Android adb shell dumpsys audio 信息查看分析详解_Powershell

android adb shell dumpsys audio 信息查看分析详解

一、前言

android 如果要分析当前设备的声音通道相关日志，
仅仅看audioservice的日志是看不到啥日志的，但是看整个audio关键字的日志又太多太乱了，
所以可以看一下系统提供的一个调试指令dumpsys audio 返回的信息进行定位分析，
里面主要包含了audioservice启动时间，当前设备的音频流指向，音频流的声音大小，音频外设的连接情况，音频播放记录，音频外设连接断开记录等等信息。

不同的android 系统使用 dumpsys audio 命令返回的日志信息可能会有差异，
因为打印返回的信息就是audioservice.java里面打印显示的，
本文的示例讲解是以mtk方案的android14日志信息进行讲解。
网上基本没有对dumpsys audio 日志信息进行分析的，有兴趣的可以收藏查看。

二、分析

1、简单示例和主要内容

本示例日志是设备连接蓝牙耳机后的dumpsys audio情况日志信息：

# dumpsys audio
[18:57:20]events log: audio services lifecycle
[18:57:20]11-22 18:54:07:681 audioservice() //(1)audioservice 启动时间，大概可以推测出开机时间
[18:57:20]mediafocuscontrol dump time: 6:57:22 pm //(2)执行dumpsys audio的时间
//(3)dumpsys audio最重要的内容，设备支持声音流情况
[18:57:20]stream volumes (device: index)
[18:57:20]- stream_voice_call (aliased to: stream_music):
。。。
[18:57:20]- stream_system (aliased to: stream_music):
。。。
[18:57:20]- stream_ring (aliased to: stream_music):
。。
//(4)基本是音频播放的情况，上面其他声音通道都是注释了以这个为标准
[18:57:20]- stream_music: 
[18:57:20]   muted: false
[18:57:20]   muted internally: false
[18:57:20]   min: 0  //声音范围
[18:57:20]   max: 15
[18:57:20]   streamvolume:7 //当前声音大小
[18:57:20]   current: 2 (speaker): 7, 80 (bt_a2dp): 7, 400 (hdmi): 7, 40000000 (default): 7
[18:57:20]   devices: bt_a2dp(80) //当前声音通道，蓝牙
[18:57:20]   volume group: music
[18:57:20]
[18:57:20]- stream_alarm (aliased to: stream_music):
[18:57:20]   muted: false
[18:57:20]   muted internally: false
[18:57:20]   min: 1
[18:57:20]   max: 7
[18:57:20]   streamvolume:4
[18:57:20]   current: 2 (speaker): 4, 80 (bt_a2dp): 4, 400 (hdmi): 4, 40000000 (default): 4
[18:57:20]   devices: speaker(2), bt_a2dp(80)
[18:57:20]   volume group: alarm
 //其他声音通道比较少实用，比如铃声，通知等情况
[18:57:20]- stream_notification (aliased to: stream_music):
[18:57:20]- stream_bluetooth_sco:
[18:57:20]- stream_system_enforced (aliased to: stream_music):
[18:57:20]- stream_dtmf (aliased to: stream_music):
[18:57:20]- stream_tts (aliased to: stream_music):
[18:57:20]- stream_accessibility (aliased to: stream_music):
[18:57:20]- stream_assistant (aliased to: stream_music):
。。。
//volume groups 不知道是干啥的，类型也是挺多的。
[18:57:20]volume groups (device: index)
[18:57:20]- volume group voice_call:
[18:57:20]   muted: false
[18:57:20]   min: 1
[18:57:20]   max: 7
[18:57:20]   current: 2 (speaker): 4, 80 (bt_a2dp): 7, 40000000 (default): 4
[18:57:20]   devices: bt_a2dp
[18:57:20]   streams: stream_voice_call 
[18:57:20]- volume group system:
[18:57:20]   muted: false
[18:57:20]   min: 0
[18:57:20]   max: 100
[18:57:20]   current: 2 (speaker): 47, 80 (bt_a2dp): 7, 40000000 (default): 47
[18:57:20]   devices: bt_a2dp
[18:57:20]   streams: stream_system 
[18:57:20]- volume group ring:
[18:57:20]- volume group music:
[18:57:20]- volume group alarm:
[18:57:20]- volume group alarm:
[18:57:20]- volume group bluetooth_sco:
[18:57:20]- volume group enforced_audible:
[18:57:20]- volume group dtmf:
[18:57:20]- volume group accessibility:
[18:57:20]- volume group assistant:
[18:57:20]- volume group audio_stream_rerouting:
[18:57:20]- volume group audio_stream_patch:
volume group类型的 streams属性值都是指向上面的stream volumes类型的。
[18:57:20]audio routes:
[18:57:20]  mmaintype=0x0
//(5)当前连接蓝牙的设备名称，如果未连接蓝牙为null
[18:57:20]  mbluetoothname=xiaodu portable speaker  
//(6)音频播放情况日志
[19:00:32]events log: playback activity as reported through playerbase
//开机铃声
[19:00:32]11-22 18:54:09:789 new player piid:71 uid/pid:1000/745 type:android.media.soundpool attr:audioattributes: usage=usage_assistance_sonification content=content_type_sonification flags=0x800 tags= bundle=null session:0
[19:00:33]11-22 18:54:10:837 new player piid:79 uid/pid:1000/1069 type:android.media.soundpool attr:audioattributes: usage=usage_media content=content_type_unknown flags=0x800 tags= bundle=null session:0
。。。
//音频文件播放+停止+播放+停止操作的日志
[19:00:33]11-22 18:58:37:956 player piid:103 event:started
[19:00:33]11-22 18:58:38:076 player piid:103 format update:formatinfo{isspatialized=false, channelmask=0x3, samplerate=44100}
