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module-raop-sink: Fix volume calculation

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The volume interval that RAOP devices understand is [-30,0],
where -30.0 equals min vol, and 0.0 equals max. vol.

The local system volume is represented as a cubic (volumetric)
value in the [0,1] interval.

So cube root system volume value, scale by 30 and
translate -30 to map to target output range.

The special value -144 denotes volume mute. Send a corresponding RTSP
message when mute is not already toggled on.
This commit is contained in:
Christian Glombek 2023-10-03 07:15:17 +02:00
parent 5d0e82be7e
commit c5cc364794
1 changed files with 8 additions and 4 deletions
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12
src/modules/module-raop-sink.c
View file

@ -148,9 +148,9 @@ PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
#define DEFAULT_CHANNELS 2
#define DEFAULT_POSITION "[ FL FR ]"
#define VOLUME_MAX 0.0
#define VOLUME_DEF -30.0
#define VOLUME_MIN -144.0
#define VOLUME_MAX 0.0
#define VOLUME_MIN -30.0
#define VOLUME_MUTE -144.0
#define MODULE_USAGE "( raop.ip=<ip address of host> ) " \
"( raop.port=<remote port> ) " \
@ -1723,6 +1723,10 @@ static void stream_props_changed(struct impl *impl, uint32_t id, const struct sp
{
bool mute;
if (spa_pod_get_bool(&prop->value, &mute) == 0) {
if (!impl->mute) {
impl->volume = VOLUME_MUTE;
rtsp_send_volume(impl);
}
impl->mute = mute;
}
spa_pod_builder_prop(&b, SPA_PROP_softMute, 0);
@ -1744,7 +1748,7 @@ static void stream_props_changed(struct impl *impl, uint32_t id, const struct sp
soft_vols[i] = 1.0f;
}
volume /= n_vols;
volume = SPA_CLAMPF(20.0 * log10(volume), VOLUME_MIN, VOLUME_MAX);
volume = SPA_CLAMPF(cbrt(volume) * 30 - 30, VOLUME_MIN, VOLUME_MAX);
impl->volume = volume;
rtsp_send_volume(impl);