gst/alpha/: Stupid plugin to to RGBA to AYUV conversion because none of the colorspace plugins can handle that yet.

Original commit message from CVS:
* gst/alpha/Makefile.am:
* gst/alpha/gstalphacolor.c: (gst_alpha_color_get_type),
(gst_alpha_color_base_init), (gst_alpha_color_class_init),
(gst_alpha_color_init), (gst_alpha_color_set_property),
(gst_alpha_color_get_property), (gst_alpha_color_sink_link),
(transform), (gst_alpha_color_chain),
(gst_alpha_color_change_state), (plugin_init):
Stupid plugin to to RGBA to AYUV conversion because none of
the colorspace plugins can handle that yet.

2 files changed, 350 insertions, 1 deletions

diff --git a/gst/alpha/Makefile.am b/gst/alpha/Makefile.am
index cd908f9d..e3c51b9e 100644
--- a/gst/alpha/Makefile.am
+++ b/gst/alpha/Makefile.am
@@ -1,9 +1,14 @@
 
-plugin_LTLIBRARIES = libgstalpha.la
+plugin_LTLIBRARIES = libgstalpha.la libgstalphacolor.la
 
 libgstalpha_la_SOURCES = gstalpha.c
 libgstalpha_la_CFLAGS = $(GST_CFLAGS)
 libgstalpha_la_LIBADD =
 libgstalpha_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 
+libgstalphacolor_la_SOURCES = gstalphacolor.c
+libgstalphacolor_la_CFLAGS = $(GST_CFLAGS)
+libgstalphacolor_la_LIBADD =
+libgstalphacolor_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+
 noinst_HEADERS = 
diff --git a/gst/alpha/gstalphacolor.c b/gst/alpha/gstalphacolor.c
new file mode 100644
index 00000000..69cb8ef8
--- /dev/null
+++ b/gst/alpha/gstalphacolor.c
@@ -0,0 +1,344 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <gst/gst.h>
+#include <gst/video/video.h>
+
+#include <string.h>
+
+#define GST_TYPE_ALPHA_COLOR \
+  (gst_alpha_color_get_type())
+#define GST_ALPHA_COLOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALPHA_COLOR,GstAlphaColor))
+#define GST_ALPHA_COLOR_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALPHA_COLOR,GstAlphaColorClass))
+#define GST_IS_ALPHA_COLOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALPHA_COLOR))
+#define GST_IS_ALPHA_COLOR_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALPHA_COLOR))
+
+typedef struct _GstAlphaColor GstAlphaColor;
+typedef struct _GstAlphaColorClass GstAlphaColorClass;
+
+struct _GstAlphaColor
+{
+  GstElement element;
+
+  /* pads */
+  GstPad *sinkpad;
+  GstPad *srcpad;
+
+  /* caps */
+  gint in_width, in_height;
+  gint out_width, out_height;
+};
+
+struct _GstAlphaColorClass
+{
+  GstElementClass parent_class;
+};
+
+/* elementfactory information */
+static GstElementDetails gst_alpha_color_details =
+GST_ELEMENT_DETAILS ("alpha color filter",
+    "Filter/Effect/Video",
+    "converts rgb to yuv with alpha",
+    "Wim Taymans <wim@fluendo.com>");
+
+
+/* AlphaColor signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+  /* FILL ME */
+};
+
+static GstStaticPadTemplate gst_alpha_color_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA)
+    );
+
+static GstStaticPadTemplate gst_alpha_color_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV"))
+    );
+
+
+static void gst_alpha_color_base_init (gpointer g_class);
+static void gst_alpha_color_class_init (GstAlphaColorClass * klass);
+static void gst_alpha_color_init (GstAlphaColor * alpha);
+
+static void gst_alpha_color_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_alpha_color_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static GstPadLinkReturn
+gst_alpha_color_sink_link (GstPad * pad, const GstCaps * caps);
+static void gst_alpha_color_chain (GstPad * pad, GstData * _data);
+
+static GstElementStateReturn gst_alpha_color_change_state (GstElement *
+    element);
+
+
+static GstElementClass *parent_class = NULL;
+
+/* static guint gst_alpha_color_signals[LAST_SIGNAL] = { 0 }; */
+
+GType
+gst_alpha_color_get_type (void)
+{
+  static GType alpha_type = 0;
+
+  if (!alpha_type) {
+    static const GTypeInfo alpha_info = {
+      sizeof (GstAlphaColorClass),
+      gst_alpha_color_base_init,
+      NULL,
+      (GClassInitFunc) gst_alpha_color_class_init,
+      NULL,
+      NULL,
+      sizeof (GstAlphaColor),
+      0,
+      (GInstanceInitFunc) gst_alpha_color_init,
+    };
+
+    alpha_type =
+        g_type_register_static (GST_TYPE_ELEMENT, "GstAlphaColor", &alpha_info,
+        0);
+  }
+  return alpha_type;
+}
+
+static void
+gst_alpha_color_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_set_details (element_class, &gst_alpha_color_details);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_alpha_color_sink_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_alpha_color_src_template));
