【平头哥Sipeed LicheeRV 86开发板试用】音频播放测试体验aplay...

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【平头哥Sipeed LicheeRV 86开发板试用】音频播放测试体验aplay alsamixer arecord命令


使用scp或sftp传音频文件到开发板，　
推荐此工具
MobaXterm
全带了还有ssh
详情参阅：【分享】MobaXterm 一款远程计算的终极工具箱 ...

注传到/tmp目录，　/root目录　快满了
如传/root目录，可以会出错误
df命令查看便知：

1. df
   
2. Filesystem           1K-blocks      Used Available Use% Mounted on
   
3. /dev/root                99884     82196     10520  89% /
   
4. devtmpfs                247644         8    247636   0% /dev
   
5. tmpfs                   251840     59576    192264  24% /tmp
   
6. /dev/mmcblk0p1            8151       677      7474   8% /mnt/SDCARD
   

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查看相关用法aplay

1. <div>aplay -h
   
2. Usage: aplay [OPTION]... [FILE]...
   
3. 
   
4. -h, --help              help
   
5.     --version           print current version
   
6. -l, --list-devices      list all soundcards and digital audio devices
   
7. -L, --list-pcms         list device names
   
8. -D, --device=NAME       select PCM by name
   
9. -q, --quiet             quiet mode
   
10. -t, --file-type TYPE    file type (voc, wav, raw or au)
    
11. -c, --channels=#        channels
    
12. -f, --format=FORMAT     sample format (case insensitive)
    
13. -r, --rate=#            sample rate
    
14. -d, --duration=#        interrupt after # seconds
    
15. -M, --mmap              mmap stream
    
16. -N, --nonblock          nonblocking mode
    
17. -F, --period-time=#     distance between interrupts is # microseconds
    
18. -B, --buffer-time=#     buffer duration is # microseconds
    
19.     --period-size=#     distance between interrupts is # frames
    
20.     --buffer-size=#     buffer duration is # frames
    
21. -A, --avail-min=#       min available space for wakeup is # microseconds
    
22. -R, --start-delay=#     delay for automatic PCM start is # microseconds
    
23.                         (relative to buffer size if <= 0)
    
24. -T, --stop-delay=#      delay for automatic PCM stop is # microseconds from xrun
    
25. -v, --verbose           show PCM structure and setup (accumulative)
    
26. -V, --vumeter=TYPE      enable VU meter (TYPE: mono or stereo)
    
27. -I, --separate-channels one file for each channel
    
28. -i, --interactive       allow interactive operation from stdin
    
29. -m, --chmap=ch1,ch2,..  Give the channel map to override or follow
    
30.     --disable-resample  disable automatic rate resample
    
31.     --disable-channels  disable automatic channel conversions
    
32.     --disable-format    disable automatic format conversions
    
33.     --disable-softvol   disable software volume control (softvol)
    
34.     --test-position     test ring buffer position
    
35.     --test-coef=#       test coefficient for ring buffer position (default 8)
    
36.                         expression for validation is: coef * (buffer_size / 2)
    
37.     --test-nowait       do not wait for ring buffer - eats whole CPU
    
38.     --max-file-time=#   start another output file when the old file has recorded
    
39.                         for this many seconds
    
40.     --process-id-file   write the process ID here
    
41.     --use-strftime      apply the strftime facility to the output file name
    
42.     --dump-hw-params    dump hw_params of the device
    
43.     --fatal-errors      treat all errors as fatal
    
44. 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
    
45. Some of these may not be available on selected hardware
    
46. The available format shortcuts are:
    
47. -f cd (16 bit little endian, 44100, stereo)
    
48. -f cdr (16 bit big endian, 44100, stereo)
    
49. -f dat (16 bit little endian, 48000, stereo)
    
50. </div>

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播放设备查看

1. root@MaixLinux:~# aplay -l
   
2. **** List of PLAYBACK Hardware Devices ****
   
3. card 0: audiocodec [audiocodec], device 0: SUNXI-CODEC 2030000.codec-0 []
   
4.   Subdevices: 1/1
   
5.   Subdevice 0: subdevice 0
   
6. card 2: sndhdmi [sndhdmi], device 0: 2034000.daudio-audiohdmi-dai 20340a4.hdmiaudio-0 []
   
7.   Subdevices: 1/1
   
8.   Subdevice 0: subdevice 0
   

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播放所有wav

1. aplay *wav
   
2. Playing WAVE 'CS2_AutoplayMusic.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Mono
   
3. Playing WAVE 'Call.wav' : Signed 16 bit Little Endian, Rate 11025 Hz, Stereo
   
4. Playing WAVE 'CallThePolice.wav' : Signed 16 bit Little Endian, Rate 11025 Hz, Stereo
   
5. Playing WAVE 'CheckOut.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Stereo
   
6. Playing WAVE 'Clear.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono
   
7. Warning: format is changed to U8
   
8. Playing WAVE 'Explosion.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
   
9. Playing WAVE 'music.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
   
10. Playing WAVE 'music_4mb.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
    
11. Playing WAVE 'music_long.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

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注：播放wav可以不加参数


播放raw文件

1. aplay -t raw -c 1 -f S16_LE -r 8000 *.raw

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注：
-t: type raw表示是PCM
-c: channel 1
-f S16_LE: Signed 16bit-width Little-Endian
-r: sample rate 8000

