7d1b37cdac
This is done by expanding luma row to 32-byte alignment, since there is currently a bunch of code that assumes that uv_stride == y_stride/2 (see, for example, vp8/common/postproc.c, common/reconinter.c, common/arm/neon/recon16x16mb_neon.asm, encoder/temporal_filter.c, and possibly others; I haven't done a full audit). It also uses replaces the hardcoded border of 16 in a number of encoder buffers with VP8BORDERINPIXELS (currently 32), as the chroma rows start at an offset of border/2. Together, these two changes have the nice advantage that simply dumping the frame memory as a contiguous blob produces a valid, if padded, image. Change-Id: Iaf5ea722ae5c82d5daa50f6e2dade9de753f1003
101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vpx_scale/yv12config.h"
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#include "vpx_mem/vpx_mem.h"
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/****************************************************************************
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* Exports
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****************************************************************************/
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/****************************************************************************
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*
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****************************************************************************/
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int
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vp8_yv12_de_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf)
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{
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if (ybf)
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{
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vpx_free(ybf->buffer_alloc);
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/* buffer_alloc isn't accessed by most functions. Rather y_buffer,
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u_buffer and v_buffer point to buffer_alloc and are used. Clear out
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all of this so that a freed pointer isn't inadvertently used */
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vpx_memset (ybf, 0, sizeof (YV12_BUFFER_CONFIG));
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}
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else
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{
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return -1;
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}
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return 0;
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}
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/****************************************************************************
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*
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****************************************************************************/
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int
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vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height, int border)
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{
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/*NOTE:*/
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if (ybf)
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{
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int y_stride = ((width + 2 * border) + 31) & ~31;
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int yplane_size = (height + 2 * border) * y_stride;
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int uv_width = width >> 1;
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int uv_height = height >> 1;
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/** There is currently a bunch of code which assumes
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* uv_stride == y_stride/2, so enforce this here. */
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int uv_stride = y_stride >> 1;
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int uvplane_size = (uv_height + border) * uv_stride;
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vp8_yv12_de_alloc_frame_buffer(ybf);
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/** Only support allocating buffers that have a height and width that
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* are multiples of 16, and a border that's a multiple of 32.
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* The border restriction is required to get 16-byte alignment of the
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* start of the chroma rows without intoducing an arbitrary gap
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* between planes, which would break the semantics of things like
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* vpx_img_set_rect(). */
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if ((width & 0xf) | (height & 0xf) | (border & 0x1f))
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return -3;
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ybf->y_width = width;
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ybf->y_height = height;
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ybf->y_stride = y_stride;
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ybf->uv_width = uv_width;
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ybf->uv_height = uv_height;
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ybf->uv_stride = uv_stride;
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ybf->border = border;
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ybf->frame_size = yplane_size + 2 * uvplane_size;
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ybf->buffer_alloc = (unsigned char *) vpx_memalign(32, ybf->frame_size);
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if (ybf->buffer_alloc == NULL)
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return -1;
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ybf->y_buffer = ybf->buffer_alloc + (border * y_stride) + border;
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ybf->u_buffer = ybf->buffer_alloc + yplane_size + (border / 2 * uv_stride) + border / 2;
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ybf->v_buffer = ybf->buffer_alloc + yplane_size + uvplane_size + (border / 2 * uv_stride) + border / 2;
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ybf->corrupted = 0; /* assume not currupted by errors */
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}
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else
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{
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return -2;
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}
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return 0;
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}
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