gstreamer/gst/videocrop/gstvideocrop.c

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/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.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_left, crop_right, crop_top, crop_bottom;
gboolean renegotiate_src_caps;
};
struct _GstVideoCropClass
{
GstElementClass parent_class;
};
/* elementfactory information */
static GstElementDetails gst_video_crop_details =
GST_ELEMENT_DETAILS ("video crop filter",
"Filter/Effect/Video",
"Crops video into a user defined region",
"Wim Taymans <wim.taymans@chello.be>");
/* VideoCrop args */
enum
{
ARG_0,
ARG_LEFT,
ARG_RIGHT,
ARG_TOP,
ARG_BOTTOM
/* FILL ME */
};
static GstStaticPadTemplate gst_video_crop_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate gst_video_crop_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static void gst_video_crop_base_init (gpointer g_class);
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 GstCaps *gst_video_crop_getcaps (GstPad * pad);
static GstPadLinkReturn
gst_video_crop_link (GstPad * pad, const GstCaps * caps);
static void gst_video_crop_chain (GstPad * pad, GstData * _data);
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),
gst_video_crop_base_init,
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_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_video_crop_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_crop_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_crop_src_template));
}
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_LEFT,
g_param_spec_int ("left", "Left", "Pixels to crop at left",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_RIGHT,
g_param_spec_int ("right", "Right", "Pixels to crop at right",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TOP,
g_param_spec_int ("top", "Top", "Pixels to crop at top",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BOTTOM,
g_param_spec_int ("bottom", "Bottom", "Pixels to crop at bottom",
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_static_pad_template_get
(&gst_video_crop_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->sinkpad);
gst_pad_set_chain_function (video_crop->sinkpad, gst_video_crop_chain);
gst_pad_set_getcaps_function (video_crop->sinkpad, gst_video_crop_getcaps);
gst_pad_set_link_function (video_crop->sinkpad, gst_video_crop_link);
video_crop->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_video_crop_src_template), "src");
gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->srcpad);
gst_pad_set_getcaps_function (video_crop->srcpad, gst_video_crop_getcaps);
gst_pad_set_link_function (video_crop->srcpad, gst_video_crop_link);
video_crop->crop_right = 0;
video_crop->crop_left = 0;
video_crop->crop_top = 0;
video_crop->crop_bottom = 0;
}
/* 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;
g_return_if_fail (GST_IS_VIDEO_CROP (object));
video_crop = GST_VIDEO_CROP (object);
switch (prop_id) {
case ARG_LEFT:
video_crop->crop_left = g_value_get_int (value);
break;
case ARG_RIGHT:
video_crop->crop_right = g_value_get_int (value);
break;
case ARG_TOP:
video_crop->crop_top = g_value_get_int (value);
break;
case ARG_BOTTOM:
video_crop->crop_bottom = 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;
g_return_if_fail (GST_IS_VIDEO_CROP (object));
video_crop = GST_VIDEO_CROP (object);
switch (prop_id) {
case ARG_LEFT:
g_value_set_int (value, video_crop->crop_left);
break;
case ARG_RIGHT:
g_value_set_int (value, video_crop->crop_right);
break;
case ARG_TOP:
g_value_set_int (value, video_crop->crop_top);
break;
case ARG_BOTTOM:
g_value_set_int (value, video_crop->crop_bottom);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
if (gst_pad_is_negotiated (video_crop->srcpad))
video_crop->renegotiate_src_caps = TRUE;
}
static void
gst_video_crop_add_to_struct_val (GstStructure * s, const gchar * field_name,
gint addval)
{
const GValue *val;
