linux alsa 音量参数

系统集成了aplay和mplay，但这个两个播放器都没有设置音量的参数，为了调节音量，查到了amixer指令
查看help，以开阳1668为例，支持如下功能：

$ amixer -help
Usage: amixer <options> [command]Available options:-h,--help       this help-c,--card N     select the card-D,--device N   select the device, default 'default'-d,--debug      debug mode-n,--nocheck    do not perform range checking-v,--version    print version of this program-q,--quiet      be quiet-i,--inactive   show also inactive controls-a,--abstract L select abstraction level (none or basic)-s,--stdin      Read and execute commands from stdin sequentially-R,--raw-volume Use the raw value (default)-M,--mapped-volume Use the mapped volumeAvailable commands:scontrols       show all mixer simple controlsscontents       show contents of all mixer simple controls (default command)sset sID P      set contents for one mixer simple controlsget sID        get contents for one mixer simple controlcontrols        show all controls for given cardcontents        show contents of all controls for given cardcset cID P      set control contents for one controlcget cID        get control contents for one control

查看驱动里面已经提供了多少接口可以去操作，可以用命令：amixer controls

$ amixer controls
numid=3,iface=MIXER,name='EQ Bass'
numid=4,iface=MIXER,name='EQ BassF0'
numid=5,iface=MIXER,name='EQ BassQ'
numid=6,iface=MIXER,name='EQ Middle'
numid=7,iface=MIXER,name='EQ MiddleF0'
numid=8,iface=MIXER,name='EQ MiddleQ'
numid=9,iface=MIXER,name='EQ Treble'
numid=10,iface=MIXER,name='EQ TrebleF0'
numid=11,iface=MIXER,name='EQ TrebleQ'
numid=1,iface=MIXER,name='Left Playback Volume'
numid=15,iface=MIXER,name='PA Fader-FL'
numid=16,iface=MIXER,name='PA Fader-FR'
numid=17,iface=MIXER,name='PA Fader-RL'
numid=18,iface=MIXER,name='PA Fader-RR'
numid=19,iface=MIXER,name='PA Fader-Sub1'
numid=20,iface=MIXER,name='PA Fader-Sub2'
numid=13,iface=MIXER,name='PA Input Select'
numid=14,iface=MIXER,name='PA Input-Full-Diff-Type Select'
numid=12,iface=MIXER,name='PA Input-Gain'
numid=24,iface=MIXER,name='PA Loudness'
numid=26,iface=MIXER,name='PA Loudness-F0 Select'
numid=25,iface=MIXER,name='PA Loudness-HiCut Select'
numid=27,iface=MIXER,name='PA Mixing-CH1 Switch'
numid=28,iface=MIXER,name='PA Mixing-CH2 Switch'
numid=29,iface=MIXER,name='PA Mixing-Input Select'
numid=21,iface=MIXER,name='PA Mute'
numid=22,iface=MIXER,name='PA Reset'
numid=30,iface=MIXER,name='PA Sub-Input Select'
numid=31,iface=MIXER,name='PA Sub-LPF-FC Select'
numid=32,iface=MIXER,name='PA Sub-LPF-Parse Select'
numid=33,iface=MIXER,name='PA Sub-Output Select'
numid=23,iface=MIXER,name='PA Volume'
numid=2,iface=MIXER,name='Right Playback Volume'

