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Thread: WavFilePlayerUSB sample sketch==>Error(s)

  1. #1

    WavFilePlayerUSB sample sketch==>Error(s)

    I have Teensy Loader 1.56 and Arduino 1.8.16 versions installed. I ordered the https://www.amazon.com/gp/product/B0775YF36R dongle and the USBHost cable from PJRC. I soldered the host adapter header to the teensy and run from the samples the sketch "Serial" to verify USB hardware functionality. I connected to the USB Host cable my Plantronics Headset phone and they showed up connected on the Serial monitor. The dongle didn't work as expected, nothing showed on Serial. So, I am thinking it was my mistake by ordering something cheap. I will order something else. While doing more testing I run a sketch called WaveFilePlayerUSB; a series of error messages appear at the bottom of the screen after verifying the sketch included with the samples. I didn't change a single line on the sketch and I wonder what is causing the error .One thing I did was to change Tools-USB Type to Audio and no luck. Please, help. Thanks

    *********************
    play_usb_wav.cpp:34: error: 'USBFilesystem' does not name a type
    extern USBFilesystem MSC;
    ^
    C:\Users\Owner\AppData\Local\Temp\arduino_modified _sketch_676298\play_usb_wav.cpp: In member function 'bool AudioPlayUSBWav:lay(const char*)':
    play_usb_wav.cpp:81: error: 'MSC' was not declared in this scope
    wavfile = MSC.open(filename);
    ^
    WavFilePlayerUSB:50: error: 'USBDrive' does not name a type
    USBDrive msDrive1(myusb);
    ^
    WavFilePlayerUSB:53: error: 'USBFilesystem' does not name a type
    USBFilesystem MSC(myusb);



    *******************

    WavFilePlayerUSB: In function 'void setup()':
    WavFilePlayerUSB:86: error: 'MSC' was not declared in this scope
    if (!MSC.begin(&msDrive1)) {
    ^
    WavFilePlayerUSB:86: error: 'msDrive1' was not declared in this scope
    if (!MSC.begin(&msDrive1)) {
    ^
    ******

    'USBFilesystem' does not name a type



    ****************



    Code:
    #include <USBHost_t36.h>
    #include <Audio.h>
    #include "play_usb_wav.h" // Should be included in 'Audio.h'
    #include <Wire.h>
    #include <SPI.h>
    #include <SD.h>
    #include <SerialFlash.h>
    
    // Setup USBHost_t36 and as many HUB ports as needed.
    USBHost myusb;
    USBHub hub1(myusb);
    USBHub hub2(myusb);
    USBHub hub3(myusb);
    USBHub hub4(myusb);
    
    // Setup MSC for the number of USB Drives you are using. (Two for this example)
    // Mutiple  USB drives can be used. Hot plugging is supported. There is a slight
    // delay after a USB MSC device is plugged in. This is waiting for initialization
    // but after it is initialized ther should be no delay.
    USBDrive msDrive1(myusb);
    //USBDrive msDrive2(myusb);
    
    USBFilesystem MSC(myusb);
    
    AudioPlayUSBWav           playWav1;
    // Use one of these 3 output types: Digital I2S, Digital S/PDIF, or Analog DAC
    AudioOutputI2S           audioOutput;
    //AudioOutputSPDIF       audioOutput;
    //AudioOutputAnalog      audioOutput;
    AudioConnection          patchCord1(playWav1, 0, audioOutput, 0);
    AudioConnection          patchCord2(playWav1, 1, audioOutput, 1);
    AudioControlSGTL5000     sgtl5000_1;
    
    void setup() {
      Serial.begin(9600);
      // Wait for USB Serial
      while (!Serial) {
        yield();
      }
    
      // Start USBHost_t36, HUB(s) and USB devices.
      myusb.begin();
    
      // Audio connections require memory to work.  For more
      // detailed information, see the MemoryAndCpuUsage example
      AudioMemory(8);
    
      // Comment these out if not using the audio adaptor board.
      // This may wait forever if the SDA & SCL pins lack
      // pullup resistors
      sgtl5000_1.enable();
      sgtl5000_1.volume(0.50);
    
      // future USBFilesystem will begin automatically
      // begin(USBDrive) is a temporary feature
      if (!MSC.begin(&msDrive1)) {
        // stop here, but print a message repetitively
        while (1) {
          Serial.println("Unable to access the USB drive");
          delay(500);
        }
      }
    }
    
    void playFile(const char *filename)
    {
      Serial.print("Playing file: ");
      Serial.println(filename);
    
