/***************************************************************************
* Copyright (C) 2008 by Paul Lutus *
* lutusp@arachnoid.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. *
***************************************************************************/
#include <iostream>
#include <string>
#include <sstream>
#include <cmath>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <stdio.h>
#include "mulaw_converter.h"
using namespace std;
class SoundSource {
string input_source;
int format;
unsigned long array_size,samples_per_second;
static const int data_formats[];
public:
SoundSource() {
input_source = "/dev/dsp";
array_size = 2048;
samples_per_second = 1000;
format = 0;
}
bool decode_comline(int argc,char **argv)
{
for(int i = 1;i < argc;i++) {
string arg = (string) argv[i];
if(arg.length() == 2 && arg[0] == '-') {
char c = arg[1];
switch (c) {
case 'h':
cerr << "Usage: [-i(nput, default " << input_source << ")]" << endl;
cerr << " [-f(ormat: 0=unsigned 16-bit, 1=signed 16-bit, 2=muLaw, default " << format << ")]" << endl;
cerr << " [-a(rray_size, must be a power of 2, default " << array_size << ")]" << endl;
cerr << " [-s(amples_per_second, default " << samples_per_second << ")]" << endl;
return true;
case 'a':
sscanf(argv[++i],"%lud",&array_size);
break;
case 's':
sscanf(argv[++i],"%lud",&samples_per_second);
break;
case 'f':
sscanf(argv[++i],"%d",&format);
break;
case 'i':
input_source = (string) argv[++i];
break;
}
}
}
return false;
}
template <class T> void scan_string(T& t,char* s) {
stringstream ss(s);
ss >> t;
}
long convert_pwr2(long v) {
double q = floor(log(v) / log(2));
q = pow(2.0,q);
return (long)q;
}
void set_options(int audio) {
int fmt = data_formats[format];
int r = ioctl ( audio, SNDCTL_DSP_SETFMT, &fmt );
unsigned long v = samples_per_second;
r = ioctl ( audio, SNDCTL_DSP_SPEED, &v );
// did the DSP accept our sample rate?
if ( v != samples_per_second )
{
// if not, accept the reply
samples_per_second = v;
cerr << "sound_source error: forced sample rate: " << samples_per_second << endl;
}
// this produces more reliable performance
int val = ( int ) ( ( 2 << 16 ) + log2 ( 512 ) );
r = ioctl ( audio, SNDCTL_DSP_SETFRAGMENT, &val );
}
void process_stream(int audio) {
double volume_constant = 1.0/1024.0;
double v;
unsigned short s;
unsigned char c;
// continuous output
while(true) {
cout << array_size << endl;
cout << samples_per_second << endl;
for(unsigned long t = 0;t < array_size;t++) {
if(format < 2) {
if(read ( audio,&s,2) == 2 ) {
if(format == 0) {
v = ( ( double ) s-32768.0 ) * volume_constant;
}
else {
v = ( double ) s * volume_constant;
}
cout << v << " " << 0 << endl;
}
}
else {
if(read ( audio,&c,1) == 1) {
v = MulawConverter::mu2linfast ( c ) * volume_constant;
cout << v << " " << 0 << endl;
}
}
}
}
}
void process(int argc,char **argv) {
if(decode_comline(argc,argv)) {
return;
}
// force entry to be a power of 2
array_size = convert_pwr2(array_size);
int audio = open (input_source.c_str(),O_RDONLY);
set_options(audio);
process_stream(audio);
}
};
const int SoundSource::data_formats[] =
{
AFMT_U16_LE, AFMT_S16_LE,AFMT_MU_LAW,0
};
int main(int argc, char **argv)
{
SoundSource ss;
ss.process(argc,argv);
return 0;
}