Android与audio hal调用关系

安卓primary设备调用流程

• Hal audio
• 系统上下文

Hal audio

1. 第一步AudioFlinger
   eg: AudioFlinger::PatchPanel::createAudioPatch
   frameworks/av/services/audioflinger/PatchPanel.cpp
   /system/lib/ibaudioflinger.so

2. 第二步libaudiohal
   eg: DeviceHalHidl::createAudioPatch
   Android P:
   frameworks/av/media/libaudiohal/4.0/DeviceHalHidl.cpp
   /system/lib/libaudiohal@4.0.so
   Android Q:
   frameworks/av/media/libaudiohal/impl/DeviceHalHidl.cpp
   /system/lib/libaudiohal@5.0.so

3. 第三步impl
   eg: Device::createAudioPatch
   Android P:
   hardware/interfaces/audio/core/all-versions/default/include/core/all-versions/default/Device.impl.h
   /vendor/lib/hw/android.hardware.audio@4.0-impl.so
   Android Q:
   hardware/interfaces/audio/core/all-versions/default/Device.cpp
   /vendor/lib/hw/android.hardware.audio@5.0-impl.so

4. 第四步 audio hal
   eg: audio_hw.c create_audio_patch
   /vendor/lib/hw/audio.primary.xxx.so

系统上下文