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 PA_SAMPLE_U8:
  11         case PA_SAMPLE_ULAW:
  12         case PA_SAMPLE_ALAW:
  13             b = 1;
  14             break;
  15         case PA_SAMPLE_S16LE:
  16         case PA_SAMPLE_S16BE:
  17             b = 2;
  18             break;
  19         case PA_SAMPLE_FLOAT32:
  20             b = 4;
  21             break;
  22         default:
  23             assert(0);
  24     }
  25
  26     return b * spec->channels;
  27 }
  28
  29 size_t pa_bytes_per_second(struct pa_sample_spec *spec) {
  30     assert(spec);
  31     return spec->rate*pa_sample_size(spec);
  32 }
  33
  34
  35 uint32_t pa_samples_usec(size_t length, struct pa_sample_spec *spec) {
  36     assert(spec);
  37
  38     return (uint32_t) (((double) length /pa_sample_size(spec))/spec->rate*1000000);
  39 }
  40
  41 int pa_sample_spec_valid(struct pa_sample_spec *spec) {
  42     assert(spec);
  43
  44     if (!spec->rate || !spec->channels)
  45         return 0;
  46
  47     if (spec->format <= 0 || spec->format >= PA_SAMPLE_MAX)
  48         return 0;
  49
  50     return 1;
  51 }