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gstreamer/subprojects/gst-plugins-base/ext/gl/gstglvideomixer.c
Georges Basile Stavracas Neto a8a7ee6d83 glvideomixer: Add xalign and yalign properties 
With the addition of the 'keep-aspect-ratio' sizing policy, content
that doesn't fit the target size is downscaled according to its own
aspect ratio to fit that target size, and centered.

Centering might not always be the desired behaviour, however;
consumers of this API might want to align the resulting picture to
the left or to the right.

To account for any of these cases, add two new properties to the
glvideomixer pad: xalign, and yalign. They operate on normalized
coordinates (0.0 for start, 1.0 for end), and default to 0.5 which
centers content.

<https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3762>

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3762>
2023-01-27 16:21:28 +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
* @title: 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.
*
* ## Examples
* |[
* gst-launch-1.0 glvideomixer name=m ! glimagesink \
* videotestsrc ! video/x-raw, format=YUY2 ! glupload ! glcolorconvert ! m. \
* videotestsrc pattern=12 ! video/x-raw, format=I420, framerate=5/1, width=100, height=200 ! queue ! \
* glupload ! glcolorconvert ! m. \
* videotestsrc ! glupload ! gleffects effect=2 ! queue ! m. \
* videotestsrc ! glupload ! glfiltercube ! queue ! m. \
* videotestsrc ! glupload ! gleffects effect=6 ! queue ! m.
* ]|
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/controller/gstproxycontrolbinding.h>
#include <gst/gl/gstglfuncs.h>
#include <gst/video/gstvideoaffinetransformationmeta.h>
#include "gstglelements.h"
#include "gstglvideomixer.h"
#include "gstglmixerbin.h"
#include "gstglutils.h"
#define GST_CAT_DEFAULT gst_gl_video_mixer_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
(GST_CAPS_FEATURE_MEMORY_GL_MEMORY,
"RGBA"))
);
#define GST_TYPE_GL_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_ALPHA,
"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 GST_TYPE_GL_VIDEO_MIXER_SIZING_POLICY (gst_gl_video_mixer_sizing_policy_get_type())
static GType
gst_gl_video_mixer_sizing_policy_get_type (void)
{
static GType sizing_policy_type = 0;
static const GEnumValue sizing_polices[] = {
{GST_GL_VIDEO_MIXER_SIZING_POLICY_NONE,
"None: Image is scaled to fill configured destination rectangle without "
"padding or keeping the aspect ratio", "none"},
{GST_GL_VIDEO_MIXER_SIZING_POLICY_KEEP_ASPECT_RATIO,
"Keep Aspect Ratio: Image is scaled to fit destination rectangle "
"specified by GstGLVideoMixerPad:{xpos, ypos, width, height} "
"with preserved aspect ratio. The empty space of the resulting image "
"will be distributed in the destination rectangle according to the "
"GstGLVideoMixerPad:{xalign, yalign} values",
"keep-aspect-ratio"},
{0, NULL, NULL},
};
if (!sizing_policy_type) {
sizing_policy_type =
g_enum_register_static ("GstGLVideoMixerSizingPolicy", sizing_polices);
}
return sizing_policy_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_REPEAT_AFTER_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_ONE
#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
#define DEFAULT_PAD_CROP 0
#define DEFAULT_PAD_SIZING_POLICY GST_GL_VIDEO_MIXER_SIZING_POLICY_NONE
#define DEFAULT_PAD_XALIGN 0.5
#define DEFAULT_PAD_YALIGN 0.5
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_REPEAT_AFTER_EOS,
PROP_INPUT_CROP_LEFT,
PROP_INPUT_CROP_RIGHT,
PROP_INPUT_CROP_TOP,
PROP_INPUT_CROP_BOTTOM,
PROP_INPUT_SIZING_POLICY,
PROP_INPUT_XALIGN,
PROP_INPUT_YALIGN,
};
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);
static gboolean gst_gl_video_mixer_src_event (GstAggregator * agg,
GstEvent * event);
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_REPEAT_AFTER_EOS,
g_param_spec_boolean ("repeat-after-eos", "Repeat After EOS",
"Aggregate the last "
"frame on pads that are EOS till they are released",
DEFAULT_PAD_REPEAT_AFTER_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 Destination 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));
/**
* GstGLVideoMixerInput:crop-left:
*
* Defines how many pixels of the input in input size should be cropped on
* the left side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_INPUT_CROP_LEFT,
g_param_spec_int ("crop-left", "Crop Left", "Crop left of the picture", 0,
G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerInput:crop-right:
*
* Defines how many pixels of the input in input size should be cropped on
* the right side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_INPUT_CROP_RIGHT,
g_param_spec_int ("crop-right", "Crop Right", "Crop right of the picture",
0, G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerInput:crop-top:
*
* Defines how many pixels of the input in input size should be cropped on
* the top side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_INPUT_CROP_TOP,
g_param_spec_int ("crop-top", "Crop Top", "Crop top of the picture", 0,
G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerInput:crop-bottom:
*
* Defines how many pixels of the input in input size should be cropped on
* the bottom side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_INPUT_CROP_BOTTOM,
g_param_spec_int ("crop-bottom", "Crop Bottom",
"Crop bottom of the picture", 0, G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerInput:sizing-policy:
*
* Specifies sizing policy to use. Depending on selected sizing policy,
* scaled image might not fully cover the configured target rectangle area
* (e.g., "keep-aspect-ratio"). In that case, any uncovered area will be
* filled with background unless the uncovered area is drawn by other image.
