1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_AUDIOPOLICY_INTERFACE_H 18 #define ANDROID_AUDIOPOLICY_INTERFACE_H 19 20 #include <media/AudioCommonTypes.h> 21 #include <media/AudioContainers.h> 22 #include <media/AudioDeviceTypeAddr.h> 23 #include <media/AudioSystem.h> 24 #include <media/AudioPolicy.h> 25 #include <media/DeviceDescriptorBase.h> 26 #include <android/content/AttributionSourceState.h> 27 #include <utils/String8.h> 28 29 namespace android { 30 31 using content::AttributionSourceState; 32 33 // ---------------------------------------------------------------------------- 34 35 // The AudioPolicyInterface and AudioPolicyClientInterface classes define the communication 36 // interfaces between the platform specific audio policy manager and Android generic audio policy 37 // manager. 38 // The platform specific audio policy manager must implement methods of the AudioPolicyInterface 39 // class. 40 // This implementation makes use of the AudioPolicyClientInterface to control the activity and 41 // configuration of audio input and output streams. 42 // 43 // The platform specific audio policy manager is in charge of the audio routing and volume control 44 // policies for a given platform. 45 // The main roles of this module are: 46 // - keep track of current system state (removable device connections, phone state, 47 // user requests...). 48 // System state changes and user actions are notified to audio policy manager with methods of the 49 // AudioPolicyInterface. 50 // - process getOutput() queries received when AudioTrack objects are created: Those queries 51 // return a handler on an output that has been selected, configured and opened by the audio 52 // policy manager and that must be used by the AudioTrack when registering to the AudioFlinger 53 // with the createTrack() method. 54 // When the AudioTrack object is released, a putOutput() query is received and the audio policy 55 // manager can decide to close or reconfigure the output depending on other streams using this 56 // output and current system state. 57 // - similarly process getInput() and putInput() queries received from AudioRecord objects and 58 // configure audio inputs. 59 // - process volume control requests: the stream volume is converted from an index value 60 // (received from UI) to a float value applicable to each output as a function of platform 61 // specificsettings and current output route (destination device). It also make sure that streams 62 // are not muted if not allowed (e.g. camera shutter sound in some countries). 63 // 64 // The platform specific audio policy manager is provided as a shared library by platform vendors 65 // (as for libaudio.so) and is linked with libaudioflinger.so 66 // 67 // NOTE: by convention, the implementation of the AudioPolicyInterface in AudioPolicyManager does 68 // not have to perform any nullptr check on input arguments: The caller of this API is 69 // AudioPolicyService running in the same process and in charge of validating arguments received 70 // from incoming binder calls before calling AudioPolicyManager. 71 72 // Audio Policy Manager Interface 73 class AudioPolicyInterface 74 { 75 76 public: 77 typedef enum { 78 API_INPUT_INVALID = -1, 79 API_INPUT_LEGACY = 0,// e.g. audio recording from a microphone 80 API_INPUT_MIX_CAPTURE,// used for "remote submix" legacy mode (no DAP), 81 // capture of the media to play it remotely 82 API_INPUT_MIX_EXT_POLICY_REROUTE,// used for platform audio rerouting, where mixes are 83 // handled by external and dynamically installed 84 // policies which reroute audio mixes 85 API_INPUT_MIX_PUBLIC_CAPTURE_PLAYBACK, // used for playback capture with a MediaProjection 86 API_INPUT_TELEPHONY_RX, // used for capture from telephony RX path 87 } input_type_t; 88 89 typedef enum { 90 API_OUTPUT_INVALID = -1, 91 API_OUTPUT_LEGACY = 0,// e.g. audio playing to speaker 92 API_OUT_MIX_PLAYBACK, // used for "remote submix" playback of audio from remote source 93 // to local capture 94 API_OUTPUT_TELEPHONY_TX, // used for playback to telephony TX path 95 } output_type_t; 96 97 public: ~AudioPolicyInterface()98 virtual ~AudioPolicyInterface() {} 99 // 100 // configuration functions 101 // 102 103 // Informs APM that new HAL modules are available. This typically happens 104 // due to registration of an audio HAL service. 