val = gst_structure_get_value (s, field_name);
if (G_VALUE_HOLDS_INT (val)) {
gint ival = g_value_get_int (val);
gst_structure_set (s, field_name, G_TYPE_INT, ival + addval, NULL);
return;
}
if (GST_VALUE_HOLDS_INT_RANGE (val)) {
gint min = gst_value_get_int_range_min (val);
gint max = gst_value_get_int_range_max (val);
gst_structure_set (s, field_name, GST_TYPE_INT_RANGE, min + addval,
max + addval, NULL);
return;
}
if (GST_VALUE_HOLDS_LIST (val)) {
GValue newlist = { 0, };
gint i;
g_value_init (&newlist, GST_TYPE_LIST);
for (i = 0; i < gst_value_list_get_size (val); ++i) {
GValue newval = { 0, };
g_value_init (&newval, G_VALUE_TYPE (val));
g_value_copy (val, &newval);
if (G_VALUE_HOLDS_INT (val)) {
gint ival = g_value_get_int (val);
g_value_set_int (&newval, ival + addval);
} else if (GST_VALUE_HOLDS_INT_RANGE (val)) {
gint min = gst_value_get_int_range_min (val);
gint max = gst_value_get_int_range_max (val);
gst_value_set_int_range (&newval, min + addval, max + addval);
} else {
g_return_if_reached ();
}
gst_value_list_append_value (&newlist, &newval);
g_value_unset (&newval);
}
gst_structure_set_value (s, field_name, &newlist);
g_value_unset (&newlist);
return;
}
g_return_if_reached ();
}
static GstCaps *
gst_video_crop_getcaps (GstPad * pad)
{
GstVideoCrop *vc;
GstCaps *othercaps, *caps;
GstPad *otherpad;
gint i, delta_w, delta_h;
vc = GST_VIDEO_CROP (gst_pad_get_parent (pad));
otherpad = (pad == vc->srcpad) ? vc->sinkpad : vc->srcpad;
othercaps = gst_pad_get_allowed_caps (otherpad);
GST_DEBUG_OBJECT (pad, "othercaps of otherpad %s:%s are: %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (otherpad), othercaps);
if (pad == vc->srcpad) {
delta_w = 0 - vc->crop_left - vc->crop_right;
delta_h = 0 - vc->crop_top - vc->crop_bottom;
} else {
delta_w = vc->crop_left + vc->crop_right;
delta_h = vc->crop_top + vc->crop_bottom;
}
for (i = 0; i < gst_caps_get_size (othercaps); i++) {
GstStructure *s = gst_caps_get_structure (othercaps, i);
gst_video_crop_add_to_struct_val (s, "width", delta_w);
gst_video_crop_add_to_struct_val (s, "height", delta_h);
}
caps = gst_caps_intersect (othercaps, gst_pad_get_pad_template_caps (pad));
gst_caps_free (othercaps);
GST_DEBUG_OBJECT (pad, "returning caps: %" GST_PTR_FORMAT, caps);
return caps;
}
static GstPadLinkReturn
gst_video_crop_link (GstPad * pad, const GstCaps * caps)
{
GstPadLinkReturn ret;
GstStructure *structure;
GstVideoCrop *vc;
GstCaps *newcaps;
GstPad *otherpad;
gint w, h, other_w, other_h;
vc = GST_VIDEO_CROP (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "width", &w)
|| !gst_structure_get_int (structure, "height", &h))
return GST_PAD_LINK_DELAYED;
if (pad == vc->srcpad) {
other_w = w + vc->crop_left + vc->crop_right;
other_h = h + vc->crop_top + vc->crop_bottom;
otherpad = vc->sinkpad;
vc->width = other_w;
vc->height = other_h;
} else {
other_w = w - vc->crop_left - vc->crop_right;
other_h = h - vc->crop_top - vc->crop_bottom;
vc->width = w;
vc->height = h;
otherpad = vc->srcpad;
}
newcaps = gst_caps_copy (caps);
gst_caps_set_simple (newcaps,
"width", G_TYPE_INT, other_w, "height", G_TYPE_INT, other_h, NULL);
ret = gst_pad_try_set_caps (otherpad, newcaps);
gst_caps_free (newcaps);
if (ret == GST_PAD_LINK_REFUSED)
return GST_PAD_LINK_REFUSED;
return GST_PAD_LINK_OK;
}
/* these macros are adapted from videotestsrc.c, paint_setup_I420() */
#define ROUND_UP_2(x) (((x)+1)&~1)
#define ROUND_UP_4(x) (((x)+3)&~3)
#define ROUND_UP_8(x) (((x)+7)&~7)
#define GST_VIDEO_I420_Y_ROWSTRIDE(width) (ROUND_UP_4(width))
#define GST_VIDEO_I420_U_ROWSTRIDE(width) (ROUND_UP_8(width)/2)
#define GST_VIDEO_I420_V_ROWSTRIDE(width) ((ROUND_UP_8(GST_VIDEO_I420_Y_ROWSTRIDE(width)))/2)
#define GST_VIDEO_I420_Y_OFFSET(w,h) (0)
#define GST_VIDEO_I420_U_OFFSET(w,h) (GST_VIDEO_I420_Y_OFFSET(w,h)+(GST_VIDEO_I420_Y_ROWSTRIDE(w)*ROUND_UP_2(h)))
#define GST_VIDEO_I420_V_OFFSET(w,h) (GST_VIDEO_I420_U_OFFSET(w,h)+(GST_VIDEO_I420_U_ROWSTRIDE(w)*ROUND_UP_2(h)/2))
