amixer,aplay,arecord交叉編譯及使用

一.amixer用於控制設置 

amixer的幫助提示信息

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

Available commands:
  scontrols       show all mixer simple controls
  scontents       show contents of all mixer simple controls (default command)
  sset sID P      set contents for one mixer simple control
  sget sID        get contents for one mixer simple control
  controls        show all controls for given card
  contents        show contents of all controls for given card
  cset cID P      set control contents for one control
  cget cID        get control contents for one control

主要用到的命令參數有

controls:列出控制項

contents:列出控制上下文(也就是控制項和值)

cset cID P:設置控制項值

cget cID:獲取設置項值

使用方法:

1.先amixer controls列出所有控制項

numid=1,iface=MIXER,name='PCM Playback Volume'
numid=22,iface=MIXER,name='Line DAC Playback Volume'
numid=20,iface=MIXER,name='Line Line2 Bypass Volume'
numid=21,iface=MIXER,name='Line PGA Bypass Volume'
numid=32,iface=MIXER,name='Line Playback Switch'
numid=25,iface=MIXER,name='Mono DAC Playback Volume'
numid=23,iface=MIXER,name='Mono Line2 Bypass Volume'
numid=66,iface=MIXER,name='Mono Mixer DACL1 Switch'
numid=69,iface=MIXER,name='Mono Mixer DACR1 Switch'
numid=64,iface=MIXER,name='Mono Mixer Line2L Bypass Switch'
numid=67,iface=MIXER,name='Mono Mixer Line2R Bypass Switch'
numid=65,iface=MIXER,name='Mono Mixer PGAL Bypass Switch'
numid=68,iface=MIXER,name='Mono Mixer PGAR Bypass Switch'
numid=24,iface=MIXER,name='Mono PGA Bypass Volume'
numid=33,iface=MIXER,name='Mono Playback Switch'
numid=39,iface=MIXER,name='ADC HPF Cut-off'
numid=36,iface=MIXER,name='AGC Switch'
numid=28,iface=MIXER,name='HP DAC Playback Volume'
numid=26,iface=MIXER,name='HP Line2 Bypass Volume'
numid=27,iface=MIXER,name='HP PGA Bypass Volume'
numid=34,iface=MIXER,name='HP Playback Switch'
numid=31,iface=MIXER,name='HPCOM DAC Playback Volume'
numid=29,iface=MIXER,name='HPCOM Line2 Bypass Volume'
numid=30,iface=MIXER,name='HPCOM PGA Bypass Volume'
numid=35,iface=MIXER,name='HPCOM Playback Switch'
numid=101,iface=MIXER,name='Left DAC Mux'
numid=60,iface=MIXER,name='Left HP Mixer DACL1 Switch'
numid=10,iface=MIXER,name='Left HP Mixer DACR1 Playback Volume'
numid=63,iface=MIXER,name='Left HP Mixer DACR1 Switch'
numid=58,iface=MIXER,name='Left HP Mixer Line2L Bypass Switch'
numid=61,iface=MIXER,name='Left HP Mixer Line2R Bypass Switch'
numid=8,iface=MIXER,name='Left HP Mixer Line2R Bypass Volume'
numid=59,iface=MIXER,name='Left HP Mixer PGAL Bypass Switch'
numid=62,iface=MIXER,name='Left HP Mixer PGAR Bypass Switch'
numid=9,iface=MIXER,name='Left HP Mixer PGAR Bypass Volume'
numid=48,iface=MIXER,name='Left HPCOM Mixer DACL1 Switch'
numid=16,iface=MIXER,name='Left HPCOM Mixer DACR1 Playback Volume'
numid=51,iface=MIXER,name='Left HPCOM Mixer DACR1 Switch'
numid=46,iface=MIXER,name='Left HPCOM Mixer Line2L Bypass Switch'
numid=49,iface=MIXER,name='Left HPCOM Mixer Line2R Bypass Switch'
numid=14,iface=MIXER,name='Left HPCOM Mixer Line2R Bypass Volume'
numid=47,iface=MIXER,name='Left HPCOM Mixer PGAL Bypass Switch'
numid=50,iface=MIXER,name='Left HPCOM Mixer PGAR Bypass Switch'
numid=15,iface=MIXER,name='Left HPCOM Mixer PGAR Bypass Volume'
numid=100,iface=MIXER,name='Left HPCOM Mux'
numid=78,iface=MIXER,name='Left Line Mixer DACL1 Switch'
