Adafruit_mp3.h

#ifndef LIB_ADAFRUIT_MP3_H
#define LIB_ADAFRUIT_MP3_H

#include "Arduino.h"
#include "arm_math.h"
#include "mp3dec.h"

//TODO: decide on a reasonable buffer size
#define OUTBUF_SIZE (16 * 1024)
#define INBUF_SIZE (16 * 1024)

#define BUFFER_LOWER_THRESH (8 * 1024)

#define MP3_TC TC2
#define MP3_IRQn TC2_IRQn
#define MP3_Handler TC2_Handler
#define MP3_GCLK_ID TC2_GCLK_ID

struct Adafruit_mp3_outbuf {
    volatile int count;
    int16_t buffer[OUTBUF_SIZE];    
};

class Adafruit_mp3 {
public:
    Adafruit_mp3() : hMP3Decoder() { inbufend = (inBuf + INBUF_SIZE); }
    ~Adafruit_mp3() { MP3FreeDecoder(hMP3Decoder); };
    bool begin();
    void setBufferCallback(int (*fun_ptr)(uint8_t *, int));
    void setSampleReadyCallback(void (*fun_ptr)(int16_t, int16_t));
        
    void play();
    void stop();
    void resume();
    
    int tick();
    
private:
    Tc *_tc;
    HMP3Decoder hMP3Decoder;
    
    volatile int bytesLeft;
    uint8_t *readPtr;
    uint8_t *writePtr;
    uint8_t inBuf[INBUF_SIZE];
    uint8_t *inbufend;
    bool playing = false;
    
    int (*bufferCallback)(uint8_t *, int);
    
};

#endif