      // Start playing the file.  This sketch continues to
      // run while the file plays.
      playWav1.play(filename);
    
      // A brief delay for the library read WAV info
      delay(5);
    
      // Simply wait for the file to finish playing.
      while (playWav1.isPlaying()) {
        // uncomment these lines if you audio shield
        // has the optional volume pot soldered
        //float vol = analogRead(15);
        //vol = vol / 1024;
        //sgtl5000_1.volume(vol);
      }
    }
    
    
    void loop() {
      playFile("ARMAGED.WAV");  // filenames are always uppercase 8.3 format
      delay(500);
      playFile("SDTEST1.WAV");  // filenames are always uppercase 8.3 format
      delay(500);
      playFile("SDTEST2.WAV");
      delay(500);
      playFile("SDTEST3.WAV");
      delay(500);
      playFile("SDTEST4.WAV");
      delay(1500);
    }



    Code:
     // Modified for use with USB mass storage drives 2020 Warren Watson
    
    #include <Arduino.h>
    #include <USBHost_t36.h>
    #include "play_usb_wav.h"
    #include "spi_interrupt.h"
    
    extern USBFilesystem MSC;
    
    
    #define STATE_DIRECT_8BIT_MONO		0  // playing mono at native sample rate
    #define STATE_DIRECT_8BIT_STEREO	1  // playing stereo at native sample rate
    #define STATE_DIRECT_16BIT_MONO		2  // playing mono at native sample rate
    #define STATE_DIRECT_16BIT_STEREO	3  // playing stereo at native sample rate
    #define STATE_CONVERT_8BIT_MONO		4  // playing mono, converting sample rate
    #define STATE_CONVERT_8BIT_STEREO	5  // playing stereo, converting sample rate
    #define STATE_CONVERT_16BIT_MONO	6  // playing mono, converting sample rate
    #define STATE_CONVERT_16BIT_STEREO	7  // playing stereo, converting sample rate
    #define STATE_PARSE1			8  // looking for 20 byte ID header
    #define STATE_PARSE2			9  // looking for 16 byte format header
    #define STATE_PARSE3			10 // looking for 8 byte data header
    #define STATE_PARSE4			11 // ignoring unknown chunk after "fmt "
    #define STATE_PARSE5			12 // ignoring unknown chunk before "fmt "
    #define STATE_STOP			13
    
    void AudioPlayUSBWav::begin(void)
    {
    	state = STATE_STOP;
    	state_play = STATE_STOP;
    	data_length = 0;
    	if (block_left) {
    		release(block_left);
    		block_left = NULL;
    	}
    	if (block_right) {
    		release(block_right);
    		block_right = NULL;
    	}
    }
    
    
    bool AudioPlayUSBWav::play(const char *filename)
    {
    	stop();
    	bool irq = false;
    	if (NVIC_IS_ENABLED(IRQ_SOFTWARE)) {
    		NVIC_DISABLE_IRQ(IRQ_SOFTWARE);
    		irq = true;
    	}
    #if defined(HAS_KINETIS_SDHC)
    	if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStartUsingSPI();
    #else
    	AudioStartUsingSPI();
    #endif
    	wavfile = MSC.open(filename);
    	if (!wavfile) {
    #if defined(HAS_KINETIS_SDHC)
    		if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStopUsingSPI();
    #else
    		AudioStopUsingSPI();
    #endif
    		if (irq) NVIC_ENABLE_IRQ(IRQ_SOFTWARE);
    		return false;
    	}
    	buffer_length = 0;
    	buffer_offset = 0;
    	state_play = STATE_STOP;
    	data_length = 20;
    	header_offset = 0;
    	state = STATE_PARSE1;
    	if (irq) NVIC_ENABLE_IRQ(IRQ_SOFTWARE);
    	return true;
    }
    
    void AudioPlayUSBWav::stop(void)
    {
    	bool irq = false;
    	if (NVIC_IS_ENABLED(IRQ_SOFTWARE)) {
    		NVIC_DISABLE_IRQ(IRQ_SOFTWARE);
    		irq = true;
    	}
    	if (state != STATE_STOP) {
    		audio_block_t *b1 = block_left;
    		block_left = NULL;
    		audio_block_t *b2 = block_right;
    		block_right = NULL;
    		state = STATE_STOP;
    		if (b1) release(b1);
    		if (b2) release(b2);
    		wavfile.close();
    #if defined(HAS_KINETIS_SDHC)
    		if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStopUsingSPI();
    #else
    		AudioStopUsingSPI();
    #endif
    	}
    	if (irq) NVIC_ENABLE_IRQ(IRQ_SOFTWARE);
    }
    
    
    void AudioPlayUSBWav::update(void)
    {
    	int32_t n;
    