查看所有配置的值，可以通过这个查看：amixer contents

$ amixer contents
numid=3,iface=MIXER,name='EQ Bass'; type=INTEGER,access=rw------,values=1,min=0,max=30,step=0: values=15
numid=4,iface=MIXER,name='EQ BassF0'; type=ENUMERATED,access=rw------,values=1,items=4; Item #0 'BASS_F0:60HZ'; Item #1 'BASS_F0:80HZ'; Item #2 'BASS_F0:100HZ'; Item #3 'BASS_F0:120HZ': values=0
numid=5,iface=MIXER,name='EQ BassQ'; type=ENUMERATED,access=rw------,values=1,items=4; Item #0 'BASS_Q:0.5'; Item #1 'BASS_Q:1.0'; Item #2 'BASS_Q:1.5'; Item #3 'BASS_Q:2.0': values=0
numid=6,iface=MIXER,name='EQ Middle'; type=INTEGER,access=rw------,values=1,min=0,max=30,step=0: values=15
numid=7,iface=MIXER,name='EQ MiddleF0'; type=ENUMERATED,access=rw------,values=1,items=4; Item #0 'MIDDLE_F0:0.5KHZ'; Item #1 'MIDDLE_F0:1KHZ'; Item #2 'MIDDLE_F0:1.5KHZ'; Item #3 'MIDDLE_F0:2.5KHZ': values=0
numid=8,iface=MIXER,name='EQ MiddleQ'; type=ENUMERATED,access=rw------,values=1,items=4; Item #0 'MIDDLE_Q:0.75'; Item #1 'MIDDLE_Q:1.00'; Item #2 'MIDDLE_Q:1.25'; Item #3 'MIDDLE_Q:1.50': values=0
numid=9,iface=MIXER,name='EQ Treble'; type=INTEGER,access=rw------,values=1,min=0,max=30,step=0: values=15
numid=10,iface=MIXER,name='EQ TrebleF0'; type=ENUMERATED,access=rw------,values=1,items=4; Item #0 'TREBLE_F0:7.5KHZ'; Item #1 'TREBLE_F0:10KHZ'; Item #2 'TREBLE_F0:12.5KHZ'; Item #3 'TREBLE_F0:15KHZ': values=0
numid=11,iface=MIXER,name='EQ TrebleQ'; type=ENUMERATED,access=rw------,values=1,items=2; Item #0 'TREBLE_Q:0.75'; Item #1 'TREBLE_Q:1.25': values=0
numid=1,iface=MIXER,name='Left Playback Volume'; type=INTEGER,access=rw------,values=1,min=0,max=127,step=0: values=127
numid=15,iface=MIXER,name='PA Fader-FL'; type=INTEGER,access=rw------,values=1,min=0,max=95,step=0: values=95
numid=16,iface=MIXER,name='PA Fader-FR'; type=INTEGER,access=rw------,values=1,min=0,max=95,step=0: values=0
numid=17,iface=MIXER,name='PA Fader-RL'; type=INTEGER,access=rw------,values=1,min=0,max=95,step=0: values=0
numid=18,iface=MIXER,name='PA Fader-RR'; type=INTEGER,access=rw------,values=1,min=0,max=95,step=0: values=0
numid=19,iface=MIXER,name='PA Fader-Sub1'; type=INTEGER,access=rw------,values=1,min=0,max=95,step=0: values=0
numid=20,iface=MIXER,name='PA Fader-Sub2'; type=INTEGER,access=rw------,values=1,min=0,max=95,step=0: values=0
numid=13,iface=MIXER,name='PA Input Select'; type=ENUMERATED,access=rw------,values=1,items=9; Item #0 'A_SINGLE'; Item #1 'B_SINGLE'; Item #2 'C_SINGLE:BT'; Item #3 'D_SINGLE:NAVI'; Item #4 'E1_SINGLE:RADIO'; Item #5 'E2_SINGLE:AUX'; Item #6 'D_DIFF:D'; Item #7 'E_FULL_DIFF:E1+E2'; Item #8 'INPUT_SHORT:ALL': values=3
numid=14,iface=MIXER,name='PA Input-Full-Diff-Type Select'; type=ENUMERATED,access=rw------,values=1,items=2; Item #0 'FULL_DIFF_TYPE:NEGATIVE INPUT'; Item #1 'FULL_DIFF_TYPE:BIAS': values=0
numid=12,iface=MIXER,name='PA Input-Gain'; type=INTEGER,access=rw------,values=1,min=0,max=16,step=0: values=0
