本文所寫內容是在高通芯片平臺相關代碼基礎上學習整理匯總，如有描述不當之處，歡迎指正！

1、SoundTrigger注冊喚醒監聽事件回調流程（SoundTrigger HAL層到ADSP層，不包括FWK層）

//(1)SoundTriggerSession 回調
vendor/qcom/opensource/audio-hal/st-hal/SoundTriggerSession.cpp
void SoundTriggerSession::GetRecognitionCallback(recognition_callback_t *callback)*callback = rec_callback_;//(2)StartRecognition()接口，關聯到 callback
int SoundTriggerSession::StartRecognition(const struct sound_trigger_recognition_config *config,recognition_callback_t callback,void *cookie,uint32_t version)rec_callback_ = callback;//(3)在pal_callback()中調用callback()將存放在sound_trigger_recognition_event 中的數據傳遞fwkint SoundTriggerSession::pal_callback(pal_stream_handle_t *stream_handle,uint32_t event_id,uint32_t *event_data,uint32_t event_size,uint64_t cookie)struct sound_trigger_recognition_event *st_event = nullptr;
recognition_callback_t callback;
session->GetRecognitionCallback(&callback);callback(st_event, session->GetCookie());//(4)在SoundTriggerDevice()中調用SoundTriggerSession::StartRecognition()
vendor/qcom/opensource/audio-hal/st-hal/SoundTriggerDevice.cpp
static int stdev_start_recognition(const struct sound_trigger_hw_device *dev,sound_model_handle_t sound_model_handle,const struct sound_trigger_recognition_config *config,recognition_callback_t callback,void *cookie)ATRACE_BEGIN("sthal: stdev_start_recognition");
status = st_session->StartRecognition(config, callback, cookie, hw_properties_extended.header.version);//(5)在SoundTriggerDevice::Init()中進行接口初始化
int SoundTriggerDevice::Init(hw_device_t **device, const hw_module_t *module)STHAL_DBG(LOG_TAG, "Register LSM HIDL service");device_->start_recognition = stdev_start_recognition;device_->stop_recognition = stdev_stop_recognition;//(6)SoundTriggerHw開啟監聽，調用SoundTriggerDevice::start_recognition()
hardware/interfaces/soundtrigger/2.3/default/SoundTriggerHw.cpp
Return<int32_t> SoundTriggerHw::startRecognition(int32_t modelHandle, const V2_0::ISoundTriggerHw::RecognitionConfig& config,const sp<V2_0::ISoundTriggerHwCallback>& /* callback */, int32_t /* cookie */)ret = mHwDevice->start_recognition(mHwDevice, client->getHalHandle(), halConfig,recognitionCallback_, client.get());//(7)SoundTriggerDetector 調用startRecognition()注冊回調給到HAL層
frameworks/base/media/java/android/media/soundtrigger/SoundTriggerDetector.java
public boolean startRecognition(@RecognitionFlags int recognitionFlags)
try {status = mSoundTriggerSession.startRecognition(mSoundModel,mRecognitionCallback, new RecognitionConfig(captureTriggerAudio,allowMultipleTriggers, null, null, audioCapabilities),runInBatterySaver);} catch (RemoteException e) {return false;}/*** This class should be constructed by the {@link SoundTriggerManager}.* @hide*/SoundTriggerDetector(ISoundTriggerSession soundTriggerSession,@NonNull GenericSoundModel soundModel,@NonNull Callback callback, @Nullable Handler handler) {mSoundTriggerSession = soundTriggerSession;mSoundModel = soundModel;mCallback = callback;if (handler == null) {mHandler = new MyHandler();} else {mHandler = new MyHandler(handler.getLooper());}mRecognitionCallback = new RecognitionCallback();}事件上報時有兩個結構體，一個是sound_trigger_recognition_config，這個是sound_trigger_recognition配置相關的；
還有一個sound_trigger_recognition_event，這個的英文注釋如下：Generic recognition event sent via recognition callback。
prebuilts/vndk/v32/arm/include/system/media/audio/include/system/sound_trigger.h
/** configuration for sound trigger capture session passed to start_recognition()*/struct sound_trigger_recognition_config {audio_io_handle_t    capture_handle;    /* IO handle that will be used for capture.N/A if capture_requested is false */audio_devices_t      capture_device;    /* input device requested for detection capture */bool                 capture_requested; /* capture and buffer audio for this recognitioninstance */unsigned int         num_phrases;   /* number of key phrases recognition extras */struct sound_trigger_phrase_recognition_extra phrases[SOUND_TRIGGER_MAX_PHRASES];/* configuration for each key phrase */unsigned int        data_size;         /* size of opaque capture configuration data */unsigned int        data_offset;       /* offset of opaque data start from start of this struct(e.g sizeof struct sound_trigger_recognition_config) */};Generic recognition event sent via recognition callbackstruct __attribute__((aligned(8))) sound_trigger_recognition_event {int                              status;            /* recognition status e.g.RECOGNITION_STATUS_SUCCESS */sound_trigger_sound_model_type_t type;              /* event type, same as sound model type.e.g. SOUND_MODEL_TYPE_KEYPHRASE */sound_model_handle_t             model;             /* loaded sound model that triggered theevent */bool                             capture_available; /* it is possible to capture audio from thisutterance buffered by theimplementation */int                              capture_session;   /* audio session ID. framework use */int                              capture_delay_ms;  /* delay in ms between end of modeldetection and start of audio availablefor capture. A negative value is possible(e.g. if key phrase is also available forcapture */int                              capture_preamble_ms; /* duration in ms of audio capturedbefore the start of the trigger.0 if none. */bool                             trigger_in_data; /* the opaque data is the capture ofthe trigger sound */audio_config_t                   audio_config;        /* audio format of either the trigger inevent data or to use for capture of therest of the utterance */unsigned int                     data_size;         /* size of opaque event data */unsigned int                     data_offset;       /* offset of opaque data start from start ofthis struct (e.g sizeof structsound_trigger_phrase_recognition_event) */};

