gl: add new gldownloadelement

Simply transforms caps to/from raw/glmemory capsfeatures

ext/gl/Makefile.am

@@ -4,6 +4,7 @@ libgstopengl_la_SOURCES = \
 	gstopengl.c \
 	gstglbasemixer.c \
 	gstgluploadelement.c \
+	gstgldownloadelement.c \
 	gstglcolorconvertelement.c \
 	gstglimagesink.c \
 	gstglfiltercube.c \
@@ -21,6 +22,7 @@ libgstopengl_la_SOURCES = \
 noinst_HEADERS = \
 	gstglbasemixer.h \
 	gstgluploadelement.h \
+	gstgldownloadelement.h \
 	gstglcolorconvertelement.h \
 	gstglimagesink.h \
 	gstglfiltercube.h \

ext/gl/gstgldownloadelement.c

@@ -0,0 +1,183 @@
+/*
+ * GStreamer
+ * Copyright (C) 2012 Matthew Waters <ystree00@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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gl/gl.h>
+#include "gstgldownloadelement.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_gl_download_element_debug);
+#define GST_CAT_DEFAULT gst_gl_download_element_debug
+
+#define gst_gl_download_element_parent_class parent_class
+G_DEFINE_TYPE_WITH_CODE (GstGLDownloadElement, gst_gl_download_element,
+    GST_TYPE_GL_BASE_FILTER,
+    GST_DEBUG_CATEGORY_INIT (gst_gl_download_element_debug, "gldownloadelement",
+        0, "download element");
+    );
+static void gst_gl_download_element_finalize (GObject * object);
+
+static gboolean gst_gl_download_element_get_unit_size (GstBaseTransform * trans,
+    GstCaps * caps, gsize * size);
+static GstCaps *gst_gl_download_element_transform_caps (GstBaseTransform * bt,
+    GstPadDirection direction, GstCaps * caps, GstCaps * filter);
+static gboolean gst_gl_download_element_set_caps (GstBaseTransform * bt,
+    GstCaps * in_caps, GstCaps * out_caps);
+static GstFlowReturn
+gst_gl_download_element_prepare_output_buffer (GstBaseTransform * bt,
+    GstBuffer * buffer, GstBuffer ** outbuf);
+static GstFlowReturn gst_gl_download_element_transform (GstBaseTransform * bt,
+    GstBuffer * buffer, GstBuffer * outbuf);
+
+static GstStaticPadTemplate gst_gl_download_element_src_pad_template =
+    GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-raw; video/x-raw(memory:GLMemory)"));
+
+static GstStaticPadTemplate gst_gl_download_element_sink_pad_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-raw(memory:GLMemory)"));
+
+static void
+gst_gl_download_element_class_init (GstGLDownloadElementClass * klass)
+{
+  GstBaseTransformClass *bt_class = GST_BASE_TRANSFORM_CLASS (klass);
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  bt_class->transform_caps = gst_gl_download_element_transform_caps;
+  bt_class->set_caps = gst_gl_download_element_set_caps;
+  bt_class->get_unit_size = gst_gl_download_element_get_unit_size;
+  bt_class->prepare_output_buffer =
+      gst_gl_download_element_prepare_output_buffer;
+  bt_class->transform = gst_gl_download_element_transform;
+
+  bt_class->passthrough_on_same_caps = TRUE;
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_gl_download_element_src_pad_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_gl_download_element_sink_pad_template));
+
+  gst_element_class_set_metadata (element_class,
+      "OpenGL uploader", "Filter/Video",
+      "Uploads data into OpenGL", "Matthew Waters <matthew@centricular.com>");
+
+  G_OBJECT_CLASS (klass)->finalize = gst_gl_download_element_finalize;
+}
+
+static void
+gst_gl_download_element_init (GstGLDownloadElement * download)
+{
+  gst_base_transform_set_prefer_passthrough (GST_BASE_TRANSFORM (download),
+      TRUE);
+}
+
+static void
+gst_gl_download_element_finalize (GObject * object)
+{
+  G_OBJECT_CLASS (gst_gl_download_element_parent_class)->finalize (object);
+}
+
+static gboolean
+gst_gl_download_element_set_caps (GstBaseTransform * bt, GstCaps * in_caps,
+    GstCaps * out_caps)
+{
+  GstVideoInfo out_info;
+
+  if (!gst_video_info_from_caps (&out_info, out_caps))
+    return FALSE;
+
+  return TRUE;
+}
+
+static GstCaps *
+_set_caps_features (const GstCaps * caps, const gchar * feature_name)
+{
+  GstCaps *tmp = gst_caps_copy (caps);
+  guint n = gst_caps_get_size (tmp);
+  guint i = 0;
+
+  for (i = 0; i < n; i++)
+    gst_caps_set_features (tmp, i,
+        gst_caps_features_from_string (feature_name));
+
+  return tmp;
+}
+
+static GstCaps *
+gst_gl_download_element_transform_caps (GstBaseTransform * bt,
+    GstPadDirection direction, GstCaps * caps, GstCaps * filter)
+{
+  GstCaps *result, *tmp;
+
+  if (direction == GST_PAD_SRC) {
+    tmp = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_GL_MEMORY);
+    tmp = gst_caps_merge (gst_caps_ref (caps), tmp);
+  } else {
+    tmp = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
+    tmp = gst_caps_merge (gst_caps_ref (caps), tmp);
+  }
+
+  if (filter) {
+    result = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
+    gst_caps_unref (tmp);
+  } else {
+    result = tmp;
+  }
+
+  GST_DEBUG_OBJECT (bt, "returning caps %" GST_PTR_FORMAT, result);
+
+  return result;
+}
+
+static gboolean
+gst_gl_download_element_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
+    gsize * size)
+{
+  gboolean ret = FALSE;
+  GstVideoInfo info;
+
+  ret = gst_video_info_from_caps (&info, caps);
+  if (ret)
+    *size = GST_VIDEO_INFO_SIZE (&info);
+
+  return TRUE;
+}
+
+static GstFlowReturn
+gst_gl_download_element_prepare_output_buffer (GstBaseTransform * bt,
+    GstBuffer * inbuf, GstBuffer ** outbuf)
+{
+  *outbuf = inbuf;
+
+  return GST_FLOW_OK;
+}
+
+static GstFlowReturn
+gst_gl_download_element_transform (GstBaseTransform * bt,
+    GstBuffer * inbuf, GstBuffer * outbuf)
+{
+  return GST_FLOW_OK;
+}

