I had reason to playback some raw g.711 audio data. I made the following script to convert the data to a .au file that is playable.
From the AU file spec.. which is way simple by the way:
You just need to add 6 32-bit header flags.
import struct header = [ 0x2e736e64, 24, 0xffffffff, 1, 8000, 1 ] o=open('out.au','wb') o.write ( struct.pack ( ">IIIIII", *header ) ) raw = open('in.raw','rb').read() o.write(raw) o.close()
You can probably see that this would be extremely simple to use with other audio formats too. Modify as you need.
- Const AU identifier: 0x2e736e64
- Size of Header: 24.
- Size of File: use 0xffffffff for unknown, or you could replace with the actual size.
- Audio format. 1 is uLaw. From the spec choose whatever you need if it isn’t uLaw.
- Sample rate. uLaw is always 8000.
- Channels. 1 channel in this case.