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Make noises on Ubuntu 18.04 with Pulseaudio #2

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Make noises on Ubuntu 18.04 with Pulseaudio #2

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30 changes: 25 additions & 5 deletions src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,7 @@ use coreaudio::audio_unit::{AudioUnit, IOType, SampleFormat, Scope};
use coreaudio::audio_unit::render_callback::{self, data};

#[cfg(not(target_os = "macos"))]
use cpal::{EventLoop, StreamData, UnknownTypeOutputBuffer};
use cpal::{EventLoop, Format, SampleRate, SampleFormat, StreamData, UnknownTypeOutputBuffer};

#[cfg(not(target_os = "macos"))]
use midir::MidiInput;
Expand Down Expand Up @@ -122,9 +122,9 @@ impl Midi {
}

fn main() {
let (mut worker, tx, rx) = Worker::create(1024);
let (mut worker, tx, _rx) = Worker::create(1024);

/*
// Section uncommented to make noises without a user interface.
let module = Box::new(modules::ConstCtrl::new(440.0f32.log2()));
worker.handle_node(Node::create(module, 1, [], []));
let module = Box::new(modules::Sin::new(44_100.0));
Expand All @@ -135,8 +135,9 @@ fn main() {
worker.handle_node(Node::create(module, 4, [], [(3, 0)]));
let module = Box::new(modules::Sum);
worker.handle_node(Node::create(module, 0, [(2, 0), (4, 0)], []));
*/

// Section commented out to make noises without a user interface (see above).
/*
let module = Box::new(modules::Saw::new(44_100.0));
worker.handle_node(Node::create(module, 1, [], [(5, 0)]));
let module = Box::new(modules::SmoothCtrl::new(880.0f32.log2()));
Expand All @@ -160,6 +161,7 @@ fn main() {
worker.handle_node(Node::create(module, 13, [], []));
let module = Box::new(modules::SmoothCtrl::new(5.0));
worker.handle_node(Node::create(module, 14, [], []));
*/

#[cfg(target_os = "macos")]
run_mac(worker, tx);
Expand All @@ -172,12 +174,26 @@ fn main() {
fn run_cpal(mut worker: Worker, tx: Sender<Message>) {
let event_loop = EventLoop::new();
let device = cpal::default_output_device().expect("no output device");

/*
let mut supported_formats_range = device.supported_output_formats()
.expect("error while querying formats");
let format = supported_formats_range.next()
.expect("no supported format?!")
.with_max_sample_rate();
println!("format: {:?}", format);
*/
// On Ubuntu 18.04 with Pulseaudio, the "with_max_sample_rate" method returns
// Format { channels: 1, sample_rate: SampleRate(192_000), data_type: I16 }
// but the code assumes:
// Format { channels: 2, sample_rate: SampleRate(44_100), data_type: F32 }
// so we might as well hard-wire it.
let format = Format{
channels: 2,
sample_rate: SampleRate(44_100),
data_type: SampleFormat::F32,
};

let stream_id = event_loop.build_output_stream(&device, &format).unwrap();
event_loop.play_stream(stream_id);

Expand All @@ -200,7 +216,11 @@ fn run_cpal(mut worker: Worker, tx: Sender<Message>) {
let mut buf_slice = buf.deref_mut();
let mut i = 0;
let mut timestamp = time::precise_time_ns();
while i < buf_slice.len() {
// cpal might return a buffer whose length is not a multiple of
// 64 (i.e. 8820): if we try to fill the too short tail we get
// an "index out of bounds" panic. The resulting audio is
// scratchy though, because we're not filling the whole buffer.
while i < buf_slice.len() / (2 * N_SAMPLES_PER_CHUNK) * (2 * N_SAMPLES_PER_CHUNK) {
// should let the graph generate stereo
let buf = worker.work(timestamp)[0].get();
for j in 0..N_SAMPLES_PER_CHUNK {
Expand Down