numid=4,iface=MIXER,name='Left Line Mixer DACR1 Playback Volume'
numid=81,iface=MIXER,name='Left Line Mixer DACR1 Switch'
numid=76,iface=MIXER,name='Left Line Mixer Line2L Bypass Switch'
numid=79,iface=MIXER,name='Left Line Mixer Line2R Bypass Switch'
numid=2,iface=MIXER,name='Left Line Mixer Line2R Bypass Volume'
numid=77,iface=MIXER,name='Left Line Mixer PGAL Bypass Switch'
numid=80,iface=MIXER,name='Left Line Mixer PGAR Bypass Switch'
numid=3,iface=MIXER,name='Left Line Mixer PGAR Bypass Volume'
numid=92,iface=MIXER,name='Left Line1L Mux'
numid=91,iface=MIXER,name='Left Line1R Mux'
numid=90,iface=MIXER,name='Left Line2L Mux'
numid=93,iface=MIXER,name='Left PGA Mixer Line1L Switch'
numid=94,iface=MIXER,name='Left PGA Mixer Line1R Switch'
numid=95,iface=MIXER,name='Left PGA Mixer Line2L Switch'
numid=96,iface=MIXER,name='Left PGA Mixer Mic3L Switch'
numid=97,iface=MIXER,name='Left PGA Mixer Mic3R Switch'
numid=38,iface=MIXER,name='PGA Capture Switch'
numid=37,iface=MIXER,name='PGA Capture Volume'
numid=99,iface=MIXER,name='Right DAC Mux'
numid=13,iface=MIXER,name='Right HP Mixer DACL1 Playback Volume'
numid=54,iface=MIXER,name='Right HP Mixer DACL1 Switch'
numid=57,iface=MIXER,name='Right HP Mixer DACR1 Switch'
numid=52,iface=MIXER,name='Right HP Mixer Line2L Bypass Switch'
numid=11,iface=MIXER,name='Right HP Mixer Line2L Bypass Volume'
numid=55,iface=MIXER,name='Right HP Mixer Line2R Bypass Switch'
numid=53,iface=MIXER,name='Right HP Mixer PGAL Bypass Switch'
numid=12,iface=MIXER,name='Right HP Mixer PGAL Bypass Volume'
numid=56,iface=MIXER,name='Right HP Mixer PGAR Bypass Switch'
numid=19,iface=MIXER,name='Right HPCOM Mixer DACL1 Playback Volume'
numid=42,iface=MIXER,name='Right HPCOM Mixer DACL1 Switch'
numid=45,iface=MIXER,name='Right HPCOM Mixer DACR1 Switch'
numid=40,iface=MIXER,name='Right HPCOM Mixer Line2L Bypass Switch'
numid=17,iface=MIXER,name='Right HPCOM Mixer Line2L Bypass Volume'
numid=43,iface=MIXER,name='Right HPCOM Mixer Line2R Bypass Switch'
numid=41,iface=MIXER,name='Right HPCOM Mixer PGAL Bypass Switch'
numid=18,iface=MIXER,name='Right HPCOM Mixer PGAL Bypass Volume'
numid=44,iface=MIXER,name='Right HPCOM Mixer PGAR Bypass Switch'
numid=98,iface=MIXER,name='Right HPCOM Mux'
numid=7,iface=MIXER,name='Right Line Mixer DACL1 Playback Volume'
numid=72,iface=MIXER,name='Right Line Mixer DACL1 Switch'
numid=75,iface=MIXER,name='Right Line Mixer DACR1 Switch'
numid=70,iface=MIXER,name='Right Line Mixer Line2L Bypass Switch'
numid=5,iface=MIXER,name='Right Line Mixer Line2L Bypass Volume'
numid=73,iface=MIXER,name='Right Line Mixer Line2R Bypass Switch'
numid=71,iface=MIXER,name='Right Line Mixer PGAL Bypass Switch'
numid=6,iface=MIXER,name='Right Line Mixer PGAL Bypass Volume'
numid=74,iface=MIXER,name='Right Line Mixer PGAR Bypass Switch'
numid=84,iface=MIXER,name='Right Line1L Mux'
numid=83,iface=MIXER,name='Right Line1R Mux'
numid=82,iface=MIXER,name='Right Line2R Mux'
numid=86,iface=MIXER,name='Right PGA Mixer Line1L Switch'
numid=85,iface=MIXER,name='Right PGA Mixer Line1R Switch'
numid=87,iface=MIXER,name='Right PGA Mixer Line2R Switch'
numid=88,iface=MIXER,name='Right PGA Mixer Mic3L Switch'
numid=89,iface=MIXER,name='Right PGA Mixer Mic3R Switch'

