ref: a432dd721ceda6bf59e4a51d338cb8920d245219
dir: /frontend/audio.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** The "appropriate copyright message" mentioned in section 2c of the GPLv2
** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
**
** $Id: audio.c,v 1.29 2008/09/19 22:50:17 menno Exp $
**/
#ifdef _WIN32
#include <io.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <math.h>
#include <neaacdec.h>
#include "audio.h"
audio_file *open_audio_file(char *infile, int samplerate, int channels,
int outputFormat, int fileType, long channelMask)
{
audio_file *aufile = malloc(sizeof(audio_file));
aufile->outputFormat = outputFormat;
aufile->samplerate = samplerate;
aufile->channels = channels;
aufile->total_samples = 0;
aufile->fileType = fileType;
aufile->channelMask = channelMask;
switch (outputFormat)
{
case FAAD_FMT_16BIT:
aufile->bits_per_sample = 16;
break;
case FAAD_FMT_24BIT:
aufile->bits_per_sample = 24;
break;
case FAAD_FMT_32BIT:
case FAAD_FMT_FLOAT:
aufile->bits_per_sample = 32;
break;
default:
if (aufile) free(aufile);
return NULL;
}
if(infile[0] == '-')
{
#ifdef _WIN32
setmode(fileno(stdout), O_BINARY);
#endif
aufile->sndfile = stdout;
aufile->toStdio = 1;
} else {
aufile->toStdio = 0;
aufile->sndfile = fopen(infile, "wb");
}
if (aufile->sndfile == NULL)
{
if (aufile) free(aufile);
return NULL;
}
if (aufile->fileType == OUTPUT_WAV)
{
if (aufile->channelMask)
write_wav_extensible_header(aufile, aufile->channelMask);
else
write_wav_header(aufile);
}
return aufile;
}
int write_audio_file(audio_file *aufile, void *sample_buffer, int samples, int offset)
{
char *buf = (char *)sample_buffer;
switch (aufile->outputFormat)
{
case FAAD_FMT_16BIT:
return write_audio_16bit(aufile, buf + offset*2, samples);
case FAAD_FMT_24BIT:
return write_audio_24bit(aufile, buf + offset*4, samples);
case FAAD_FMT_32BIT:
return write_audio_32bit(aufile, buf + offset*4, samples);
case FAAD_FMT_FLOAT:
return write_audio_float(aufile, buf + offset*4, samples);
default:
return 0;
}
return 0;
}
void close_audio_file(audio_file *aufile)
{
if ((aufile->fileType == OUTPUT_WAV) && (aufile->toStdio == 0))
{
fseek(aufile->sndfile, 0, SEEK_SET);
if (aufile->channelMask)
write_wav_extensible_header(aufile, aufile->channelMask);
else
write_wav_header(aufile);
}
if (aufile->toStdio == 0)
fclose(aufile->sndfile);
if (aufile) free(aufile);
}
static int write_wav_header(audio_file *aufile)
{
unsigned char header[44];
unsigned char* p = header;
unsigned int bytes = (aufile->bits_per_sample + 7) / 8;
float data_size = (float)bytes * aufile->total_samples;
unsigned long word32;
*p++ = 'R'; *p++ = 'I'; *p++ = 'F'; *p++ = 'F';
word32 = (data_size + (44 - 8) < (float)MAXWAVESIZE) ?
(unsigned long)data_size + (44 - 8) : (unsigned long)MAXWAVESIZE;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
*p++ = 'W'; *p++ = 'A'; *p++ = 'V'; *p++ = 'E';
*p++ = 'f'; *p++ = 'm'; *p++ = 't'; *p++ = ' ';
*p++ = 0x10; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;
if (aufile->outputFormat == FAAD_FMT_FLOAT)
{
*p++ = 0x03; *p++ = 0x00;
} else {
*p++ = 0x01; *p++ = 0x00;
}
*p++ = (unsigned char)(aufile->channels >> 0);
*p++ = (unsigned char)(aufile->channels >> 8);
word32 = (unsigned long)(aufile->samplerate + 0.5);
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
word32 = aufile->samplerate * bytes * aufile->channels;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
word32 = bytes * aufile->channels;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(aufile->bits_per_sample >> 0);
*p++ = (unsigned char)(aufile->bits_per_sample >> 8);
*p++ = 'd'; *p++ = 'a'; *p++ = 't'; *p++ = 'a';
word32 = data_size < MAXWAVESIZE ?
(unsigned long)data_size : (unsigned long)MAXWAVESIZE;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
return fwrite(header, sizeof(header), 1, aufile->sndfile);
}
static int write_wav_extensible_header(audio_file *aufile, long channelMask)
{
unsigned char header[68];
unsigned char* p = header;
unsigned int bytes = (aufile->bits_per_sample + 7) / 8;
float data_size = (float)bytes * aufile->total_samples;
unsigned long word32;
*p++ = 'R'; *p++ = 'I'; *p++ = 'F'; *p++ = 'F';
word32 = (data_size + (68 - 8) < (float)MAXWAVESIZE) ?
