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/*
* copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
* Copyright (C) 2016 foo86
*
* 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 "fft.h"
#include "dcadct.h"
#include "dcamath.h"
#include "synth_filter.h"
static void synth_filter_float(FFTContext *imdct,
float *synth_buf_ptr, int *synth_buf_offset,
float synth_buf2[32], const float window[512],
float out[32], const float in[32], float scale)
{
float *synth_buf = synth_buf_ptr + *synth_buf_offset;
int i, j;
imdct->imdct_half(imdct, synth_buf, in);
for (i = 0; i < 16; i++) {
float a = synth_buf2[i ];
float b = synth_buf2[i + 16];
float c = 0;
float d = 0;
for (j = 0; j < 512 - *synth_buf_offset; j += 64) {
a += window[i + j ] * (-synth_buf[15 - i + j ]);
b += window[i + j + 16] * ( synth_buf[ i + j ]);
c += window[i + j + 32] * ( synth_buf[16 + i + j ]);
d += window[i + j + 48] * ( synth_buf[31 - i + j ]);
}
for ( ; j < 512; j += 64) {
a += window[i + j ] * (-synth_buf[15 - i + j - 512]);
b += window[i + j + 16] * ( synth_buf[ i + j - 512]);
c += window[i + j + 32] * ( synth_buf[16 + i + j - 512]);
d += window[i + j + 48] * ( synth_buf[31 - i + j - 512]);
}
out[i ] = a * scale;
out[i + 16] = b * scale;
synth_buf2[i ] = c;
synth_buf2[i + 16] = d;
}
*synth_buf_offset = (*synth_buf_offset - 32) & 511;
}
static void synth_filter_float_64(FFTContext *imdct,
float *synth_buf_ptr, int *synth_buf_offset,
float synth_buf2[64], const float window[1024],
float out[64], const float in[64], float scale)
{
float *synth_buf = synth_buf_ptr + *synth_buf_offset;
int i, j;
imdct->imdct_half(imdct, synth_buf, in);
for (i = 0; i < 32; i++) {
float a = synth_buf2[i ];
float b = synth_buf2[i + 32];
float c = 0;
float d = 0;
for (j = 0; j < 1024 - *synth_buf_offset; j += 128) {
a += window[i + j ] * (-synth_buf[31 - i + j ]);
b += window[i + j + 32] * ( synth_buf[ i + j ]);
c += window[i + j + 64] * ( synth_buf[32 + i + j ]);
d += window[i + j + 96] * ( synth_buf[63 - i + j ]);
}
for ( ; j < 1024; j += 128) {
a += window[i + j ] * (-synth_buf[31 - i + j - 1024]);
b += window[i + j + 32] * ( synth_buf[ i + j - 1024]);
c += window[i + j + 64] * ( synth_buf[32 + i + j - 1024]);
d += window[i + j + 96] * ( synth_buf[63 - i + j - 1024]);
}
out[i ] = a * scale;
out[i + 32] = b * scale;
synth_buf2[i ] = c;
synth_buf2[i + 32] = d;
}
*synth_buf_offset = (*synth_buf_offset - 64) & 1023;
}
static void synth_filter_fixed(DCADCTContext *imdct,
int32_t *synth_buf_ptr, int *synth_buf_offset,
int32_t synth_buf2[32], const int32_t window[512],
int32_t out[32], const int32_t in[32])
{
int32_t *synth_buf = synth_buf_ptr + *synth_buf_offset;
int i, j;
imdct->imdct_half[0](synth_buf, in);
for (i = 0; i < 16; i++) {
int64_t a = synth_buf2[i ] * (INT64_C(1) << 21);
int64_t b = synth_buf2[i + 16] * (INT64_C(1) << 21);
int64_t c = 0;
int64_t d = 0;
for (j = 0; j < 512 - *synth_buf_offset; j += 64) {
a += (int64_t)window[i + j ] * synth_buf[ i + j ];
b += (int64_t)window[i + j + 16] * synth_buf[15 - i + j ];
c += (int64_t)window[i + j + 32] * synth_buf[16 + i + j ];
d += (int64_t)window[i + j + 48] * synth_buf[31 - i + j ];
}
for ( ; j < 512; j += 64) {
a += (int64_t)window[i + j ] * synth_buf[ i + j - 512];
b += (int64_t)window[i + j + 16] * synth_buf[15 - i + j - 512];
c += (int64_t)window[i + j + 32] * synth_buf[16 + i + j - 512];
d += (int64_t)window[i + j + 48] * synth_buf[31 - i + j - 512];
}
out[i ] = clip23(norm21(a));
out[i + 16] = clip23(norm21(b));
synth_buf2[i ] = norm21(c);
synth_buf2[i + 16] = norm21(d);
}
*synth_buf_offset = (*synth_buf_offset - 32) & 511;
}
static void synth_filter_fixed_64(DCADCTContext *imdct,
int32_t *synth_buf_ptr, int *synth_buf_offset,
int32_t synth_buf2[64], const int32_t window[1024],
int32_t out[64], const int32_t in[64])
{
int32_t *synth_buf = synth_buf_ptr + *synth_buf_offset;
int i, j;
imdct->imdct_half[1](synth_buf, in);
for (i = 0; i < 32; i++) {
int64_t a = synth_buf2[i ] * (INT64_C(1) << 20);
int64_t b = synth_buf2[i + 32] * (INT64_C(1) << 20);
int64_t c = 0;
int64_t d = 0;
for (j = 0; j < 1024 - *synth_buf_offset; j += 128) {
a += (int64_t)window[i + j ] * synth_buf[ i + j ];
b += (int64_t)window[i + j + 32] * synth_buf[31 - i + j ];
c += (int64_t)window[i + j + 64] * synth_buf[32 + i + j ];
d += (int64_t)window[i + j + 96] * synth_buf[63 - i + j ];
}
for ( ; j < 1024; j += 128) {
a += (int64_t)window[i + j ] * synth_buf[ i + j - 1024];
b += (int64_t)window[i + j + 32] * synth_buf[31 - i + j - 1024];
c += (int64_t)window[i + j + 64] * synth_buf[32 + i + j - 1024];
d += (int64_t)window[i + j + 96] * synth_buf[63 - i + j - 1024];
}
out[i ] = clip23(norm20(a));
out[i + 32] = clip23(norm20(b));
synth_buf2[i ] = norm20(c);
synth_buf2[i + 32] = norm20(d);
}
*synth_buf_offset = (*synth_buf_offset - 64) & 1023;
}
av_cold void ff_synth_filter_init(SynthFilterContext *c)
{
c->synth_filter_float = synth_filter_float;
c->synth_filter_float_64 = synth_filter_float_64;
c->synth_filter_fixed = synth_filter_fixed;
c->synth_filter_fixed_64 = synth_filter_fixed_64;
if (ARCH_AARCH64)
ff_synth_filter_init_aarch64(c);
if (ARCH_ARM)
ff_synth_filter_init_arm(c);
if (ARCH_X86)
ff_synth_filter_init_x86(c);
}
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