#
# Copyright (c) 2024-2026, Daily
#
# SPDX-License-Identifier: BSD 2-Clause License
#
"""Resampy-based audio resampler implementation.
This module provides an audio resampler that uses the resampy library
for high-quality audio sample rate conversion.
"""
import numpy as np
import resampy
from pipecat.audio.resamplers.base_audio_resampler import BaseAudioResampler
[docs]
class ResampyResampler(BaseAudioResampler):
"""Audio resampler implementation using the resampy library.
This resampler uses the resampy library's Kaiser windowing filter
for high-quality audio resampling with good performance characteristics.
"""
[docs]
def __init__(self, **kwargs):
"""Initialize the resampy resampler.
Args:
**kwargs: Additional keyword arguments (currently unused).
"""
pass
[docs]
async def resample(self, audio: bytes, in_rate: int, out_rate: int) -> bytes:
"""Resample audio data using resampy library.
Args:
audio: Input audio data as raw bytes (16-bit signed integers).
in_rate: Original sample rate in Hz.
out_rate: Target sample rate in Hz.
Returns:
Resampled audio data as raw bytes (16-bit signed integers).
"""
if in_rate == out_rate:
return audio
audio_data = np.frombuffer(audio, dtype=np.int16)
resampled_audio = resampy.resample(audio_data, in_rate, out_rate, filter="kaiser_fast")
result = resampled_audio.astype(np.int16).tobytes()
return result