// 
//  read.cpp
//  MUSIC256a/CS476a - Lecture 4a
//  -----------------------------
//  Shows how to read an audio file using libsndfile
//  Uses libsndfile, by Erik de Castro Lopo
//  
//  Created by Jorge Herrera on 2011-10-17.
//
//  To compile this example you'll need libsndfile installed in your system.
//  Then type:
//
//  g++ read.cpp -o read -lsndfile


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

#define SAMPLE double
#define MY_SRATE 44100

using namespace std;


int main()
{

    const char* infilename="foo.wav";

    // struct that will hold the details of the file being read (sample rate, num channels. etc.)
    SF_INFO sfinfo ;

    // a pointer to the file to read
    SNDFILE * infile;

    // open the file for reading and get the 
    if ( !(infile = sf_open(infilename, SFM_READ, &sfinfo)) )
    {
        printf ("Not able to open input file %s.\n", infilename) ;
        // Print the error message from libsndfile.
        puts (sf_strerror (NULL)) ;
        // quit the program
        return  1 ;
    }

    // explore the file's info
    cout << "Channels: " << sfinfo.channels << endl;
    cout << "Frames: " << sfinfo.frames << endl;
    cout << "Sample Rate: " << sfinfo.samplerate << endl;
    cout << "Format: " << sfinfo.format << endl;

    // read the contents of the file in chunks of 512 samples
    const int buffSize = 512;
    double samples[buffSize];
    bool empty = false;
    do {
        // read the samples as doubles
        sf_count_t count = sf_read_double( infile, &samples[0], buffSize);

        // break if we reached the end of the file
        if ( count == 0) 
        {
            empty = true;
            continue;
        }

        // print the sample values to screen
        for(size_t i = 0; i < count; ++i)
        {
            cerr << samples[i] << " ";
        }
    } while( !empty );

    // don't forget to close the file	
    sf_close( infile );
	
    return 0;
}