解决 Audio data must be floating-point

[zhouzhenneng]

在魔塔在线体验和本地部署之后，上传wav音频，均遇到如下报错：
File "funclip/launch.py", line 21, in audio_recog
return audio_clipper.recog(audio_input, sd_switch, hotwords=hotwords)
File "/root/FunClip/FunClip/funclip/videoclipper.py", line 30, in recog
data = librosa.resample(data, orig_sr=sr, target_sr=16000)
File "/root/miniconda3/envs/funclip/lib/python3.8/site-packages/librosa/core/audio.py", line 627, in resample
util.valid_audio(y, mono=False)
File "/root/miniconda3/envs/funclip/lib/python3.8/site-packages/librosa/util/utils.py", line 298, in valid_audio
raise ParameterError("Audio data must be floating-point")
librosa.util.exceptions.ParameterError: Audio data must be floating-point
这段报错，主要是librosa 在处理音频数据时期望浮点型数据，但接收到的可能是整型数据（例如int16）。librosa 处理音频时，音频数据需要是浮点数格式，通常范围在 -1.0 到 1.0，所以增加了convert_pcm_to_float 函数将音频转成浮点数

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