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arduino-audio-tools
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Parser for MP3 ID3 Meta Data: The goal is to implement a simple API which provides the title, artist, albmum and the Genre. More...
Classes | |
| class | A2DPStream |
| Stream support for A2DP: begin(TX_MODE) uses a2dp_source - begin(RX_MODE) a a2dp_sink The data is in int16_t with 2 channels at 44100 hertz. More... | |
| class | AACDecoderFDK |
| Audio Decoder which decodes AAC into a PCM stream This is basically just a wrapper using https://github.com/pschatzmann/arduino-fdk-aac which uses AudioBaseInfo and provides the handlig of AudioBaseInfo changes. More... | |
| class | AACDecoderHelix |
| AAC Decoder using libhelix: https://github.com/pschatzmann/arduino-libhelix This is basically just a simple wrapper to provide AudioBaseInfo and AudioBaseInfoDependent. More... | |
| class | AACEncoderFDK |
| Encodes PCM data to the AAC format and writes the result to a stream This is basically just a wrapper using https://github.com/pschatzmann/arduino-fdk-aac. More... | |
| class | AnalogAudio |
| A very fast ADC and DAC using the ESP32 I2S interface. More... | |
| class | AnalogAudioStream |
| We support the Stream interface for the AnalogAudio class. More... | |
| class | AnalogConfig |
| ESP32 specific configuration for i2s input via adc. The default input pin is GPIO34. We always use int16_t values. The default output pins are GPIO25 and GPIO26! More... | |
| struct | AudioBaseInfo |
| Basic Audio information which drives e.g. I2S. More... | |
| class | AudioBaseInfoDependent |
| Supports changes to the sampling rate, bits and channels. More... | |
| class | AudioBaseInfoSource |
| Supports the subscription to audio change notifications. More... | |
| class | AudioDecoder |
| Docoding of encoded audio into PCM data. More... | |
| class | AudioEncoder |
| Encoding of PCM data. More... | |
| class | AudioEncoderServer |
| A simple Arduino Webserver which streams the audio using the indicated encoder.. This class is based on the WiFiServer class. All you need to do is to provide the data with a callback method or from a Stream. More... | |
| struct | AudioInfoLAME |
| LAME parameters. More... | |
| class | AudioLogger |
| A simple Logger that writes messages dependent on the log level. More... | |
| class | AudioOutputStream |
| Construct a new Encoded Stream object which is supporting defined Audio File types. More... | |
| class | AudioOutputWithCallback |
| ESP8266Audio AudioOutput class which stores the data in a temporary buffer. The buffer can be consumed e.g. by a callback function by calling read();. More... | |
| class | AudioPlayer |
| Implements a simple audio player which supports the following commands: More... | |
| class | AudioPrint |
| Abstract Audio Ouptut class. More... | |
| class | AudioServer |
| A simple Arduino Webserver which streams the result This class is based on the WiFiServer class. All you need to do is to provide the data with a callback method or from an Arduino Stream. More... | |
| class | AudioSource |
| Abstract Audio Data Source which is used by the Audio Players. More... | |
| class | AudioSourceCallback |
| Callback Audio Data Source which is used by the Audio Players. More... | |
| class | AudioSourceSdFat |
| AudioSource using an SD card as data source. This class is based on https://github.com/greiman/SdFat. More... | |
| class | AudioSourceURL |
| Audio Source which provides the data via the network from an URL. More... | |
| class | AudioUSB |
| Stream support for mbed USBAudio https://os.mbed.com/docs/mbed-os/v6.10/mbed-os-api-doxy/class_u_s_b_audio.html. More... | |
| class | AudioUtils |
| Tools for calculating timer values. More... | |
| class | AudioWAVServer |
| A simple Arduino Webserver which streams the audio as WAV data. This class is based on the AudioEncodedServer class. All you need to do is to provide the data with a callback method or from a Stream. More... | |
| class | AudioWriter |
| E.g. used by Encoders and Decoders. More... | |
| class | BaseBuffer |