#define GST_VIDEO_I420_SIZE(w,h) (GST_VIDEO_I420_V_OFFSET(w,h)+(GST_VIDEO_I420_V_ROWSTRIDE(w)*ROUND_UP_2(h)/2))
static void
gst_video_crop_i420 (GstVideoCrop * video_crop, GstBuffer * src_buffer,
GstBuffer * dest_buffer)
{
guint8 *src;
guint8 *dest;
guint8 *srcY, *srcU, *srcV;
guint8 *destY, *destU, *destV;
gint out_width = video_crop->width -
(video_crop->crop_left + video_crop->crop_right);
gint out_height = video_crop->height -
(video_crop->crop_top + video_crop->crop_bottom);
gint j;
src = GST_BUFFER_DATA (src_buffer);
dest = GST_BUFFER_DATA (dest_buffer);
srcY = src + GST_VIDEO_I420_Y_OFFSET (video_crop->width, video_crop->height);
destY = dest + GST_VIDEO_I420_Y_OFFSET (out_width, out_height);
/* copy Y plane first */
srcY +=
(GST_VIDEO_I420_Y_ROWSTRIDE (video_crop->width) * video_crop->crop_top) +
video_crop->crop_left;
for (j = 0; j < out_height; j++) {
memcpy (destY, srcY, out_width);
srcY += GST_VIDEO_I420_Y_ROWSTRIDE (video_crop->width);
destY += GST_VIDEO_I420_Y_ROWSTRIDE (out_width);
}
destU = dest + GST_VIDEO_I420_U_OFFSET (out_width, out_height);
destV = dest + GST_VIDEO_I420_V_OFFSET (out_width, out_height);
srcU = src + GST_VIDEO_I420_U_OFFSET (video_crop->width, video_crop->height);
srcV = src + GST_VIDEO_I420_V_OFFSET (video_crop->width, video_crop->height);
srcU +=
(GST_VIDEO_I420_U_ROWSTRIDE (video_crop->width) * (video_crop->crop_top /
2)) + (video_crop->crop_left / 2);
srcV +=
(GST_VIDEO_I420_V_ROWSTRIDE (video_crop->width) * (video_crop->crop_top /
2)) + (video_crop->crop_left / 2);
for (j = 0; j < out_height / 2; j++) {
/* copy U plane */
memcpy (destU, srcU, out_width / 2);
srcU += GST_VIDEO_I420_U_ROWSTRIDE (video_crop->width);
destU += GST_VIDEO_I420_U_ROWSTRIDE (out_width);
/* copy V plane */
memcpy (destV, srcV, out_width / 2);
srcV += GST_VIDEO_I420_V_ROWSTRIDE (video_crop->width);
destV += GST_VIDEO_I420_V_ROWSTRIDE (out_width);
}
}
static void
gst_video_crop_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buffer = GST_BUFFER (_data);
GstVideoCrop *video_crop;
GstBuffer *outbuf;
gint new_width, new_height;
video_crop = GST_VIDEO_CROP (gst_pad_get_parent (pad));
new_width = video_crop->width -
(video_crop->crop_left + video_crop->crop_right);
new_height = video_crop->height -
(video_crop->crop_top + video_crop->crop_bottom);
if (video_crop->renegotiate_src_caps || !GST_PAD_CAPS (video_crop->srcpad)) {
GstCaps *newcaps;
newcaps = gst_caps_copy (gst_pad_get_negotiated_caps (video_crop->sinkpad));
gst_caps_set_simple (newcaps,
"width", G_TYPE_INT, new_width, "height", G_TYPE_INT, new_height, NULL);
if (GST_PAD_LINK_FAILED (gst_pad_try_set_caps (video_crop->srcpad,
newcaps))) {
GST_ELEMENT_ERROR (video_crop, CORE, NEGOTIATION, (NULL), (NULL));
gst_caps_free (newcaps);
return;
}
gst_caps_free (newcaps);
video_crop->renegotiate_src_caps = FALSE;
}
/* passthrough if nothing to do */
if (new_width == video_crop->width && new_height == video_crop->height) {
gst_pad_push (video_crop->srcpad, GST_DATA (buffer));
return;
}
g_return_if_fail (GST_BUFFER_SIZE (buffer) >=
GST_VIDEO_I420_SIZE (video_crop->width, video_crop->height));
outbuf = gst_pad_alloc_buffer (video_crop->srcpad, GST_BUFFER_OFFSET (buffer),
GST_VIDEO_I420_SIZE (new_width, new_height));
gst_buffer_stamp (outbuf, buffer);
gst_video_crop_i420 (video_crop, buffer, outbuf);
gst_buffer_unref (buffer);
gst_pad_push (video_crop->srcpad, GST_DATA (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:
video_crop->renegotiate_src_caps = TRUE;
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;
}
if (parent_class->change_state != NULL)
return parent_class->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "videocrop", GST_RANK_NONE,
GST_TYPE_VIDEO_CROP);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videocrop",
"Crops video into a user defined region",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)