105 virtual void onNewAudioModulesAvailable() = 0; 106 107 // indicate a change in device connection status 108 virtual status_t setDeviceConnectionState(audio_policy_dev_state_t state, 109 const android::media::audio::common::AudioPort& port, 110 audio_format_t encodedFormat) = 0; 111 // retrieve a device connection status 112 virtual audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device, 113 const char *device_address) = 0; 114 // indicate a change in device configuration 115 virtual status_t handleDeviceConfigChange(audio_devices_t device, 116 const char *device_address, 117 const char *device_name, 118 audio_format_t encodedFormat) = 0; 119 // indicate a change in phone state. Valid phones states are defined by audio_mode_t 120 virtual void setPhoneState(audio_mode_t state) = 0; 121 // force using a specific device category for the specified usage 122 virtual void setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config) = 0; 123 // retrieve current device category forced for a given usage 124 virtual audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage) = 0; 125 // set a system property (e.g. camera sound always audible) 126 virtual void setSystemProperty(const char* property, const char* value) = 0; 127 // check proper initialization 128 virtual status_t initCheck() = 0; 129 130 // 131 // Audio routing query functions 132 // 133 134 // request an output appropriate for playback of the supplied stream type and parameters 135 virtual audio_io_handle_t getOutput(audio_stream_type_t stream) = 0; 136 virtual status_t getOutputForAttr(const audio_attributes_t *attr, 137 audio_io_handle_t *output, 138 audio_session_t session, 139 audio_stream_type_t *stream, 140 const AttributionSourceState& attributionSouce, 141 const audio_config_t *config, 142 audio_output_flags_t *flags, 143 audio_port_handle_t *selectedDeviceId, 144 audio_port_handle_t *portId, 145 std::vector<audio_io_handle_t> *secondaryOutputs, 146 output_type_t *outputType, 147 bool *isSpatialized) = 0; 148 // indicates to the audio policy manager that the output starts being used by corresponding 149 // stream. 150 virtual status_t startOutput(audio_port_handle_t portId) = 0; 151 // indicates to the audio policy manager that the output stops being used by corresponding 152 // stream. 153 virtual status_t stopOutput(audio_port_handle_t portId) = 0; 154 // releases the output, return true if the output descriptor is reopened. 155 virtual bool releaseOutput(audio_port_handle_t portId) = 0; 156 157 // request an input appropriate for record from the supplied device with supplied parameters. 158 virtual status_t getInputForAttr(const audio_attributes_t *attr, 159 audio_io_handle_t *input, 160 audio_unique_id_t riid, 161 audio_session_t session, 162 const AttributionSourceState& attributionSouce, 163 const audio_config_base_t *config, 164 audio_input_flags_t flags, 165 audio_port_handle_t *selectedDeviceId, 166 input_type_t *inputType, 167 audio_port_handle_t *portId) = 0; 168 // indicates to the audio policy manager that the input starts being used. 169 virtual status_t startInput(audio_port_handle_t portId) = 0; 170 // indicates to the audio policy manager that the input stops being used. 171 virtual status_t stopInput(audio_port_handle_t portId) = 0; 172 // releases the input. 173 virtual void releaseInput(audio_port_handle_t portId) = 0; 174 175 // 176 // volume control functions 177 // 178 179 // initialises stream volume conversion parameters by specifying volume index range. 180 virtual void initStreamVolume(audio_stream_type_t stream, 181 int indexMin, 182 int indexMax) = 0; 183 184 // sets the new stream volume at a level corresponding to the supplied index for the 185 // supplied device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME means 186 // setting volume for all devices 187 virtual status_t setStreamVolumeIndex(audio_stream_type_t stream, 188 int index, 189 audio_devices_t device) = 0; 190 191 // retrieve current volume index for the specified stream and the 192 // specified device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME means 193 // querying the volume of the active device. 194 virtual status_t getStreamVolumeIndex(audio_stream_type_t stream, 195 int *index, 196 audio_devices_t device) = 0; 197 198 virtual status_t setVolumeIndexForAttributes(const audio_attributes_t &attr, 199 int index, 200 audio_devices_t device) = 0; 201 virtual status_t getVolumeIndexForAttributes(const audio_attributes_t &attr, 202 int &index, 203 audio_devices_t device) = 0; 204 205 virtual status_t getMaxVolumeIndexForAttributes(const audio_attributes_t &attr, 206 int &index) = 0; 207 208 virtual status_t getMinVolumeIndexForAttributes(const audio_attributes_t &attr, 209 int &index) = 0; 210 211 // return the strategy corresponding to a given stream type 212 virtual product_strategy_t getStrategyForStream(audio_stream_type_t stream) = 0; 213 214 // retrieves the list of enabled output devices for the given audio attributes 215 virtual status_t getDevicesForAttributes(const audio_attributes_t &attr, 216 AudioDeviceTypeAddrVector *devices, 217 bool forVolume) = 0; 218 219 // Audio effect management 220 virtual audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc) = 0; 221 virtual status_t registerEffect(const effect_descriptor_t *desc, 222 audio_io_handle_t io, 223 product_strategy_t strategy, 224 int session, 225 int id) = 0; 226 virtual status_t unregisterEffect(int id) = 0; 227 virtual status_t setEffectEnabled(int id, bool enabled) = 0; 228 virtual status_t moveEffectsToIo(const