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Added simple video cropping plugin
Original commit message from CVS: Added simple video cropping plugin
This commit is contained in:
Wim Taymans
parent
a805a808b8
commit
47684b4a1a
10
gst/videocrop/Makefile.am
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10
gst/videocrop/Makefile.am
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@ -0,0 +1,10 @@
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plugindir = $(libdir)/gst
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plugin_LTLIBRARIES = libgstvideocrop.la
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libgstvideocrop_la_SOURCES = gstvideocrop.c
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libgstvideocrop_la_CFLAGS = $(GST_CFLAGS)
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libgstvideocrop_la_LIBADD =
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libgstvideocrop_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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noinst_HEADERS =
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419
gst/videocrop/gstvideocrop.c
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419
gst/videocrop/gstvideocrop.c
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@ -0,0 +1,419 @@
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/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <gst/gst.h>
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#include <string.h>
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#define GST_TYPE_VIDEO_CROP \
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(gst_video_crop_get_type())
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#define GST_VIDEO_CROP(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_CROP,GstVideoCrop))
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#define GST_VIDEO_CROP_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_CROP,GstVideoCropClass))
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#define GST_IS_VIDEO_CROP(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_CROP))
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#define GST_IS_VIDEO_CROP_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_CROP))
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typedef struct _GstVideoCrop GstVideoCrop;
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typedef struct _GstVideoCropClass GstVideoCropClass;
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struct _GstVideoCrop {
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GstElement element;
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/* pads */
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GstPad *sinkpad;
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GstPad *srcpad;
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/* caps */
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gint width, height;
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gint crop_x, crop_y;
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gint crop_width, crop_height;
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};
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struct _GstVideoCropClass {
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GstElementClass parent_class;
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};
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/* elementfactory information */
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static GstElementDetails gst_video_crop_details = {
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"video crop filter",
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"Filter/Video/Crop",
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"Crops video into a user defined region",
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VERSION,
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"Wim Taymans <wim.taymans@chello.be>",
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"(C) 2002",
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};
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/* VideoCrop signals and args */
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enum {
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/* FILL ME */
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LAST_SIGNAL
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};
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enum {
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ARG_0,
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ARG_X,
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ARG_Y,
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ARG_WIDTH,
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ARG_HEIGHT,
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/* FILL ME */
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};
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GST_PAD_TEMPLATE_FACTORY (video_crop_src_template_factory,
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"src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"video_crop_src",
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"video/raw",
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"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
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)
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)
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GST_PAD_TEMPLATE_FACTORY (video_crop_sink_template_factory,
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"sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"video_crop_sink",
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"video/raw",
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"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
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)
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)
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static void gst_video_crop_class_init (GstVideoCropClass *klass);
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static void gst_video_crop_init (GstVideoCrop *video_crop);
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static void gst_video_crop_set_property (GObject *object, guint prop_id,
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const GValue *value, GParamSpec *pspec);
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static void gst_video_crop_get_property (GObject *object, guint prop_id,
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GValue *value, GParamSpec *pspec);
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static GstPadConnectReturn
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gst_video_crop_sink_connect (GstPad *pad, GstCaps *caps);
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static void gst_video_crop_chain (GstPad *pad, GstBuffer *buffer);
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static GstElementStateReturn
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gst_video_crop_change_state (GstElement *element);
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static GstElementClass *parent_class = NULL;
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/* static guint gst_video_crop_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_video_crop_get_type (void)
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{
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static GType video_crop_type = 0;
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if (!video_crop_type) {
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static const GTypeInfo video_crop_info = {
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sizeof(GstVideoCropClass),
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NULL,
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NULL,
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(GClassInitFunc)gst_video_crop_class_init,
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NULL,
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NULL,
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sizeof(GstVideoCrop),
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0,
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(GInstanceInitFunc)gst_video_crop_init,
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};
