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Minor changes to man pages.

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Mike Brady
2015-10-17 11:05:19 +01:00
parent f30d224987
commit 7266dacd0d
2 changed files with 8 additions and 4 deletions
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man/shairport-sync.7
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@@ -100,7 +100,7 @@ Use this to specify how much debugging information should be output or logged. "
Set this \fIchoice\f1 to "yes" if you want the volume to be at 100% no matter what the source's volume control is set to. This might be useful if you want to set the volume on the output device, independently of the setting at the source. The default is "no".
.TP
\fBvolume_range_db=\f1\fIdBvalue\f1\fB;\f1
Set this \fIdBvalue\f1 to use just a portion of the full range of attenuation offered by a mixer. For example, if a mixer has a minimum volume of -80 dB and a maximum of +20 dB, you might wish to use only 60 dB of the 100 dB available. This might be because the sound becomes inaudible at the lowest setting and unbearably loud at the highest setting. Or it might be because the range specified by the mixer does not match the capabilities of the device. For example, the Raspberry Pi's DAC that feeds the built-in audio jack claims a range of 106 dB but has a useful range of only about 35dB. The setting allows you to specify the maximum range from highest to lowest. Many domestic HiFi systems have a range of 60 to 80 dB. The range suggested for the Raspberry Pi's built-in audio DAC, which feeds the headphone jack, is 35. Using it in this case gives the volume control a much more useful range of settings. If you omit this setting, the full "native" range of the output device is used.
Set this \fIdBvalue\f1 to use just a portion of the full range of attenuation offered by a mixer. For example, if a mixer has a minimum volume of -80 dB and a maximum of +20 dB, you might wish to use only 60 dB of the 100 dB available. This might be because the sound becomes inaudible at the lowest setting and unbearably loud at the highest setting -- indeed, many domestic HiFi systmes have a volume copntrol range of just 60 to 80dB. Another potential use might be where the range specified by the mixer does not match the capabilities of the device. For example, the Raspberry Pi's DAC that feeds the built-in audio jack claims a range of 106 dB but has a useful range of only about 35dB. The setting allows you to specify the maximum range from highest to lowest. The range suggested for the Raspberry Pi's built-in audio DAC, which feeds the headphone jack, is 35. Using it in this case gives the volume control a much more useful range of settings. If you omit this setting, the full "native" range of the mixer is used.
.TP
\fB"ALSA" SETTINGS\f1
These settings are for the ALSA back end, used to communicate with audio output devices in the ALSA system. (By the way, you can use tools such as \fBalsamixer\f1 or \fBaplay\f1 to discover what devices are available.) Use these settings to select the output device and the mixer control to be used to control the output volume. You can additionally set the desired size of the output buffer and you can adjust overall latency. Here are the \fBalsa\f1 group settings:
man/shairport-sync.html
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<p><b>volume_range_db=</b><em>dBvalue</em><b>;</b></p>
Set this <em>dBvalue</em> to use just a portion of the full range of attenuation offered by a mixer. For example, if a mixer has a minimum volume of -80 dB and a maximum of +20 dB, you might wish to use only 60 dB of the 100 dB available. This might be because the sound becomes inaudible at the lowest setting and unbearably loud at the highest setting. Or it might be because the range specified by the mixer does not match the capabilities of the device. For example, the Raspberry Pi's DAC that feeds the built-in audio jack claims a range of 106 dB but has a useful range of only about 35dB. The setting allows you to specify the maximum range from highest to lowest. Many domestic HiFi systems have a range of 60 to 80 dB. The range suggested for the Raspberry Pi's built-in audio DAC, which feeds the headphone jack, is 35. Using it in this case gives the volume control a much more useful range of settings. If you omit this setting, the full &quot;native&quot; range of the output device is used.
Set this <em>dBvalue</em> to use just a portion of the full range of attenuation offered by a mixer.
For example, if a mixer has a minimum volume of -80 dB and a maximum of +20 dB, you might wish to use only 60 dB of the 100 dB available.
This might be because the sound becomes inaudible at the lowest setting and unbearably loud at the highest setting -- indeed, many domestic HiFi systmes have a volume copntrol range of just 60 to 80dB.
Another potential use might be where the range specified by the mixer does not match the capabilities of the device.
For example, the Raspberry Pi's DAC that feeds the built-in audio jack claims a range of 106 dB but has a useful range of only about 35dB.
The setting allows you to specify the maximum range from highest to lowest. The range suggested for the Raspberry Pi's built-in audio DAC, which feeds the headphone jack, is 35.
Using it in this case gives the volume control a much more useful range of settings. If you omit this setting, the full &quot;native&quot; range of the mixer is used.
<p><b>&quot;ALSA&quot; SETTINGS</b></p>
<p>These settings are for the ALSA back end, used to communicate with audio output devices in the ALSA system.