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Update some slightly outdated comments in common.h and shairport-sync.conf

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This commit is contained in:
Mike Brady
2023-07-23 13:18:52 +02:00
parent b965add150
commit 8821ec2861
2 changed files with 10 additions and 7 deletions
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common.h
+5 -6
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@@ -391,13 +391,12 @@ uint8_t *rsa_apply(uint8_t *input, int inlen, int *outlen, int mode);
// dB), return an attenuation depending on a linear interpolation along the range
double flat_vol2attn(double vol, long max_db, long min_db);
// given a volume (0 to -30) and high and low attenuations in dB*100 (e.g. 0 to -6000 for 0 to -60
// dB), return an attenuation depending on a logarithmic interpolation along the range.
// The intention behind this attenuation function is that a given percentage change in volume
// should result in the same percentage change in perceived loudness. For instance, a doubling
// (100% increase) of volume level should result in a doubling of perceived loudness.
// The intention behind dasl_tapered is that a given percentage change in volume should result in the same percentage change in
// perceived loudness. For instance, doubling the volume level should result in doubling the perceived loudness.
// With the range of AirPlay volume being from -30 to 0, doubling the volume from -22.5 to -15 results in an increase of 10 dB.
// Similarly, doubling the volume from -15 to 0 results in an increase of 10 dB.
// For compatibility with mixers having a restricted attenuation range (e.g. 30 dB), "dasl_tapered" will switch to a flat profile at low AirPlay volumes.
double dasl_tapered_vol2attn(double vol, long max_db, long min_db);
// given a volume (0 to -30) and high and low attenuations in dB*100 (e.g. 0 to -6000 for 0 to -60
// dB), return an attenuation depending on the transfer function
double vol2attn(double vol, long max_db, long min_db);
scripts/shairport-sync.conf
+5 -1
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@@ -44,7 +44,11 @@ general =
// "flat" makes the volume change at the same rate at all volumes.
// "dasl_tapered" is similar to "standard" - it makes the volume change more quickly at lower volumes and slower at higher volumes.
// The intention behind dasl_tapered is that a given percentage change in volume should result in the same percentage change in
// perceived loudness. For instance, a doubling (100% increase) of volume level should result in a doubling of perceived loudness.
// perceived loudness. For instance, doubling the volume level should result in doubling the perceived loudness.
// With the range of AirPlay volume being from -30 to 0, doubling the volume from -22.5 to -15 results in an increase of 10 dB.
// Similarly, doubling the volume from -15 to 0 results in an increase of 10 dB.
// For compatibility with mixers having a restricted attenuation range (e.g. 30 dB), "dasl_tapered" will switch to a flat profile at low AirPlay volumes.
// volume_control_combined_hardware_priority = "no"; // when extending the volume range by combining the built-in software attenuator with the hardware mixer attenuator, set this to "yes" to reduce volume by using the hardware mixer first, then the built-in software attenuator.
// default_airplay_volume = -24.0; // this is the suggested volume after a reset or after the high_volume_threshold has been exceed and the high_volume_idle_timeout_in_minutes has passed