# convert audio files to protocol v3 stream
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import librosa
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import opuslib
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import struct
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import sys
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import tqdm
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import numpy as np
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import argparse
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import pyloudnorm as pyln
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def encode_audio_to_opus(input_file, output_file, target_lufs=None):
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# Load audio file using librosa
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audio, sample_rate = librosa.load(input_file, sr=None, mono=False, dtype=np.float32)
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# Convert to mono if stereo
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if audio.ndim == 2:
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audio = librosa.to_mono(audio)
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if target_lufs is not None:
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print("Note: Automatic loudness adjustment is enabled, which may cause", file=sys.stderr)
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print(" audio distortion. If the input audio has already been ", file=sys.stderr)
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print(" loudness-adjusted or if the input audio is TTS audio, ", file=sys.stderr)
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print(" please use the `-d` parameter to disable loudness adjustment.", file=sys.stderr)
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meter = pyln.Meter(sample_rate)
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current_loudness = meter.integrated_loudness(audio)
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audio = pyln.normalize.loudness(audio, current_loudness, target_lufs)
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print(f"Adjusted loudness: {current_loudness:.1f} LUFS -> {target_lufs} LUFS")
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# Convert sample rate to 16000Hz if necessary
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target_sample_rate = 16000
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if sample_rate != target_sample_rate:
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audio = librosa.resample(audio, orig_sr=sample_rate, target_sr=target_sample_rate)
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sample_rate = target_sample_rate
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# Convert audio data back to int16 after processing
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audio = (audio * 32767).astype(np.int16)
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# Initialize Opus encoder
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encoder = opuslib.Encoder(sample_rate, 1, opuslib.APPLICATION_AUDIO)
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# Encode and save
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with open(output_file, 'wb') as f:
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duration = 60 # 60ms per frame
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frame_size = int(sample_rate * duration / 1000)
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for i in tqdm.tqdm(range(0, len(audio) - frame_size, frame_size)):
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frame = audio[i:i + frame_size]
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opus_data = encoder.encode(frame.tobytes(), frame_size=frame_size)
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packet = struct.pack('>BBH', 0, 0, len(opus_data)) + opus_data
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f.write(packet)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description='Convert audio to Opus with loudness normalization')
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parser.add_argument('input_file', help='Input audio file')
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parser.add_argument('output_file', help='Output .opus file')
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parser.add_argument('-l', '--lufs', type=float, default=-16.0,
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help='Target loudness in LUFS (default: -16)')
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parser.add_argument('-d', '--disable-loudnorm', action='store_true',
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help='Disable loudness normalization')
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args = parser.parse_args()
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target_lufs = None if args.disable_loudnorm else args.lufs
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encode_audio_to_opus(args.input_file, args.output_file, target_lufs)
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