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authorGalen Guyer <galen@galenguyer.com>2022-11-28 13:07:47 -0500
committerGalen Guyer <galen@galenguyer.com>2022-11-28 13:07:47 -0500
commitf5319daf3fc87c93ea6a770d3885f999cf3775a9 (patch)
treedab2e438515c29506584bfba8f1f33d84edadfcf
parent95e6b7489c1f937921061a1872705e456546fc83 (diff)
Python and Rust UDP audio streaming in real time
-rw-r--r--.gitignore5
-rw-r--r--Cargo.lock1289
-rw-r--r--Cargo.toml12
-rw-r--r--requirements.txt4
-rw-r--r--src/main.rs93
-rw-r--r--udp-audio.py6
6 files changed, 1406 insertions, 3 deletions
diff --git a/.gitignore b/.gitignore
index f7275bb..cabb7ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,6 @@
venv/
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..400414f
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8c740fa
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "udp-audio"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+chrono = "0.4.23"
+cpal = "0.14.1"
+dasp = { version = "0.11.0", features = ["all"] }
+ringbuf = "0.3.1"
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..070bddd
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+matplotlib==3.6.2
+numpy==1.23.5
+PyAudio==0.2.12
+scipy==1.9.3
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b9d044f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,93 @@
+use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
+use ringbuf::HeapRb;
+use std::net::UdpSocket;
+
+fn init_cpal() -> (cpal::Device, cpal::SupportedStreamConfig) {
+ let host = cpal::default_host();
+ let device = host
+ .devices()
+ .expect("no output device available")
+ .nth(4)
+ .expect("couldn't find device");
+
+ let mut supported_configs_range = device
+ .supported_output_configs()
+ .expect("error while querying configs");
+
+ let supported_config = supported_configs_range
+ .next()
+ .expect("no supported config?!")
+ .with_sample_rate(cpal::SampleRate(8000));
+
+ dbg!(device.name().unwrap());
+ (device, dbg!(supported_config))
+}
+
+fn write_audio<T: cpal::Sample + std::fmt::Debug>(
+ data: &mut [T],
+ samples: &mut ringbuf::HeapConsumer<T>,
+ _cbinfo: &cpal::OutputCallbackInfo,
+) {
+ for d in data {
+ // copy as many samples as we have.
+ // if we run out, write silence
+ match samples.pop() {
+ Some(sample) => *d = sample,
+ None => *d = cpal::Sample::from(&0.0),
+ }
+ }
+}
+
+fn main() {
+ let socket = UdpSocket::bind("0.0.0.0:9123").expect("couldn't bind to address");
+
+ let (device, stream_config) = init_cpal();
+
+ let buffer = HeapRb::<i16>::new(8192);
+ let (mut producer, mut consumer) = buffer.split();
+
+ let mut curr_tg: Option<u32> = None;
+
+ let audio_stream = match stream_config.sample_format() {
+ cpal::SampleFormat::I16 => device
+ .build_output_stream(
+ &stream_config.into(),
+ move |data: &mut [i16], cbinfo| write_audio(data, &mut consumer, cbinfo),
+ |err| eprintln!("error occurred on the audio output stream: {}", err),
+ )
+ .unwrap(),
+ _ => unimplemented!(),
+ };
+
+ audio_stream.play().expect("unable to start audio stream");
+
+ let mut buf = [0; 2048];
+ loop {
+ let (number_of_bytes, _src_addr) = socket.recv_from(&mut buf).expect("Didn't receive data");
+ let filled_buf = &mut buf[..number_of_bytes];
+ let tg = u32::from_le_bytes(
+ filled_buf[..4]
+ .try_into()
+ .expect("slice with incorrect length"),
+ );
+
+ match curr_tg {
+ Some(curr_tg) => {
+ if curr_tg != tg {
+ continue;
+ }
+ }
+ None => {
+ curr_tg = Some(tg);
+ }
+ }
+
+ println!("TalkGroup: {tg}: {} bytes", filled_buf.len() - 4);
+ let audio_bytes = &filled_buf[4..];
+ for sample in audio_bytes.chunks_exact(2) {
+ let sample =
+ i16::from_le_bytes(sample.try_into().expect("slice with incorrect length"));
+ producer.push(sample).expect("buffer full");
+ }
+ }
+}
diff --git a/udp-audio.py b/udp-audio.py
index d6d86a0..4ab3ec7 100644
--- a/udp-audio.py
+++ b/udp-audio.py
@@ -57,7 +57,7 @@ def receive_audio():
audio_data = data[4:]
if len(audio_data) < 128:
continue
- print(f"TGID: {tgid}, audio_data: {len(audio_data)}")
+ # print(f"TGID: {tgid}, audio_data: {len(audio_data)}")
signal = np.frombuffer(audio_data, dtype=np.int16)
res = scipy.signal.resample(signal, (len(signal) * OUT_RATE) // IN_RATE).astype(np.int16)
FRAMES.append(res)
@@ -70,10 +70,10 @@ def play_audio():
global FRAMES
while True:
while len(FRAMES) == 0:
- time.sleep(1)
+ time.sleep(0.1)
frames = FRAMES[:]
FRAMES.clear()
- print(f"Playing {len(frames)} frames")
+ # print(f"Playing {len(frames)} frames")
for frame in frames:
stream.write(frame.tobytes())