diff options
Diffstat (limited to 'vpx_scale/generic/yv12config.c')
| -rw-r--r-- | vpx_scale/generic/yv12config.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/vpx_scale/generic/yv12config.c b/vpx_scale/generic/yv12config.c index d02cde28f..eff594e2d 100644 --- a/vpx_scale/generic/yv12config.c +++ b/vpx_scale/generic/yv12config.c @@ -49,25 +49,33 @@ vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height, int if (ybf) { + int y_stride = ((width + 2 * border) + 31) & ~31; + int yplane_size = (height + 2 * border) * y_stride; int uv_width = width >> 1; int uv_height = height >> 1; - int yplane_size = (height + 2 * border) * (width + 2 * border); - int uvplane_size = (uv_height + border) * (uv_width + border); + /** There is currently a bunch of code which assumes + * uv_stride == y_stride/2, so enforce this here. */ + int uv_stride = y_stride >> 1; + int uvplane_size = (uv_height + border) * uv_stride; vp8_yv12_de_alloc_frame_buffer(ybf); - /* only support allocating buffers that have - a height and width that are multiples of 16 */ - if ((width & 0xf) | (height & 0xf)) + /** Only support allocating buffers that have a height and width that + * are multiples of 16, and a border that's a multiple of 32. + * The border restriction is required to get 16-byte alignment of the + * start of the chroma rows without intoducing an arbitrary gap + * between planes, which would break the semantics of things like + * vpx_img_set_rect(). */ + if ((width & 0xf) | (height & 0xf) | (border & 0x1f)) return -3; ybf->y_width = width; ybf->y_height = height; - ybf->y_stride = width + 2 * border; + ybf->y_stride = y_stride; ybf->uv_width = uv_width; ybf->uv_height = uv_height; - ybf->uv_stride = uv_width + border; + ybf->uv_stride = uv_stride; ybf->border = border; ybf->frame_size = yplane_size + 2 * uvplane_size; @@ -77,9 +85,9 @@ vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height, int if (ybf->buffer_alloc == NULL) return -1; - ybf->y_buffer = ybf->buffer_alloc + (border * ybf->y_stride) + border; - ybf->u_buffer = ybf->buffer_alloc + yplane_size + (border / 2 * ybf->uv_stride) + border / 2; - ybf->v_buffer = ybf->buffer_alloc + yplane_size + uvplane_size + (border / 2 * ybf->uv_stride) + border / 2; + ybf->y_buffer = ybf->buffer_alloc + (border * y_stride) + border; + ybf->u_buffer = ybf->buffer_alloc + yplane_size + (border / 2 * uv_stride) + border / 2; + ybf->v_buffer = ybf->buffer_alloc + yplane_size + uvplane_size + (border / 2 * uv_stride) + border / 2; ybf->corrupted = 0; /* assume not currupted by errors */ } |