知识点
- wave包的读写及参数设置
- 文件路径操作拼接
- 音频相关参数了解
wav文件存储的参数信息有：通道数、采样率、位深，其他参数如文件大小，数据大小等。详细内容见：wav文件格式解析。
wav转pcm
思路：
- 利用wav工具包，跳过包头，直接读取裸流bytes数据
- 将裸流数据
wb模式按二进制写入pcm文件中
import os
import wave
def wav2pcm(input_dir, out_dir) :
with open(input_dir, 'rb') as wavfile:
ori_data = wavfile.read() ## 读出来是裸流bytes数据
wavfile.close()
with open(out_dir, 'wb') as pcmfile:
pcmfile.write(ori_data)
pcmfile.close()
if __name__ == '__main__':
wav2pcm(os.path.join(r"D:\seq\input\6channel_file.wav"),
r"D:\seq\out\6channel_file_48k_16bit.pcm")
pcm转wav
## 功能：将pcm文件转成对应wav文件，无压缩
import os
import wave
def pcm2wav(pcm_path, out_path, channel, sample_rate):
with open(pcm_path, 'rb') as pcm_file:
pcm_data = pcm_file.read()
pcm_file.close()
with wave.open(out_path, 'wb') as wav_file:
## 不解之处， 16 // 8， 第4个参数0为何有效
wav_file.setparams((channel, 16 // 8, sample_rate, 0, 'NONE', 'NONE'))
wav_file.writeframes(pcm_data)
wav_file.close()
if __name__ == '__main__':
dir = r"C:\Users\Administrator\Desktop\test"
out_dir = dir + r"\outwav"
sample_rate = 48000
channel = 1
out_path = os.path.join(out_dir, "16k.wav")
pcm2wav(os.path.join(dir, "16k.pcm"), out_path, channel, sample_rate)
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