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video_crop_type = g_type_register_static(GST_TYPE_ELEMENT, "GstVideoCrop", &video_crop_info, 0);
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}
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return video_crop_type;
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}
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static void
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gst_video_crop_class_init (GstVideoCropClass *klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass*) klass;
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gstelement_class = (GstElementClass*) klass;
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parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_X,
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g_param_spec_int ("x", "X", "X offset of image",
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0, G_MAXINT, 0, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_Y,
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g_param_spec_int ("y", "Y", "Y offset of image",
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0, G_MAXINT, 0, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_WIDTH,
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g_param_spec_int ("width", "Width", "Width of image",
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0, G_MAXINT, 0, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_HEIGHT,
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g_param_spec_int ("height", "Height", "Height of image",
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0, G_MAXINT, 0, G_PARAM_READWRITE));
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gobject_class->set_property = gst_video_crop_set_property;
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gobject_class->get_property = gst_video_crop_get_property;
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gstelement_class->change_state = gst_video_crop_change_state;
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}
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static void
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gst_video_crop_init (GstVideoCrop *video_crop)
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{
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/* create the sink and src pads */
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video_crop->sinkpad = gst_pad_new_from_template(
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GST_PAD_TEMPLATE_GET (video_crop_sink_template_factory), "sink");
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gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->sinkpad);
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gst_pad_set_chain_function (video_crop->sinkpad, GST_DEBUG_FUNCPTR (gst_video_crop_chain));
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gst_pad_set_connect_function (video_crop->sinkpad, GST_DEBUG_FUNCPTR (gst_video_crop_sink_connect));
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video_crop->srcpad = gst_pad_new_from_template(
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GST_PAD_TEMPLATE_GET (video_crop_src_template_factory), "src");
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gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->srcpad);
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video_crop->crop_x = 0;
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video_crop->crop_y = 0;
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video_crop->crop_width = 128;
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video_crop->crop_height = 128;
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GST_FLAG_SET (video_crop, GST_ELEMENT_EVENT_AWARE);
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}
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/* do we need this function? */
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static void
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gst_video_crop_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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GstVideoCrop *video_crop;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail (GST_IS_VIDEO_CROP (object));
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video_crop = GST_VIDEO_CROP (object);
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switch (prop_id) {
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case ARG_X:
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video_crop->crop_x = g_value_get_int (value);
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break;
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case ARG_Y:
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video_crop->crop_y = g_value_get_int (value);
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break;
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case ARG_WIDTH:
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video_crop->crop_width = g_value_get_int (value);
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break;
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case ARG_HEIGHT:
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video_crop->crop_height = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_video_crop_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstVideoCrop *video_crop;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail (GST_IS_VIDEO_CROP (object));
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video_crop = GST_VIDEO_CROP (object);
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switch (prop_id) {
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case ARG_X:
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g_value_set_int (value, video_crop->crop_x);
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break;
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case ARG_Y:
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g_value_set_int (value, video_crop->crop_y);
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break;
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case ARG_WIDTH:
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g_value_set_int (value, video_crop->crop_width);
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break;
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case ARG_HEIGHT:
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g_value_set_int (value, video_crop->crop_height);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstPadConnectReturn
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gst_video_crop_sink_connect (GstPad *pad, GstCaps *caps)
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{
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GstVideoCrop *video_crop;
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/* we are not going to act on variable caps */
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if (!GST_CAPS_IS_FIXED (caps))
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return GST_PAD_CONNECT_DELAYED;
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video_crop = GST_VIDEO_CROP (gst_pad_get_parent (pad));
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gst_caps_get_int (caps, "width", &video_crop->width);
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gst_caps_get_int (caps, "height", &video_crop->height);
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if (video_crop->crop_width + video_crop->crop_x > video_crop->width)
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video_crop->crop_width = video_crop->width - video_crop->crop_x;
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if (video_crop->crop_height + video_crop->crop_y > video_crop->height)
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video_crop->crop_height = video_crop->height - video_crop->crop_y;
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return GST_PAD_CONNECT_OK;
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}
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static void
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gst_video_crop_i420 (GstVideoCrop *video_crop, GstBuffer *src_buffer, GstBuffer *dest_buffer)
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{
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guint8 *srcY, *srcU, *srcV;
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guint8 *destY, *destU, *destV;
