\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260202234841-698137d9b0e1c.png\")
<\/p>\n
\u56fe1 AudioFlinger\u5728\u97f3\u9891\u7cfb\u7edf\u4e2d\u4f4d\u7f6e<\/p>\n
\n
2. \u521d\u59cb\u5316<\/h3>\n
AudioFlinger\u4e0eAudioPolicyService\u540c\u5728main_audioserver.cpp\u88ab\u521d\u59cb\u5316，\u662faudioserver\u8fdb\u7a0b\u7684\u4e00\u90e8\u5206，\u4e0b\u9762\u662f\u521d\u59cb\u5316\u4ee3\u7801：<\/p>\n
int main(int argc __unused, char argv)
\n{
\n\u00a0\u00a0\u00a0\u00a0\u00a0 \u2026\u2026
\n\u00a0\u00a0\u00a0\u00a0sp<ProcessState> proc(ProcessState::self());
\n\u00a0\u00a0\u00a0\u00a0sp<IServiceManager> sm = defaultServiceManager();
\n\u00a0\u00a0\u00a0\u00a0ALOGI("ServiceManager: %p", sm.get());
\n\u00a0\u00a0\u00a0\u00a0AudioFlinger::instantiate();
\n\u00a0\u00a0\u00a0\u00a0AudioPolicyService::instantiate();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2026\u2026
\n\u00a0\u00a0\u00a0\u00a0ProcessState::self()->startThreadPool();
\n\u00a0\u00a0\u00a0\u00a0IPCThreadState::self()->joinThreadPool();
\n} <\/p>\n
\n
3.\u5bf9\u5916\u63a5\u53e3<\/h3>\n
AudioFlinger \u5c5e\u4e8e Server \u7aef，\u5bf9\u5916\u7684client\u548cHAL\u6709：<\/p>\n
Client: AudioTrack, AudioRecord, AudioSystem, AudioPolicyService<\/p>\n
Server: AudioFlinger (Binder Service)<\/p>\n
HAL: StreamHalInterface, AudioHwDevice<\/p>\n
\n
AF\u5bf9\u4e0a\u5c42\u63d0\u4f9bBinder\u670d\u52a1，\u4ece Android 12\/13 \u5f00\u59cb，\u4e3a\u4e86\u5c06Binder\u670d\u52a1\u4e0e\u5177\u4f53\u4e1a\u52a1\u5b9e\u73b0\u5206\u79bb，\u901a\u8fc7\u00a0Delegate\u00a0\u63a5\u53e3\u5b9a\u4e49\u6838\u5fc3\u529f\u80fd\u5951\u7ea6，\u6240\u4ee5AudioFlinger\u7ee7\u627f\u4e8eIAudioFlinger\u00a0 \u63a5\u53e3，\u800c\u4e0d\u662f\u76f4\u63a5\u7ee7\u627f\u4e8eBnAudioFlingerService，\u5982\u56fe2\u6240\u793a：<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260202234842-698137da16131.png\")
<\/p>\n
\u56fe2 AudioFlinger\u4e2d\u589e\u52a0Delegate\u4ee3\u7406<\/p>\n
\n
\n
4. \u5185\u90e8\u6838\u5fc3\u7c7b<\/h3>\n
\n
AudioFlinger \u5185\u90e8\u4e3b\u8981\u7531\u51e0\u79cd\u6838\u5fc3\u7ec4\u4ef6\u6784\u6210：<\/p>\n
- \n
- Binder Interface: IAudioFlinger \u63a5\u53e3\u5b9e\u73b0，\u5904\u7406 IPC \u8c03\u7528\u3002<\/li>\n
- Threads: \u7ba1\u7406\u4e0d\u540c\u8f93\u51fa\/\u8f93\u5165\u6d41\u7684\u7ebf\u7a0b (PlayBackThread, RecordThread)\u3002<\/li>\n
- Tracks: \u4ee3\u8868\u4e00\u4e2a\u97f3\u9891\u6d41\u7684\u6570\u636e\u6e90 (Track, RecordTrack)\u3002<\/li>\n
