ref: a2a56b3ea59188e2e2b60b69a0a8f77aa3093144
dir: /libfaad/output.c/
/*
** FAAD - Freeware Advanced Audio Decoder
** Copyright (C) 2002 M. Bakker
**
** 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** $Id: output.c,v 1.13 2002/09/13 13:08:45 menno Exp $
**/
#include "common.h"
#include "output.h"
#include "decoder.h"
#ifndef FIXED_POINT
#include "dither.h"
#define ftol(A,B) {tmp = *(int32_t*) & A - 0x4B7F8000; \
B = (int16_t)((tmp==(int16_t)tmp) ? tmp : (tmp>>31)^0x7FFF);}
#define ROUND(x) ((x >= 0) ? (int32_t)floor((x) + 0.5) : (int32_t)ceil((x) + 0.5))
#define ROUND32(x) ROUND(x)
#define ROUND64(x) (doubletmp = (x) + Dither.Add + (int64_t)0x001FFFFD80000000L, *(int64_t*)(&doubletmp) - (int64_t)0x433FFFFD80000000L)
#define FLOAT_SCALE (1.0f/(1<<15))
dither_t Dither;
double doubletmp;
void* output_to_PCM(real_t **input, void *sample_buffer, uint8_t channels,
uint16_t frame_len, uint8_t format)
{
uint8_t ch;
uint16_t i, j = 0;
int16_t *short_sample_buffer = (int16_t*)sample_buffer;
int32_t *int_sample_buffer = (int32_t*)sample_buffer;
float32_t *float_sample_buffer = (float32_t*)sample_buffer;
/* Copy output to a standard PCM buffer */
switch (format)
{
case FAAD_FMT_16BIT:
for (ch = 0; ch < channels; ch++)
{
for(i = 0; i < frame_len; i++)
{
int32_t tmp;
real_t ftemp;
ftemp = input[ch][i] + 0xff8000;
ftol(ftemp, short_sample_buffer[(i*channels)+ch]);
}
}
break;
case FAAD_FMT_16BIT_DITHER:
for (ch = 0; ch < channels; ch++)
{
for(i = 0; i < frame_len; i++, j++)
{
double Sum = input[ch][i] * 65535.f;
int64_t val;
if(j > 31)
j = 0;
val = dither_output(1, 0, j, Sum, ch) / 65536;
if (val > (1<<15)-1)
val = (1<<15)-1;
else if (val < -(1<<15))
val = -(1<<15);
short_sample_buffer[(i*channels)+ch] = (int16_t)val;
}
}
break;
case FAAD_FMT_16BIT_L_SHAPE:
case FAAD_FMT_16BIT_M_SHAPE:
case FAAD_FMT_16BIT_H_SHAPE:
for (ch = 0; ch < channels; ch++)
{
for(i = 0; i < frame_len; i++, j++)
{
double Sum = input[ch][i] * 65535.f;
int64_t val;
if(j > 31)
j = 0;
val = dither_output(1, 1, j, Sum, ch) / 65536;
if (val > (1<<15)-1)
val = (1<<15)-1;
else if (val < -(1<<15))
val = -(1<<15);
short_sample_buffer[(i*channels)+ch] = (int16_t)val;
}
}
break;
case FAAD_FMT_24BIT:
for (ch = 0; ch < channels; ch++)
{
for(i = 0; i < frame_len; i++)
{
if (input[ch][i] > (1<<15)-1)
input[ch][i] = (1<<15)-1;
else if (input[ch][i] < -(1<<15))
input[ch][i] = -(1<<15);
int_sample_buffer[(i*channels)+ch] = ROUND(input[ch][i]*(1<<8));
}
}
break;
case FAAD_FMT_32BIT:
for (ch = 0; ch < channels; ch++)
{
for(i = 0; i < frame_len; i++)
{
if (input[ch][i] > (1<<15)-1)
input[ch][i] = (1<<15)-1;
else if (input[ch][i] < -(1<<15))
input[ch][i] = -(1<<15);
int_sample_buffer[(i*channels)+ch] = ROUND32(input[ch][i]*(1<<16));
}
}
break;
case FAAD_FMT_FLOAT:
for (ch = 0; ch < channels; ch++)
{
for(i = 0; i < frame_len; i++)
{
if (input[ch][i] > (1<<15)-1)
input[ch][i] = (1<<15)-1;
else if (input[ch][i] < -(1<<15))
input[ch][i] = -(1<<15);
float_sample_buffer[(i*channels)+ch] = input[ch][i]*FLOAT_SCALE;
}
}
break;
}
return sample_buffer;
}
/* Dither output */
static int64_t dither_output(uint8_t dithering, uint8_t shapingtype, uint16_t i, double Sum, uint8_t k)
{
double Sum2;
int64_t val;
if(dithering)
{
if(!shapingtype)
{
double tmp = Random_Equi(Dither.Dither);
Sum2 = tmp - Dither.LastRandomNumber[k];
Dither.LastRandomNumber[k] = tmp;
Sum2 = Sum += Sum2;
val = ROUND64(Sum2)&Dither.Mask;
} else {
Sum2 = Random_Triangular(Dither.Dither) - scalar16(Dither.DitherHistory[k], Dither.FilterCoeff + i);
Sum += Dither.DitherHistory[k][(-1-i)&15] = Sum2;
Sum2 = Sum + scalar16(Dither.ErrorHistory[k], Dither.FilterCoeff + i );
val = ROUND64(Sum2)&Dither.Mask;
Dither.ErrorHistory[k][(-1-i)&15] = (float)(Sum - val);
}
return val;
}
else
return ROUND64 (Sum);
}
#else
void* output_to_PCM(real_t **input, void *sample_buffer, uint8_t channels,
uint16_t frame_len, uint8_t format)
{
uint8_t ch;
uint16_t i;
int16_t *short_sample_buffer = (int16_t*)sample_buffer;
/* Copy output to a standard PCM buffer */
for (ch = 0; ch < channels; ch++)
{
for(i = 0; i < frame_len; i++)
{
int32_t tmp = input[ch][i];
tmp += (1 << (REAL_BITS-1));
tmp >>= REAL_BITS;
if (tmp > 0x7fff) tmp = 0x7fff;
else if (tmp <= -32768) tmp = -32768;
short_sample_buffer[(i*channels)+ch] = (int16_t)tmp;
}
}
return sample_buffer;
}
#endif