and test .wav file is at http://gamma.cs.unc.edu/SOUNDC/Assignments/clapping!_2.wav
On Mon, Oct 26, 2009 at 5:50 PM, Drip Stone <[email protected]>wrote: > Hello again, > > I obtain data for fbuffer in following way: > char *fbuffer = ( char * ) malloc ( 10240000 ); //10M bytes > long length = fread ( fbuffer, 1, 10240000, file ); > > I also set alsa in float mode: > snd_pcm_hw_params_set_format ( handle, params, > > SND_PCM_FORMAT_FLOAT_LE ); > > I pasted all the code at http://pastebin.com/m7fdf0957. > > > Thank you, > Dripstone > > > > On Mon, Oct 26, 2009 at 3:59 PM, Jens M Andreasen < > [email protected]> wrote: > >> Nothing in the posted code fragment suggests that neither in nor out is >> remotely related to floats. Where do you get yor in-data from? Why is >> fbuffer[] a bytearray (if that is what it is?) How was ALSA opened? >> >> >> /j >> >> On Mon, 2009-10-26 at 15:05 -0700, Drip Stone wrote: >> >> > while ( 1 ) >> > { >> > for ( int i = 0; i < frames; i++ ) >> > { >> > float t = 0; >> > if ( left ) //for left channel >> > { >> > t = *((float*)&(fbuffer[pos+i*4])); //4 bytes each >> > frame >> > t*=2; >> > //printf("%f ",t); >> > for ( int j = 0; j < 4; j++ ) >> > buffer[i*8+j] = ((char*)&t)[j]; //8 bytes for 2 >> > channels >> > } >> > >> > rc = snd_pcm_writei ( handle, buffer, frames ); >> > pos += frames * 4; >> > } >> > >> > I think the value is not out of [-1.0,1.0]. BTW, what does it mean >> > when a value is negative? >> > >> > >> > Best, >> > Dripstone >> > >> > 2009/10/26 Jörn Nettingsmeier <[email protected]> >> > On 10/26/2009 11:38 AM, Victor Lazzarini wrote: >> > > Well if the audio was clipped, there would probably be some >> > audible >> > > distortion. >> > > Perhaps if a code fragment was posted we could give a more >> > informed >> > > opinion. >> > >> > >> > i was thinking of operating on files, where clamping can be >> > done with >> > perfect fidelity. but i may have misunderstood the OP. >> > >> > >> > _______________________________________________ >> > Linux-audio-dev mailing list >> > [email protected] >> > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev >> > >> > >> > _______________________________________________ >> > Linux-audio-dev mailing list >> > [email protected] >> > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev >> >> >
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