code.delx.au - pulseaudio/blob - src/sample.c

   1 #include <assert.h>
   2
   3 #include "sample.h"
   4
   5 size_t pa_sample_size(struct pa_sample_spec *spec) {
   6     assert(spec);
   7     size_t b = 1;
   8
   9     switch (spec->format) {
  10         case SAMPLE_U8:
  11         case SAMPLE_ULAW:
  12         case SAMPLE_ALAW:
  13             b = 1;
  14             break;
  15         case SAMPLE_S16LE:
  16         case SAMPLE_S16BE:
  17             b = 2;
  18             break;
  19         case SAMPLE_FLOAT32:
  20             b = 4;
  21             break;
  22     }
  23
  24     return b * spec->channels;
  25 }
  26
  27 size_t pa_bytes_per_second(struct pa_sample_spec *spec) {
  28     assert(spec);
  29     return spec->rate*pa_sample_size(spec);
  30 }
  31
  32
  33 uint32_t pa_samples_usec(size_t length, struct pa_sample_spec *spec) {
  34     assert(spec);
  35
  36     return (uint32_t) (((double) length /pa_sample_size(spec))/spec->rate*1000000);
  37 }