--- /dev/null
+/* GStreamer
+ * Copyright (C) 2018 Matthew Waters <matthew@centricular.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.
+ */
+/*
+ * This file was modified from the alpha element and converted to OpenGL
+ */
+
+/**
+ * SECTION:element-glalpha
+ * @title: glalpha
+ *
+ * The glalpha element adds an alpha channel to a video stream. The values
+ * of the alpha channel can be either be set to a constant or can be
+ * dynamically calculated via chroma keying, e.g. blue can be set as
+ * the transparent color.
+ *
+ * Sample pipeline:
+ * |[
+ * gst-launch-1.0 gltestsrc pattern=snow ! mixer.sink_0 \
+ * gltestsrc pattern=smpte ! glalpha method=green ! mixer.sink_1 \
+ * glvideomixer name=mixer sink_0::zorder=0 sink_1::zorder=1 ! \
+ * glimagesink
+ * ]| This pipeline adds a alpha channel to the SMPTE color bars
+ * with green as the transparent color and overlays the output on
+ * top of a snow video stream.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstglalpha.h"
+#include <string.h>
+#include <math.h>
+#include <gst/gl/gstglfuncs.h>
+
+GST_DEBUG_CATEGORY_STATIC (glalpha_debug);
+#define GST_CAT_DEFAULT glalpha_debug
+
+#define GST_TYPE_GL_ALPHA_METHOD (gst_gl_alpha_method_get_type())
+static GType
+gst_gl_alpha_method_get_type (void)
+{
+ static GType alpha_method_type = 0;
+ static const GEnumValue alpha_method[] = {
+ {ALPHA_METHOD_SET, "Set/adjust alpha channel", "set"},
+ {ALPHA_METHOD_GREEN, "Chroma Key on pure green", "green"},
+ {ALPHA_METHOD_BLUE, "Chroma Key on pure blue", "blue"},
+ {ALPHA_METHOD_CUSTOM, "Chroma Key on custom RGB values", "custom"},
+ {0, NULL, NULL},
+ };
+
+ if (!alpha_method_type) {
+ alpha_method_type =
+ g_enum_register_static ("GstGLAlphaMethod", alpha_method);
+ }
+ return alpha_method_type;
+}
+
+/* GstGLAlpha properties */
+#define DEFAULT_METHOD ALPHA_METHOD_SET
+#define DEFAULT_ALPHA 1.0
+#define DEFAULT_TARGET_R 0
+#define DEFAULT_TARGET_G 255
+#define DEFAULT_TARGET_B 0
+#define DEFAULT_ANGLE 20.0
+#define DEFAULT_NOISE_LEVEL 2.0
+#define DEFAULT_BLACK_SENSITIVITY 100
+#define DEFAULT_WHITE_SENSITIVITY 100
+
+enum
+{
+ PROP_0,
+ PROP_METHOD,
+ PROP_ALPHA,
+ PROP_TARGET_R,
+ PROP_TARGET_G,
+ PROP_TARGET_B,
+ PROP_ANGLE,
+ PROP_NOISE_LEVEL,
+ PROP_BLACK_SENSITIVITY,
+ PROP_WHITE_SENSITIVITY,
+};
+
+/* *INDENT-OFF* */
+static const gchar *alpha_frag =
+ "#ifdef GL_ES\n"
+ "precision mediump float;\n"
+ "#endif\n"
+ "varying vec2 v_texcoord;\n"
+ "uniform sampler2D tex;\n"
+ "uniform float alpha;\n"
+ "void main () {\n"
+ " vec4 rgba = texture2D (tex, v_texcoord);\n"
+ " rgba.a = alpha;\n"
+ " gl_FragColor = rgba;\n"
+ "}\n";
+
+static const gchar *chroma_key_frag =
+ "#ifdef GL_ES\n"
+ "precision mediump float;\n"
+ "#endif\n"
+ "varying vec2 v_texcoord;\n"
+ "uniform sampler2D tex;\n"
+ "uniform float cb;\n"
+ "uniform float cr;\n"
+ "uniform float kg;\n"
+ "uniform float accept_angle_tg;\n"
+ "uniform float accept_angle_ctg;\n"
+ "uniform float one_over_kc;\n"
+ "uniform float kfgy_scale;\n"
+ "uniform float noise_level2;\n"
+ "uniform float smin;\n"
+ "uniform float smax;\n"
+ /* these values are taken from the alpha element and divided by 256 to
+ * get the floating point numbers below.