2.如果對控制項不熟悉或者想查看當前的所有配置可以使用amixer contents

numid=1,iface=MIXER,name='PCM Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=127,step=0
  : values=64,64
  | dBscale-min=-63.50dB,step=0.50dB,mute=0
numid=22,iface=MIXER,name='Line DAC Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=20,iface=MIXER,name='Line Line2 Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=21,iface=MIXER,name='Line PGA Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=32,iface=MIXER,name='Line Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=25,iface=MIXER,name='Mono DAC Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=23,iface=MIXER,name='Mono Line2 Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=66,iface=MIXER,name='Mono Mixer DACL1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=69,iface=MIXER,name='Mono Mixer DACR1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=64,iface=MIXER,name='Mono Mixer Line2L Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=67,iface=MIXER,name='Mono Mixer Line2R Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=65,iface=MIXER,name='Mono Mixer PGAL Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=68,iface=MIXER,name='Mono Mixer PGAR Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=24,iface=MIXER,name='Mono PGA Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=33,iface=MIXER,name='Mono Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=39,iface=MIXER,name='ADC HPF Cut-off'
  ; type=ENUMERATED,access=rw------,values=2,items=4
  ; Item #0 'Disabled'
  ; Item #1 '0.0045xFs'
  ; Item #2 '0.0125xFs'
  ; Item #3 '0.025xFs'
  : values=0,0
numid=36,iface=MIXER,name='AGC Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=28,iface=MIXER,name='HP DAC Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=26,iface=MIXER,name='HP Line2 Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=27,iface=MIXER,name='HP PGA Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=34,iface=MIXER,name='HP Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=31,iface=MIXER,name='HPCOM DAC Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=29,iface=MIXER,name='HPCOM Line2 Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=30,iface=MIXER,name='HPCOM PGA Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=118,step=0
  : values=71,71
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=35,iface=MIXER,name='HPCOM Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=101,iface=MIXER,name='Left DAC Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'DAC_L1'
  ; Item #1 'DAC_L3'
  ; Item #2 'DAC_L2'
  : values=2
numid=60,iface=MIXER,name='Left HP Mixer DACL1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=10,iface=MIXER,name='Left HP Mixer DACR1 Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=63,iface=MIXER,name='Left HP Mixer DACR1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=58,iface=MIXER,name='Left HP Mixer Line2L Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=61,iface=MIXER,name='Left HP Mixer Line2R Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=8,iface=MIXER,name='Left HP Mixer Line2R Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=59,iface=MIXER,name='Left HP Mixer PGAL Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=62,iface=MIXER,name='Left HP Mixer PGAR Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=9,iface=MIXER,name='Left HP Mixer PGAR Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=48,iface=MIXER,name='Left HPCOM Mixer DACL1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=16,iface=MIXER,name='Left HPCOM Mixer DACR1 Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=51,iface=MIXER,name='Left HPCOM Mixer DACR1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=46,iface=MIXER,name='Left HPCOM Mixer Line2L Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=49,iface=MIXER,name='Left HPCOM Mixer Line2R Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=14,iface=MIXER,name='Left HPCOM Mixer Line2R Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=47,iface=MIXER,name='Left HPCOM Mixer PGAL Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=50,iface=MIXER,name='Left HPCOM Mixer PGAR Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=15,iface=MIXER,name='Left HPCOM Mixer PGAR Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=100,iface=MIXER,name='Left HPCOM Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'differential of HPLOUT'
  ; Item #1 'constant VCM'
  ; Item #2 'single-ended'
  : values=0
numid=78,iface=MIXER,name='Left Line Mixer DACL1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=4,iface=MIXER,name='Left Line Mixer DACR1 Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=81,iface=MIXER,name='Left Line Mixer DACR1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=76,iface=MIXER,name='Left Line Mixer Line2L Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=79,iface=MIXER,name='Left Line Mixer Line2R Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=2,iface=MIXER,name='Left Line Mixer Line2R Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=77,iface=MIXER,name='Left Line Mixer PGAL Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=80,iface=MIXER,name='Left Line Mixer PGAR Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=3,iface=MIXER,name='Left Line Mixer PGAR Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=92,iface=MIXER,name='Left Line1L Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'single-ended'
