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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