(unsigned long)data_size + (68 - 8) : (unsigned long)MAXWAVESIZE;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
*p++ = 'W'; *p++ = 'A'; *p++ = 'V'; *p++ = 'E';
*p++ = 'f'; *p++ = 'm'; *p++ = 't'; *p++ = ' ';
*p++ = /*0x10*/0x28; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;
/* WAVE_FORMAT_EXTENSIBLE */
*p++ = 0xFE; *p++ = 0xFF;
*p++ = (unsigned char)(aufile->channels >> 0);
*p++ = (unsigned char)(aufile->channels >> 8);
word32 = (unsigned long)(aufile->samplerate + 0.5);
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
word32 = aufile->samplerate * bytes * aufile->channels;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
word32 = bytes * aufile->channels;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(aufile->bits_per_sample >> 0);
*p++ = (unsigned char)(aufile->bits_per_sample >> 8);
/* cbSize */
*p++ = (unsigned char)(22);
*p++ = (unsigned char)(0);
/* WAVEFORMATEXTENSIBLE */
/* wValidBitsPerSample */
*p++ = (unsigned char)(aufile->bits_per_sample >> 0);
*p++ = (unsigned char)(aufile->bits_per_sample >> 8);
/* dwChannelMask */
word32 = channelMask;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
/* SubFormat */
if (aufile->outputFormat == FAAD_FMT_FLOAT)
{
/* KSDATAFORMAT_SUBTYPE_IEEE_FLOAT: 00000003-0000-0010-8000-00aa00389b71 */
*p++ = 0x03;
*p++ = 0x00;
*p++ = 0x00;
*p++ = 0x00;
*p++ = 0x00; *p++ = 0x00; *p++ = 0x10; *p++ = 0x00; *p++ = 0x80; *p++ = 0x00;
*p++ = 0x00; *p++ = 0xaa; *p++ = 0x00; *p++ = 0x38; *p++ = 0x9b; *p++ = 0x71;
} else {
/* KSDATAFORMAT_SUBTYPE_PCM: 00000001-0000-0010-8000-00aa00389b71 */
*p++ = 0x01;
*p++ = 0x00;
*p++ = 0x00;
*p++ = 0x00;
*p++ = 0x00; *p++ = 0x00; *p++ = 0x10; *p++ = 0x00; *p++ = 0x80; *p++ = 0x00;
*p++ = 0x00; *p++ = 0xaa; *p++ = 0x00; *p++ = 0x38; *p++ = 0x9b; *p++ = 0x71;
}
/* end WAVEFORMATEXTENSIBLE */
*p++ = 'd'; *p++ = 'a'; *p++ = 't'; *p++ = 'a';
word32 = data_size < MAXWAVESIZE ?
(unsigned long)data_size : (unsigned long)MAXWAVESIZE;
*p++ = (unsigned char)(word32 >> 0);
*p++ = (unsigned char)(word32 >> 8);
*p++ = (unsigned char)(word32 >> 16);
*p++ = (unsigned char)(word32 >> 24);
return fwrite(header, sizeof(header), 1, aufile->sndfile);
}
static int write_audio_16bit(audio_file *aufile, void *sample_buffer,
unsigned int samples)
{
int ret;
unsigned int i;
short *sample_buffer16 = (short*)sample_buffer;
char *data = malloc(samples*aufile->bits_per_sample*sizeof(char)/8);
aufile->total_samples += samples;
if (aufile->channels == 6 && aufile->channelMask)
{
for (i = 0; i < samples; i += aufile->channels)
{
short r1, r2, r3, r4, r5, r6;
r1 = sample_buffer16[i];
r2 = sample_buffer16[i+1];
r3 = sample_buffer16[i+2];
r4 = sample_buffer16[i+3];
r5 = sample_buffer16[i+4];
r6 = sample_buffer16[i+5];
sample_buffer16[i] = r2;
sample_buffer16[i+1] = r3;
sample_buffer16[i+2] = r1;
sample_buffer16[i+3] = r6;
sample_buffer16[i+4] = r4;
sample_buffer16[i+5] = r5;
}
}
for (i = 0; i < samples; i++)
{
data[i*2] = (char)(sample_buffer16[i] & 0xFF);
data[i*2+1] = (char)((sample_buffer16[i] >> 8) & 0xFF);
}
ret = fwrite(data, samples, aufile->bits_per_sample/8, aufile->sndfile);
if (data) free(data);
return ret;
}
static int write_audio_24bit(audio_file *aufile, void *sample_buffer,
unsigned int samples)
{
int ret;
unsigned int i;
long *sample_buffer24 = (long*)sample_buffer;