  ; Item #1 'differential'
  : values=0
numid=91,iface=MIXER,name='Left Line1R Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'single-ended'
  ; Item #1 'differential'
  : values=0
numid=90,iface=MIXER,name='Left Line2L Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'single-ended'
  ; Item #1 'differential'
  : values=0
numid=93,iface=MIXER,name='Left PGA Mixer Line1L Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=94,iface=MIXER,name='Left PGA Mixer Line1R Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=95,iface=MIXER,name='Left PGA Mixer Line2L Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=96,iface=MIXER,name='Left PGA Mixer Mic3L Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=97,iface=MIXER,name='Left PGA Mixer Mic3R Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=38,iface=MIXER,name='PGA Capture Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=37,iface=MIXER,name='PGA Capture Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=119,step=0
  : values=32,32
  | dBscale-min=0.00dB,step=0.50dB,mute=0
numid=99,iface=MIXER,name='Right DAC Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'DAC_R1'
  ; Item #1 'DAC_R3'
  ; Item #2 'DAC_R2'
  : values=2
numid=13,iface=MIXER,name='Right HP Mixer DACL1 Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=54,iface=MIXER,name='Right HP Mixer DACL1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=57,iface=MIXER,name='Right HP Mixer DACR1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=52,iface=MIXER,name='Right HP Mixer Line2L Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=11,iface=MIXER,name='Right HP Mixer Line2L Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=55,iface=MIXER,name='Right HP Mixer Line2R Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=53,iface=MIXER,name='Right HP Mixer PGAL Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=12,iface=MIXER,name='Right HP Mixer PGAL Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=56,iface=MIXER,name='Right HP Mixer PGAR Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=19,iface=MIXER,name='Right HPCOM Mixer DACL1 Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=42,iface=MIXER,name='Right HPCOM Mixer DACL1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=45,iface=MIXER,name='Right HPCOM Mixer DACR1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=40,iface=MIXER,name='Right HPCOM Mixer Line2L Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=17,iface=MIXER,name='Right HPCOM Mixer Line2L Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=116
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=43,iface=MIXER,name='Right HPCOM Mixer Line2R Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=41,iface=MIXER,name='Right HPCOM Mixer PGAL Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=18,iface=MIXER,name='Right HPCOM Mixer PGAL Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=44,iface=MIXER,name='Right HPCOM Mixer PGAR Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=98,iface=MIXER,name='Right HPCOM Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=5
  ; Item #0 'differential of HPROUT'
  ; Item #1 'constant VCM'
  ; Item #2 'single-ended'
  ; Item #3 'differential of HPLCOM'
  ; Item #4 'external feedback'
  : values=0
numid=7,iface=MIXER,name='Right Line Mixer DACL1 Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=72,iface=MIXER,name='Right Line Mixer DACL1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=75,iface=MIXER,name='Right Line Mixer DACR1 Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=70,iface=MIXER,name='Right Line Mixer Line2L Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=5,iface=MIXER,name='Right Line Mixer Line2L Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=73,iface=MIXER,name='Right Line Mixer Line2R Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=71,iface=MIXER,name='Right Line Mixer PGAL Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=6,iface=MIXER,name='Right Line Mixer PGAL Bypass Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=118,step=0
  : values=118
  | dBscale-min=-59.00dB,step=0.50dB,mute=1
numid=74,iface=MIXER,name='Right Line Mixer PGAR Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=84,iface=MIXER,name='Right Line1L Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'single-ended'
  ; Item #1 'differential'
  : values=0
numid=83,iface=MIXER,name='Right Line1R Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'single-ended'
  ; Item #1 'differential'
  : values=0
numid=82,iface=MIXER,name='Right Line2R Mux'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'single-ended'
  ; Item #1 'differential'
  : values=0
numid=86,iface=MIXER,name='Right PGA Mixer Line1L Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=85,iface=MIXER,name='Right PGA Mixer Line1R Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=87,iface=MIXER,name='Right PGA Mixer Line2R Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=88,iface=MIXER,name='Right PGA Mixer Mic3L Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=89,iface=MIXER,name='Right PGA Mixer Mic3R Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off

