ref: 6dbf738a43cf2380b9b5cc6fb867b52919ca2a20
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 <limits.h>
#include "vpx_scale/yv12config.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/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 */
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 size_t frame_size = yplane_size + 2 * uvplane_size;
if (!ybf->buffer_alloc) {
ybf->buffer_alloc = (uint8_t *)vpx_memalign(32, frame_size);
#if defined(__has_feature)
#if __has_feature(memory_sanitizer)
// This memset is needed for fixing the issue of using uninitialized
// value in msan test. It will cause a perf loss, so only do this for
// msan test.
memset(ybf->buffer_alloc, 0, frame_size);
#endif
#endif
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_crop_width = (width + 1) / 2;
ybf->uv_crop_height = (height + 1) / 2;
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 vpx_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 */
memset(ybf, 0, sizeof(YV12_BUFFER_CONFIG));
} else {
return -1;
}
return 0;
}
int vpx_realloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height,
int ss_x, int ss_y,
#if CONFIG_VP9_HIGHBITDEPTH
int use_highbitdepth,
#endif
int border, int byte_alignment,
vpx_codec_frame_buffer_t *fb,
vpx_get_frame_buffer_cb_fn_t cb, void *cb_priv) {
#if CONFIG_SIZE_LIMIT
if (width > DECODE_WIDTH_LIMIT || height > DECODE_HEIGHT_LIMIT) return -1;
#endif
/* 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;
if (ybf) {
const int vp9_byte_align = (byte_alignment == 0) ? 1 : byte_alignment;
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 uint64_t yplane_size =
(aligned_height + 2 * border) * (uint64_t)y_stride + byte_alignment;
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 uint64_t uvplane_size =
(uv_height + 2 * uv_border_h) * (uint64_t)uv_stride + byte_alignment;
#if CONFIG_VP9_HIGHBITDEPTH
const uint64_t frame_size =
(1 + use_highbitdepth) * (yplane_size + 2 * uvplane_size);
#else
const uint64_t frame_size = yplane_size + 2 * uvplane_size;
#endif // CONFIG_VP9_HIGHBITDEPTH
uint8_t *buf = NULL;
// frame_size is stored in buffer_alloc_sz, which is a size_t. If it won't
// fit, fail early.
if (frame_size > SIZE_MAX) {
return -1;
}
if (cb != NULL) {
const int align_addr_extra_size = 31;
const uint64_t external_frame_size = frame_size + align_addr_extra_size;
assert(fb != NULL);
if (external_frame_size != (size_t)external_frame_size) return -1;
// Allocation to hold larger frame, or first allocation.
if (cb(cb_priv, (size_t)external_frame_size, fb) < 0) return -1;
if (fb->data == NULL || fb->size < external_frame_size) return -1;
ybf->buffer_alloc = (uint8_t *)yv12_align_addr(fb->data, 32);
#if defined(__has_feature)
#if __has_feature(memory_sanitizer)
// This memset is needed for fixing the issue of using uninitialized
// value in msan test. It will cause a perf loss, so only do this for
// msan test.
memset(ybf->buffer_alloc, 0, (size_t)frame_size);
#endif
#endif
} else if (frame_size > ybf->buffer_alloc_sz) {
// Allocation to hold larger frame, or first allocation.
vpx_free(ybf->buffer_alloc);
ybf->buffer_alloc = NULL;
ybf->buffer_alloc = (uint8_t *)vpx_memalign(32, (size_t)frame_size);
if (!ybf->buffer_alloc) return -1;
ybf->buffer_alloc_sz = (size_t)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.
memset(ybf->buffer_alloc, 0, ybf->buffer_alloc_sz);
}
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 = (size_t)frame_size;
ybf->subsampling_x = ss_x;
ybf->subsampling_y = ss_y;
buf = ybf->buffer_alloc;
#if CONFIG_VP9_HIGHBITDEPTH
if (use_highbitdepth) {
// Store uint16 addresses when using 16bit framebuffers
buf = CONVERT_TO_BYTEPTR(ybf->buffer_alloc);
ybf->flags = YV12_FLAG_HIGHBITDEPTH;
} else {
ybf->flags = 0;
}
#endif // CONFIG_VP9_HIGHBITDEPTH
ybf->y_buffer = (uint8_t *)yv12_align_addr(
buf + (border * y_stride) + border, vp9_byte_align);
ybf->u_buffer = (uint8_t *)yv12_align_addr(
buf + yplane_size + (uv_border_h * uv_stride) + uv_border_w,
vp9_byte_align);
ybf->v_buffer =
(uint8_t *)yv12_align_addr(buf + yplane_size + uvplane_size +
(uv_border_h * uv_stride) + uv_border_w,
vp9_byte_align);
ybf->corrupted = 0; /* assume not corrupted by errors */
return 0;
}
return -2;
}
int vpx_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height,
int ss_x, int ss_y,
#if CONFIG_VP9_HIGHBITDEPTH
int use_highbitdepth,
#endif
int border, int byte_alignment) {
if (ybf) {
vpx_free_frame_buffer(ybf);
return vpx_realloc_frame_buffer(ybf, width, height, ss_x, ss_y,
#if CONFIG_VP9_HIGHBITDEPTH
use_highbitdepth,
#endif
border, byte_alignment, NULL, NULL, NULL);
}
return -2;
}
#endif