I’m working with an API that streams real-time audio in the MP3 format (44.1kHz/16bit) and I need to convert this stream to 8000/mulaw. I’m currently using PyDub and Python’s audioop module to decode and process each chunk of audio as it arrives, but I often encounter errors due to incomplete MP3 frames. A frame could potentially be split between two chunks, so I can’t decode them independently.
Does anyone have any ideas on how I can handle this? Is there a way to process an MP3 stream in real-time while converting to 8000/mulaw, possibly using a different library or approach?
Here’s a simplified version of my current code:
from pydub import AudioSegment import audioop import io class StreamConverter: def __init__(self): self.state = None self.buffer = b'' def convert_chunk(self, chunk): # Add the chunk to the buffer self.buffer += chunk # Try to decode the buffer try: audio = AudioSegment.from_mp3(io.BytesIO(self.buffer)) except CouldntDecodeError: return None # If decoding was successful, empty the buffer self.buffer = b'' # Ensure audio is mono if audio.channels != 1: audio = audio.set_channels(1) # Get audio data as bytes raw_audio = audio.raw_data # Sample rate conversion chunk_8khz, self.state = audioop.ratecv(raw_audio, audio.sample_width, audio.channels, audio.frame_rate, 8000, self.state) # μ-law conversion chunk_ulaw = audioop.lin2ulaw(chunk_8khz, audio.sample_width) return chunk_ulaw # This is then used as follows: for chunk in audio_stream: if chunk is not None: ulaw_chunk = converter.convert_chunk(chunk) # send ulaw_chunk to twilio api
I need help handling the issue of incomplete MP3 frames in the real-time streaming process while converting to 8000/mulaw. Is there an alternative library or approach that can help me achieve this?