Add new files for gdk_pixbuf based scaler

Original commit message from CVS:
Add new files for gdk_pixbuf based scaler

ChangeLog

+2004-05-15  Jan Schmidt  <thaytan@mad.scientisti.com>
+	* ext/gdk_pixbuf/pixbufscale.c: (gst_pixbufscale_method_get_type),
+	(gst_pixbufscale_get_type), (gst_pixbufscale_base_init),
+	(gst_pixbufscale_class_init), (gst_pixbufscale_getcaps),
+	(gst_pixbufscale_link), (gst_pixbufscale_init),
+	(gst_pixbufscale_handle_src_event), (pixbufscale_scale),
+	(gst_pixbufscale_chain), (gst_pixbufscale_set_property),
+	(gst_pixbufscale_get_property), (pixbufscale_init):
+	* ext/gdk_pixbuf/pixbufscale.h:
+	Add these files I forgot earlier
+
 2004-05-15  Jan Schmidt  <thaytan@mad.scientist.com>
 	* ext/gdk_pixbuf/Makefile.am:
 	* ext/gdk_pixbuf/gstgdkpixbuf.c: (plugin_init):

ext/gdk_pixbuf/pixbufscale.c

+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2004> Jan Schmidt <thaytan@mad.scientist.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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <pixbufscale.h>
+#include <gst/video/video.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+/* debug variable definition */
+GST_DEBUG_CATEGORY (pixbufscale_debug);
+#define GST_CAT_DEFAULT pixbufscale_debug
+
+/* elementfactory information */
+static GstElementDetails pixbufscale_details =
+GST_ELEMENT_DETAILS ("Gdk Pixbuf scaler",
+    "Filter/Effect/Video",
+    "Resizes video",
+    "Jan Schmidt <thaytan@mad.scientist.com>\nWim Taymans <wim.taymans@chello.be>");
+
+/* GstPixbufScale signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+  ARG_METHOD,
+  /* FILL ME */
+};
+
+static GstStaticPadTemplate gst_pixbufscale_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
+    );
+
+static GstStaticPadTemplate gst_pixbufscale_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
+    );
+
+#define GST_TYPE_PIXBUFSCALE_METHOD (gst_pixbufscale_method_get_type())
+static GType
+gst_pixbufscale_method_get_type (void)
+{
+  static GType pixbufscale_method_type = 0;
+  static GEnumValue pixbufscale_methods[] = {
+    {GST_PIXBUFSCALE_NEAREST, "0", "Nearest Neighbour"},
+    {GST_PIXBUFSCALE_TILES, "1", "Tiles"},
+    {GST_PIXBUFSCALE_BILINEAR, "2", "Bilinear"},
+    {GST_PIXBUFSCALE_HYPER, "3", "Hyper"},
+    {0, NULL, NULL},
+  };
+
+  if (!pixbufscale_method_type) {
+    pixbufscale_method_type =
+        g_enum_register_static ("GstPixbufScaleMethod", pixbufscale_methods);
+  }
+  return pixbufscale_method_type;
+}
+
+static void gst_pixbufscale_base_init (gpointer g_class);
+static void gst_pixbufscale_class_init (GstPixbufScaleClass * klass);
+static void gst_pixbufscale_init (GstPixbufScale * pixbufscale);
+static gboolean gst_pixbufscale_handle_src_event (GstPad * pad,
+    GstEvent * event);
+
+static void gst_pixbufscale_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_pixbufscale_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static void gst_pixbufscale_chain (GstPad * pad, GstData * _data);
+
+static GstElementClass *parent_class = NULL;
+
+GType
+gst_pixbufscale_get_type (void)
+{
+  static GType pixbufscale_type = 0;
+
+  if (!pixbufscale_type) {
+    static const GTypeInfo pixbufscale_info = {
+      sizeof (GstPixbufScaleClass),
+      gst_pixbufscale_base_init,
+      NULL,
+      (GClassInitFunc) gst_pixbufscale_class_init,
+      NULL,
+      NULL,
+      sizeof (GstPixbufScale),
+      0,
+      (GInstanceInitFunc) gst_pixbufscale_init,
+    };
+
+    pixbufscale_type =
+        g_type_register_static (GST_TYPE_ELEMENT, "GstPixbufScale",
+        &pixbufscale_info, 0);
+  }
+  return pixbufscale_type;
+}
+
+static void
+gst_pixbufscale_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_set_details (element_class, &pixbufscale_details);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_pixbufscale_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_pixbufscale_sink_template));
+}
+static void
+gst_pixbufscale_class_init (GstPixbufScaleClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_METHOD,
+      g_param_spec_enum ("method", "method", "method",
+          GST_TYPE_PIXBUFSCALE_METHOD, GST_PIXBUFSCALE_BILINEAR,
+          G_PARAM_READWRITE));
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_pixbufscale_set_property;
+  gobject_class->get_property = gst_pixbufscale_get_property;
+}
+
+static GstCaps *
+gst_pixbufscale_getcaps (GstPad * pad)
+{
+  GstPixbufScale *pixbufscale;
+  GstCaps *othercaps;
+  GstCaps *caps;
+  GstPad *otherpad;
+  int i;
+
+  pixbufscale = GST_PIXBUFSCALE (gst_pad_get_parent (pad));
