[830/906] glvideomixer: Add a new simple glvideomixer element

that simply uses glBlendFunc to blend each imput frame

https://bugzilla.gnome.org/show_bug.cgi?id=710714

4 files changed, 363 insertions, 0 deletions

diff --git a/gst/gl/Makefile.am b/gst/gl/Makefile.am
index 2c2b53701..c7a59b648 100644
--- a/gst/gl/Makefile.am
+++ b/gst/gl/Makefile.am
@@ -31,6 +31,8 @@ OPENGL_SOURCES =  \
 	gstgltestsrc.h \
 	gstglmosaic.c \
 	gstglmosaic.h \
+	gstglvideomixer.c \
+	gstglvideomixer.h \
 	effects/gstgleffectscurves.h \
 	effects/gstgleffectstretch.c \
 	effects/gstgleffecttunnel.c \
diff --git a/gst/gl/gstglvideomixer.c b/gst/gl/gstglvideomixer.c
new file mode 100644
index 000000000..0275d67d3
--- /dev/null
+++ b/gst/gl/gstglvideomixer.c
@@ -0,0 +1,299 @@
+/*
+ * 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
+ *
+ * glmixer sub element. N gl sink pads to 1 source pad.
+ * N + 1 OpenGL contexts shared together.
+ * N <= 6 because the rendering is more a like a cube than a video_mixer
+ * Each opengl input stream is rendered on a cube face
+ *
+ * <refsect2>
+ * <title>Examples</title>
+ * |[
+ * gst-launch-0.10 videotestsrc ! "video/x-raw-yuv, format=(fourcc)YUY2" ! glupload ! queue ! glvideomixer name=m ! glimagesink videotestsrc pattern=12 ! "video/x-raw-yuv, format=(fourcc)I420, framerate=(fraction)5/1, width=100, height=200" ! glupload ! queue ! m. videotestsrc ! "video/x-raw-rgb, framerate=(fraction)15/1, width=1500, height=1500" ! glupload ! gleffects effect=3 ! queue ! m. videotestsrc ! glupload ! gleffects effect=2 ! queue ! m.  videotestsrc ! glupload ! glfiltercube ! queue ! m. videotestsrc ! glupload ! gleffects effect=6 ! queue ! m.
+ * ]|
+ * FBO (Frame Buffer Object) is required.
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstglvideomixer.h"
+
+#define GST_CAT_DEFAULT gst_gl_video_mixer_debug
+GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+
+enum
+{
+  PROP_0,
+};
+
+#define DEBUG_INIT \
+    GST_DEBUG_CATEGORY_INIT (gst_gl_video_mixer_debug, "glvideomixer", 0, "glvideomixer element");
+
+G_DEFINE_TYPE_WITH_CODE (GstGLVideoMixer, gst_gl_video_mixer, GST_TYPE_GL_MIXER,
+    DEBUG_INIT);
+
+static void gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static void gst_gl_video_mixer_reset (GstGLMixer * mixer);
+static gboolean gst_gl_video_mixer_init_shader (GstGLMixer * mixer,
+    GstCaps * outcaps);
+
+static gboolean gst_gl_video_mixer_process_textures (GstGLMixer * mixer,
+    GArray * in_textures, GPtrArray * in_frames, guint out_tex);
+static void gst_gl_video_mixer_callback (gpointer stuff);
+
+/* vertex source */
+static const gchar *video_mixer_v_src =
+    "#extension GL_ARB_texture_rectangle : enable\n"
+    "attribute vec4 a_position;                                   \n"
+    "attribute vec2 a_texCoord;                                   \n"
+    "uniform float x_scale;                                       \n"
+    "uniform float y_scale;                                       \n"
+    "varying vec2 v_texCoord;                                     \n"
+    "void main()                                                  \n"
+    "{                                                            \n"
+    "   gl_Position = a_position * vec4(x_scale, y_scale, 1.0, 1.0);\n"
+    "   v_texCoord = a_texCoord;                                  \n" "}";
+
+/* fragment source */
+static const gchar *video_mixer_f_src =
+    "#extension GL_ARB_texture_rectangle : enable\n"
+    "uniform sampler2DRect texture;                     \n"
+    "varying vec2 v_texCoord;                            \n"
+    "void main()                                         \n"
+    "{                                                   \n"
+    "  vec4 rgba = texture2DRect( texture, v_texCoord );\n"
+    "  gl_FragColor = vec4(rgba.rgb, 1.0);\n"
+    "}                                                   \n";
