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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "apv.h"
#include "apv_dsp.h"
static const int8_t apv_trans_matrix[8][8] = {
{ 64, 64, 64, 64, 64, 64, 64, 64 },
{ 89, 75, 50, 18, -18, -50, -75, -89 },
{ 84, 35, -35, -84, -84, -35, 35, 84 },
{ 75, -18, -89, -50, 50, 89, 18, -75 },
{ 64, -64, -64, 64, 64, -64, -64, 64 },
{ 50, -89, 18, 75, -75, -18, 89, -50 },
{ 35, -84, 84, -35, -35, 84, -84, 35 },
{ 18, -50, 75, -89, 89, -75, 50, -18 },
};
static void apv_decode_transquant_c(void *output,
ptrdiff_t pitch,
const int16_t *input_flat,
const int16_t *qmatrix_flat,
int bit_depth,
int qp_shift)
{
const int16_t (*input)[8] = (const int16_t(*)[8])input_flat;
const int16_t (*qmatrix)[8] = (const int16_t(*)[8])qmatrix_flat;
int16_t scaled_coeff[8][8];
int32_t recon_sample[8][8];
// Dequant.
{
// Note that level_scale was already combined into qmatrix
// before we got here.
int bd_shift = bit_depth + 3 - 5;
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 8; x++) {
int coeff = (input[y][x] * qmatrix[y][x] * (1 << qp_shift) +
(1 << (bd_shift - 1))) >> bd_shift;
scaled_coeff[y][x] =
av_clip(coeff, APV_MIN_TRANS_COEFF,
APV_MAX_TRANS_COEFF);
}
}
}
// Transform.
{
int32_t tmp[8][8];
// Vertical transform of columns.
for (int x = 0; x < 8; x++) {
for (int i = 0; i < 8; i++) {
int sum = 0;
for (int j = 0; j < 8; j++)
sum += apv_trans_matrix[j][i] * scaled_coeff[j][x];
tmp[i][x] = sum;
}
}
// Renormalise.
for (int x = 0; x < 8; x++) {
for (int y = 0; y < 8; y++)
tmp[y][x] = (tmp[y][x] + 64) >> 7;
}
// Horizontal transform of rows.
for (int y = 0; y < 8; y++) {
for (int i = 0; i < 8; i++) {
int sum = 0;
for (int j = 0; j < 8; j++)
sum += apv_trans_matrix[j][i] * tmp[y][j];
recon_sample[y][i] = sum;
}
}
}
// Output.
if (bit_depth == 8) {
uint8_t *ptr = output;
int bd_shift = 20 - bit_depth;
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 8; x++) {
int sample = ((recon_sample[y][x] +
(1 << (bd_shift - 1))) >> bd_shift) +
(1 << (bit_depth - 1));
ptr[x] = av_clip_uintp2(sample, bit_depth);
}
ptr += pitch;
}
} else {
uint16_t *ptr = output;
int bd_shift = 20 - bit_depth;
pitch /= 2; // Pitch was in bytes, 2 bytes per sample.
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 8; x++) {
int sample = ((recon_sample[y][x] +
(1 << (bd_shift - 1))) >> bd_shift) +
(1 << (bit_depth - 1));
ptr[x] = av_clip_uintp2(sample, bit_depth);
}
ptr += pitch;
}
}
}
av_cold void ff_apv_dsp_init(APVDSPContext *dsp)
{
dsp->decode_transquant = apv_decode_transquant_c;
#if ARCH_X86_64
ff_apv_dsp_init_x86_64(dsp);
#endif
}
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