3.查看獲取某個設置項的值用amixer cget  +控制參數

這裏控制參數直接複製amixer controls打印出來的數據就行

類似numid=94,iface=MIXER,name='Left PGA Mixer Line1R Switch'

root@dvr:/# amixer cget numid=94,iface=MIXER,name='Left PGA Mixer Line1R Switch'
numid=94,iface=MIXER,name='Left PGA Mixer Line1R Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off

4.根據控制參數類型設置控制參數使用amixer cset +控制參數+" "+參數

記住要用空格隔開控制參數和參數

root@dvr:/# amixer cset numid=94,iface=MIXER,name='Left PGA Mixer Line1R Switch' on
numid=94,iface=MIXER,name='Left PGA Mixer Line1R Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on

5.參數

values表示數值對於volume之類的是具體的數字,在上下文菜單中有顯示數值的範圍,

對於swith之類的表示開關一般是on或off

 

 二、aplay和arecord用於播放和記錄

arecord幫助提示信息

Usage: arecord [OPTION]... [FILE]...

-h, --help              help
    --version           print current version
-l, --list-devices      list all soundcards and digital audio devices
-L, --list-pcms         list device names
-D, --device=NAME       select PCM by name
-q, --quiet             quiet mode
-t, --file-type TYPE    file type (voc, wav, raw or au)
-c, --channels=#        channels
-f, --format=FORMAT     sample format (case insensitive)
-r, --rate=#            sample rate
-d, --duration=#        interrupt after # seconds
-M, --mmap              mmap stream
-N, --nonblock          nonblocking mode
-F, --period-time=#     distance between interrupts is # microseconds
-B, --buffer-time=#     buffer duration is # microseconds
    --period-size=#     distance between interrupts is # frames
    --buffer-size=#     buffer duration is # frames
-A, --avail-min=#       min available space for wakeup is # microseconds
-R, --start-delay=#     delay for automatic PCM start is # microseconds 
                        (relative to buffer size if <= 0)
-T, --stop-delay=#      delay for automatic PCM stop is # microseconds from xrun
-v, --verbose           show PCM structure and setup (accumulative)
-V, --vumeter=TYPE      enable VU meter (TYPE: mono or stereo)
-I, --separate-channels one file for each channel
    --disable-resample  disable automatic rate resample
    --disable-channels  disable automatic channel conversions
    --disable-format    disable automatic format conversions
    --disable-softvol   disable software volume control (softvol)
    --test-position     test ring buffer position
    --test-coef=#        test coeficient for ring buffer position (default 8)
                        expression for validation is: coef * (buffer_size / 2)
    --test-nowait       do not wait for ring buffer - eats whole CPU
    --max-file-time=#   start another output file when the old file has recorded
                        for this many seconds
    --process-id-file   write the process ID here
    --use-strftime      apply the strftime facility to the output file name
Recognized sample formats are: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE IEC958_SUBFRAME_LE IEC958_SUBFRAME_BE MU_LAW A_LAW IMA_ADPCM MPEG GSM SPECIAL S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE S18_3BE U18_3LE
Some of these may not be available on selected hardware
The availabled format shortcuts are:
-f cd (16 bit little endian, 44100, stereo)
-f cdr (16 bit big endian, 44100, stereo)