- Effects: \u97f3\u9891\u6548\u679c\u7ba1\u7406\u3002<\/li>\n
- PatchPanel: \u5904\u7406\u97f3\u9891\u8865\u4e01（Audio Patch），\u5b9e\u73b0\u590d\u6742\u7684\u8def\u7531\u529f\u80fd\u3002<\/li>\n<\/ul>\n
AudioFlinger \u7684\u4ee3\u7801\u7ed3\u6784\u4e3b\u8981\u56f4\u7ed5 AudioFlinger, Thread, Track \u4e09\u4e2a\u5c42\u7ea7\u5c55\u5f00\u3002<\/p>\n
\n
\u00a04.1 AudioFlinger \u7c7b<\/h4>\n
AudioFlinger \u662f\u6574\u4e2a\u670d\u52a1\u7684\u5165\u53e3，\u7ee7\u627f\u81ea BnAudioFlinger，\u5b9e\u73b0\u4e86 IAudioFlinger \u63a5\u53e3\u3002<\/p>\n
\u00a0 \u8d1f\u8d23\u521b\u5efa\u548c\u7ba1\u7406 PlaybackThread \u548c RecordThread\u3002<\/p>\n
\u00a0 \u8d1f\u8d23\u54cd\u5e94 createTrack\u3001openOutput \u7b49\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260202234842-698137da255ae.png\")
<\/p>\n\u56fe3<\/p>\n
\n
\u00a04.2 Thread \u7c7b\u4f53\u7cfb<\/h4>\n
\u5982\u56fe3\u6240\u793a，ThreadBase \u662f\u6240\u6709\u97f3\u9891\u5de5\u4f5c\u7ebf\u7a0b\u7684\u57fa\u7c7b\u3002<\/p>\n
\u00a0 PlaybackThread: \u8d1f\u8d23\u97f3\u9891\u64ad\u653e\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 MixerThread: \u6700\u5e38\u7528\u7684\u56de\u653e\u7ebf\u7a0b，\u8d1f\u8d23\u5c06\u591a\u4e2a Track \u7684\u97f3\u9891\u6570\u636e\u6df7\u5408（Mix）\u540e\u5199\u5165 HAL\u3002\u652f\u6301 FastMixer \u4ee5\u5b9e\u73b0\u4f4e\u5ef6\u8fdf\u64ad\u653e\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 DirectOutputThread: \u76f4\u63a5\u8f93\u51fa\u7ebf\u7a0b，\u4e0d\u7ecf\u8fc7\u8f6f\u4ef6\u6df7\u97f3，\u901a\u5e38\u7528\u4e8e HDMI \u900f\u4f20\u6216\u9ad8\u4fdd\u771f\u97f3\u4e50\u64ad\u653e\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 OffloadThread: \u5378\u8f7d\u7ebf\u7a0b，\u5c06\u89e3\u7801\u548c\u6df7\u97f3\u5de5\u4f5c\u4ea4\u7ed9 DSP\/\u786c\u4ef6\u5904\u7406\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 MmapThread: \u914d\u5408 AAudio \u4f7f\u7528，\u5b9e\u73b0 mmap \u65b9\u5f0f\u7684\u4f4e\u5ef6\u8fdf\u6570\u636e\u4f20\u8f93\u3002<\/p>\n
\u00a0 RecordThread: \u8d1f\u8d23\u97f3\u9891\u5f55\u5236，\u4ece HAL \u8bfb\u53d6\u6570\u636e\u5e76\u5206\u53d1\u7ed9 RecordTrack\u3002<\/p>\n
\n
\u00a04.3 Track \u7c7b\u4f53\u7cfb<\/h4>\n
TrackBase \u662f\u97f3\u9891\u6d41\u6570\u636e\u7684\u62bd\u8c61\u57fa\u7c7b\u3002<\/p>\n
\u00a0 Track: \u5bf9\u5e94 AudioTrack，\u5b58\u5728\u4e8e PlaybackThread \u4e2d\u3002\u5b83\u7ba1\u7406\u7740\u5171\u4eab\u5185\u5b58（SharedBuffer），Client \u7aef\u5f80\u91cc\u5199\u6570\u636e，Thread \u4ece\u91cc\u8bfb\u6570\u636e\u3002<\/p>\n
