x265-1.7版本-common/intrapred.cpp注释

注：问号以及未注释部分会在x265-1.8版本内更新

/****************************************************************************** Copyright (C) 2013 x265 project** Authors: Min Chen <chenm003@163.com>** This program is free software; you can redistribute it and/or modify* it under the terms of the GNU General Public License as published by* the Free Software Foundation; either version 2 of the License, or* (at your option) any later version.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the* GNU General Public License for more details.** You should have received a copy of the GNU General Public License* along with this program; if not, write to the Free Software* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.** This program is also available under a commercial proprietary license.* For more information, contact us at license @ x265.com.*****************************************************************************/#include "common.h"
#include "primitives.h"using namespace x265;namespace {/** 函数功能       ： 对帧内参考像素进行滤波
/*  调用范围       ： 只在Predict::initAdiPattern、Predict::initAdiPatternChroma和LookaheadTLD::lowresIntraEstimate函数中被调用
* \参数tuSize      ： 当前的块大小
* \参数samples     ： 参考像素
* \参数filtered    ： 返回滤波后的参考像素
* \返回值          ： null**/
template<int tuSize>
void intraFilter(const pixel* samples, pixel* filtered) /* 1:2:1 filtering of left and top reference samples */
{const int tuSize2 = tuSize << 1; //用于直接获取topLast数据，因为存储方式是先存储左上角像素， top，top-right，left， left-bottom格式pixel topLeft = samples[0], topLast = samples[tuSize2], leftLast = samples[tuSize2 + tuSize2]; //获取相应位置数据// filtering topfor (int i = 1; i < tuSize2; i++)filtered[i] = ((samples[i] << 1) + samples[i - 1] + samples[i + 1] + 2) >> 2;  //对所有top行数据进行滤波，除第一个数据与最后一个数据filtered[tuSize2] = topLast;                                                       //top行最后一个数据不进行滤波，直接进行copy// filtering top-leftfiltered[0] = ((topLeft << 1) + samples[1] + samples[tuSize2 + 1] + 2) >> 2;      //对左上角像素进行滤波： 采用top第一个数据与left第一个数据// filtering leftfiltered[tuSize2 + 1] = ((samples[tuSize2 + 1] << 1) + topLeft + samples[tuSize2 + 2] + 2) >> 2; for (int i = tuSize2 + 2; i < tuSize2 + tuSize2; i++)filtered[i] = ((samples[i] << 1) + samples[i - 1] + samples[i + 1] + 2) >> 2;   //对left列进行滤波filtered[tuSize2 + tuSize2] = leftLast;                                             //left列最后一个数据不进行滤波，直接进行copy
}void dcPredFilter(const pixel* above, const pixel* left, pixel* dst, intptr_t dststride, int size)
{// boundary pixels processingdst[0] = (pixel)((above[0] + left[0] + 2 * dst[0] + 2) >> 2);for (int x = 1; x < size; x++)dst[x] = (pixel)((above[x] +  3 * dst[x] + 2) >> 2);dst += dststride;for (int y = 1; y < size; y++){*dst = (pixel)((left[y] + 3 * *dst + 2) >> 2);dst += dststride;}
}template<int width>
void intra_pred_dc_c(pixel* dst, intptr_t dstStride, const pixel* srcPix, int /*dirMode*/, int bFilter)
{int k, l;int dcVal = width;for (int i = 0; i < width; i++)dcVal += srcPix[1 + i] + srcPix[2 * width + 1 + i];dcVal = dcVal / (width + width);for (k = 0; k < width; k++)for (l = 0; l < width; l++)dst[k * dstStride + l] = (pixel)dcVal;if (bFilter)dcPredFilter(srcPix + 1, srcPix + (2 * width + 1), dst, dstStride, width);
}template<int log2Size>
void planar_pred_c(pixel* dst, intptr_t dstStride, const pixel* srcPix, int /*dirMode*/, int /*bFilter*/)
{const int blkSize = 1 << log2Size;const pixel* above = srcPix + 1;const pixel* left  = srcPix + (2 * blkSize + 1);pixel topRight = above[blkSize];pixel bottomLeft = left[blkSize];for (int y = 0; y < blkSize; y++)for (int x = 0; x < blkSize; x++)dst[y * dstStride + x] = (pixel) (((blkSize - 1 - x) * left[y] + (blkSize - 1 -y) * above[x] + (x + 1) * topRight + (y + 1) * bottomLeft + blkSize) >> (log2Size + 1));
}/** 函数功能     ：按照预测方向的标号计算当前块大小的预测值
* \参数 width    ：待计算的块的宽度
* \参数 dst      ：预测块地址
* \参数 dstStride：步长
* \参数 srcPix0  ：周边像素地址
* \参数 dirMode  ：模式
* \参数  bFilter ：是否进行滤波
* \返回值        ：null
*/
template<int width>
void intra_pred_ang_c(pixel* dst, intptr_t dstStride, const pixel *srcPix0, int dirMode, int bFilter)