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_INPUT_SIZING_POLICY,
g_param_spec_enum ("sizing-policy", "Sizing policy",
"Sizing policy to use for image scaling",
GST_TYPE_GL_VIDEO_MIXER_SIZING_POLICY, DEFAULT_PAD_SIZING_POLICY,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerInput:xalign:
*
* Defines the alignment of the input within the available horizontal space,
* relative to #GstGLVideoMixerPad:width and #GstGLVideoMixerPad:height.
* Values range from 0.0 (left) to 1.0 (right).
*
* The image is aligned in the available space as if the pivot point is
* matching the alignment. For example, setting the `xalign` property to 0.0
* will align the left edge of the image with the left edge of the bounding
* box; 0.5 aligns the horizontal center of the image with the horizontal
* center of the bounding box; 1.0 aligns the right edge of the image with the
* right edge of the bounding box; and so it goes.
*
* This property is only effective when #GstGLVideoMixerInput:sizing-policy
* is set to 'keep-aspect-ratio'.
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_INPUT_XALIGN,
g_param_spec_double ("xalign", "X alignment",
"X alignment of the picture", 0.0, 1.0, DEFAULT_PAD_XALIGN,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerInput:yalign:
*
* Defines the alignment of the input within the available vertical space,
* relative to #GstGLVideoMixerPad:width and #GstGLVideoMixerPad:height.
* Values range from 0.0 (top) to 1.0 (bottom).
*
* The image is aligned in the available space as if the pivot point is
* matching the alignment. For example, setting the `xalign` property to 0.0
* will align the left edge of the image with the left edge of the bounding
* box; 0.5 aligns the horizontal center of the image with the horizontal
* center of the bounding box; 1.0 aligns the right edge of the image with the
* right edge of the bounding box; and so it goes.
*
* This property is only effective when #GstGLVideoMixerInput:sizing-policy
* is set to 'keep-aspect-ratio'.
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_INPUT_YALIGN,
g_param_spec_double ("yalign", "Y alignment",
"Y alignment of the picture", 0.0, 1.0, DEFAULT_PAD_YALIGN,
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);
#define ADD_BINDING(obj,ref,prop) \
gst_object_add_control_binding (GST_OBJECT (obj), \
gst_proxy_control_binding_new (GST_OBJECT (obj), prop, \
GST_OBJECT (ref), prop));
ADD_BINDING (mixer_pad, input, "zorder");
ADD_BINDING (mixer_pad, input, "xpos");
ADD_BINDING (mixer_pad, input, "ypos");
ADD_BINDING (mixer_pad, input, "width");
ADD_BINDING (mixer_pad, input, "height");
ADD_BINDING (mixer_pad, input, "alpha");
ADD_BINDING (mixer_pad, input, "blend-equation-rgb");
ADD_BINDING (mixer_pad, input, "blend-equation-alpha");
ADD_BINDING (mixer_pad, input, "blend-function-src-rgb");
ADD_BINDING (mixer_pad, input, "blend-function-src-alpha");
ADD_BINDING (mixer_pad, input, "blend-function-dst-rgb");
ADD_BINDING (mixer_pad, input, "blend-function-dst-alpha");
ADD_BINDING (mixer_pad, input, "blend-constant-color-red");
ADD_BINDING (mixer_pad, input, "blend-constant-color-green");
ADD_BINDING (mixer_pad, input, "blend-constant-color-blue");
ADD_BINDING (mixer_pad, input, "blend-constant-color-alpha");
ADD_BINDING (mixer_pad, input, "sizing-policy");
ADD_BINDING (mixer_pad, input, "xalign");
ADD_BINDING (mixer_pad, input, "yalign");
#undef ADD_BINDING
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);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (glvideomixer, "glvideomixer",
GST_RANK_NONE, gst_gl_video_mixer_bin_get_type (),
gl_element_init (plugin));
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);
GstCaps *upload_caps;
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_TYPE_GL_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* override the sink_%u pad template from GstGLMixerBin.
