ref: 05d55026f7fb3db0eab97e48b95fc9eab84337ef
dir: /vpx_scale/generic/yv12config.c/
/*
* 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 <assert.h>
#include "./vpx_config.h"
#include "vpx_scale/yv12config.h"
#include "vpx_mem/vpx_mem.h"
/****************************************************************************
* Exports
****************************************************************************/
/****************************************************************************
*
****************************************************************************/
#define yv12_align_addr(addr, align) \
(void*)(((size_t)(addr) + ((align) - 1)) & (size_t)-(align))
int
vp8_yv12_de_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf) {
if (ybf) {
// If libvpx is using frame buffer callbacks then buffer_alloc_sz must
// not be set.
if (ybf->buffer_alloc_sz > 0) {
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 = (uint8_t *)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 introducing 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->alpha_width = 0;
ybf->alpha_height = 0;
ybf->alpha_stride = 0;
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->alpha_buffer = NULL;
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;
}
#if CONFIG_VP9
// TODO(jkoleszar): Maybe replace this with struct vpx_image
int vp9_free_frame_buffer(YV12_BUFFER_CONFIG *ybf) {
if (ybf) {
if (ybf->buffer_alloc_sz > 0) {
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 vp9_realloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
int width, int height,
int ss_x, int ss_y, int border,
vpx_codec_frame_buffer_t *fb,
vpx_get_frame_buffer_cb_fn_t cb,
void *cb_priv) {
if (ybf) {
const int aligned_width = (width + 7) & ~7;
const int aligned_height = (height + 7) & ~7;
const int y_stride = ((aligned_width + 2 * border) + 31) & ~31;
const int yplane_size = (aligned_height + 2 * border) * y_stride;
const int uv_width = aligned_width >> ss_x;
const int uv_height = aligned_height >> ss_y;
const int uv_stride = y_stride >> ss_x;
const int uv_border_w = border >> ss_x;
const int uv_border_h = border >> ss_y;
const int uvplane_size = (uv_height + 2 * uv_border_h) * uv_stride;
#if CONFIG_ALPHA
const int alpha_width = aligned_width;
const int alpha_height = aligned_height;
const int alpha_stride = y_stride;
const int alpha_border_w = border;
const int alpha_border_h = border;
const int alpha_plane_size = (alpha_height + 2 * alpha_border_h) *
alpha_stride;
const int frame_size = yplane_size + 2 * uvplane_size +
alpha_plane_size;
#else
const int frame_size = yplane_size + 2 * uvplane_size;
#endif
if (cb != NULL) {
const int align_addr_extra_size = 31;
const size_t external_frame_size = frame_size + align_addr_extra_size;
assert(fb != NULL);
// Allocation to hold larger frame, or first allocation.
if (cb(cb_priv, external_frame_size, fb) < 0)
return -1;
if (fb->data == NULL || fb->size < external_frame_size)
return -1;
// This memset is needed for fixing valgrind error from C loop filter
// due to access uninitialized memory in frame border. It could be
// removed if border is totally removed.
vpx_memset(fb->data, 0, fb->size);
ybf->buffer_alloc = (uint8_t *)yv12_align_addr(fb->data, 32);
} else if (frame_size > ybf->buffer_alloc_sz) {
// Allocation to hold larger frame, or first allocation.
vpx_free(ybf->buffer_alloc);
ybf->buffer_alloc = (uint8_t *)vpx_memalign(32, frame_size);
if (!ybf->buffer_alloc)
return -1;
ybf->buffer_alloc_sz = frame_size;
// This memset is needed for fixing valgrind error from C loop filter
// due to access uninitialized memory in frame border. It could be
// removed if border is totally removed.
vpx_memset(ybf->buffer_alloc, 0, ybf->buffer_alloc_sz);
}
/* 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 introducing 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_crop_width = (width + ss_x) >> ss_x;
ybf->uv_crop_height = (height + ss_y) >> ss_y;
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 +
(uv_border_h * uv_stride) + uv_border_w;
ybf->v_buffer = ybf->buffer_alloc + yplane_size + uvplane_size +
(uv_border_h * uv_stride) + uv_border_w;
#if CONFIG_ALPHA
ybf->alpha_width = alpha_width;
ybf->alpha_height = alpha_height;
ybf->alpha_stride = alpha_stride;
ybf->alpha_buffer = ybf->buffer_alloc + yplane_size + 2 * uvplane_size +
(alpha_border_h * alpha_stride) + alpha_border_w;
#endif
ybf->corrupted = 0; /* assume not corrupted by errors */
return 0;
}
return -2;
}
int vp9_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
int width, int height,
int ss_x, int ss_y, int border) {
if (ybf) {
vp9_free_frame_buffer(ybf);
return vp9_realloc_frame_buffer(ybf, width, height, ss_x, ss_y, border,
NULL, NULL, NULL);
}
return -2;
}
#endif