:mod:`synthio`
==============

.. py:module:: synthio

.. autoapi-nested-parse::

   Support for MIDI synthesis



.. raw:: html

    <p>
    <details>
    <summary>Available on these boards</summary>
    <ul>
    <li> AITHinker ESP32-C3S_Kit
    <li> ARAMCON Badge 2019
    <li> ARAMCON2 Badge
    <li> ATMegaZero ESP32-S2
    <li> Adafruit CLUE nRF52840 Express
    <li> Adafruit Circuit Playground Bluefruit
    <li> Adafruit EdgeBadge
    <li> Adafruit Feather Bluefruit Sense
    <li> Adafruit Feather ESP32-S2 TFT
    <li> Adafruit Feather ESP32S2
    <li> Adafruit Feather M4 CAN
    <li> Adafruit Feather M4 Express
    <li> Adafruit Feather RP2040
    <li> Adafruit Feather STM32F405 Express
    <li> Adafruit Feather nRF52840 Express
    <li> Adafruit FunHouse
    <li> Adafruit Grand Central M4 Express
    <li> Adafruit Hallowing M4 Express
    <li> Adafruit ItsyBitsy M4 Express
    <li> Adafruit ItsyBitsy RP2040
    <li> Adafruit ItsyBitsy nRF52840 Express
    <li> Adafruit KB2040
    <li> Adafruit LED Glasses Driver nRF52840
    <li> Adafruit Macropad RP2040
    <li> Adafruit MagTag
    <li> Adafruit Matrix Portal M4
    <li> Adafruit Metro ESP32S2
    <li> Adafruit Metro M4 Airlift Lite
    <li> Adafruit Metro M4 Express
    <li> Adafruit Metro nRF52840 Express
    <li> Adafruit Monster M4SK
    <li> Adafruit PyGamer
    <li> Adafruit PyPortal
    <li> Adafruit PyPortal Pynt
    <li> Adafruit PyPortal Titano
    <li> Adafruit Pybadge
    <li> Adafruit QT Py ESP32S2
    <li> Adafruit QT Py RP2040
    <li> Adafruit QT2040 Trinkey
    <li> Adafruit Trellis M4 Express
    <li> AloriumTech Evo M51
    <li> Arduino Nano 33 BLE
    <li> Arduino Nano RP2040 Connect
    <li> Artisense Reference Design RD00
    <li> AtelierDuMaker nRF52840 Breakout
    <li> BDMICRO VINA-D51
    <li> BLE-SS dev board Multi Sensor
    <li> BastBLE
    <li> BastWiFi
    <li> BlueMicro840
    <li> CP32-M4
    <li> Capable Robot Programmable USB Hub
    <li> Challenger NB RP2040 WiFi
    <li> Challenger RP2040 LTE
    <li> Challenger RP2040 WiFi
    <li> CircuitBrains Deluxe
    <li> CrumpS2
    <li> Cytron Maker Nano RP2040
    <li> Cytron Maker Pi RP2040
    <li> DynOSSAT-EDU-OBC
    <li> ESP 12k NodeMCU
    <li> Electronut Labs Blip
    <li> Electronut Labs Papyr
    <li> EncoderPad RP2040
    <li> Feather ESP32S2 without PSRAM
    <li> FeatherS2
    <li> FeatherS2 Neo
    <li> FeatherS2 PreRelease
    <li> Franzininho WIFI w/Wroom
    <li> Franzininho WIFI w/Wrover
    <li> Gravitech Cucumber M
    <li> Gravitech Cucumber MS
    <li> Gravitech Cucumber R
    <li> Gravitech Cucumber RS
    <li> HMI-DevKit-1.1
    <li> HiiBot BlueFi
    <li> IkigaiSense Vita nRF52840
    <li> Kaluga 1
    <li> LILYGO TTGO T8 ESP32-S2 w/Display
    <li> MDBT50Q-DB-40
    <li> MDBT50Q-RX Dongle
    <li> MEOWBIT
    <li> MORPHEANS MorphESP-240
    <li> MakerDiary nRF52840 MDK
    <li> MakerDiary nRF52840 MDK USB Dongle
    <li> Makerdiary M60 Keyboard
    <li> Makerdiary Pitaya Go
    <li> Makerdiary nRF52840 M.2 Developer Kit
    <li> Melopero Shake RP2040
    <li> MicroDev microC3
    <li> MicroDev microS2
    <li> Mini SAM M4
    <li> Oak Dev Tech BREAD2040
    <li> Oak Dev Tech PixelWing ESP32S2
    <li> Open Hardware Summit 2020 Badge
    <li> PCA10056 nRF52840-DK
    <li> PCA10059 nRF52840 Dongle
    <li> Particle Argon
    <li> Particle Boron
    <li> Particle Xenon
    <li> PewPew M4
    <li> Pimoroni Interstate 75
    <li> Pimoroni Keybow 2040
    <li> Pimoroni PGA2040
    <li> Pimoroni Pico LiPo (16MB)
    <li> Pimoroni Pico LiPo (4MB)
    <li> Pimoroni PicoSystem
    <li> Pimoroni Plasma 2040
    <li> Pimoroni Tiny 2040
    <li> PyCubedv04
    <li> PyCubedv04-MRAM
    <li> PyCubedv05
    <li> PyCubedv05-MRAM
    <li> PyKey60
    <li> PyboardV1_1
    <li> RP2040 Stamp
    <li> Raspberry Pi Pico
    <li> Robo HAT MM1 M4
    <li> S2Mini
    <li> S2Pico
    <li> SAM E54 Xplained Pro
    <li> SAM32v26
    <li> STM32F412G_DISCO
    <li> STM32F4_DISCO
    <li> Saola 1 w/Wroom
    <li> Saola 1 w/Wrover
    <li> Seeeduino Wio Terminal
    <li> Silicognition LLC M4-Shim
    <li> SparkFun MicroMod RP2040 Processor
    <li> SparkFun MicroMod SAMD51 Processor
    <li> SparkFun MicroMod nRF52840 Processor
    <li> SparkFun Pro Micro RP2040
    <li> SparkFun Pro nRF52840 Mini
    <li> SparkFun STM32 MicroMod Processor
    <li> SparkFun Thing Plus - RP2040
    <li> SparkFun Thing Plus - SAMD51
    <li> Swan R5
    <li> TG-Boards' Datalore IP M4
    <li> TG-Watch
    <li> THUNDERPACK_v11
    <li> THUNDERPACK_v12
    <li> Targett Module Clip w/Wroom
    <li> Targett Module Clip w/Wrover
    <li> Teknikio Bluebird
    <li> The Open Book Feather
    <li> Thingz - Galaxia
    <li> TinkeringTech ScoutMakes Azul
    <li> TinyS2
    <li> UARTLogger II
    <li> WarmBit BluePixel nRF52840
    <li> micro:bit v2
    <li> nanoESP32-S2  w/Wrover
    <li> nanoESP32-S2 w/Wroom
    <li> nice!nano
    <li> stm32f411ce-blackpill-with-flash
    </ul>
    </details>
    </p>




