linux arecord 命令,如何使用arecord录音
如何使用arecord錄音
arecord 是ALSA聲卡驅動程序的命令行聲音文件記錄器。 它支持多種文件格式和具有多個設備的多個聲卡。 如果以交錯模式錄制,文件將在2GB文件大小之前自動分割。
使用前先查看 arecord 的幫助信息:
[root@imx6ull:~]# arecord -h
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
-s, --samples=# interrupt after # samples per channel
-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
-i, --interactive allow interactive operation from stdin
-m, --chmap=ch1,ch2,.. Give the channel map to override or follow
--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 coefficient 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
--dump-hw-params dump hw_params of the device
--fatal-errors treat all errors as fatal
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 U18_3BE G723_24 G723_24_1B G723_40 G723_40_1B DSD_U8 DSD_U16_LE DSD_U32_LE DSD_U16_BE DSD_U32_BE
Some of these may not be available on selected hardware
The available 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)
根據幫助信息可知:
使用 arecord -l 命令列出聲卡和數字音頻設備:
[root@imx6ull:~]# arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: wm8960audio [wm8960-audio], device 0: HiFi wm8960-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: wm8960audio [wm8960-audio], device 1: HiFi-ASRC-FE (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
得到聲卡和數字音頻設備列表后,可根據其信息進行以下操作:
-d 指定錄音時間(秒)
-D 參數用于指定音頻設備 PCM
以 hwx,x 開頭(聲卡號,設備號)
根據上面列出的設備,如果選擇 HiFi wm8960-hifi-0 來錄制聲音的話那么 pcm 設備就為 hw0,0,如果是 HiFi wm8960-hifi-1 則 pcm 設備為 hw0,1,HiFi wm8960-hifi-2 則 pcm 設備為 hw0,2 ...以此類推。
-r 指定采樣頻率: 5512/8000/11025/16000/22050/32000/44100/48000/64000/88200/96000/176400/192000
-f 指定采樣格式上面的幫助信息列出了: cd/cdr/dat/S16_LE/S32_LE/...
示例:
[root@imx6ull:~]# arecord -D default:CARD=mcasp0 -d 100000 -f cd -t raw duration—100000s_format-cd.raw
[root@imx6ull:~]# arecord -D default:CARD=mcasp0 -d 100000 -f dat -t raw duration—100000s_format-dat.raw
[root@imx6ull:~]# arecord -D default:CARD=mcasp0 -d 100000 -f S16_LE -r 16000 -t raw duration—100000s_format-S16_LE_rate-16000.raw
[root@imx6ull:~]# arecord -Dhw:0,1 -r8000 -f cd test.wmv
[root@imx6ull:~]# arecord -Dhw:0,0 -r8000 -f S16_LE -c 2 test.wmv
[root@imx6ull:~]# arecord -Dhw:0,2 -r48000 -f S32_LE -c 2 test.wmv
總結
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