    	// only update if we're playing
    	if (state == STATE_STOP) return;
    
    	// allocate the audio blocks to transmit
    	block_left = allocate();
    	if (block_left == NULL) return;
    	if (state < 8 && (state & 1) == 1) {
    		// if we're playing stereo, allocate another
    		// block for the right channel output
    		block_right = allocate();
    		if (block_right == NULL) {
    			release(block_left);
    			return;
    		}
    	} else {
    		// if we're playing mono or just parsing
    		// the WAV file header, no right-side block
    		block_right = NULL;
    	}
    	block_offset = 0;
    
    	//Serial.println("update");
    
    	// is there buffered data?
    	n = buffer_length - buffer_offset;
    	if (n > 0) {
    		// we have buffered data
    		if (consume(n)) return; // it was enough to transmit audio
    	}
    
    	// we only get to this point when buffer[512] is empty
    	if (state != STATE_STOP && wavfile.available()) {
    		// we can read more data from the file...
    		readagain:
    		buffer_length = wavfile.read(buffer, 2048);
    		if (buffer_length == 0) goto end;
    		buffer_offset = 0;
    		bool parsing = (state >= 8);
    		bool txok = consume(buffer_length);
    		if (txok) {
    			if (state != STATE_STOP) return;
    		} else {
    			if (state != STATE_STOP) {
    				if (parsing && state < 8) goto readagain;
    				else goto cleanup;
    			}
    		}
    	}
    end:	// end of file reached or other reason to stop
    	wavfile.close();
    #if defined(HAS_KINETIS_SDHC)
    	if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStopUsingSPI();
    #else
    	AudioStopUsingSPI();
    #endif
    	state_play = STATE_STOP;
    	state = STATE_STOP;
    cleanup:
    	if (block_left) {
    		if (block_offset > 0) {
    			for (uint32_t i=block_offset; i < AUDIO_BLOCK_SAMPLES; i++) {
    				block_left->data[i] = 0;
    			}
    			transmit(block_left, 0);
    			if (state < 8 && (state & 1) == 0) {
    				transmit(block_left, 1);
    			}
    		}
    		release(block_left);
    		block_left = NULL;
    	}
    	if (block_right) {
    		if (block_offset > 0) {
    			for (uint32_t i=block_offset; i < AUDIO_BLOCK_SAMPLES; i++) {
    				block_right->data[i] = 0;
    			}
    			transmit(block_right, 1);
    		}
    		release(block_right);
    		block_right = NULL;
    	}
    }
    
    
    // https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
    
    // Consume already buffered data.  Returns true if audio transmitted.
    bool AudioPlayUSBWav::consume(uint32_t size)
    {
    	uint32_t len;
    	uint8_t lsb, msb;
    	const uint8_t *p;
    