+ * XXX: They are different from the values produced by videoconvert and used
+ * by glcolorconvert
+ 298, 0, 409, -57068,
+ 298, -100, -208, 34707,
+ 298, 516, 0, -70870,
+ */
+ "#define from_yuv_bt601_offset vec3(-0.0625, -0.5, -0.5)\n"
+ "#define from_yuv_bt601_rcoeff vec3(1.1640625, 0.000, 1.787)\n"
+ "#define from_yuv_bt601_gcoeff vec3(1.1640625,-0.213,-0.531)\n"
+ "#define from_yuv_bt601_bcoeff vec3(1.1640625, 2.112, 0.000)\n"
+ /* these values are taken from the alpha element and divided by 256 to
+ * get the floating point numbers below
+ * XXX: They are different from the values produced by videoconvert and used
+ * by glcolorconvert
+ 66, 129, 25, 4096,
+ -38, -74, 112, 32768,
+ 112, -94, -18, 32768,
+ */
+ "#define from_rgb_bt601_offset vec3(0.0625, 0.5, 0.5)\n"
+ "#define from_rgb_bt601_ycoeff vec3( 0.2578125, 0.50390625, 0.09765625)\n"
+ "#define from_rgb_bt601_ucoeff vec3(-0.1484375,-0.28906250, 0.43750000)\n"
+ "#define from_rgb_bt601_vcoeff vec3( 0.4375000,-0.36718750,-0.07031250)\n"
+ "#define PI 3.14159265\n"
+ "\n"
+ "vec3 yuv_to_rgb (vec3 val) {\n"
+ " vec3 rgb;\n"
+ " val += from_yuv_bt601_offset;\n"
+ " rgb.r = dot(val, from_yuv_bt601_rcoeff);\n"
+ " rgb.g = dot(val, from_yuv_bt601_gcoeff);\n"
+ " rgb.b = dot(val, from_yuv_bt601_bcoeff);\n"
+ " return rgb;\n"
+ "}\n"
+ "vec3 rgb_to_yuv (vec3 val) {\n"
+ " vec3 yuv;\n"
+ " yuv.r = dot(val.rgb, from_rgb_bt601_ycoeff);\n"
+ " yuv.g = dot(val.rgb, from_rgb_bt601_ucoeff);\n"
+ " yuv.b = dot(val.rgb, from_rgb_bt601_vcoeff);\n"
+ " yuv += from_rgb_bt601_offset;\n"
+ " return yuv;\n"
+ "}\n"
+ "vec4 chroma_keying_yuv (vec4 yuva) {\n"
+ " float y, u, v;\n"
+ " y = yuva.x;\n"
+ " u = yuva.y-0.5;\n"
+ " v = yuva.z-0.5;\n"
+ " if (y < smin || y > smax) {\n"
+ " return yuva;\n"
+ " }\n"
+ " vec4 new;\n"
+ " float tmp, tmp1;\n"
+ " float x = clamp ((u * cb + v * cr) * 2.0, -0.5, 0.5);\n"
+ " float z = clamp ((v * cb - u * cr) * 2.0, -0.5, 0.5);\n"
+ " if (abs(z) > min (0.5, x * accept_angle_tg * 0.0625)) {\n"
+ " return yuva;\n"
+ " }\n"
+ " float x1 = min (0.5, abs(z * accept_angle_ctg * 0.0625));\n"
+ " float y1 = z;\n"
+ " tmp1 = max (0.0, x-x1);\n"
+ " float b_alpha = yuva.a * (1.0 - clamp (tmp1 * one_over_kc, 0.0, 1.0));\n"
+ " tmp = min (1.0, tmp1 * kfgy_scale * 0.0625);\n"
+ " new.x = max (y-tmp, 0.0);//y < tmp ? 0.0 : y - tmp;\n"
+ " new.y = clamp ((x1 * cb - y1 * cr) * 2.0, -0.5, 0.5)+0.5;\n"
+ " new.z = clamp ((y1 * cb + x1 * cr) * 2.0, -0.5, 0.5)+0.5;\n"
+ " new.a = z * z + (x - kg) * (x - kg) < noise_level2 ? 0.0 : b_alpha;\n"
+ " return new;\n"
+ "}\n"
+ "void main () {\n"
+ " vec4 yuva;\n"
+ /* operations translated from alpha and tested with glvideomixer
+ * with one pad's paremeters blend-equation-rgb={subtract,reverse-subtract},