SoundTriggerDetector調用startRecognition()時將事件監聽回調注冊到SoundTriggerHal層。

2、高通芯片AudioReach架構芯片平臺ADSP層喚醒事件上報流程

喚醒上報事件代碼時序（高通AudioReach架構芯片平臺）(1)喚醒模塊代碼上報喚醒事件
capi_wakeup_raise_event_to_dsp_client()me_ptr->cb_info.event_cb(me_ptr->cb_info.event_context,CAPI_EVENT_DATA_TO_DSP_CLIENT_V2, &event_info)CAPI_EVENT_DATA_TO_DSP_CLIENT_V2 = 15(2)capi的callback()回調接口處理此事件消息
gen_topo_capi_cb_handler.c
gen_topo_capi_callback_base(gen_topo_module_t *module_ptr,capi_event_id_t    id,capi_event_info_t *event_info_ptr)switch (id)case CAPI_EVENT_DATA_TO_DSP_CLIENT:case CAPI_EVENT_DATA_TO_DSP_CLIENT_V2:return ar_result_to_capi_err(topo_ptr->topo_to_cntr_vtable_ptr->handle_capi_event(module_ptr, id, event_info_ptr));ADSP.HT.5.8/adsp_proc/avs/fwk/spf/containers/spl_cntr/core/src/spl_cntr.c.handle_capi_event                           = spl_cntr_handle_capi_event,(3)調用spf框架的spl_cntr_handle_capi_event()
ADSP.HT.5.8/adsp_proc/avs/fwk/spf/containers/spl_cntr/core/src/spl_cntr_event_util.c
ar_result_t spl_cntr_handle_capi_event(gen_topo_module_t *module_ptr,capi_event_id_t    event_id,capi_event_info_t *event_info_ptr){spl_cntr_t *me_ptr = (spl_cntr_t *)GET_BASE_PTR(spl_cntr_t, topo, module_ptr->topo_ptr);ar_result_t result = AR_EOK;result = cu_handle_capi_event(&me_ptr->cu, &module_ptr->gu, event_id, event_info_ptr);return result;}cu_handle_capi_event()switch (event_id)case CAPI_EVENT_DATA_TO_DSP_CLIENT_V2:{result |= cu_handle_event_data_to_dsp_client_v2_topo_cb(cu_ptr, module_ptr, event_info_ptr);break;}(4)路由到spf框架的cu_handle_event_data_to_dsp_client_v2_topo_cb()接口
ADSP.HT.5.8/adsp_proc/avs/fwk/spf/containers/cmn/container_utils/core/src/cu_utils_island.c
/* Topo callback to handle module event to DSP client v2 */ar_result_t cu_handle_event_data_to_dsp_client_v2_topo_cb(cu_base_t *        cu_ptr,gu_module_t *      module_ptr,capi_event_info_t *event_info_ptr)capi_event_data_to_dsp_client_v2_t *payload_ptr =(capi_event_data_to_dsp_client_v2_t *)(event_info_ptr->payload.data_ptr);gpr_cmd_alloc_ext_v2_t args;args.heap_index    = dest_address.a.gpr_heap_index;args.src_domain_id = dest_address.a.dest_domain_id;args.dst_domain_id = dest_address.a.src_domain_id;args.src_port      = module_ptr->module_instance_id;args.dst_port      = dest_address.a.src_port;args.token         = payload_ptr->token;args.opcode        = APM_EVENT_MODULE_TO_CLIENT;args.payload_size  = sizeof(apm_module_event_t) + payload_ptr->payload.actual_data_len;args.client_data   = 0;args.ret_packet    = &event_packet_ptr;result             = __gpr_cmd_alloc_ext_v2(&args);//調用gpr接口發送gpr消息給到client端result = __gpr_cmd_async_send(event_packet_ptr);(5)調用gpr接口，為gpr消息申請分配對應的內存大小，
分配原則：先從靜態內存池分配，靜態分配失敗，再從動態內存分配，兩者都失敗，上報內存分配失敗。
ADSP.HT.5.8/adsp_proc/gpr/core/src/gpr_drv_island.c
uint32_t __gpr_cmd_alloc_ext_v2(gpr_cmd_alloc_ext_v2_t *args)rc = __gpr_cmd_alloc_v2(args->payload_size, args->heap_index, &new_packet);uint32_t __gpr_cmd_alloc_v2(uint32_t alloc_size, gpr_heap_index_t heap_index, gpr_packet_t **ret_packet)new_packet = (gpr_packet_t *)gpr_memq_alloc(block);// If packet couldnt not be allocated in static pool, check dynamic poolgpr_allocate_dynamic_packet(&new_packet, packet_size);