| Shared functionality of all buffers. More... | |
| class | BaseConverter |
| Abstract Base class for Converters A converter is processing the data in the indicated array. More... | |
| class | BufferedStream |
| The Arduino Stream supports operations on single characters. This is usually not the best way to push audio information, but we will support it anyway - by using a buffer. On reads: if the buffer is empty it gets refilled - for writes if it is full it gets flushed. More... | |
| class | CallbackAudioStream |
| Callback driven Audio Source (rx_tx_mode==RX_MODE) or Audio Sink (rx_tx_mode==TX_MODE). This class allows to to integrate external libraries in order to consume or generate a data stream. More... | |
| struct | CallbackAudioStreamInfo |
| CallbackAudioStream Configuration. More... | |
| class | CallbackConverter |
| Converts e.g. 24bit data to the indicated bigger data type. More... | |
| class | CallbackStream |
| AudioOutput class which stores the data in a temporary buffer. The buffer can be consumed e.g. by a callback function by calling read();. More... | |
| class | ChannelConverter |
| Covnerts the data from T src[][2] to a Frame array. More... | |
| class | CodecNOP |
| Dummpy no implmentation Codec. This is used so that we can initialize some pointers to decoders and encoders to make sure that they do not point to null. More... | |
| class | ConverterAutoCenter |
| Makes sure that the avg of the signal is set to 0. More... | |
| class | ConverterFillLeftAndRight |
| Make sure that both channels contain any data. More... | |
| class | ConverterScaler |
| Multiplies the values with the indicated factor adds the offset and clips at maxValue. To mute use a factor of 0.0! More... | |
| class | ConverterSwitchLeftAndRight |
| Switches the left and right channel. More... | |
| class | ConverterToInternalDACFormat |
| special case for internal DAC output, the incomming PCM buffer needs to be converted from signed 16bit to unsigned More... | |
| class | CsvStream |
| Stream Wrapper which can be used to print the values as readable ASCII to the screen to be analyzed in the Serial Plotter The frames are separated by a new line. The channels in one frame are separated by a ,. More... | |
| class | DACInfo |
| Config info for DeltaSigma DAC. More... | |
| class | DACOut |
| Output method for DeltaSigma DAC. More... | |
| class | DeltaSigmaDAC |
| Software Implementation of a Delta Sigma DAC - The advantage of this implementation is that it works with any digital output pin and that it supports as many channels as necessary! The logic is inspired by Earl Phil Howers ESP8266Audio's AudioOutputI2SNoDAC implementation. More... | |
| class | EncodedAudioStream |
| A more natural Stream class to process encoded data (aac, wav, mp3...). More... | |
| class | ExternalBufferStream |
| A Stream backed by a SingleBufferStream. We assume that the memory is externally allocated and that we can submit only full buffer records, which are then available for reading. More... | |
| class | GeneratedSoundStream |
| Source for reading generated tones. Please note. More... | |
| class | HexDumpStream |
| Creates a Hex Dump. More... | |
| class | HttpChunkReader |
| Http might reply with chunks. So we need to dechunk the data. see https://en.wikipedia.org/wiki/Chunked_transfer_encoding. More... | |
| class | HttpHeader |
| In a http request and reply we need to process header information. With this API we can define and query the header information. The individual header lines are stored in a vector. This is the common functionality for the HttpRequest and HttpReplyHeader subclasses. More... | |
| struct | HttpHeaderLine |
| A individual key - value header line. More... | |
| class | HttpLineReader |
| We read a single line. A terminating 0 is added to the string to make it compliant for c string functions. More... | |
| class | HttpReplyHeader |
| Reading and Writing of Http Replys. More... | |
| class | HttpRequest |
| Simple API to process get, put, post, del http requests I tried to use Arduino HttpClient, but I did not manage to extract the mime type from streaming get requests. More... | |
