gl libs: Add glviewconvert helper object

Add API for a helper object that can convert between different
stereoscopic video representations, and later do filtering
of multiple view streams.

https://bugzilla.gnome.org/show_bug.cgi?id=611157

gst-libs/gst/gl/Makefile.am

@@ -27,7 +27,8 @@ libgstgl_@GST_API_VERSION@_la_SOURCES = \
         gstglfeature.c \
         gstglutils.c \
         gstglframebuffer.c \
-        gstglsyncmeta.c
+        gstglsyncmeta.c \
+        gstglviewconvert.c
 
 libgstgl_@GST_API_VERSION@includedir = $(includedir)/gstreamer-@GST_API_VERSION@/gst/gl
 libgstgl_@GST_API_VERSION@include_HEADERS = \
@@ -50,6 +51,7 @@ libgstgl_@GST_API_VERSION@include_HEADERS = \
 	gstglutils.h \
 	gstglframebuffer.h \
 	gstglsyncmeta.h \
+	gstglviewconvert.h \
 	gstgl_fwd.h \
 	gl.h
 

gst-libs/gst/gl/gl.h

@@ -44,6 +44,7 @@
 #include <gst/gl/gstglbufferpool.h>
 #include <gst/gl/gstglframebuffer.h>
 #include <gst/gl/gstglbasefilter.h>
+#include <gst/gl/gstglviewconvert.h>
 #include <gst/gl/gstglfilter.h>
 #include <gst/gl/gstglshadervariables.h>
 #include <gst/gl/gstglsyncmeta.h>

gst-libs/gst/gl/gstgl_fwd.h

@@ -74,6 +74,10 @@ typedef struct _GstGLBaseFilterPrivate GstGLBaseFilterPrivate;
 typedef struct _GstGLFilter GstGLFilter;
 typedef struct _GstGLFilterClass GstGLFilterClass;
 
+typedef struct _GstGLViewConvert GstGLViewConvert;
+typedef struct _GstGLViewConvertClass GstGLViewConvertClass;
+typedef struct _GstGLViewConvertPrivate GstGLViewConvertPrivate;
+
 G_END_DECLS
 
 #endif /* __GST_GL_FWD_H__ */

gst-libs/gst/gl/gstglviewconvert.h

@@ -0,0 +1,98 @@
+/*
+ * GStreamer
+ * Copyright (C) 2014 Jan Schmidt <jan@centricular.com>
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef _GST_GL_VIEW_CONVERT_H_
+#define _GST_GL_VIEW_CONVERT_H_
+
+#include <gst/gl/gl.h>
+
+G_BEGIN_DECLS
+#define GST_TYPE_GL_VIEW_CONVERT            (gst_gl_view_convert_get_type())
+#define GST_GL_VIEW_CONVERT(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_VIEW_CONVERT,GstGLViewConvert))
+#define GST_IS_GL_VIEW_CONVERT(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_VIEW_CONVERT))
+#define GST_GL_VIEW_CONVERT_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_GL_VIEW_CONVERT,GstGLViewConvertClass))
+#define GST_IS_GL_VIEW_CONVERT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_GL_VIEW_CONVERT))
+#define GST_GL_VIEW_CONVERT_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_GL_VIEW_CONVERT,GstGLViewConvertClass))
+
+#define GST_TYPE_GL_STEREO_DOWNMIX_MODE_TYPE gst_gl_stereo_downmix_mode_get_type()
+GType gst_gl_stereo_downmix_mode_get_type (void);
+
+enum _GstGLStereoDownmix {
+  GST_GL_STEREO_DOWNMIX_ANAGLYPH_GREEN_MAGENTA_DUBOIS,
+  GST_GL_STEREO_DOWNMIX_ANAGLYPH_RED_CYAN_DUBOIS,
+  GST_GL_STEREO_DOWNMIX_ANAGLYPH_AMBER_BLUE_DUBOIS,
+};
+
+typedef enum _GstGLStereoDownmix GstGLStereoDownmix;
+
+struct _GstGLViewConvert
+{
+  GstObject object;
+
+  GstGLContext *context;
+
+  GstGLShader *shader;
+
+  GstVideoMultiviewMode input_mode_override;
+  GstVideoMultiviewFlags input_flags_override;
+  GstVideoMultiviewMode output_mode_override;
+  GstVideoMultiviewFlags output_flags_override;
+
+  GstGLStereoDownmix downmix_mode;
+
+  GstVideoInfo in_info;
+  GstVideoInfo out_info;
+
+  gboolean initted;
+  gboolean reconfigure;
+
+  GLuint fbo;
+  GLuint depth_buffer;
+
+  GstGLViewConvertPrivate *priv;
+};
+
+struct _GstGLViewConvertClass
+{
+  GstObjectClass object_class;
+};
+
+GType gst_gl_view_convert_get_type (void);
+GstGLViewConvert * gst_gl_view_convert_new (void);
+
+gboolean gst_gl_view_convert_set_format (GstGLViewConvert *viewconvert, GstVideoInfo *in_info,
+    GstVideoInfo *out_info);
+gboolean  gst_gl_view_convert_set_caps (GstGLViewConvert * viewconvert, GstCaps * in_caps, GstCaps * out_caps);
+GstCaps * gst_gl_view_convert_transform_caps (GstGLViewConvert * viewconvert,
+    GstPadDirection direction, GstCaps * caps, GstCaps * filter);
+GstCaps * gst_gl_view_convert_fixate_caps (GstGLViewConvert *viewconvert,
+    GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
+GstFlowReturn gst_gl_view_convert_submit_input_buffer (GstGLViewConvert *viewconvert,
+    gboolean is_discont, GstBuffer * input);
+GstFlowReturn gst_gl_view_convert_get_output (GstGLViewConvert *viewconvert,
+    GstBuffer ** outbuf_ptr);
+
+GstBuffer * gst_gl_view_convert_perform (GstGLViewConvert * viewconvert, GstBuffer *inbuf);
+void gst_gl_view_convert_reset (GstGLViewConvert * viewconvert);
+void gst_gl_view_convert_set_context (GstGLViewConvert *viewconvert, GstGLContext * context);
+
+G_END_DECLS
+#endif /* _GST_GL_VIEW_CONVERT_H_ */