From 66285629ac08546e25a7c54e3838e341303bee6f Mon Sep 17 00:00:00 2001
From: Khushal Sarode <105520366+Khushalsarode@users.noreply.github.com>
Date: Fri, 2 Aug 2024 21:52:41 +0530
Subject: [PATCH] adding chromagram visualizer.py (#179)

---
 chromagram.py | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 chromagram.py

diff --git a/chromagram.py b/chromagram.py
new file mode 100644
index 0000000..be6c97f
--- /dev/null
+++ b/chromagram.py
@@ -0,0 +1,90 @@
+import numpy as np
+import sounddevice as sd
+import librosa
+import librosa.display
+import matplotlib.pyplot as plt
+import matplotlib.animation as animation
+from matplotlib.widgets import Button
+
+# Constants
+CHUNK = 1024
+RATE = 22050  # Sample rate
+
+# Initialize plot
+fig, ax = plt.subplots()
+chroma_data = np.zeros((12, CHUNK // 2))
+img = librosa.display.specshow(chroma_data, sr=RATE, x_axis='time', y_axis='chroma', ax=ax, cmap='viridis')
+fig.colorbar(img, ax=ax)
+ax.set_title('Chromagram')
+ax.set_xlabel('Time')
+ax.set_ylabel('Pitch Class')
+
+is_paused = False
+color_maps = ['viridis', 'inferno', 'plasma', 'magma', 'cividis']
+color_map_index = 0
+
+# Function to initialize the plot
+def init():
+    ax.set_xlim(0, CHUNK // 2)
+    ax.set_ylim(0, 1)
+    return ax,
+
+# Function to update the plot
+def update(frame):
+    global chroma_data, is_paused, img
+    if not is_paused:
+        chromagram = librosa.feature.chroma_stft(y=audio_data, sr=RATE, n_fft=CHUNK, hop_length=CHUNK // 2)
+        ax.clear()
+        img = librosa.display.specshow(chromagram, sr=RATE, x_axis='time', y_axis='chroma', ax=ax, cmap=color_maps[color_map_index])
+        ax.set_title('Chromagram')
+    return [img]
+
+# Callback function for audio input stream
+def audio_callback(indata, frames, time, status):
+    global audio_data
+    if status:
+        print(status)
+    audio_data = indata[:, 0]
+
+# Function to toggle pause/resume
+def toggle_pause(event):
+    global is_paused
+    is_paused = not is_paused
+    if is_paused:
+        ax.set_title('Chromagram (Paused)')
+    else:
+        ax.set_title('Chromagram')
+
+# Function to change color map
+def change_colormap(event):
+    global color_map_index
+    color_map_index = (color_map_index + 1) % len(color_maps)
+    # Force a redraw with the new colormap
+    update(None)
+
+# Add pause/resume button
+ax_pause = plt.axes([0.81, 0.01, 0.1, 0.075])
+btn_pause = Button(ax_pause, 'Pause/Resume')
+btn_pause.on_clicked(toggle_pause)
+
+# Add change color map button
+ax_colormap = plt.axes([0.61, 0.01, 0.15, 0.075])
+btn_colormap = Button(ax_colormap, 'Change Color Map')
+btn_colormap.on_clicked(change_colormap)
+
+# Initialize audio buffer
+audio_data = np.zeros(CHUNK)
+
+# Start the audio input stream
+stream = sd.InputStream(callback=audio_callback, channels=1, samplerate=RATE, blocksize=CHUNK)
+stream.start()
+
+# Start the animation
+ani = animation.FuncAnimation(fig, update, init_func=init, blit=False, interval=50)
+
+# Show plot
+plt.show()
+
+# Stop the stream on exit
+stream.stop()
+stream.close()