On 18 Jul 2011, at 20:17, kmpir...@ece.upatras.gr wrote:
> I'm looking for a way to modify the alsa recording example found here
> http://www.linuxjournal.com/article/6735?page=0,2 and shown below (or use any
> other sample program you may suggest), in order to produce a wav file rather
> than send the buffer contents to the standard output. I want to do something
> very specific, so using the arecord utility is not an option for me. Any help?
converting a raw stream into a wav file is simply a question of putting a 44
byte wav header on at the begining of the file. This gives the sampling
frequency (44.1kHz), number of channels (2) and bytes per sample (2, or
possibly bits, I forget exactly); it also gives the duration for the recording
which you won't know until you have finished.
What I did many years ago to do this was to seek to 44 bytes (on an empty
output file) and record the raw data and then when I had finished, seek back to
the beginning and write the header.
The header format is well-documented and well-known: Google will find it easily.
jch
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