+ * blend-function-src-rgb=src-color and blend-function-dst-rgb=dst-color */
+ " vec4 rgba = texture2D (tex, v_texcoord);\n"
+ " yuva.xyz = rgb_to_yuv (rgba.rgb);\n"
+ " yuva.a = rgba.a;\n"
+ " yuva = chroma_keying_yuv (yuva);\n"
+ " rgba.rgb = yuv_to_rgb (yuva.xyz);\n"
+ " rgba.a = yuva.a;\n"
+ " gl_FragColor = rgba;\n"
+ "}\n";
+/* *INDENT-ON* */
+
+static const gfloat cog_rgb_to_ycbcr_matrix_8bit_sdtv[] = {
+ 0.2578125, 0.50390625, 0.09765625, 0.0625f,
+ -0.1484375, -0.28906250, 0.43750000, 0.5f,
+ 0.4375000, -0.36718750, -0.07031250, 0.5f
+};
+
+static void gst_gl_alpha_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec);
+static void gst_gl_alpha_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec);
+
+#define gst_gl_alpha_parent_class parent_class
+G_DEFINE_TYPE (GstGLAlpha, gst_gl_alpha, GST_TYPE_GL_FILTER);
+
+static gboolean
+gst_gl_alpha_is_passthrough (GstGLAlpha * glalpha)
+{
+ return glalpha->method == ALPHA_METHOD_SET && glalpha->alpha == 1.0;
+}
+
+/* move v to be inside [from, to] by some multiple of (to-from) */
+static float
+wrap (float v, float from, float to)
+{
+ float diff;
+
+ if (from > to) {
+ float t = to;
+ to = from;
+ from = t;
+ }
+
+ if (!isfinite (to) || !isfinite (from) || !isfinite (v))
+ return v;
+
+ diff = to - from;
+
+ while (v < from)
+ v += diff;
+ while (v > to)
+ v -= diff;
+
+ return v;
+}
+
+static void
+gst_gl_alpha_update_properties (GstGLAlpha * glalpha)
+{
+ GstBaseTransform *base = GST_BASE_TRANSFORM (glalpha);
+ gboolean current_passthrough, passthrough;
+ gfloat kgl;
+ gfloat tmp;
+ gfloat target_r, target_g, target_b;
+ gfloat target_y, target_u, target_v;
+ const float *matrix = cog_rgb_to_ycbcr_matrix_8bit_sdtv;
+
+ GST_OBJECT_LOCK (glalpha);
+ switch (glalpha->method) {
+ case ALPHA_METHOD_GREEN:
+ target_r = 0.0;
+ target_g = 1.0;
+ target_b = 0.0;
+ break;
+ case ALPHA_METHOD_BLUE:
+ target_r = 0.0;
+ target_g = 0.0;
+ target_b = 1.0;
+ break;
+ default:
+ target_r = (gfloat) glalpha->target_r / 255.0;
+ target_g = (gfloat) glalpha->target_g / 255.0;
+ target_b = (gfloat) glalpha->target_b / 255.0;
+ break;
+ }
+
+ target_y =
+ matrix[0] * target_r + matrix[1] * target_g + matrix[2] * target_b +
+ matrix[3];
+ /* Cb,Cr without offset here because the chroma keying
+ * works with them being in range [-128,127]
+ */
+ target_u = matrix[4] * target_r + matrix[5] * target_g + matrix[6] * target_b;
+ target_v =
+ matrix[8] * target_r + matrix[9] * target_g + matrix[10] * target_b;
+
+ tmp = target_u * target_u + target_v * target_v;
+ kgl = sqrt (tmp);
+ glalpha->cb = target_u / kgl * 0.5;
+ glalpha->cr = target_v / kgl * 0.5;
+
+ tmp = 15 * tan (M_PI * glalpha->angle / 180);
