mirror of
https://github.com/Psychotoxical/psysonic.git
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Psychotoxical
1383 lines
52 KiB
Rust
1383 lines
52 KiB
Rust
use std::io::Cursor;
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use std::sync::{Arc, Mutex};
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use std::sync::atomic::{AtomicBool, AtomicU32, AtomicU64, Ordering};
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use std::time::{Duration, Instant};
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use biquad::{Biquad, Coefficients, DirectForm2Transposed, ToHertz, Type as FilterType};
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use rodio::{Decoder, Sink, Source};
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use rodio::source::UniformSourceIterator;
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use serde::Serialize;
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use tauri::{AppHandle, Emitter, State};
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// ─── 10-Band Graphic Equalizer ────────────────────────────────────────────────
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const EQ_BANDS_HZ: [f32; 10] = [31.0, 62.0, 125.0, 250.0, 500.0, 1000.0, 2000.0, 4000.0, 8000.0, 16000.0];
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const EQ_Q: f32 = 1.41;
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const EQ_CHECK_INTERVAL: usize = 1024;
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struct EqSource<S: Source<Item = f32>> {
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inner: S,
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sample_rate: u32,
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channels: u16,
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gains: Arc<[AtomicU32; 10]>,
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enabled: Arc<AtomicBool>,
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filters: [[DirectForm2Transposed<f32>; 2]; 10],
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current_gains: [f32; 10],
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sample_counter: usize,
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channel_idx: usize,
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}
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impl<S: Source<Item = f32>> EqSource<S> {
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fn new(inner: S, gains: Arc<[AtomicU32; 10]>, enabled: Arc<AtomicBool>) -> Self {
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let sample_rate = inner.sample_rate();
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let channels = inner.channels();
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let filters = std::array::from_fn(|band| {
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let freq = EQ_BANDS_HZ[band].clamp(20.0, (sample_rate as f32 / 2.0) - 100.0);
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std::array::from_fn(|_| {
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let coeffs = Coefficients::<f32>::from_params(
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FilterType::PeakingEQ(0.0),
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(sample_rate as f32).hz(),
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freq.hz(),
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EQ_Q,
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).unwrap_or_else(|_| Coefficients::<f32>::from_params(
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FilterType::PeakingEQ(0.0),
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(sample_rate as f32).hz(),
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1000.0f32.hz(),
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EQ_Q,
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).unwrap());
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DirectForm2Transposed::<f32>::new(coeffs)
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})
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});
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Self {
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inner, sample_rate, channels, gains, enabled,
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filters,
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current_gains: [0.0; 10],
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sample_counter: 0,
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channel_idx: 0,
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}
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}
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fn refresh_if_needed(&mut self) {
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for band in 0..10 {
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let gain_db = f32::from_bits(self.gains[band].load(Ordering::Relaxed));
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if (gain_db - self.current_gains[band]).abs() > 0.01 {
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self.current_gains[band] = gain_db;
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let freq = EQ_BANDS_HZ[band].clamp(20.0, (self.sample_rate as f32 / 2.0) - 100.0);
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if let Ok(coeffs) = Coefficients::<f32>::from_params(
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FilterType::PeakingEQ(gain_db),
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(self.sample_rate as f32).hz(),
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freq.hz(),
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EQ_Q,
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) {
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for ch in 0..2 {
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self.filters[band][ch].update_coefficients(coeffs);
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}
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}
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}
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}
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}
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}
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impl<S: Source<Item = f32>> Iterator for EqSource<S> {
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type Item = f32;
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fn next(&mut self) -> Option<f32> {
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let sample = self.inner.next()?;
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if self.sample_counter % EQ_CHECK_INTERVAL == 0 {
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self.refresh_if_needed();
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}
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self.sample_counter = self.sample_counter.wrapping_add(1);
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if !self.enabled.load(Ordering::Relaxed) {
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self.channel_idx = (self.channel_idx + 1) % self.channels as usize;
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return Some(sample);
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}
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let ch = self.channel_idx.min(1);
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self.channel_idx = (self.channel_idx + 1) % self.channels as usize;
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let mut s = sample;
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for band in 0..10 {
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s = self.filters[band][ch].run(s);
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}
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Some(s.clamp(-1.0, 1.0))
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}
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}
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impl<S: Source<Item = f32>> Source for EqSource<S> {
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fn current_frame_len(&self) -> Option<usize> { self.inner.current_frame_len() }
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fn channels(&self) -> u16 { self.channels }
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fn sample_rate(&self) -> u32 { self.sample_rate }
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fn total_duration(&self) -> Option<Duration> { self.inner.total_duration() }
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fn try_seek(&mut self, pos: Duration) -> Result<(), rodio::source::SeekError> {
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// Reset biquad filter state to avoid glitches after seek.
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for band in 0..10 {
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let gain_db = f32::from_bits(self.gains[band].load(Ordering::Relaxed));
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self.current_gains[band] = gain_db;
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let freq = EQ_BANDS_HZ[band].clamp(20.0, (self.sample_rate as f32 / 2.0) - 100.0);
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if let Ok(coeffs) = Coefficients::<f32>::from_params(
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FilterType::PeakingEQ(gain_db),
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(self.sample_rate as f32).hz(),
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freq.hz(),
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EQ_Q,
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) {
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for ch in 0..2 {
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self.filters[band][ch] = DirectForm2Transposed::<f32>::new(coeffs);
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}
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}
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}
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self.channel_idx = 0;
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self.sample_counter = 0;
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self.inner.try_seek(pos)
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}
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}
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// ─── DynSource — type-erased Source wrapper ───────────────────────────────────
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//
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// Allows chaining differently-typed sources (with trimming applied) into a
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// single concrete type accepted by EqSource<S: Source<Item=f32>>.
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struct DynSource {
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inner: Box<dyn Source<Item = f32> + Send>,
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channels: u16,
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sample_rate: u32,
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}
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impl DynSource {
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fn new(src: impl Source<Item = f32> + Send + 'static) -> Self {
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let channels = src.channels();
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let sample_rate = src.sample_rate();
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Self { inner: Box::new(src), channels, sample_rate }
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}
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}
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impl Iterator for DynSource {
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type Item = f32;
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fn next(&mut self) -> Option<f32> { self.inner.next() }
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}
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impl Source for DynSource {
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fn current_frame_len(&self) -> Option<usize> { self.inner.current_frame_len() }
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fn channels(&self) -> u16 { self.channels }
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fn sample_rate(&self) -> u32 { self.sample_rate }
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fn total_duration(&self) -> Option<Duration> { self.inner.total_duration() }
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fn try_seek(&mut self, pos: Duration) -> Result<(), rodio::source::SeekError> {
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self.inner.try_seek(pos)
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}
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}
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// ─── EqualPowerFadeIn — per-sample sin(t·π/2) fade-in envelope ───────────────
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//
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// Applied to every new track:
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// • Crossfade: fade_dur = crossfade_secs → symmetric equal-power fade-in
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// • Hard cut: fade_dur = 5 ms → micro-fade eliminates DC-click
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// • Gapless: fade_dur = 0 → unity gain (no modification)
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//
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// gain(t) = sin(t · π/2), t ∈ [0, 1)
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// At t = 0 gain = 0, at t = 1 gain = 1.
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// Equal-power property: cos²+sin² = 1 → combined with cos fade-out on Track A
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// the total perceived loudness stays constant across the crossfade.
