mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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293 lines
9.5 KiB
C
293 lines
9.5 KiB
C
/*
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* GStreamer
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* Copyright (C) 2009 Julien Isorce <julien.isorce@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-glvideomixer
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*
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* glmixer sub element. N gl sink pads to 1 source pad.
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* N + 1 OpenGL contexts shared together.
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* N <= 6 because the rendering is more a like a cube than a video_mixer
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* Each opengl input stream is rendered on a cube face
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*
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* <refsect2>
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* <title>Examples</title>
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* |[
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* 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.
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* ]|
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* FBO (Frame Buffer Object) is required.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstglvideomixer.h"
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#define GST_CAT_DEFAULT gst_gl_video_mixer_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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enum
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{
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PROP_0,
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};
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#define DEBUG_INIT \
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GST_DEBUG_CATEGORY_INIT (gst_gl_video_mixer_debug, "glvideomixer", 0, "glvideomixer element");
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G_DEFINE_TYPE_WITH_CODE (GstGLVideoMixer, gst_gl_video_mixer, GST_TYPE_GL_MIXER,
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DEBUG_INIT);
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static void gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_gl_video_mixer_reset (GstGLMixer * mixer);
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static gboolean gst_gl_video_mixer_init_shader (GstGLMixer * mixer,
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GstCaps * outcaps);
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static gboolean gst_gl_video_mixer_process_textures (GstGLMixer * mixer,
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GPtrArray * in_frames, guint out_tex);
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static void gst_gl_video_mixer_callback (gpointer stuff);
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/* vertex source */
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static const gchar *video_mixer_v_src =
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"attribute vec4 a_position; \n"
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"attribute vec2 a_texCoord; \n"
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"uniform float x_scale; \n"
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"uniform float y_scale; \n"
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"varying vec2 v_texCoord; \n"
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"void main() \n"
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"{ \n"
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" gl_Position = a_position * vec4(x_scale, y_scale, 1.0, 1.0);\n"
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" v_texCoord = a_texCoord; \n" "}";
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/* fragment source */
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static const gchar *video_mixer_f_src =
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"uniform sampler2D texture; \n"
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"varying vec2 v_texCoord; \n"
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"void main() \n"
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"{ \n"
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" vec4 rgba = texture2D( texture, v_texCoord );\n"
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" gl_FragColor = vec4(rgba.rgb, 1.0);\n"
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"} \n";
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static void
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gst_gl_video_mixer_class_init (GstGLVideoMixerClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *element_class;
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gobject_class = (GObjectClass *) klass;
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element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->set_property = gst_gl_video_mixer_set_property;
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gobject_class->get_property = gst_gl_video_mixer_get_property;
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gst_element_class_set_metadata (element_class, "OpenGL video_mixer",
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"Filter/Effect/Video", "OpenGL video_mixer",
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"Julien Isorce <julien.isorce@gmail.com>");
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GST_GL_MIXER_CLASS (klass)->set_caps = gst_gl_video_mixer_init_shader;
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GST_GL_MIXER_CLASS (klass)->reset = gst_gl_video_mixer_reset;
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GST_GL_MIXER_CLASS (klass)->process_textures =
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gst_gl_video_mixer_process_textures;
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}
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static void
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gst_gl_video_mixer_init (GstGLVideoMixer * video_mixer)
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{
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video_mixer->shader = NULL;
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video_mixer->input_frames = NULL;
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}
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static void
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gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_gl_video_mixer_reset (GstGLMixer * mixer)
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{
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GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
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video_mixer->input_frames = NULL;
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if (video_mixer->shader)
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gst_gl_context_del_shader (mixer->context, video_mixer->shader);
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video_mixer->shader = NULL;
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}
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static gboolean
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gst_gl_video_mixer_init_shader (GstGLMixer * mixer, GstCaps * outcaps)
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{
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GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
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return gst_gl_context_gen_shader (mixer->context, video_mixer_v_src,
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video_mixer_f_src, &video_mixer->shader);
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}
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static gboolean
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gst_gl_video_mixer_process_textures (GstGLMixer * mix, GPtrArray * frames,
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guint out_tex)
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{
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GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mix);
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video_mixer->input_frames = frames;