+ tmp = MIN (tmp, 255);
+ glalpha->accept_angle_tg = tmp;
+ tmp = 15 / tan (M_PI * glalpha->angle / 180);
+ tmp = MIN (tmp, 255);
+ glalpha->accept_angle_ctg = tmp;
+ glalpha->one_over_kc = wrap (2 / kgl - 255, 0, 256);
+ tmp = 15 * target_y / kgl;
+ tmp = MIN (tmp, 255);
+ glalpha->kfgy_scale = tmp;
+ glalpha->kg = MIN (kgl, 0.5);
+
+ glalpha->noise_level2 =
+ glalpha->noise_level / 256.0 * glalpha->noise_level / 256.0;
+
+ GST_INFO_OBJECT (glalpha, "target yuv: %f, %f, %f, "
+ "kgl: %f, cb: %f, cr: %f, accept_angle_tg: %f, accept_angle_ctg: %f, "
+ "one_over_kc: %f, kgfy_scale: %f, kg: %f, noise level: %f",
+ (float) target_y, (float) target_u, (float) target_v, (float) kgl,
+ (float) glalpha->cb, (float) glalpha->cr,
+ (float) glalpha->accept_angle_tg, (float) glalpha->accept_angle_ctg,
+ (float) glalpha->one_over_kc, (float) glalpha->kfgy_scale,
+ (float) glalpha->kg, (float) glalpha->noise_level2);
+
+ passthrough = gst_gl_alpha_is_passthrough (glalpha);
+ GST_OBJECT_UNLOCK (glalpha);
+ current_passthrough = gst_base_transform_is_passthrough (base);
+
+ gst_base_transform_set_passthrough (base, passthrough);
+ if (current_passthrough != passthrough)
+ gst_base_transform_reconfigure_src (base);
+}
+
+static gboolean
+_create_shader (GstGLAlpha * alpha)
+{
+ GstGLBaseFilter *base_filter = GST_GL_BASE_FILTER (alpha);
+ GstGLFilter *filter = GST_GL_FILTER (alpha);
+ GError *error = NULL;
+
+ if (alpha->alpha_shader)
+ gst_object_unref (alpha->alpha_shader);
+
+ if (!(alpha->alpha_shader =
+ gst_gl_shader_new_link_with_stages (base_filter->context, &error,
+ gst_glsl_stage_new_default_vertex (base_filter->context),
+ gst_glsl_stage_new_with_string (base_filter->context,
+ GL_FRAGMENT_SHADER, GST_GLSL_VERSION_NONE,
+ GST_GLSL_PROFILE_ES | GST_GLSL_PROFILE_COMPATIBILITY,
+ alpha_frag), NULL))) {
+ GST_ELEMENT_ERROR (alpha, RESOURCE, NOT_FOUND, ("%s",
+ "Failed to initialize alpha shader"), ("%s",
+ error ? error->message : "Unknown error"));
+ return FALSE;
+ }
+
+ if (alpha->chroma_key_shader)
+ gst_object_unref (alpha->chroma_key_shader);
+
+ if (!(alpha->chroma_key_shader =
+ gst_gl_shader_new_link_with_stages (base_filter->context, &error,
+ gst_glsl_stage_new_default_vertex (base_filter->context),
+ gst_glsl_stage_new_with_string (base_filter->context,
+ GL_FRAGMENT_SHADER, GST_GLSL_VERSION_NONE,
+ GST_GLSL_PROFILE_ES | GST_GLSL_PROFILE_COMPATIBILITY,
+ chroma_key_frag), NULL))) {
+ GST_ELEMENT_ERROR (alpha, RESOURCE, NOT_FOUND, ("%s",
+ "Failed to initialize chroma key shader"), ("%s",
+ error ? error->message : "Unknown error"));
+ return FALSE;
+ }
+
+ filter->draw_attr_position_loc =
+ gst_gl_shader_get_attribute_location (alpha->alpha_shader, "a_position");