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struct EqualPowerFadeIn<S: Source<Item = f32>> {
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inner: S,
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sample_count: u64,
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fade_samples: u64,
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}
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impl<S: Source<Item = f32>> EqualPowerFadeIn<S> {
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fn new(inner: S, fade_dur: Duration) -> Self {
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let sample_rate = inner.sample_rate();
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let channels = inner.channels() as u64;
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let fade_samples = if fade_dur.is_zero() {
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0
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} else {
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(fade_dur.as_secs_f64() * sample_rate as f64 * channels as f64) as u64
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};
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Self { inner, sample_count: 0, fade_samples }
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}
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}
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impl<S: Source<Item = f32>> Iterator for EqualPowerFadeIn<S> {
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type Item = f32;
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fn next(&mut self) -> Option<f32> {
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let sample = self.inner.next()?;
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let gain = if self.fade_samples == 0 || self.sample_count >= self.fade_samples {
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1.0
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} else {
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let t = self.sample_count as f32 / self.fade_samples as f32;
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(t * std::f32::consts::FRAC_PI_2).sin()
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};
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self.sample_count += 1;
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Some((sample * gain).clamp(-1.0, 1.0))
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}
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}
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impl<S: Source<Item = f32>> Source for EqualPowerFadeIn<S> {
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fn current_frame_len(&self) -> Option<usize> { self.inner.current_frame_len() }
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fn channels(&self) -> u16 { self.inner.channels() }
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fn sample_rate(&self) -> u32 { self.inner.sample_rate() }
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fn total_duration(&self) -> Option<Duration> { self.inner.total_duration() }
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fn try_seek(&mut self, pos: Duration) -> Result<(), rodio::source::SeekError> {
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// Restart the fade envelope after seeking (avoids a mid-song click if
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// the user seeks to the very beginning while a fade was in progress).
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self.sample_count = 0;
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self.inner.try_seek(pos)
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}
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}
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// ─── TriggeredFadeOut — sample-level cos(t·π/2) fade-out triggered externally ─
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//
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// Every track source is wrapped with this. It passes through at unity gain
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// until `trigger` is set to true, at which point it reads `fade_total_samples`
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// and applies a cos(t·π/2) envelope:
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// gain(t) = cos(t · π/2), t ∈ [0, 1]
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// At t = 0 gain = 1, at t = 1 gain = 0.
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// After the fade completes, returns None to exhaust the source.
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//
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// Combined with EqualPowerFadeIn (sin curve) on Track B, this gives a
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// symmetric constant-power crossfade: sin²+cos² = 1.
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struct TriggeredFadeOut<S: Source<Item = f32>> {
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inner: S,
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trigger: Arc<AtomicBool>,
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fade_total_samples: Arc<AtomicU64>,
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fade_progress: u64,
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fading: bool,
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cached_total: u64,
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}
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impl<S: Source<Item = f32>> TriggeredFadeOut<S> {
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fn new(inner: S, trigger: Arc<AtomicBool>, fade_total_samples: Arc<AtomicU64>) -> Self {
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Self {
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inner,
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trigger,
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fade_total_samples,
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fade_progress: 0,
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fading: false,
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cached_total: 0,
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}
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}
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}
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impl<S: Source<Item = f32>> Iterator for TriggeredFadeOut<S> {
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type Item = f32;
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fn next(&mut self) -> Option<f32> {
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// Check trigger on first fade sample only (avoid atomic load per sample).
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if !self.fading && self.trigger.load(Ordering::Relaxed) {
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self.fading = true;
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self.cached_total = self.fade_total_samples.load(Ordering::Relaxed).max(1);
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self.fade_progress = 0;
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}
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if self.fading {
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if self.fade_progress >= self.cached_total {
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// Fade complete — exhaust the source.
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return None;
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}
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let sample = self.inner.next()?;
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let t = self.fade_progress as f32 / self.cached_total as f32;
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let gain = (t * std::f32::consts::FRAC_PI_2).cos();
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self.fade_progress += 1;
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Some((sample * gain).clamp(-1.0, 1.0))
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} else {
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self.inner.next()
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}
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}
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}
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impl<S: Source<Item = f32>> Source for TriggeredFadeOut<S> {
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fn current_frame_len(&self) -> Option<usize> { self.inner.current_frame_len() }
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fn channels(&self) -> u16 { self.inner.channels() }
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fn sample_rate(&self) -> u32 { self.inner.sample_rate() }
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fn total_duration(&self) -> Option<Duration> { self.inner.total_duration() }
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fn try_seek(&mut self, pos: Duration) -> Result<(), rodio::source::SeekError> {
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// If we seek back during a fade, cancel the fade.
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if self.fading {
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self.fading = false;
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self.trigger.store(false, Ordering::Relaxed);
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}
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self.fade_progress = 0;
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self.inner.try_seek(pos)
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}
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}
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// ─── NotifyingSource — sets a flag when the inner iterator is exhausted ───────
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//
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// This is the key mechanism for gapless: the progress task polls `done` to know
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// exactly when source N has finished inside the Sink, without relying on
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// wall-clock estimation or the unreliable `Sink::empty()`.
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struct NotifyingSource<S: Source<Item = f32>> {
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inner: S,
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done: Arc<AtomicBool>,
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signalled: bool,
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}
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impl<S: Source<Item = f32>> NotifyingSource<S> {
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fn new(inner: S, done: Arc<AtomicBool>) -> Self {
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Self { inner, done, signalled: false }
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}
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}
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impl<S: Source<Item = f32>> Iterator for NotifyingSource<S> {
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type Item = f32;
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fn next(&mut self) -> Option<f32> {
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let sample = self.inner.next();
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if sample.is_none() && !self.signalled {
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self.signalled = true;
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self.done.store(true, Ordering::SeqCst);
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}
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sample
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}
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}
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impl<S: Source<Item = f32>> Source for NotifyingSource<S> {
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fn current_frame_len(&self) -> Option<usize> { self.inner.current_frame_len() }
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fn channels(&self) -> u16 { self.inner.channels() }
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fn sample_rate(&self) -> u32 { self.inner.sample_rate() }
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fn total_duration(&self) -> Option<Duration> { self.inner.total_duration() }
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fn try_seek(&mut self, pos: Duration) -> Result<(), rodio::source::SeekError> {
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// If we seek backwards the source is no longer exhausted.
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self.signalled = false;
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self.done.store(false, Ordering::SeqCst);
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self.inner.try_seek(pos)
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}
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}
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// ─── CountingSource — atomic sample counter for drift-free position tracking ─
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//
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// Wraps the outermost source and increments a shared AtomicU64 on every sample.
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// The progress task reads this counter and divides by (sample_rate * channels)
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// to get the exact playback position — no wall-clock drift.
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struct CountingSource<S: Source<Item = f32>> {
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inner: S,
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counter: Arc<AtomicU64>,
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}
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impl<S: Source<Item = f32>> CountingSource<S> {
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fn new(inner: S, counter: Arc<AtomicU64>) -> Self {
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Self { inner, counter }
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}
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}
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impl<S: Source<Item = f32>> Iterator for CountingSource<S> {
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type Item = f32;
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fn next(&mut self) -> Option<f32> {
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let sample = self.inner.next();
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if sample.is_some() {
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self.counter.fetch_add(1, Ordering::Relaxed);
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}
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sample
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}
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}
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impl<S: Source<Item = f32>> Source for CountingSource<S> {
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fn current_frame_len(&self) -> Option<usize> { self.inner.current_frame_len() }
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fn channels(&self) -> u16 { self.inner.channels() }
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fn sample_rate(&self) -> u32 { self.inner.sample_rate() }
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fn total_duration(&self) -> Option<Duration> { self.inner.total_duration() }
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fn try_seek(&mut self, pos: Duration) -> Result<(), rodio::source::SeekError> {
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// Reset counter only after confirming the inner seek succeeded.
