first release

audioI2S/Audio.h

+/*
+ * Audio.h
+ *
+ *  Created on: 26.10.2018
+ *      Author: Wolle (schreibfaul1)
+ */
+
+#ifndef AUDIO_H_
+#define AUDIO_H_
+
+#include "Arduino.h"
+#include "SPI.h"
+#include "SD.h"
+#include "FS.h"
+#include "mp3_decoder/mp3_decoder.h"
+#include "driver/i2s.h"
+
+extern __attribute__((weak)) void audio_info(const char*);
+extern __attribute__((weak)) void audio_id3data(const char*); //ID3 metadata
+extern __attribute__((weak)) void audio_eof_mp3(const char*); //end of mp3 file
+
+
+class Audio {
+
+public:
+    Audio();
+    ~Audio();
+    bool connecttoSD(String sdfile);
+    bool loop();
+    uint32_t getFileSize();
+    uint32_t getFilePos();
+    bool setPinout(uint8_t BCLK, uint8_t LRC, uint8_t DOUT);
+    void stop();
+    void setVolume(uint8_t vol);
+    uint8_t getVolume();
+private:
+    void readID3Metadata();
+    void construct_OutBuf(int buffSizeSamples);
+    void destruct_OutBuf();
+    bool setSampleRate(int hz);
+    bool setBitsPerSample(int bits);
+    bool setChannels(int channels);
+    bool playSample(int16_t sample[2]) ;
+    int16_t Gain(int16_t s);
+    bool fill_InputBuf();
+
+private:
+    enum : int { APLL_AUTO = -1, APLL_ENABLE = 1, APLL_DISABLE = 0 };
+    enum : int { EXTERNAL_I2S = 0, INTERNAL_DAC = 1, INTERNAL_PDM = 2 };
+    typedef enum { LEFTCHANNEL=0, RIGHTCHANNEL=1 } SampleIndex;
+
+    const uint8_t volumetable[22]={   0,  1,  2,  3,  4 , 6 , 8, 10, 12, 14, 17,
+                                     20, 23, 27, 30 ,34, 38, 43 ,48, 52, 58, 64}; //22 elements
+
+    File            mp3file;
+    HMP3Decoder     helixMP3Decoder;                // Helix MP3 decoder
+
+    char            chbuf[256];
+    char            path[256];
+    uint8_t         inBuff[1600];                   // size inputBuffer
+    int16_t         m_buffValid;
+    int16_t         m_lastFrameEnd;
+    int16_t         m_outSample[1152 * 2];          // Interleaved L/R
+    int16_t         m_validSamples;
+    int16_t         m_curSample;
+    String          m_mp3title="";                  // the name of the file
+    boolean         m_f_unsync = false;
+    boolean         m_f_exthdr = false;             // ID3 extended header
+    int             m_id3Size=0;                    // length id3 tag
+    uint8_t         m_rev=0;                        // revision
+    uint8_t         m_BCLK=0;                       // Bit Clock
+    uint8_t         m_LRC=0;                        // Left/Right Clock
+    uint8_t         m_DOUT=0;                       // Data Out
+    uint8_t         m_vol=64;                       // volume
+    unsigned int    m_lastRate;
+    int             m_lastChannels;
+    bool            m_running;
+    int16_t         m_lastSample[2];
+    int             m_buffSize;                     // size outputBuffer
+    int16_t*        m_leftSample;
+    int16_t*        m_rightSample;
+    int             m_writePtr;                     // ptr outputBuffer
+    int             m_readPtr;                      // ptr outputBuffer
+    bool            m_filled;                       // outputBuffer
+    uint8_t         m_bps;                          // bitsPerSample
+    uint8_t         m_channels;
+    uint8_t         m_i2s_num= I2S_NUM_0;           // I2S_NUM_0 or I2S_NUM_1
+    size_t          m_bytesWritten=0;               // set in i2s_write() but not used
+};
+
+#endif /* AUDIO_H_ */