[19:00:33]11-22 18:58:38:175 player piid:103 event:device updated deviceid:5
[19:00:33]11-22 18:58:38:190 player piid:103 event:device updated deviceid:5
[19:00:33]11-22 18:58:42:920 player piid:103 event:paused
[19:00:33]11-22 19:00:24:155 player piid:103 event:started
[19:00:33]11-22 19:00:24:169 player piid:103 format update:formatinfo{isspatialized=false, channelmask=0x3, samplerate=44100}
[19:00:33]11-22 19:00:24:204 player piid:103 event:device updated deviceid:5
[19:00:33]11-22 19:00:29:492 player piid:103 event:paused
//（7）当前连接的设备，这里是连接蓝牙耳机
[18:57:21]  connected devices:
[18:57:21]    [deviceinfo: type:0x80 (bt_a2dp) name:xiaodu portable speaker  addr:48:f3:f3:ed:78:ad codec: 1f000000 sensoruuid: 00000000-0000-0000-4254-48f3f3ed78ad disabled modes: {}]
[18:57:21]
//（8）如果是连接的usb有线耳机，另外一份日志拼过来的
[15:01:34]  connected devices:
[15:01:34]    [deviceinfo: type:0x4000000 (usb_headset) name:usb-audio - usb speaker phone addr:card=4;device=0 codec: 0 sensoruuid: null disabled modes: {}]
//（9）连接蓝牙耳机、有线耳机等外设音箱的日志
[18:57:21]events log: wired/a2dp/hearing aid device connection
。。。
[18:57:21]11-22 18:57:04:640 bt profile service: connecting hearing_aid profile
[18:57:21]11-22 18:57:04:666 bt profile service: connecting a2dp profile
[18:57:21]11-22 18:57:09:875 msg: onbluetoothactivedevicechange  state=2 addr=48:f3:f3:ed:78:ad prof=2 supprnoisy=true src=audioservice
[18:57:21]11-22 18:57:09:885 bt connected: addr=48:f3:f3:ed:78:ad profile=2 state=2 codec=audio_format_sbc
[18:57:21]11-22 18:57:10:074 a2dp device addr=48:f3:f3:ed:78:ad now available
//上面可以看到蓝牙连接的时间记录
//（10）声音通道占用的日志
[18:57:21]events log: force use (logged before setforceuse() is executed)
[18:57:21]11-22 18:54:07:774 setforceuse(for_dock, force_digital_dock) due to readdockaudiosettings
。。。
[18:57:21]11-22 18:54:08:521 setforceuse(for_vibrate_ringing, force_none) due to muteringermodestreams() from u/pid:1000/745
。。。
//从最后一行日志看，最后是设置为蓝牙通道的
[18:57:21]11-22 18:57:09:897 setforceuse(for_media, force_none) due to setbluetootha2dpon(true) from u/pid:1000/745 src:onsetbtactivedevice
//（11）声音变化和通道情况
[18:57:21]events log: volume changes (logged when command received by audioservice)
[18:57:21]11-22 18:57:09:885 volumestreamstate.muteinternally(stream:stream_music, muted)
[18:57:21]11-22 18:57:10:053 setdevicevolumebehavior: dev:bt_a2dp addr:48:f3:f3:ed:78:ad behavior:device_volume_behavior_variable pack:com.android.bluetooth
[18:57:21]11-22 18:57:10:156 avrcpsupportsabsolutevolume addr=48:f3:f3:ed:78:ad support=false
[18:57:21]11-22 18:57:10:323 volumestreamstate.muteinternally(stream:stream_music, unmuted)
//从上面日志看是蓝牙声音通道，stream_music 流
//（12）audiosystemadapter 不清楚是啥日志
[18:57:21]audiosystemadapter:
[18:57:21] last cache clear time: 11-22 18:57:10:110
[18:57:21] mdevicesforattrcache:
[18:57:21]        audioattributes: usage=usage_assistance_sonification content=content_type_unknown flags=0x800 tags= bundle=null forvolume: true stream: stream_system(1)
[18:57:21]                audiodeviceattributes: role:output type:bt_a2dp addr:48:f3:f3:ed:78:ad name: profiles:[] descriptors:[]
[18:57:21]        audioattributes: usage=usage_assistance_accessibility content=content_type_unknown flags=0x800 tags= bundle=null forvolume: true stream: stream_accessibility(10)
[18:57:21]                audiodeviceattributes: role:output type:bt_a2dp addr:48:f3:f3:ed:78:ad name: profiles:[] descriptors:[]
[18:57:21]        audioattributes: usage=usage_unknown content=content_type_unknown flags=0x801 tags= bundle=null forvolume: true stream: stream_system(1)
[18:57:21]                audiodeviceattributes: role:output type:speaker addr: name: profiles:[] descriptors:[]
[18:57:21]                audiodeviceattributes: role:output type:bt_a2dp addr:48:f3:f3:ed:78:ad name: profiles:[] descriptors:[]
。。。
百度查询到：audiosystemadapter可能会包含如下功能：
设备检测：检查设备是否支持特定音频特性（如蓝牙、耳机插孔等）。
音频路径管理：动态选择音频流的最佳路径，如扬声器、耳机或蓝牙设备。
音效处理：应用特定的音效效果，如均衡器设置或环绕声模式。
但是从上面日志看不出这些信息，可能信息比较隐蔽。