+
+static void
+gst_gl_video_mixer_class_init (GstGLVideoMixerClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *element_class;
+
+  gobject_class = (GObjectClass *) klass;
+  element_class = GST_ELEMENT_CLASS (klass);
+
+  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", "OpenGL video_mixer",
+      "Julien Isorce <julien.isorce@gmail.com>");
+
+  GST_GL_MIXER_CLASS (klass)->set_caps = gst_gl_video_mixer_init_shader;
+  GST_GL_MIXER_CLASS (klass)->reset = gst_gl_video_mixer_reset;
+  GST_GL_MIXER_CLASS (klass)->process_textures =
+      gst_gl_video_mixer_process_textures;
+}
+
+static void
+gst_gl_video_mixer_init (GstGLVideoMixer * video_mixer)
+{
+  video_mixer->shader = NULL;
+  video_mixer->input_textures = NULL;
+  video_mixer->input_frames = NULL;
+}
+
+static void
+gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  switch (prop_id) {
+    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)
+{
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_gl_video_mixer_reset (GstGLMixer * mixer)
+{
+  GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
+
+  video_mixer->input_textures = NULL;
+  video_mixer->input_frames = NULL;
+
+  if (video_mixer->shader)
+    gst_gl_context_del_shader (mixer->context, video_mixer->shader);
+  video_mixer->shader = NULL;
+}
+
+static gboolean
+gst_gl_video_mixer_init_shader (GstGLMixer * mixer, GstCaps * outcaps)
+{
+  GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
+
+  return gst_gl_context_gen_shader (mixer->context, video_mixer_v_src,
+      video_mixer_f_src, &video_mixer->shader);
+}
+
+static gboolean
+gst_gl_video_mixer_process_textures (GstGLMixer * mix, GArray * in_textures,
+    GPtrArray * in_frames, guint out_tex)
+{
+  GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mix);
+
+  video_mixer->input_textures = in_textures;
+  video_mixer->input_frames = in_frames;
+
+  gst_gl_context_use_fbo_v2 (mix->context,
+      GST_VIDEO_INFO_WIDTH (&mix->out_info),
+      GST_VIDEO_INFO_HEIGHT (&mix->out_info), mix->fbo, mix->depthbuffer,
+      out_tex, gst_gl_video_mixer_callback, (gpointer) video_mixer);
+
+  return TRUE;
+}
+
+/* opengl scene, params: input texture (not the output mixer->texture) */
+static void
+gst_gl_video_mixer_callback (gpointer stuff)
+{
+  GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (stuff);
+  GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
+  GstGLFuncs *gl = mixer->context->gl_vtable;
+
+  GLint attr_position_loc = 0;
+  GLint attr_texture_loc = 0;
+  guint out_width, out_height;
+
+  const GLushort indices[] = {
+    0, 1, 2,
+    0, 2, 3
+  };
+
+  guint count = 0;
+
+  out_width = GST_VIDEO_INFO_WIDTH (&mixer->out_info);
+  out_height = GST_VIDEO_INFO_HEIGHT (&mixer->out_info);
+
+  gst_gl_context_clear_shader (mixer->context);
+  gl->BindTexture (GL_TEXTURE_RECTANGLE_ARB, 0);
+  gl->Disable (GL_TEXTURE_RECTANGLE_ARB);
+
+  gl->Disable (GL_DEPTH_TEST);
+  gl->Disable (GL_CULL_FACE);
+
+  gl->ClearColor (0.0, 0.0, 0.0, 0.0);
+  gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  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);
+
+  while (count < video_mixer->input_textures->len) {
+    GstVideoFrame *in_frame;
+    GLfloat *v_vertices;
+    guint in_tex;
+    guint in_width, in_height;
+    gfloat w, h;
+
+    in_frame = g_ptr_array_index (video_mixer->input_frames, count);
+    in_tex = g_array_index (video_mixer->input_textures, guint, count);
+    in_width = GST_VIDEO_FRAME_WIDTH (in_frame);
+    in_height = GST_VIDEO_FRAME_HEIGHT (in_frame);
+
+    if (!in_frame || !in_tex || in_width <= 0 || in_height <= 0) {
+      GST_DEBUG ("skipping texture:%u frame:%p width:%u height %u",
+          in_tex, in_frame, in_width, in_height);
+      count++;
+      continue;
+    }
+
+    GST_TRACE ("processing texture:%u dimensions:%ux%u", in_tex, in_width,
+        in_height);
