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202 lines
5.9 KiB
C
202 lines
5.9 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 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-glfilterapp
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*
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* The resize and redraw callbacks can be set from a client code.
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*
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* <refsect2>
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* <title>CLient callbacks</title>
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* <para>
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* The graphic scene can be written from a client code through the
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* two glfilterapp properties.
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* </para>
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* </refsect2>
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* <refsect2>
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* <title>Examples</title>
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* see gst-plugins-gl/tests/examples/generic/recordgraphic
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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 "gstglfilterapp.h"
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#define GST_CAT_DEFAULT gst_gl_filter_app_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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SIGNAL_0,
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CLIENT_DRAW_SIGNAL,
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LAST_SIGNAL
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};
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static guint gst_gl_filter_app_signals[LAST_SIGNAL] = { 0 };
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#define DEBUG_INIT \
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GST_DEBUG_CATEGORY_INIT (gst_gl_filter_app_debug, "glfilterapp", 0, "glfilterapp element");
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G_DEFINE_TYPE_WITH_CODE (GstGLFilterApp, gst_gl_filter_app,
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GST_TYPE_GL_FILTER, DEBUG_INIT);
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static void gst_gl_filter_app_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_gl_filter_app_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_gl_filter_app_set_caps (GstGLFilter * filter,
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GstCaps * incaps, GstCaps * outcaps);
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static gboolean gst_gl_filter_app_filter_texture (GstGLFilter * filter,
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guint in_tex, guint out_tex);
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static void gst_gl_filter_app_callback (gint width, gint height, guint texture,
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gpointer stuff);
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static void
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gst_gl_filter_app_class_init (GstGLFilterAppClass * 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_filter_app_set_property;
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gobject_class->get_property = gst_gl_filter_app_get_property;
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GST_GL_FILTER_CLASS (klass)->set_caps = gst_gl_filter_app_set_caps;
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GST_GL_FILTER_CLASS (klass)->filter_texture =
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gst_gl_filter_app_filter_texture;
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/**
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* GstGLFilterApp::client-draw:
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* @object: the #GstGLImageSink
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* @texture: the #guint id of the texture.
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* @width: the #guint width of the texture.
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* @height: the #guint height of the texture.
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*
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* Will be emitted before to draw the texture. The client should
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* redraw the surface/contents with the @texture, @width and @height.
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*
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* Returns: whether the texture was redrawn by the signal. If not, a
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* default redraw will occur.
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*/
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gst_gl_filter_app_signals[CLIENT_DRAW_SIGNAL] =
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g_signal_new ("client-draw", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
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G_TYPE_BOOLEAN, 3, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_UINT);
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gst_element_class_set_metadata (element_class,
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"OpenGL application filter", "Filter/Effect",
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"Use client callbacks to define the scene",
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"Julien Isorce <julien.isorce@gmail.com>");
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}
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static void
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gst_gl_filter_app_init (GstGLFilterApp * filter)
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{
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}
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static void
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gst_gl_filter_app_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_filter_app_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 gboolean
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gst_gl_filter_app_set_caps (GstGLFilter * filter, GstCaps * incaps,
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GstCaps * outcaps)
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{
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//GstGLFilterApp* app_filter = GST_GL_FILTER_APP(filter);
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return TRUE;
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}
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static void
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_emit_draw_signal (guint tex, gint width, gint height, gpointer data)
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{
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GstGLFilterApp *app_filter = GST_GL_FILTER_APP (data);
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gboolean drawn;
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g_signal_emit (app_filter, gst_gl_filter_app_signals[CLIENT_DRAW_SIGNAL], 0,
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tex, width, height, &drawn);
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app_filter->default_draw = !drawn;
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}
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static gboolean
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gst_gl_filter_app_filter_texture (GstGLFilter * filter, guint in_tex,
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guint out_tex)
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{
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GstGLFilterApp *app_filter = GST_GL_FILTER_APP (filter);
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//blocking call, use a FBO
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gst_gl_context_use_fbo (filter->context,
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GST_VIDEO_INFO_WIDTH (&filter->out_info),
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GST_VIDEO_INFO_HEIGHT (&filter->out_info),
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filter->fbo, filter->depthbuffer, out_tex, (GLCB) _emit_draw_signal,
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GST_VIDEO_INFO_WIDTH (&filter->in_info),
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GST_VIDEO_INFO_HEIGHT (&filter->in_info),
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in_tex, 45,
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(gfloat) GST_VIDEO_INFO_WIDTH (&filter->out_info) /
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(gfloat) GST_VIDEO_INFO_HEIGHT (&filter->out_info),
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0.1, 100, GST_GL_DISPLAY_PROJECTION_PERSPECTIVE, filter);
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if (app_filter->default_draw) {
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gst_gl_filter_render_to_target (filter, TRUE, in_tex, out_tex,
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gst_gl_filter_app_callback, filter);
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}
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return TRUE;
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}
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//opengl scene, params: input texture (not the output filter->texture)
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static void
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gst_gl_filter_app_callback (gint width, gint height, guint texture,
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gpointer stuff)
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{
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GstGLFilter *filter = GST_GL_FILTER (stuff);
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GstGLFuncs *gl = filter->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
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gl->LoadIdentity ();
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gst_gl_filter_draw_texture (filter, texture, width, height);
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}
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