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Some devices have a hardware volume control, but not a dedicated hardware mute control. In some of these cases, the volume control is described as having a hardware mute when volume is 0. This is described in the TLV information of the volume control, when the SNDRV_CTL_TLVD_DB_SCALE_MUTE flag is set in the TLV structure. If set, alsa-lib will set the minimum dB value to -99999.99dB, which can be detected inside PipeWire. PipeWire can then use this hardware volume control to apply hardware mute, when set. In order to be able to set volumes and mutes separately, changing the volume whilst muted will save the value, but not write it to the hardware. When the device is unmuted, the saved value will be restored. Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com> |
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| .. | ||
| acp.c | ||
| acp.h | ||
| alsa-mixer.c | ||
| alsa-mixer.h | ||
| alsa-ucm.c | ||
| alsa-ucm.h | ||
| alsa-util.c | ||
| alsa-util.h | ||
| array.h | ||
| card.h | ||
| channelmap.h | ||
| compat.c | ||
| compat.h | ||
| conf-parser.c | ||
| conf-parser.h | ||
| device-port.h | ||
| dynarray.h | ||
| hashmap.h | ||
| idxset.h | ||
| llist.h | ||
| meson.build | ||
| proplist.h | ||
| volume.h | ||