gstreamer/gst/videocrop/gstvideocrop.c
Wim Taymans 47684b4a1a Added simple video cropping plugin
Original commit message from CVS:
Added simple video cropping plugin
2002-07-22 22:08:28 +00:00

419 lines
12 KiB
C

/* 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
};