Converting RAW audio data to WAV with scripting

I was pointed to SoX by a friend, which did the trick. The syntax used was sox -r 44100 -e unsigned -b 8 -c 1 <RAW_FILE> <TARGET_FILE>

audioconvert is pretty standard (I think)

mencoder isn't available by standard in totally-free linux distributions, but can convert to about anything

MPlayer should be able to convert your audio;

$ mplayer \
  -quiet \
  -vo null \
  -vc dummy \
  -af volume=0,resample=44100:0:1 \
  -ao pcm:waveheader:file="file.wav" "file.raw"

It's available in most linux distributions package managers.

If you have a file name.txt which contains all the raw audio file names, then with python you can convert a batch of raw files to batch of wav.

from subprocess import call
file = "name.txt"
with open(file,'rU') as f:
     for name in f:
        name = name[:len(name)-4]
        name1 = './'+name+'raw' #input 
        name2 = './'+name+'wav' #output
        call(["sox","-r","48000", "-t", "sw", "-e", "signed", "-c", "1", "-b", "16", name1, name2])

sample rate 48K,mono channel, precision 16 bit.

You can use node-lame

 var Lame = require("node-lame").Lame;

 const decoder = new Lame({
        output: "./new.wav",
        raw: true,
        bitwidth:16,
        sfreq:48,
        mode: "m"
    }).setFile("./a.pcm");
    decoder.decode().then(() => {
            console.log("decoded successfully.");
        }).catch(error => {
            console.log("Error: "+error);
        });

https://www.npmjs.com/package/node-lame

Or using "sox" CLI tool

sox -r 48000 -t sw -e signed -c 1 -b 16 a.pcm new.wav

Let's use Sox, it's available pretty much everywhere.

On mac:

brew install sox

On Ubuntu (tested 18.04):

sudo apt update && sudo apt install sox -y

I tend to use 16k SR, 16-bit precision with encoding 16-bit Signed Integer PCM so will use those defaults. My files are .raw but could also be .pcm etc.

# assume you're in the directory with the raw wavs - we'll make a new wavs directory to put the converted ones
mkdir -p wavs

# 1-liner
for f in *.raw; do sox -r 16000 -e signed -b 16 -c 1 "$f" wavs/"${f%.*}.wav"; done

To check that the wav files have their header, use soxi:

rob@tp:~/wavs$ soxi test.wav 

Input File     : 'test.wav'
Channels       : 1
Sample Rate    : 16000
Precision      : 16-bit
Duration       : 00:00:12.62 = 201984 samples ~ 946.8 CDDA sectors
File Size      : 404k
Bit Rate       : 256k