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