+ filter->draw_attr_texture_loc =
+ gst_gl_shader_get_attribute_location (alpha->alpha_shader, "a_texcoord");
+
+ return TRUE;
+}
+
+static gboolean
+gst_gl_alpha_gl_start (GstGLBaseFilter * base_filter)
+{
+ GstGLAlpha *alpha = GST_GL_ALPHA (base_filter);
+
+ if (!_create_shader (alpha))
+ return FALSE;
+
+ return GST_GL_BASE_FILTER_CLASS (parent_class)->gl_start (base_filter);
+}
+
+static void
+gst_gl_alpha_gl_stop (GstGLBaseFilter * base_filter)
+{
+ GstGLAlpha *alpha = GST_GL_ALPHA (base_filter);
+
+ if (alpha->alpha_shader)
+ gst_object_unref (alpha->alpha_shader);
+ alpha->alpha_shader = NULL;
+
+ if (alpha->chroma_key_shader)
+ gst_object_unref (alpha->chroma_key_shader);
+ alpha->chroma_key_shader = NULL;
+
+ GST_GL_BASE_FILTER_CLASS (parent_class)->gl_stop (base_filter);
+}
+
+static void
+gst_gl_alpha_before_transform (GstBaseTransform * base, GstBuffer * buf)
+{
+ GstGLAlpha *alpha = GST_GL_ALPHA (base);
+ GstClockTime timestamp, stream_time;
+
+ timestamp = GST_BUFFER_TIMESTAMP (buf);
+ stream_time =
+ gst_segment_to_stream_time (&base->segment, GST_FORMAT_TIME, timestamp);
+
+ GST_DEBUG_OBJECT (alpha, "sync to %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (timestamp));
+
+ if (GST_CLOCK_TIME_IS_VALID (stream_time))
+ gst_object_sync_values (GST_OBJECT (alpha), stream_time);
+}
+
+static gboolean
+gst_gl_alpha_filter_texture (GstGLFilter * filter, GstGLMemory * in_tex,
+ GstGLMemory * out_tex)
+{
+ GstGLAlpha *alpha = GST_GL_ALPHA (filter);
+ GstGLShader *shader;
+
+ if (!alpha->alpha_shader)
+ _create_shader (alpha);
+
+ GST_OBJECT_LOCK (alpha);
+ if (alpha->method == ALPHA_METHOD_SET) {
+ shader = alpha->alpha_shader;
+ gst_gl_shader_use (shader);
+ gst_gl_shader_set_uniform_1f (shader, "alpha", alpha->alpha);
+ } else {
+ shader = alpha->chroma_key_shader;
+ gst_gl_shader_use (shader);
+
+ gst_gl_shader_set_uniform_1f (shader, "cb", alpha->cb);
+ gst_gl_shader_set_uniform_1f (shader, "cr", alpha->cr);
+ gst_gl_shader_set_uniform_1f (shader, "kg", alpha->kg);
+ gst_gl_shader_set_uniform_1f (shader, "accept_angle_tg",
+ alpha->accept_angle_tg);
+ gst_gl_shader_set_uniform_1f (shader, "accept_angle_ctg",
+ alpha->accept_angle_ctg);
+ gst_gl_shader_set_uniform_1f (shader, "one_over_kc", alpha->one_over_kc);
+ gst_gl_shader_set_uniform_1f (shader, "kfgy_scale", alpha->kfgy_scale);
+ gst_gl_shader_set_uniform_1f (shader, "noise_level2", alpha->noise_level2);
+ gst_gl_shader_set_uniform_1f (shader, "smin",
+ 0.5 - alpha->black_sensitivity / 255.0);
+ gst_gl_shader_set_uniform_1f (shader, "smax",
+ 0.5 + alpha->white_sensitivity / 255.0);
+ }
+ GST_OBJECT_UNLOCK (alpha);
+
+ gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex, shader);
+
+ return TRUE;
+}
+
+static void