* We pass it the GType of our sink pad so it's properly documented when
* inspecting the element. */
upload_caps = gst_gl_upload_get_input_template_caps ();
gst_element_class_add_pad_template (element_class,
gst_pad_template_new_with_gtype ("sink_%u", GST_PAD_SINK, GST_PAD_REQUEST,
upload_caps, gst_gl_video_mixer_input_get_type ()));
gst_caps_unref (upload_caps);
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>");
gst_type_mark_as_plugin_api (gst_gl_video_mixer_input_get_type (), 0);
}
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,
};
static void gst_gl_video_mixer_child_proxy_init (gpointer g_iface,
gpointer iface_data);
#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,
G_IMPLEMENT_INTERFACE (GST_TYPE_CHILD_PROXY,
gst_gl_video_mixer_child_proxy_init); DEBUG_INIT);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (glvideomixerelement,
"glvideomixerelement", GST_RANK_NONE, gst_gl_video_mixer_get_type (),
gl_element_init (plugin));
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);
static GstCaps *_fixate_caps (GstAggregator * agg, GstCaps * caps);
static gboolean gst_gl_video_mixer_propose_allocation (GstAggregator *
agg, GstAggregatorPad * agg_pad, GstQuery * decide_query, GstQuery * query);
static gboolean gst_gl_video_mixer_gl_start (GstGLBaseMixer * base_mix);
static void gst_gl_video_mixer_gl_stop (GstGLBaseMixer * base_mix);
static gboolean gst_gl_video_mixer_set_caps (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 =
"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 =
"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;
/* properties */
gint xpos, ypos;
gint width, height;
gdouble xalign, yalign;
gdouble alpha;
GstGLVideoMixerSizingPolicy sizing_policy;
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;
gint crop_left, crop_right;
gint crop_top, crop_bottom;
gboolean geometry_change;
GLuint vertex_buffer;
gfloat m_matrix[16];
};
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,
PROP_PAD_CROP_LEFT,
PROP_PAD_CROP_RIGHT,
PROP_PAD_CROP_TOP,
PROP_PAD_CROP_BOTTOM,
PROP_PAD_SIZING_POLICY,
PROP_PAD_XALIGN,
PROP_PAD_YALIGN,
};
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;
pad->sizing_policy = DEFAULT_PAD_SIZING_POLICY;
pad->xalign = DEFAULT_PAD_XALIGN;
pad->yalign = DEFAULT_PAD_YALIGN;
memset (pad->m_matrix, 0, sizeof (gfloat) * 4 * 4);
pad->m_matrix[0] = 1.0;
pad->m_matrix[5] = 1.0;
pad->m_matrix[10] = 1.0;
pad->m_matrix[15] = 1.0;
}
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 Destination 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));
/**
* GstGLVideoMixerPad:crop-left:
*
* Defines how many pixels of the input in input size should be cropped on
* the left side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_PAD_CROP_LEFT,
g_param_spec_int ("crop-left", "Crop Left", "Crop left of the picture", 0,
G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerPad:crop-right:
*
* Defines how many pixels of the input in input size should be cropped on
* the right side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_PAD_CROP_RIGHT,
g_param_spec_int ("crop-right", "Crop Right", "Crop right of the picture",
0, G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerPad:crop-top:
*
* Defines how many pixels of the input in input size should be cropped on
* the top side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_PAD_CROP_TOP,
g_param_spec_int ("crop-top", "Crop Top", "Crop top of the picture", 0,
G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerPad:crop-bottom:
*
* Defines how many pixels of the input in input size should be cropped on
* the bottom side.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_PAD_CROP_BOTTOM,
g_param_spec_int ("crop-bottom", "Crop Bottom",
"Crop bottom of the picture", 0, G_MAXINT, DEFAULT_PAD_CROP,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerPad:sizing-policy:
*
* Specifies sizing policy to use. Depending on selected sizing policy,
* scaled image might not fully cover the configured target rectangle area
* (e.g., "keep-aspect-ratio"). In that case, any uncovered area will be
* filled with background unless the uncovered area is drawn by other image.
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_PAD_SIZING_POLICY,
g_param_spec_enum ("sizing-policy", "Sizing policy",
"Sizing policy to use for image scaling",
GST_TYPE_GL_VIDEO_MIXER_SIZING_POLICY, DEFAULT_PAD_SIZING_POLICY,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerPad:xalign:
*
* Defines the alignment of the input within the available horizontal space,
* relative to #GstGLVideoMixerPad:width and #GstGLVideoMixerPad:height.
* Values range from 0.0 (left) to 1.0 (right).
*
* The image is aligned in the available space as if the pivot point is
* matching the alignment. For example, setting the `xalign` property to 0.0
* will align the left edge of the image with the left edge of the bounding
* box; 0.5 aligns the horizontal center of the image with the horizontal
* center of the bounding box; 1.0 aligns the right edge of the image with the
* right edge of the bounding box; and so it goes.
