From f534ca7e5d019755f8d670a4bc9b2b9d2a308f08 Mon Sep 17 00:00:00 2001 From: Skyler Lehmkuhl Date: Fri, 24 Jan 2025 16:27:19 -0500 Subject: [PATCH] Start work on audio handler in Rust --- lightningbeam-core/Cargo.lock | 1054 +++++++++++++++++++++++++++++++ lightningbeam-core/Cargo.toml | 28 + lightningbeam-core/src/audio.rs | 105 +++ lightningbeam-core/src/lib.rs | 111 ++++ lightningbeam-core/src/time.rs | 136 ++++ 5 files changed, 1434 insertions(+) create mode 100644 lightningbeam-core/Cargo.lock create mode 100644 lightningbeam-core/Cargo.toml create mode 100644 lightningbeam-core/src/audio.rs create mode 100644 lightningbeam-core/src/lib.rs create mode 100644 lightningbeam-core/src/time.rs diff --git a/lightningbeam-core/Cargo.lock b/lightningbeam-core/Cargo.lock new file mode 100644 index 0000000..9db978d --- /dev/null +++ b/lightningbeam-core/Cargo.lock @@ -0,0 +1,1054 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + 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b/lightningbeam-core/Cargo.toml @@ -0,0 +1,28 @@ +[package] +name = "lightningbeam-core" +version = "0.1.0" +edition = "2021" + +[lib] +crate-type = ["cdylib", "rlib"] + +[dependencies] +serde = { version = "1.0", features = ["derive"] } +wasm-bindgen = "0.2" +cpal = "0.14" + +[dependencies.web-sys] +version = "0.3.22" +features = ["console"] + +# The `console_error_panic_hook` crate provides better debugging of panics by +# logging them with `console.error`. This is great for development, but requires +# all the `std::fmt` and `std::panicking` infrastructure, so it's only enabled +# in debug mode. +[target."cfg(debug_assertions)".dependencies] +console_error_panic_hook = "0.1.5" + +[features] +default = ["native"] +native = [] +wasm = [] diff --git a/lightningbeam-core/src/audio.rs b/lightningbeam-core/src/audio.rs new file mode 100644 index 0000000..16a7dba --- /dev/null +++ b/lightningbeam-core/src/audio.rs @@ -0,0 +1,105 @@ +use cpal::traits::{DeviceTrait, HostTrait, StreamTrait}; +use cpal::{SampleFormat, SampleRate, Stream, StreamConfig}; +use cpal::{BufferSize, SupportedBufferSize}; +use std::sync::{Arc, Mutex}; +use crate::AudioOutput; + +pub struct CpalAudioOutput { + stream: Option, + buffer: Arc>>, // Shared buffer for audio chunks + sample_rate: u32, + channels: u16, +} + +impl CpalAudioOutput { + pub fn new(sample_rate: u32, channels: u16) -> Self { + Self { + stream: None, + buffer: Arc::new(Mutex::new(Vec::new())), + sample_rate, + channels, + } + } +} + +impl AudioOutput for CpalAudioOutput { + fn start(&mut self) -> Result<(), Box> { + let host = cpal::default_host(); + let device = host + .default_output_device() + .ok_or("No output device available")?; + let supported_config = device + .default_output_config().unwrap(); + // .with_sample_rate(SampleRate(self.sample_rate)); + let config = StreamConfig { + channels: self.channels, + sample_rate: SampleRate(self.sample_rate), + buffer_size: match supported_config.buffer_size() { + SupportedBufferSize::Range { min, max: _ } => BufferSize::Fixed(*min), + SupportedBufferSize::Unknown => BufferSize::Default, + }, + }; + + let buffer = self.buffer.clone(); + let sample_format = supported_config.sample_format(); + + let stream = match sample_format { + SampleFormat::F32 => device.build_output_stream( + &config, + move |data: &mut [f32], _| { + let mut buffer = buffer.lock().unwrap(); + for (out_sample, buffer_sample) in data.iter_mut().zip(buffer.iter()) { + *out_sample = *buffer_sample; + } + buffer.clear(); // Clear buffer after playback + }, + move |err| { + eprintln!("Audio stream error: {:?}", err); + }, + ), + SampleFormat::I16 => device.build_output_stream( + &config, + move |data: &mut [i16], _| { + let mut buffer = buffer.lock().unwrap(); + for (out_sample, buffer_sample) in data.iter_mut().zip(buffer.iter()) { + *out_sample = (*buffer_sample * i16::MAX as f32) as i16; + } + buffer.clear(); + }, + move |err| { + eprintln!