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// If we reset first and the seek fails, the counter ends up at the
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// new position while the decoder is still at the old one — causing
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// a permanent desync between displayed time and actual audio.
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let result = self.inner.try_seek(pos);
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if result.is_ok() {
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let samples = (pos.as_secs_f64() * self.inner.sample_rate() as f64
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* self.inner.channels() as f64) as u64;
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self.counter.store(samples, Ordering::Relaxed);
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}
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result
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}
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}
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// ─── Encoder-gap trimming (iTunSMPB) ─────────────────────────────────────────
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//
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// MP3/AAC encoders prepend an "encoder delay" (typically 576–2112 silent
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// samples for LAME) and append end-padding to fill the final frame.
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// iTunes embeds the exact counts in an ID3v2 COMM frame with description
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// "iTunSMPB". Format: " 00000000 DELAY PADDING TOTAL ..." (space-separated hex)
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//
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// Parsing strategy: scan raw bytes for the ASCII marker, then extract the
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// first whitespace-separated hex tokens after it.
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struct GaplessInfo {
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delay_samples: u64,
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total_valid_samples: Option<u64>,
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}
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impl Default for GaplessInfo {
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fn default() -> Self {
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Self { delay_samples: 0, total_valid_samples: None }
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}
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}
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fn find_subsequence(data: &[u8], needle: &[u8]) -> Option<usize> {
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data.windows(needle.len()).position(|w| w == needle)
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}
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fn parse_gapless_info(data: &[u8]) -> GaplessInfo {
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let pos = match find_subsequence(data, b"iTunSMPB") {
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Some(p) => p,
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None => return GaplessInfo::default(),
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};
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// Collect printable ASCII bytes after the tag (skip nulls / control chars)
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let tail = &data[pos + 8..data.len().min(pos + 8 + 256)];
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let text: String = tail.iter()
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.map(|&b| b as char)
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.filter(|c| c.is_ascii_hexdigit() || *c == ' ')
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.collect();
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let parts: Vec<&str> = text.split_whitespace().collect();
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// parts[0] = "00000000", parts[1] = delay, parts[2] = padding, parts[3] = total
|
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if parts.len() < 3 {
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return GaplessInfo::default();
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}
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let delay = u64::from_str_radix(parts.get(1).unwrap_or(&"0"), 16).unwrap_or(0);
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let padding = u64::from_str_radix(parts.get(2).unwrap_or(&"0"), 16).unwrap_or(0);
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let total_raw = parts.get(3).and_then(|s| u64::from_str_radix(s, 16).ok());
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let total_valid = total_raw.map(|t| t).filter(|&t| t > 0).or_else(|| {
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// Derive from delay + padding if total not available:
|
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// Not possible without knowing total encoded samples, so just use None.
|
||
let _ = padding;
|
||
None
|
||
});
|
||
|
||
GaplessInfo { delay_samples: delay, total_valid_samples: total_valid }
|
||
}
|
||
|
||
/// Result of build_source: the fully-wrapped source plus metadata and control Arcs.
|
||
struct BuiltSource {
|
||
source: CountingSource<NotifyingSource<TriggeredFadeOut<EqualPowerFadeIn<EqSource<DynSource>>>>>,
|
||
duration_secs: f64,
|
||
output_rate: u32,
|
||
output_channels: u16,
|
||
/// Trigger for the sample-level crossfade fade-out.
|
||
fadeout_trigger: Arc<AtomicBool>,
|
||
/// Total samples for the fade-out (set before triggering).
|
||
fadeout_samples: Arc<AtomicU64>,
|
||
}
|
||
|
||
/// Build a fully-prepared playback source:
|
||
/// decode → trim → resample → EQ → fade-in → triggered-fade-out → notify → count
|
||
///
|
||
/// `fade_in_dur`:
|
||
/// • `Duration::ZERO` — unity gain; used for gapless chain (no click)
|
||
/// • `Duration::from_millis(5)` — micro-fade; used for hard cuts (anti-click)
|
||
/// • `Duration::from_secs_f32(cf)` — full equal-power fade-in for crossfade
|
||
///
|
||
/// `sample_counter`: atomic counter incremented per sample for drift-free position.
|
||
/// `target_rate`: canonical output sample rate for resampling (0 = no resampling).
|
||
fn build_source(
|
||
data: Vec<u8>,
|
||
duration_hint: f64,
|
||
eq_gains: Arc<[AtomicU32; 10]>,
|
||
eq_enabled: Arc<AtomicBool>,
|
||
done_flag: Arc<AtomicBool>,
|
||
fade_in_dur: Duration,
|
||
sample_counter: Arc<AtomicU64>,
|
||
target_rate: u32,
|
||
) -> Result<BuiltSource, String> {
|
||
let gapless = parse_gapless_info(&data);
|
||
|
||
let cursor = Cursor::new(data);
|
||
let decoder = Decoder::new(cursor).map_err(|e| e.to_string())?;
|
||
let sample_rate = decoder.sample_rate();
|
||
let channels = decoder.channels();
|
||
|
||
// Determine effective duration.
|
||
// Prefer hint from Subsonic API (reliable) over decoder (unreliable for VBR MP3).
|
||
let effective_dur = if duration_hint > 1.0 {
|
||
duration_hint
|
||
} else {
|
||
decoder.total_duration()
|
||
.map(|d| d.as_secs_f64())
|
||
.unwrap_or(duration_hint)
|
||
};
|
||
|
||
// Apply encoder-delay trim and optional end-padding trim,
|
||
// then resample to the canonical target rate if needed.
|
||
let dyn_src: DynSource = if gapless.delay_samples > 0 || gapless.total_valid_samples.is_some() {
|
||
let delay_dur = Duration::from_secs_f64(
|
||
gapless.delay_samples as f64 / sample_rate as f64
|
||
);
|
||
let base = decoder.convert_samples::<f32>().skip_duration(delay_dur);
|
||
|
||
if let Some(total) = gapless.total_valid_samples {
|
||
let valid_dur = Duration::from_secs_f64(total as f64 / sample_rate as f64);
|
||
let trimmed = base.take_duration(valid_dur);
|
||
if target_rate > 0 && sample_rate != target_rate {
|
||
DynSource::new(UniformSourceIterator::new(trimmed, channels, target_rate))
|
||
} else {
|
||
DynSource::new(trimmed)
|
||
}
|
||
} else {
|
||
if target_rate > 0 && sample_rate != target_rate {
|
||
DynSource::new(UniformSourceIterator::new(base, channels, target_rate))
|
||
} else {
|
||
DynSource::new(base)
|
||
}
|
||
}
|
||
} else {
|
||
let converted = decoder.convert_samples::<f32>();
|
||
if target_rate > 0 && sample_rate != target_rate {
|
||
DynSource::new(UniformSourceIterator::new(converted, channels, target_rate))
|
||
} else {
|
||
DynSource::new(converted)
|
||
}
|
||
};
|
||
|
||
let output_rate = if target_rate > 0 && sample_rate != target_rate { target_rate } else { sample_rate };
|
||
|
||
let fadeout_trigger = Arc::new(AtomicBool::new(false));
|
||
let fadeout_samples = Arc::new(AtomicU64::new(0));
|
||
|
||
let eq_src = EqSource::new(dyn_src, eq_gains, eq_enabled);
|
||
let fade_in = EqualPowerFadeIn::new(eq_src, fade_in_dur);
|
||
let fade_out = TriggeredFadeOut::new(fade_in, fadeout_trigger.clone(), fadeout_samples.clone());
|
||
let notifying = NotifyingSource::new(fade_out, done_flag);
|
||
let counting = CountingSource::new(notifying, sample_counter);
|
||
|
||
Ok(BuiltSource {
|
||
source: counting,
|
||
duration_secs: effective_dur,
|
||
output_rate,
|
||
output_channels: channels,
|
||
fadeout_trigger,
|
||
fadeout_samples,
|
||
})
|
||
}
|
||
|
||
// ─── Engine state ─────────────────────────────────────────────────────────────
|
||
|
||
pub(crate) struct PreloadedTrack {
|
||
url: String,
|
||
data: Vec<u8>,
|
||
}
|
||
|
||
/// Info about the track that has been appended (chained) to the current Sink
|
||
/// but whose source has not yet started playing (gapless mode only).
