You can read it. Embedded linux/android alsa_aplay alsa_amixer command line use method

A few days ago in the embedded Linux used to Alsa command, on-line check the data do not give the force, only a little hands to check, and finally can use, will this use to tell everyone, lest everyone less detours.

0. First check which ALSA cmd the system supports:

ll/system/bin/asla*

After checking, my android4.4.2+linux3.10 system supports such as the following ALSA cmd

-rwxr-xr-x root Shell 68242 2014-10-08 05:18 alsa_amixer
-rwxr-xr-x root Shell 67639 2014-10-08 05:18 Alsa_aplay
-rwxr-xr-x root Shell 130323 2014-10-08 05:18 Alsa_ctl

Different systems can be slightly different, for example some systems are called aplay\amixer .....

1. How to use Alsa_aplay:

Alsa_aplay-h//Look at what use methods are supported at the moment

-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 was # 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

There will be specific help instructions, this will not say, can try.
Alsa_aplay-l//List the system has several sound cards (card 0/1/2 ...), and one device per card (Devices 0/1/2 ...)

For example, my system is:

List of PLAYBACK Hardware Devices * * * * *
Card 0:loopback [Loopback], device 0:loopback PCM [Loopback PCM]
Subdevices:8/8
Subdevice #0: Subdevice #0
Subdevice #1: Subdevice #1
Subdevice #2: Subdevice #2
Subdevice #3: Subdevice #3
Subdevice #4: Subdevice #4
Subdevice #5: Subdevice #5
Subdevice #6: Subdevice #6
Subdevice #7: Subdevice #7
Card 0:loopback [Loopback], device 1:loopback PCM [Loopback PCM]
Subdevices:8/8
Subdevice #0: Subdevice #0
Subdevice #1: Subdevice #1
Subdevice #2: Subdevice #2
Subdevice #3: Subdevice #3
Subdevice #4: Subdevice #4
Subdevice #5: Subdevice #5
Subdevice #6: Subdevice #6
Subdevice #7: Subdevice #7
Card 1:INTELALSASSP [INTELALSASSP], device 0:bt_device [INTELALSASSP]
Subdevices:1/1
Subdevice #0: Subdevice #0
Card 1:INTELALSASSP [INTELALSASSP], device 2:builtin_device [INTELALSASSP]
Subdevices:1/1
Subdevice #0: Subdevice #0
Card 2:cloverviewaudio [Cloverview_audio], device 0:4 []
Subdevices:2/2
Subdevice #0: Subdevice #0
Subdevice #1: Subdevice #1
Card 2:cloverviewaudio [Cloverview_audio], device 1:voice rt5640-aif2-1 []
Subdevices:1/1
Subdevice #0: Subdevice #0
Card 2:cloverviewaudio [Cloverview_audio], device 3:btsco snd-soc-dummy-dai-3 []
Subdevices:1/1
Subdevice #0: Subdevice #0
Card 2:cloverviewaudio [Cloverview_audio], device 4:voip rt5640-aif2-4 []
Subdevices:1/1
Subdevice #0: Subdevice #0
Card 2:cloverviewaudio [Cloverview_audio], device 5:ifx_modem_mixing snd-soc-dummy-dai-5 []
Subdevices:1/1
Subdevice #0: Subdevice #0
Card 2:cloverviewaudio [Cloverview_audio], device 6:virtual-stream rt5640-aif1-6 []
Subdevices:1/1
Subdevice #0: Subdevice #0
Card 2:cloverviewaudio [Cloverview_audio], device 7:CTP Probe snd-soc-dummy-dai-7 []
Subdevices:1/1
Subdevice #0: Subdevice #0

Because my codec is alc5640, so
Learned from the above alc5640 hanging on the card2, so we will be configured Amixer 5640 when the-C 2 is right.

2. How to use Alsa_amixer

Alsa_amixer-h//The same help, not listed here.

How to use alc5640 for mixer control:

# alsa_amixer-c 2 Controls

For example, the following:

