Codecs

Audio Coder and Decoder
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Modules
	Decoder
	Audio Decoder.
	Encoder
	Audio Encoder.

Classes
class	AACDecoderFAAD
	AAC Decoder using faad: https://github.com/pschatzmann/arduino-libfaad This needs a stack of around 60000 and you need to make sure that memory is allocated on PSRAM. See https://www.pschatzmann.ch/home/2023/09/12/arduino-audio-tools-faat-aac-decoder/. 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 AudioInfo and provides the handlig of AudioInfo changes. More...
class	AACDecoderHelix
	AAC Decoder using libhelix: https://github.com/pschatzmann/arduino-libhelix This is basically just a simple wrapper to provide AudioInfo and AudioInfoSupport. 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	ADPCMDecoder
	Decoder for ADPCM. Depends on https://github.com/pschatzmann/adpcm. More...
class	ADPCMDecoderXQ
	Decoder for ADPCM-XQ. Depends on https://github.com/pschatzmann/arduino-adpcm-xq. More...
class	ADPCMEncoder
	Encoder for ADPCM - Depends on https://github.com/pschatzmann/adpcm. More...
class	ADPCMEncoderXQ
	Encoder for ADPCM-XQ - Depends on https://github.com/pschatzmann/arduino-adpcm-xq. More...
class	ADTSDecoder
	Audio Data Transport Stream (ADTS) is a format similar to Audio Data Interchange Format (ADIF), used by MPEG TS or Shoutcast to stream audio defined in MPEG-2 Part 7, usually AAC. This parser extracts all valid ADTS frames from the data stream ignoring other data. More...
class	APTXDecoder
	Decoder for OpenAptx. Depends on https://github.com/pschatzmann/libopenaptx. More...
class	APTXEncoder
	Encoder for OpenAptx - Depends on https://github.com/pschatzmann/libopenaptx. More...
class	AudioDecoder
	Docoding of encoded audio into PCM data. More...
class	AudioEncoder
	Encoding of PCM data. More...
class	AVIDecoder
	AVI Container Decoder which can be fed with small chunks of data. The minimum length must be bigger then the header size! The file structure is documented at https://learn.microsoft.com/en-us/windows/win32/directshow/avi-riff-file-reference. More...
class	BinaryContainerDecoder
	Decodes the provided data from the DAT and CFG segments. More...
class	BinaryContainerEncoder
	Wraps the encoded data into Config, Data, and Meta segments so that we can recover the audio configuration and orignial segments if this is relevant. We assume that a full segment is written with each call of write(); The segments are separated with a new line character. More...
class	Codec2Decoder
	Decoder for Codec2. Depends on https://github.com/pschatzmann/arduino-libcodec2. More...
class	Codec2Encoder
	Encoder for Codec2 - Depends on https://github.com/pschatzmann/arduino-libcodec2. More...
class	CodecNOP
	Dummy 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	ContainerDecoder
	Parent class for all container formats. More...
class	ContainerMP4
	Minimum flexible parser for MPEG4 data (which is based on the Quicktime format). Small atoms will be make available via a callback method. The big (audio) content is written to the Print object which was specified in the constructor. Depends on https://github.com/pschatzmann/arduino-libhelix! More...
class	CopyDecoder
	Dummy Decoder which just copies the provided data to the output. More...
class	CopyEncoder
	Dummy Encoder which just copies the provided data to the output. More...
class	DecoderAdapter
	Adapter class which allows the AudioDecoder API on a StreamingDecoder. More...
class	DecoderBase64
	DecoderBase64 - Converts a Base64 encoded Stream into the original data stream. Decoding only gives a valid result if we start at a limit of 4 bytes. We therefore use by default a newline to determine a valid start boundary. More...
class	DecoderBasic
	DecoderBasic - supports mime type audio/basic Requires https://github.com/pschatzmann/arduino-libg7xx The content of the "audio/basic" subtype is single channel audio encoded using 8bit ISDN mu-law [PCM] at a sample rate of 8000 Hz. More...
class	DecoderFloat
	DecoderFloat - Converts Stream of floats into 2 byte integers. More...
class	DecoderHelix
	MP3 and AAC Decoder using libhelix: https://github.com/pschatzmann/arduino-libhelix. We dynamically create a MP3 or AAC decoder dependent on the provided audio format. More...