+}
+static void
+gst_alpha_color_class_init (GstAlphaColorClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_alpha_color_set_property;
+  gobject_class->get_property = gst_alpha_color_get_property;
+
+  gstelement_class->change_state = gst_alpha_color_change_state;
+}
+
+static void
+gst_alpha_color_init (GstAlphaColor * alpha)
+{
+  /* create the sink and src pads */
+  alpha->sinkpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&gst_alpha_color_sink_template), "sink");
+  gst_element_add_pad (GST_ELEMENT (alpha), alpha->sinkpad);
+  gst_pad_set_chain_function (alpha->sinkpad, gst_alpha_color_chain);
+  gst_pad_set_link_function (alpha->sinkpad, gst_alpha_color_sink_link);
+
+  alpha->srcpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&gst_alpha_color_src_template), "src");
+  gst_element_add_pad (GST_ELEMENT (alpha), alpha->srcpad);
+
+  GST_FLAG_SET (alpha, GST_ELEMENT_EVENT_AWARE);
+}
+
+/* do we need this function? */
+static void
+gst_alpha_color_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstAlphaColor *alpha;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_ALPHA_COLOR (object));
+
+  alpha = GST_ALPHA_COLOR (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+static void
+gst_alpha_color_get_property (GObject * object, guint prop_id, GValue * value,
+    GParamSpec * pspec)
+{
+  GstAlphaColor *alpha;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_ALPHA_COLOR (object));
+
+  alpha = GST_ALPHA_COLOR (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstPadLinkReturn
+gst_alpha_color_sink_link (GstPad * pad, const GstCaps * caps)
+{
+  GstAlphaColor *alpha;
+  GstStructure *structure;
+  gboolean ret;
+  gdouble fps;
+
+  alpha = GST_ALPHA_COLOR (gst_pad_get_parent (pad));
+  structure = gst_caps_get_structure (caps, 0);
+
+  ret = gst_structure_get_int (structure, "width", &alpha->in_width);
+  ret &= gst_structure_get_int (structure, "height", &alpha->in_height);
+  ret &= gst_structure_get_double (structure, "framerate", &fps);
+
+  if (!ret)
+    return GST_PAD_LINK_REFUSED;
+
+  caps = gst_caps_new_simple ("video/x-raw-yuv",
+      "format", GST_TYPE_FOURCC, GST_STR_FOURCC ("AYUV"),
+      "framerate", G_TYPE_DOUBLE, fps,
+      "width", G_TYPE_INT, alpha->in_width,
+      "height", G_TYPE_INT, alpha->in_height, NULL);
+
+  return gst_pad_try_set_caps (alpha->srcpad, caps);
+}
+
+static void
+transform (guint8 * data, gint size)
+{
+  guint8 y, u, v;
+
+  while (size > 0) {
+    y = data[0] * 0.299 + data[1] * 0.587 + data[2] * 0.114 + 0;
+    u = data[0] * -0.169 + data[1] * -0.332 + data[2] * 0.500 + 128;
+    v = data[0] * 0.500 + data[1] * -0.419 + data[2] * -0.0813 + 128;
+
+    data[0] = data[3];
+    data[1] = y;
+    data[2] = u;
+    data[3] = v;
+
+    data += 4;
+    size -= 4;
+  }
+}
+
+static void
+gst_alpha_color_chain (GstPad * pad, GstData * _data)
+{
+  GstBuffer *buffer;
+  GstAlphaColor *alpha;
+  GstBuffer *outbuf;
+  gint width, height;
+
+  alpha = GST_ALPHA_COLOR (gst_pad_get_parent (pad));
+
+  if (GST_IS_EVENT (_data)) {
+    GstEvent *event = GST_EVENT (_data);
+
+    switch (GST_EVENT_TYPE (event)) {
+      default:
+        gst_pad_event_default (pad, event);
+        break;
+    }
+    return;
+  }
+
+  buffer = GST_BUFFER (_data);
+
+  width = alpha->in_width;
+  height = alpha->in_height;
+
+  outbuf = gst_buffer_copy_on_write (buffer);
+
+  transform (GST_BUFFER_DATA (outbuf), GST_BUFFER_SIZE (outbuf));
+
+  gst_pad_push (alpha->srcpad, GST_DATA (outbuf));
+}
+
+static GstElementStateReturn
+gst_alpha_color_change_state (GstElement * element)
+{
+  GstAlphaColor *alpha;
+
+  alpha = GST_ALPHA_COLOR (element);
+
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_NULL_TO_READY:
+      break;
+    case GST_STATE_READY_TO_PAUSED:
+      break;
+    case GST_STATE_PAUSED_TO_PLAYING:
+      break;
+    case GST_STATE_PLAYING_TO_PAUSED:
+      break;
+    case GST_STATE_PAUSED_TO_READY:
+      break;
+    case GST_STATE_READY_TO_NULL:
+      break;
+  }
+
+  parent_class->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "alphacolor", GST_RANK_NONE,
+      GST_TYPE_ALPHA_COLOR);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "alphacolor",
+    "colorspace conversion preserving the alpha channels",
+    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)