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codecparsers: h264: fix calculation of the frame cropping rectangle.

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Fix calculation of the frame cropping rectangle, and more precisely
the actual cropped height. The frame_crop_top_offset subtraction
was not scaled up with SubHeightC.

Also clean-up variables to align more with (7-18) to (7-21).

Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This commit is contained in:
Gwenole Beauchesne 2013-07-08 18:44:24 +02:00 committed by Sebastian Dröge
parent 529ece338f
commit ac9c1ae5a8
1 changed files with 9 additions and 8 deletions
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17
gst-libs/gst/codecparsers/gsth264parser.c
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@ -1565,18 +1565,19 @@ gst_h264_parse_sps (GstH264NalUnit * nalu, GstH264SPS * sps,
sps->height = height;
if (sps->frame_cropping_flag) {
const guint crop_unit_x = subwc[sps->chroma_format_idc];
const guint crop_unit_y =
subhc[sps->chroma_format_idc] * (2 - sps->frame_mbs_only_flag);
width -= (sps->frame_crop_left_offset + sps->frame_crop_right_offset)
* subwc[sps->chroma_format_idc];
height -= (sps->frame_crop_top_offset + sps->frame_crop_bottom_offset
* subhc[sps->chroma_format_idc] * (2 - sps->frame_mbs_only_flag));
* crop_unit_x;
height -= (sps->frame_crop_top_offset + sps->frame_crop_bottom_offset)
* crop_unit_y;
sps->crop_rect_width = width;
sps->crop_rect_height = height;
sps->crop_rect_x =
sps->frame_crop_left_offset * subwc[sps->chroma_format_idc];
sps->crop_rect_y =
sps->frame_crop_top_offset * subhc[sps->chroma_format_idc] * (2 -
sps->frame_mbs_only_flag);
sps->crop_rect_x = sps->frame_crop_left_offset * crop_unit_x;
sps->crop_rect_y = sps->frame_crop_top_offset * crop_unit_y;
GST_LOG ("crop_rectangle x=%u y=%u width=%u, height=%u", sps->crop_rect_x,
sps->crop_rect_y, width, height);