gl: new glsrcbin element

ext/gl/Makefile.am

@@ -9,6 +9,7 @@ libgstopengl_la_SOURCES = \
 	gstglfilterbin.c \
 	gstglmixerbin.c \
 	gstglsinkbin.c \
+	gstglsrcbin.c \
 	gstglimagesink.c \
 	gstglfiltercube.c \
 	gstgleffects.c \
@@ -30,6 +31,7 @@ noinst_HEADERS = \
 	gstglfilterbin.h \
 	gstglmixerbin.h \
 	gstglsinkbin.h \
+	gstglsrcbin.h \
 	gstglimagesink.h \
 	gstglfiltercube.h \
 	gstgleffects.h \

ext/gl/gstglsrcbin.c

@@ -0,0 +1,273 @@
+/*
+ * GStreamer
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstglsrcbin.h"
+
+GST_DEBUG_CATEGORY (gst_debug_gl_src_bin);
+#define GST_CAT_DEFAULT gst_debug_gl_src_bin
+
+static void gst_gl_src_bin_finalize (GObject * object);
+static void gst_gl_src_bin_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * param_spec);
+static void gst_gl_src_bin_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * param_spec);
+
+static GstStateChangeReturn gst_gl_src_bin_change_state (GstElement * element,
+    GstStateChange transition);
+
+static GstStaticPadTemplate gst_gl_src_bin_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-raw(ANY)"));
+
+enum
+{
+  PROP_0,
+  PROP_SRC,
+};
+
+enum
+{
+  SIGNAL_0,
+  SIGNAL_CREATE_ELEMENT,
+  SIGNAL_LAST,
+};
+
+static guint gst_gl_src_bin_signals[SIGNAL_LAST] = { 0, };
+
+#define gst_gl_src_bin_parent_class parent_class
+G_DEFINE_TYPE_WITH_CODE (GstGLSrcBin, gst_gl_src_bin,
+    GST_TYPE_BIN,
+    GST_DEBUG_CATEGORY_INIT (gst_debug_gl_src_bin, "glsrcbin", 0,
+        "OpenGL Video Src Bin"));
+
+static void
+gst_gl_src_bin_class_init (GstGLSrcBinClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *element_class;
+
+  gobject_class = (GObjectClass *) klass;
+  element_class = GST_ELEMENT_CLASS (klass);
+
+  element_class->change_state = gst_gl_src_bin_change_state;
+
+  gobject_class->set_property = gst_gl_src_bin_set_property;
+  gobject_class->get_property = gst_gl_src_bin_get_property;
+  gobject_class->finalize = gst_gl_src_bin_finalize;
+
+  g_object_class_install_property (gobject_class, PROP_SRC,
+      g_param_spec_object ("src",
+          "GL src element",
+          "The GL src chain to use",
+          GST_TYPE_ELEMENT,
+          GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
+          G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GstGLSrcBin::create-element:
+   * @object: the #GstGLSrcBin
+   *
+   * Will be emitted when we need the processing element/s that this bin will use
+   *
+   * Returns: a new #GstElement
+   */
+  gst_gl_src_bin_signals[SIGNAL_CREATE_ELEMENT] =
+      g_signal_new ("create-element", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
+      GST_TYPE_ELEMENT, 0);
+
+  gst_element_class_set_metadata (element_class,
+      "GL Src Bin", "Src/Video",
+      "Infrastructure to process GL textures",
+      "Matthew Waters <matthew@centricular.com>");
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_gl_src_bin_template));
+}
+
+static void
+gst_gl_src_bin_finalize (GObject * object)
+{
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gst_gl_src_bin_init (GstGLSrcBin * self)
+{
+  gboolean res = TRUE;
+  GstPad *pad;
+
+  self->download = gst_element_factory_make ("gldownload", NULL);
+  self->convert = gst_element_factory_make ("glcolorconvert", NULL);
+
+  res &= gst_bin_add (GST_BIN (self), self->download);
+  res &= gst_bin_add (GST_BIN (self), self->convert);
+
+  res &= gst_element_link_pads (self->convert, "src", self->download, "sink");
+
+  pad = gst_element_get_static_pad (self->download, "src");
+  if (!pad) {
+    res = FALSE;
+  } else {
+    GST_DEBUG_OBJECT (self, "setting target src pad %" GST_PTR_FORMAT, pad);
+    self->srcpad = gst_ghost_pad_new ("src", pad);
+    gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
+    gst_object_unref (pad);
+  }
+
+  if (!res) {
+    GST_WARNING_OBJECT (self, "Failed to add/connect the necessary machinery");
+  }
+}
+
+static gboolean
+_connect_src_element (GstGLSrcBin * self)
+{
+  gboolean res = TRUE;
+
+  gst_object_set_name (GST_OBJECT (self->src), "src");
+  res &= gst_bin_add (GST_BIN (self), self->src);
+
+  res &= gst_element_link_pads (self->src, "src", self->convert, "sink");
+
+  if (!res)
+    GST_ERROR_OBJECT (self, "Failed to link src element into the pipeline");
+
+  return res;
+}
+
+void
+gst_gl_src_bin_finish_init_with_element (GstGLSrcBin * self,
+    GstElement * element)
+{
+  g_return_if_fail (GST_IS_ELEMENT (element));
+
+  self->src = element;
+
+  if (!_connect_src_element (self)) {
+    gst_object_unref (self->src);
+    self->src = NULL;
+  }
+}
+
+void
+gst_gl_src_bin_finish_init (GstGLSrcBin * self)
+{
+  GstGLSrcBinClass *klass = GST_GL_SRC_BIN_GET_CLASS (self);
+  GstElement *element = NULL;
+
+  if (klass->create_element)
+    element = klass->create_element ();
+
+  if (element)
+    gst_gl_src_bin_finish_init_with_element (self, element);
+}
+
+static void
+gst_gl_src_bin_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstGLSrcBin *self = GST_GL_SRC_BIN (object);
+
+  switch (prop_id) {
+    case PROP_SRC:
+    {
+      GstElement *src = g_value_get_object (value);
+      if (self->src)
+        gst_bin_remove (GST_BIN (self), self->src);
+      self->src = src;
+      if (src)
+        _connect_src_element (self);
+      break;
+    }
+    default:
+      if (self->src)
+        g_object_set_property (G_OBJECT (self->src), pspec->name, value);
+      break;
+  }
+}
+
+static void
+gst_gl_src_bin_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstGLSrcBin *self = GST_GL_SRC_BIN (object);
+
+  switch (prop_id) {
+    case PROP_SRC:
+      g_value_set_object (value, self->src);
+      break;
+    default:
+      if (self->src)
+        g_object_get_property (G_OBJECT (self->src), pspec->name, value);
+      break;
+  }
+}
+
+static GstStateChangeReturn
+gst_gl_src_bin_change_state (GstElement * element, GstStateChange transition)
+{
+  GstGLSrcBin *self = GST_GL_SRC_BIN (element);
+  GstGLSrcBinClass *klass = GST_GL_SRC_BIN_GET_CLASS (self);
+  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+
+  GST_DEBUG ("changing state: %s => %s",
+      gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
+      gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      if (!self->src) {
+        if (klass->create_element)
+          self->src = klass->create_element ();
+
+        if (!self->src)
+          g_signal_emit (element,
+              gst_gl_src_bin_signals[SIGNAL_CREATE_ELEMENT], 0, &self->src);
+
+        if (!self->src) {
+          GST_ERROR_OBJECT (element, "Failed to retreive element");
+          return GST_STATE_CHANGE_FAILURE;
+        }
+        if (!_connect_src_element (self))
+          return GST_STATE_CHANGE_FAILURE;
+      }
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+  if (ret == GST_STATE_CHANGE_FAILURE)
+    return ret;
+
+  switch (transition) {
+    default:
+      break;
+  }
+
+  return ret;
+}