+gst_gl_alpha_class_init (GstGLAlphaClass * klass)
+{
+ GObjectClass *gobject_class = (GObjectClass *) klass;
+ GstElementClass *gstelement_class = (GstElementClass *) klass;
+ GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
+ GstGLBaseFilterClass *base_filter_class = (GstGLBaseFilterClass *) klass;
+ GstGLFilterClass *filter_class = (GstGLFilterClass *) klass;
+
+ GST_DEBUG_CATEGORY_INIT (glalpha_debug, "glalpha", 0, "glalpha");
+
+ gst_gl_filter_add_rgba_pad_templates (GST_GL_FILTER_CLASS (klass));
+
+ gobject_class->set_property = gst_gl_alpha_set_property;
+ gobject_class->get_property = gst_gl_alpha_get_property;
+
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_METHOD,
+ g_param_spec_enum ("method", "Method",
+ "How the alpha channels should be created", GST_TYPE_GL_ALPHA_METHOD,
+ DEFAULT_METHOD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ALPHA,
+ g_param_spec_double ("alpha", "Alpha", "The value for the alpha channel",
+ 0.0, 1.0, DEFAULT_ALPHA,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_R,
+ g_param_spec_uint ("target-r", "Target Red",
+ "The red color value for custom RGB chroma keying", 0, 255,
+ DEFAULT_TARGET_R,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_G,
+ g_param_spec_uint ("target-g", "Target Green",
+ "The green color value for custom RGB chroma keying", 0, 255,
+ DEFAULT_TARGET_G,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_B,
+ g_param_spec_uint ("target-b", "Target Blue",
+ "The blue color value for custom RGB chroma keying", 0, 255,
+ DEFAULT_TARGET_B,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ANGLE,
+ g_param_spec_float ("angle", "Angle", "Size of the colorcube to change",
+ 0.0, 90.0, DEFAULT_ANGLE,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_NOISE_LEVEL,
+ g_param_spec_float ("noise-level", "Noise Level", "Size of noise radius",
+ 0.0, 64.0, DEFAULT_NOISE_LEVEL,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass),
+ PROP_BLACK_SENSITIVITY, g_param_spec_uint ("black-sensitivity",
+ "Black Sensitivity", "Sensitivity to dark colors", 0, 128,
+ DEFAULT_BLACK_SENSITIVITY,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass),
+ PROP_WHITE_SENSITIVITY, g_param_spec_uint ("white-sensitivity",
+ "White Sensitivity", "Sensitivity to bright colors", 0, 128,
+ DEFAULT_WHITE_SENSITIVITY,
+ G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+
+ gst_element_class_set_static_metadata (gstelement_class,
+ "OpenGL Alpha Filter", "Filter/Effect/Video",
+ "Adds an alpha channel to video using OpenGL - uniform or chroma-keying",
+ "Matthew Waters <matthew@centricular.com>");
+
+ trans_class->before_transform =
+ GST_DEBUG_FUNCPTR (gst_gl_alpha_before_transform);
+ trans_class->transform_ip_on_passthrough = FALSE;
