本文主要对wave文件做个说明
Wav 文件
WAV，即WAVE(Waveform Audio File Format, 波形音频文件格式)，是微软资源交换文件格式(RIFF)规范的一个子集，用于存储数字音频文件。是一种无压缩格式文件
The WAVE file format, 由 文件头和文件本身构成. 一个 WAVE 文件是单独的 “WAVE” 块， 其有两部分组成:
- a “fmt” chunk - 特殊的数据格式
- a “data” chunk -包含实际数据
Wav 头文件
| 位置 | 值 | 描述 |
|---|---|---|
| 1 - 4 | “RIFF” | Marks the file as a riff file. Characters are each 1 byte long. |
| 5 - 8 | File size (integer) | Size of the overall file - 8 bytes, in bytes (32-bit integer). Typically, you’d fill this in after creation |
| 9 -12 | “WAVE” | File Type Header. For our purposes, it always equals “WAVE”. |
| 13-16 | “fmt " | Format chunk marker. Includes trailing null |
| 17-20 | 16 | Length of format data as listed above |
| 21-22 | 1 | Type of format (1 is PCM) - 2 byte integer |
| 23-24 | 2 | Number of Channels - 2 byte integer |
| 25-28 | 44100 | Sample Rate - 32 byte integer. Common values are 44100 (CD), 48000 (DAT). Sample Rate = Number of Samples per second, or Hertz. |
| 29-32 | 176400 | (Sample Rate * BitsPerSample * Channels) / 8. |
| 33-34 | 4 | (BitsPerSample * Channels) / 8.1 - 8 bit mono2 - 8 bit stereo/16 bit mono4 - 16 bit stereo |
| 35-36 | 16 | Bits per sample |
| 37-40 | “data” | “data” chunk header. Marks the beginning of the data section. |
| 41-44 | File size (data) | Size of the data section. |
python 构建 Wav 头文件
点击查看代码
def create_wav_header(audio_size: int, sampleRate:int, bits:int, channel:int):
header = b''
header += b"RIFF"
header += struct.pack('i', int(audio_size + 44 - 8))
header += b"WAVEfmt "
header += b'\x10\x00\x00\x00'
header += b'\x01\x00'
header += struct.pack('H', channel)
header += struct.pack('i', sampleRate)
header += struct.pack('i', int(sampleRate * bits / 8))
header += struct.pack('H', int(channel * bits / 8))
header += struct.pack('H', bits)
header += b'data'
header += struct.pack('i', audio_size)
return header