|
||
pub(crate) struct ChainedInfo {
|
||
/// The URL that was chained — used by audio_play to detect a pre-chain hit.
|
||
url: String,
|
||
duration_secs: f64,
|
||
replay_gain_linear: f32,
|
||
base_volume: f32,
|
||
/// Set by NotifyingSource when this chained track's source is exhausted.
|
||
source_done: Arc<AtomicBool>,
|
||
/// Atomic sample counter for this chained source (swapped into
|
||
/// samples_played on transition).
|
||
sample_counter: Arc<AtomicU64>,
|
||
}
|
||
|
||
pub struct AudioEngine {
|
||
pub stream_handle: Arc<rodio::OutputStreamHandle>,
|
||
pub current: Arc<Mutex<AudioCurrent>>,
|
||
/// Monotonically incremented on each audio_play (non-chain) / audio_stop call.
|
||
pub generation: Arc<AtomicU64>,
|
||
pub http_client: reqwest::Client,
|
||
pub eq_gains: Arc<[AtomicU32; 10]>,
|
||
pub eq_enabled: Arc<AtomicBool>,
|
||
pub preloaded: Arc<Mutex<Option<PreloadedTrack>>>,
|
||
pub crossfade_enabled: Arc<AtomicBool>,
|
||
pub crossfade_secs: Arc<AtomicU32>,
|
||
pub fading_out_sink: Arc<Mutex<Option<Sink>>>,
|
||
/// When true, audio_play chains sources to the existing Sink instead of
|
||
/// creating a new one, achieving sample-accurate gapless transitions.
|
||
pub gapless_enabled: Arc<AtomicBool>,
|
||
/// Info about the next-up chained track (gapless mode).
|
||
/// The progress task reads this when `current_source_done` fires.
|
||
pub chained_info: Arc<Mutex<Option<ChainedInfo>>>,
|
||
/// Atomic sample counter — incremented by CountingSource in the audio thread.
|
||
/// Progress task reads this for drift-free position tracking.
|
||
pub samples_played: Arc<AtomicU64>,
|
||
/// Sample rate of the currently playing source (for samples → seconds).
|
||
pub current_sample_rate: Arc<AtomicU32>,
|
||
/// Channel count of the currently playing source.
|
||
pub current_channels: Arc<AtomicU32>,
|
||
/// Instant (as nanos since UNIX epoch via Instant hack) of the last gapless
|
||
/// auto-advance. Commands arriving within 500 ms are rejected as ghost commands.
|
||
pub gapless_switch_at: Arc<AtomicU64>,
|
||
}
|
||
|
||
pub struct AudioCurrent {
|
||
pub sink: Option<Sink>,
|
||
pub duration_secs: f64,
|
||
pub seek_offset: f64,
|
||
pub play_started: Option<Instant>,
|
||
pub paused_at: Option<f64>,
|
||
pub replay_gain_linear: f32,
|
||
pub base_volume: f32,
|
||
/// Crossfade: trigger for sample-level fade-out of the current source.
|
||
pub fadeout_trigger: Option<Arc<AtomicBool>>,
|
||
/// Crossfade: total fade samples (set before triggering).
|
||
pub fadeout_samples: Option<Arc<AtomicU64>>,
|
||
}
|
||
|
||
impl AudioCurrent {
|
||
pub fn position(&self) -> f64 {
|
||
if let Some(p) = self.paused_at {
|
||
return p;
|
||
}
|
||
if let Some(t) = self.play_started {
|
||
let elapsed = t.elapsed().as_secs_f64();
|
||
(self.seek_offset + elapsed).min(self.duration_secs.max(0.001))
|
||
} else {
|
||
self.seek_offset
|
||
}
|
||
}
|
||
}
|
||
|
||
pub fn create_engine() -> (AudioEngine, std::thread::JoinHandle<()>) {
|
||
let (tx, rx) = std::sync::mpsc::sync_channel::<rodio::OutputStreamHandle>(0);
|
||
|
||
// Request a larger audio buffer from PipeWire/PulseAudio to reduce ALSA underruns.
|
||
// Only set if the user hasn't already configured these themselves.
|
||
// PIPEWIRE_LATENCY: 4096 frames / 48000 Hz ≈ 85 ms — enough to absorb scheduler jitter.
|
||
#[cfg(target_os = "linux")]
|
||
{
|
||
if std::env::var("PIPEWIRE_LATENCY").is_err() {
|
||
std::env::set_var("PIPEWIRE_LATENCY", "4096/48000");
|
||
}
|
||
if std::env::var("PULSE_LATENCY_MSEC").is_err() {
|
||
std::env::set_var("PULSE_LATENCY_MSEC", "85");
|
||
}
|
||
}
|
||
|
||
// macOS: request a smaller CoreAudio buffer to reduce output latency.
|
||
// Smaller buffers = lower latency between decoded samples and DAC output,
|
||
// which tightens the gap between actual audio and UI event delivery.
|
||
#[cfg(target_os = "macos")]
|
||
{
|
||
if std::env::var("COREAUDIO_BUFFER_SIZE").is_err() {
|
||
std::env::set_var("COREAUDIO_BUFFER_SIZE", "512");
|
||
}
|
||
}
|
||
|
||
let thread = std::thread::Builder::new()
|
||
.name("psysonic-audio-stream".into())
|
||
.spawn(move || match rodio::OutputStream::try_default() {
|
||
Ok((_stream, handle)) => {
|
||
tx.send(handle).ok();
|
||
loop { std::thread::park(); }
|
||
}
|
||
Err(e) => { eprintln!("[psysonic] audio output error: {e}"); }
|
||
})
|
||
.expect("spawn audio stream thread");
|
||
|
||
let stream_handle = rx.recv().expect("audio stream handle");
|
||
|
||
let engine = AudioEngine {
|
||
stream_handle: Arc::new(stream_handle),
|
||
current: Arc::new(Mutex::new(AudioCurrent {
|
||
sink: None,
|
||
duration_secs: 0.0,
|
||
seek_offset: 0.0,
|
||
play_started: None,
|
||
paused_at: None,
|
||
replay_gain_linear: 1.0,
|
||
base_volume: 0.8,
|
||
fadeout_trigger: None,
|
||
fadeout_samples: None,
|
||
})),
|
||
generation: Arc::new(AtomicU64::new(0)),
|
||
http_client: reqwest::Client::builder()
|
||
.timeout(Duration::from_secs(30))
|
||
.build()
|
||
.unwrap_or_default(),
|
||
eq_gains: Arc::new(std::array::from_fn(|_| AtomicU32::new(0f32.to_bits()))),
|
||
eq_enabled: Arc::new(AtomicBool::new(false)),
|
||
preloaded: Arc::new(Mutex::new(None)),
|
||
crossfade_enabled: Arc::new(AtomicBool::new(false)),
|
||
crossfade_secs: Arc::new(AtomicU32::new(3.0f32.to_bits())),
|
||
fading_out_sink: Arc::new(Mutex::new(None)),
|
||
gapless_enabled: Arc::new(AtomicBool::new(false)),
|
||
chained_info: Arc::new(Mutex::new(None)),
|
||
samples_played: Arc::new(AtomicU64::new(0)),
|
||
current_sample_rate: Arc::new(AtomicU32::new(44100)),
|
||
current_channels: Arc::new(AtomicU32::new(2)),
|
||
gapless_switch_at: Arc::new(AtomicU64::new(0)),
|
||
};
|
||
|
||
(engine, thread)
|
||
}
|
||
|
||
// ─── Event payloads ───────────────────────────────────────────────────────────
|
||
|
||
#[derive(Clone, Serialize)]
|
||
pub struct ProgressPayload {
|
||
pub current_time: f64,
|
||
pub duration: f64,
|
||
}
|
||
|
||
// ─── Helpers ──────────────────────────────────────────────────────────────────
|
||
|
||
/// Fetch track bytes from the preload cache or via HTTP.