*
* This property is only effective when #GstGLVideoMixerInput:sizing-policy
* is set to 'keep-aspect-ratio'.
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_PAD_XALIGN,
g_param_spec_double ("xalign", "X alignment",
"X alignment of the picture", 0.0, 1.0, DEFAULT_PAD_XALIGN,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstGLVideoMixerPad:yalign:
*
* Defines the alignment of the input within the available vertical space,
* relative to #GstGLVideoMixerPad:width and #GstGLVideoMixerPad:height.
* Values range from 0.0 (top) to 1.0 (bottom).
*
* The image is aligned in the available space as if the pivot point is
* matching the alignment. For example, setting the `yalign` property to 0.0
* will align the top edge of the image with the top edge of the bounding box;
* 0.5 aligns the vertical center of the image with the vertical center of the
* bounding box; 1.0 aligns the bottom edge of the image with the bottom edge
* of the bounding box; and so it goes.
*
* This property is only effective when #GstGLVideoMixerInput:sizing-policy
* is set to 'keep-aspect-ratio'.
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_PAD_YALIGN,
g_param_spec_double ("yalign", "Y alignment",
"Y alignment of the picture", 0.0, 1.0, DEFAULT_PAD_YALIGN,
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;
case PROP_PAD_CROP_LEFT:
g_value_set_int (value, pad->crop_left);
break;
case PROP_PAD_CROP_RIGHT:
g_value_set_int (value, pad->crop_right);
break;
case PROP_PAD_CROP_TOP:
g_value_set_int (value, pad->crop_top);
break;
case PROP_PAD_CROP_BOTTOM:
g_value_set_int (value, pad->crop_bottom);
break;
case PROP_PAD_SIZING_POLICY:
g_value_set_enum (value, pad->sizing_policy);
break;
case PROP_PAD_XALIGN:
g_value_set_double (value, pad->xalign);
break;
case PROP_PAD_YALIGN:
g_value_set_double (value, pad->yalign);
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)));
GST_OBJECT_LOCK (pad);
switch (prop_id) {
case PROP_PAD_XPOS:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->xpos;
pad->xpos = val;
break;
}
case PROP_PAD_YPOS:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->ypos;
pad->ypos = val;
break;
}
case PROP_PAD_WIDTH:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->width;
pad->width = val;
break;
}
case PROP_PAD_HEIGHT:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->height;
pad->height = val;
}
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;
case PROP_PAD_CROP_LEFT:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->crop_left;
pad->crop_left = val;
break;
}
case PROP_PAD_CROP_RIGHT:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->crop_right;
pad->crop_right = val;
break;
}
case PROP_PAD_CROP_TOP:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->crop_top;
pad->crop_top = val;
break;
}
case PROP_PAD_CROP_BOTTOM:{
gint val = g_value_get_int (value);
pad->geometry_change |= val != pad->crop_bottom;
pad->crop_bottom = val;
break;
}
case PROP_PAD_SIZING_POLICY:{
GstGLVideoMixerSizingPolicy val = g_value_get_enum (value);
pad->geometry_change |= val != pad->sizing_policy;
pad->sizing_policy = val;
break;
}
case PROP_PAD_XALIGN:{
gdouble val = g_value_get_double (value);
pad->geometry_change |= !G_APPROX_VALUE (val, pad->xalign, DBL_EPSILON);
pad->xalign = val;
break;
}
case PROP_PAD_YALIGN:{
gdouble val = g_value_get_double (value);
pad->geometry_change |= !G_APPROX_VALUE (val, pad->yalign, DBL_EPSILON);
pad->yalign = val;
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (pad);
gst_object_unref (mix);
}
static void
_del_buffer (GstGLContext * context, GLuint * pBuffer)
{
context->gl_vtable->DeleteBuffers (1, pBuffer);
}
static GstPad *
gst_gl_video_mixer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
{
GstPad *newpad;
newpad = (GstPad *)
GST_ELEMENT_CLASS (parent_class)->request_new_pad (element,
templ, req_name, caps);
if (newpad == NULL)
goto could_not_create;
gst_child_proxy_child_added (GST_CHILD_PROXY (element), G_OBJECT (newpad),
GST_OBJECT_NAME (newpad));
return newpad;