| class | HttpRequestHeader |
| Reading and writing of Http Requests. More... | |
| class | I2S |
| A Simple I2S interface class for multiple Architectures that supports the reading and writing with a defined data type. More... | |
| class | I2SBase |
| Basic I2S API - for the ESP32. If we receive 1 channel, we expand the result to 2 channels. More... | |
| class | I2SConfig |
| configuration for all common i2s settings More... | |
| class | I2SStream |
| We support the Stream interface for the I2S access. In addition we allow a separate mute pin which might also be used to drive a LED... More... | |
| struct | ID3v1 |
| ID3 verion 1 TAG (130 bytes) More... | |
| struct | ID3v1Enhanced |
| ID3 verion 1 Enchanced TAG (227 bytes) More... | |
| struct | ID3v2 |
| ID3 verion 2 TAG Header (10 bytes) More... | |
| struct | ID3v2Frame |
| ID3 verion 2 Tag. More... | |
| struct | ID3v2FrameString |
| ID3 verion 2 Tag. More... | |
| class | MemoryStream |
| A simple Stream implementation which is backed by allocated memory. More... | |
| class | MetaDataID3 |
| Simple ID3 Meta Data Parser which supports ID3 V1 and V2 and implements the Stream interface. You just need to set the callback(s) to receive the result and copy the audio data to this stream. More... | |
| class | MetaDataID3Base |
| ID3 Meta Data Common Functionality. More... | |
| class | MetaDataID3V1 |
| Simple ID3 Meta Data API which supports ID3 V1. More... | |
| class | MetaDataID3V2 |
| Simple ID3 Meta Data API which supports ID3 V2: We only support the "TALB", "TOPE", "TIT2", "TCON" tags. More... | |
| struct | MozziConfig |
| Mozzi Configuration for input or output stream. More... | |
| class | MozziGenerator |
| Support for https://sensorium.github.io/Mozzi/ Define your updateControl() method. Define your updateAudio() method. Start by calling begin(control_rate) do not call audioHook(); in the loop ! More... | |
| class | MozziStream |
| We use the output functionality of Mozzi to output audio data. We expect the data as array of int16_t with one or two channels. Though we support the setting of a sample rate, we recommend to use the default sample rate from Mozzi which is available with the AUDIO_RATE define. More... | |
| class | MP3DecoderHelix |
| MP3 Decoder using libhelix: https://github.com/pschatzmann/arduino-libhelix This is basically just a simple wrapper to provide AudioBaseInfo and AudioBaseInfoDependent. More... | |
| class | MP3DecoderMAD |
| MP3 Decoder using https://github.com/pschatzmann/arduino-libmad. More... | |
| class | MP3EncoderLAME |
| Encodes PCM data to the MP3 format and writes the result to a stream This is basically just a wrapper using https://github.com/pschatzmann/arduino-liblame. More... | |
| class | MultiConverter |
| Combines multiple converters. More... | |
| class | MusicalNotes |
| Determination of the frequency of a music note. More... | |
| struct | Nano_BLE_freq_info |
| struct | Nano_BLE_ratio_info |
| class | NBuffer |
| A lock free N buffer. If count=2 we create a DoubleBuffer, if count=3 a TripleBuffer etc. More... | |
| class | NoiseGenerator |
| Generates a random noise sound with the help of rand() function. More... | |
| class | NOPConverter |
| Dummy converter which does nothing. More... | |
| class | NullStream |
| The Arduino Stream which provides silence and simulates a null device when used as audio target. More... | |
| class | NumberReader |
| Reads n numbers from an Arduino Stream. More... | |
| class | OversamplingDAC |
| Abstract Software Implementation of an Oversampling DAC. More... | |
| class | OversamplingDAC32 |
| Software Implementation of a Simple DAC - We quantize a digital int16_t sample my mapping the value to the range of 0b0 to 0b11111111111111111111111111111111, where the intensity is represented by the number of ones. This gives an overall resultion of 5 bits and just uses one single timer. More... | |
| struct | PicoChannelOut |
| Rasperry Pico Channel to pin assignments. More... | |
| struct | PinInfoESP32 |
| Information for a PIN. More... | |
| class | PortAudioConfig |