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gint width = video_crop->crop_width;
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gint src_stride = video_crop->width;
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gint frame_size = video_crop->width * video_crop->height;
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gint crop_height;
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gint j;
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srcY = GST_BUFFER_DATA (src_buffer) + (src_stride * video_crop->crop_y + video_crop->crop_x);
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destY = GST_BUFFER_DATA (dest_buffer);
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crop_height = video_crop->crop_height;
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/* copy Y plane first */
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for (j = crop_height; j; j--) {
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memcpy (destY, srcY, width);
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srcY += src_stride;
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destY += width;
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}
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width >>= 1;
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src_stride >>= 1;
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crop_height >>= 1;
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destU = destY;
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destV = destU + ((video_crop->crop_width * crop_height) >> 1);
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srcU = GST_BUFFER_DATA (src_buffer) + frame_size + ((src_stride * video_crop->crop_y + video_crop->crop_x) >> 1);
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srcV = srcU + (frame_size >> 2);
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/* copy U plane */
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for (j = crop_height; j; j--) {
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memcpy (destU, srcU, width);
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srcU += src_stride;
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destU += width;
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}
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/* copy U plane */
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for (j = crop_height; j; j--) {
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memcpy (destV, srcV, width);
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srcV += src_stride;
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destV += width;
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}
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}
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static void
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gst_video_crop_chain (GstPad *pad, GstBuffer *buffer)
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{
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GstVideoCrop *video_crop;
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GstBuffer *outbuf;
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video_crop = GST_VIDEO_CROP (gst_pad_get_parent (pad));
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if (GST_IS_EVENT (buffer)) {
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GstEvent *event = GST_EVENT (buffer);
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switch (GST_EVENT_TYPE (event)) {
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default:
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gst_pad_event_default (pad, event);
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break;
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}
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return;
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}
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if (GST_PAD_CAPS (video_crop->srcpad) == NULL) {
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if (!gst_pad_try_set_caps (video_crop->srcpad,
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GST_CAPS_NEW (
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"video_crop_caps",
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"video/raw",
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"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420")),
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"width", GST_PROPS_INT (video_crop->crop_width),
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"height", GST_PROPS_INT (video_crop->crop_height)
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)))
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{
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gst_element_error (GST_ELEMENT (video_crop), "could not negotiate pads");
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return;
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}
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}
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outbuf = gst_buffer_new_and_alloc ((video_crop->crop_width * video_crop->crop_height * 3) / 2);
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GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
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gst_video_crop_i420 (video_crop, buffer, outbuf);
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gst_buffer_unref (buffer);
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gst_pad_push (video_crop->srcpad, outbuf);
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}
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static GstElementStateReturn
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gst_video_crop_change_state (GstElement *element)
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{
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GstVideoCrop *video_crop;
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video_crop = GST_VIDEO_CROP (element);
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switch (GST_STATE_TRANSITION (element)) {
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case GST_STATE_NULL_TO_READY:
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break;
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case GST_STATE_READY_TO_PAUSED:
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break;
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case GST_STATE_PAUSED_TO_PLAYING:
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break;
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case GST_STATE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_PAUSED_TO_READY:
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break;
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case GST_STATE_READY_TO_NULL:
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break;
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}
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parent_class->change_state (element);
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return GST_STATE_SUCCESS;
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}
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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GstElementFactory *factory;
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/* create an elementfactory for the videocrop element */
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factory = gst_element_factory_new ("videocrop", GST_TYPE_VIDEO_CROP, &gst_video_crop_details);
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g_return_val_if_fail (factory != NULL, FALSE);
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gst_element_factory_add_pad_template (factory,
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GST_PAD_TEMPLATE_GET (video_crop_sink_template_factory));
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gst_element_factory_add_pad_template (factory,
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GST_PAD_TEMPLATE_GET (video_crop_src_template_factory));
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gst_element_factory_set_rank (factory, GST_ELEMENT_RANK_PRIMARY);
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"videocrop",
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plugin_init
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};
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