From e113c53fb7de36e64b101d778f949a5d6d94a56e Mon Sep 17 00:00:00 2001 From: "se.cherkasov" Date: Fri, 13 Mar 2026 16:21:25 +0300 Subject: [PATCH] feat(desktop): replace audio stub with cpal backend and volume slider - CpalAudioSink writes to SPSC ring buffer, cpal callback reads - Graceful fallback to silent operation on audio device errors - Volume slider (0-100%) in header bar with speaker icon - Ring buffer cleared on ROM load and reset --- Cargo.lock | 687 +++++++++++++++++++++++++++++- crates/nesemu-desktop/Cargo.toml | 1 + crates/nesemu-desktop/src/main.rs | 126 +++++- 3 files changed, 793 insertions(+), 21 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index e3a7700..384f4a1 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -2,25 +2,92 @@ # It is not intended for manual editing. version = 4 +[[package]] +name = "aho-corasick" +version = "1.1.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = 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+version = "0.51.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5" diff --git a/crates/nesemu-desktop/Cargo.toml b/crates/nesemu-desktop/Cargo.toml index 725f36f..5214ffe 100644 --- a/crates/nesemu-desktop/Cargo.toml +++ b/crates/nesemu-desktop/Cargo.toml @@ -7,3 +7,4 @@ edition = "2024" nesemu = { path = "../.." } gtk4 = "0.8" cairo-rs = "0.19" +cpal = "0.15" diff --git a/crates/nesemu-desktop/src/main.rs b/crates/nesemu-desktop/src/main.rs index 5aa1a1e..3fb802e 100644 --- a/crates/nesemu-desktop/src/main.rs +++ b/crates/nesemu-desktop/src/main.rs @@ -1,6 +1,8 @@ use std::cell::RefCell; use std::path::{Path, PathBuf}; use std::rc::Rc; +use std::sync::atomic::{AtomicU32, Ordering as AtomicOrdering}; +use std::sync::Arc; use std::time::Duration; use gtk::gio; @@ -11,7 +13,7 @@ use gtk4 as gtk; use nesemu::prelude::{EmulationState, HostConfig, RuntimeHostLoop}; use nesemu::{ FRAME_HEIGHT, FRAME_RGBA_BYTES, FRAME_WIDTH, FrameClock, InputProvider, JoypadButton, - JoypadButtons, NesRuntime, set_button_pressed, + JoypadButtons, NesRuntime, RingBuffer, set_button_pressed, }; const APP_ID: &str = "org.nesemu.desktop"; @@ -73,10 +75,33 @@ fn build_ui(app: >k::Application, initial_rom: Option) { .sensitive(false) .build(); + let volume = Arc::new(AtomicU32::new(f32::to_bits(0.75))); + + let volume_scale = gtk::Scale::with_range(gtk::Orientation::Horizontal, 0.0, 1.0, 0.05); + volume_scale.set_value(0.75); + volume_scale.set_draw_value(false); + volume_scale.set_width_request(100); + volume_scale.set_tooltip_text(Some("Volume")); + volume_scale.set_focusable(false); + + { + let volume = Arc::clone(&volume); + volume_scale.connect_value_changed(move |scale| { + let val = scale.value() as f32; + volume.store(f32::to_bits(val), AtomicOrdering::Relaxed); + }); + } + header.pack_start(&open_button); header.pack_start(&pause_button); header.pack_start(&reset_button); + let volume_box = gtk::Box::new(gtk::Orientation::Horizontal, 4); + let volume_icon = gtk::Image::from_icon_name("audio-volume-high-symbolic"); + volume_box.append(&volume_icon); + volume_box.append(&volume_scale); + header.pack_end(&volume_box); + window.set_titlebar(Some(&header)); // --- Drawing area --- @@ -99,7 +124,7 @@ fn build_ui(app: >k::Application, initial_rom: Option) { window.set_child(Some(&overlay)); // --- State --- - let desktop = Rc::new(RefCell::new(DesktopApp::new())); + let desktop = Rc::new(RefCell::new(DesktopApp::new(Arc::clone(&volume)))); let