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video-info: respect stride alignment

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Increase the left padding so that we don't cause stride alignments later when we
apply the padding.

https://bugzilla.gnome.org/show_bug.cgi?id=694299
This commit is contained in:
Wim Taymans 2013-07-19 10:47:27 +02:00
parent fad4589579
commit 5732ced692
1 changed files with 27 additions and 4 deletions
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31
gst-libs/gst/video/video-info.c
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@ -730,15 +730,38 @@ gst_video_info_align (GstVideoInfo * info, GstVideoAlignment * align)
GST_LOG ("padding %u-%ux%u-%u", align->padding_top,
align->padding_left, align->padding_right, align->padding_bottom);
/* add the padding */
padded_width = width + align->padding_left + align->padding_right;
padded_height = height + align->padding_top + align->padding_bottom;
n_planes = GST_VIDEO_INFO_N_PLANES (info);
if (GST_VIDEO_FORMAT_INFO_HAS_PALETTE (vinfo))
n_planes--;
/* first make sure the left padding does not cause alignment problems later */
do {
GST_LOG ("left padding %u", align->padding_left);
aligned = TRUE;
for (i = 0; i < n_planes; i++) {
gint hedge;
/* this is the amout of pixels to add as left padding */
hedge = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (vinfo, i, align->padding_left);
hedge *= GST_VIDEO_FORMAT_INFO_PSTRIDE (vinfo, i);
GST_LOG ("plane %d, padding %d, alignment %u", i, hedge,
align->stride_align[i]);
aligned &= (hedge & align->stride_align[i]) == 0;
}
if (aligned)
break;
GST_LOG ("unaligned padding, increasing padding");
/* increase padded_width */
align->padding_left += align->padding_left & ~(align->padding_left - 1);
} while (!aligned);
/* add the padding */
padded_width = width + align->padding_left + align->padding_right;
padded_height = height + align->padding_top + align->padding_bottom;
do {
GST_LOG ("padded dimension %u-%u", padded_width, padded_height);