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/*
* Copyright (c) 2011 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 "vp8_mem.h"
#include "yv12utils.h"
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 */
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)
{
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. */
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;
}
void vp8_yv12_extend_frame_borders(YV12_BUFFER_CONFIG *ybf)
{
int i;
unsigned char *src_ptr1, *src_ptr2;
unsigned char *dest_ptr1, *dest_ptr2;
unsigned int Border;
int plane_stride;
int plane_height;
int plane_width;
/***********/
/* Y Plane */
/***********/
Border = ybf->border;
plane_stride = ybf->y_stride;
plane_height = ybf->y_height;
plane_width = ybf->y_width;
/* Copy the left and right most columns out */
src_ptr1 = ybf->y_buffer;
src_ptr2 = src_ptr1 + plane_width - 1;
dest_ptr1 = src_ptr1 - Border;
dest_ptr2 = src_ptr2 + 1;
for (i = 0; i < plane_height; i++)
{
memset(dest_ptr1, src_ptr1[0], Border);
memset(dest_ptr2, src_ptr2[0], Border);
src_ptr1 += plane_stride;
src_ptr2 += plane_stride;
dest_ptr1 += plane_stride;
dest_ptr2 += plane_stride;
}
/* Now copy the top and bottom source lines into each line of the respective borders */
src_ptr1 = ybf->y_buffer - Border;
src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
dest_ptr1 = src_ptr1 - (Border * plane_stride);
dest_ptr2 = src_ptr2 + plane_stride;
for (i = 0; i < (int)Border; i++)
{
memcpy(dest_ptr1, src_ptr1, plane_stride);
memcpy(dest_ptr2, src_ptr2, plane_stride);
dest_ptr1 += plane_stride;
dest_ptr2 += plane_stride;
}
/***********/
/* U Plane */
/***********/
plane_stride = ybf->uv_stride;
plane_height = ybf->uv_height;
plane_width = ybf->uv_width;
Border /= 2;
/* Copy the left and right most columns out */
src_ptr1 = ybf->u_buffer;
src_ptr2 = src_ptr1 + plane_width - 1;
dest_ptr1 = src_ptr1 - Border;
dest_ptr2 = src_ptr2 + 1;
for (i = 0; i < plane_height; i++)
{
memset(dest_ptr1, src_ptr1[0], Border);
memset(dest_ptr2, src_ptr2[0], Border);
src_ptr1 += plane_stride;
src_ptr2 += plane_stride;
dest_ptr1 += plane_stride;
dest_ptr2 += plane_stride;
}
/* Now copy the top and bottom source lines into each line of the respective borders */
src_ptr1 = ybf->u_buffer - Border;
src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
dest_ptr1 = src_ptr1 - (Border * plane_stride);
dest_ptr2 = src_ptr2 + plane_stride;
for (i = 0; i < (int)(Border); i++)
{
memcpy(dest_ptr1, src_ptr1, plane_stride);
memcpy(dest_ptr2, src_ptr2, plane_stride);
dest_ptr1 += plane_stride;
dest_ptr2 += plane_stride;
}
/***********/
/* V Plane */
/***********/
/* Copy the left and right most columns out */
src_ptr1 = ybf->v_buffer;
src_ptr2 = src_ptr1 + plane_width - 1;
dest_ptr1 = src_ptr1 - Border;
dest_ptr2 = src_ptr2 + 1;
for (i = 0; i < plane_height; i++)
{
memset(dest_ptr1, src_ptr1[0], Border);
memset(dest_ptr2, src_ptr2[0], Border);
src_ptr1 += plane_stride;
src_ptr2 += plane_stride;
dest_ptr1 += plane_stride;
dest_ptr2 += plane_stride;
}
/* Now copy the top and bottom source lines into each line of the respective borders */
src_ptr1 = ybf->v_buffer - Border;
src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
dest_ptr1 = src_ptr1 - (Border * plane_stride);
dest_ptr2 = src_ptr2 + plane_stride;
for (i = 0; i < (int)(Border); i++)
{
memcpy(dest_ptr1, src_ptr1, plane_stride);
memcpy(dest_ptr2, src_ptr2, plane_stride);
dest_ptr1 += plane_stride;
dest_ptr2 += plane_stride;
}
}
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