frame_for_draw: Rc>> = Rc::new(RefCell::new(vec![0u8; FRAME_RGBA_BYTES])); @@ -409,14 +434,93 @@ impl InputProvider for InputState { } // --------------------------------------------------------------------------- -// Audio (stub) +// Audio (cpal backend) // --------------------------------------------------------------------------- -#[derive(Default)] -struct AudioSink; +struct CpalAudioSink { + _stream: Option, + ring: Arc, + _volume: Arc, +} -impl nesemu::AudioOutput for AudioSink { - fn push_samples(&mut self, _samples: &[f32]) {} +impl CpalAudioSink { + fn new(volume: Arc) -> Self { + let ring = Arc::new(RingBuffer::new(4096)); + let ring_for_cb = Arc::clone(&ring); + let vol_for_cb = Arc::clone(&volume); + let stream = Self::try_build_stream(ring_for_cb, vol_for_cb); + Self { + _stream: stream, + ring, + _volume: volume, + } + } + + fn try_build_stream( + ring: Arc, + volume: Arc, + ) -> Option { + use cpal::traits::{DeviceTrait, HostTrait, StreamTrait}; + + let host = cpal::default_host(); + let device = match host.default_output_device() { + Some(d) => d, + None => { + eprintln!("No audio output device found — running without sound"); + return None; + } + }; + + let config = cpal::StreamConfig { + channels: 1, + sample_rate: cpal::SampleRate(SAMPLE_RATE), + buffer_size: cpal::BufferSize::Default, + }; + + let stream = match device.build_output_stream( + &config, + move |data: &mut [f32], _: &cpal::OutputCallbackInfo| { + let read = ring.pop(data); + for sample in &mut data[read..] { + *sample = 0.0; + } + let vol = f32::from_bits(volume.load(AtomicOrdering::Relaxed)); + for sample in &mut data[..read] { + *sample *= vol; + } + }, + move |err| { + eprintln!("Audio stream error: {err}"); + }, + None, + ) { + Ok(s) => s, + Err(err) => { + eprintln!("Failed to build audio stream: {err} — running without sound"); + return None; + } + }; + + if let Err(err) = stream.play() { + eprintln!("Failed to start audio stream: {err} — running without sound"); + return None; + } + + Some(stream) + } + + /// Reset the ring buffer. Note: the cpal callback may still be calling + /// `pop()` concurrently; in practice this is benign — at worst a few stale + /// samples are played during the ROM load / reset transition. + fn clear(&self) { + self.ring.clear(); + } +} + +impl nesemu::AudioOutput for CpalAudioSink { + fn push_samples(&mut self, samples: &[f32]) { + self.ring.push(samples); + } } // --------------------------------------------------------------------------- @@ -426,17 +530,17 @@ impl nesemu::AudioOutput for AudioSink { struct DesktopApp { host: Option>>, input: InputState, - audio: AudioSink, + audio: CpalAudioSink, frame_rgba: Vec, state: EmulationState, } impl DesktopApp { - fn new() -> Self { + fn new(volume: Arc) -> Self { Self { host: None, input: InputState::default(), - audio: AudioSink, + audio: CpalAudioSink::new(volume), frame_rgba: vec![0; FRAME_RGBA_BYTES], state: EmulationState::Paused, } @@ -447,6 +551,7 @@ impl DesktopApp { let runtime = NesRuntime::from_rom_bytes(&data)?; let config = HostConfig::new(SAMPLE_RATE, false); self.host = Some(RuntimeHostLoop::with_config(runtime, config)); + self.audio.clear(); self.state = EmulationState::Running; Ok(()) } @@ -454,6 +559,7 @@ impl DesktopApp { fn reset(&mut self) { if let Some(host) = self.host.as_mut() { host.runtime_mut().reset(); + self.audio.clear(); self.state = EmulationState::Running; } }