invoke timebase callback, persists state but doesn't seem to do anything

src/time.rs

@@ -1,9 +1,205 @@
-pub(crate) mod clock;    pub(crate) use clock::*;
-pub(crate) mod moment;   pub(crate) use moment::*;
-pub(crate) mod perf;     pub(crate) use perf::*;
-pub(crate) mod pulse;    pub(crate) use pulse::*;
-pub(crate) mod sr;       pub(crate) use sr::*;
-pub(crate) mod unit;     pub(crate) use unit::*;
+use crate::*;
+
+pub mod microsecond;  pub(crate) use self::microsecond::*;
+pub mod moment;       pub(crate) use self::moment::*;
+pub mod perf;         pub(crate) use self::perf::*;
+pub mod pulse;        pub(crate) use self::pulse::*;
+pub mod sample_count; pub(crate) use self::sample_count::*;
+pub mod sample_rate;  pub(crate) use self::sample_rate::*;
+pub mod timebase;     pub(crate) use self::timebase::*;
+pub mod unit;         pub(crate) use self::unit::*;
+
+pub trait HasClock: Send + Sync {
+    fn clock (&self) -> &ClockModel;
+}
+
+#[macro_export] macro_rules! has_clock {
+    (|$self:ident:$Struct:ident$(<$($L:lifetime),*$($T:ident$(:$U:path)?),*>)?|$cb:expr) => {
+        impl $(<$($L),*$($T $(: $U)?),*>)? HasClock for $Struct $(<$($L),*$($T),*>)? {
+            fn clock (&$self) -> &ClockModel { $cb }
+        }
+    }
+}
+
+/// Hosts the JACK callback for updating the temporal pointer and playback status.
+pub struct ClockAudio<'a, T: HasClock>(pub &'a mut T);
+
+impl<T: HasClock> Audio for ClockAudio<'_, T> {
+    #[inline] fn process (&mut self, _: &Client, scope: &ProcessScope) -> Control {
+        self.0.clock().update_from_scope(scope).unwrap();
+        Control::Continue
+    }
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum ClockCommand {
+    Play(Option<u32>),
+    Pause(Option<u32>),
+    SeekUsec(f64),
+    SeekSample(f64),
+    SeekPulse(f64),
+    SetBpm(f64),
+    SetQuant(f64),
+    SetSync(f64),
+}
+
+impl<T: HasClock> Command<T> for ClockCommand {
+    fn execute (self, state: &mut T) -> Perhaps<Self> {
+        use ClockCommand::*;
+        match self {
+            Play(start)        => state.clock().play_from(start)?,
+            Pause(pause)       => state.clock().pause_at(pause)?,
+            SeekUsec(usec)     => state.clock().playhead.update_from_usec(usec),
+            SeekSample(sample) => state.clock().playhead.update_from_sample(sample),
+            SeekPulse(pulse)   => state.clock().playhead.update_from_pulse(pulse),
+            SetBpm(bpm)        => return Ok(Some(SetBpm(state.clock().timebase().bpm.set(bpm)))),
+            SetQuant(quant)    => return Ok(Some(SetQuant(state.clock().quant.set(quant)))),
+            SetSync(sync)      => return Ok(Some(SetSync(state.clock().sync.set(sync)))),
+        };
+        Ok(None)
+    }
+}
+
+#[derive(Clone)]
+pub struct ClockModel {
+    /// JACK transport handle.
+    pub transport: Arc<Transport>,
+    /// Global temporal resolution (shared by [Moment] fields)
+    pub timebase:  Arc<Timebase>,
+    /// Current global sample and usec (monotonic from JACK clock)
+    pub global:    Arc<Moment>,
+    /// Global sample and usec at which playback started
+    pub started:   Arc<RwLock<Option<Moment>>>,
+    /// Playback offset (when playing not from start)
+    pub offset:    Arc<Moment>,
+    /// Current playhead position
+    pub playhead:  Arc<Moment>,
+    /// Note quantization factor
+    pub quant:     Arc<Quantize>,
+    /// Launch quantization factor
+    pub sync:      Arc<LaunchSync>,
+    /// Size of buffer in samples
+    pub chunk:     Arc<AtomicUsize>,
+}
+
+from!(|jack: &Arc<RwLock<JackClient>>| ClockModel = {
+    let jack      = jack.read().unwrap();
+    let chunk     = jack.client().buffer_size();
+    let transport = jack.client().transport();
+    let timebase  = Arc::new(Timebase::default());
+    Self {
+        quant:     Arc::new(24.into()),
+        sync:      Arc::new(384.into()),