\u00a0 RecordTrack: \u5bf9\u5e94 AudioRecord，\u5b58\u5728\u4e8e RecordThread \u4e2d\u3002<\/p>\n
\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260202234842-698137dacdc7a.png\")
<\/p>\n\u56fe4 AudioTrack\u4e0eAudioFlinger\u91cc\u7684track<\/p>\n
\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260202234843-698137db3a7a2.png\")
<\/p>\n\u56fe5 AudioRecord\u4e0eAudioFlinger\u91cc\u7684Track<\/p>\n
\n
\n
\u00a05. \u6838\u5fc3\u6d41\u7a0b\u5206\u6790<\/h3>\n
\n
\u00a05.1 \u521b\u5efa Track (createTrack)<\/h4>\n
\n
\u8fd9\u662f\u64ad\u653e\u6d41\u7a0b\u7684\u8d77\u70b9\u3002<\/p>\n
1) \u5ba2\u6237\u7aef AudioTrack \u8c03\u7528 AudioSystem::getOutputForAttr\u3002<\/p>\n
2)\u00a0 AudioPolicyService \u6839\u636e\u7b56\u7565（\u8def\u7531\u3001\u91c7\u6837\u7387\u7b49）\u8fd4\u56de\u4e00\u4e2a Output Handle（\u5bf9\u5e94 AudioFlinger \u4e2d\u7684\u4e00\u4e2a Thread ID）\u3002<\/p>\n
3)\u00a0 \u5ba2\u6237\u7aef\u8c03\u7528 AudioFlinger::createTrack，\u4f20\u5165 Output Handle\u3002<\/p>\n
4)\u00a0 AudioFlinger \u6839\u636e Handle \u627e\u5230\u5bf9\u5e94\u7684 PlaybackThread\u3002<\/p>\n
5) \u8c03\u7528 PlaybackThread::createTrack_l \u521b\u5efa\u670d\u52a1\u7aef Track \u5bf9\u8c61\u3002<\/p>\n
6) \u8fd4\u56de IAudioTrack \u53e5\u67c4\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n
\n
\u00a05.2 \u56de\u653e\u7ebf\u7a0b\u5faa\u73af (MixerThread::threadLoop)<\/h4>\n
\n
MixerThread \u8fd0\u884c\u4e00\u4e2a\u6b7b\u5faa\u73af threadLoop:<\/p>\n
1)\u00a0 processConfigEvents: \u5904\u7406\u914d\u7f6e\u53d8\u66f4（\u5982\u91c7\u6837\u7387\u53d8\u5316\u3001\u8def\u7531\u53d8\u5316）\u3002<\/p>\n
2) \u00a0prepareTracks_l: \u904d\u5386\u6240\u6709 Track\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 \u68c0\u67e5 Track \u72b6\u6001（Active\/Stopped\/Paused）\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u53d6 Track \u7684 Buffer \u6570\u636e\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 \u5224\u65ad\u662f\u5426\u9700\u8981\u6df7\u97f3\u3002<\/p>\n
3) threadLoop_mix: \u4f7f\u7528 AudioMixer \u5c06\u6240\u6709 Active Track \u7684\u6570\u636e\u6df7\u5408\u5230\u4e00\u4e2a\u4e34\u65f6\u7684 Sink Buffer \u4e2d\u3002<\/p>\n
4)\u00a0 threadLoop_write: \u5c06\u6df7\u5408\u540e\u7684\u6570\u636e\u5199\u5165 AudioStreamOut (HAL)\u3002<\/p>\n
\n