+
+    w = ((gfloat) in_width / (gfloat) out_width);
+    h = ((gfloat) in_height / (gfloat) out_height);
+    GST_TRACE ("processing texture:%u dimensions:%ux%u, %fx%f", in_tex,
+        in_width, in_height, w, h);
+
+    /* *INDENT-OFF* */
+    v_vertices = (GLfloat[]) {
+      /* front face */
+      -1.0, -1.0, -1.0f,
+      0.0f, 0.0f,
+      1.0, -1.0, -1.0f,
+      in_width, 0.0f,
+      1.0, 1.0, -1.0f,
+      in_width, in_height,
+      -1.0, 1.0, -1.0f,
+      0.0f, in_height,
+    };
+    /* *INDENT-ON* */
+
+    gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
+        GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[0]);
+
+    gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT,
+        GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[3]);
+
+    gl->EnableVertexAttribArray (attr_position_loc);
+    gl->EnableVertexAttribArray (attr_texture_loc);
+
+    gl->BlendFunc (GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR);
+    gl->BlendEquation (GL_FUNC_ADD);
+
+    gl->ActiveTexture (GL_TEXTURE0);
+    gl->BindTexture (GL_TEXTURE_RECTANGLE_ARB, in_tex);
+    gst_gl_shader_set_uniform_1i (video_mixer->shader, "texture", 0);
+    gst_gl_shader_set_uniform_1f (video_mixer->shader, "x_scale", w);
+    gst_gl_shader_set_uniform_1f (video_mixer->shader, "y_scale", h);
+
+    gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
+
+    ++count;
+  }
+
+  gl->DisableVertexAttribArray (attr_position_loc);
+  gl->DisableVertexAttribArray (attr_texture_loc);
+
+  gl->BindTexture (GL_TEXTURE_RECTANGLE_ARB, 0);
+
+  gl->Disable (GL_BLEND);
+
+  gst_gl_context_clear_shader (mixer->context);
+}
diff --git a/gst/gl/gstglvideomixer.h b/gst/gl/gstglvideomixer.h
new file mode 100644
index 000000000..6df5f04f3
--- /dev/null
+++ b/gst/gl/gstglvideomixer.h
@@ -0,0 +1,56 @@
+/*
+ * 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.
+ */
+
+#ifndef _GST_GL_VIDEO_MIXER_H_
+#define _GST_GL_VIDEO_MIXER_H_
+
+#include <gst/gl/gstglmixer.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_GL_VIDEO_MIXER            (gst_gl_video_mixer_get_type())
+#define GST_GL_VIDEO_MIXER(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_VIDEO_MIXER,GstGLVideoMixer))
+#define GST_IS_GL_VIDEO_MIXER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_VIDEO_MIXER))
+#define GST_GL_VIDEO_MIXER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_GL_VIDEO_MIXER,GstGLVideoMixerClass))
+#define GST_IS_GL_VIDEO_MIXER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_GL_VIDEO_MIXER))
+#define GST_GL_VIDEO_MIXER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_GL_VIDEO_MIXER,GstGLVideoMixerClass))
+
+typedef struct _GstGLVideoMixer GstGLVideoMixer;
+typedef struct _GstGLVideoMixerClass GstGLVideoMixerClass;
+
+struct _GstGLVideoMixer
+{
+    GstGLMixer mixer;
+
+    GstGLShader *shader;
+    GArray *input_textures;
+    GPtrArray *input_frames;
+};
+
+struct _GstGLVideoMixerClass
+{
+    GstGLMixerClass mixer_class;
+};
+
+GType gst_gl_video_mixer_get_type (void);
+
+G_END_DECLS
+
+#endif /* _GST_GLFILTERCUBE_H_ */
diff --git a/gst/gl/gstopengl.c b/gst/gl/gstopengl.c
index 010a96c0b..b905f51a9 100644
--- a/gst/gl/gstopengl.c
+++ b/gst/gl/gstopengl.c
@@ -67,6 +67,7 @@ GType gst_gl_effects_get_type (void);
 #include "gstglcolorscale.h"
 #include "gstgldeinterlace.h"
 #include "gstglmosaic.h"
+#include "gstglvideomixer.h"
 
 GType gst_gl_deinterlace_get_type (void);
 GType gst_gl_filter_app_get_type (void);
@@ -177,6 +178,11 @@ plugin_init (GstPlugin * plugin)
           GST_RANK_NONE, GST_TYPE_GL_MOSAIC)) {
     return FALSE;
   }
+
+  if (!gst_element_register (plugin, "glvideomixer",
+          GST_RANK_NONE, GST_TYPE_GL_VIDEO_MIXER)) {
+    return FALSE;
+  }
 #if HAVE_PNG
   if (!gst_element_register (plugin, "gldifferencematte",
           GST_RANK_NONE, gst_gl_differencematte_get_type ())) {