Wav Header Parser #


Typescript module for parse wav file header

Features ##

- This module will parse the header of a wav file give in base64

Install ##

``
npm install wav-header-parser --save
`

How to use the module ##

`javascript
import {wavParser} from "wav-header-parser";
`

API ##

`javascript
wavParser(base64file: string): any
`

The result object will contain different values:
`
ChunkID: Contains the letters "RIFF" in ASCII form
ChunkSize: This is the size of the rest of the chunk following this number. This is the size of the entire file in bytes minus 8 bytes for the two fields not included in this count ChunkID and ChunkSize.
Format: Contains the letters "WAVE"
SubChunk1ID: Contains the letters "fmt "
SubChunk1Size: 16 for PCM. This is the size of the rest of the Subchunk which follows this number
AudioFormat: 1 is PCM. Values other than 1 indicate some form of compression
NumChannels: Mono = 1, Stereo = 2, etc
SampleRate: The sample rate (e.g: 8000kHz, 44100kHz, etc)
ByteRate: SampleRate NumChannels BitsPerSample/8
BlockAlign: (BitsPerSample * Channels) / 8 | 1 - 8 bit mono, 2 – 8 bit stereo/16 bit mono, 4 – 16 bit stereo
BitsPerSample: The number of bits (e.g: 16 = 16 bits)
SubChunk2ID: Contains the letters "data"
SubChunk2Size: NumSamples NumChannels BitsPerSample/8. This is the number of bytes in the data (After this header)
`

Usage ##


`javascript
let reader = new FileReader();

reader.onload = (ev) => {
if (ev.target) {
let waveFile = wavParser(ev.target.result);
console.log(waveFile.SampleRate);
}
};
reader.readAsDataURL(file);
``