Alsa_amixer-c 2 Controls
Numid=35,iface=mixer,name= ' Headphone Switch '
Numid=20,iface=mixer,name= ' Mono ADC Capture Volume '
Numid=122,iface=mixer,name= ' Mono ADC L1 Mux '
Numid=123,iface=mixer,name= ' Mono ADC L2 Mux '
Numid=114,iface=mixer,name= ' Mono ADC mixl ADC1 Switch '
Numid=115,iface=mixer,name= ' Mono ADC mixl ADC2 Switch '
Numid=112,iface=mixer,name= ' Mono ADC mixr ADC1 Switch '
Numid=113,iface=mixer,name= ' Mono ADC mixr ADC2 Switch '
Numid=121,iface=mixer,name= ' Mono ADC R1 Mux '
Numid=120,iface=mixer,name= ' Mono ADC R2 Mux '
Numid=93,iface=mixer,name= ' Mono DAC MIXL DAC L1 Switch '
Numid=94,iface=mixer,name= ' Mono DAC MIXL DAC L2 Switch '
Numid=95,iface=mixer,name= ' Mono DAC MIXL DAC R2 Switch '
Numid=92,iface=mixer,name= ' Mono DAC mixr DAC L2 Switch '
Numid=90,iface=mixer,name= ' Mono DAC mixr DAC R1 Switch '
Numid=91,iface=mixer,name= ' Mono DAC mixr DAC R2 Switch '
Numid=11,iface=mixer,name= ' Mono DAC Playback Volume '
Numid=44,iface=mixer,name= ' Mono MIX BST1 Switch '
Numid=41,iface=mixer,name= ' Mono MIX DAC L2 Switch '
Numid=40,iface=mixer,name= ' Mono MIX DAC R2 Switch '
Numid=43,iface=mixer,name= ' Mono MIX outvol L Switch '
Numid=42,iface=mixer,name= ' Mono MIX outvol R Switch '
Numid=85,iface=mixer,name= ' Mono dacr Mux '
Numid=8,iface=mixer,name= ' Mono Playback Switch '
Numid=21,iface=mixer,name= ' ADC Boost Gain '
Numid=24,iface=mixer,name= ' ADC IF1 Data Switch '
Numid=26,iface=mixer,name= ' ADC IF2 Data Switch '
Numid=18,iface=mixer,name= ' ADC Capture Switch '
Numid=19,iface=mixer,name= ' ADC Capture Volume '
Numid=22,iface=mixer,name= ' Class D SPK Ratio Control '
Numid=25,iface=mixer,name= ' DAC IF1 Data Switch '
Numid=27,iface=mixer,name= ' DAC IF2 Data Switch '
Numid=103,iface=mixer,name= ' DAC L2 Mux '
Numid=107,iface=mixer,name= ' DAC mixl INF1 Switch '
Numid=106,iface=mixer,name= ' DAC mixl Stereo ADC Switch '
Numid=105,iface=mixer,name= ' DAC mixr INF1 Switch '
Numid=104,iface=mixer,name= ' DAC mixr Stereo ADC Switch '
Numid=102,iface=mixer,name= ' DAC R2 Mux '
Numid=10,iface=mixer,name= ' DAC1 Playback Volume '
Numid=9,iface=mixer,name= ' DAC2 Playback Switch '
Numid=108,iface=mixer,name= ' DAI select '
Numid=88,iface=mixer,name= ' DIG mixl DAC L1 Switch '
Numid=89,iface=mixer,name= ' DIG mixl DAC L2 Switch '
Numid=86,iface=mixer,name= ' DIG mixr DAC R1 Switch '
Numid=87,iface=mixer,name= ' DIG mixr DAC R2 Switch '
Numid=23,iface=mixer,name= ' DMIC Switch '
Numid=37,iface=mixer,name= ' Ext Spk L Switch '
Numid=38,iface=mixer,name= ' Ext Spk R Switch '
Numid=3,iface=mixer,name= ' HP Playback Switch '
Numid=4,iface=mixer,name= ' HP Playback Volume '
Numid=50,iface=mixer,name= ' HPO MIX DAC1 Switch '
Numid=49,iface=mixer,name= ' HPO MIX DAC2 Switch '
Numid=51,iface=mixer,name= ' HPO MIX hpvol Switch '
Numid=36,iface=mixer,name= ' Headset Mic Switch '
Numid=111,iface=mixer,name= ' IF2 ADC L Mux '
Numid=110,iface=mixer,name= ' IF2 ADC R Mux '
Numid=17,iface=mixer,name= ' in Capture Volume '
Numid=13,iface=mixer,name= ' IN1 Boost '
Numid=12,iface=mixer,name= ' IN1 Mode Control '
Numid=15,iface=mixer,name= ' IN2 Boost '
Numid=14,iface=mixer,name= ' IN2 Mode Control '
Numid=39,iface=mixer,name= ' Int Mic Switch '
Numid=45,iface=mixer,name= ' LOUT MIX DAC L1 Switch '
Numid=46,iface=mixer,name= ' LOUT MIX DAC R1 Switch '
Numid=47,iface=mixer,name= ' LOUT MIX outvol L Switch '
Numid=48,iface=mixer,name= ' LOUT MIX outvol R Switch '
Numid=29,iface=mixer,name= ' LPE IHF MIXER '
Numid=30,iface=mixer,name= ' LPE headset MIXER '
Numid=6,iface=mixer,name= ' Out Channel Switch '
Numid=69,iface=mixer,name= ' out MIXL BST1 Switch '
Numid=68,iface=mixer,name= ' out MIXL BST3 Switch '
Numid=74,iface=mixer,name= ' out MIXL DAC L1 Switch '
Numid=73,iface=mixer,name= ' out MIXL DAC L2 Switch '
Numid=72,iface=mixer,name= ' out MIXL DAC R2 Switch '