could_not_create:
{
GST_DEBUG_OBJECT (element, "could not create/add pad");
return NULL;
}
}
static void
gst_gl_video_mixer_release_pad (GstElement * element, GstPad * p)
{
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (p);
gst_child_proxy_child_removed (GST_CHILD_PROXY (element), G_OBJECT (pad),
GST_OBJECT_NAME (pad));
/* we call the base class first as this will remove the pad from
* the aggregator, thus stopping misc callbacks from being called,
* one of which (process_textures) will recreate the vertex_buffer
* if it is destroyed. Calling the parent may release the last ref to the pad
* so we need to keep the pad alive for the follow up clean up */
gst_object_ref (pad);
GST_ELEMENT_CLASS (g_type_class_peek_parent (G_OBJECT_GET_CLASS (element)))
->release_pad (element, 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_object_unref (pad);
}
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;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
element_class->request_new_pad = gst_gl_video_mixer_request_new_pad;
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>");
gst_element_class_add_static_pad_template_with_gtype (element_class,
&sink_factory, GST_TYPE_GL_VIDEO_MIXER_PAD);
g_object_class_install_property (gobject_class, PROP_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_TYPE_GL_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_GL_MIXER_CLASS (klass)->set_caps = gst_gl_video_mixer_set_caps;
GST_GL_MIXER_CLASS (klass)->process_textures =
gst_gl_video_mixer_process_textures;
GST_GL_BASE_MIXER_CLASS (klass)->gl_stop = gst_gl_video_mixer_gl_stop;
GST_GL_BASE_MIXER_CLASS (klass)->gl_start = gst_gl_video_mixer_gl_start;
vagg_class->update_caps = _update_caps;
agg_class->src_event = gst_gl_video_mixer_src_event;
agg_class->fixate_src_caps = _fixate_caps;
agg_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;
gst_type_mark_as_plugin_api (GST_TYPE_GL_VIDEO_MIXER_BACKGROUND, 0);
gst_type_mark_as_plugin_api (GST_TYPE_GL_VIDEO_MIXER_PAD, 0);
gst_type_mark_as_plugin_api (GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION, 0);
gst_type_mark_as_plugin_api (GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION, 0);
gst_type_mark_as_plugin_api (GST_TYPE_GL_VIDEO_MIXER_SIZING_POLICY, 0);
}
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 (GstAggregator * agg,
GstAggregatorPad * agg_pad, GstQuery * decide_query, GstQuery * query)
{
if (!GST_AGGREGATOR_CLASS (parent_class)->propose_allocation (agg,
agg_pad, decide_query, query))
return FALSE;
gst_query_add_allocation_meta (query,
GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE, 0);
return TRUE;
}
static void
align_rect (const GstVideoRectangle * src,
const GstVideoRectangle * dst, GstVideoRectangle * result, gdouble xalign,
gdouble yalign)
{
gdouble src_ratio, dst_ratio;
g_return_if_fail (src->h != 0);
g_return_if_fail (dst->h != 0);
src_ratio = (gdouble) src->w / src->h;
dst_ratio = (gdouble) dst->w / dst->h;
if (src_ratio > dst_ratio) {
result->w = dst->w;
result->h = dst->w / src_ratio;
result->x = dst->x;
result->y = dst->y + (dst->h - result->h) * yalign;
} else if (src_ratio < dst_ratio) {
result->w = dst->h * src_ratio;
result->h = dst->h;
result->x = dst->x + (dst->w - result->w) * xalign;
result->y = dst->y;
} else {
result->x = dst->x;
result->y = dst->y;
result->w = dst->w;
result->h = dst->h;
}
GST_DEBUG ("source is %dx%d dest is %dx%d, result is %dx%d with x,y %dx%d",
src->w, src->h, dst->w, dst->h,
result->w, result->h, result->x, result->y);
}
static void
_mixer_pad_get_output_size (GstGLVideoMixer * mix,
GstGLVideoMixerPad * mix_pad, gint out_par_n, gint out_par_d, gint * width,
gint * height, gint * x_offset, gint * y_offset)
{
GstVideoAggregatorPad *vagg_pad = GST_VIDEO_AGGREGATOR_PAD (mix_pad);
gint pad_width, pad_height;
guint dar_n, dar_d;
*x_offset = 0;
*y_offset = 0;
*width = 0;
*height = 0;
/* 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");
return;
}
if (mix_pad->width <= 0) {
