code.delx.au - pulseaudio/blob - src/tests/voltest.c

   1 #include <stdio.h>
   2
   3 #include <pulse/volume.h>
   4 #include <pulse/gccmacro.h>
   5
   6 int main(int argc, char *argv[]) {
   7     pa_volume_t v;
   8     pa_cvolume cv;
   9     float b;
  10     pa_channel_map map;
  11
  12     printf("Attenuation of sample 1 against 32767: %g dB\n", 20.0*log10(1.0/32767.0));
  13     printf("Smallest possible attenutation > 0 applied to 32767: %li\n", lrint(32767.0*pa_sw_volume_to_linear(1)));
  14
  15     for (v = PA_VOLUME_MUTED; v <= PA_VOLUME_NORM*2; v += 256) {
  16
  17         double dB = pa_sw_volume_to_dB(v);
  18         double f = pa_sw_volume_to_linear(v);
  19
  20         printf("Volume: %3i; percent: %i%%; decibel %0.2f; linear = %0.2f; volume(decibel): %3i; volume(linear): %3i\n",
  21                v, (v*100)/PA_VOLUME_NORM, dB, f, pa_sw_volume_from_dB(dB), pa_sw_volume_from_linear(f));
  22     }
  23
  24     for (v = PA_VOLUME_MUTED; v <= PA_VOLUME_NORM*2; v += 256) {
  25         char s[PA_CVOLUME_SNPRINT_MAX], t[PA_SW_CVOLUME_SNPRINT_DB_MAX];
  26
  27         pa_cvolume_set(&cv, 2, v);
  28
  29         printf("Volume: %3i [%s] [%s]\n",
  30                v,
  31                pa_cvolume_snprint(s, sizeof(s), &cv),
  32                pa_sw_cvolume_snprint_dB(t, sizeof(t), &cv));
  33
  34     }
  35
  36     map.channels = cv.channels = 2;
  37     map.map[0] = PA_CHANNEL_POSITION_LEFT;
  38     map.map[1] = PA_CHANNEL_POSITION_RIGHT;
  39
  40     for (cv.values[0] = PA_VOLUME_MUTED; cv.values[0] <= PA_VOLUME_NORM*2; cv.values[0] += 4096)
  41         for (cv.values[1] = PA_VOLUME_MUTED; cv.values[1] <= PA_VOLUME_NORM*2; cv.values[1] += 4096) {
  42             char s[PA_CVOLUME_SNPRINT_MAX];
  43
  44             printf("Volume: [%s]; balance: %2.1f\n", pa_cvolume_snprint(s, sizeof(s), &cv), pa_cvolume_get_balance(&cv, &map));
  45         }
  46
  47     for (cv.values[0] = PA_VOLUME_MUTED+4096; cv.values[0] <= PA_VOLUME_NORM*2; cv.values[0] += 4096)
  48         for (cv.values[1] = PA_VOLUME_MUTED; cv.values[1] <= PA_VOLUME_NORM*2; cv.values[1] += 4096)
  49             for (b = -1.0f; b <= 1.0f; b += 0.2f) {
  50                 char s[PA_CVOLUME_SNPRINT_MAX];
  51                 pa_cvolume r;
  52                 float k;
  53
  54                 printf("Before: volume: [%s]; balance: %2.1f\n", pa_cvolume_snprint(s, sizeof(s), &cv), pa_cvolume_get_balance(&cv, &map));
  55
  56                 r = cv;
  57                 pa_cvolume_set_balance(&r, &map,b);
  58
  59                 k = pa_cvolume_get_balance(&r, &map);
  60                 printf("After: volume: [%s]; balance: %2.1f (intended: %2.1f) %s\n", pa_cvolume_snprint(s, sizeof(s), &r), k, b, k < b-.05 || k > b+.5 ? "MISMATCH" : "");
  61             }
  62
  63     return 0;
  64 }