    	p = buffer + buffer_offset;
    start:
    	if (size == 0) return false;
    #if 0
    	Serial.print("AudioPlaySdWav consume, ");
    	Serial.print("size = ");
    	Serial.print(size);
    	Serial.print(", buffer_offset = ");
    	Serial.print(buffer_offset);
    	Serial.print(", data_length = ");
    	Serial.print(data_length);
    	Serial.print(", space = ");
    	Serial.print((AUDIO_BLOCK_SAMPLES - block_offset) * 2);
    	Serial.print(", state = ");
    	Serial.println(state);
    #endif
    	switch (state) {
    	  // parse wav file header, is this really a .wav file?
    	  case STATE_PARSE1:
    		len = data_length;
    		if (size < len) len = size;
    		memcpy((uint8_t *)header + header_offset, p, len);
    		header_offset += len;
    		buffer_offset += len;
    		data_length -= len;
    		if (data_length > 0) return false;
    		// parse the header...
    		if (header[0] == 0x46464952 && header[2] == 0x45564157) {
    			//Serial.println("is wav file");
    			if (header[3] == 0x20746D66) {
    				// "fmt " header
    				if (header[4] < 16) {
    					// WAV "fmt " info must be at least 16 bytes
    					break;
    				}
    				if (header[4] > sizeof(header)) {
    					// if such .wav files exist, increasing the
    					// size of header[] should accomodate them...
    					//Serial.println("WAVEFORMATEXTENSIBLE too long");
    					break;
    				}
    				//Serial.println("header ok");
    				header_offset = 0;
    				state = STATE_PARSE2;
    			} else {
    				// first chuck is something other than "fmt "
    				//Serial.print("skipping \"");
    				//Serial.printf("\" (%08X), ", __builtin_bswap32(header[3]));
    				//Serial.print(header[4]);
    				//Serial.println(" bytes");
    				header_offset = 12;
    				state = STATE_PARSE5;
    			}
    			p += len;
    			size -= len;
    			data_length = header[4];
    			goto start;
    		}
    		//Serial.println("unknown WAV header");
    		break;
    
    	  // check & extract key audio parameters
    	  case STATE_PARSE2:
    		len = data_length;
    		if (size < len) len = size;
    		memcpy((uint8_t *)header + header_offset, p, len);
    		header_offset += len;
    		buffer_offset += len;
    		data_length -= len;
    		if (data_length > 0) return false;
    		if (parse_format()) {
    			//Serial.println("audio format ok");
    			p += len;
    			size -= len;
    			data_length = 8;
    			header_offset = 0;
    			state = STATE_PARSE3;
    			goto start;
    		}
    		//Serial.println("unknown audio format");
    		break;
    
    	  // find the data chunk
    	  case STATE_PARSE3: // 10
    		len = data_length;
    		if (size < len) len = size;
    		memcpy((uint8_t *)header + header_offset, p, len);
    		header_offset += len;
    		buffer_offset += len;
    		data_length -= len;
    		if (data_length > 0) return false;
    		//Serial.print("chunk id = ");
    		//Serial.print(header[0], HEX);
    		//Serial.print(", length = ");
    		//Serial.println(header[1]);
    		p += len;
    		size -= len;
    		data_length = header[1];
    		if (header[0] == 0x61746164) {
    			//Serial.print("wav: found data chunk, len=");
    			//Serial.println(data_length);
    			// TODO: verify offset in file is an even number
    			// as required by WAV format.  abort if odd.  Code
    			// below will depend upon this and fail if not even.
    			leftover_bytes = 0;
    			state = state_play;
    			if (state & 1) {
    				// if we're going to start stereo
    				// better allocate another output block
    				block_right = allocate();
    				if (!block_right) return false;
    			}
    			total_length = data_length;
    		} else {
    			state = STATE_PARSE4;
    		}
    		goto start;
    
    	  // ignore any extra unknown chunks (title & artist info)
    	  case STATE_PARSE4: // 11
    		if (size < data_length) {
    			data_length -= size;
    			buffer_offset += size;
    			return false;
    		}
    		p += data_length;
    		size -= data_length;
    		buffer_offset += data_length;
    		data_length = 8;
    		header_offset = 0;
    		state = STATE_PARSE3;
    		//Serial.println("consumed unknown chunk");
    		goto start;
    
    	  // skip past "junk" data before "fmt " header
    	  case STATE_PARSE5:
    		len = data_length;
    		if (size < len) len = size;
    		buffer_offset += len;
    		data_length -= len;
    		if (data_length > 0) return false;
    		p += len;
    		size -= len;
    		data_length = 8;
    		state = STATE_PARSE1;
    		goto start;
    
    	  // playing mono at native sample rate
    	  case STATE_DIRECT_8BIT_MONO:
    		return false;
    
    	  // playing stereo at native sample rate
    	  case STATE_DIRECT_8BIT_STEREO:
    		return false;
    
