Add visualization

turntable/cli.py

@@ -1,9 +1,10 @@
 import logging
 
-from turntable import application
+from turntable import application, turntable
 
 
 def main() -> None:
     with application.run() as events:
         while event := events.get():
-            logging.info("Event: %s", event)
+            if not isinstance(event, turntable.Audio):
+                logging.info("Event: %s", event)

turntable/gui.py

@@ -1,52 +1,103 @@
 import logging
 import queue
+from statistics import fmean
+from typing import Iterable, List, Optional, Tuple, Union
 
+import numpy as np  # type: ignore
 import pyglet  # type: ignore
 import pyglet.clock  # type: ignore
+import scipy.signal  # type: ignore
 
 from turntable import application, turntable
 
+
+class Plot:
+    def __init__(
+        self,
+        x: int,
+        y: int,
+        width: int,
+        height: int,
+        bars: int = 20,
+        bar_width: int = 40,
+        color: Tuple[int, int, int] = (255, 255, 255),
+        batch: Optional[pyglet.graphics.Batch] = None,
+    ) -> None:
+        self.x = x
+        self.y = y
+        self.width = width
+        self.height = height
+        self.bars = bars
+        self.bar_width = bar_width
+        self.color = color
+        self.batch = batch or pyglet.graphics.Batch()
+        self.lines: List[pyglet.shapes.Line] = []
+
+    def update(self, data):
+        heights = scipy.signal.resample(data, self.bars) * self.height / 2 ** 16
+        self.lines = [
+            pyglet.shapes.Line(
+                self.x + x / self.bars * self.width,
+                0,
+                self.x + x / self.bars * self.width,
+                y,
+                width=self.bar_width,
+                color=self.color,
+                batch=self.batch,
+            )
+            for x, y in enumerate(heights)
+        ]
+
+    def draw(self) -> None:
+        self.batch.draw()
+
+
 def main():
     window = pyglet.window.Window(fullscreen=True)
     with application.run() as events:
         label = pyglet.text.Label(
             "<Idle>",
-            font_name='Noto Sans',
+            font_name="Noto Sans",
             font_size=36,
-            x = window.width // 2,
-            y = window.height // 2,
-            anchor_x = 'center',
-            anchor_y = 'center')
+            x=window.width // 2,
+            y=window.height // 2,
+            anchor_x="center",
+            anchor_y="center",
+        )
+        batch = pyglet.graphics.Batch()
+        plot = Plot(
+            x=0,
+            y=0,
+            width=window.width,
+            height=window.height,
+            bars=40,
+            bar_width=window.width // 45,
+            color=(139, 0, 139),
+            batch=batch,
+        )
 
         @window.event
         def on_draw():
             window.clear()
+            batch.draw()
             label.draw()
 
         def check_events(dt):
             try:
                 event = events.get(False)
-                logging.info("Event: %s", event)
-                logging.info("Label: %s", label)
                 if isinstance(event, turntable.StartedPlaying):
                     label.text = "<Record starting...>"
                 elif isinstance(event, turntable.StoppedPlaying):
                     label.text = "<Idle>"
                 elif isinstance(event, turntable.NewMetadata):
                     label.text = event.title
+                elif isinstance(event, turntable.Audio):
+                    data = np.fromstring(event.pcm.raw, dtype=np.int16)
+                    fft = abs(np.fft.fft(data).real)
+                    fft = fft[: len(fft) // 2]
+                    plot.update(fft)
             except queue.Empty:
                 ...
-            except:
-                logging.exception("Oops")
 
-        pyglet.clock.schedule_interval_soft(check_events, 0.5)
+        pyglet.clock.schedule(check_events)
         pyglet.app.run()
-        # icecast.set_title("<Idle>")
-        # while event := events.get():
-        #     logging.info("Event: %s", event)
-            # if isinstance(event, StartedPlaying):
-            #     icecast.set_title("<Record starting...>")
-            # elif isinstance(event, StoppedPlaying):
-            #     icecast.set_title("<Idle>")
-            # elif isinstance(event, NewMetadata):
-            #     icecast.set_title(event.title)

turntable/models.py

@@ -43,6 +43,9 @@ class PCM:
         for i in range(0, len(self._data), self.framesize):
             yield PCM(self.framerate, self.channels, self.raw[i : i + self.framesize])
 
+    def __len__(self) -> int:
+        return len(self._data) // self.framesize
+
     def append(self, other: "PCM") -> None:
         if other.framerate != self.framerate or other.channels != self.channels:
             raise ValueError("Cannot append incompatible PCM audio")

turntable/turntable.py

@@ -55,6 +55,9 @@ class StoppedPlaying(Event):
 class NewMetadata(Event):
     title: str
 
+@dataclass
+class Audio(Event):
+    pcm: PCM
 
 class PCMRecognizer(BaseRecognizer):
     @staticmethod
@@ -103,6 +106,7 @@ class Turntable(Process):
         logger.info("Initializing Turntable")
         while fragment := self.pcm_in.get():
             self.buffer.append(fragment)
+            self.events_out.put(Audio(fragment))
             maximum = audioop.max(fragment.raw, 2)
             self.update_audiolevel(maximum)