Added simple video cropping plugin

Original commit message from CVS:
Added simple video cropping plugin

2 files changed, 429 insertions, 0 deletions

diff --git a/gst/videocrop/Makefile.am b/gst/videocrop/Makefile.am
new file mode 100644
index 00000000..f881428b
--- /dev/null
+++ b/gst/videocrop/Makefile.am
@@ -0,0 +1,10 @@
+plugindir = $(libdir)/gst
+
+plugin_LTLIBRARIES = libgstvideocrop.la
+
+libgstvideocrop_la_SOURCES = gstvideocrop.c
+libgstvideocrop_la_CFLAGS = $(GST_CFLAGS)
+libgstvideocrop_la_LIBADD =
+libgstvideocrop_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+
+noinst_HEADERS = 
diff --git a/gst/videocrop/gstvideocrop.c b/gst/videocrop/gstvideocrop.c
new file mode 100644
index 00000000..d1cc5af4
--- /dev/null
+++ b/gst/videocrop/gstvideocrop.c
@@ -0,0 +1,419 @@
+/* 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.
+ */
+
+#include <gst/gst.h>
+
+#include <string.h>
+
+#define GST_TYPE_VIDEO_CROP \
+  (gst_video_crop_get_type())
+#define GST_VIDEO_CROP(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_CROP,GstVideoCrop))
+#define GST_VIDEO_CROP_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_CROP,GstVideoCropClass))
+#define GST_IS_VIDEO_CROP(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_CROP))
+#define GST_IS_VIDEO_CROP_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_CROP))
+
+typedef struct _GstVideoCrop GstVideoCrop;
+typedef struct _GstVideoCropClass GstVideoCropClass;
+
+struct _GstVideoCrop {
+  GstElement 	 element;
+
+  /* pads */
+  GstPad 	*sinkpad;
+  GstPad	*srcpad;
+
+  /* caps */
+  gint		 width, height;
+  gint		 crop_x, crop_y;
+  gint		 crop_width, crop_height;
+};
+
+struct _GstVideoCropClass {
+  GstElementClass parent_class;
+};
+
+/* elementfactory information */
+static GstElementDetails gst_video_crop_details = {
+  "video crop filter",
+  "Filter/Video/Crop",
+  "Crops video into a user defined region",
+  VERSION,
+  "Wim Taymans <wim.taymans@chello.be>",
+  "(C) 2002",
+};
+
+
+/* VideoCrop signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  ARG_X,
+  ARG_Y,
+  ARG_WIDTH,
+  ARG_HEIGHT,
+  /* FILL ME */
+};
+
+GST_PAD_TEMPLATE_FACTORY (video_crop_src_template_factory,
+  "src",
+  GST_PAD_SRC,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW (
+    "video_crop_src",
+    "video/raw",
+      "format",   GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
+  )
+)
+
+GST_PAD_TEMPLATE_FACTORY (video_crop_sink_template_factory,
+  "sink",
+  GST_PAD_SINK,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW (
+    "video_crop_sink",
+    "video/raw",
+      "format",   GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
+  )
+)
+
+
+static void 		gst_video_crop_class_init	(GstVideoCropClass *klass);
+static void 		gst_video_crop_init		(GstVideoCrop *video_crop);
+
+static void		gst_video_crop_set_property	(GObject *object, guint prop_id, 
+							 const GValue *value, GParamSpec *pspec);
+static void		gst_video_crop_get_property	(GObject *object, guint prop_id, 
+							 GValue *value, GParamSpec *pspec);
+
+static GstPadConnectReturn
+			gst_video_crop_sink_connect 	(GstPad *pad, GstCaps *caps);
+static void 		gst_video_crop_chain 		(GstPad *pad, GstBuffer *buffer);
+
+static GstElementStateReturn
+			gst_video_crop_change_state	(GstElement *element);
+
+
+static GstElementClass *parent_class = NULL;
+/* static guint gst_video_crop_signals[LAST_SIGNAL] = { 0 }; */
+
+GType
+gst_video_crop_get_type (void)
+{
+  static GType video_crop_type = 0;
+
+  if (!video_crop_type) {
+    static const GTypeInfo video_crop_info = {
+      sizeof(GstVideoCropClass),      
+      NULL,
+      NULL,
+      (GClassInitFunc)gst_video_crop_class_init,
+      NULL,
+      NULL,
+      sizeof(GstVideoCrop),
+      0,
