
gl->ClearColor (1.0, 1.0, 1.0, 1.0);
gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
break;
case GST_GL_VIDEO_MIXER_BACKGROUND_TRANSPARENT:
gl->ClearColor (0.0, 0.0, 0.0, 0.0);
gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
break;
case GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER:
return _draw_checker_background (video_mixer);
break;
default:
break;
}
return TRUE;
}
static guint
_blend_equation_to_gl (GstGLVideoMixerBlendEquation equation)
{
switch (equation) {
case GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD:
return GL_FUNC_ADD;
case GST_GL_VIDEO_MIXER_BLEND_EQUATION_SUBTRACT:
return GL_FUNC_SUBTRACT;
case GST_GL_VIDEO_MIXER_BLEND_EQUATION_REVERSE_SUBTRACT:
return GL_FUNC_REVERSE_SUBTRACT;
default:
g_assert_not_reached ();
return 0;
}
}
static guint
_blend_function_to_gl (GstGLVideoMixerBlendFunction equation)
{
switch (equation) {
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ZERO:
return GL_ZERO;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE:
return GL_ONE;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_COLOR:
return GL_SRC_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_COLOR:
return GL_ONE_MINUS_SRC_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_COLOR:
return GL_DST_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_COLOR:
return GL_ONE_MINUS_DST_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA:
return GL_SRC_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA:
return GL_ONE_MINUS_SRC_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_ALPHA:
return GL_DST_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_ALPHA:
return GL_ONE_MINUS_DST_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_COLOR:
return GL_CONSTANT_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR:
return GL_ONE_MINUS_CONSTANT_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_ALPHA:
return GL_CONSTANT_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_ALPHA:
return GL_ONE_MINUS_CONSTANT_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE:
return GL_SRC_ALPHA_SATURATE;
default:
g_assert_not_reached ();
return 0;
}
}
static gboolean
_set_blend_state (GstGLVideoMixer * video_mixer, GstGLVideoMixerPad * mix_pad)
{
const GstGLFuncs *gl = GST_GL_BASE_MIXER (video_mixer)->context->gl_vtable;
gboolean require_separate = FALSE;
guint gl_func_src_rgb, gl_func_src_alpha, gl_func_dst_rgb, gl_func_dst_alpha;
guint gl_equation_rgb, gl_equation_alpha;
require_separate =
mix_pad->blend_equation_rgb != mix_pad->blend_equation_alpha
|| mix_pad->blend_function_src_rgb != mix_pad->blend_function_src_alpha
|| mix_pad->blend_function_dst_rgb != mix_pad->blend_function_dst_alpha;
if (require_separate && (!gl->BlendFuncSeparate
|| !gl->BlendEquationSeparate)) {
GST_ERROR_OBJECT (mix_pad,
"separated blend equations/functions requested however "
"glBlendFuncSeparate or glBlendEquationSeparate not available");
return FALSE;
}
if (mix_pad->blend_function_dst_rgb ==
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE) {
GST_ERROR_OBJECT (mix_pad,
"Destination RGB blend function cannot be \'SRC_ALPHA_SATURATE\'");
return FALSE;
}
if (mix_pad->blend_function_dst_alpha ==
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE) {
GST_ERROR_OBJECT (mix_pad,
"Destination alpha blend function cannot be \'SRC_ALPHA_SATURATE\'");
return FALSE;
}
gl_equation_rgb = _blend_equation_to_gl (mix_pad->blend_equation_rgb);
gl_equation_alpha = _blend_equation_to_gl (mix_pad->blend_equation_alpha);
gl_func_src_rgb = _blend_function_to_gl (mix_pad->blend_function_src_rgb);
gl_func_src_alpha = _blend_function_to_gl (mix_pad->blend_function_src_alpha);
gl_func_dst_rgb = _blend_function_to_gl (mix_pad->blend_function_dst_rgb);
gl_func_dst_alpha = _blend_function_to_gl (mix_pad->blend_function_dst_alpha);
if (gl->BlendEquationSeparate)
gl->BlendEquationSeparate (gl_equation_rgb, gl_equation_alpha);
else
gl->BlendEquation (gl_equation_rgb);
if (gl->BlendFuncSeparate)
gl->BlendFuncSeparate (gl_func_src_rgb, gl_func_dst_rgb, gl_func_src_alpha,
gl_func_dst_alpha);
else
gl->BlendFunc (gl_func_src_rgb, gl_func_dst_rgb);
gl->BlendColor (mix_pad->blend_constant_color_red,
mix_pad->blend_constant_color_green, mix_pad->blend_constant_color_blue,
mix_pad->blend_constant_color_alpha);
return TRUE;
}
/* opengl scene, params: input texture (not the output mixer->texture) */
static gboolean
gst_gl_video_mixer_callback (gpointer stuff)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (stuff);
GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR (stuff);
GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;
GLint attr_position_loc = 0;
GLint attr_texture_loc = 0;
guint out_width, out_height;
GList *walk;
out_width = GST_VIDEO_INFO_WIDTH (&vagg->info);
out_height = GST_VIDEO_INFO_HEIGHT (&vagg->info);
gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context);
gl->BindTexture (GL_TEXTURE_2D, 0);
gl->Disable (GL_DEPTH_TEST);
gl->Disable (GL_CULL_FACE);
if (gl->GenVertexArrays) {
if (!video_mixer->vao)
gl->GenVertexArrays (1, &video_mixer->vao);
gl->BindVertexArray (video_mixer->vao);
}
if (!_draw_background (video_mixer))
return FALSE;
gst_gl_shader_use (video_mixer->shader);
attr_position_loc =
gst_gl_shader_get_attribute_location (video_mixer->shader, "a_position");
attr_texture_loc =
gst_gl_shader_get_attribute_location (video_mixer->shader, "a_texcoord");
gl->Enable (GL_BLEND);
GST_OBJECT_LOCK (video_mixer);
walk = GST_ELEMENT (video_mixer)->sinkpads;
while (walk) {
GstGLMixerPad *mix_pad = walk->data;
GstGLVideoMixerPad *pad = walk->data;
GstVideoAggregatorPad *vagg_pad = walk->data;
GstVideoInfo *v_info;
guint in_tex;
guint in_width, in_height;
/* *INDENT-OFF* */
gfloat v_vertices[] = {
-1.0,-1.0,-1.0f, 0.0f, 0.0f,
1.0,-1.0,-1.0f, 1.0f, 0.0f,
1.0, 1.0,-1.0f, 1.0f, 1.0f,
-1.0, 1.0,-1.0f, 0.0f, 1.0f,
};
/* *INDENT-ON* */
v_info = &GST_VIDEO_AGGREGATOR_PAD (pad)->info;
in_width = GST_VIDEO_INFO_WIDTH (v_info);
in_height = GST_VIDEO_INFO_HEIGHT (v_info);
if (!mix_pad->current_texture || in_width <= 0 || in_height <= 0
|| pad->alpha == 0.0f) {
GST_DEBUG ("skipping texture:%u pad:%p width:%u height:%u alpha:%f",
mix_pad->current_texture, pad, in_width, in_height, pad->alpha);
walk = g_list_next (walk);
continue;
}
if (!_set_blend_state (video_mixer, pad)) {
GST_FIXME_OBJECT (pad, "skipping due to incorrect blend parameters");
walk = g_list_next (walk);
continue;
}
in_tex = mix_pad->current_texture;
_init_vbo_indices (video_mixer);
if (pad->geometry_change || !pad->vertex_buffer) {
gint pad_width, pad_height;
gfloat w, h;
_mixer_pad_get_output_size (video_mixer, pad,
GST_VIDEO_INFO_PAR_N (&vagg->info),
GST_VIDEO_INFO_PAR_D (&vagg->info), &pad_width, &pad_height);
w = ((gfloat) pad_width / (gfloat) out_width);
h = ((gfloat) pad_height / (gfloat) out_height);
/* top-left */
v_vertices[0] = v_vertices[15] =
2.0f * (gfloat) pad->xpos / (gfloat) out_width - 1.0f;
/* bottom-left */
v_vertices[1] = v_vertices[6] =
2.0f * (gfloat) pad->ypos / (gfloat) out_height - 1.0f;
/* top-right */
v_vertices[5] = v_vertices[10] = v_vertices[0] + 2.0f * w;
/* bottom-right */
v_vertices[11] = v_vertices[16] = v_vertices[1] + 2.0f * h;
GST_TRACE ("processing texture:%u dimensions:%ux%u, at %f,%f %fx%f with "
"alpha:%f", in_tex, in_width, in_height, v_vertices[0], v_vertices[1],
v_vertices[5], v_vertices[11], pad->alpha);
if (!pad->vertex_buffer)
gl->GenBuffers (1, &pad->vertex_buffer);
gl->BindBuffer (GL_ARRAY_BUFFER, pad->vertex_buffer);
gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), v_vertices,
GL_STATIC_DRAW);
pad->geometry_change = FALSE;
} else {
gl->BindBuffer (GL_ARRAY_BUFFER, pad->vertex_buffer);
}
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, video_mixer->vbo_indices);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, in_tex);
gst_gl_shader_set_uniform_1i (video_mixer->shader, "texture", 0);
gst_gl_shader_set_uniform_1f (video_mixer->shader, "alpha", pad->alpha);
{
GstVideoAffineTransformationMeta *af_meta;
gfloat matrix[16];
af_meta =
gst_buffer_get_video_affine_transformation_meta (vagg_pad->buffer);
gst_gl_get_affine_transformation_meta_as_ndc (af_meta, matrix);
gst_gl_shader_set_uniform_matrix_4fv (video_mixer->shader,
"u_transformation", 1, FALSE, matrix);
}
gl->EnableVertexAttribArray (attr_position_loc);
gl->EnableVertexAttribArray (attr_texture_loc);
gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) 0);
gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat)));
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
walk = g_list_next (walk);
}
GST_OBJECT_UNLOCK (video_mixer);
gl->DisableVertexAttribArray (attr_position_loc);
gl->DisableVertexAttribArray (attr_texture_loc);
if (gl->GenVertexArrays)
gl->BindVertexArray (0);
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0);
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
gl->BindTexture (GL_TEXTURE_2D, 0);
gl->Disable (GL_BLEND);
gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context);
return TRUE;
}
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