SampleStream.h

/***** SampleStream.h *****/

// TODO: seek/rewind functions

#ifndef SAMPLESTREAM_H_
#define SAMPLESTREAM_H_

#include <SampleData.h>
#include <Bela.h>

#include <libraries/sndfile/sndfile.h>  // to load audio files
#include <iostream>
#include <cstdlib>

class SampleStream
{

public:
    
    SampleStream(const char* filename, int numChannels, int bufferLength);
    ~SampleStream();
    int openFile(const char* filename, int numChannels, int bufferLength);
    void fillBuffer();
    void processFrame();
    float getSample(int channel);
    int bufferNeedsFilled();
    void togglePlayback();
    void togglePlaybackWithFade(float fadeLengthInSeconds);
    void togglePlayback(int toggle);
    void togglePlaybackWithFade(int toggle, float fadeLengthInSeconds);
    int isPlaying();
    
private:

    // private libsndfile wrappers
    int getSamples(const char* file, float *buf, int channel, int startFrame, int endFrame);
    int getNumChannels(const char* file);
    int getNumFrames(const char* file);

    // Two buffers for each channel:
    // one of them loads the next chunk of audio while the other one is used for playback
    SampleData *gSampleBuf[2];
    // read pointer relative current buffer (range 0-BUFFER_LEN)
    // initialise at BUFFER_LEN to pre-load second buffer (see render())
    int gReadPtr;
    // read pointer relative to file, increments by BUFFER_LEN (see fillBuffer())
    int gBufferReadPtr;
    // keeps track of which buffer is currently active (switches between 0 and 1)
    int gActiveBuffer;
    // this variable will let us know if the buffer doesn't manage to load in time
    int gDoneLoadingBuffer;
    int gBufferLength;
    int gNumChannels;
    
    int gNumFramesInFile;
    const char* gFilename;
    int gBufferToBeFilled;
    int gPlaying;
    
    float gFadeAmount;
    float gFadeLengthInSeconds;
    int gFadeDirection;
    
    int gBusy;
    
    SNDFILE *sndfile = NULL;
        SF_INFO sfinfo ;
    
};

#endif // SAMPLESTREAM_H_