更新文件 Arecord_使用帮助.md

Software/Application/ALSA/Arecord_使用帮助.md

@@ -1 +1,64 @@
-# Arecord_使用帮助
+# Arecord_使用帮助
+
+使用示例如下：  
+
+    arecord -D default:CARD=mcasp0 -d 100000 -f cd -t raw mysong15.raw
+    arecord -D default:CARD=mcasp0 -d 100000 -f dat -t raw mysong10.raw
+    arecord -D default:CARD=mcasp0 -d 100000 -f S16_LE -r 16000 -t raw mysong10.raw
+    arecord -Dhw:0,1 -r8000 -f cd /a/1.wmv
+    arecord -Dhw:0,0 -r8000 -f S16_LE -c 1 -t wav 1.wav 
+    arecord -Dhw:0,2 -r48000 -f S32_LE -c 2 -t wav 2.wav
+
+帮助说明如下：
+
+```sh
+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
+-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
+認可的取樣格式是︰ 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
+有部份可能選取的硬體不提供
+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)
+```