+        transport: Arc::new(transport),
+        chunk:     Arc::new((chunk as usize).into()),
+        global:    Arc::new(Moment::zero(&timebase)),
+        playhead:  Arc::new(Moment::zero(&timebase)),
+        offset:    Arc::new(Moment::zero(&timebase)),
+        started:   RwLock::new(None).into(),
+        timebase,
+    }
+});
+
+impl std::fmt::Debug for ClockModel {
+    fn fmt (&self, f: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
+        f.debug_struct("ClockModel")
+            .field("timebase", &self.timebase)
+            .field("chunk",    &self.chunk)
+            .field("quant",    &self.quant)
+            .field("sync",     &self.sync)
+            .field("global",   &self.global)
+            .field("playhead", &self.playhead)
+            .field("started",  &self.started)
+            .finish()
+    }
+}
+
+impl ClockModel {
+    pub fn timebase (&self) -> &Arc<Timebase> {
+        &self.timebase
+    }
+    /// Current sample rate
+    pub fn sr (&self) -> &SampleRate {
+        &self.timebase.sr
+    }
+    /// Current tempo
+    pub fn bpm (&self) -> &BeatsPerMinute {
+        &self.timebase.bpm
+    }
+    /// Current MIDI resolution
+    pub fn ppq (&self) -> &PulsesPerQuaver {
+        &self.timebase.ppq
+    }
+    /// Next pulse that matches launch sync (for phrase switchover)
+    pub fn next_launch_pulse (&self) -> usize {
+        let sync  = self.sync.get() as usize;
+        let pulse = self.playhead.pulse.get() as usize;
+        if pulse % sync == 0 {
+            pulse
+        } else {
+            (pulse / sync + 1) * sync
+        }
+    }
+    /// Start playing, optionally seeking to a given location beforehand
+    pub fn play_from (&self, start: Option<u32>) -> Usually<()> {
+        if let Some(start) = start {
+            self.transport.locate(start)?;
+        }
+        self.transport.start()?;
+        Ok(())
+    }
+    /// Pause, optionally seeking to a given location afterwards
+    pub fn pause_at (&self, pause: Option<u32>) -> Usually<()> {
+        self.transport.stop()?;
+        if let Some(pause) = pause {
+            self.transport.locate(pause)?;
+        }
+        Ok(())
+    }
+    /// Is currently paused?
+    pub fn is_stopped (&self) -> bool {
+        self.started.read().unwrap().is_none()
+    }
+    /// Is currently playing?
+    pub fn is_rolling (&self) -> bool {
+        self.started.read().unwrap().is_some()
+    }
+    /// Update chunk size
+    pub fn set_chunk (&self, n_frames: usize) {
+        self.chunk.store(n_frames, Relaxed);
+    }
+    pub fn update_from_scope (&self, scope: &ProcessScope) -> Usually<()> {
+        // Store buffer length
+        self.set_chunk(scope.n_frames() as usize);
+
+        // Store reported global frame and usec
+        let CycleTimes { current_frames, current_usecs, .. } = scope.cycle_times()?;
+        self.global.sample.set(current_frames as f64);
+        self.global.usec.set(current_usecs as f64);
+
+        // If transport has just started or just stopped,
+        // update starting point:
+        let mut started = self.started.write().unwrap();
+        match (self.transport.query_state()?, started.as_ref()) {
+            (TransportState::Rolling, None) => {
+                let moment = Moment::zero(&self.timebase);
+                moment.sample.set(current_frames as f64);
+                moment.usec.set(current_usecs as f64);
+                *started = Some(moment);
+            },
+            (TransportState::Stopped, Some(_)) => {
+                *started = None;
+            },
+            _ => {}
+        };
+
+        self.playhead.update_from_sample(started.as_ref()
+            .map(|started|current_frames as f64 - started.sample.get())
+            .unwrap_or(0.));
+
+        Ok(())
+    }
+}
 
 //#[cfg(test)]
 //mod test {