+
+  otherpad = (pad == pixbufscale->srcpad) ? pixbufscale->sinkpad :
+      pixbufscale->srcpad;
+  othercaps = gst_pad_get_allowed_caps (otherpad);
+
+  caps = gst_caps_copy (othercaps);
+  for (i = 0; i < gst_caps_get_size (caps); i++) {
+    GstStructure *structure = gst_caps_get_structure (caps, i);
+
+    gst_structure_set (structure,
+        "width", GST_TYPE_INT_RANGE, 16, G_MAXINT,
+        "height", GST_TYPE_INT_RANGE, 16, G_MAXINT, NULL);
+  }
+
+  GST_DEBUG ("getcaps are: %" GST_PTR_FORMAT, caps);
+  return caps;
+}
+
+static GstPadLinkReturn
+gst_pixbufscale_link (GstPad * pad, const GstCaps * caps)
+{
+  GstPixbufScale *pixbufscale;
+  GstPadLinkReturn ret;
+  GstPad *otherpad;
+  GstStructure *structure;
+  int height, width;
+
+  GST_DEBUG ("gst_pixbufscale_link %s\n", gst_caps_to_string (caps));
+  pixbufscale = GST_PIXBUFSCALE (gst_pad_get_parent (pad));
+
+  otherpad = (pad == pixbufscale->srcpad) ? pixbufscale->sinkpad :
+      pixbufscale->srcpad;
+
+  structure = gst_caps_get_structure (caps, 0);
+  ret = gst_structure_get_int (structure, "width", &width);
+  ret &= gst_structure_get_int (structure, "height", &height);
+
+  ret = gst_pad_try_set_caps (otherpad, caps);
+  if (ret == GST_PAD_LINK_OK) {
+    /* cool, we can use passthru */
+
+    pixbufscale->to_width = width;
+    pixbufscale->to_height = height;
+    pixbufscale->from_width = width;
+    pixbufscale->from_height = height;
+
+    pixbufscale->from_buf_size = width * height * 3;
+    pixbufscale->to_buf_size = width * height * 3;
+
+    pixbufscale->inited = TRUE;
+
+    return GST_PAD_LINK_OK;
+  }
+
+  if (gst_pad_is_negotiated (otherpad)) {
+    GstCaps *newcaps = gst_caps_copy (caps);
+
+    if (pad == pixbufscale->srcpad) {
+      gst_caps_set_simple (newcaps,
+          "width", G_TYPE_INT, pixbufscale->from_width,
+          "height", G_TYPE_INT, pixbufscale->from_height, NULL);
+    } else {
+      gst_caps_set_simple (newcaps,
+          "width", G_TYPE_INT, pixbufscale->to_width,
+          "height", G_TYPE_INT, pixbufscale->to_height, NULL);
+    }
+    ret = gst_pad_try_set_caps (otherpad, newcaps);
+    if (GST_PAD_LINK_FAILED (ret)) {
+      return GST_PAD_LINK_REFUSED;
+    }
+  }
+
+  pixbufscale->passthru = FALSE;
+
+  if (pad == pixbufscale->srcpad) {
+    pixbufscale->to_width = width;
+    pixbufscale->to_height = height;
+  } else {
+    pixbufscale->from_width = width;
+    pixbufscale->from_height = height;
+  }
+
+  if (gst_pad_is_negotiated (otherpad)) {
+    pixbufscale->from_buf_size = pixbufscale->from_width *
+        pixbufscale->from_height * 3;
+    pixbufscale->to_buf_size = pixbufscale->to_width *
+        pixbufscale->to_height * 3;
+    pixbufscale->inited = TRUE;
+  }
+
+  return GST_PAD_LINK_OK;
+}
+
+static void
+gst_pixbufscale_init (GstPixbufScale * pixbufscale)
+{
+  GST_DEBUG_OBJECT (pixbufscale, "_init");
+  pixbufscale->sinkpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&gst_pixbufscale_sink_template), "sink");
+  gst_element_add_pad (GST_ELEMENT (pixbufscale), pixbufscale->sinkpad);
+  gst_pad_set_chain_function (pixbufscale->sinkpad, gst_pixbufscale_chain);
+  gst_pad_set_link_function (pixbufscale->sinkpad, gst_pixbufscale_link);
+  gst_pad_set_getcaps_function (pixbufscale->sinkpad, gst_pixbufscale_getcaps);
+
+  pixbufscale->srcpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&gst_pixbufscale_src_template), "src");
+  gst_element_add_pad (GST_ELEMENT (pixbufscale), pixbufscale->srcpad);
+  gst_pad_set_event_function (pixbufscale->srcpad,
+      gst_pixbufscale_handle_src_event);
+  gst_pad_set_link_function (pixbufscale->srcpad, gst_pixbufscale_link);
+  gst_pad_set_getcaps_function (pixbufscale->srcpad, gst_pixbufscale_getcaps);
+
+  pixbufscale->inited = FALSE;
+
+  pixbufscale->method = GST_PIXBUFSCALE_TILES;
+  pixbufscale->gdk_method = GDK_INTERP_TILES;
+}
+
+static gboolean
+gst_pixbufscale_handle_src_event (GstPad * pad, GstEvent * event)
+{
+  GstPixbufScale *pixbufscale;
+  double a;
+  GstStructure *structure;
+  GstEvent *new_event;
+
+  pixbufscale = GST_PIXBUFSCALE (gst_pad_get_parent (pad));
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_NAVIGATION:
+      structure = gst_structure_copy (event->event_data.structure.structure);
+      if (gst_structure_get_double (event->event_data.structure.structure,
+              "pointer_x", &a)) {
+        gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE,
+            a * pixbufscale->from_width / pixbufscale->to_width, NULL);
+      }