gint crop = mix_pad->crop_left + mix_pad->crop_right;
if (GST_VIDEO_INFO_WIDTH (&vagg_pad->info) > crop)
pad_width = GST_VIDEO_INFO_WIDTH (&vagg_pad->info) - crop;
else
pad_width = 0;
} else {
pad_width = mix_pad->width;
}
if (mix_pad->height <= 0) {
gint crop = mix_pad->crop_top + mix_pad->crop_bottom;
if (GST_VIDEO_INFO_HEIGHT (&vagg_pad->info) > crop)
pad_height = GST_VIDEO_INFO_HEIGHT (&vagg_pad->info) - crop;
else
pad_height = 0;
} else {
pad_height = mix_pad->height;
}
if (!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_WARNING_OBJECT (mix_pad, "Cannot calculate display aspect ratio");
*width = *height = 0;
return;
}
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);
switch (mix_pad->sizing_policy) {
case GST_GL_VIDEO_MIXER_SIZING_POLICY_NONE:
/* Pick either height or width, whichever is an integer multiple of the
* display aspect ratio. However, prefer preserving the height to account
* for interlaced video. */
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);
}
break;
case GST_GL_VIDEO_MIXER_SIZING_POLICY_KEEP_ASPECT_RATIO:
{
gint from_dar_n, from_dar_d, to_dar_n, to_dar_d, num, den;
/* Calculate DAR again with actual video size */
if (!gst_util_fraction_multiply (GST_VIDEO_INFO_WIDTH (&vagg_pad->info),
GST_VIDEO_INFO_HEIGHT (&vagg_pad->info),
GST_VIDEO_INFO_PAR_N (&vagg_pad->info),
GST_VIDEO_INFO_PAR_D (&vagg_pad->info), &from_dar_n,
&from_dar_d)) {
from_dar_n = from_dar_d = -1;
}
if (!gst_util_fraction_multiply (pad_width, pad_height,
out_par_n, out_par_d, &to_dar_n, &to_dar_d)) {
to_dar_n = to_dar_d = -1;
}
if (from_dar_n != to_dar_n || from_dar_d != to_dar_d) {
/* Calculate new output resolution */
if (from_dar_n != -1 && from_dar_d != -1
&& gst_util_fraction_multiply (from_dar_n, from_dar_d,
out_par_d, out_par_n, &num, &den)) {
GstVideoRectangle src_rect, dst_rect;
GstVideoRectangle rst_rect = { 0, 0, 0, 0 };
src_rect.h = gst_util_uint64_scale_int (pad_width, den, num);
if (src_rect.h == 0) {
pad_width = 0;
pad_height = 0;
break;
}
src_rect.x = src_rect.y = 0;
src_rect.w = pad_width;
dst_rect.x = dst_rect.y = 0;
dst_rect.w = pad_width;
dst_rect.h = pad_height;
/* Scale rect to be centered in destination rect */
align_rect (&src_rect, &dst_rect, &rst_rect, mix_pad->xalign,
mix_pad->yalign);
GST_LOG_OBJECT (mix_pad,
"Re-calculated size %dx%d -> %dx%d (x-offset %d, y-offset %d)",
pad_width, pad_height, rst_rect.w, rst_rect.h, rst_rect.x,
rst_rect.h);
*x_offset = rst_rect.x;
*y_offset = rst_rect.y;
pad_width = rst_rect.w;
pad_height = rst_rect.h;
} else {
GST_WARNING_OBJECT (mix_pad, "Failed to calculate output size");
*x_offset = 0;
*y_offset = 0;
pad_width = 0;
pad_height = 0;
}
}
break;
}
}
*width = pad_width;
*height = pad_height;
}
static GstCaps *
_update_caps (GstVideoAggregator * vagg, GstCaps * caps)
{
GstCaps *template_caps, *ret;
GList *l;
GST_OBJECT_LOCK (vagg);
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *vaggpad = l->data;
if (!vaggpad->info.finfo)
continue;
if (GST_VIDEO_INFO_FORMAT (&vaggpad->info) == GST_VIDEO_FORMAT_UNKNOWN)
continue;
if (GST_VIDEO_INFO_MULTIVIEW_MODE (&vaggpad->info) !=
GST_VIDEO_MULTIVIEW_MODE_NONE
&& GST_VIDEO_INFO_MULTIVIEW_MODE (&vaggpad->info) !=
GST_VIDEO_MULTIVIEW_MODE_MONO) {
GST_FIXME_OBJECT (vaggpad, "Multiview support is not implemented yet");
GST_OBJECT_UNLOCK (vagg);
return NULL;
}
}
GST_OBJECT_UNLOCK (vagg);
template_caps = gst_pad_get_pad_template_caps (GST_AGGREGATOR_SRC_PAD (vagg));
ret = gst_caps_intersect (caps, template_caps);
return ret;
}
static GstCaps *
_fixate_caps (GstAggregator * agg, GstCaps * caps)
{
GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR (agg);
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 offset_x, offset_y;
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,
&offset_x, &offset_y);
if (width == 0 || height == 0)
continue;
this_width = width + MAX (mixer_pad->xpos + offset_x, 0);
