1# native_audio_routing_manager.h
2
3
4## Overview
5
6The **native_audio_routing_manager.h** file declares the functions related to an audio routing manager.
7
8You can use the functions to create an audio routing manager, register and deregister a callback to listen for device connection status changes, and release devices.
9
10**Library**: libohaudio.so
11
12**File to include**: <ohaudio/native_audio_routing_manager.h>
13
14**System capability**: SystemCapability.Multimedia.Audio.Core
15
16**Since**: 12
17
18**Related module**: [OHAudio](_o_h_audio.md)
19
20
21## Summary
22
23
24### Types
25
26| Name| Description| 
27| -------- | -------- |
28| typedef struct [OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) [OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) | Defines the struct of an audio routing manager, which is used for routing and device-related functions. | 
29| typedef int32_t(\* [OH_AudioRoutingManager_OnDeviceChangedCallback](_o_h_audio.md#oh_audioroutingmanager_ondevicechangedcallback)) ([OH_AudioDevice_ChangeType](_o_h_audio.md#oh_audiodevice_changetype) type, [OH_AudioDeviceDescriptorArray](_o_h___audio_device_descriptor_array.md) \*audioDeviceDescriptorArray) | Defines a pointer to the callback function that returns the changed audio device descriptor (possibly multiple descriptors). | 
30
31
32### Functions
33
34| Name| Description| 
35| -------- | -------- |
36| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioManager_GetAudioRoutingManager](_o_h_audio.md#oh_audiomanager_getaudioroutingmanager) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*\*audioRoutingManager) | Obtains the handle to an audio routing manager. The handle should be set as the first parameter in the routing-related functions. | 
37| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioRoutingManager_GetDevices](_o_h_audio.md#oh_audioroutingmanager_getdevices) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*audioRoutingManager, [OH_AudioDevice_Flag](_o_h_audio.md#oh_audiodevice_flag) deviceFlag, [OH_AudioDeviceDescriptorArray](_o_h___audio_device_descriptor_array.md) \*\*audioDeviceDescriptorArray) | Obtains available devices based on the device flag. | 
38| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioRoutingManager_GetAvailableDevices](_o_h_audio.md#oh_audioroutingmanager_getavailabledevices) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*audioRoutingManager, [OH_AudioDevice_Usage](_o_h_audio.md#oh_audiodevice_usage) deviceUsage, [OH_AudioDeviceDescriptorArray](_o_h___audio_device_descriptor_array.md) \*\*audioDeviceDescriptorArray) | Obtains the available audio devices.  | 
39| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioRoutingManager_GetPreferredOutputDevice](_o_h_audio.md#oh_audioroutingmanager_getpreferredoutputdevice) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*audioRoutingManager, [OH_AudioStream_Usage](_o_h_audio.md#oh_audiostream_usage) streamUsage, [OH_AudioDeviceDescriptorArray](_o_h___audio_device_descriptor_array.md) \*\*audioDeviceDescriptorArray) | Obtains the output device with the highest priority based on the usage scenario of an audio output stream. | 
40| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioRoutingManager_GetPreferredInputDevice](_o_h_audio.md#oh_audioroutingmanager_getpreferredinputdevice) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*audioRoutingManager, [OH_AudioStream_SourceType](_o_h_audio.md#oh_audiostream_sourcetype) sourceType, [OH_AudioDeviceDescriptorArray](_o_h___audio_device_descriptor_array.md) \*\*audioDeviceDescriptorArray) | Obtains the input device with the highest priority based on the usage scenario of an audio input stream. | 
41| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioRoutingManager_RegisterDeviceChangeCallback](_o_h_audio.md#oh_audioroutingmanager_registerdevicechangecallback) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*audioRoutingManager, [OH_AudioDevice_Flag](_o_h_audio.md#oh_audiodevice_flag) deviceFlag, [OH_AudioRoutingManager_OnDeviceChangedCallback](_o_h_audio.md#oh_audioroutingmanager_ondevicechangedcallback) callback) | Registers a callback to listen for device changes of an audio routing manager. | 
42| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioRoutingManager_UnregisterDeviceChangeCallback](_o_h_audio.md#oh_audioroutingmanager_unregisterdevicechangecallback) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*audioRoutingManager, [OH_AudioRoutingManager_OnDeviceChangedCallback](_o_h_audio.md#oh_audioroutingmanager_ondevicechangedcallback) callback) | Unregisters the callback used to listen for device changes of an audio routing manager. | 
43| [OH_AudioCommon_Result](_o_h_audio.md#oh_audiocommon_result) [OH_AudioRoutingManager_ReleaseDevices](_o_h_audio.md#oh_audioroutingmanager_releasedevices) ([OH_AudioRoutingManager](_o_h_audio.md#oh_audioroutingmanager) \*audioRoutingManager, [OH_AudioDeviceDescriptorArray](_o_h___audio_device_descriptor_array.md) \*audioDeviceDescriptorArray) | Releases audio devices available for an audio routing manager. | 
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