+      (GInstanceInitFunc)gst_video_crop_init,
+    };
+    video_crop_type = g_type_register_static(GST_TYPE_ELEMENT, "GstVideoCrop", &video_crop_info, 0);
+  }
+  return video_crop_type;
+}
+
+static void
+gst_video_crop_class_init (GstVideoCropClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*) klass;
+  gstelement_class = (GstElementClass*) klass;
+
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_X,
+    g_param_spec_int ("x", "X", "X offset of image",
+		      0, G_MAXINT, 0, G_PARAM_READWRITE));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_Y,
+    g_param_spec_int ("y", "Y", "Y offset of image",
+		      0, G_MAXINT, 0, G_PARAM_READWRITE));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_WIDTH,
+    g_param_spec_int ("width", "Width", "Width of image",
+		      0, G_MAXINT, 0, G_PARAM_READWRITE));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_HEIGHT,
+    g_param_spec_int ("height", "Height", "Height of image",
+		      0, G_MAXINT, 0, G_PARAM_READWRITE));
+
+  gobject_class->set_property = gst_video_crop_set_property;
+  gobject_class->get_property = gst_video_crop_get_property;
+
+  gstelement_class->change_state = gst_video_crop_change_state;
+}
+
+static void
+gst_video_crop_init (GstVideoCrop *video_crop)
+{
+  /* create the sink and src pads */
+  video_crop->sinkpad = gst_pad_new_from_template(
+		  GST_PAD_TEMPLATE_GET (video_crop_sink_template_factory), "sink");
+  gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->sinkpad);
+  gst_pad_set_chain_function (video_crop->sinkpad, GST_DEBUG_FUNCPTR (gst_video_crop_chain));
+  gst_pad_set_connect_function (video_crop->sinkpad, GST_DEBUG_FUNCPTR (gst_video_crop_sink_connect));
+
+  video_crop->srcpad = gst_pad_new_from_template(
+		  GST_PAD_TEMPLATE_GET (video_crop_src_template_factory), "src");
+  gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->srcpad);
+
+  video_crop->crop_x = 0;
+  video_crop->crop_y = 0;
+  video_crop->crop_width = 128;
+  video_crop->crop_height = 128;
+
+  GST_FLAG_SET (video_crop, GST_ELEMENT_EVENT_AWARE);
+}
+
+/* do we need this function? */
+static void
+gst_video_crop_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstVideoCrop *video_crop;
+	    
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_VIDEO_CROP (object));
+	      
+  video_crop = GST_VIDEO_CROP (object);
+
+  switch (prop_id) {
+    case ARG_X:
+      video_crop->crop_x = g_value_get_int (value);
+      break;
+    case ARG_Y:
+      video_crop->crop_y = g_value_get_int (value);
+      break;
+    case ARG_WIDTH:
+      video_crop->crop_width = g_value_get_int (value);
+      break;
+    case ARG_HEIGHT:
+      video_crop->crop_height = g_value_get_int (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+static void
+gst_video_crop_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  GstVideoCrop *video_crop;
+	    
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_VIDEO_CROP (object));
+	      
+  video_crop = GST_VIDEO_CROP (object);
+
+  switch (prop_id) {
+    case ARG_X:
+      g_value_set_int (value, video_crop->crop_x);
+      break;
+    case ARG_Y:
+      g_value_set_int (value, video_crop->crop_y);
+      break;
+    case ARG_WIDTH:
+      g_value_set_int (value, video_crop->crop_width);
+      break;
+    case ARG_HEIGHT:
+      g_value_set_int (value, video_crop->crop_height);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstPadConnectReturn
+gst_video_crop_sink_connect (GstPad *pad, GstCaps *caps)
+{
+  GstVideoCrop *video_crop;
+
+  /* we are not going to act on variable caps */
+  if (!GST_CAPS_IS_FIXED (caps))
+    return GST_PAD_CONNECT_DELAYED;
+
+  video_crop = GST_VIDEO_CROP (gst_pad_get_parent (pad));
+
+  gst_caps_get_int (caps, "width",  &video_crop->width);