this_height = height + MAX (mixer_pad->ypos + offset_y, 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 (GstElement * agg, GstPad * 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_element_foreach_sink_pad (GST_ELEMENT (video_mixer), _reset_pad_gl, NULL);
}
static gboolean
is_point_contained (const GstVideoRectangle rect, const gint px, const gint py)
{
if ((px >= rect.x) && (px <= rect.x + rect.w) &&
(py >= rect.y) && (py <= rect.y + rect.h))
return TRUE;
return FALSE;
}
static gboolean
src_pad_mouse_event (GstElement * element, GstPad * pad, gpointer user_data)
{
GstGLVideoMixer *mix = GST_GL_VIDEO_MIXER (element);
GstGLVideoMixerPad *mix_pad = GST_GL_VIDEO_MIXER_PAD (pad);
GstCaps *caps = gst_pad_get_current_caps (pad);
GstStructure *event_st, *caps_st;
gint par_n = 1, par_d = 1;
gdouble event_x, event_y;
GstVideoRectangle rect;
event_st =
gst_structure_copy (gst_event_get_structure (GST_EVENT_CAST (user_data)));
caps_st = gst_structure_copy (gst_caps_get_structure (caps, 0));
gst_structure_get (event_st, "pointer_x", G_TYPE_DOUBLE, &event_x,
"pointer_y", G_TYPE_DOUBLE, &event_y, NULL);
/* Find output rectangle of this pad */
gst_structure_get_fraction (caps_st, "pixel-aspect-ratio", &par_n, &par_d);
_mixer_pad_get_output_size (mix, mix_pad, par_n, par_d, &(rect.w), &(rect.h),
&(rect.x), &(rect.y));
rect.x += mix_pad->xpos;
rect.y += mix_pad->ypos;
/* Translate coordinates and send event if it lies in this rectangle */
if (is_point_contained (rect, event_x, event_y)) {
GstVideoAggregatorPad *vpad = GST_VIDEO_AGGREGATOR_PAD_CAST (mix_pad);
gdouble w, h, x, y;
w = (gdouble) GST_VIDEO_INFO_WIDTH (&vpad->info);
h = (gdouble) GST_VIDEO_INFO_HEIGHT (&vpad->info);
x = (event_x - (gdouble) rect.x) * (w / (gdouble) rect.w);
y = (event_y - (gdouble) rect.y) * (h / (gdouble) rect.h);
gst_structure_set (event_st, "pointer_x", G_TYPE_DOUBLE, x,
"pointer_y", G_TYPE_DOUBLE, y, NULL);
gst_pad_push_event (pad, gst_event_new_navigation (event_st));
} else {
gst_structure_free (event_st);
}
gst_structure_free (caps_st);
return TRUE;
}
static gboolean
gst_gl_video_mixer_src_event (GstAggregator * agg, GstEvent * event)
{
GstNavigationEventType event_type;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
{
event_type = gst_navigation_event_get_type (event);
switch (event_type) {
case GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS:
case GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE:
case GST_NAVIGATION_EVENT_MOUSE_MOVE:
case GST_NAVIGATION_EVENT_MOUSE_SCROLL:
gst_element_foreach_sink_pad (GST_ELEMENT_CAST (agg),
src_pad_mouse_event, event);
gst_event_unref (event);
return FALSE;
default:
break;
}
}
default:
break;
}
return GST_AGGREGATOR_CLASS (parent_class)->src_event (agg, event);
}
static gboolean
gst_gl_video_mixer_set_caps (GstGLMixer * mixer, GstCaps * outcaps)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
/* need reconfigure output geometry */
video_mixer->output_geo_change = TRUE;
return TRUE;
}
static void
gst_gl_video_mixer_gl_stop (GstGLBaseMixer * base_mix)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (base_mix);
gst_clear_object (&video_mixer->shader);
gst_clear_object (&video_mixer->checker);
_reset_gl (base_mix->context, video_mixer);
GST_GL_BASE_MIXER_CLASS (parent_class)->gl_stop (base_mix);
}
static gboolean
gst_gl_video_mixer_gl_start (GstGLBaseMixer * base_mix)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (base_mix);
if (!video_mixer->shader) {
gchar *frag_str = g_strdup_printf ("%s%s",
gst_gl_shader_string_get_highest_precision (base_mix->context,
GST_GLSL_VERSION_NONE,
GST_GLSL_PROFILE_ES | GST_GLSL_PROFILE_COMPATIBILITY),
video_mixer_f_src);
gst_gl_context_gen_shader (base_mix->context,
gst_gl_shader_string_vertex_mat4_vertex_transform,
frag_str, &video_mixer->shader);
g_free (frag_str);
}
return GST_GL_BASE_MIXER_CLASS (parent_class)->gl_start (base_mix);
}
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, 0.0f,
1.0,-1.0, 0.0f,
1.0, 1.0, 0.0f,
-1.0, 1.0, 0.0f,
};
/* *INDENT-ON* */
if (!video_mixer->checker) {
gchar *frag_str;
frag_str =