|
||
async fn fetch_data(
|
||
url: &str,
|
||
state: &AudioEngine,
|
||
gen: u64,
|
||
app: &AppHandle,
|
||
) -> Result<Option<Vec<u8>>, String> {
|
||
// Check preload cache first.
|
||
let cached = {
|
||
let mut preloaded = state.preloaded.lock().unwrap();
|
||
if preloaded.as_ref().map(|p| p.url == url).unwrap_or(false) {
|
||
preloaded.take().map(|p| p.data)
|
||
} else {
|
||
None
|
||
}
|
||
};
|
||
|
||
if let Some(data) = cached {
|
||
return Ok(Some(data));
|
||
}
|
||
|
||
// Offline cache — local file written by download_track_offline.
|
||
if let Some(path) = url.strip_prefix("psysonic-local://") {
|
||
let data = tokio::fs::read(path).await.map_err(|e| e.to_string())?;
|
||
return Ok(Some(data));
|
||
}
|
||
|
||
let response = state.http_client.get(url).send().await.map_err(|e| e.to_string())?;
|
||
if !response.status().is_success() {
|
||
if state.generation.load(Ordering::SeqCst) != gen {
|
||
return Ok(None); // superseded
|
||
}
|
||
let status = response.status().as_u16();
|
||
let msg = format!("HTTP {status}");
|
||
app.emit("audio:error", &msg).ok();
|
||
return Err(msg);
|
||
}
|
||
let data: Vec<u8> = response.bytes().await.map_err(|e| e.to_string())?.into();
|
||
Ok(Some(data))
|
||
}
|
||
|
||
/// -1 dB headroom applied at full scale to prevent inter-sample clipping.
|
||
/// Modern masters are often at 0 dBFS; the EQ biquad chain and resampler
|
||
/// can produce inter-sample peaks slightly above ±1.0 → audible distortion.
|
||
/// 10^(-1/20) ≈ 0.891 — inaudible volume difference, eliminates clipping.
|
||
const MASTER_HEADROOM: f32 = 0.891_254;
|
||
|
||
fn compute_gain(
|
||
replay_gain_db: Option<f32>,
|
||
replay_gain_peak: Option<f32>,
|
||
volume: f32,
|
||
) -> (f32, f32) {
|
||
let gain_linear = replay_gain_db
|
||
.map(|db| 10f32.powf(db / 20.0))
|
||
.unwrap_or(1.0);
|
||
let peak = replay_gain_peak.unwrap_or(1.0).max(0.001);
|
||
let gain_linear = gain_linear.min(1.0 / peak);
|
||
let effective = (volume.clamp(0.0, 1.0) * gain_linear * MASTER_HEADROOM).clamp(0.0, 1.0);
|
||
(gain_linear, effective)
|
||
}
|
||
|
||
// ─── Commands ─────────────────────────────────────────────────────────────────
|
||
|
||
#[tauri::command]
|
||
pub async fn audio_play(
|
||
url: String,
|
||
volume: f32,
|
||
duration_hint: f64,
|
||
replay_gain_db: Option<f32>,
|
||
replay_gain_peak: Option<f32>,
|
||
app: AppHandle,
|
||
state: State<'_, AudioEngine>,
|
||
) -> Result<(), String> {
|
||
let gapless = state.gapless_enabled.load(Ordering::Relaxed);
|
||
|
||
// ── Ghost-command guard ───────────────────────────────────────────────────
|
||
// After a gapless auto-advance, the frontend may fire a stale playTrack()
|
||
// call via IPC. If we're within 500 ms of the last gapless switch AND the
|
||
// requested URL matches the already-playing chained track, reject it.
|
||
{
|
||
let switch_ms = state.gapless_switch_at.load(Ordering::SeqCst);
|
||
if switch_ms > 0 {
|
||
let now_ms = std::time::SystemTime::now()
|
||
.duration_since(std::time::UNIX_EPOCH)
|
||
.unwrap_or_default()
|
||
.as_millis() as u64;
|
||
if now_ms.saturating_sub(switch_ms) < 500 {
|
||
// Within the guard window — suppress this ghost command.
|
||
return Ok(());
|
||
}
|
||
}
|
||
}
|
||
|
||
// ── Gapless pre-chain hit ─────────────────────────────────────────────────
|
||
// audio_chain_preload already appended this URL to the Sink 30 s in
|
||
// advance. The source is live in the queue — just return and let the
|
||
// progress task handle the state transition when the previous source ends.
|
||
if gapless {
|
||
let already_chained = state.chained_info.lock().unwrap()
|
||
.as_ref()
|
||
.map(|c| c.url == url)
|
||
.unwrap_or(false);
|
||
if already_chained {
|
||
return Ok(());
|
||
}
|
||
}
|
||
|
||
// ── Standard (new-sink) path ─────────────────────────────────────────────
|
||
// Used for: manual skip, gapless OFF, first play, or gapless when the
|
||
// proactive chain was not set up in time.
|
||
|
||
let gen = state.generation.fetch_add(1, Ordering::SeqCst) + 1;
|
||
|
||
// Cancel any pending chain (manual skip while gapless chain was set up).
|
||
*state.chained_info.lock().unwrap() = None;
|
||
|
||
// Stop fading-out sink from previous crossfade.
|
||
if let Some(old) = state.fading_out_sink.lock().unwrap().take() {
|
||
old.stop();
|
||
}
|
||
|
||
// Fetch bytes (may use preload cache).
|
||
let data = match fetch_data(&url, &state, gen, &app).await? {
|
||
Some(d) => d,
|
||
None => return Ok(()), // superseded while downloading
|
||
};
|
||
|
||
if state.generation.load(Ordering::SeqCst) != gen {
|
||
return Ok(());
|
||
}
|
||
|
||
let (gain_linear, effective_volume) = compute_gain(replay_gain_db, replay_gain_peak, volume);
|
||
|
||
let crossfade_enabled = state.crossfade_enabled.load(Ordering::Relaxed);
|
||
let crossfade_secs_val = f32::from_bits(state.crossfade_secs.load(Ordering::Relaxed)).clamp(0.5, 12.0);
|
||
|
||
// Measure how much audio Track A actually has left right now.
