sad

simple audio daemon
git clone git://git.2f30.org/sad
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pcm.c (686B)

      1 #include <sys/select.h>
      2 
      3 #include <limits.h>
      4 #include <stdio.h>
      5 
      6 #include "sad.h"
      7 
      8 void s16monotostereo(short *in, short *out, size_t nsamples) {
      9   size_t i;
     10 
     11   for (i = 0; i < nsamples; i++) {
     12     out[i * 2] = in[i];
     13     out[i * 2 + 1] = in[i];
     14   }
     15 }
     16 
     17 void s16stereotomono(short *in, short *out, size_t nsamples) {
     18   size_t i;
     19 
     20   for (i = 0; i < nsamples; i++)
     21     out[i] = in[i * 2] / 2 + in[i * 2 + 1] / 2;
     22 }
     23 
     24 void s16tofloat(short *in, float *out, size_t nsamples) {
     25   size_t i;
     26 
     27   for (i = 0; i < nsamples; i++)
     28     out[i] = in[i] / 32768.f;
     29 }
     30 
     31 void floattos16(float *in, short *out, size_t nsamples) {
     32   size_t i;
     33 
     34   for (i = 0; i < nsamples; i++)
     35     out[i] = in[i] * 32768.f;
     36 }