Ah, I'm tired of reading the Linux Kernel documentation, so toys came out and I played.

Finally: I tried moving Pocket Miku with Rust

――It's good that things move. --low level / raw level Important for debugging.

Reference material

We examined based on the contents of the following site. However, I haven't changed my voice yet, so I'd like to consider it a little more ...

-Linux Bimbo Road-Tomorrow is ALSA Program -[Pocket Miku (NSX-39) SysEx Memo](http://mergecells.hatenablog.com/entry/2016/10/04/231818#%E3%81%AA%E3%81%9C%E3% 83% 9D% E3% 82% B1% E3% 83% 9F% E3% 82% AF% E3% 81% A7SysEx% E3% 81% 8C% E5% BF% 85% E8% A6% 81% E3% 81% AA% E3% 81% AE% E3% 81% 8B)

What did you want to do

I wondered if I could use RUST to move the "Pocket Miku" that came out after cleaning up.

Check the ID etc. recognized by alsa.

When I checked using the account command, it looks like "20: 0" because it is NSX-39.

[kmtr@localhost rust-alsa]$ sudo LANG=C aconnect -l
client 0: 'System' [type=kernel]
    0 'Timer           '
    1 'Announce        '
client 14: 'Midi Through' [type=kernel]
    0 'Midi Through Port-0'
client 16: 'Ensoniq AudioPCI' [type=kernel,card=0]
    0 'ES1371          '
client 20: 'NSX-39' [type=kernel,card=1]
    0 'NSX-39 MIDI 1   '
[kmtr@localhost rust-alsa]$

Incorporate a library for manipulating midi with rust (ALSA)

Added alsa and clap to Cargo.toml.

`Cargo.toml`


[package]
name = "rust-alsa"
version = "0.1.0"
authors = ["kmtr"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
alsa = "0.4.2"
clap = "2.20"

Make a sound from Pocket Miku via alsa

rust's alsa wrapper This is neither in one hand nor in this one. For the time being, I confirmed that there was a sound.

`src/main.rs`


extern crate alsa;

use std::error;
use alsa::seq;
use std::ffi::CString;
use std::thread::sleep;
use std::time::Duration;

const DEFAULT_NAME: &str = "RUSTMIKU";
const MIKU_ID:   i32 = 20;
const MIKU_PORT: i32 = 0;

fn note( s: &alsa::Seq, evt : alsa::seq::EventType,  channel : u8, note: u8, velocity : u8, s_port:i32)
{
        let o_note = alsa::seq::EvNote {
                channel,
                note,
                velocity,
                off_velocity: 0,
                duration: 0
        };
        let mut o_event = alsa::seq::Event::new( evt , &o_note );

        o_event.set_direct();
        o_event.set_source( s_port );
        o_event.set_dest( alsa::seq::Addr { client: MIKU_ID, port: MIKU_PORT } );
        s.event_output( &mut o_event ) ;
        s.drain_output();
}

fn sing() -> Result<alsa::Seq,  Box<dyn error::Error> > {
        // snd_seq_open()
        let miku = alsa::Seq::open( None, Some(alsa::Direction::Playback), false ) ?;

        // snd_seq_create_simple_port()
        let cstr = CString::new(DEFAULT_NAME)?;
        let client_port = miku.create_simple_port(&cstr,
                alsa::seq::PortCap::READ,
                alsa::seq::PortType::MIDI_GENERIC | alsa::seq::PortType::APPLICATION )?;

        // subscribe_port()
        let client_id = miku.client_id()?;
        let subs = seq::PortSubscribe::empty()?;
        subs.set_dest  (seq::Addr { client: MIKU_ID,   port: MIKU_PORT } );
        subs.set_sender(seq::Addr { client: client_id, port: client_port });
        miku.subscribe_port(&subs)?;

        // Note on
        note ( &miku, alsa::seq::EventType::Noteon,  0, 60, 64, client_port );

        // Wait
        sleep ( Duration::from_millis(1000) );

        // Note off
        note ( &miku, alsa::seq::EventType::Noteoff, 0, 60, 64, client_port );

        Ok(miku)
}

fn main() {
        sing();
}

It was strace that helped debug

At first, I was wondering why there was no sound. At this time, it was strace that was useful for debugging.

fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
ioctl(3, SNDRV_SEQ_IOCTL_PVERSION, 0x7ffe4a9ffeb8) = 0
ioctl(3, SNDRV_SEQ_IOCTL_CLIENT_ID, 0x7ffe4a9ffebc) = 0
ioctl(3, SNDRV_SEQ_IOCTL_RUNNING_MODE, 0x7ffe4a9ffec0) = 0
ioctl(3, SNDRV_SEQ_IOCTL_CREATE_PORT, 0x7ffe4aa00260) = 0
ioctl(3, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, 0x560006f2b5b0) = 0
write(3, "\5\0\0\375\0\0\0\0\0\0\0\0\0\0\24\0\0<@\0\0\0\0\0\0\0\0\0", 28) = -1 EINVAL (Invalid argument)
nanosleep({tv_sec=1, tv_nsec=0}, 0x7ffe4aa00340) = 0
write(3, "\5\0\0\375\0\0\0\0\0\0\0\0\0\0\24\0\0<@\0\0\0\0\0\0\0\0\0\7\0\0\375"..., 56) = -1 EINVAL (Invalid argument)
close(3)                                = 0
sigaltstack({ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=8192}, NULL) = 0
munmap(0x7f57fe537000, 8192)            = 0
exit_group(0)                           = ?
+++ exited with 0 +++

Hmm? I can't handle anything. so,

note (& miku, alsa :: seq :: EventType :: Note, 0, 60, 64, client_port); You noticed that note (& miku, alsa :: seq :: EventType :: Noteon, 0, 60, 64, client_port);`.

fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
ioctl(3, SNDRV_SEQ_IOCTL_PVERSION, 0x7ffc72b00148) = 0
ioctl(3, SNDRV_SEQ_IOCTL_CLIENT_ID, 0x7ffc72b0014c) = 0
ioctl(3, SNDRV_SEQ_IOCTL_RUNNING_MODE, 0x7ffc72b00150) = 0
ioctl(3, SNDRV_SEQ_IOCTL_CREATE_PORT, 0x7ffc72b004f0) = 0
ioctl(3, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, 0x556f313ee5b0) = 0
write(3, "\6\0\0\375\0\0\0\0\0\0\0\0\0\0\24\0\0<@\0\0\0\0\0\0\0\0\0", 28) = 28
nanosleep({tv_sec=1, tv_nsec=0}, 0x7ffc72b005d0) = 0
write(3, "\7\0\0\375\0\0\0\0\0\0\0\0\0\0\24\0\0<@\0\0\0\0\0\0\0\0\0", 28) = 28
close(3)                                = 0
sigaltstack({ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=8192}, NULL) = 0
munmap(0x7f59d2ff5000, 8192)            = 0
exit_group(0)

After all, debugging at raw level / low level is important! !!

TODO

I want to use sysex to change what I say ...

That's it.

Use Rust to move Pocket Miku.