From 6dd1ca288fb14d8ebfe3be2c050f6bb2dd4330c8 Mon Sep 17 00:00:00 2001 From: David Schleef Date: Fri, 25 Jul 2003 08:41:44 +0000 Subject: Rewrote the core function. Added some nice #defines that should probably go in gstvideo.h. Fixes #118245. Original commit message from CVS: Rewrote the core function. Added some nice #defines that should probably go in gstvideo.h. Fixes #118245. --- gst/videocrop/gstvideocrop.c | 61 ++++++++++++++++++++++++++++---------------- 1 file changed, 39 insertions(+), 22 deletions(-) (limited to 'gst/videocrop/gstvideocrop.c') diff --git a/gst/videocrop/gstvideocrop.c b/gst/videocrop/gstvideocrop.c index d2f2c67d..d96061a0 100644 --- a/gst/videocrop/gstvideocrop.c +++ b/gst/videocrop/gstvideocrop.c @@ -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; } } -- cgit v1.2.1