| PortAudio information. More... | |
| class | PortAudioStream |
| Arduino Audio Stream using PortAudio. More... | |
| class | PWMAudioStreamAVR |
| Experimental: Audio output to PWM pins for the AVR. The AVR supports only up to 2 channels. More... | |
| class | PWMAudioStreamBase |
| Common functionality for PWM output. More... | |
| class | PWMAudioStreamESP32 |
| Audio output to PWM pins for the ESP32. The ESP32 supports up to 16 channels. More... | |
| class | PWMAudioStreamMBED |
| Audio output to PWM pins for MBED based Arduino implementations. More... | |
| class | PWMAudioStreamPico |
| Audio output for the Rasperry Pico to PWM pins. The Raspberry Pi Pico has 8 PWM blocks/slices(1-8) and each PWM block provides up to two PWM outputs(A-B). More... | |
| struct | PWMConfig |
| Configuration data for PWM audio output. More... | |
| class | PWMDAC |
| Audio Output with PWM signal. More... | |
| class | RingBuffer |
| Implements a typed Ringbuffer. More... | |
| class | RingBufferStream |
| A Stream backed by a Ringbuffer. We can write to the end and read from the beginning of the stream. More... | |
| class | SerialDAC |
| A SimpleDAC which uses the Serial UART to output values. This implementation is not using any timers and therefore should work on any microcontroller. More... | |
| class | SilenceGenerator |
| Provides 0 as sound data. This can be used e.g. to test the output functionality which should optimally just output silence and no artifacts. More... | |
| class | SimpleDAC |
| Software Implementation of a Simple DAC - We quantize a digital int16_t sample my mapping the value to the range of 0b0 to info.output_bits number of 1, where the intensity is represented by the number of ones. This is very similar to PWM! More... | |
| class | SineWaveGenerator |
| Generates a Sound with the help of sin() function. More... | |
| class | SingleBuffer |
| A simple Buffer implementation which just uses a (dynamically sized) array. More... | |
| class | SoundGenerator |
| Base class to define the abstract interface for the sound generating classes. More... | |
| class | SquareWaveGenerator |
| Generates a square wave sound. More... | |
| class | STKStream |
| Stream Source which provides the audio data using the STK framework: https://github.com/pschatzmann/Arduino-STK. More... | |
| class | Str |
| A simple wrapper to provide string functions on char*. If the underlying char* is a const we do not allow any updates; The ownership of the chr* must be managed externally! More... | |
| class | StreamCopy |
| We provide the typeless StreamCopy as a subclass of StreamCopyT. More... | |
| class | StreamCopyT |
| Typed Stream Copy which supports the conversion from channel to 2 channels. We make sure that we allways copy full samples. More... | |
| class | StrExt |
| Str which keeps the data on the heap. We grow the allocated memory only if the copy source is not fitting. More... | |
| class | TimerAlarmRepeatingDef |
| Common Interface definition for TimerAlarmRepeating. More... | |
| class | TimerAlarmRepeatingESP32 |
| Repeating Timer functions for simple scheduling of repeated execution. The basic logic is taken from https://www.toptal.com/embedded/esp32-audio-sampling. Plaease use the typedef TimerAlarmRepeating. More... | |
| class | TimerAlarmRepeatingESP8266 |
| Repeating Timer functions for repeated execution: Plaease use the typedef TimerAlarmRepeating. More... | |
| class | TimerAlarmRepeatingMBED |
| Repeating Timer functions for repeated execution: Plaease use the typedef TimerAlarmRepeating. More... | |
| class | TimerAlarmRepeatingRP2040 |
| Repeating Timer functions for repeated execution: Plaease use the typedef TimerAlarmRepeating. More... | |
| class | TimerAlarmRepeatingSTM32 |
| STM32 Repeating Timer functions for repeated execution: Plaease use the typedef TimerAlarmRepeating. More... | |
| class | TimerCallback |
| Internal class to manage the different timer callbacks for the 4 hardware timers. More... | |
| class | Url |
| URL parser which breaks a full url string up into its individual parts. More... | |
| class | URLStream |