char *data = malloc(samples*aufile->bits_per_sample*sizeof(char)/8);
aufile->total_samples += samples;
if (aufile->channels == 6 && aufile->channelMask)
{
for (i = 0; i < samples; i += aufile->channels)
{
long r1, r2, r3, r4, r5, r6;
r1 = sample_buffer24[i];
r2 = sample_buffer24[i+1];
r3 = sample_buffer24[i+2];
r4 = sample_buffer24[i+3];
r5 = sample_buffer24[i+4];
r6 = sample_buffer24[i+5];
sample_buffer24[i] = r2;
sample_buffer24[i+1] = r3;
sample_buffer24[i+2] = r1;
sample_buffer24[i+3] = r6;
sample_buffer24[i+4] = r4;
sample_buffer24[i+5] = r5;
}
}
for (i = 0; i < samples; i++)
{
data[i*3] = (char)(sample_buffer24[i] & 0xFF);
data[i*3+1] = (char)((sample_buffer24[i] >> 8) & 0xFF);
data[i*3+2] = (char)((sample_buffer24[i] >> 16) & 0xFF);
}
ret = fwrite(data, samples, aufile->bits_per_sample/8, aufile->sndfile);
if (data) free(data);
return ret;
}
static int write_audio_32bit(audio_file *aufile, void *sample_buffer,
unsigned int samples)
{
int ret;
unsigned int i;
long *sample_buffer32 = (long*)sample_buffer;
char *data = malloc(samples*aufile->bits_per_sample*sizeof(char)/8);
aufile->total_samples += samples;
if (aufile->channels == 6 && aufile->channelMask)
{
for (i = 0; i < samples; i += aufile->channels)
{
long r1, r2, r3, r4, r5, r6;
r1 = sample_buffer32[i];
r2 = sample_buffer32[i+1];
r3 = sample_buffer32[i+2];
r4 = sample_buffer32[i+3];
r5 = sample_buffer32[i+4];
r6 = sample_buffer32[i+5];
sample_buffer32[i] = r2;
sample_buffer32[i+1] = r3;
sample_buffer32[i+2] = r1;
sample_buffer32[i+3] = r6;
sample_buffer32[i+4] = r4;
sample_buffer32[i+5] = r5;
}
}
for (i = 0; i < samples; i++)
{
data[i*4] = (char)(sample_buffer32[i] & 0xFF);
data[i*4+1] = (char)((sample_buffer32[i] >> 8) & 0xFF);
data[i*4+2] = (char)((sample_buffer32[i] >> 16) & 0xFF);
data[i*4+3] = (char)((sample_buffer32[i] >> 24) & 0xFF);
}
ret = fwrite(data, samples, aufile->bits_per_sample/8, aufile->sndfile);
if (data) free(data);
return ret;
}
static int write_audio_float(audio_file *aufile, void *sample_buffer,
unsigned int samples)
{
int ret;
unsigned int i;
float *sample_buffer_f = (float*)sample_buffer;
unsigned char *data = malloc(samples*aufile->bits_per_sample*sizeof(char)/8);
aufile->total_samples += samples;
if (aufile->channels == 6 && aufile->channelMask)
{
for (i = 0; i < samples; i += aufile->channels)
{
float r1, r2, r3, r4, r5, r6;
r1 = sample_buffer_f[i];
r2 = sample_buffer_f[i+1];
r3 = sample_buffer_f[i+2];
r4 = sample_buffer_f[i+3];
r5 = sample_buffer_f[i+4];
r6 = sample_buffer_f[i+5];
sample_buffer_f[i] = r2;
sample_buffer_f[i+1] = r3;
sample_buffer_f[i+2] = r1;
sample_buffer_f[i+3] = r6;
sample_buffer_f[i+4] = r4;
sample_buffer_f[i+5] = r5;
}
}
for (i = 0; i < samples; i++)
{
int exponent, mantissa, negative = 0 ;
float in = sample_buffer_f[i];
data[i*4] = 0; data[i*4+1] = 0; data[i*4+2] = 0; data[i*4+3] = 0;
if (in == 0.0)
continue;
if (in < 0.0)
{
in *= -1.0;
negative = 1;
}
in = (float)frexp(in, &exponent);
exponent += 126;
in *= (float)0x1000000;
mantissa = (((int)in) & 0x7FFFFF);
if (negative)
data[i*4+3] |= 0x80;
if (exponent & 0x01)
data[i*4+2] |= 0x80;
data[i*4] = mantissa & 0xFF;
data[i*4+1] = (mantissa >> 8) & 0xFF;
data[i*4+2] |= (mantissa >> 16) & 0x7F;
data[i*4+3] |= (exponent >> 1) & 0x7F;
}
ret = fwrite(data, samples, aufile->bits_per_sample/8, aufile->sndfile);
if (data) free(data);
return ret;
}