rehanuddin commited on
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d9e6e0a
1 Parent(s): 6a0fa25

Upload streaming.py

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Files changed (1) hide show
  1. streaming.py +66 -0
streaming.py ADDED
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+ import subprocess
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+
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+ import numpy as np
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+
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+
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+ def ffmpeg_stream(youtube_url, sampling_rate=16_000, chunk_duration_ms=5000, pad_duration_ms=200):
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+ """
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+ Helper function to read an audio file through ffmpeg.
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+ """
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+ chunk_len = int(sampling_rate * chunk_duration_ms / 1000)
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+ pad_len = int(sampling_rate * pad_duration_ms / 1000)
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+ read_chunk_len = chunk_len + pad_len * 2
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+
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+ ar = f"{sampling_rate}"
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+ ac = "1"
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+ format_for_conversion = "f32le"
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+ dtype = np.float32
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+ size_of_sample = 4
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+
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+ ffmpeg_command = [
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+ "ffmpeg",
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+ "-i",
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+ "pipe:",
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+ "-ac",
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+ ac,
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+ "-ar",
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+ ar,
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+ "-f",
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+ format_for_conversion,
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+ "-hide_banner",
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+ "-loglevel",
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+ "quiet",
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+ "pipe:1",
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+ ]
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+
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+ ytdl_command = ["yt-dlp", "-f", "bestaudio", youtube_url, "--quiet", "-o", "-"]
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+
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+ try:
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+ ffmpeg_process = subprocess.Popen(ffmpeg_command, stdin=subprocess.PIPE, stdout=subprocess.PIPE, bufsize=-1)
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+ ytdl_process = subprocess.Popen(ytdl_command, stdout=ffmpeg_process.stdin)
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+ except FileNotFoundError:
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+ raise ValueError("ffmpeg was not found but is required to stream audio files from filename")
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+
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+ acc = b""
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+ leftover = np.zeros((0,), dtype=np.float32)
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+ while ytdl_process.poll() is None:
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+ buflen = read_chunk_len * size_of_sample
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+
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+ raw = ffmpeg_process.stdout.read(buflen)
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+ if raw == b"":
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+ break
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+
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+ if len(acc) + len(raw) > buflen:
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+ acc = raw
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+ else:
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+ acc += raw
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+
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+ audio = np.frombuffer(acc, dtype=dtype)
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+ audio = np.concatenate([leftover, audio])
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+ if len(audio) < pad_len * 2:
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+ # TODO: handle end of stream better than this
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+ break
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+ yield audio
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+
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+ leftover = audio[-pad_len * 2 :]
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+ read_chunk_len = chunk_len