RC1

create_silent_opus.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""
+Create a silent OPUS audio file with 1 second of silence.
+"""
+import os
+import opuslib
+import numpy as np
+import struct
+
+# Configuration
+SAMPLE_RATE = 48000
+CHANNELS = 1
+FRAME_SIZE = 960  # 20ms at 48kHz
+SILENCE_DURATION = 1.0  # seconds
+OUTPUT_FILE = "silent.opus"
+
+# Calculate number of frames needed
+num_frames = int((SAMPLE_RATE * SILENCE_DURATION) / (FRAME_SIZE * CHANNELS))
+
+# Initialize Opus encoder
+enc = opuslib.Encoder(SAMPLE_RATE, CHANNELS, 'voip')
+
+# Create silent audio data (all zeros)
+silent_frame = struct.pack('h' * FRAME_SIZE * CHANNELS, *([0] * FRAME_SIZE * CHANNELS))
+
+# Create Ogg Opus file
+with open(OUTPUT_FILE, 'wb') as f:
+    # Write Ogg header
+    f.write(b'OggS')  # Magic number
+    f.write(b'\x00')  # Version
+    f.write(b'\x00')  # Header type (0 = normal)
+    f.write(b'\x00\x00\x00\x00\x00\x00\x00\x00')  # Granule position
+    f.write(b'\x00\x00\x00\x00')  # Bitstream serial number
+    f.write(b'\x00\x00\x00\x00')  # Page sequence number
+    f.write(b'\x00\x00\x00\x00')  # Checksum
+    f.write(b'\x01')  # Number of segments
+    f.write(b'\x00')  # Segment table (0 = 1 byte segment)
+    
+    # Write Opus header
+    f.write(b'OpusHead')  # Magic signature
+    f.write(b'\x01')  # Version
+    f.write(chr(CHANNELS).encode('latin1'))  # Channel count
+    f.write(struct.pack('<H', 80))  # Preskip (80 samples)
+    f.write(struct.pack('<I', SAMPLE_RATE))  # Input sample rate
+    f.write(b'\x00\x00')  # Output gain
+    f.write(b'\x00')  # Channel mapping family (0 = mono/stereo)
+    
+    # Write comment header
+    f.write(b'OpusTags')  # Magic signature
+    f.write(struct.pack('<I', 0))  # Vendor string length (0 for none)
+    f.write(struct.pack('<I', 0))  # Number of comments (0)
+    
+    # Encode and write silent frames
+    for _ in range(num_frames):
+        # Encode the silent frame
+        encoded = enc.encode(silent_frame, FRAME_SIZE)
+        
+        # Write Ogg page
+        f.write(b'OggS')  # Magic number
+        f.write(b'\x00')  # Version
+        f.write(b'\x00')  # Header type (0 = normal)
+        f.write(struct.pack('<Q', (FRAME_SIZE * _) % (1 << 64)))  # Granule position
+        f.write(b'\x00\x00\x00\x00')  # Bitstream serial number
+        f.write(struct.pack('<I', _ + 2))  # Page sequence number
+        f.write(b'\x00\x00\x00\x00')  # Checksum (0 for now)
+        f.write(b'\x01')  # Number of segments
+        f.write(chr(len(encoded)).encode('latin1'))  # Segment length
+        f.write(encoded)  # The encoded data
+
+print(f"Created silent OPUS file: {OUTPUT_FILE}")