131 строка
4.8 KiB
C
131 строка
4.8 KiB
C
/*
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* Copyright (c) 2013 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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#ifndef VP9_VP9_IFACE_COMMON_H_
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#define VP9_VP9_IFACE_COMMON_H_
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#include "vpx_ports/mem.h"
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static void yuvconfig2image(vpx_image_t *img, const YV12_BUFFER_CONFIG *yv12,
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void *user_priv) {
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/** vpx_img_wrap() doesn't allow specifying independent strides for
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* the Y, U, and V planes, nor other alignment adjustments that
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* might be representable by a YV12_BUFFER_CONFIG, so we just
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* initialize all the fields.*/
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int bps;
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if (!yv12->subsampling_y) {
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if (!yv12->subsampling_x) {
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img->fmt = VPX_IMG_FMT_I444;
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bps = 24;
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} else {
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img->fmt = VPX_IMG_FMT_I422;
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bps = 16;
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}
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} else {
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if (!yv12->subsampling_x) {
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img->fmt = VPX_IMG_FMT_I440;
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bps = 16;
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} else {
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img->fmt = VPX_IMG_FMT_I420;
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bps = 12;
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}
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}
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img->cs = yv12->color_space;
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img->bit_depth = 8;
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img->w = yv12->y_stride;
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img->h = ALIGN_POWER_OF_TWO(yv12->y_height + 2 * VP9_ENC_BORDER_IN_PIXELS, 3);
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img->d_w = yv12->y_crop_width;
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img->d_h = yv12->y_crop_height;
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img->x_chroma_shift = yv12->subsampling_x;
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img->y_chroma_shift = yv12->subsampling_y;
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img->planes[VPX_PLANE_Y] = yv12->y_buffer;
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img->planes[VPX_PLANE_U] = yv12->u_buffer;
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img->planes[VPX_PLANE_V] = yv12->v_buffer;
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img->planes[VPX_PLANE_ALPHA] = NULL;
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img->stride[VPX_PLANE_Y] = yv12->y_stride;
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img->stride[VPX_PLANE_U] = yv12->uv_stride;
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img->stride[VPX_PLANE_V] = yv12->uv_stride;
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img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
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#if CONFIG_VP9_HIGHBITDEPTH
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if (yv12->flags & YV12_FLAG_HIGHBITDEPTH) {
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// vpx_image_t uses byte strides and a pointer to the first byte
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// of the image.
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img->fmt |= VPX_IMG_FMT_HIGHBITDEPTH;
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img->bit_depth = yv12->bit_depth;
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img->planes[VPX_PLANE_Y] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->y_buffer);
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img->planes[VPX_PLANE_U] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->u_buffer);
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img->planes[VPX_PLANE_V] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->v_buffer);
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img->planes[VPX_PLANE_ALPHA] = NULL;
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img->stride[VPX_PLANE_Y] = 2 * yv12->y_stride;
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img->stride[VPX_PLANE_U] = 2 * yv12->uv_stride;
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img->stride[VPX_PLANE_V] = 2 * yv12->uv_stride;
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img->stride[VPX_PLANE_ALPHA] = 2 * yv12->y_stride;
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}
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#endif // CONFIG_VP9_HIGHBITDEPTH
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img->bps = bps;
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img->user_priv = user_priv;
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img->img_data = yv12->buffer_alloc;
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img->img_data_owner = 0;
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img->self_allocd = 0;
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}
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static vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,
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YV12_BUFFER_CONFIG *yv12) {
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yv12->y_buffer = img->planes[VPX_PLANE_Y];
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yv12->u_buffer = img->planes[VPX_PLANE_U];
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yv12->v_buffer = img->planes[VPX_PLANE_V];
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yv12->y_crop_width = img->d_w;
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yv12->y_crop_height = img->d_h;
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yv12->y_width = img->d_w;
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yv12->y_height = img->d_h;
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yv12->uv_width = img->x_chroma_shift == 1 ? (1 + yv12->y_width) / 2
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: yv12->y_width;
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yv12->uv_height = img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2
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: yv12->y_height;
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yv12->uv_crop_width = yv12->uv_width;
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yv12->uv_crop_height = yv12->uv_height;
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yv12->y_stride = img->stride[VPX_PLANE_Y];
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yv12->uv_stride = img->stride[VPX_PLANE_U];
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yv12->color_space = img->cs;
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#if CONFIG_VP9_HIGHBITDEPTH
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if (img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) {
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// In vpx_image_t
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// planes point to uint8 address of start of data
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// stride counts uint8s to reach next row
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// In YV12_BUFFER_CONFIG
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// y_buffer, u_buffer, v_buffer point to uint16 address of data
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// stride and border counts in uint16s
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// This means that all the address calculations in the main body of code
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// should work correctly.
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// However, before we do any pixel operations we need to cast the address
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// to a uint16 ponter and double its value.
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yv12->y_buffer = CONVERT_TO_BYTEPTR(yv12->y_buffer);
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yv12->u_buffer = CONVERT_TO_BYTEPTR(yv12->u_buffer);
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yv12->v_buffer = CONVERT_TO_BYTEPTR(yv12->v_buffer);
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yv12->y_stride >>= 1;
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yv12->uv_stride >>= 1;
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yv12->flags = YV12_FLAG_HIGHBITDEPTH;
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} else {
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yv12->flags = 0;
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}
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yv12->border = (yv12->y_stride - img->w) / 2;
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#else
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yv12->border = (img->stride[VPX_PLANE_Y] - img->w) / 2;
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#endif // CONFIG_VP9_HIGHBITDEPTH
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yv12->subsampling_x = img->x_chroma_shift;
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yv12->subsampling_y = img->y_chroma_shift;
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return VPX_CODEC_OK;
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}
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#endif // VP9_VP9_IFACE_COMMON_H_
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