PCM是最raw的音频数据，没有任何头信息。WAV文件就是PCM+头信息，头信息就是上述的声道数，sample rate这些。所以WAV文件可以直接播放，而PCM需要手动指定这些信息之后才能播放。

*****注意：aplay是不能解码mp3, 所以播放不了mp3, 播出来是杂声

录放音测试：

查看arecord用法

1. arecord -h
   
2. Usage: arecord [OPTION]... [FILE]...
   
3. 
   
4. -h, --help              help
   
5.     --version           print current version
   
6. -l, --list-devices      list all soundcards and digital audio devices
   
7. -L, --list-pcms         list device names
   
8. -D, --device=NAME       select PCM by name
   
9. -q, --quiet             quiet mode
   
10. -t, --file-type TYPE    file type (voc, wav, raw or au)
    
11. -c, --channels=#        channels
    
12. -f, --format=FORMAT     sample format (case insensitive)
    
13. -r, --rate=#            sample rate
    
14. -d, --duration=#        interrupt after # seconds
    
15. -M, --mmap              mmap stream
    
16. -N, --nonblock          nonblocking mode
    
17. -F, --period-time=#     distance between interrupts is # microseconds
    
18. -B, --buffer-time=#     buffer duration is # microseconds
    
19.     --period-size=#     distance between interrupts is # frames
    
20.     --buffer-size=#     buffer duration is # frames
    
21. -A, --avail-min=#       min available space for wakeup is # microseconds
    
22. -R, --start-delay=#     delay for automatic PCM start is # microseconds
    
23.                         (relative to buffer size if <= 0)
    
24. -T, --stop-delay=#      delay for automatic PCM stop is # microseconds from xrun
    
25. -v, --verbose           show PCM structure and setup (accumulative)
    
26. -V, --vumeter=TYPE      enable VU meter (TYPE: mono or stereo)
    
27. -I, --separate-channels one file for each channel
    
28. -i, --interactive       allow interactive operation from stdin
    
29. -m, --chmap=ch1,ch2,..  Give the channel map to override or follow
    
30.     --disable-resample  disable automatic rate resample
    
31.     --disable-channels  disable automatic channel conversions
    
32.     --disable-format    disable automatic format conversions
    
33.     --disable-softvol   disable software volume control (softvol)
    
34.     --test-position     test ring buffer position
    
35.     --test-coef=#       test coefficient for ring buffer position (default 8)
    
36.                         expression for validation is: coef * (buffer_size / 2)
    
37.     --test-nowait       do not wait for ring buffer - eats whole CPU
    
38.     --max-file-time=#   start another output file when the old file has recorded
    
39.                         for this many seconds
    
40.     --process-id-file   write the process ID here
    
41.     --use-strftime      apply the strftime facility to the output file name
    
42.     --dump-hw-params    dump hw_params of the device
    
43.     --fatal-errors      treat all errors as fatal
    

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录音设备查看

1. root@MaixLinux:~# arecord -l
   
2. **** List of CAPTURE Hardware Devices ****
   
3. card 0: audiocodec [audiocodec], device 0: SUNXI-CODEC 2030000.codec-0 []
   
4.   Subdevices: 1/1
   
5.   Subdevice 0: subdevice 0
   
6. card 1: snddmic [snddmic], device 0: 2031000.dmic-dmic-hifi dmic-hifi-0 []
   
7.   Subdevices: 1/1
   
8.   Subdevice 0: subdevice 0
   
9. card 2: sndhdmi [sndhdmi], device 0: 2034000.daudio-audiohdmi-dai 20340a4.hdmiaudio-0 []
   
10.   Subdevices: 1/1
    
11.   Subdevice 0: subdevice 0

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录音命令

1.     arecord -D hw:1,0 -f S16_LE -t wav -d 10 test_record.wav
   

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注：
-D　hw:1,0 录音设备
-f S16_LE 16位数据格式
-t wav　保存为wav 格式
-d 10 录音时长10s
test_record.wav 保存录音文件名



播放录音：

1. aplay -D hw:0,0　test_record.wav
   

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用alsamixer 进行音量调整

输入alsamixer命令

1. alsamixer

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总结

本篇测试了Sipeed LicheeRV 86 Panel开发板使用aplay alsamixer arecord命令音频播放测试， 解码能力还是加强， 播放时CPU100%


音质还要加强， 我还换喇叭了