/*
  AudioGeneratorWAV
  Audio output generator that reads 8 and 16-bit WAV files
    
  Copyright (C) 2017  Earle F. Philhower, III

  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 3 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, see <http://www.gnu.org/licenses/>.
*/

#ifndef _AUDIOGENERATORWAV_H
#define _AUDIOGENERATORWAV_H

#include "AudioGenerator.h"

class AudioGeneratorWAV : public AudioGenerator
{
  public:
    AudioGeneratorWAV();
    virtual ~AudioGeneratorWAV() override;
    virtual bool begin(AudioFileSource *source, AudioOutput *output) override;
    virtual bool loop() override;
    virtual bool stop() override;
    virtual bool isRunning() override;
    void SetBufferSize(int sz) { buffSize = sz; }

  private:
    bool ReadU32(uint32_t *dest) { return file->read(reinterpret_cast<uint8_t*>(dest), 4); }
    bool ReadU16(uint16_t *dest) { return file->read(reinterpret_cast<uint8_t*>(dest), 2); }
    bool ReadU8(uint8_t *dest) { return file->read(reinterpret_cast<uint8_t*>(dest), 1); }
    bool GetBufferedData(int bytes, void *dest);
    bool ReadWAVInfo();

    
  protected:
    // WAV info
    uint16_t channels;
    uint32_t sampleRate;
    uint16_t bitsPerSample;
    
    uint32_t availBytes;

    // We need to buffer some data in-RAM to avoid doing 1000s of small reads
    uint32_t buffSize;
    uint8_t *buff;
    uint16_t buffPtr;
    uint16_t buffLen;
};

#endif