/* * GStreamer * Copyright (C) 2009 Julien Isorce * * 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 * * * Examples * |[ * 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. * */ #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, GPtrArray * in_frames, guint out_tex); static void gst_gl_video_mixer_callback (gpointer stuff); /* vertex source */ static const gchar *video_mixer_v_src = "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 = "uniform sampler2D texture; \n" "varying vec2 v_texCoord; \n" "void main() \n" "{ \n" " vec4 rgba = texture2D( 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 "); 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_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_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, GPtrArray * frames, guint out_tex) { GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mix); video_mixer->input_frames = 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_2D, 0); gl->Disable (GL_TEXTURE_2D); 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_frames->len) { GstGLMixerFrameData *frame; /* *INDENT-OFF* */ gfloat v_vertices = { /* front face */ -1.0,-1.0,-1.0f, 0.0f, 0.0f, 1.0,-1.0,-1.0f, 1.0f, 0.0f, 1.0, 1.0,-1.0f, 1.0f, 1.0f, -1.0, 1.0,-1.0f, 0.0f, 1.0f, }; /* *INDENT-ON* */ guint in_tex; guint in_width, in_height; gfloat w, h; frame = g_ptr_array_index (video_mixer->input_frames, count); in_width = GST_VIDEO_INFO_WIDTH (&frame->pad->in_info); in_height = GST_VIDEO_INFO_HEIGHT (&frame->pad->in_info); if (!frame || !frame->texture || in_width <= 0 || in_height <= 0) { GST_DEBUG ("skipping texture:%u frame:%p width:%u height %u", in_tex, frame, in_width, in_height); count++; continue; } in_tex = frame->texture; 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); 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_2D, 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_2D, 0); gl->Disable (GL_BLEND); gst_gl_context_clear_shader (mixer->context); }