🚀 go-pugleaf

I have been dabbling with direct handling of audio buffers, and I have been
able to open PCM and GSM6.10 formats by specifying the correct WAVEFORMATEX
and GSM610WAVEFORMAT structures. As I delved deeper, I found loads of other
compression algorithms, including MPEGLAYER3 and TRUESPEECH. The problem I am
getting is that none of these other codecs open correctly with

  waveInOpen(&phwo,WAVE_MAPPER,&ptsp.wfx,(DWORD)WaveInProc,
                      (DWORD)this,CALLBACK_FUNCTION);

where I set up TRUESPEECHWAVEFORMAT ptsp structure as follows :-

    ptsp.wfx.cbSize=32; ptsp.wfx.wFormatTag=WAVE_FORMAT_DSPGROUP_TRUESPEECH;
    ptsp.wfx.nChannels=1; ptsp.wfx.nSamplesPerSec=8000;
ptsp.wfx.wBitsPerSample=0;
    ptsp.wfx.nAvgBytesPerSec=1067; ptsp.wfx.nBlockAlign=32;
ptsp.nSamplesPerBlock=240;

This is in accordance with the document at
http://www.csdn.net/dev/format/windows/wavec.htm

Why will this not open for input or output? I have checked that I have all of
these codecs enabled under Windows Multimedia system properties. Am I correct
in thinking that you can only waveInOpen codecs that can handle real-time
encoding?

If I use MPEGLAYER3, I can, under Windows XP SP1, open it with waveOutOpen,
but not waveInOpen. Why only for decoding MP3 audio, and not for encoding? Is
there some kind of copyright issue here? TIA,
-- 
Mark Jacobs
DK Computing
http://www.dkcomputing.co.uk
markj atty critical dotty co dotty uk