82 lines
2.1 KiB
C
Executable file
82 lines
2.1 KiB
C
Executable file
/*
|
|
* TAK decoder
|
|
* Copyright (c) 2015 Paul B Mahol
|
|
*
|
|
* 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 "libavutil/attributes.h"
|
|
#include "takdsp.h"
|
|
#include "config.h"
|
|
|
|
static void decorrelate_ls(int32_t *p1, int32_t *p2, int length)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
int32_t a = p1[i];
|
|
int32_t b = p2[i];
|
|
p2[i] = a + b;
|
|
}
|
|
}
|
|
|
|
static void decorrelate_sr(int32_t *p1, int32_t *p2, int length)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
int32_t a = p1[i];
|
|
int32_t b = p2[i];
|
|
p1[i] = b - a;
|
|
}
|
|
}
|
|
|
|
static void decorrelate_sm(int32_t *p1, int32_t *p2, int length)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
int32_t a = p1[i];
|
|
int32_t b = p2[i];
|
|
a -= b >> 1;
|
|
p1[i] = a;
|
|
p2[i] = a + b;
|
|
}
|
|
}
|
|
|
|
static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
int32_t a = p1[i];
|
|
int32_t b = p2[i];
|
|
b = dfactor * (b >> dshift) + 128 >> 8 << dshift;
|
|
p1[i] = b - a;
|
|
}
|
|
}
|
|
|
|
av_cold void ff_takdsp_init(TAKDSPContext *c)
|
|
{
|
|
c->decorrelate_ls = decorrelate_ls;
|
|
c->decorrelate_sr = decorrelate_sr;
|
|
c->decorrelate_sm = decorrelate_sm;
|
|
c->decorrelate_sf = decorrelate_sf;
|
|
|
|
if (ARCH_X86)
|
|
ff_takdsp_init_x86(c);
|
|
}
|