Numid=70,iface=mixer,name= ' out MIXL INL Switch '
Numid=71,iface=mixer,name= ' out MIXL REC mixl Switch '
Numid=62,iface=mixer,name= ' out mixr BST1 Switch '
Numid=61,iface=mixer,name= ' out mixr BST2 Switch '
Numid=60,iface=mixer,name= ' out mixr BST3 Switch '
Numid=65,iface=mixer,name= ' out mixr DAC L2 Switch '
Numid=67,iface=mixer,name= ' out mixr DAC R1 Switch '
Numid=66,iface=mixer,name= ' out mixr DAC R2 Switch '
Numid=63,iface=mixer,name= ' out mixr INR Switch '
Numid=64,iface=mixer,name= ' out mixr REC mixr Switch '
Numid=5,iface=mixer,name= ' Out Playback Switch '
Numid=7,iface=mixer,name= ' Out Playback Volume '
Numid=138,iface=mixer,name= ' RECMIXL BST1 Switch '
Numid=137,iface=mixer,name= ' RECMIXL BST2 Switch '
Numid=136,iface=mixer,name= ' RECMIXL BST3 Switch '
Numid=134,iface=mixer,name= ' RECMIXL Hpol Switch '
Numid=135,iface=mixer,name= ' RECMIXL INL Switch '
Numid=139,iface=mixer,name= ' RECMIXL out MIXL Switch '
Numid=132,iface=mixer,name= ' Recmixr BST1 Switch '
Numid=131,iface=mixer,name= ' Recmixr BST2 Switch '
Numid=130,iface=mixer,name= ' Recmixr BST3 Switch '
Numid=128,iface=mixer,name= ' Recmixr hpor Switch '
Numid=129,iface=mixer,name= ' Recmixr INR Switch '
Numid=133,iface=mixer,name= ' recmixr out MIXR Switch '
Numid=28,iface=mixer,name= ' Register Control '
Numid=109,iface=mixer,name= ' SDI select '
Numid=82,iface=mixer,name= ' SPK mixl DAC L1 Switch '
Numid=83,iface=mixer,name= ' SPK mixl DAC L2 Switch '
Numid=81,iface=mixer,name= ' SPK mixl INL Switch '
Numid=84,iface=mixer,name= ' SPK mixl out MIXL Switch '
Numid=80,iface=mixer,name= ' SPK mixl REC mixl Switch '
Numid=77,iface=mixer,name= ' SPK mixr DAC R1 Switch '
Numid=78,iface=mixer,name= ' SPK mixr DAC R2 Switch '
Numid=76,iface=mixer,name= ' SPK mixr INR Switch '
Numid=79,iface=mixer,name= ' SPK mixr out MIXR Switch '
Numid=75,iface=mixer,name= ' SPK mixr REC mixr Switch '
Numid=59,iface=mixer,name= ' Spol MIX BST1 Switch '
Numid=56,iface=mixer,name= ' Spol MIX DAC L1 Switch '
Numid=55,iface=mixer,name= ' Spol MIX DAC R1 Switch '
Numid=58,iface=mixer,name= ' Spol MIX spkvol L Switch '
Numid=57,iface=mixer,name= ' Spol MIX spkvol R Switch '
Numid=54,iface=mixer,name= ' Spor MIX BST1 Switch '
Numid=52,iface=mixer,name= ' Spor MIX DAC R1 Switch '
Numid=53,iface=mixer,name= ' Spor MIX spkvol R Switch '
Numid=32,iface=mixer,name= ' SSP BT Master Mode '
Numid=34,iface=mixer,name= ' SSP Modem Master Mode '
Numid=33,iface=mixer,name= ' SSP VOIP Master Mode '
Numid=31,iface=mixer,name= ' SST Probe Byte Control '
Numid=16,iface=mixer,name= ' Speaker Boost '
Numid=1,iface=mixer,name= ' Speaker Playback Switch '
Numid=2,iface=mixer,name= ' Speaker Playback Volume '
Numid=125,iface=mixer,name= ' Stereo ADC L1 Mux '
Numid=127,iface=mixer,name= ' Stereo ADC L2 Mux '
Numid=118,iface=mixer,name= ' Stereo ADC mixl ADC1 Switch '
Numid=119,iface=mixer,name= ' Stereo ADC mixl ADC2 Switch '
Numid=116,iface=mixer,name= ' Stereo ADC mixr ADC1 Switch '
Numid=117,iface=mixer,name= ' Stereo ADC mixr ADC2 Switch '
Numid=124,iface=mixer,name= ' Stereo ADC R1 Mux '
Numid=126,iface=mixer,name= ' Stereo ADC R2 Mux '
Numid=101,iface=mixer,name= ' Stereo DAC mixl ANC Switch '
Numid=99,iface=mixer,name= ' Stereo DAC MIXL DAC L1 Switch '
Numid=100,iface=mixer,name= ' Stereo DAC MIXL DAC L2 Switch '
Numid=98,iface=mixer,name= ' Stereo DAC mixr ANC Switch '
Numid=96,iface=mixer,name= ' Stereo DAC mixr DAC R1 Switch '
Numid=97,iface=mixer,name= ' Stereo DAC mixr DAC R2 Switch '

Alsa_amixer-c 2 cget numid=2//Get the main speaker's volume from Card2

Alsa_amixer-c 2 Cset numid=2 39//Set the volume of the main speaker from the Card2 =39
Alsa_amixer-c 2 Cset numid=2 100%//Set the volume of the main speaker from the Card2 =39

You can read it. Embedded linux/android alsa_aplay alsa_amixer command line use method