+      if (gst_structure_get_double (event->event_data.structure.structure,
+              "pointer_y", &a)) {
+        gst_structure_set (structure, "pointer_y", G_TYPE_DOUBLE,
+            a * pixbufscale->from_height / pixbufscale->to_height, NULL);
+      }
+      gst_event_unref (event);
+      new_event = gst_event_new (GST_EVENT_NAVIGATION);
+      new_event->event_data.structure.structure = structure;
+      return gst_pad_event_default (pad, new_event);
+      break;
+    default:
+      return gst_pad_event_default (pad, event);
+      break;
+  }
+}
+
+static void
+pixbufscale_scale (GstPixbufScale * scale, unsigned char *dest,
+    unsigned char *src)
+{
+  GdkPixbuf *src_pixbuf, *dest_pixbuf;
+
+  src_pixbuf = gdk_pixbuf_new_from_data
+      (src, GDK_COLORSPACE_RGB, FALSE,
+      8, scale->from_width, scale->from_height,
+      3 * scale->from_width, NULL, NULL);
+  dest_pixbuf = gdk_pixbuf_new_from_data
+      (dest, GDK_COLORSPACE_RGB, FALSE,
+      8, scale->to_width, scale->to_height, 3 * scale->to_width, NULL, NULL);
+  gdk_pixbuf_scale (src_pixbuf, dest_pixbuf, 0, 0, scale->to_width,
+      scale->to_height, 0, 0,
+      (double) scale->to_width / scale->from_width,
+      (double) scale->to_height / scale->from_height, scale->gdk_method);
+
+  dest_pixbuf = gdk_pixbuf_scale_simple
+      (src_pixbuf, scale->to_width, scale->to_height, scale->gdk_method);
+
+  g_object_unref (src_pixbuf);
+  g_object_unref (dest_pixbuf);
+}
+
+static void
+gst_pixbufscale_chain (GstPad * pad, GstData * _data)
+{
+  GstBuffer *buf = GST_BUFFER (_data);
+  GstPixbufScale *pixbufscale;
+  guchar *data;
+  gulong size;
+  GstBuffer *outbuf;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  pixbufscale = GST_PIXBUFSCALE (gst_pad_get_parent (pad));
+  g_return_if_fail (pixbufscale->inited);
+
+  data = GST_BUFFER_DATA (buf);
+  size = GST_BUFFER_SIZE (buf);
+
+  if (pixbufscale->passthru) {
+    GST_LOG_OBJECT (pixbufscale, "passing through buffer of %ld bytes in '%s'",
+        size, GST_OBJECT_NAME (pixbufscale));
+    gst_pad_push (pixbufscale->srcpad, GST_DATA (buf));
+    return;
+  }
+
+  GST_LOG_OBJECT (pixbufscale, "got buffer of %ld bytes in '%s'", size,
+      GST_OBJECT_NAME (pixbufscale));
+  GST_LOG_OBJECT (pixbufscale,
+      "size=%ld from=%dx%d to=%dx%d fromsize=%ld (should be %d) tosize=%d",
+      size, pixbufscale->from_width, pixbufscale->from_height,
+      pixbufscale->to_width, pixbufscale->to_height, size,
+      pixbufscale->from_buf_size, pixbufscale->to_buf_size);
+
+  g_return_if_fail (size == pixbufscale->from_buf_size);
+
+  outbuf = gst_pad_alloc_buffer (pixbufscale->srcpad,
+      GST_BUFFER_OFFSET_NONE, pixbufscale->to_buf_size);
+
+  GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
+
+  pixbufscale_scale (pixbufscale, GST_BUFFER_DATA (outbuf), data);
+
+  GST_DEBUG_OBJECT (pixbufscale, "pushing buffer of %d bytes in '%s'",
+      GST_BUFFER_SIZE (outbuf), GST_OBJECT_NAME (pixbufscale));
+
+  gst_pad_push (pixbufscale->srcpad, GST_DATA (outbuf));
+
+  gst_buffer_unref (buf);
+}
+
+static void
+gst_pixbufscale_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstPixbufScale *src;
+
+  g_return_if_fail (GST_IS_PIXBUFSCALE (object));
+  src = GST_PIXBUFSCALE (object);
+
+  switch (prop_id) {
+    case ARG_METHOD:
+      src->method = g_value_get_enum (value);
+      switch (src->method) {
+        case GST_PIXBUFSCALE_NEAREST:
+          src->gdk_method = GDK_INTERP_NEAREST;
+          break;
+        case GST_PIXBUFSCALE_TILES:
+          src->gdk_method = GDK_INTERP_TILES;
+          break;
+        case GST_PIXBUFSCALE_BILINEAR:
+          src->gdk_method = GDK_INTERP_BILINEAR;
+          break;
+        case GST_PIXBUFSCALE_HYPER:
+          src->gdk_method = GDK_INTERP_HYPER;
+          break;
+      }
+      break;
+    default:
+      break;
+  }
+}
+
+static void
+gst_pixbufscale_get_property (GObject * object, guint prop_id, GValue * value,
+    GParamSpec * pspec)
+{
+  GstPixbufScale *src;
+
+  g_return_if_fail (GST_IS_PIXBUFSCALE (object));
+  src = GST_PIXBUFSCALE (object);
+
+  switch (prop_id) {
+    case ARG_METHOD:
+      g_value_set_enum (value, src->method);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+
+gboolean
+pixbufscale_init (GstPlugin * plugin)
+{
+  if (!gst_element_register (plugin, "pixbufscale", GST_RANK_NONE,
+          GST_TYPE_PIXBUFSCALE))
+    return FALSE;
+
+  GST_DEBUG_CATEGORY_INIT (pixbufscale_debug, "pixbufscale", 0,
+      "pixbufscale element");
+
+  return TRUE;
+}

