[RK3568 Android12] 音频及路由

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1：概述(耳机 ,hdmiin ,板载喇叭)

在开发板上面，系统注册了三个音频输出通道，如下：

[    2.280612] ALSA device list:
[    2.280622] #0: rockchip,rk809-codec
[    2.280630] #1: ROCKCHIP,SPDIF
[    2.280638] #2: rockchip,hdmi

console:/proc/asound # cat pcm                                                 
00-00: fe410000.i2s-rk817-hifi rk817-hifi-0 : fe410000.i2s-rk817-hifi rk817-hifi-0 : playback 1 : capture 1
01-00: fe460000.spdif-dit-hifi dit-hifi-0 : fe460000.spdif-dit-hifi dit-hifi-0 : playback 1
02-00: rockchip,hdmi i2s-hifi-0 : rockchip,hdmi i2s-hifi-0 : playback 1
console:/proc/asound # 
console:/proc/asound # 
console:/proc/asound # cat cards                                               
 0 [rockchiprk809co]: rockchip_rk809- - rockchip,rk809-codec
                      rockchip,rk809-codec