.. py:function:: from_file(file: BinaryIO, *, sample_rate: int = 11025) -> MidiTrack

   Create an AudioSample from an already opened MIDI file.
   Currently, only single-track MIDI (type 0) is supported.

   :param typing.BinaryIO file: Already opened MIDI file
   :param int sample_rate: The desired playback sample rate; higher sample rate requires more memory


   Playing a MIDI file from flash::

         import audioio
         import board
         import synthio

         data = open("single-track.midi", "rb")
         midi = synthio.from_file(data)
         a = audioio.AudioOut(board.A0)

         print("playing")
         a.play(midi)
         while a.playing:
           pass
         print("stopped")


.. py:class:: MidiTrack(buffer: _typing.ReadableBuffer, tempo: int, *, sample_rate: int = 11025)

   Simple square-wave MIDI synth

   Create a MidiTrack from the given stream of MIDI events. Only "Note On" and "Note Off" events
   are supported; channel numbers and key velocities are ignored. Up to two notes may be on at the
   same time.

   :param ~_typing.ReadableBuffer buffer: Stream of MIDI events, as stored in a MIDI file track chunk
   :param int tempo: Tempo of the streamed events, in MIDI ticks per second
   :param int sample_rate: The desired playback sample rate; higher sample rate requires more memory

   Simple melody::

     import audioio
     import board
     import synthio

     dac = audioio.AudioOut(board.SPEAKER)
     melody = synthio.MidiTrack(b"\0\x90H\0*\x80H\0\6\x90J\0*\x80J\0\6\x90L\0*\x80L\0\6\x90J\0" +
                                b"*\x80J\0\6\x90H\0*\x80H\0\6\x90J\0*\x80J\0\6\x90L\0T\x80L\0" +
                                b"\x0c\x90H\0T\x80H\0\x0c\x90H\0T\x80H\0", tempo=640)
     dac.play(melody)
     print("playing")
     while dac.playing:
       pass
     print("stopped")

   .. py:attribute:: sample_rate
      :annotation: :Optional[int]

      32 bit value that tells how quickly samples are played in Hertz (cycles per second).


   .. py:method:: deinit() -> None

      Deinitialises the MidiTrack and releases any hardware resources for reuse.


   .. py:method:: __enter__() -> MidiTrack

      No-op used by Context Managers.


   .. py:method:: __exit__() -> None

      Automatically deinitializes the hardware when exiting a context. See
      :ref:`lifetime-and-contextmanagers` for more info.