从上面的示例的主要日志信息，可以看到dumpsys主要包含当前音频流和外设的信息。

2、dumpsys audio日志的主要格式内容

# dumpsys audio //(1)执行命令
[18:57:20]events log: audio services lifecycle
//(2)audioservice 启动时间，大概可以推测出开机时间
[18:57:20]11-22 18:54:07:681 audioservice() 
//(3)dumpsys audio最重要的内容，设备支持声音流情况，正常看stream_music
[18:57:20]stream volumes (device: index)
[18:57:20]- stream_music: 
[18:57:20]   muted: false
[18:57:20]   muted internally: false
[18:57:20]   min: 0  //声音范围
[18:57:20]   max: 15
[18:57:20]   streamvolume:7 //当前声音大小
[18:57:20]   current: 2 (speaker): 7, 80 (bt_a2dp): 7, 400 (hdmi): 7, 40000000 (default): 7
[18:57:20]   devices: bt_a2dp(80) //当前声音通道，蓝牙
[18:57:20]   volume group: music
[18:57:20]
//(4)音频播放情况日志
[19:00:32]events log: playback activity as reported through
//(5)音频外设连接情况
[18:57:21]  connected devices:
//（6）声音通道占用的日志
[18:57:21]events log: force use (logged before setforceuse() is executed)
//（7）音频外设连接断开日志
[18:57:21]events log: wired/a2dp/hearing aid device connection
//（8）声音变化和通道情况
[18:57:21]events log: volume changes (logged when command received by audioservice)
//（9）audiosystemadapter 音频管理信息

