tinyplay 聲卡播放

https://blog.csdn.net/wenjin359/article/details/83006820

/dev/snd/pcmC*

vendor/brand/kernel/linaro/sound/core/init.c
    snd_card_create
vendor/brand/kernel/linaro/sound/usb/card.c
    snd_usb_audio_probe

root@:/ # cat proc/asound/cards                                            
 0 [No00           ]: brand ALSA Drv - brand MAD No.00
                      brand MPEG Audio Decoder No.00

root@:/ # tinypcminfo -D /proc/asound/cards
    Info for card 0, device 0:
    PCM out:

root@:/ # tinyplay mnt/usb/17EC-1152/file.wav -D 0 -d 2 -n 2
//tinyplay mnt/usb/17EC-1152/file.wav -D 0 -d 3 -n 2                          

root@:/ # ls -al dev/snd/pcm*                                            
crw-rw---- system   audio    116,  24 2007-01-01 20:00 pcmC0D0c
crw-rw---- system   audio    116,  16 2007-01-01 20:00 pcmC0D0p
crw-rw---- system   audio    116,  25 2007-01-01 20:00 pcmC0D1c
crw-rw---- system   audio    116,  17 2007-01-01 20:00 pcmC0D1p
crw-rw---- system   audio    116,  18 2007-01-01 20:00 pcmC0D2p
crw-rw---- system   audio    116,  19 2007-01-01 20:00 pcmC0D3p