Re: [SoX-users] VOX conversion support in SOX

[Jan S. <ha...@st...>]

On Mar 09 16:32:10, Jie Wu wrote:
> I was trying to convert a OKI ADPCM audio file
> (http://www.nch.com.au/acm/sample.vox) using the following command:
> sox -t raw -r 8000 -c 1 -e oki-adpcm sample.vox test.wav
> 
> It always gives me "sox FAIL formats: bad input format for file
> `sample.vox': data encoding was not specified" error.

This is how soxi(1) sees the file:

$ soxi sample.vox
soxi WARN raw: `sample.vox': sample rate not specified; trying 8kHz

Input File     : 'sample.vox'
Channels       : 1
Sample Rate    : 8000
Precision      : 12-bit
Duration       : 00:00:04.40 = 35194 samples ~ 329.944 CDDA sectors
File Size      : 17.6k
Bit Rate       : 32.0k
Sample Encoding: 4-bit OKI ADPCM


Apparently, trying 8k is a good idea;
at least play(1) plays the file correctly:

$ play -V sample.vox gain -6
play: SoX v14.3.0
play WARN raw: `sample.vox': sample rate not specified; trying 8kHz

Input File     : 'sample.vox'
Channels       : 1
Sample Rate    : 8000
Precision      : 12-bit
Duration       : 00:00:04.40 = 35194 samples ~ 329.944 CDDA sectors
File Size      : 17.6k
Bit Rate       : 32.0k
Sample Encoding: 4-bit OKI ADPCM
Reverse Nibbles: no
Reverse Bits   : no


Output File    : 'default' (sndio)
Channels       : 1
Sample Rate    : 8000
Precision      : 16-bit
Duration       : 00:00:04.40 = 35194 samples ~ 329.944 CDDA sectors
Sample Encoding: 16-bit Signed Integer PCM
Endian Type    : little
Reverse Nibbles: no
Reverse Bits   : no

play INFO sox: effects chain: input      8000Hz 1 channels
play INFO sox: effects chain: gain       8000Hz 1 channels
play INFO sox: effects chain: dither     8000Hz 1 channels
play INFO sox: effects chain: output     8000Hz 1 channels
In:23.3% 00:00:01.02 [00:00:03.38] Out:8.19k [ =====|===== ]
Clip:0 


I don't understand why you are specifying the encoding, channels, etc.
It's all in the vox header (except the rate is not, but sox guesses
it correctly as 8k). The easiest possible thing just works:

$ sox -V sample.vox sample.wav 
sox: SoX v14.3.0
sox WARN raw: `sample.vox': sample rate not specified; trying 8kHz

Input File     : 'sample.vox'
Channels       : 1
Sample Rate    : 8000
Precision      : 12-bit
Duration       : 00:00:04.40 = 35194 samples ~ 329.944 CDDA sectors
File Size      : 17.6k
Bit Rate       : 32.0k
Sample Encoding: 4-bit OKI ADPCM
Reverse Nibbles: no
Reverse Bits   : no

Output File    : 'sample.wav'
Channels       : 1
Sample Rate    : 8000
Precision      : 12-bit
Duration       : 00:00:04.40 = 35194 samples ~ 329.944 CDDA sectors
Sample Encoding: 16-bit Signed Integer PCM
Endian Type    : little
Reverse Nibbles: no
Reverse Bits   : no
Comment        : 'Processed by SoX'

sox INFO sox: effects chain: input      8000Hz 1 channels
sox INFO sox: effects chain: output     8000Hz 1 channels
sox WARN adpcms: sample.vox: ADPCM state errors: 8

The resulting sample.wav sounds just fine.
(Don't know what "ADPCM state errors" are, though.)

	Jan