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volume: Print a warning when volume is clipped in pa_sw_volume_multiply/divide()

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When the volume exceeds PA_VOLUME_MAX in pa_sw_volume_multiply() or
pa_sw_volume_divide(), volume settings are insanely high and the
user should be notified about it.

This patch adds volume clamping to pa_sw_volume_divide() and prints
a warning when the volume is clipped in both functions.
This commit is contained in:
Georg Chini 2017-04-29 10:12:01 +02:00
parent d985276c8b
commit be1276d816
1 changed files with 14 additions and 2 deletions
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16
src/pulse/volume.c
View file

@ -199,16 +199,23 @@ pa_volume_t pa_cvolume_min_mask(const pa_cvolume *a, const pa_channel_map *cm, p
}
pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
uint64_t result;
pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID);
pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID);
/* cbrt((a/PA_VOLUME_NORM)^3*(b/PA_VOLUME_NORM)^3)*PA_VOLUME_NORM = a*b/PA_VOLUME_NORM */
return (pa_volume_t) PA_CLAMP_VOLUME((((uint64_t) a * (uint64_t) b + (uint64_t) PA_VOLUME_NORM / 2ULL) / (uint64_t) PA_VOLUME_NORM));
result = ((uint64_t) a * (uint64_t) b + (uint64_t) PA_VOLUME_NORM / 2ULL) / (uint64_t) PA_VOLUME_NORM;
if (result > (uint64_t)PA_VOLUME_MAX)
pa_log_warn("pa_sw_volume_multiply: Volume exceeds maximum allowed value and will be clipped. Please check your volume settings.");
return (pa_volume_t) PA_CLAMP_VOLUME(result);
}
pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) {
uint64_t result;
pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID);
pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID);
@ -216,7 +223,12 @@ pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) {
if (b <= PA_VOLUME_MUTED)
return 0;
return (pa_volume_t) (((uint64_t) a * (uint64_t) PA_VOLUME_NORM + (uint64_t) b / 2ULL) / (uint64_t) b);
result = ((uint64_t) a * (uint64_t) PA_VOLUME_NORM + (uint64_t) b / 2ULL) / (uint64_t) b;
if (result > (uint64_t)PA_VOLUME_MAX)
pa_log_warn("pa_sw_volume_divide: Volume exceeds maximum allowed value and will be clipped. Please check your volume settings.");
return (pa_volume_t) PA_CLAMP_VOLUME(result);
}
/* Amplitude, not power */