class	DecoderL16
	DecoderL16 - Converts an 16 Bit Stream into 16Bits network byte order. More...
class	DecoderL8
	DecoderL8 - Converts an 8 Bit Stream into 16Bits Most microcontrollers can not output 8 bit data directly. 8 bit data however is very memory efficient and helps if you need to store audio on constrained resources. This decoder translates 8bit data into 16bit data. By default the encoded data is represented as uint8_t, so the values are from 0 to 255. More...
class	EncoderBase64
	EncoderBase64s - Encodes the input data into a Base64 string. By default each audio frame is followed by a new line, so that we can easily resynchronize the reading of a data stream. The generation of the new line can be configured with the setNewLine() method. More...
class	EncoderBasic
	EncoderBasic - supports mime type audio/basic. The content of the "audio/basic" subtype is single channel audio encoded using 8bit ISDN mu-law [PCM] at a sample rate of 8000 Hz. Requires https://github.com/pschatzmann/arduino-libg7xx. More...
class	EncoderFloat
	EncoderFloats - Encodes 16 bit PCM data stream to floats data. More...
class	EncoderL16
	EncoderL16s - Condenses 16 bit PCM data stream to 8 bits data. Most microcontrollers can not process 8 bit audio data directly. 8 bit data however is very memory efficient and helps if you need to store audio on constrained resources. This encoder translates 16bit data into 8bit data. More...
class	EncoderL8
	EncoderL8s - Condenses 16 bit PCM data stream to 8 bits data. Most microcontrollers can not process 8 bit audio data directly. 8 bit data however is very memory efficient and helps if you need to store audio on constrained resources. This encoder translates 16bit data into 8bit data. By default the encoded data is represented as uint8_t, so the values are from 0 to 255. More...
class	FLACDecoder
	Decoder for FLAC. Depends on https://github.com/pschatzmann/arduino-libflac. We support an efficient streaming API and an very memory intensitiv standard interface. So you should prefer the streaming interface where you call setOutput() before the begin and copy() in the loop. Validated with http://www.2l.no/hires/. More...
class	FLACEncoder
	FLACEncoder. More...
class	G711_ALAWDecoder
	64 kbit/s g711 ALOW Decoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G711_ALAWEncoder
	64 kbit/s g711 ALOW Encoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G711_ULAWDecoder
	64 kbit/s g711 ULOW Decoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G711_ULAWEncoder
	64 kbit/s g711 ULOW Encoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G711Decoder
	64 kbit/s g711 ULOW Decoder based on https://github.com/pschatzmann/arduino-libg7xx Supported decoder parameters: alaw2linear, ulaw2linear More...
class	G711Encoder
	64 kbit/s g711 ULOW Encoder based on https://github.com/pschatzmann/arduino-libg7xx Supported encoder parameters: linear2alaw2, linear2ulaw More...
class	G721Decoder
	32Kbps G721 Decoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G721Encoder
	32Kbps G721 Encoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G722Decoder
	Decoder for G.722. Depends on https://github.com/pschatzmann/arduino-libg722. More...
class	G722Encoder
	Encoder for G.722 - Depends on https://github.com/pschatzmann/arduino-libg722. Inspired by g722enc.c. More...
class	G723_24Decoder
	24Kbps G723 Decoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G723_24Encoder
	24Kbps G723 Encoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G723_40Decoder
	40Kbps G723 Decoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G723_40Encoder
	40Kbps G723 Encoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G7xxDecoder
	g723_24, g721, g723_40 Decoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	G7xxEncoder
	g723_24, g721, g723_40 Encoder based on https://github.com/pschatzmann/arduino-libg7xx More...
class	GSMDecoder
	Decoder for GSM. Depends on https://github.com/pschatzmann/arduino-libgsm. Inspired by gsmdec.c. More...
class	GSMEncoder
	Encoder for GSM - Depends on https://github.com/pschatzmann/arduino-libgsm. Inspired by gsmenc.c. More...
class	ILBCDecoder
	Decoder for iLBC. Depends on https://github.com/pschatzmann/libilbc. More...