    	  // playing mono at native sample rate
    	  case STATE_DIRECT_16BIT_MONO:
    		if (size > data_length) size = data_length;
    		data_length -= size;
    		while (1) {
    			lsb = *p++;
    			msb = *p++;
    			size -= 2;
    			block_left->data[block_offset++] = (msb << 8) | lsb;
    			if (block_offset >= AUDIO_BLOCK_SAMPLES) {
    				transmit(block_left, 0);
    				transmit(block_left, 1);
    				release(block_left);
    				block_left = NULL;
    				data_length += size;
    				buffer_offset = p - buffer;
    				if (block_right) release(block_right);
    				if (data_length == 0) state = STATE_STOP;
    				return true;
    			}
    			if (size == 0) {
    				if (data_length == 0) break;
    				return false;
    			}
    		}
    		//Serial.println("end of file reached");
    		// end of file reached
    		if (block_offset > 0) {
    			// TODO: fill remainder of last block with zero and transmit
    		}
    		state = STATE_STOP;
    		return false;
    
    	  // playing stereo at native sample rate
    	  case STATE_DIRECT_16BIT_STEREO:
    		if (size > data_length) size = data_length;
    		data_length -= size;
    		if (leftover_bytes) {
    			block_left->data[block_offset] = header[0];
    //PAH fix problem with left+right channels being swapped
    			leftover_bytes = 0;
    			goto right16;
    		}
    		while (1) {
    			lsb = *p++;
    			msb = *p++;
    			size -= 2;
    			if (size == 0) {
    				if (data_length == 0) break;
    				header[0] = (msb << 8) | lsb;
    				leftover_bytes = 2;
    				return false;
    			}
    			block_left->data[block_offset] = (msb << 8) | lsb;
    			right16:
    			lsb = *p++;
    			msb = *p++;
    			size -= 2;
    			block_right->data[block_offset++] = (msb << 8) | lsb;
    			if (block_offset >= AUDIO_BLOCK_SAMPLES) {
    				transmit(block_left, 0);
    				release(block_left);
    				block_left = NULL;
    				transmit(block_right, 1);
    				release(block_right);
    				block_right = NULL;
    				data_length += size;
    				buffer_offset = p - buffer;
    				if (data_length == 0) state = STATE_STOP;
    				return true;
    			}
    			if (size == 0) {
    				if (data_length == 0) break;
    				leftover_bytes = 0;
    				return false;
    			}
    		}
    		// end of file reached
    		if (block_offset > 0) {
    			// TODO: fill remainder of last block with zero and transmit
    		}
    		state = STATE_STOP;
    		return false;
    
    	  // playing mono, converting sample rate
    	  case STATE_CONVERT_8BIT_MONO :
    		return false;
    
    	  // playing stereo, converting sample rate
    	  case STATE_CONVERT_8BIT_STEREO:
    		return false;
    
    	  // playing mono, converting sample rate
    	  case STATE_CONVERT_16BIT_MONO:
    		return false;
    
    	  // playing stereo, converting sample rate
    	  case STATE_CONVERT_16BIT_STEREO:
    		return false;
    
    	  // ignore any extra data after playing
    	  // or anything following any error
    	  case STATE_STOP:
    		return false;
    
    	  // this is not supposed to happen!
    	  //default:
    		//Serial.println("AudioPlaySdWav, unknown state");
    	}
    	state_play = STATE_STOP;
    	state = STATE_STOP;
    	return false;
    }
    
    
    /*
    00000000  52494646 66EA6903 57415645 666D7420  RIFFf.i.WAVEfmt 
    00000010  10000000 01000200 44AC0000 10B10200  ........D.......
    00000020  04001000 4C495354 3A000000 494E464F  ....LIST:...INFO
    00000030  494E414D 14000000 49205761 6E742054  INAM....I Want T
    00000040  6F20436F 6D65204F 76657200 49415254  o Come Over.IART
    00000050  12000000 4D656C69 73736120 45746865  ....Melissa Ethe
    00000060  72696467 65006461 746100EA 69030100  ridge.data..i...
    00000070  FEFF0300 FCFF0400 FDFF0200 0000FEFF  ................
    00000080  0300FDFF 0200FFFF 00000100 FEFF0300  ................
    00000090  FDFF0300 FDFF0200 FFFF0100 0000FFFF  ................
    */
    
    
    
    
    
    // SD library on Teensy3 at 96 MHz
    //  256 byte chunks, speed is 443272 bytes/sec
    //  512 byte chunks, speed is 468023 bytes/sec
    
