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Rewrote the core function. Added some nice #defines that should probably go in gstvideo.h. Fixes #118245.

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Original commit message from CVS:
Rewrote the core function.  Added some nice #defines that should
probably go in gstvideo.h.  Fixes #118245.
This commit is contained in:
David Schleef 2003-07-25 08:41:44 +00:00
parent a962c0f40c
commit 6dd1ca288f
1 changed files with 39 additions and 22 deletions
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61
gst/videocrop/gstvideocrop.c
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@ -277,53 +277,70 @@ gst_video_crop_sink_connect (GstPad *pad, GstCaps *caps)
return GST_PAD_LINK_OK;
}
#define GST_VIDEO_I420_SIZE(width,height) ((width)*(height) + ((width)/2)*((height)/2)*2)
#define GST_VIDEO_I420_Y_OFFSET(width,height) (0)
#define GST_VIDEO_I420_U_OFFSET(width,height) ((width)*(height))
#define GST_VIDEO_I420_V_OFFSET(width,height) ((width)*(height) + ((width/2)*(height/2)))
#define GST_VIDEO_I420_Y_ROWSTRIDE(width) (width)
#define GST_VIDEO_I420_U_ROWSTRIDE(width) ((width)/2)
#define GST_VIDEO_I420_V_ROWSTRIDE(width) ((width)/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 src_stride = video_crop->width;
gint src_size = video_crop->width * video_crop->height;
gint src_stride;
gint j;
srcY = GST_BUFFER_DATA (src_buffer) +
(src_stride * video_crop->crop_top + video_crop->crop_left);
destY = GST_BUFFER_DATA (dest_buffer);
src = GST_BUFFER_DATA (src_buffer);
dest = GST_BUFFER_DATA (dest_buffer);
g_return_if_fail(GST_BUFFER_SIZE (dest_buffer) == GST_VIDEO_I420_SIZE(out_width,out_height));
srcY = src + GST_VIDEO_I420_Y_OFFSET(video_crop->width, video_crop->height);
destY = dest + GST_VIDEO_I420_Y_OFFSET(out_width, out_height);
src_stride = GST_VIDEO_I420_Y_ROWSTRIDE(video_crop->width);
/* copy Y plane first */
srcY += src_stride * video_crop->crop_top + video_crop->crop_left;
for (j = 0; j < out_height; j++) {
memcpy (destY, srcY, out_width);
srcY += src_stride;
destY += out_width;
}
out_width >>= 1;
src_stride >>= 1;
out_height >>= 1;
src_stride = GST_VIDEO_I420_U_ROWSTRIDE(video_crop->width);
destU = destY;
destV = destU + ((out_width * out_height) >> 1);
destU = dest + GST_VIDEO_I420_U_OFFSET(out_width, out_height);
destV = dest + GST_VIDEO_I420_V_OFFSET(out_width, out_height);
srcU = GST_BUFFER_DATA (src_buffer) + src_size +
((src_stride * video_crop->crop_top + video_crop->crop_left) >> 1);
srcV = srcU + (src_size >> 2);
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);
/* copy U plane */
for (j = 0; j < out_height; j++) {
memcpy (destU, srcU, out_width);
srcU += src_stride * (video_crop->crop_top/2) + (video_crop->crop_left/2);
srcV += src_stride * (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 += src_stride;
destU += out_width;
}
/* copy U plane */
for (j = 0; j < out_height; j++) {
memcpy (destV, srcV, out_width);
destU += out_width/2;
/* copy V plane */
memcpy (destV, srcV, out_width/2);
srcV += src_stride;
destV += out_width;
destV += out_width/2;
}
}