| /* |
| * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| |
| #include "vpx_scale/yv12config.h" |
| #include "vpx_mem/vpx_mem.h" |
| |
| /**************************************************************************** |
| * Exports |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * |
| ****************************************************************************/ |
| int |
| vp8_yv12_de_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf) |
| { |
| if (ybf) |
| { |
| vpx_free(ybf->buffer_alloc); |
| |
| /* buffer_alloc isn't accessed by most functions. Rather y_buffer, |
| u_buffer and v_buffer point to buffer_alloc and are used. Clear out |
| all of this so that a freed pointer isn't inadvertently used */ |
| vpx_memset (ybf, 0, sizeof (YV12_BUFFER_CONFIG)); |
| } |
| else |
| { |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /**************************************************************************** |
| * |
| ****************************************************************************/ |
| int |
| vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height, int border) |
| { |
| /*NOTE:*/ |
| |
| 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; |
| /** 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, 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 = y_stride; |
| |
| ybf->uv_width = uv_width; |
| ybf->uv_height = uv_height; |
| ybf->uv_stride = uv_stride; |
| |
| ybf->border = border; |
| ybf->frame_size = yplane_size + 2 * uvplane_size; |
| |
| ybf->buffer_alloc = (unsigned char *) vpx_memalign(32, ybf->frame_size); |
| |
| if (ybf->buffer_alloc == NULL) |
| return -1; |
| |
| 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 */ |
| } |
| else |
| { |
| return -2; |
| } |
| |
| return 0; |
| } |