|
||
// By the time audio_play is called, near_end_ticks (2×500ms) + IPC latency
|
||
// have consumed ~500–800ms from Track A's tail — so its true remaining time
|
||
// is always less than crossfade_secs_val. Using the measured remaining time
|
||
// for BOTH fade-out (Track A) and fade-in (Track B) keeps them in sync and
|
||
// guarantees Track A reaches 0 exactly when its source exhausts.
|
||
let actual_fade_secs: f32 = if crossfade_enabled {
|
||
let cur = state.current.lock().unwrap();
|
||
let remaining = (cur.duration_secs - cur.position()) as f32;
|
||
remaining.clamp(0.1, crossfade_secs_val)
|
||
} else {
|
||
0.0
|
||
};
|
||
|
||
// Fade-in duration for Track B:
|
||
// crossfade → equal-power sin(t·π/2) over actual remaining time of Track A
|
||
// hard cut → 5 ms micro-fade to suppress DC-offset click
|
||
let fade_in_dur = if crossfade_enabled {
|
||
Duration::from_secs_f32(actual_fade_secs)
|
||
} else {
|
||
Duration::from_millis(5)
|
||
};
|
||
|
||
// Build source: decode → trim → resample → EQ → fade-in → fade-out → notify → count.
|
||
let done_flag = Arc::new(AtomicBool::new(false));
|
||
// Reset sample counter for the new track.
|
||
state.samples_played.store(0, Ordering::Relaxed);
|
||
let target_rate = state.current_sample_rate.load(Ordering::Relaxed);
|
||
let built = build_source(
|
||
data,
|
||
duration_hint,
|
||
state.eq_gains.clone(),
|
||
state.eq_enabled.clone(),
|
||
done_flag.clone(),
|
||
fade_in_dur,
|
||
state.samples_played.clone(),
|
||
target_rate,
|
||
).map_err(|e| { app.emit("audio:error", &e).ok(); e })?;
|
||
let source = built.source;
|
||
let duration_secs = built.duration_secs;
|
||
let output_rate = built.output_rate;
|
||
let output_channels = built.output_channels;
|
||
|
||
// Store the actual output rate/channels for position calculation.
|
||
state.current_sample_rate.store(output_rate, Ordering::Relaxed);
|
||
state.current_channels.store(output_channels as u32, Ordering::Relaxed);
|
||
|
||
if state.generation.load(Ordering::SeqCst) != gen {
|
||
return Ok(());
|
||
}
|
||
|
||
let sink = Sink::try_new(&*state.stream_handle).map_err(|e| e.to_string())?;
|
||
sink.set_volume(effective_volume);
|
||
|
||
// Gapless OFF: prepend a short silence so tracks are clearly separated.
|
||
// Only when this is an auto-advance (near end), not on manual skip.
|
||
if !gapless {
|
||
let cur_pos = {
|
||
let cur = state.current.lock().unwrap();
|
||
cur.position()
|
||
};
|
||
let cur_dur = {
|
||
let cur = state.current.lock().unwrap();
|
||
cur.duration_secs
|
||
};
|
||
let is_auto_advance = cur_dur > 3.0 && cur_pos >= cur_dur - 3.0;
|
||
if is_auto_advance {
|
||
let silence = rodio::source::Zero::<f32>::new(
|
||
source.channels(),
|
||
source.sample_rate(),
|
||
).take_duration(Duration::from_millis(500));
|
||
sink.append(silence);
|
||
}
|
||
}
|
||
|
||
sink.append(source);
|
||
|
||
// Atomically swap sinks — extract old sink + its fade-out trigger.
|
||
let (old_sink, old_fadeout_trigger, old_fadeout_samples) = {
|
||
let mut cur = state.current.lock().unwrap();
|
||
let old = cur.sink.take();
|
||
let old_fo_trigger = cur.fadeout_trigger.take();
|
||
let old_fo_samples = cur.fadeout_samples.take();
|
||
cur.sink = Some(sink);
|
||
cur.duration_secs = duration_secs;
|
||
cur.seek_offset = 0.0;
|
||
cur.play_started = Some(Instant::now());
|
||
cur.paused_at = None;
|
||
cur.replay_gain_linear = gain_linear;
|
||
cur.base_volume = volume.clamp(0.0, 1.0);
|
||
cur.fadeout_trigger = Some(built.fadeout_trigger);
|
||
cur.fadeout_samples = Some(built.fadeout_samples);
|
||
(old, old_fo_trigger, old_fo_samples)
|
||
};
|
||
|
||
// Handle old sink: symmetric crossfade or immediate stop.
|
||
if crossfade_enabled {
|
||
if let Some(old) = old_sink {
|
||
// Trigger sample-level fade-out on Track A via TriggeredFadeOut.
|
||
// Calculate total fade samples from the measured actual_fade_secs.
|
||
let rate = state.current_sample_rate.load(Ordering::Relaxed);
|
||
let ch = state.current_channels.load(Ordering::Relaxed);
|
||
let fade_total = (actual_fade_secs as f64 * rate as f64 * ch as f64) as u64;
|
||
|
||
if let (Some(trigger), Some(samples)) = (old_fadeout_trigger, old_fadeout_samples) {
|
||
samples.store(fade_total.max(1), Ordering::SeqCst);
|
||
trigger.store(true, Ordering::SeqCst);
|
||
}
|
||
|
||
// Keep old sink alive until the fade completes + small margin,
|
||
// then drop it. No volume stepping needed — the fade-out runs
|
||
// at sample level inside the audio thread.
|
||
*state.fading_out_sink.lock().unwrap() = Some(old);
|
||
let fo_arc = state.fading_out_sink.clone();
|
||
let cleanup_dur = Duration::from_secs_f32(actual_fade_secs + 0.5);
|
||
tokio::spawn(async move {
|
||
tokio::time::sleep(cleanup_dur).await;
|
||
if let Some(s) = fo_arc.lock().unwrap().take() {
|
||
s.stop();
|
||
}
|
||
});
|
||
}
|
||
} else if let Some(old) = old_sink {
|
||
old.stop();
|
||
}
|
||
|
||
app.emit("audio:playing", duration_secs).ok();
|
||
|
||
// ── Progress + ended detection ────────────────────────────────────────────
|
||
spawn_progress_task(
|
||
gen,
|
||
state.generation.clone(),
|
||
state.current.clone(),
|
||
state.chained_info.clone(),
|
||
state.crossfade_enabled.clone(),
|
||
state.crossfade_secs.clone(),
|
||
done_flag,
|
||
app,
|
||
state.samples_played.clone(),
|
||
state.current_sample_rate.clone(),
|
||
state.current_channels.clone(),
|
||
state.gapless_switch_at.clone(),
|
||
);
|
||
|
||
Ok(())
|
||
}
|
||
|
||
/// Proactively appends the next track to the current Sink ~30 s before the
|
||
/// current track ends. Called from JS at the same trigger point as preload.
|
||
///
|
||
/// Because this runs well before the track boundary, the IPC round-trip is
|
||
/// irrelevant — by the time the current track actually ends, the next source
|
||
/// is already live in the Sink queue and rodio transitions at sample accuracy.
|
||
///
|
||
/// audio_play() checks chained_info.url on arrival: if it matches, it returns
|
||
/// immediately without touching the Sink (pure no-op on the audio path).
|
||
#[tauri::command]
|
||
pub async fn audio_chain_preload(
|
||
url: String,
|
||
volume: f32,
|
||
duration_hint: f64,
|
||
replay_gain_db: Option<f32>,
|
||
replay_gain_peak: Option<f32>,
|
||
state: State<'_, AudioEngine>,
|
||
) -> Result<(), String> {
|
||
// Idempotent: already chained this URL → nothing to do.