{int width2 = width << 1;// Flip the neighbours in the horizontal case.int horMode = dirMode < 18;pixel neighbourBuf[129];const pixel *srcPix = srcPix0;if (horMode){neighbourBuf[0] = srcPix[0];for (int i = 0; i < width << 1; i++){neighbourBuf[1 + i] = srcPix[width2 + 1 + i];neighbourBuf[width2 + 1 + i] = srcPix[1 + i];}srcPix = neighbourBuf;}// Intra prediction angle and inverse angle tables.const int8_t angleTable[17] = { -32, -26, -21, -17, -13, -9, -5, -2, 0, 2, 5, 9, 13, 17, 21, 26, 32 };const int16_t invAngleTable[8] = { 4096, 1638, 910, 630, 482, 390, 315, 256 };// Get the prediction angle.int angleOffset = horMode ? 10 - dirMode : dirMode - 26;int angle = angleTable[8 + angleOffset];// Vertical Prediction.if (!angle){for (int y = 0; y < width; y++)for (int x = 0; x < width; x++)dst[y * dstStride + x] = srcPix[1 + x];if (bFilter){int topLeft = srcPix[0], top = srcPix[1];for (int y = 0; y < width; y++)dst[y * dstStride] = x265_clip((int16_t)(top + ((srcPix[width2 + 1 + y] - topLeft) >> 1)));}}else // Angular prediction.{// Get the reference pixels. The reference base is the first pixel to the top (neighbourBuf[1]).pixel refBuf[64];const pixel *ref;// Use the projected left neighbours and the top neighbours.if (angle < 0){// Number of neighbours projected. int nbProjected = -((width * angle) >> 5) - 1;pixel *ref_pix = refBuf + nbProjected + 1;// Project the neighbours.int invAngle = invAngleTable[- angleOffset - 1];int invAngleSum = 128;for (int i = 0; i < nbProjected; i++){invAngleSum += invAngle;ref_pix[- 2 - i] = srcPix[width2 + (invAngleSum >> 8)];}// Copy the top-left and top pixels.for (int i = 0; i < width + 1; i++)ref_pix[-1 + i] = srcPix[i];ref = ref_pix;}else // Use the top and top-right neighbours.ref = srcPix + 1;// Pass every row.int angleSum = 0;for (int y = 0; y < width; y++){angleSum += angle;int offset = angleSum >> 5;int fraction = angleSum & 31;if (fraction) // Interpolatefor (int x = 0; x < width; x++)dst[y * dstStride + x] = (pixel)(((32 - fraction) * ref[offset + x] + fraction * ref[offset + x + 1] + 16) >> 5);else // Copy.for (int x = 0; x < width; x++)dst[y * dstStride + x] = ref[offset + x];}}// Flip for horizontal.if (horMode){for (int y = 0; y < width - 1; y++){for (int x = y + 1; x < width; x++){pixel tmp              = dst[y * dstStride + x];dst[y * dstStride + x] = dst[x * dstStride + y];dst[x * dstStride + y] = tmp;}}}
}template<int log2Size>
void all_angs_pred_c(pixel *dest, pixel *refPix, pixel *filtPix, int bLuma)
{const int size = 1 << log2Size;for (int mode = 2; mode <= 34; mode++){pixel *srcPix  = (g_intraFilterFlags[mode] & size ? filtPix  : refPix);pixel *out = dest + ((mode - 2) << (log2Size * 2));intra_pred_ang_c<size>(out, size, srcPix, mode, bLuma);// Optimize code don't flip bufferbool modeHor = (mode < 18);// transpose the block if this is a horizontal modeif (modeHor){for (int k = 0; k < size - 1; k++){for (int l = k + 1; l < size; l++){pixel tmp         = out[k * size + l];out[k * size + l] = out[l * size + k];out[l * size + k] = tmp;}}}}
}
}namespace x265 {
// x265 private namespacevoid setupIntraPrimitives_c(EncoderPrimitives& p)
{p.cu[BLOCK_4x4].intra_filter = intraFilter<4>;p.cu[BLOCK_8x8].intra_filter = intraFilter<8>;p.cu[BLOCK_16x16].intra_filter = intraFilter<16>;p.cu[BLOCK_32x32].intra_filter = intraFilter<32>;p.cu[BLOCK_4x4].intra_pred[PLANAR_IDX] = planar_pred_c<2>;p.cu[BLOCK_8x8].intra_pred[PLANAR_IDX] = planar_pred_c<3>;p.cu[BLOCK_16x16].intra_pred[PLANAR_IDX] = planar_pred_c<4>;p.cu[BLOCK_32x32].intra_pred[PLANAR_IDX] = planar_pred_c<5>;p.cu[BLOCK_4x4].intra_pred[DC_IDX] = intra_pred_dc_c<4>;p.cu[BLOCK_8x8].intra_pred[DC_IDX] = intra_pred_dc_c<8>;p.cu[BLOCK_16x16].intra_pred[DC_IDX] = intra_pred_dc_c<16>;p.cu[BLOCK_32x32].intra_pred[DC_IDX] = intra_pred_dc_c<32>;for (int i = 2; i < NUM_INTRA_MODE; i++){p.cu[BLOCK_4x4].intra_pred[i] = intra_pred_ang_c<4>;p.cu[BLOCK_8x8].intra_pred[i] = intra_pred_ang_c<8>;p.cu[BLOCK_16x16].intra_pred[i] = intra_pred_ang_c<16>;p.cu[BLOCK_32x32].intra_pred[i] = intra_pred_ang_c<32>;}p.cu[BLOCK_4x4].intra_pred_allangs = all_angs_pred_c<2>;p.cu[BLOCK_8x8].intra_pred_allangs = all_angs_pred_c<3>;p.cu[BLOCK_16x16].intra_pred_allangs = all_angs_pred_c<4>;p.cu[BLOCK_32x32].intra_pred_allangs = all_angs_pred_c<5>;
}
}

