2019-01-18 17:46:31 +08:00
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# Arecord_使用帮助
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使用示例如下：
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arecord -D default:CARD=mcasp0 -d 100000 -f cd -t raw mysong15.raw
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arecord -D default:CARD=mcasp0 -d 100000 -f dat -t raw mysong10.raw
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arecord -D default:CARD=mcasp0 -d 100000 -f S16_LE -r 16000 -t raw mysong10.raw
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arecord -Dhw:0,1 -r8000 -f cd /a/1.wmv
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arecord -Dhw:0,0 -r8000 -f S16_LE -c 1 -t wav 1.wav
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arecord -Dhw:0,2 -r48000 -f S32_LE -c 2 -t wav 2.wav
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帮助说明如下：
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```sh
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arecord -h
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Usage: arecord [OPTION]... [FILE]...
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-h, --help help
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--version print current version
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-l, --list-devices list all soundcards and digital audio devices
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-L, --list-pcms list device names
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-D, --device=NAME select PCM by name
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-q, --quiet quiet mode
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-t, --file-type TYPE file type (voc, wav, raw or au)
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-c, --channels=# channels
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-f, --format=FORMAT sample format (case insensitive)
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-r, --rate=# sample rate
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-d, --duration=# interrupt after # seconds
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-M, --mmap mmap stream
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-N, --nonblock nonblocking mode
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-F, --period-time=# distance between interrupts is # microseconds
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-B, --buffer-time=# buffer duration is # microseconds
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--period-size=# distance between interrupts is # frames
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--buffer-size=# buffer duration is # frames
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-A, --avail-min=# min available space for wakeup is # microseconds
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-R, --start-delay=# delay for automatic PCM start is # microseconds
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(relative to buffer size if <= 0)
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-T, --stop-delay=# delay for automatic PCM stop is # microseconds from xrun
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-v, --verbose show PCM structure and setup (accumulative)
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-V, --vumeter=TYPE enable VU meter (TYPE: mono or stereo)
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-I, --separate-channels one file for each channel
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-i, --interactive allow interactive operation from stdin
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-m, --chmap=ch1,ch2,.. Give the channel map to override or follow
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--disable-resample disable automatic rate resample
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--disable-channels disable automatic channel conversions
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--disable-format disable automatic format conversions
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--disable-softvol disable software volume control (softvol)
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--test-position test ring buffer position
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--test-coef=# test coefficient for ring buffer position (default 8)
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expression for validation is: coef * (buffer_size / 2)
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--test-nowait do not wait for ring buffer - eats whole CPU
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--max-file-time=# start another output file when the old file has recorded
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for this many seconds
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--process-id-file write the process ID here
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--use-strftime apply the strftime facility to the output file name
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--dump-hw-params dump hw_params of the device
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--fatal-errors treat all errors as fatal
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2019-01-18 18:17:47 +08:00
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支持的采样格式是︰ 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
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有部分可能选取的硬件不提供
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2019-01-18 17:46:31 +08:00
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The available format shortcuts are:
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-f cd (16 bit little endian, 44100, stereo)
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-f cdr (16 bit big endian, 44100, stereo)
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-f dat (16 bit little endian, 48000, stereo)
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```
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