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gst_gl_context_use_fbo_v2 (mix->context,
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GST_VIDEO_INFO_WIDTH (&mix->out_info),
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GST_VIDEO_INFO_HEIGHT (&mix->out_info), mix->fbo, mix->depthbuffer,
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out_tex, gst_gl_video_mixer_callback, (gpointer) video_mixer);
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return TRUE;
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}
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/* opengl scene, params: input texture (not the output mixer->texture) */
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static void
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gst_gl_video_mixer_callback (gpointer stuff)
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{
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GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (stuff);
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GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
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GstGLFuncs *gl = mixer->context->gl_vtable;
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GLint attr_position_loc = 0;
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GLint attr_texture_loc = 0;
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guint out_width, out_height;
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const GLushort indices[] = {
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0, 1, 2,
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0, 2, 3
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};
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guint count = 0;
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out_width = GST_VIDEO_INFO_WIDTH (&mixer->out_info);
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out_height = GST_VIDEO_INFO_HEIGHT (&mixer->out_info);
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gst_gl_context_clear_shader (mixer->context);
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gl->BindTexture (GL_TEXTURE_2D, 0);
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gl->Disable (GL_TEXTURE_2D);
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gl->Disable (GL_DEPTH_TEST);
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gl->Disable (GL_CULL_FACE);
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gl->ClearColor (0.0, 0.0, 0.0, 0.0);
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gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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gst_gl_shader_use (video_mixer->shader);
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attr_position_loc =
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gst_gl_shader_get_attribute_location (video_mixer->shader, "a_position");
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attr_texture_loc =
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gst_gl_shader_get_attribute_location (video_mixer->shader, "a_texCoord");
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gl->Enable (GL_BLEND);
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while (count < video_mixer->input_frames->len) {
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GstGLMixerFrameData *frame;
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/* *INDENT-OFF* */
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gfloat v_vertices[] = {
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/* front face */
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-1.0,-1.0,-1.0f, 0.0f, 0.0f,
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1.0,-1.0,-1.0f, 1.0f, 0.0f,
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1.0, 1.0,-1.0f, 1.0f, 1.0f,
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-1.0, 1.0,-1.0f, 0.0f, 1.0f,
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};
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/* *INDENT-ON* */
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guint in_tex;
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guint in_width, in_height;
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gfloat w, h;
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frame = g_ptr_array_index (video_mixer->input_frames, count);
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if (!frame) {
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GST_DEBUG ("skipping texture, null frame");
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count++;
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continue;
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}
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in_width = GST_VIDEO_INFO_WIDTH (&frame->pad->in_info);
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in_height = GST_VIDEO_INFO_HEIGHT (&frame->pad->in_info);
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if (!frame->texture || in_width <= 0 || in_height <= 0) {
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GST_DEBUG ("skipping texture:%u frame:%p width:%u height %u",
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frame->texture, frame, in_width, in_height);
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count++;
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continue;
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}
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in_tex = frame->texture;
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GST_TRACE ("processing texture:%u dimensions:%ux%u", in_tex, in_width,
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in_height);
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w = ((gfloat) in_width / (gfloat) out_width);
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h = ((gfloat) in_height / (gfloat) out_height);
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GST_TRACE ("processing texture:%u dimensions:%ux%u, %fx%f", in_tex,
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in_width, in_height, w, h);
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gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
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GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[0]);
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gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT,
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GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[3]);
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gl->EnableVertexAttribArray (attr_position_loc);
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gl->EnableVertexAttribArray (attr_texture_loc);
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gl->BlendFunc (GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR);
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gl->BlendEquation (GL_FUNC_ADD);
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gl->ActiveTexture (GL_TEXTURE0);
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gl->BindTexture (GL_TEXTURE_2D, in_tex);
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gst_gl_shader_set_uniform_1i (video_mixer->shader, "texture", 0);
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gst_gl_shader_set_uniform_1f (video_mixer->shader, "x_scale", w);
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gst_gl_shader_set_uniform_1f (video_mixer->shader, "y_scale", h);
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gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
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++count;
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}
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gl->DisableVertexAttribArray (attr_position_loc);
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gl->DisableVertexAttribArray (attr_texture_loc);
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gl->BindTexture (GL_TEXTURE_2D, 0);
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gl->Disable (GL_BLEND);
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gst_gl_context_clear_shader (mixer->context);
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}
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