这里只是根据一个实际的示例日志进行的讲解，
上面的讲解不一定完全正确和全面，仅供参考吧。

三、其他

1、dumpsys audio小结

dumpsys audio 主要能看到

当前设备音频流的指向情况，stream volumes (device: index)
当前系统音频外设连接情况，connected devices
声音通道占用情况记录，events log: force use
音频外设连接断开日志，events log: wired/a2dp/hearing aid device connection

dumpsys audio 最主要就是上面这几个声音相关信息。
更多的要看具体情况的日志了。

2、dumpsys audio 的源码

dumpsys audio 返回的打印信息，其实是java代码上打印的，具体源码如下：

framework/base/services/core/java/com/android/server/audio/audioservice.java

    @override
    protected void dump(filedescriptor fd, printwriter pw, string[] args) {
        if (!dumputils.checkdumppermission(mcontext, tag, pw)) return;
        slifecyclelogger.dump(pw);
        if (maudiohandler != null) {
            pw.println("\nmessage handler (watch for unhandled messages):");
            maudiohandler.dump(new printwriterprinter(pw), "  ");
        } else {
            pw.println("\nmessage handler is null");
        }
        ...
        pw.println("\naudio routes:");
        pw.print("  mmaintype=0x"); pw.println(integer.tohexstring(
                mdevicebroker.getcuraudioroutes().maintype));
        pw.print("  mbluetoothname="); pw.println(mdevicebroker.getcuraudioroutes().bluetoothname);
        ...
        pw.println("\n");
        pw.println("\nspatial audio:");
        pw.println("mhasspatializereffect:" + mhasspatializereffect + " (effect present)");
        pw.println("isspatializerenabled:" + isspatializerenabled() + " (routing dependent)");
        mspatializerhelper.dump(pw);
        sspatiallogger.dump(pw);
        maudiosystem.dump(pw);
    }

可以看到 dumpsys audio 命令返回的数据，都是在 audioservice.java 里面返回打印的；
audio相关数据很多，有兴趣的可以自己分析研究看看；
如果想要自定义添加一下额外的打印，可以在源码里面添加。

3、使用谷歌文件管理器 googlefile 播放音频文件日志：

logct | grep -e "audioservice|audiotrack"
//打开文件管理器后首次播放：
11-23 10:22:26.542   798  1614 i mediasessionstack: addsession to bottom of stack | record: com.google.android.apps.nbu.files/audioservice (userid=0)
11-23 10:22:26.938   798  1614 i audioservice.fadeoutmanager: unfadeoutuid() uid:10074
11-23 10:22:27.148   798   937 i mediasessionstack: onplaybackstatechanged - pushing session to top | record: com.google.android.apps.nbu.files/audioservice (userid=0)
11-23 10:22:27.635   798  1457 i activitymanager: background started fgs: allowed [callingpackage: com.google.android.apps.nbu.files; callinguid: 10074; uidstate: top ; uidbfsl: [bfsl]; intent: intent { cmp=com.google.android.apps.nbu.files/.mediaconsumption.audio.service.audioservice (has extras) }; code:proc_state_top; tempallowlistreason:<null>; targetsdkversion:34; callertargetsdkversion:34; startforegroundcount:0; bindfrompackage:null: isbindservice:true]
11-23 10:22:27.666   798   798 d mediasessionservice: media button session is changed to com.google.android.apps.nbu.files/audioservice (userid=0)
//停止后，再次点击播放
11-23 10:22:58.294  7108  7259 d audiotrack: gettimestamp_l(16): device stall time corrected using current time 2328289907108
11-23 10:22:58.339   798  1460 i mediasessionstack: onplaybackstatechanged - pushing session to top | record: com.google.android.apps.nbu.files/audioservice (userid=0)
11-23 10:22:58.344  7108  7259 d audiotrack: gettimestamp_l(16): stale timestamp time corrected, currenttimenanos: 2318205649000 < limitns: 2328189081941 < mstartns: 2328287081941
11-23 10:22:58.344  7108  7259 w audiotrack: gettimestamp_l(16): retrograde timestamp time corrected, 2328189081941 < 2328329633858

能看到一点日志，比如audiotrack播放时间，但是没有太多日志，比如用什么设备播放、播放音量等等信息。
所以dumpsys audio 还是可以看到当时比较有用的一些日志的。

4、android 的声音通道类型

其中streamtype定义如下：

stream_alarm：闹钟
stream_dtmf：双音多频,拨号键的声音
stream_music：音乐
stream_notification：通知
stream_ring：铃声
stream_system：系统
stream_voice_call：通话

android大概支持上面的声音通道类型，主要使用的是外放的 stream_music。

5、android–耳机插拔检测(framework篇)

上层到底层的一顿讲解

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Android adb shell dumpsys audio 信息查看分析详解