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projekte:hoerspielpi
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projekte:hoerspielpi [2018-11-02 10:27] stegro angelegt |
projekte:hoerspielpi [2018-11-02 10:39] (aktuell) stegro add new project page for HoerspielPi |
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| ====== HoerspielPi ====== | ====== HoerspielPi ====== | ||
| + | |||
| + | ===== Purpose ===== | ||
| ('Hörspiel' is german for 'radioplay') | ('Hörspiel' is german for 'radioplay') | ||
| Zeile 8: | Zeile 10: | ||
| (video to be uploaded yet) | (video to be uploaded yet) | ||
| - | *I have not practised playing piano for quite a while, please excuse my | + | //I have not practised playing piano for quite a while, please excuse my |
| - | horrible touch in this video.* But i hope you get the idea. | + | horrible touch in this video.// But i hope you get the idea. |
| HoerspielPi is essentially a headless RaspberryPI 3, running Raspbian | HoerspielPi is essentially a headless RaspberryPI 3, running Raspbian | ||
| Zeile 26: | Zeile 28: | ||
| rec_thresh, maybe). | rec_thresh, maybe). | ||
| - | ## Hardware | ||
| - | * Raspberry Pi 3 B | + | ===== Hardware ===== |
| - | * a 8x8 matrix of red leds, with max7219 driver, connected to the | + | |
| - | Raspberry Pi via SPI | + | |
| - | * a button (broken out of an old PC), connected between Pin 5 and | + | |
| - | GND. This allows booting and shutting down the Pi properly. | + | |
| - | * a cheap USB soundcard. USB soundcards are said to allow only for | + | |
| - | moderate latency, but HoerspielPi is not really meant for making | + | |
| - | music anyway. This is why latency is not very important here, and I | + | |
| - | have not really tried to optimise for it. Instead, the soundcard | + | |
| - | being external makes the thing modular, in case I want to use the | + | |
| - | card otherwise. | + | |
| - | * a simple audio mixer, to feed mics or instruments into the soundcard | + | * Raspberry Pi 3 B |
| - | which has just 1 line input *or* 1 microphone input. | + | * a 8x8 matrix of red leds, with max7219 driver, connected to the Raspberry Pi via SPI |
| - | * an electronic piano, connected via USB-MIDI to the Pi. | + | * a button (broken out of an old PC), connected between Pin 5 and GND. This allows booting and shutting down the Pi properly. |
| + | * a cheap USB soundcard. USB soundcards are said to allow only for moderate latency, but HoerspielPi is not really meant for making music anyway. This is why latency is not very important here, and I have not really tried to optimise for it. Instead, the soundcard being external makes the thing modular, in case I want to use the card otherwise. | ||
| + | * a simple audio mixer, to feed mics or instruments into the soundcard which has just 1 line input *or* 1 microphone input. | ||
| + | * an electronic piano, connected via USB-MIDI to the Pi. | ||
| - |  | + | {{ :projekte:hoerspielpi_drawing.png?400 |}} |
| - | ## Software | + | ===== Software ===== |
| - | * Raspbian | + | * Raspbian |
| + | * jack2 | ||
| + | * sooperlooper engine http://essej.net/sooperlooper/ Sooperlooper is written with an engine separated from the GUI. HoerspielPi only starts the engine, not slgui (the standard GUI). | ||
| + | * a sooperloooper GUI python script (written by me), to display some sooperlooper states and values on the 8x8 led matrix. It communicates with the engine using OSC messages. | ||
| + | * a mididings script, to split the midi note messages of the piano into 2 ranges, 'piano' and 'looper-control'. | ||
| + | - The 'looper-control' range is everything above a certain note, 'c5' for me. The script transposes these notes to be next to 'c2' and sends them, actually to sooperlooper and the midi emulation script. This way, i can keep the sooperlooper bindings the same, no matter which octave is used for its midi control. | ||
| + | - The 'piano' range is not transposed and just passed further, actually back into the piano. Since the piano is configured not to produce sounds for keypresses, but only for incoming midi, this makes the 'looper-control' range silent. | ||
| + | * a python script to listen for a very long keypress (anywhere on the piano), of at least 10 seconds. When this is detected, it modifies the config file of the mididings script to do the keyboard splitting at precisely this note, and reboot. This way, the pressed key will become the "prev", and the neighbouring ones be bind to the other commands, in order. Hence, this is not a full midi learning mechanism, but it allows to plug also a small midi keyboard to HoerspielPi, and use it. | ||
| - | * jack2 | + | * an python script (written by me), to emulate certain midi messages |
| - | + | - it emulates CC (control change): the value can be in-/decremented with piano key presses. The more velocity the note has, the more the control value changes. | |
| - | * sooperlooper engine http://essej.net/sooperlooper/ Sooperlooper is | + | - it detects notes lasting for longer than 2 seconds. When this is detected, first a note_on msg will be sent again, and then secondly a note_on at *one octave higher*. The sooperlooper midi binding uses this to do 'pause', 'reverse' and 'undo_all' commands either for the selected loop (short keypress) or all loops (long keypress) |
| - | written with an engine separated from the GUI. HoerspielPi only | + | * a python script to put an interrupt, to execute a command line when the button is pressed. This is used to shut down cleanly. |