("Audio stream error: {:?}", err); + }, + ), + SampleFormat::U16 => device.build_output_stream( + &config, + move |data: &mut [u16], _| { + let mut buffer = buffer.lock().unwrap(); + for (out_sample, buffer_sample) in data.iter_mut().zip(buffer.iter()) { + *out_sample = ((*buffer_sample + 1.0) * 0.5 * u16::MAX as f32) as u16; + } + buffer.clear(); + }, + move |err| { + eprintln!("Audio stream error: {:?}", err); + }, + ), + }; + + // If the stream creation failed, return the error + let stream = stream.map_err(|e| { + format!( + "Failed to build output stream for sample format {:?}: {:?}", + sample_format, e + ) + })?; + + stream.play()?; + self.stream = Some(stream); + Ok(()) + } + + fn play_chunk(&mut self, chunk: Vec) { + let mut buffer = self.buffer.lock().unwrap(); + buffer.extend(chunk); + } +} \ No newline at end of file diff --git a/lightningbeam-core/src/lib.rs b/lightningbeam-core/src/lib.rs new file mode 100644 index 0000000..a3d36e2 --- /dev/null +++ b/lightningbeam-core/src/lib.rs @@ -0,0 +1,111 @@ +mod time; +use time::{Timestamp, Duration, Frame}; +mod audio; +use audio::{CpalAudioOutput}; + +#[cfg(feature = "wasm")] +use wasm_bindgen::prelude::*; + +pub trait AudioTrack { + /// Render a chunk of audio for the given timestamp and duration. + fn render_chunk(&self, timestamp: Timestamp, duration: Duration) -> Vec; + + /// Get the sample rate of the audio track. + fn sample_rate(&self) -> u32; +} + +pub trait VideoTrack { + /// Render a frame for the given timestamp. + fn render_frame(&self, timestamp: Timestamp) -> Frame; + + /// Get the frame rate of the video track. + fn frame_rate(&self) -> f64; +} + +pub struct TrackManager { + audio_tracks: Vec>, + video_tracks: Vec>, + sample_rate: u32, + frame_duration: Duration, // Duration of each frame in seconds (e.g., 1/60 for 60 FPS) +} + +impl TrackManager { + pub fn new(sample_rate: u32, frame_duration: f64) -> Self { + Self { + audio_tracks: Vec::new(), + video_tracks: Vec::new(), + sample_rate, + frame_duration: Duration::new(frame_duration), + } + } + + pub fn add_audio_track(&mut self, track: Box) { + self.audio_tracks.push(track); + } + + pub fn add_video_track(&mut self, track: Box) { + self.video_tracks.push(track); + } + + pub fn play(&mut self, timestamp: Timestamp, audio_output: &mut dyn AudioOutput, video_output: &mut dyn FrameTarget) { + let mut timestamp = timestamp.clone(); + + // Main playback loop + loop { + // Render and play audio chunks + let mut audio_mix: Vec = vec![0.0; self.frame_duration.to_samples(self.sample_rate) as usize]; + for track in &mut self.audio_tracks { + let chunk = track.render_chunk(timestamp, self.frame_duration); + for (i, sample) in chunk.iter().enumerate() { + audio_mix[i] += sample; // Simple mixing (sum of samples) + } + } + audio_output.play_chunk(audio_mix); + + // Render video frames + for track in &self.video_tracks { + let track_frame = track.render_frame(timestamp); + } + + // Update timestamp + timestamp += self.frame_duration; + + // Break condition (e.g., end of tracks) + if self.audio_tracks.iter().all(|t| t.render_chunk(timestamp, self.frame_duration).is_empty()) { + break; + } + } + } +} + +pub trait AudioOutput { + fn start(&mut self) -> Result<(), Box>; + fn play_chunk(&mut self, chunk: Vec); +} + +pub trait FrameTarget { + fn draw(&mut self, frame: &[u8], width: u32, height: u32); +} + +#[cfg(test)] +mod tests { + use super::*; + + // #[test] + // fn it_works() { + // let result = add(2, 2); + // assert_eq!