Autosampler

Autosampler is a command line app that can create multisamples of hardware MIDI devices. It opens a MIDI port to send notes and an Audio input to record audio data.

Audio data is automatically cut & trimmed and written to folders according to the filename scheme as specified on the command line (see below).

Dependencies

portaudio - for audio input

portmidi - for MIDI output

Both of them are included in the repository and are built with the main project.

cmake - build system

Building

Build system used is cmake. Example to compile on Windows:

cd source/
cmake . -B ../temp/ -G "Visual Studio 15 2017 Win64"
cd ../temp/
cmake --build . --config Release

Usage:

All arguments need to be specified in form -arg value. The following parameters are supported:

ai-device             Specify the audio device to be used to capture data. Can be
                      empty in which case the default device is used
                      Example: Windows DirectSound

ai-api                Specify the audio host API to be used. Can be empty in which
                      case the default api is used.
                      Example: Input (High Definition Audio Device)

ai-bitrate            Specify the bit depth at which audio is recorded.
                      Default: 24
                      Examples: 16 / 24 / 32

ai-samplerate         Specify the sample rate at which audio is recorded.
                      Default: 48000
                      Examples: 44100 / 48000 / 96000

ai-channels           Specify the number of input channels that are recorded. Default
                      mono = 1, stereo would be 2
                      Default: 1
                      Examples: 1 / 2 / 6 / 8

ai-blocksize          Specify the block size at which audio is processed.
                      Default: 1024
                      Examples: 512 / 1024 / 2048

mo-device             Specify the MIDI device to be used to send midi data. Can be
                      empty in which case the default device is used
                      Example: MIDIOUT2 (BCR2000)

mo-api                Specify the MIDI host API to be used. Can be empty in which
                      case the default api is used. On some systems, for example
                      on Windows, there is only one API anyway.
                      Example: MMSystem

midi-notes            Specify the MIDI notes to be played. Can be specified as a
                      single note
                      Default: 0-127
                      Examples: 60 / 0-127 / 30,60,90

midi-velocities       Specify the velocities for note on events.
                      Default: 127
                      Examples: 60 / 0-127 / 30,60,90

midi-programs         A list of program changes that are sent to the device
                      Examples: 60 / 0-127 / 30,60,90

pause-before          Pause time in seconds before the next note is being recorded.
                      During this time, program changes are sent, if applicable
                      Default: 0.5
                      Example: 1.0

pause-after           Additional pause time in seconds after release has finished.
                      Default: 0.5
                      Example: 1.0

sustain-time          Specify how many seconds a note is held down before released.
                      Default: 3
                      Example: 3.5

release-time          Specify how many seconds recording is continued after a note
                      has been released.
                      Default: 1
                      Example: 3.5

release-velocity      Release velocity that is sent to the device when a note is
                      released.
                      Default:
                      Example: 3.5

midi-channel          The MIDI channel that events are sent on. Range 0-15
                      Default:
                      Examples: 0 / 15

noisefloor-duration   Noise floor is detected after program start, used to trim
                      wave files to remove silence before/after the recording of
                      a note. Specify the duration of noise floor detected here.
                      Default: 2
                      Examples: 3.0 / 5

filename              Specify the filename that is used to create a recording. Some
                      variables can be used to customize the file name and the path:

                      {note} Note number in range 0-127

                      {key} Note a human readable string like C#4. F#3, range is
                      C-2 to G8

                      {velocity} Velocity in range 0-127

                      {program} Program change in range 0-127
                      Example: ~/autosampler/device/patch{program}/{note}_{key}_{velocity}.wav