class	ILBCEncoder
	Encoder for iLBC - Depends on https://github.com/pschatzmann/libopenilbc. More...
class	LC3Decoder
	Decoder for LC3. Depends on https://github.com/pschatzmann/arduino-liblc3. More...
class	LC3Encoder
	Encoder for LC3 - Depends on https://github.com/pschatzmann/arduino-liblc3. More...
class	MP3DecoderHelix
	MP3 Decoder using libhelix: https://github.com/pschatzmann/arduino-libhelix This is basically just a simple wrapper to provide AudioInfo and AudioInfoSupport. More...
class	MP3DecoderMAD
	MP3 Decoder using https://github.com/pschatzmann/arduino-libmad. More...
class	MP3DecoderMini
	MP3 Decoder using https://github.com/pschatzmann/minimp3. This decoder does not provide any good results and it is not suited to decode any audio above 32000 on an ESP32. So the sample rate is limited by the MINIMP3_MAX_SAMPLE_RATE variable. 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	MTSDecoder
	MPEG-TS (MTS) decoder. Extracts the AAC audio data from a MPEG-TS (MTS) data stream. You can define the relevant stream types via the API. The parsing logic was taken from: https://github.com/Yokohama-Miyazawa/M5HLSPlayer/blob/main/src/AudioGeneratorTS.cpp Status: experimental! More...
class	OggContainerDecoder
	Decoder for Ogg Container. Decodes a packet from an Ogg container. The Ogg begin segment contains the AudioInfo structure. You can subclass and overwrite the beginOfSegment() method to implement your own headers Dependency: https://github.com/pschatzmann/arduino-libopus. More...
class	OggContainerEncoder
	Encoder for Ogg Container. Encodes a packet for an Ogg container. The Ogg begin segment contains the AudioInfo structure. You can subclass ond overwrite the writeHeader() method to implement your own header logic. When an optional encoder is specified in the constructor we package the encoded data. Dependency: https://github.com/pschatzmann/arduino-libopus. More...
class	OpusAudioDecoder
	OpusAudioDecoder: Depends on https://github.com/pschatzmann/arduino-libopus.git. More...
class	OpusAudioEncoder
	OpusAudioEncoder: Dependens on https://github.com/pschatzmann/arduino-libopus.git. More...
class	OpusOggDecoder
	Opus Decoder which uses the Ogg Container. See https://datatracker.ietf.org/doc/html/rfc7845. The audio data is transmitted in frames and the header information contains the sampler rate, channels and other critical info. Dependency: https://github.com/pschatzmann/arduino-libopus. More...
class	OpusOggEncoder
	Opus Encoder which uses the Ogg Container: see https://datatracker.ietf.org/doc/html/rfc7845 Dependency: https://github.com/pschatzmann/arduino-libopus. More...
class	SBCDecoder
	Decoder for SBC. Depends on https://github.com/pschatzmann/arduino-libsbc. Inspired by sbcdec.c. More...
class	SBCEncoder
	Encoder for SBC - Depends on https://github.com/pschatzmann/arduino-libsbc. Inspired by sbcenc.c. More...
class	StreamingDecoder
	A Streaming Decoder where we provide both the input and output as streams. More...
class	StreamingDecoderAdapter
	Converts any AudioDecoder to a StreamingDecoder. More...
class	VorbisDecoder
	Vorbis Streaming Decoder using https://github.com/pschatzmann/arduino-libvorbis-tremor. More...
class	WAVDecoder
	A simple WAVDecoder: We parse the header data on the first record to determine the format. If no AudioDecoderExt is specified we just write the PCM data to the output that is defined by calling setOutput(). You can define a ADPCM decoder to decode WAV files that contain ADPCM data. More...
class	WAVEncoder
	A simple WAV file encoder. If no AudioEncoderExt is specified the WAV file contains PCM data, otherwise it is encoded as ADPCM. The WAV header is written with the first writing of audio data. Calling begin() is making sure that the header is written again. More...
class	WavIMADecoder
	Obsolete: WavIMADecoder - based on WAVDecoder - We parse the header data as we receive it and send the sound data to the stream which was indicated in the constructor. Only WAV files with WAVE_FORMAT_IMA_ADPCM are supported by this codec! More...

Detailed Description

Audio Coder and Decoder