numid=24,iface=MIXER,name='PA Loudness'; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0: values=0
numid=26,iface=MIXER,name='PA Loudness-F0 Select'; type=ENUMERATED,access=rw------,values=1,items=3; Item #0 'LOUDNESS_F0:400HZ'; Item #1 'LOUDNESS_F0:800HZ'; Item #2 'LOUDNESS_F0:2400HZ': values=1
numid=25,iface=MIXER,name='PA Loudness-HiCut Select'; type=ENUMERATED,access=rw------,values=1,items=4; Item #0 'HI_CUT:0'; Item #1 'HI_CUT:1'; Item #2 'HI_CUT:2'; Item #3 'HI_CUT:3': values=0
numid=27,iface=MIXER,name='PA Mixing-CH1 Switch'; type=ENUMERATED,access=rw------,values=1,items=2; Item #0 'ON'; Item #1 'OFF': values=0
numid=28,iface=MIXER,name='PA Mixing-CH2 Switch'; type=ENUMERATED,access=rw------,values=1,items=2; Item #0 'ON'; Item #1 'OFF': values=0
numid=29,iface=MIXER,name='PA Mixing-Input Select'; type=ENUMERATED,access=rw------,values=1,items=3; Item #0 'MIN'; Item #1 'A_SINGLE'; Item #2 'B_SINGLE': values=0
numid=21,iface=MIXER,name='PA Mute'; type=ENUMERATED,access=rw------,values=1,items=2; Item #0 'OFF'; Item #1 'ON': values=0
numid=22,iface=MIXER,name='PA Reset'; type=ENUMERATED,access=rw------,values=1,items=1; Item #0 'RESET': values=0
numid=30,iface=MIXER,name='PA Sub-Input Select'; type=ENUMERATED,access=rw------,values=1,items=2; Item #0 'LOUDNESS'; Item #1 'INPUT SELECTOR': values=0
numid=31,iface=MIXER,name='PA Sub-LPF-FC Select'; type=ENUMERATED,access=rw------,values=1,items=6; Item #0 'OFF'; Item #1 '55HZ'; Item #2 '85HZ'; Item #3 '120HZ'; Item #4 '160HZ'; Item #5 'PASS': values=0
numid=32,iface=MIXER,name='PA Sub-LPF-Parse Select'; type=ENUMERATED,access=rw------,values=1,items=2; Item #0 '0'; Item #1 '180': values=0
numid=33,iface=MIXER,name='PA Sub-Output Select'; type=ENUMERATED,access=rw------,values=1,items=4; Item #0 'LPF'; Item #1 'FRONT'; Item #2 'REAR'; Item #3 'SUBWOOFER': values=0
numid=23,iface=MIXER,name='PA Volume'; type=INTEGER,access=rw------,values=1,min=0,max=95,step=0: values=60
numid=2,iface=MIXER,name='Right Playback Volume'; type=INTEGER,access=rw------,values=1,min=0,max=127,step=0: values=127

要用get系列命令去看懂有哪些接口，然后再去用set系列的命令，去设置对应你所要设置的值

amixer cget
amixer cset

获取当前音量

主音量
amixer cget numid=34,iface=MIXER,name='softmaster'
numid=34,iface=MIXER,name='softmaster'; type=INTEGER,access=rw---RW-,values=2,min=0,max=127,step=0: values=50,50| dBscale-min=0.00dB,step=0.40dB,mute=0
左声道
amixer cget numid=1,iface=MIXER,name='Left Playback Volume'
numid=1,iface=MIXER,name='Left Playback Volume'; type=INTEGER,access=rw------,values=1,min=0,max=127,step=0: values=127
右声道
amixer cget numid=2,iface=MIXER,name='Right Playback Volume'
numid=2,iface=MIXER,name='Right Playback Volume'; type=INTEGER,access=rw------,values=1,min=0,max=127,step=0: values=127

设置音量

amixer cset numid=34,iface=MIXER,name='softmaster' 100
numid=34,iface=MIXER,name='softmaster'; type=INTEGER,access=rw---RW-,values=2,min=0,max=127,step=0: values=100,100| dBscale-min=0.00dB,step=0.40dB,mute=0

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