ext/gl/gstglsrcbin.h

@@ -0,0 +1,71 @@
+/*
+ * GStreamer
+ * 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_SRC_BIN_H_
+#define _GST_GL_SRC_BIN_H_
+
+#include <gst/gst.h>
+
+#include <gst/gl/gl.h>
+
+G_BEGIN_DECLS
+
+GType gst_gl_src_bin_get_type(void);
+#define GST_TYPE_GL_SRC_BIN \
+    (gst_gl_src_bin_get_type())
+#define GST_GL_SRC_BIN(obj) \
+    (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_SRC_BIN,GstGLSrcBin))
+#define GST_GL_SRC_BIN_CLASS(klass) \
+    (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_SRC_BIN,GstGLSrcBinClass))
+#define GST_IS_GL_SRC_BIN(obj) \
+    (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_SRC_BIN))
+#define GST_IS_GL_SRC_BIN_CLASS(klass) \
+    (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_SRC_BIN))
+#define GST_GL_SRC_BIN_GET_CLASS(obj) \
+    (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_GL_SRC_BIN,GstGLSrcBinClass))
+
+typedef struct _GstGLSrcBin GstGLSrcBin;
+typedef struct _GstGLSrcBinClass GstGLSrcBinClass;
+
+struct _GstGLSrcBin
+{
+  GstBin parent;
+
+  GstPad *srcpad;
+
+  GstElement *src;
+  GstElement *convert;
+  GstElement *download;
+};
+
+struct _GstGLSrcBinClass
+{
+  GstBinClass parent_class;
+
+  GstElement * (*create_element) (void);
+};
+
+void gst_gl_src_bin_finish_init (GstGLSrcBin * self);
+void gst_gl_src_bin_finish_init_with_element (GstGLSrcBin * self,
+    GstElement * element);
+
+G_END_DECLS
+
+#endif

ext/gl/gstopengl.c

@@ -49,6 +49,7 @@
 #include "gstglcolorconvertelement.h"
 #include "gstglfilterbin.h"
 #include "gstglsinkbin.h"
+#include "gstglsrcbin.h"
 #include "gstglmixerbin.h"
 
 #include "gstglfiltercube.h"
@@ -143,6 +144,11 @@ plugin_init (GstPlugin * plugin)
     return FALSE;
   }
 
+  if (!gst_element_register (plugin, "glsrcbin",
+          GST_RANK_NONE, GST_TYPE_GL_SRC_BIN)) {
+    return FALSE;
+  }
+
   if (!gst_element_register (plugin, "glmixerbin",
           GST_RANK_NONE, GST_TYPE_GL_MIXER_BIN)) {
     return FALSE;