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-rw-r--r--gst/videocrop/gstvideocrop.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/gst/videocrop/gstvideocrop.c b/gst/videocrop/gstvideocrop.c
index 9dfefc01..78375545 100644
--- a/gst/videocrop/gstvideocrop.c
+++ b/gst/videocrop/gstvideocrop.c
@@ -244,8 +244,10 @@ gst_video_crop_get_image_details_from_caps (GstVideoCrop * vcrop,
details->stride = GST_ROUND_UP_4 (width * 2);
details->size = details->stride * height;
if (format == GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y')) {
+ /* UYVY = 4:2:2 - [U0 Y0 V0 Y1] [U2 Y2 V2 Y3] [U4 Y4 V4 Y5] */
details->macro_y_off = 1;
} else {
+ /* YUYV = 4:2:2 - [Y0 U0 Y1 V0] [Y2 U2 Y3 V2] [Y4 U4 Y5 V4] = YUY2 */
details->macro_y_off = 0;
}
break;
@@ -311,6 +313,8 @@ gst_video_crop_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
return TRUE;
}
+#define ROUND_DOWN_2(n) ((n)&(~1))
+
static void
gst_video_crop_transform_packed_complex (GstVideoCrop * vcrop,
GstBuffer * inbuf, GstBuffer * outbuf)
@@ -322,27 +326,25 @@ gst_video_crop_transform_packed_complex (GstVideoCrop * vcrop,
out_data = GST_BUFFER_DATA (outbuf);
in_data += vcrop->crop_top * vcrop->in.stride;
- in_data += vcrop->crop_left * vcrop->in.bytes_per_pixel;
+
+ /* rounding down here so we end up at the start of a macro-pixel and not
+ * in the middle of one */
+ in_data += ROUND_DOWN_2 (vcrop->crop_left) * vcrop->in.bytes_per_pixel;
dx = vcrop->out.width * vcrop->out.bytes_per_pixel;
+ /* UYVY = 4:2:2 - [U0 Y0 V0 Y1] [U2 Y2 V2 Y3] [U4 Y4 V4 Y5]
+ * YUYV = 4:2:2 - [Y0 U0 Y1 V0] [Y2 U2 Y3 V2] [Y4 U4 Y5 V4] = YUY2 */
if ((vcrop->crop_left % 2) != 0) {
for (i = 0; i < vcrop->out.height; ++i) {
gint j;
memcpy (out_data, in_data, dx);
- /* U/V is horizontally subsampled by a factor of 2, so must fix that up */
- /* FIXME: this is obviously not quite right */
- if (vcrop->in.macro_y_off == 0) {
- for (j = 1; j < vcrop->out.stride; j += 2) {
- out_data[j] = in_data[j - 1];
- }
- } else {
- for (j = 0; j < vcrop->out.stride /* -2 */ ; j += 2) {
- out_data[j] = in_data[j + 2];
- }
- }
+ /* move just the Y samples one pixel to the left, don't worry about
+ * chroma shift */
+ for (j = vcrop->in.macro_y_off; j < vcrop->out.stride - 2; j += 2)
+ out_data[j] = in_data[j + 2];
in_data += vcrop->in.stride;
out_data += vcrop->out.stride;