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authorWim Taymans <wim.taymans@gmail.com>2002-07-22 22:08:28 +0000
committerWim Taymans <wim.taymans@gmail.com>2002-07-22 22:08:28 +0000
commit47684b4a1a6b331292560a09e577ea657154b914 (patch)
treedcb2c5473653276c546b2c4b798dd68e2642be8b /gst
parenta805a808b83639a76d7ae0cce58606b5e736138f (diff)
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Added simple video cropping plugin
Original commit message from CVS: Added simple video cropping plugin
Diffstat (limited to 'gst')
-rw-r--r--gst/videocrop/Makefile.am10
-rw-r--r--gst/videocrop/gstvideocrop.c419
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
+};