\u5bf9\u4e8e\u4f4e\u5ef6\u8fdf\u573a\u666f，MixerThread \u4f1a\u521b\u5efa FastMixer \u7ebf\u7a0b\u3002\u666e\u901a Track \u7531 MixerThread \u5904\u7406，\u8bbe\u7f6e\u4e86 FAST \u6807\u5fd7\u7684 Track \u4f1a\u88ab FastMixer \u62a2\u5360\u5f0f\u8c03\u5ea6\u5904\u7406，\u76f4\u63a5\u5199\u5165 HAL \u6216\u901a\u8fc7 Pipe \u5199\u5165\u3002<\/p>\n
\n
\u00a05.3 \u5e8f\u5217\u56fe (UML)<\/h4>\n
\n
\u4ee5\u4e0b\u5c55\u793a\u4e86 createTrack \u548c write (\u64ad\u653e) \u7684\u7b80\u8981\u65f6\u5e8f\u3002<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260202234843-698137db9b217.png\")
<\/p>\n\u56fe6 createtrack\u65f6\u5e8f<\/p>\n
\n
\u00a06. \u603b\u7ed3<\/h3>\n
\n
AudioFlinger \u662f Android \u97f3\u9891\u67b6\u6784\u4e2d\u627f\u4e0a\u542f\u4e0b\u7684\u67a2\u7ebd\u3002\u901a\u8fc7\u591a\u7ebf\u7a0b\u6a21\u578b（Mixer, Direct, Record\u7b49），\u5b83\u9ad8\u6548\u5730\u7ba1\u7406\u7740\u7cfb\u7edf\u4e2d\u7684\u5e76\u53d1\u97f3\u9891\u6d41\u3002\u901a\u8fc7\u5171\u4eab\u5185\u5b58\u673a\u5236，\u5b83\u5b9e\u73b0\u4e86 Client \u4e0e Server \u95f4\u7684\u9ad8\u6548\u6570\u636e\u4f20\u8f93\u3002\u7406\u89e3 AudioFlinger \u7684\u5173\u952e\u5728\u4e8e\u638c\u63e1 ThreadLoop \u7684\u8c03\u5ea6\u673a\u5236\u4ee5\u53ca Track \u7684\u751f\u547d\u5468\u671f\u7ba1\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u5f55
\n1. \u7b80\u8ff0
\n2. \u521d\u59cb\u5316
\n3.\u5bf9\u5916\u63a5\u53e3
\n4. \u5185\u90e8\u6838\u5fc3\u7c7b 4.1 AudioFlinger \u7c7b 4.2 Thread \u7c7b\u4f53\u7cfb 4.3 Track \u7c7b\u4f53\u7cfb 5. \u6838\u5fc3\u6d41\u7a0b\u5206\u6790 5.1 \u521b\u5efa Track (createTrack) 5.2 \u56de\u653e\u7ebf\u7a0b\u5faa\u73af (MixerThread::threadLoop) 5.3 \u5e8f\u5217\u56fe (UML) 6. \u603b\u7ed3 1. \u7b80\u8ff0 AudioFlinger，\u7b80\u79f0AF，\u5b83 \u662f Android \u97f3\u9891\u7cfb\u7edf\u7684\u6838\u5fc3\u670d\u52a1&#x<\/p>\n","protected":false},"author":2,"featured_media":71094,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7471,7474,7473,7475,7472],"topic":[],"class_list":["post-71100","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-audioflinger","tag-audiopolicy","tag-audiotrack","tag-7475","tag-7472"],"yoast_head":"\nAndroid\u97f3\u9891\u7cfb\u5217(10)-AudioFlinger\u4ee3\u7801\u89e3\u6790 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/71100.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Android\u97f3\u9891\u7cfb\u5217(10)-AudioFlinger\u4ee3\u7801\u89e3\u6790 - 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