ref: 973726c38bb0fd64fb14b1c95caabe52bd39d17d
dir: /vp9/vp9_iface_common.c/
/*
* Copyright (c) 2019 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 "vp9/vp9_iface_common.h"
void yuvconfig2image(vpx_image_t *img, const YV12_BUFFER_CONFIG *yv12,
void *user_priv) {
/** vpx_img_wrap() doesn't allow specifying independent strides for
* the Y, U, and V planes, nor other alignment adjustments that
* might be representable by a YV12_BUFFER_CONFIG, so we just
* initialize all the fields.*/
int bps;
if (!yv12->subsampling_y) {
if (!yv12->subsampling_x) {
img->fmt = VPX_IMG_FMT_I444;
bps = 24;
} else {
img->fmt = VPX_IMG_FMT_I422;
bps = 16;
}
} else {
if (!yv12->subsampling_x) {
img->fmt = VPX_IMG_FMT_I440;
bps = 16;
} else {
img->fmt = VPX_IMG_FMT_I420;
bps = 12;
}
}
img->cs = yv12->color_space;
img->range = yv12->color_range;
img->bit_depth = 8;
img->w = yv12->y_stride;
img->h = ALIGN_POWER_OF_TWO(yv12->y_height + 2 * VP9_ENC_BORDER_IN_PIXELS, 3);
img->d_w = yv12->y_crop_width;
img->d_h = yv12->y_crop_height;
img->r_w = yv12->render_width;
img->r_h = yv12->render_height;
img->x_chroma_shift = yv12->subsampling_x;
img->y_chroma_shift = yv12->subsampling_y;
img->planes[VPX_PLANE_Y] = yv12->y_buffer;
img->planes[VPX_PLANE_U] = yv12->u_buffer;
img->planes[VPX_PLANE_V] = yv12->v_buffer;
img->planes[VPX_PLANE_ALPHA] = NULL;
img->stride[VPX_PLANE_Y] = yv12->y_stride;
img->stride[VPX_PLANE_U] = yv12->uv_stride;
img->stride[VPX_PLANE_V] = yv12->uv_stride;
img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
#if CONFIG_VP9_HIGHBITDEPTH
if (yv12->flags & YV12_FLAG_HIGHBITDEPTH) {
// vpx_image_t uses byte strides and a pointer to the first byte
// of the image.
img->fmt = (vpx_img_fmt_t)(img->fmt | VPX_IMG_FMT_HIGHBITDEPTH);
img->bit_depth = yv12->bit_depth;
img->planes[VPX_PLANE_Y] = (uint8_t *)CONVERT_TO_SHORTPTR(yv12->y_buffer);
img->planes[VPX_PLANE_U] = (uint8_t *)CONVERT_TO_SHORTPTR(yv12->u_buffer);
img->planes[VPX_PLANE_V] = (uint8_t *)CONVERT_TO_SHORTPTR(yv12->v_buffer);
img->planes[VPX_PLANE_ALPHA] = NULL;
img->stride[VPX_PLANE_Y] = 2 * yv12->y_stride;
img->stride[VPX_PLANE_U] = 2 * yv12->uv_stride;
img->stride[VPX_PLANE_V] = 2 * yv12->uv_stride;
img->stride[VPX_PLANE_ALPHA] = 2 * yv12->y_stride;
}
#endif // CONFIG_VP9_HIGHBITDEPTH
img->bps = bps;
img->user_priv = user_priv;
img->img_data = yv12->buffer_alloc;
img->img_data_owner = 0;
img->self_allocd = 0;
}
vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,
YV12_BUFFER_CONFIG *yv12) {
yv12->y_buffer = img->planes[VPX_PLANE_Y];
yv12->u_buffer = img->planes[VPX_PLANE_U];
yv12->v_buffer = img->planes[VPX_PLANE_V];
yv12->y_crop_width = img->d_w;
yv12->y_crop_height = img->d_h;
yv12->render_width = img->r_w;
yv12->render_height = img->r_h;
yv12->y_width = img->d_w;
yv12->y_height = img->d_h;
yv12->uv_width = img->x_chroma_shift == 1 || img->fmt == VPX_IMG_FMT_NV12
? (1 + yv12->y_width) / 2
: yv12->y_width;
yv12->uv_height =
img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2 : yv12->y_height;
yv12->uv_crop_width = yv12->uv_width;
yv12->uv_crop_height = yv12->uv_height;
yv12->y_stride = img->stride[VPX_PLANE_Y];
yv12->uv_stride = img->stride[VPX_PLANE_U];
yv12->color_space = img->cs;
yv12->color_range = img->range;
#if CONFIG_VP9_HIGHBITDEPTH
if (img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) {
// In vpx_image_t
// planes point to uint8 address of start of data
// stride counts uint8s to reach next row
// In YV12_BUFFER_CONFIG
// y_buffer, u_buffer, v_buffer point to uint16 address of data
// stride and border counts in uint16s
// This means that all the address calculations in the main body of code
// should work correctly.
// However, before we do any pixel operations we need to cast the address
// to a uint16 ponter and double its value.
yv12->y_buffer = CONVERT_TO_BYTEPTR(yv12->y_buffer);
yv12->u_buffer = CONVERT_TO_BYTEPTR(yv12->u_buffer);
yv12->v_buffer = CONVERT_TO_BYTEPTR(yv12->v_buffer);
yv12->y_stride >>= 1;
yv12->uv_stride >>= 1;
yv12->flags = YV12_FLAG_HIGHBITDEPTH;
} else {
yv12->flags = 0;
}
yv12->border = (yv12->y_stride - img->w) / 2;
#else
yv12->border = (img->stride[VPX_PLANE_Y] - img->w) / 2;
#endif // CONFIG_VP9_HIGHBITDEPTH
yv12->subsampling_x = img->x_chroma_shift;
yv12->subsampling_y = img->y_chroma_shift;
// When reading the data, UV are in one plane for NV12 format, thus
// x_chroma_shift is 0. After converting, UV are in separate planes, and
// subsampling_x should be set to 1.
if (img->fmt == VPX_IMG_FMT_NV12) yv12->subsampling_x = 1;
return VPX_CODEC_OK;
}