mehmetcanbudak/teensy-variable-playback

variable playback rate for teensy audio library

variable rate playback for teensy audio library

A set of classes to read and play 16-bit raw mono audio from micro sd-card at variable forward and backward playback rates on teensy

• for best performance, use SDXC UHS 30MB/sec Application Performance Class 2 (A2) class micro sd-card.
  • sd classes on wikipedia

todo

• improve looping controls, allow xm-tracker like sample looping,
  • loop start and finish markers, ping ponging, repeating, etc.
• stereo

requirements

• x86 / x64 linux unit tests

  • cmake
  • gcc or llvm: c++ standard library (using std::vector, std::function)
  • boost unit-test library: sudo apt-get install -yq libboost-test-dev

• teensy variable playback library

  • cmake
  • gcc-arm-none-eabi: for cross-compiling to arm cortex m7 architecture (for teensy 4.0)
  • github
    • newdigate
      • teensy-cmake-macros

      > git clone https://github.com/newdigate/teensy-cmake-macros.git
      > cd teensy-cmake-macros
      > mkdir cmake-build-debug
      > cd cmake-build-debug
      > cmake ..
      > sudo make install        

    • PaulStoffregen
      • cores.git
      • Audio.git
      • SD.git @ Juse_Use_SdFat
      • Wire.git
      • SPI.git
      • SerialFlash.git
      • arm_math.git
    • greiman
      • SdFat.git

graph G {
  graph[rankdir="LR"]
  "teensy variable playback" -- "teensy-cmake-macros" -- "cmake" [label="dev"]
  "teensy-cmake-macros" -- "arm-none-eabi-gcc"  [label="dev"]
  "PaulStoffregen/Audio.git" -- "PaulStoffregen/cores.git"
  "teensy variable playback" -- "PaulStoffregen/Audio.git"
  "PaulStoffregen/Audio.git" -- "PaulStoffregen/SD.git@Juse_Use_SdFat"
  "PaulStoffregen/SD.git@Juse_Use_SdFat" -- "PaulStoffregen/SPI.git"
  "PaulStoffregen/SD.git@Juse_Use_SdFat" -- "greiman/SdFat.git"
  "PaulStoffregen/Audio.git" -- "PaulStoffregen/Wire.git"
  "PaulStoffregen/Audio.git" -- "PaulStoffregen/SerialFlash.git"
  "PaulStoffregen/Audio.git" -- "PaulStoffregen/arm_math.git"
}

code structure

folder	target	description
examples	teensy	basic example how to use
src	teensy / test	extends teensy audio library * adds AudioPlaySdRawResmp * play raw audio at variable forward and backward playback rates
test	test	unit tests that run on linux x64 or x86 architecture, tests certain non-audio code in src folder

build and run/debug tests locally on pc

clone repo

> git clone https://github.com/newdigate/teensy-variable-playback.git
> cd teensy-variable-playback

• manual configuration steps required:
  • if you just want to compile, and run/debug the tests, you can comment out the audio subdirectory in the root CMakeLists.txt
    • add_subdirectory(audio) -> #add_subdirectory(audio)
  • update examples/CMakeLists.cmake.in:
    • set cmake path variables to point to your arm gcc toolchain, teensy cores, and library dependencies

set(COMPILERPATH "/Users/xxx/gcc-arm-none-eabi-7-2017-q4-major/bin/")
set(DEPSPATH "/Applications/Teensyduino.app/Contents/Java/hardware/teensy/avr/libraries")
set(COREPATH "/Applications/Teensyduino.app/Contents/Java/hardware/teensy/avr/cores/teensy4/")

build tests on linux

> ./build

build tests on win

> mkdir cmake-build-debug
> cd cmake-build-debug
> cmake -DCMAKE_BUILD_TYPE=Debug
> make

run tests

> cmake-build-debug/test/test_suite1

visual studio code

• download vs code
  • install plug-in ms-vscode.cpptools
• open root folder of repository in visual studio code
• open terminal in visual studio code build, build as above
• (add breakpoint)
• launch