| - | starts the engine, not slgui (the standard GUI). | + | * a script which displays simple splash animations on boot and shutdown. The shutdown runs neatly from the moment the button is pressed, to (almost) the moment the Pi is off. For the boot splash I could not find a way to display it really early and to make it stop (e.g. by systemd service conflict) when the dotmatrix is used by the sooperlooper client. So this has a fixed duration and actually prolongates the booting... but dont tell anyone (and hey, zynthian seems to do the same). |
| - | + | * a python script which tries to find the correct soundcard and start jackd with reasonable parameters, to avoid xruns. | |
| - | * a sooperloooper GUI python script (written by me), to display some | + | |
| - | sooperlooper states and values on the 8x8 led matrix. It | + | |
| - | communicates with the engine using OSC messages. | + | |
| - | + | ||
| - | * a mididings script, to split the midi note messages of the piano into 2 ranges, 'piano' and 'looper-control'. | + | |
| - | - The 'looper-control' range is everything above a certain note, 'c5' for me. | + | |
| - | The script transposes these notes to be next to 'c2' and sends them, actually to sooperlooper and the midi emulation script. | + | |
| - | This way, i can keep the sooperlooper bindings the same, no matter which octave is used for its midi control. | + | |
| - | + | ||
| - | - The 'piano' range is not transposed and just passed further, actually back into the piano. | + | |
| - | Since the piano is configured not to produce sounds for keypresses, but only for | + | |
| - | incoming midi, this makes the 'looper-control' range silent. | + | |
| - | + | ||
| - | * a python script to listen for a very long keypress (anywhere on the | + | |
| - | piano), of at least 10 seconds. When this is detected, it modifies | + | |
| - | the config file of the mididings script to do the keyboard splitting | + | |
| - | at precisely this note, and reboot. This way, the pressed key will | + | |
| - | become the "prev", and the neighbouring ones be bind to the other | + | |
| - | commands, in order. Hence, this is not a full midi learning | + | |
| - | mechanism, but it allows to plug also a small midi keyboard to | + | |
| - | HoerspielPi, and use it. | + | |
| - | + | ||
| - | * an python script (written by me), to emulate certain midi messages | + | |
| - | - it emulates CC (control change): the value can be in-/decremented with piano key presses. | + | |
| - | The more velocity the note has, the more the control value changes. | + | |
| - | - it detects notes lasting for longer than 2 seconds. When this is | + | |
| - | detected, first a note_on msg will be sent again, and then secondly | + | |
| - | a note_on at *one octave higher*. | + | |
| - | The sooperlooper midi binding uses this to do 'pause', 'reverse' | + | |
| - | and 'undo_all' commands either for the selected loop (short keypress) | + | |
| - | or all loops (long keypress) | + | |
| - | + | ||
| - | * a python script to put an interrupt, to execute a command line when the button is | + | |
| - | pressed. This is used to shut down cleanly. | + | |
| - | + | ||
| - | * a script which displays simple splash animations on boot and | + | |
| - | shutdown. The shutdown runs neatly from the moment the button is | + | |
| - | pressed, to (almost) the moment the Pi is off. For the boot splash I | + | |
| - | could not find a way to display it really early and to make it stop | + | |
| - | (e.g. by systemd service conflict) when the dotmatrix is used by the | + | |
| - | sooperlooper client. So this has a fixed duration and actually | + | |
| - | prolongates the booting... but dont tell anyone (and hey, zynthian | + | |
| - | seems to do the same). | + | |
| - | + | ||
| - | * a python script which tries to find the correct soundcard and start jackd with reasonable parameters, to avoid xruns. | + | |
| The whole thing is set up as a (crude, does not pass lintian cleanly, | The whole thing is set up as a (crude, does not pass lintian cleanly, | ||
| Zeile 113: | Zeile 69: | ||
| Python3 is used as much as possible, except for mididings, which I was not able to install for python3. | Python3 is used as much as possible, except for mididings, which I was not able to install for python3. | ||
| - | ## Usage | + | ===== Usage ===== |
| 1. Install Rasbian or one of its minimal derivates on the SD of your Pi | 1. Install Rasbian or one of its minimal derivates on the SD of your Pi | ||
| Zeile 120: | Zeile 77: | ||
| 4. reboot. | 4. reboot. | ||
| - | ### What the display shows | + | ==== What the display shows ==== |
| The 8x8 led matrix displays the selected loop as a number. The top line | The 8x8 led matrix displays the selected loop as a number. The top line | ||
| Zeile 133: | Zeile 91: | ||
| pause, play, mute, record, overdub, substitute, multiply, sync | pause, play, mute, record, overdub, substitute, multiply, sync | ||
| - | ### About sync | + | ==== About sync ==== |
| There is only one key dedicated to sync at the moment. This key is | There is only one key dedicated to sync at the moment. This key is | ||
| Zeile 142: | Zeile 101: | ||
| discover how it works best for me. | discover how it works best for me. | ||
| - | ## ToDo | + | == ToDo == |
| At the moment HoerspielPi lacks: | At the moment HoerspielPi lacks: | ||
| - | [ ] visualisation of many sooperlooper settings I considered | + | * visualisation of many sooperlooper settings I considered irrelevant for me |
| - | irrelevant for me | + | * other functionality than looping (what about some atmo recordings, or samples?) |
| - | [ ] other functionality than looping (what about some atmo recordings, | + | |
| - | or samples?) | + | |
| There are still about 4*6=24 pixels unused... | There are still about 4*6=24 pixels unused... | ||
projekte/hoerspielpi.txt · Zuletzt geändert: 2018-11-02 10:39 von stegro
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