-f dat (16 bit little endian, 48000, stereo)

arecord -l列出聲卡和數字音頻設備

card 0: SOUND0 [TI81XX SOUND0], device 0: TVP-PCM tvp5158-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: SOUND0 [TI81XX SOUND0], device 1: AIC3X tlv320aic3x-hifi-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

-D參數用於指定音頻設備PCM

以hwx,x開頭

根據上面l列出的設備,如果選擇tvp5158來錄製聲音的話那麼pcm設備就位hw0,0,如果是tlv320aic3x則pcm設備爲hw0,1。

聲卡號,設備號

-r指定採樣頻率:5512/8000/11025/16000/22050/32000/44100/48000/64000/88200/96000/176400/192000

-f指定採樣格式上面列出了:cd/cdr/dat

 

錄製音頻的完整命令例子

arecord -Dhw:0,1 -r8000 -f cd /a/1.wmv

之後在/a目錄下可以找到1.wmv文件

 

aplay幫助提示信息

Usage: aplay [OPTION]... [FILE]...

-h, --help              help
    --version           print current version
-l, --list-devices      list all soundcards and digital audio devices
-L, --list-pcms         list device names
-D, --device=NAME       select PCM by name
-q, --quiet             quiet mode
-t, --file-type TYPE    file type (voc, wav, raw or au)
-c, --channels=#        channels
-f, --format=FORMAT     sample format (case insensitive)
-r, --rate=#            sample rate
-d, --duration=#        interrupt after # seconds
-M, --mmap              mmap stream
-N, --nonblock          nonblocking mode
-F, --period-time=#     distance between interrupts is # microseconds
-B, --buffer-time=#     buffer duration is # microseconds
    --period-size=#     distance between interrupts is # frames
    --buffer-size=#     buffer duration is # frames
-A, --avail-min=#       min available space for wakeup is # microseconds
-R, --start-delay=#     delay for automatic PCM start is # microseconds 
                        (relative to buffer size if <= 0)
-T, --stop-delay=#      delay for automatic PCM stop is # microseconds from xrun
-v, --verbose           show PCM structure and setup (accumulative)
-V, --vumeter=TYPE      enable VU meter (TYPE: mono or stereo)
-I, --separate-channels one file for each channel
    --disable-resample  disable automatic rate resample
    --disable-channels  disable automatic channel conversions
    --disable-format    disable automatic format conversions
    --disable-softvol   disable software volume control (softvol)
    --test-position     test ring buffer position
    --test-coef=#        test coeficient for ring buffer position (default 8)
                        expression for validation is: coef * (buffer_size / 2)
    --test-nowait       do not wait for ring buffer - eats whole CPU
    --max-file-time=#   start another output file when the old file has recorded
                        for this many seconds
    --process-id-file   write the process ID here
    --use-strftime      apply the strftime facility to the output file name
Recognized sample formats are: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE IEC958_SUBFRAME_LE IEC958_SUBFRAME_BE MU_LAW A_LAW IMA_ADPCM MPEG GSM SPECIAL S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE S18_3BE U18_3LE
Some of these may not be available on selected hardware
The availabled format shortcuts are:
-f cd (16 bit little endian, 44100, stereo)
-f cdr (16 bit big endian, 44100, stereo)
-f dat (16 bit little endian, 48000, stereo)

