ペアリングしたスピーカーのボリュームを操作する
コマンドラインから音声出力のボリュームを指定する。
$ amixer
Simple mixer control 'SPEAKER - A2DP',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 46 [36%] [on]
Front Right: Playback 46 [36%] [on]
Simple mixer control 'SPEAKER - SCO',0
Capabilities: pvolume pvolume-joined cvolume cvolume-joined pswitch pswitch-joined cswitch cswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: Playback 0 - 15 Capture 0 - 15
Mono: Playback 15 [100%] [on] Capture 15 [100%] [on]
$ amixer -D bluealsa sset 'SPEAKER - A2DP' 50%
Simple mixer control 'SPEAKER - A2DP',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 64 [50%] [on]
Front Right: Playback 64 [50%] [on]
$ amixer
Simple mixer control 'SPEAKER - A2DP',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 46 [36%] [on]
Front Right: Playback 46 [36%] [on]
Simple mixer control 'SPEAKER - SCO',0
Capabilities: pvolume pvolume-joined cvolume cvolume-joined pswitch pswitch-joined cswitch cswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: Playback 0 - 15 Capture 0 - 15
Mono: Playback 15 [100%] [on] Capture 15 [100%] [on]
$ amixer -D bluealsa sset 'SPEAKER - A2DP' 50%
Simple mixer control 'SPEAKER - A2DP',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 64 [50%] [on]
Front Right: Playback 64 [50%] [on]
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