diff options
author | Galen Guyer <galen@galenguyer.com> | 2022-11-28 13:07:47 -0500 |
---|---|---|
committer | Galen Guyer <galen@galenguyer.com> | 2022-11-28 13:07:47 -0500 |
commit | f5319daf3fc87c93ea6a770d3885f999cf3775a9 (patch) | |
tree | dab2e438515c29506584bfba8f1f33d84edadfcf | |
parent | 95e6b7489c1f937921061a1872705e456546fc83 (diff) |
Python and Rust UDP audio streaming in real time
-rw-r--r-- | .gitignore | 5 | ||||
-rw-r--r-- | Cargo.lock | 1289 | ||||
-rw-r--r-- | Cargo.toml | 12 | ||||
-rw-r--r-- | requirements.txt | 4 | ||||
-rw-r--r-- | src/main.rs | 93 | ||||
-rw-r--r-- | udp-audio.py | 6 |
6 files changed, 1406 insertions, 3 deletions
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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()) |