ext/gdk_pixbuf/pixbufscale.h

+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2004> Jan Schmidt <thaytan@mad.scientist.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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#ifndef __GST_PIXBUFSCALE_H__
+#define __GST_PIXBUFSCALE_H__
+
+#include <gtk/gtk.h>
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+typedef enum {
+  GST_PIXBUFSCALE_NEAREST,
+  GST_PIXBUFSCALE_TILES,
+  GST_PIXBUFSCALE_BILINEAR,
+  GST_PIXBUFSCALE_HYPER
+} GstPixbufScaleMethod;
+
+#define GST_TYPE_PIXBUFSCALE \
+  (gst_pixbufscale_get_type())
+#define GST_PIXBUFSCALE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PIXBUFSCALE,GstPixbufScale))
+#define GST_PIXBUFSCALE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PIXBUFSCALE,GstPixbufScale))
+#define GST_IS_PIXBUFSCALE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PIXBUFSCALE))
+#define GST_IS_PIXBUFSCALE_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PIXBUFSCALE))
+
+typedef struct _GstPixbufScale GstPixbufScale;
+typedef struct _GstPixbufScaleClass GstPixbufScaleClass;
+
+struct _GstPixbufScale {
+  GstElement element;
+
+  GstPad *sinkpad,*srcpad;
+
+  /* video state */
+  gboolean inited;
+  gint to_width;
+  gint to_height;
+  gint from_width;
+  gint from_height;
+  gboolean passthru;
+
+  GstPixbufScaleMethod method;
+  GdkInterpType gdk_method;
+  
+  /* private */
+  gint from_buf_size;
+  gint to_buf_size;
+};
+
+struct _GstPixbufScaleClass {
+  GstElementClass parent_class;
+};
+
+static GType gst_pixbufscale_get_type(void);
+
+G_END_DECLS
+
+#endif /* __GST_PIXBUFSCALE_H__ */