查看声卡状态
//查看模拟声卡播放状态：
adb shell cat /proc/asound/card0/*/*/status
//查看VOIP声卡播放状态：
adb shell cat /proc/asound/card1/*/*/status
实例：
查看声卡顺序，每次开机注册顺序可能不一样，可以看到目前系统有三个声卡：
模拟声卡，打电话的声卡，voip声卡
1|sl8541e_1h10_32b:/ $ cat /proc/asound/cards
0 [sprdphone ]: sprdphone - sprdphone
sprdphone
1 [saudiolte ]: saudiolte - saudiolte
saudiolte
2 [saudiovoip ]: saudiovoip - saudiovoip
saudiovoip
待机：
sl8541e_1h10_32b:/ $ cat /proc/asound/card0/*/*/status
closed
closed
closed
closed
closed
closed
closed
closed
sl8541e_1h10_32b:/ $ cat /proc/asound/card1/*/*/status
closed
closed
closed
closed
讲话（录音）：
sl8541e_1h10_32b:/ $ cat /proc/asound/card0/*/*/status
closed
closed
state: RUNNING
owner_pid : 7264
trigger_time: 1666836399.469438708
tstamp : 0.000000000
delay : 0
avail : 0
avail_max : 0
-----
hw_ptr : 0
appl_ptr : 0
state: PREPARED
owner_pid : 7264
trigger_time: 1666836399.468863862
tstamp : 0.000000000
delay : 0
avail : 320
avail_max : 0
-----
hw_ptr : 0
appl_ptr : 0
closed
closed
closed
closed
sl8541e_1h10_32b:/ $ cat /proc/asound/card1/*/*/status
closed
closed
closed
closed
收听（播放）：
sl8541e_1h10_32b:/ $ cat /proc/asound/card0/*/*/status
closed
state: RUNNING
owner_pid : 949
trigger_time: 1179.798942809
tstamp : 1187.602456649
delay : 1200
avail : 720
avail_max : 1360
-----
hw_ptr : 344400
appl_ptr : 345600
closed
closed
closed
closed
closed
closed
sl8541e_1h10_32b:/ $ cat /proc/asound/card1/*/*/status
closed
closed
closed
closed
2022-11-03
昨晚修改后，VOIP通过LOG看已经打开，但是调试音频参数时发现通道似乎又切走了，再次分析日志。
下图是发起对讲：
image.png
发现VOIP打开后，又立即被关闭。
adb查看发起讲话时的声卡状态：
sl8541e_1h10_32b:/ # cat /proc/asound/cards
0 [sprdphone ]: sprdphone - sprdphone
sprdphone
1 [saudiolte ]: saudiolte - saudiolte
saudiolte
2 [saudiovoip ]: saudiovoip - saudiovoip
saudiovoip
sl8541e_1h10_32b:/ # cat /proc/asound/card1/*/*/status
closed
closed
closed
closed
sl8541e_1h10_32b:/ # cat /proc/asound/card0/*/*/status
state: RUNNING
owner_pid : 4994
trigger_time: 1176.116787850
tstamp : 1182.896760038
delay : 0
avail : 0
avail_max : 320
-----
hw_ptr : 54080
appl_ptr : 54080
closed
closed
closed
closed
closed
closed
closed
sl8541e_1h10_32b:/ # cat /proc/asound/card2/*/*/status
closed
closed
closed
sl8541e_1h10_32b:/ #
结论是对讲中，模拟声卡起作用，VOIP声卡关闭，问题还是在软件上。
原因分析：
发起对讲的过程是：按下PTT后，开始录音（打开VOIP），同时播放提示音（打开VOIP），提示音播放完（关闭VOIP）。导致后续的录音VOIP关闭状态。