g_strdup_printf ("%s%s",
gst_gl_shader_string_get_highest_precision (GST_GL_BASE_MIXER
(mixer)->context, GST_GLSL_VERSION_NONE,
GST_GLSL_PROFILE_ES | GST_GLSL_PROFILE_COMPATIBILITY),
checker_f_src);
if (!gst_gl_context_gen_shader (GST_GL_BASE_MIXER (mixer)->context,
checker_v_src, frag_str, &video_mixer->checker)) {
g_free (frag_str);
return FALSE;
}
g_free (frag_str);
}
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;
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 (video_mixer->output_geo_change
|| pad->geometry_change || !pad->vertex_buffer) {
gint pad_width, pad_height;
gint pad_offset_x, pad_offset_y;
gfloat w, h;
/* *INDENT-OFF* */
gfloat v_vertices[] = {
-1.0,-1.0, 0.0f, 0.0f, 0.0f,
1.0,-1.0, 0.0f, 1.0f, 0.0f,
1.0, 1.0, 0.0f, 1.0f, 1.0f,
-1.0, 1.0, 0.0f, 0.0f, 1.0f,
};
/* *INDENT-ON* */
_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, &pad_offset_x, &pad_offset_y);
w = ((gfloat) pad_width / (gfloat) out_width);
h = ((gfloat) pad_height / (gfloat) out_height);
pad->m_matrix[0] = w;
pad->m_matrix[5] = h;
pad->m_matrix[12] =
2. * (gfloat) (pad->xpos + pad_offset_x) / (gfloat) out_width - (1. -
w);
pad->m_matrix[13] =
2. * (gfloat) (pad->ypos + pad_offset_y) / (gfloat) out_height - (1. -
h);
v_vertices[0 * 5 + 3] = v_vertices[3 * 5 + 3] =
pad->crop_left ? ((gfloat) pad->crop_left) /
((gfloat) in_width) : 0.0f;
v_vertices[1 * 5 + 3] = v_vertices[2 * 5 + 3] =
pad->crop_right ? 1.0 -
((gfloat) pad->crop_right) / ((gfloat) in_width) : 1.0f;
v_vertices[0 * 5 + 4] = v_vertices[1 * 5 + 4] =
pad->crop_top ? ((gfloat) pad->crop_top) /
((gfloat) in_height) : 0.0f;
v_vertices[2 * 5 + 4] = v_vertices[3 * 5 + 4] =
pad->crop_bottom ? 1.0 -
((gfloat) pad->crop_bottom) / ((gfloat) in_height) : 1.0f;
GST_TRACE ("processing texture:%u dimensions:%ux%u with texture "
"coordinates %f:%fx%f:%f, at %f,%f %fx%f with alpha:%f "
"and crop: %d:%dx%d:%d", in_tex, in_width, in_height,
v_vertices[0 * 5 + 3], v_vertices[1 * 5 + 3], v_vertices[0 * 5 + 4],
v_vertices[1 * 5 + 4], pad->m_matrix[12], pad->m_matrix[13],
pad->m_matrix[0], pad->m_matrix[5], pad->alpha, pad->crop_left,
pad->crop_right, pad->crop_top, pad->crop_bottom);
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];
gfloat af_matrix[16];
GstBuffer *buffer =
gst_video_aggregator_pad_get_current_buffer (vagg_pad);
af_meta = gst_buffer_get_video_affine_transformation_meta (buffer);
gst_gl_get_affine_transformation_meta_as_ndc (af_meta, af_matrix);
gst_gl_multiply_matrix4 (af_matrix, pad->m_matrix, 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);
}
video_mixer->output_geo_change = FALSE;
GST_OBJECT_UNLOCK (video_mixer);
if (gl->GenVertexArrays) {
gl->BindVertexArray (0);
} else {
gl->DisableVertexAttribArray (attr_position_loc);
gl->DisableVertexAttribArray (attr_texture_loc);
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;
}
/* GstChildProxy implementation */
static GObject *
gst_gl_video_mixer_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
guint index)
{
GstGLVideoMixer *gl_video_mixer = GST_GL_VIDEO_MIXER (child_proxy);
GObject *obj = NULL;
GST_OBJECT_LOCK (gl_video_mixer);
obj = g_list_nth_data (GST_ELEMENT_CAST (gl_video_mixer)->sinkpads, index);
if (obj)
gst_object_ref (obj);
GST_OBJECT_UNLOCK (gl_video_mixer);
return obj;
}
static guint
gst_gl_video_mixer_child_proxy_get_children_count (GstChildProxy * child_proxy)
{
guint count = 0;
GstGLVideoMixer *gl_video_mixer = GST_GL_VIDEO_MIXER (child_proxy);
GST_OBJECT_LOCK (gl_video_mixer);
count = GST_ELEMENT_CAST (gl_video_mixer)->numsinkpads;
GST_OBJECT_UNLOCK (gl_video_mixer);
GST_INFO_OBJECT (gl_video_mixer, "Children Count: %d", count);
return count;
}
static void
gst_gl_video_mixer_child_proxy_init (gpointer g_iface, gpointer iface_data)
{
GstChildProxyInterface *iface = g_iface;
iface->get_child_by_index = gst_gl_video_mixer_child_proxy_get_child_by_index;
iface->get_children_count = gst_gl_video_mixer_child_proxy_get_children_count;
}
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