x265-1.7版本-common/intrapred.cpp注释相关推荐

x265-1.8版本-common/wavefront.cpp注释
注:问号以及未注释部分会在x265-1.9版本内更新 /*********************************************************************** ...
x265-1.8版本-common/pixel.cpp注释
注:问号以及未注释部分会在x265-1.9版本内更新 /*********************************************************************** ...
x265-1.7版本-common/pixel.cpp注释
注:问号以及未注释部分会在x265-1.8版本内更新 /********************************************************************** ...
x265-1.7版本-common/lowres.cpp注释
注:问号以及未注释部分会在x265-1.8版本内更新 /********************************************************************** ...
x265-1.8版本-common/lowres.cpp注释
注:问号以及未注释部分会在x265-1.9版本内更新 /*********************************************************************** ...
x265-1.8版本-common/wavefront.h注释
注:问号以及未注释部分会在x265-1.9版本内更新 /*********************************************************************** ...
x265-1.8版本-encoder/dpb.cpp注释
注:问号以及未注释部分会在x265-1.9版本内更新 /*********************************************************************** ...
x265-1.7版本-encoder/dpb.cpp注释
注:问号以及未注释部分会在x265-1.8版本内更新 /*********************************************************************** ...
x265-1.8版本-common/contexts.h注释
注:问号以及未注释部分会在x265-1.9版本内更新 /*********************************************************************** ...

x265-1.7版本-common/intrapred.cpp注释

x265-1.7版本-common/intrapred.cpp注释相关推荐

最新文章

热门文章