+  gst_caps_get_int (caps, "height", &video_crop->height);
+
+  if (video_crop->crop_width + video_crop->crop_x > video_crop->width)
+    video_crop->crop_width = video_crop->width - video_crop->crop_x;
+  if (video_crop->crop_height + video_crop->crop_y > video_crop->height)
+    video_crop->crop_height = video_crop->height - video_crop->crop_y;
+
+  return GST_PAD_CONNECT_OK;
+}
+
+static void
+gst_video_crop_i420 (GstVideoCrop *video_crop, GstBuffer *src_buffer, GstBuffer *dest_buffer)
+{
+  guint8 *srcY, *srcU, *srcV;
+  guint8 *destY, *destU, *destV;
+  gint width = video_crop->crop_width;
+  gint src_stride = video_crop->width;
+  gint frame_size = video_crop->width * video_crop->height;
+  gint crop_height;
+  gint j;
+
+  srcY = GST_BUFFER_DATA (src_buffer) + (src_stride * video_crop->crop_y + video_crop->crop_x);
+  destY = GST_BUFFER_DATA (dest_buffer);
+
+  crop_height = video_crop->crop_height;
+
+  /* copy Y plane first */
+  for (j = crop_height; j; j--) {
+    memcpy (destY, srcY, width);
+    srcY += src_stride;
+    destY += width;
+  }
+
+  width >>= 1;
+  src_stride >>= 1;
+  crop_height >>= 1;
+
+  destU = destY;
+  destV = destU + ((video_crop->crop_width * crop_height) >> 1);
+
+  srcU = GST_BUFFER_DATA (src_buffer) + frame_size + ((src_stride * video_crop->crop_y + video_crop->crop_x) >> 1);
+  srcV = srcU + (frame_size >> 2);
+
+  /* copy U plane */
+  for (j = crop_height; j; j--) {
+    memcpy (destU, srcU, width);
+    srcU += src_stride;
+    destU += width;
+  }
+  /* copy U plane */
+  for (j = crop_height; j; j--) {
+    memcpy (destV, srcV, width);
+    srcV += src_stride;
+    destV += width;
+  }
+}
+
+static void
+gst_video_crop_chain (GstPad *pad, GstBuffer *buffer)
+{
+  GstVideoCrop *video_crop;
+  GstBuffer *outbuf;
+
+  video_crop = GST_VIDEO_CROP (gst_pad_get_parent (pad));
+
+  if (GST_IS_EVENT (buffer)) {
+    GstEvent *event = GST_EVENT (buffer);
+
+    switch (GST_EVENT_TYPE (event)) {
+      default:
+	gst_pad_event_default (pad, event);
+	break;
+    }
+    return;
+  }
+
+  if (GST_PAD_CAPS (video_crop->srcpad) == NULL) {
+    if (!gst_pad_try_set_caps (video_crop->srcpad,
+			       GST_CAPS_NEW (
+				       "video_crop_caps",
+				       "video/raw",
+				        "format",   GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
+				         "width",   GST_PROPS_INT (video_crop->crop_width),
+				         "height",  GST_PROPS_INT (video_crop->crop_height)
+				       )))
+    {
+      gst_element_error (GST_ELEMENT (video_crop), "could not negotiate pads");
+      return;
+    }
+  }
+
+  outbuf = gst_buffer_new_and_alloc ((video_crop->crop_width * video_crop->crop_height * 3) / 2);
+  GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
+
+  gst_video_crop_i420 (video_crop, buffer, outbuf);
+  gst_buffer_unref (buffer);
+
+  gst_pad_push (video_crop->srcpad, outbuf);
+}
+
+static GstElementStateReturn
+gst_video_crop_change_state (GstElement *element)
+{
+  GstVideoCrop *video_crop;
+
+  video_crop = GST_VIDEO_CROP (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 (GModule *module, GstPlugin *plugin)
+{
+  GstElementFactory *factory;
+
+  /* create an elementfactory for the videocrop element */
+  factory = gst_element_factory_new ("videocrop", GST_TYPE_VIDEO_CROP, &gst_video_crop_details);
+  g_return_val_if_fail (factory != NULL, FALSE);
+
+  gst_element_factory_add_pad_template (factory, 
+		  GST_PAD_TEMPLATE_GET (video_crop_sink_template_factory));
+  gst_element_factory_add_pad_template (factory, 
+		  GST_PAD_TEMPLATE_GET (video_crop_src_template_factory));
+  gst_element_factory_set_rank (factory, GST_ELEMENT_RANK_PRIMARY);
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "videocrop",
+  plugin_init
+};