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/*****************************************************************************
* Copyright (C) 2017
*
* Authors: Humberto Ribeiro Filho <mont3z.claro5@gmail.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_NS;
/* standard dct transformations */
static dct_t* s_dct4x4;
static dct_t* s_dct8x8;
static dct_t* s_dct16x16;
static void lowPassDct8_c(const int16_t* src, int16_t* dst, intptr_t srcStride)
{
ALIGN_VAR_32(int16_t, coef[4 * 4]);
ALIGN_VAR_32(int16_t, avgBlock[4 * 4]);
int16_t totalSum = 0;
int16_t sum = 0;
for (int i = 0; i < 4; i++)
for (int j =0; j < 4; j++)
{
// Calculate average of 2x2 cells
sum = src[2*i*srcStride + 2*j] + src[2*i*srcStride + 2*j + 1]
+ src[(2*i+1)*srcStride + 2*j] + src[(2*i+1)*srcStride + 2*j + 1];
avgBlock[i*4 + j] = sum >> 2;
totalSum += sum; // use to calculate total block average
}
//dct4
(*s_dct4x4)(avgBlock, coef, 4);
memset(dst, 0, 64 * sizeof(int16_t));
for (int i = 0; i < 4; i++)
{
memcpy(&dst[i * 8], &coef[i * 4], 4 * sizeof(int16_t));
}
// replace first coef with total block average
#if X265_DEPTH == 8
dst[0] = totalSum << 1;
#else
dst[0] = totalSum >> (X265_DEPTH - 9);
#endif
}
static void lowPassDct16_c(const int16_t* src, int16_t* dst, intptr_t srcStride)
{
ALIGN_VAR_32(int16_t, coef[8 * 8]);
ALIGN_VAR_32(int16_t, avgBlock[8 * 8]);
int32_t totalSum = 0;
int16_t sum = 0;
for (int i = 0; i < 8; i++)
for (int j =0; j < 8; j++)
{
sum = src[2*i*srcStride + 2*j] + src[2*i*srcStride + 2*j + 1]
+ src[(2*i+1)*srcStride + 2*j] + src[(2*i+1)*srcStride + 2*j + 1];
avgBlock[i*8 + j] = sum >> 2;
totalSum += sum;
}
(*s_dct8x8)(avgBlock, coef, 8);
memset(dst, 0, 256 * sizeof(int16_t));
for (int i = 0; i < 8; i++)
{
memcpy(&dst[i * 16], &coef[i * 8], 8 * sizeof(int16_t));
}
dst[0] = static_cast<int16_t>(totalSum >> (1 + (X265_DEPTH - 8)));
}
static void lowPassDct32_c(const int16_t* src, int16_t* dst, intptr_t srcStride)
{
ALIGN_VAR_32(int16_t, coef[16 * 16]);
ALIGN_VAR_32(int16_t, avgBlock[16 * 16]);
int32_t totalSum = 0;
int16_t sum = 0;
for (int i = 0; i < 16; i++)
for (int j =0; j < 16; j++)
{
sum = src[2*i*srcStride + 2*j] + src[2*i*srcStride + 2*j + 1]
+ src[(2*i+1)*srcStride + 2*j] + src[(2*i+1)*srcStride + 2*j + 1];
avgBlock[i*16 + j] = sum >> 2;
totalSum += sum;
}
(*s_dct16x16)(avgBlock, coef, 16);
memset(dst, 0, 1024 * sizeof(int16_t));
for (int i = 0; i < 16; i++)
{
memcpy(&dst[i * 32], &coef[i * 16], 16 * sizeof(int16_t));
}
dst[0] = static_cast<int16_t>(totalSum >> (3 + (X265_DEPTH - 8)));
}
namespace X265_NS {
// x265 private namespace
void setupLowPassPrimitives_c(EncoderPrimitives& p)
{
s_dct4x4 = &(p.cu[BLOCK_4x4].standard_dct);
s_dct8x8 = &(p.cu[BLOCK_8x8].standard_dct);
s_dct16x16 = &(p.cu[BLOCK_16x16].standard_dct);
p.cu[BLOCK_8x8].lowpass_dct = lowPassDct8_c;
p.cu[BLOCK_16x16].lowpass_dct = lowPassDct16_c;
p.cu[BLOCK_32x32].lowpass_dct = lowPassDct32_c;
}
}
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