This is a little program to convert unplayable .WAV files recorded on some
Siemens phones. I stumbled upon this problem when testing Siemens A65 phone
(but it may be the case with other models too). This phone is able to record
sound from microphone to a WAV file and replay it (you can even use this WAV
file as a ringtone), but when you download these WAV files to a computer, no
program (even mplayer) is able to play them.
The problem is that these files are compressed by IMA ADPCM codec, but
contrary to the IMA ADPCM specification, the "bytes per block" and "samples
per block" fields in the file header are set to zero (for detailed
specification of the IMA ADPCM format, check this Word document:
http://abcavi.kibi.ru/docs/riff1.doc). After examining the file I found out
that it actually doesn't use blocks - it is encoded as one big block. I
couldn't find any audio converter program that is able to handle this format
- all have failed. So I had to write my own, using specs from the document
mentioned above.

The program is fairly simple. To use it type:

wavconv input.wav output.wav

on the DOS/Windows command line. "input.wav" is of course the name of the
file you want to convert, "output.wav" is the name of the resulting file
that the program will produce. It will be an uncompressed, 16 bit 8 kHz WAV
file (input files from the phone are 8 kHz 4 bit IMA ADPCM). Included file
"sample.wav" is a sample file recorded on the phone, and "output.wav" is the
output file from conversion.
As the program is written in Turbo Pascal for DOS, it doesn't understand
long Windows filenames. If you want to convert a file with a long name, you
must specify it's short name as "input.wav" (you can see the short name in
the leftmost column of the output from a "dir" command).

Included is also a "wavinfo" program, that will show you all the header data
from a WAV file. You use it by typing:

wavinfo file.wav

Source code is also included. There are two Turbo Pascal "units" (libraries)
used by the programs: wavhdr.pas and support.pas, and two source files for
the main programs: wavconv.pas and wavinfo.pas
The program is distributed under the GPL licence.

Jaroslaw Rafa
raj@ap.krakow.pl