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/*
* 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_realloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
int width, int height, int border) {
if (ybf) {
int aligned_width = (width + 15) & ~15;
int aligned_height = (height + 15) & ~15;
int y_stride = ((aligned_width + 2 * border) + 31) & ~31;
int yplane_size = (aligned_height + 2 * border) * y_stride;
int uv_width = aligned_width >> 1;
int uv_height = aligned_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;
const int frame_size = yplane_size + 2 * uvplane_size;
if (!ybf->buffer_alloc) {
ybf->buffer_alloc = vpx_memalign(32, frame_size);
ybf->buffer_alloc_sz = frame_size;
}
if (!ybf->buffer_alloc || ybf->buffer_alloc_sz < frame_size)
return -1;
/* Only support allocating buffers that have 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 (border & 0x1f)
return -3;
ybf->y_crop_width = width;
ybf->y_crop_height = height;
ybf->y_width = aligned_width;
ybf->y_height = aligned_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 = frame_size;
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 */
return 0;
}
return -2;
}
int vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
int width, int height, int border) {
if (ybf) {
vp8_yv12_de_alloc_frame_buffer(ybf);
return vp8_yv12_realloc_frame_buffer(ybf, width, height, border);
}
return -2;
}
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