|
||
{
|
||
let chained = state.chained_info.lock().unwrap();
|
||
if chained.as_ref().map(|c| c.url == url).unwrap_or(false) {
|
||
return Ok(());
|
||
}
|
||
}
|
||
|
||
// Gapless must be enabled and a sink must exist.
|
||
if !state.gapless_enabled.load(Ordering::Relaxed) {
|
||
return Ok(());
|
||
}
|
||
|
||
let snapshot_gen = state.generation.load(Ordering::SeqCst);
|
||
|
||
// Fetch bytes — use preload cache if available, otherwise HTTP.
|
||
let data: Vec<u8> = {
|
||
let cached = {
|
||
let mut preloaded = state.preloaded.lock().unwrap();
|
||
if preloaded.as_ref().map(|p| p.url == url).unwrap_or(false) {
|
||
preloaded.take().map(|p| p.data)
|
||
} else {
|
||
None
|
||
}
|
||
};
|
||
if let Some(d) = cached {
|
||
d
|
||
} else {
|
||
if let Some(path) = url.strip_prefix("psysonic-local://") {
|
||
tokio::fs::read(path).await.map_err(|e| e.to_string())?
|
||
} else {
|
||
let resp = state.http_client.get(&url).send().await
|
||
.map_err(|e| e.to_string())?;
|
||
if !resp.status().is_success() {
|
||
return Ok(()); // silently fail — audio_play will retry
|
||
}
|
||
resp.bytes().await.map_err(|e| e.to_string())?.into()
|
||
}
|
||
}
|
||
};
|
||
|
||
// Bail if the user skipped to a different track while we were downloading.
|
||
if state.generation.load(Ordering::SeqCst) != snapshot_gen {
|
||
return Ok(());
|
||
}
|
||
|
||
let (gain_linear, effective_volume) = compute_gain(replay_gain_db, replay_gain_peak, volume);
|
||
|
||
let done_next = Arc::new(AtomicBool::new(false));
|
||
// Use a dedicated counter for the chained source — it will be swapped into
|
||
// samples_played when the chained track becomes active.
|
||
let chain_counter = Arc::new(AtomicU64::new(0));
|
||
let target_rate = state.current_sample_rate.load(Ordering::Relaxed);
|
||
let built = build_source(
|
||
data,
|
||
duration_hint,
|
||
state.eq_gains.clone(),
|
||
state.eq_enabled.clone(),
|
||
done_next.clone(),
|
||
Duration::ZERO, // gapless: no fade-in — sample-accurate boundary, no click
|
||
chain_counter.clone(),
|
||
target_rate,
|
||
).map_err(|e| e.to_string())?;
|
||
let source = built.source;
|
||
let duration_secs = built.duration_secs;
|
||
|
||
// Final gen check — reject if a manual skip happened during decode.
|
||
if state.generation.load(Ordering::SeqCst) != snapshot_gen {
|
||
return Ok(());
|
||
}
|
||
|
||
// Append to the existing Sink. The audio hardware stream never stalls.
|
||
{
|
||
let cur = state.current.lock().unwrap();
|
||
match &cur.sink {
|
||
Some(sink) => {
|
||
sink.set_volume(effective_volume);
|
||
sink.append(source);
|
||
}
|
||
None => return Ok(()), // playback stopped — bail
|
||
}
|
||
}
|
||
|
||
*state.chained_info.lock().unwrap() = Some(ChainedInfo {
|
||
url,
|
||
duration_secs,
|
||
replay_gain_linear: gain_linear,
|
||
base_volume: volume.clamp(0.0, 1.0),
|
||
source_done: done_next,
|
||
sample_counter: chain_counter,
|
||
});
|
||
|
||
Ok(())
|
||
}
|
||
|
||
/// Spawns the per-generation progress + ended-detection task.
|
||
///
|
||
/// The task owns a local `done: Arc<AtomicBool>` reference that starts as
|
||
/// the current track's done flag. When the progress task detects that the
|
||
/// done flag is set AND `chained_info` has data, it swaps `done` to the
|
||
/// chained source's flag and transitions state — all without creating a new
|
||
/// task or changing the generation counter.
|
||
///
|
||
/// Key changes from the previous implementation:
|
||
/// • 100 ms tick (was 500 ms) — halves worst-case event latency
|
||
/// • Position from atomic sample counter (no wall-clock drift)
|
||
/// • Immediate `audio:track_switched` event at decoder boundary
|
||
/// • `audio:ended` only fires when no chained successor exists
|
||
fn spawn_progress_task(
|
||
gen: u64,
|
||
gen_counter: Arc<AtomicU64>,
|
||
current_arc: Arc<Mutex<AudioCurrent>>,
|
||
chained_arc: Arc<Mutex<Option<ChainedInfo>>>,
|
||
crossfade_enabled_arc: Arc<AtomicBool>,
|
||
crossfade_secs_arc: Arc<AtomicU32>,
|
||
initial_done: Arc<AtomicBool>,
|
||
app: AppHandle,
|
||
samples_played: Arc<AtomicU64>,
|
||
sample_rate_arc: Arc<AtomicU32>,
|
||
channels_arc: Arc<AtomicU32>,
|
||
gapless_switch_at: Arc<AtomicU64>,
|
||
) {
|
||
tokio::spawn(async move {
|
||
let mut near_end_ticks: u32 = 0;
|
||
// Local done-flag reference; swapped on gapless transition.
|
||
let mut current_done = initial_done;
|
||
|
||
loop {
|
||
// 100 ms tick — tight enough for responsive UI, low enough CPU cost.
|
||
tokio::time::sleep(Duration::from_millis(100)).await;
|
||
|
||
if gen_counter.load(Ordering::SeqCst) != gen {
|
||
break;
|
||
}
|
||
|
||
// ── Gapless transition detection ─────────────────────────────────
|
||
// If the current source is exhausted AND we have a chained track
|
||
// ready, transition seamlessly: swap tracking state, emit
|
||
// audio:track_switched for the new track, and continue the loop.
|
||
if current_done.load(Ordering::SeqCst) {
|
||
let chained = chained_arc.lock().unwrap().take();
|
||
if let Some(info) = chained {
|
||
// Swap to the chained source's done flag.
|
||
current_done = info.source_done;
|
||
|
||
// Swap the sample counter: the chained source's counter
|
||
// is already being incremented by CountingSource. Copy its
|
||
// current value into the shared samples_played so the
|
||
// progress calculation stays accurate.
|
||
let chained_samples = info.sample_counter.load(Ordering::Relaxed);
|
||
samples_played.store(chained_samples, Ordering::Relaxed);
|
||
|
||
// Update tracking state.
|
||
{
|
||
let mut cur = current_arc.lock().unwrap();
|
||
cur.replay_gain_linear = info.replay_gain_linear;
|
||
cur.base_volume = info.base_volume;
|
||
cur.duration_secs = info.duration_secs;
|
||
cur.seek_offset = 0.0;
|
||
cur.play_started = Some(Instant::now());
|
||
}
|
||
|
||
// Record the gapless switch timestamp for ghost-command guard.
|
||
let switch_ts = std::time::SystemTime::now()
|
||
.duration_since(std::time::UNIX_EPOCH)
|
||
.unwrap_or_default()
|
||
.as_millis() as u64;
|
||
gapless_switch_at.store(switch_ts, Ordering::SeqCst);
|
||
|
||
// Emit the new track_switched event — this is immediate,
|
||
// not delayed by 500 ms like the old audio:playing was.
