// g++ -Iflac/include makenoise.cpp flac/lib/libFLAC++.a flac/lib/libFLAC.a -o makenoise
// g++ -Iflac/include makenoise.cpp flac/lib/libFLAC++.a flac/lib/libFLAC.a -o makenoise; ./makenoise; open flacout.flac

#include <iostream>
#include <stdlib.h>
#include <cmath>

#include <algorithm>
#include <vector>

#include "FLAC++/metadata.h"
#include "FLAC++/encoder.h"


using namespace std;

#define FS  (48000)
const double ampscl = 48000;

int main(int argc, const char * argv[])
{
	vector<FLAC__int32> data_l, data_r;
	
	size_t nsamps = 5*FS;
	data_l.resize(nsamps);
	data_r.resize(nsamps);
	
	double amp = ampscl;
	for(int j = 0; j < nsamps; ++j)
	{
		double t = (double)j/FS;
		double t2pi = t*M_PI*2.0;
		data_l[j] = (sin(t2pi*1e3)*amp + sin(t2pi*1.2e3)*amp)*sin(t2pi*(t2pi*12));
		data_r[j] = 0;//data_l[j];
	}
	
	
	FLAC::Encoder::File enc;
	
	bool ok = true;
	ok &= enc.set_verify(true);
	ok &= enc.set_compression_level(5);
	ok &= enc.set_channels(2);
	ok &= enc.set_bits_per_sample(24);
	ok &= enc.set_sample_rate(FS);
	ok &= enc.set_total_samples_estimate(data_l.size()*2);
	
	if(!ok) {
		cout << "Error: couldn't configure encoder" << endl;
		return EXIT_FAILURE;
	}
	
	FLAC__StreamEncoderInitStatus init_status = enc.init("flacout.flac");
	if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
		cout << "Error: couldn't init encoder" << endl;
		return EXIT_FAILURE;
	}
	
	FLAC__int32 * pcmData[2];
	pcmData[0] = &data_l[0];
	pcmData[1] = &data_r[0];
	if(!enc.process(pcmData, nsamps)) {
		cout << "Error while encoding" << endl;
	}
	
	enc.finish();
	
	return EXIT_SUCCESS;
}