MTK平台通过adb命令打开audio hal, framework的debug log_audio_hw的log怎么查看

操作步骤

1. 找到需要开启log的代码文件
2. 在代码中的找到InitializeMTKLogLevel(“属性”);
3. adb shell setprop “属性” 3/2/1 来打开对应log level的log

eg:  setprop vendor.af.tracks.log 3
//this will enable all MTK_ALOGV in tracks.cpp even in user load
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MTK log 详细介绍

详细见 frameworks/av/include/media/Mtklogger.h

/***
 * Include this file can use MTK log function.
 *
 * Put the InitializeMTKLogLevel() to the constructor(or any initialize function) of your file.
 * You can use "setprop property log_level" to define the log level.
 * ex:
 *    "setprop vendor.af.tracks.log 3"  // this will enable all MTK_ALOGV in tracks.cpp even in user load
 *
 * After kill AudioServer(or call InitializeMTKLogLevel() again) the log level will work. 重启才能生效
 *
 * _log_level: 0 - Disable
 *             1 - user load only
 *             2 - user + userdebug
 *             3 - eng (always print)
 *
 * If your log_level >= _log_level the log will print.
 *
 *
 * You can use specified number for special purpose.
 * ex:
 *   MTK_ALOGS(4, "Only enable this log if property >=4");
 *
 ***/
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andorid 原生的ALOGV 使能打印方法

例子：对于AudioPolicyManager.cpp 代码
找到 #define LOG_TAG “APM_AudioPolicyManager”
然后 adb shell setprop log.tag.APM_AudioPolicyManager V 即可使能ALOGV及其以上的log level打印