|
||
app.emit("audio:track_switched", info.duration_secs).ok();
|
||
near_end_ticks = 0;
|
||
continue;
|
||
}
|
||
// Current source exhausted but no chain queued — the Sink is
|
||
// likely draining; audio:ended will fire on the next tick via
|
||
// the near-end logic below.
|
||
}
|
||
|
||
// ── Position from atomic sample counter ──────────────────────────
|
||
let rate = sample_rate_arc.load(Ordering::Relaxed) as f64;
|
||
let ch = channels_arc.load(Ordering::Relaxed) as f64;
|
||
let samples = samples_played.load(Ordering::Relaxed) as f64;
|
||
let divisor = (rate * ch).max(1.0);
|
||
|
||
let dur = {
|
||
let cur = current_arc.lock().unwrap();
|
||
cur.duration_secs
|
||
};
|
||
let is_paused = {
|
||
let cur = current_arc.lock().unwrap();
|
||
cur.paused_at.is_some()
|
||
};
|
||
|
||
let pos = if is_paused {
|
||
let cur = current_arc.lock().unwrap();
|
||
cur.paused_at.unwrap_or(0.0)
|
||
} else {
|
||
(samples / divisor).min(dur.max(0.001))
|
||
};
|
||
|
||
app.emit("audio:progress", ProgressPayload { current_time: pos, duration: dur }).ok();
|
||
|
||
if is_paused {
|
||
continue;
|
||
}
|
||
|
||
let cf_enabled = crossfade_enabled_arc.load(Ordering::Relaxed);
|
||
let cf_secs = f32::from_bits(crossfade_secs_arc.load(Ordering::Relaxed)).clamp(0.5, 12.0) as f64;
|
||
let end_threshold = if cf_enabled { cf_secs.max(1.0) } else { 1.0 };
|
||
|
||
if dur > end_threshold && pos >= dur - end_threshold {
|
||
near_end_ticks += 1;
|
||
// At 100 ms ticks, 10 ticks ≈ 1 s — equivalent to the old 2×500ms.
|
||
if near_end_ticks >= 10 {
|
||
gen_counter.fetch_add(1, Ordering::SeqCst);
|
||
app.emit("audio:ended", ()).ok();
|
||
break;
|
||
}
|
||
} else {
|
||
near_end_ticks = 0;
|
||
}
|
||
}
|
||
});
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_pause(state: State<'_, AudioEngine>) {
|
||
let mut cur = state.current.lock().unwrap();
|
||
if let Some(sink) = &cur.sink {
|
||
if !sink.is_paused() {
|
||
let pos = cur.position();
|
||
sink.pause();
|
||
cur.paused_at = Some(pos);
|
||
cur.play_started = None;
|
||
}
|
||
}
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_resume(state: State<'_, AudioEngine>) {
|
||
let mut cur = state.current.lock().unwrap();
|
||
if let Some(sink) = &cur.sink {
|
||
if sink.is_paused() {
|
||
let pos = cur.paused_at.unwrap_or(cur.seek_offset);
|
||
sink.play();
|
||
cur.seek_offset = pos;
|
||
cur.play_started = Some(Instant::now());
|
||
cur.paused_at = None;
|
||
}
|
||
}
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_stop(state: State<'_, AudioEngine>) {
|
||
state.generation.fetch_add(1, Ordering::SeqCst);
|
||
*state.chained_info.lock().unwrap() = None;
|
||
let mut cur = state.current.lock().unwrap();
|
||
if let Some(sink) = cur.sink.take() {
|
||
sink.stop();
|
||
}
|
||
cur.duration_secs = 0.0;
|
||
cur.seek_offset = 0.0;
|
||
cur.play_started = None;
|
||
cur.paused_at = None;
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_seek(seconds: f64, state: State<'_, AudioEngine>) -> Result<(), String> {
|
||
// Ghost-command guard: reject seeks within 500 ms of a gapless auto-advance.
|
||
{
|
||
let switch_ms = state.gapless_switch_at.load(Ordering::SeqCst);
|
||
if switch_ms > 0 {
|
||
let now_ms = std::time::SystemTime::now()
|
||
.duration_since(std::time::UNIX_EPOCH)
|
||
.unwrap_or_default()
|
||
.as_millis() as u64;
|
||
if now_ms.saturating_sub(switch_ms) < 500 {
|
||
return Ok(());
|
||
}
|
||
}
|
||
}
|
||
|
||
// Seeking back invalidates any pending gapless chain.
|
||
let cur_pos = {
|
||
let cur = state.current.lock().unwrap();
|
||
cur.position()
|
||
};
|
||
if seconds < cur_pos - 1.0 {
|
||
*state.chained_info.lock().unwrap() = None;
|
||
}
|
||
|
||
let mut cur = state.current.lock().unwrap();
|
||
if cur.sink.is_none() { return Ok(()); }
|
||
|
||
cur.sink.as_ref().unwrap()
|
||
.try_seek(Duration::from_secs_f64(seconds.max(0.0)))
|
||
.map_err(|e| e.to_string())?;
|
||
|
||
if cur.paused_at.is_some() {
|
||
cur.paused_at = Some(seconds);
|
||
} else {
|
||
cur.seek_offset = seconds;
|
||
cur.play_started = Some(Instant::now());
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_set_volume(volume: f32, state: State<'_, AudioEngine>) {
|
||
let mut cur = state.current.lock().unwrap();
|
||
cur.base_volume = volume.clamp(0.0, 1.0);
|
||
if let Some(sink) = &cur.sink {
|
||
sink.set_volume((cur.base_volume * cur.replay_gain_linear * MASTER_HEADROOM).clamp(0.0, 1.0));
|
||
}
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_set_eq(gains: [f32; 10], enabled: bool, state: State<'_, AudioEngine>) {
|
||
state.eq_enabled.store(enabled, Ordering::Relaxed);
|
||
for (i, &gain) in gains.iter().enumerate() {
|
||
state.eq_gains[i].store(gain.clamp(-12.0, 12.0).to_bits(), Ordering::Relaxed);
|
||
}
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub async fn audio_preload(
|
||
url: String,
|
||
duration_hint: f64,
|
||
state: State<'_, AudioEngine>,
|
||
) -> Result<(), String> {
|
||
{
|
||
let preloaded = state.preloaded.lock().unwrap();
|
||
if preloaded.as_ref().map(|p| p.url == url).unwrap_or(false) {
|
||
return Ok(());
|
||
}
|
||
}
|
||
let data: Vec<u8> = if let Some(path) = url.strip_prefix("psysonic-local://") {
|
||
tokio::fs::read(path).await.map_err(|e| e.to_string())?
|
||
} else {
|
||
let response = state.http_client.get(&url).send().await.map_err(|e| e.to_string())?;
|
||
if !response.status().is_success() {
|
||
return Ok(());
|
||
}
|
||
response.bytes().await.map_err(|e| e.to_string())?.into()
|
||
};
|
||
let _ = duration_hint; // kept in API for compatibility
|
||
*state.preloaded.lock().unwrap() = Some(PreloadedTrack { url, data });
|
||
Ok(())
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_set_crossfade(enabled: bool, secs: f32, state: State<'_, AudioEngine>) {
|
||
state.crossfade_enabled.store(enabled, Ordering::Relaxed);
|
||
state.crossfade_secs.store(secs.clamp(0.5, 12.0).to_bits(), Ordering::Relaxed);
|
||
}
|
||
|
||
#[tauri::command]
|
||
pub fn audio_set_gapless(enabled: bool, state: State<'_, AudioEngine>) {
|
||
state.gapless_enabled.store(enabled, Ordering::Relaxed);
|
||
}
|