    #define B2M_44100 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT) // 97352592
    #define B2M_22050 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT * 2.0)
    #define B2M_11025 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT * 4.0)
    
    bool AudioPlayUSBWav::parse_format(void)
    {
    	uint8_t num = 0;
    	uint16_t format;
    	uint16_t channels;
    	uint32_t rate, b2m;
    	uint16_t bits;
    
    	format = header[0];
    	//Serial.print("  format = ");
    	//Serial.println(format);
    	if (format != 1) return false;
    
    	rate = header[1];
    	//Serial.print("  rate = ");
    	//Serial.println(rate);
    	if (rate == 44100) {
    		b2m = B2M_44100;
    	} else if (rate == 22050) {
    		b2m = B2M_22050;
    		num |= 4;
    	} else if (rate == 11025) {
    		b2m = B2M_11025;
    		num |= 4;
    	} else {
    		return false;
    	}
    
    	channels = header[0] >> 16;
    	//Serial.print("  channels = ");
    	//Serial.println(channels);
    	if (channels == 1) {
    	} else if (channels == 2) {
    		b2m >>= 1;
    		num |= 1;
    	} else {
    		return false;
    	}
    
    	bits = header[3] >> 16;
    	//Serial.print("  bits = ");
    	//Serial.println(bits);
    	if (bits == 8) {
    	} else if (bits == 16) {
    		b2m >>= 1;
    		num |= 2;
    	} else {
    		return false;
    	}
    
    	bytes2millis = b2m;
    	//Serial.print("  bytes2millis = ");
    	//Serial.println(b2m);
    
    	// we're not checking the byte rate and block align fields
    	// if they're not the expected values, all we could do is
    	// return false.  Do any real wav files have unexpected
    	// values in these other fields?
    	state_play = num;
    	return true;
    }
    
    
    bool AudioPlayUSBWav::isPlaying(void)
    {
    	uint8_t s = *(volatile uint8_t *)&state;
    	return (s < 8);
    }
    
    uint32_t AudioPlayUSBWav::positionMillis(void)
    {
    	uint8_t s = *(volatile uint8_t *)&state;
    	if (s >= 8) return 0;
    	uint32_t tlength = *(volatile uint32_t *)&total_length;
    	uint32_t dlength = *(volatile uint32_t *)&data_length;
    	uint32_t offset = tlength - dlength;
    	uint32_t b2m = *(volatile uint32_t *)&bytes2millis;
    	return ((uint64_t)offset * b2m) >> 32;
    }
    
    
    uint32_t AudioPlayUSBWav::lengthMillis(void)
    {
    	uint8_t s = *(volatile uint8_t *)&state;
    	if (s >= 8) return 0;
    	uint32_t tlength = *(volatile uint32_t *)&total_length;
    	uint32_t b2m = *(volatile uint32_t *)&bytes2millis;
    	return ((uint64_t)tlength * b2m) >> 32;
    }
    Code:
    // Modified for use with USB mass storage drives 2020 Warren Watson
    
    #ifndef play_usb_wav_h_
    #define play_usb_wav_h_
    
    #include "Arduino.h"
    #include "AudioStream.h"
    #include "FS.h"
    //#include <UsbMscFat.h>
    
    class AudioPlayUSBWav : public AudioStream
    {
    public:
    	AudioPlayUSBWav(void) : AudioStream(0, NULL), block_left(NULL), block_right(NULL) { begin(); }
    	void begin(void);
    	bool play(const char *filename);
    	void stop(void);
    	bool isPlaying(void);
    	uint32_t positionMillis(void);
    	uint32_t lengthMillis(void);
    	virtual void update(void);
    private:
    	File wavfile;
    	bool consume(uint32_t size);
    	bool parse_format(void);
    	uint32_t header[10];		// temporary storage of wav header data
    	uint32_t data_length;		// number of bytes remaining in current section
    	uint32_t total_length;		// number of audio data bytes in file
    	uint32_t bytes2millis;
    	audio_block_t *block_left;
    	audio_block_t *block_right;
    	uint16_t block_offset;		// how much data is in block_left & block_right
    	uint8_t buffer[2048]__attribute__((aligned(0x4)));		// buffer one block of data
    	uint16_t buffer_offset;		// where we're at consuming "buffer"
    	uint16_t buffer_length;		// how much data is in "buffer" (512 until last read)
    	uint8_t header_offset;		// number of bytes in header[]
    	uint8_t state;
    	uint8_t state_play;
    	uint8_t leftover_bytes;
    };
    
    #endif

  2. #2

  3. #3
    Thanks so much!!

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