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33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
  
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import struct
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def decode_opus_from_file(input_file):
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"""
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从p3文件中解码 Opus 数据，并返回一个 Opus 数据包的列表以及总时长。
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"""
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opus_datas = []
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total_frames = 0
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sample_rate = 16000 # 文件采样率
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frame_duration_ms = 60 # 帧时长
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frame_size = int(sample_rate * frame_duration_ms / 1000)
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with open(input_file, 'rb') as f:
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while True:
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# 读取头部（4字节）：[1字节类型，1字节保留，2字节长度]
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header = f.read(4)
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if not header:
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break
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# 解包头部信息
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_, _, data_len = struct.unpack('>BBH', header)
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# 根据头部指定的长度读取 Opus 数据
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opus_data = f.read(data_len)
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if len(opus_data) != data_len:
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raise ValueError(f"Data length({len(opus_data)}) mismatch({data_len}) in the file.")
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opus_datas.append(opus_data)
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total_frames += 1
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# 计算总时长
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total_duration = (total_frames * frame_duration_ms) / 1000.0
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return opus_datas, total_duration
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