26 Oct
2009
26 Oct
'09
9:53 p.m.
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
<dripstone.blendercn(a)gmail.com>wrote;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 <
jens.andreasen(a)comhem.se> 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 <nettings(a)folkwang-hochschule.de>
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.
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