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alsa: make displayed ALSA volume match PulseAudio volume

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This is the same behavior as `apulse`, for example, and is more clear for users.
This commit is contained in:
anteater 2023-01-18 22:11:10 +00:00 • committed by Wim Taymans
parent 6af85f2371
commit 057a6c490b
1 changed files with 21 additions and 2 deletions
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23
pipewire-alsa/alsa-plugins/ctl_pipewire.c
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@ -38,6 +38,25 @@ PW_LOG_TOPIC_STATIC(alsa_log_topic, "alsa.ctl");
#define PW_LOG_TOPIC_DEFAULT alsa_log_topic
#define VOLUME_MAX 65536
#define VOLUME_MUTED ((uint32_t) 0U)
#define VOLUME_NORM ((uint32_t) 0x10000U)
static inline uint32_t volume_from_linear(float vol)
{
uint32_t v;
if (vol <= 0.0f)
v = VOLUME_MUTED;
else
v = SPA_CLAMP((uint64_t) lround(cbrt(vol) * VOLUME_NORM),
VOLUME_MUTED, VOLUME_MAX);
return v;
}
static inline float volume_to_linear(uint32_t vol)
{
float v = ((float)vol) / VOLUME_NORM;
return v * v * v;
}
struct volume {
uint32_t channels;
@ -490,7 +509,7 @@ static struct spa_pod *build_volume_mute(struct spa_pod_builder *b, struct volum
n_volumes = volume->channels;
for (i = 0; i < n_volumes; i++)
volumes[i] = volume->values[i] / (float) VOLUME_MAX;
volumes[i] = volume_to_linear(volume->values[i]);
spa_pod_builder_prop(b, SPA_PROP_channelVolumes, 0);
spa_pod_builder_array(b, sizeof(float),
@ -844,7 +863,7 @@ static void parse_props(struct global *g, const struct spa_pod *param, bool devi
g->node.channel_volume.channels = n_volumes;
for (i = 0; i < n_volumes; i++)
g->node.channel_volume.values[i] = volumes[i] * VOLUME_MAX;
g->node.channel_volume.values[i] = volume_from_linear(volumes[i]);
SPA_FLAG_UPDATE(g->node.flags, NODE_FLAG_DEVICE_VOLUME, device);
pw_log_debug("update node %d channelVolumes", g->id);