+
+ base_filter_class->gl_start = GST_DEBUG_FUNCPTR (gst_gl_alpha_gl_start);
+ base_filter_class->gl_stop = GST_DEBUG_FUNCPTR (gst_gl_alpha_gl_stop);
+
+ filter_class->filter_texture =
+ GST_DEBUG_FUNCPTR (gst_gl_alpha_filter_texture);
+}
+
+static void
+gst_gl_alpha_init (GstGLAlpha * alpha)
+{
+ alpha->alpha = DEFAULT_ALPHA;
+ alpha->method = DEFAULT_METHOD;
+ alpha->target_r = DEFAULT_TARGET_R;
+ alpha->target_g = DEFAULT_TARGET_G;
+ alpha->target_b = DEFAULT_TARGET_B;
+ alpha->angle = DEFAULT_ANGLE;
+ alpha->noise_level = DEFAULT_NOISE_LEVEL;
+ alpha->black_sensitivity = DEFAULT_BLACK_SENSITIVITY;
+ alpha->white_sensitivity = DEFAULT_WHITE_SENSITIVITY;
+
+ gst_gl_alpha_update_properties (alpha);
+}
+
+static void
+gst_gl_alpha_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstGLAlpha *alpha = GST_GL_ALPHA (object);
+
+ GST_OBJECT_LOCK (alpha);
+ switch (prop_id) {
+ case PROP_METHOD:{
+ alpha->method = g_value_get_enum (value);
+ break;
+ }
+ case PROP_ALPHA:{
+ alpha->alpha = g_value_get_double (value);
+ break;
+ }
+ case PROP_TARGET_R:
+ alpha->target_r = g_value_get_uint (value);
+ break;
+ case PROP_TARGET_G:
+ alpha->target_g = g_value_get_uint (value);
+ break;
+ case PROP_TARGET_B:
+ alpha->target_b = g_value_get_uint (value);
+ break;
+ case PROP_ANGLE:
+ alpha->angle = g_value_get_float (value);
+ break;
+ case PROP_NOISE_LEVEL:
+ alpha->noise_level = g_value_get_float (value);
+ break;
+ case PROP_BLACK_SENSITIVITY:
+ alpha->black_sensitivity = g_value_get_uint (value);
+ break;
+ case PROP_WHITE_SENSITIVITY:
+ alpha->white_sensitivity = g_value_get_uint (value);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+ GST_OBJECT_UNLOCK (alpha);
+ gst_gl_alpha_update_properties (alpha);
+}
+
+static void
+gst_gl_alpha_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstGLAlpha *alpha = GST_GL_ALPHA (object);
+
+ switch (prop_id) {
+ case PROP_METHOD:
+ g_value_set_enum (value, alpha->method);
+ break;
+ case PROP_ALPHA:
+ g_value_set_double (value, alpha->alpha);
+ break;
+ case PROP_TARGET_R:
+ g_value_set_uint (value, alpha->target_r);
+ break;
+ case PROP_TARGET_G:
+ g_value_set_uint (value, alpha->target_g);
+ break;
+ case PROP_TARGET_B:
+ g_value_set_uint (value, alpha->target_b);
+ break;
+ case PROP_ANGLE:
+ g_value_set_float (value, alpha->angle);
+ break;
+ case PROP_NOISE_LEVEL:
+ g_value_set_float (value, alpha->noise_level);
+ break;
+ case PROP_BLACK_SENSITIVITY:
+ g_value_set_uint (value, alpha->black_sensitivity);
+ break;
+ case PROP_WHITE_SENSITIVITY:
+ g_value_set_uint (value, alpha->white_sensitivity);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
projects / platform / upstream / gstreamer.git / commitdiff