| Represents the content of a URL as Stream. We use the WiFi.h API. More... | |
| class | UserCallback |
| Internal class to manage User callbacks. An optinal parameter can be passed to the callback method. More... | |
| class | Vector |
| Vector implementation which provides the most important methods as defined by std::vector. This class it is quite handy to have and most of the times quite better then dealing with raw c arrays. More... | |
| class | VolumeOutput |
| Output PWM object on which we can apply some volume settings. More... | |
| struct | WAVAudioInfo |
| Sound information which is available in the WAV header. More... | |
| class | WAVDecoder |
| WAVDecoder - We parse the header data on the first record and send the sound data to the stream which was indicated in the constructor. Only WAV files with WAV_FORMAT_PCM are supported! More... | |
| class | WAVEncoder |
| A simple WAV file encoder. More... | |
| class | WAVHeader |
| Parser for Wav header data for details see https://de.wikipedia.org/wiki/RIFF_WAVE. More... | |
Typedefs | |
| typedef int16_t | arrayOf2int16_t[2] |
| typedef sdfat::FsFile | AudioFile |
| typedef sdfat::SdFs | AudioFs |
| typedef void(* | AudioServerDataCallback) (Stream &out) |
| Calback which writes the sound data to the stream. | |
| typedef PortAudioStream | DefaultStream |
| typedef void(* | my_repeating_timer_callback_t) (void *obj) |
| typedef PinInfoESP32 | PinInfo |
| typedef PWMAudioStreamAVR | PWMAudioStream |
| typedef bool(* | PWMCallbackType) (uint8_t channels, int16_t *data) |
| typedef void(* | repeating_timer_callback_t) (void *obj) |
| typedef sdfat::SdSpiConfig | SdSpiConfig |
| typedef void(* | simple_callback) (void) |
| typedef TimerAlarmRepeatingESP32 | TimerAlarmRepeating |
Enumerations | |
| enum | FillLeftAndRightStatus { Auto , LeftIsEmpty , RightIsEmpty } |
| enum | I2SMode { I2S_STD_MODE , I2S_LSB_MODE , I2S_MSB_MODE , I2S_PHILIPS_MODE , I2S_RIGHT_JUSTIFIED_MODE , I2S_LEFT_JUSTIFIED_MODE } |
| enum | MetaDataType { Title , Artist , Album , Genre } |
| Type of meta info. | |
| enum | ParseStatus { TagNotFound , PartialTagAtTail , TagFoundPartial , TagFoundComplete , TagProcessed } |
| current status of the parsing | |
| enum | RxTxMode { TX_MODE , RX_MODE } |
| enum | TimeUnit { MS , US } |
| Time Units. | |
Functions | |
| RingBuffer< uint8_t > | a2dp_buffer (A2DP_BUFFER_SIZE *A2DP_BUFFER_COUNT) |
| void | a2dp_stream_sink_sound_data (const uint8_t *data, uint32_t len) |
| int32_t | a2dp_stream_source_sound_data (Frame *data, int32_t len) |
| static int16_t | convert16 (int value, int value_bits_per_sample) |
| static int16_t | convert8 (int value, int value_bits_per_sample) |
| static int16_t | convert8DAC (int value, int value_bits_per_sample) |
| static int16_t | convertFrom24To16 (int24_t value) |
| static int32_t | convertFrom24To32 (int24_t value) |
| static float | convertFrom24ToFloat (int24_t value) |
| static int16_t | convertFrom32To16 (int32_t value) |
| void | defaultPWMAudioOutputCallback () |
| separate method that can be defined as friend so that we can access protected information More... | |
| bool | defaultPWMAudioOutputCallbackPico (repeating_timer *ptr) |
| NBuffer< uint8_t > | i2s_buffer (i2s_buffer_size, 5) |
| void | I2S_IRQHandler (void) |
| ISR (TIMER1_COMPA_vect) | |
| timer callback: write the next frame to the pins | |
| static int64_t | maxValue (int value_bits_per_sample) |
| void | stop () |
| stops any further processing by spinning in an endless loop | |
Variables | |
| const char * | ACCEPT = "Accept" |
| const char * | ACCEPT_ALL = "*/*" |
| const char * | ACCEPT_ENCODING = "Accept-Encoding" |
| static PWMAudioStreamAVR * | accessAudioPWM = nullptr |
| static PWMAudioStreamESP32 * | accessAudioPWM = nullptr |
| static PWMAudioStreamMBED * | accessAudioPWM = nullptr |
| const char * | ADC_TAG = "ADC" |
| AudioBaseInfoDependent * | audioChangeAACHelix =nullptr |
| AudioBaseInfoDependent * | audioChangeFDK = nullptr |
| AudioBaseInfoDependent * | audioChangeMAD |
| AudioBaseInfoDependent * | audioChangeMP3Helix =nullptr |