(result, 4); + // } +} + +// This is like the `main` function, except for JavaScript. +#[cfg(feature="wasm")] +#[wasm_bindgen(start)] +pub fn main_js() -> Result<(), JsValue> { + // This provides better error messages in debug mode. + // It's disabled in release mode so it doesn't bloat up the file size. + #[cfg(debug_assertions)] + console_error_panic_hook::set_once(); + + Ok(()) +} \ No newline at end of file diff --git a/lightningbeam-core/src/time.rs b/lightningbeam-core/src/time.rs new file mode 100644 index 0000000..4f21a13 --- /dev/null +++ b/lightningbeam-core/src/time.rs @@ -0,0 +1,136 @@ +/// A strongly-typed representation of a timestamp (seconds). +#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, serde::Serialize, serde::Deserialize)] +pub struct Timestamp(f64); + +/// A strongly-typed representation of a duration (seconds). +#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, serde::Serialize, serde::Deserialize)] +pub struct Duration(f64); + +impl Timestamp { + /// Create a new timestamp in seconds. + pub fn new(seconds: f64) -> Self { + Timestamp(seconds) + } + + /// Create a new timestamp from milliseconds. + pub fn from_millis(milliseconds: u64) -> Self { + Timestamp(milliseconds as f64 / 1000.0) + } + + /// Get the value in seconds. + pub fn as_seconds(&self) -> f64 { + self.0 + } + + /// Get the value in milliseconds. + pub fn as_millis(&self) -> u64 { + (self.0 * 1000.0).round() as u64 + } + + /// Add a duration to a timestamp, producing a new timestamp. + pub fn add_duration(&self, duration: Duration) -> Timestamp { + Timestamp(self.0 + duration.0) + } + + /// Subtract a duration from a timestamp, producing a new timestamp. + pub fn subtract_duration(&self, duration: Duration) -> Timestamp { + Timestamp(self.0 - duration.0) + } + + /// Subtract another timestamp, producing a duration. + pub fn subtract_timestamp(&self, other: Timestamp) -> Duration { + Duration(self.0 - other.0) + } +} + +impl Duration { + /// Create a new duration in seconds. + pub fn new(seconds: f64) -> Self { + Duration(seconds) + } + + /// Create a new duration from milliseconds. + pub fn from_millis(milliseconds: u64) -> Self { + Duration(milliseconds as f64 / 1000.0) + } + + /// Create a new duration from frames, given a frame rate. + pub fn from_frames(frames: u64, frame_rate: f64) -> Self { + Duration(frames as f64 / frame_rate) + } + + /// Get the value in seconds. + pub fn as_seconds(&self) -> f64 { + self.0 + } + + /// Get the value in milliseconds. + pub fn as_millis(&self) -> u64 { + (self.0 * 1000.0).round() as u64 + } + + /// Get the number of frames for this duration, given a frame rate. + pub fn to_frames(&self, frame_rate: f64) -> u64 { + (self.0 * frame_rate).round() as u64 + } + + /// Get the number of samples in this duration at a given sample rate + pub fn to_samples(&self, sample_rate: u32) -> u64 { + (self.0 * sample_rate as f64).round() as u64 + } + + /// Add two durations together. + pub fn add(&self, other: Duration) -> Duration { + Duration(self.0 + other.0) + } + + /// Subtract one duration from another. + pub fn subtract(&self, other: Duration) -> Duration { + Duration(self.0 - other.0) + } +} + +// Overloading operators for more natural usage +use std::ops::{Add, Sub, AddAssign, SubAssign}; + +impl Add for Timestamp { + type Output = Timestamp; + + fn add(self, duration: Duration) -> Timestamp { + self.add_duration(duration) + } +} + +impl Sub for Timestamp { + type Output = Timestamp; + + fn sub(self, duration: Duration) -> Timestamp { + self.subtract_duration(duration) + } +} + +impl AddAssign for Timestamp { + fn add_assign(&mut self, duration: Duration) { + self.0 += duration.0; + } +} + +impl SubAssign for Timestamp { + fn sub_assign(&mut self, duration: Duration) { + self.0 -= duration.0; + } +} + +/// Represents a video frame. +#[derive(Debug, Clone)] +pub struct Frame { + pub width: u32, + pub height: u32, + pub data: Vec, // RGBA pixel data +} + +impl Frame { + pub fn new(width: u32, height: u32, data: Vec) -> Self { + Frame { width, height, data } + } +}