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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_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;
}
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