aplay -l 列出聲卡和數字音頻設備

card 0: SOUND0 [TI81XX SOUND0], device 1: AIC3X tlv320aic3x-hifi-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: SOUND1 [TI81XX SOUND1], device 0: hdmi HDMI-DAI-CODEC-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

-D參數用於指定音頻設備PCM

以hwx,x開頭

根據上面l列出的設備,如果選擇tlv320aic3x來播放聲音的話那麼pcm設備就位hw0,1,如果是hdmi則pcm設備爲hw0,0。

聲卡號,設備號

-r指定採樣頻率:5512/8000/11025/16000/22050/32000/44100/48000/64000/88200/96000/176400/192000

-f指定採樣格式上面列出了:cd/cdr/dat

 

完整的播放例子：

aplay -Dhw:0,1 -r8000 -f cd /a/1.wmv

上面的例子必須先錄製在播放,如果想要一邊播放一邊收聽可以用下面利用管道的命令

arecord -Dhw:0,1 -r192000 -f cd|aplay -Dhw:0,1 -r192000

 三.交叉編譯

1.官網http://www.alsa-project.org下載alsa-lib和alsa-utils

我的版本:alsa-lib-1.0.27.2.tar.bz2 和alsa-utils-1.0.27.2.tar.bz2

2.創建/home/m/3rd/alsa目錄,並在目錄下創建install目錄,接着把壓縮包拷到alsa目錄下

3.編譯alsa-lib步驟

tar -xvf alsa-lib-1.0.27.2.tar.bz2 
cd alsa-lib-1.0.27.2
CC=arm-none-linux-gnueabi-gcc ./configure --host=arm-linux  --prefix=/home/m/3rd/alsa/install/
make
make install

4.編譯alsa-utils步驟

tar -xvf alsa-utils-1.0.27.2.tar.bz2
cd alsa-utils-1.0.27.2
CC=arm-none-linux-gnueabi-gcc ./configure --prefix=/home/m/3rd/alsa/install/ --host=arm-linux --with-alsa-inc-prefix=/home/m/3rd/alsa/install/include --with-alsa-prefix=/home/m/3rd/alsa/install/lib --disable-alsamixer --disable-xmlto --disable-nls
make

5.簡單說明

--prefix指定了alsa-lib編譯後的安裝目錄,包含庫和頭文件,編譯alsa-utils時候要指明它的庫lib和頭文件include的目錄.

alsamixer是圖形化的amixer工具,需要ncurses的支持,在secure CRT中亂碼,怕麻煩用--disable-alsamixer禁用了它.

--disable-xmlto和--disable-nls去掉編譯都不通過,沒去研究爲啥.

aplay和arecord是同一個東東改下名字就可以了

真相在此

	if (strstr(argv[0], "arecord")) {
		stream = SND_PCM_STREAM_CAPTURE;
		file_type = FORMAT_WAVE;
		command = "arecord";
		start_delay = 1;
		direction = stdout;
	} else if (strstr(argv[0], "aplay")) {
		stream = SND_PCM_STREAM_PLAYBACK;
		command = "aplay";
		direction = stdin;
	} else {
		error(_("command should be named either arecord or aplay"));
		return 1;
	}