ext/gl/gstgldownloadelement.h

@@ -0,0 +1,56 @@
+/*
+ * GStreamer
+ * Copyright (C) 2012 Matthew Waters <ystree00@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_DOWNLOAD_ELEMENT_H__
+#define __GST_GL_DOWNLOAD_ELEMENT_H__
+
+#include <gst/video/video.h>
+#include <gst/gstmemory.h>
+
+#include <gst/gl/gl.h>
+
+G_BEGIN_DECLS
+
+GType gst_gl_download_element_get_type (void);
+#define GST_TYPE_GL_DOWNLOAD_ELEMENT (gst_gl_download_element_get_type())
+#define GST_GL_DOWNLOAD_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_DOWNLOAD_ELEMENT,GstGLDownloadElement))
+#define GST_GL_DOWNLOAD_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_DISPLAY,GstGLDownloadElementClass))
+#define GST_IS_GL_DOWNLOAD_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_DOWNLOAD_ELEMENT))
+#define GST_IS_GL_DOWNLOAD_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_DOWNLOAD_ELEMENT))
+#define GST_GL_DOWNLOAD_ELEMENT_CAST(obj) ((GstGLDownloadElement*)(obj))
+
+typedef struct _GstGLDownloadElement GstGLDownloadElement;
+typedef struct _GstGLDownloadElementClass GstGLDownloadElementClass;
+
+struct _GstGLDownloadElement
+{
+  /* <private> */
+  GstGLBaseFilter  parent;
+};
+
+struct _GstGLDownloadElementClass
+{
+  /* <private> */
+  GstGLBaseFilterClass object_class;
+};
+
+G_END_DECLS
+
+#endif /* __GST_GL_DOWNLOAD_ELEMENT_H__ */

ext/gl/gstopengl.c

@@ -45,6 +45,7 @@
 
 #include "gstglimagesink.h"
 #include "gstgluploadelement.h"
+#include "gstgldownloadelement.h"
 #include "gstglcolorconvertelement.h"
 
 #include "gstglfiltercube.h"
@@ -119,6 +120,11 @@ plugin_init (GstPlugin * plugin)
     return FALSE;
   }
 
+  if (!gst_element_register (plugin, "gldownload",
+          GST_RANK_SECONDARY, GST_TYPE_GL_DOWNLOAD_ELEMENT)) {
+    return FALSE;
+  }
+
   if (!gst_element_register (plugin, "glcolorconvert",
           GST_RANK_SECONDARY, GST_TYPE_GL_COLOR_CONVERT_ELEMENT)) {
     return FALSE;