| const char * | CHUNKED = "chunked" |
| const char * | CON_CLOSE = "close" |
| const char * | CON_KEEP_ALIVE = "keep-alive" |
| const char * | CONNECTION = "Connection" |
| const char * | CONTENT_LENGTH = "Content-Length" |
| const char * | CONTENT_TYPE = "Content-Type" |
| const char * | DEFAULT_AGENT = "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" |
| audio_tools::PWMConfig | default_config |
| const Nano_BLE_freq_info | freq_table [] |
| const char * | genres [] = { "Classic Rock", "Country", "Dance", "Disco", "Funk", "Grunge", "Hip-Hop", "Jazz", "Metal", "New Age", "Oldies", "Other", "Pop", "R&B", "Rap", "Reggae", "Rock", "Techno", "Industrial", "Alternative", "Ska", "Death Metal", "Pranks", "Soundtrack", "Euro-Techno", "Ambient", "Trip-Hop", "Vocal", "Jazz+Funk", "Fusion", "Trance", "Classical", "Instrumental", "Acid", "House", "Game", "Sound Clip", "Gospel", "Noise", "Alternative Rock", "Bass", "Soul", "Punk", "Space", "Meditative", "Instrumental Pop", "Instrumental Rock", "Ethnic", "Gothic", "Darkwave", "Techno-Insdustiral", "Electronic", "Pop-Folk", "Eurodance", "Dream", "Southern Rock", "Comedy", "Cult", "Gangsta", "Top 40", "Christian Rap", "Pop/Funk", "Jungle", "Native US", "Cabaret", "New Wave", "Psychadelic", "Rave", "Showtunes", "Trailer", "Lo-Fi", "Tribal", "Acid Punk", "Acid Jazz", "Polka", "Retro", "Musical", "Rock & Roll", "Hard Rock", "Folk", "Folk-Rock", "National Folk", "Swing", "Fast Fusion", "Bebob", "Latin", "Revival", "Celtic", "Bluegrass", "Avantgarde", "Gothic Rock", "Progressive Rock", "Psychedelic Rock", "Symphonic Rock", "Slow Rock", "Big Band", "Chorus", "Easy Listening", "Acoustic","Humour", "Speech", "Chanson", "Opera", "Chamber Music", "Sonata", "Symphony", "Booty Bass", "Primus", "Porn Groove", "Satire", "Slow Jam", "Club", "Tango", "Samba", "Folklore", "Ballad", "Power Ballad", "Rhytmic Soul", "Freestyle", "Duet", "Punk Rock", "Drum Solo", "Acapella", "Euro-House", "Dance Hall", "Goa", "Drum & Bass", "Club-House", "Hardcore", "Terror", "Indie", "BritPop", "Negerpunk", "Polsk Punk", "Beat", "Christian Gangsta", "Heavy Metal", "Black Metal", "Crossover", "Contemporary C", "Christian Rock", "Merengue", "Salsa", "Thrash Metal", "Anime", "JPop", "SynthPop" } |
| String array with genres. | |
| const char * | HOST_C = "Host" |
| const int | i2s_buffer_size = 1024 |
| const char * | id3_v2_tags [] = {"TALB", "TOPE", "TIT2", "TCON"} |
| Relevant v2 Tags | |
| const int | ID3FrameSize = 11 |
| const char * | IDENTITY = "identity" |
| volatile bool | is_a2dp_active = false |
| const char * | LOCATION = "Location" |
| const int | MaxHeaderLineLength = 200 |
| const char * | MetaDataTypeStr [] = {"Title", "Artis", "Album", "Genre"} |
| Test Description for meta info. | |
| const char * | methods [] = {"?","GET","HEAD","POST","PUT","DELETE","TRACE","OPTIONS","CONNECT","PATCH",nullptr} |
| static portMUX_TYPE | mutex_logger = portMUX_INITIALIZER_UNLOCKED |
| volatile uint32_t | output_frame_count = 0 |
| const Nano_BLE_ratio_info | ratio_table [] |
| TimerAlarmRepeatingESP8266 * | self |
| class audio_tools::UserCallback * | simpleUserCallback = nullptr |
| const char * | SUCCESS = "Success" |
| TimerAlarmRepeatingMBED * | timerAlarmRepeating = nullptr |
| class audio_tools::TimerCallback * | timerCallbackArray = nullptr |
| const char * | TRANSFER_ENCODING = "Transfer-Encoding" |
| const char * | UNDERFLOW = "data underflow" |
| const char * | USER_AGENT = "User-Agent" |
| const char * | wav_mime = "audio/wav" |
Parser for MP3 ID3 Meta Data: The goal is to implement a simple API which provides the title, artist, albmum and the Genre.
typedefs for Default
Generic Implementation of sound input and output for desktop environments using portaudio.
| void audio_tools::defaultPWMAudioOutputCallback | ( | ) |
separate method that can be defined as friend so that we can access protected information
timer callback: write the next frame to the pins
| void audio_tools::I2S_IRQHandler | ( | void | ) |
I2S Event handler
| const Nano_BLE_freq_info audio_tools::freq_table[] |
| const Nano_BLE_ratio_info audio_tools::ratio_table[] |
1.9.1