std::vector<int>& ids, audio_io_handle_t io) = 0; 229 230 virtual bool isStreamActive(audio_stream_type_t stream, uint32_t inPastMs = 0) const = 0; 231 virtual bool isStreamActiveRemotely(audio_stream_type_t stream, 232 uint32_t inPastMs = 0) const = 0; 233 virtual bool isSourceActive(audio_source_t source) const = 0; 234 235 //dump state 236 virtual status_t dump(int fd) = 0; 237 238 virtual status_t setAllowedCapturePolicy(uid_t uid, audio_flags_mask_t flags) = 0; 239 virtual audio_offload_mode_t getOffloadSupport(const audio_offload_info_t& offloadInfo) = 0; 240 virtual bool isDirectOutputSupported(const audio_config_base_t& config, 241 const audio_attributes_t& attributes) = 0; 242 243 virtual status_t listAudioPorts(audio_port_role_t role, 244 audio_port_type_t type, 245 unsigned int *num_ports, 246 struct audio_port_v7 *ports, 247 unsigned int *generation) = 0; 248 virtual status_t getAudioPort(struct audio_port_v7 *port) = 0; 249 virtual status_t createAudioPatch(const struct audio_patch *patch, 250 audio_patch_handle_t *handle, 251 uid_t uid) = 0; 252 virtual status_t releaseAudioPatch(audio_patch_handle_t handle, 253 uid_t uid) = 0; 254 virtual status_t listAudioPatches(unsigned int *num_patches, 255 struct audio_patch *patches, 256 unsigned int *generation) = 0; 257 virtual status_t setAudioPortConfig(const struct audio_port_config *config) = 0; 258 virtual void releaseResourcesForUid(uid_t uid) = 0; 259 260 virtual status_t acquireSoundTriggerSession(audio_session_t *session, 261 audio_io_handle_t *ioHandle, 262 audio_devices_t *device) = 0; 263 264 virtual status_t releaseSoundTriggerSession(audio_session_t session) = 0; 265 266 virtual status_t registerPolicyMixes(const Vector<AudioMix>& mixes) = 0; 267 virtual status_t unregisterPolicyMixes(Vector<AudioMix> mixes) = 0; 268 269 virtual status_t setUidDeviceAffinities(uid_t uid, const AudioDeviceTypeAddrVector& devices) 270 = 0; 271 virtual status_t removeUidDeviceAffinities(uid_t uid) = 0; 272 273 virtual status_t setUserIdDeviceAffinities(int userId, 274 const AudioDeviceTypeAddrVector& devices) = 0; 275 virtual status_t removeUserIdDeviceAffinities(int userId) = 0; 276 277 virtual status_t startAudioSource(const struct audio_port_config *source, 278 const audio_attributes_t *attributes, 279 audio_port_handle_t *portId, 280 uid_t uid) = 0; 281 virtual status_t stopAudioSource(audio_port_handle_t portId) = 0; 282 283 virtual status_t setMasterMono(bool mono) = 0; 284 virtual status_t getMasterMono(bool *mono) = 0; 285 286 virtual float getStreamVolumeDB( 287 audio_stream_type_t stream, int index, audio_devices_t device) = 0; 288 289 virtual status_t getSurroundFormats(unsigned int *numSurroundFormats, 290 audio_format_t *surroundFormats, 291 bool *surroundFormatsEnabled) = 0; 292 293 virtual status_t getReportedSurroundFormats(unsigned int *numSurroundFormats, 294 audio_format_t *surroundFormats) = 0; 295 296 virtual status_t setSurroundFormatEnabled(audio_format_t audioFormat, bool enabled) = 0; 297 298 virtual bool isHapticPlaybackSupported() = 0; 299 300 virtual bool isUltrasoundSupported() = 0; 301 302 virtual status_t getHwOffloadFormatsSupportedForBluetoothMedia( 303 audio_devices_t device, std::vector<audio_format_t> *formats) = 0; 304 305 virtual void setAppState(audio_port_handle_t portId, app_state_t state) = 0; 306 307 virtual status_t listAudioProductStrategies(AudioProductStrategyVector &strategies) = 0; 308 309 virtual status_t getProductStrategyFromAudioAttributes( 310 const AudioAttributes &aa, product_strategy_t &productStrategy, 311 bool fallbackOnDefault) = 0; 312 313 virtual status_t listAudioVolumeGroups(AudioVolumeGroupVector &groups) = 0; 314 315 virtual status_t getVolumeGroupFromAudioAttributes( 316 const AudioAttributes &aa, volume_group_t &volumeGroup, bool fallbackOnDefault) = 0; 317 318 virtual bool isCallScreenModeSupported() = 0; 319 320 virtual status_t setDevicesRoleForStrategy(product_strategy_t strategy, 321 device_role_t role, 322 const AudioDeviceTypeAddrVector &devices) = 0; 323 324 virtual status_t removeDevicesRoleForStrategy(product_strategy_t strategy, 325 device_role_t role) = 0; 326 327 328 virtual status_t getDevicesForRoleAndStrategy(product_strategy_t strategy, 329 device_role_t role, 330 AudioDeviceTypeAddrVector &devices) = 0; 331 332 virtual status_t setDevicesRoleForCapturePreset(audio_source_t audioSource, 333 device_role_t role, 334 const AudioDeviceTypeAddrVector &devices) = 0; 335 336 virtual status_t addDevicesRoleForCapturePreset(audio_source_t audioSource, 337 device_role_t role, 338 const AudioDeviceTypeAddrVector &devices) = 0; 339 340 virtual status_t removeDevicesRoleForCapturePreset( 341 audio_source_t audioSource, device_role_t role, 342 const AudioDeviceTypeAddrVector& devices) = 0; 343 344 virtual status_t clearDevicesRoleForCapturePreset(audio_source_t audioSource, 345 device_role_t role) = 0; 346 347 virtual status_t getDevicesForRoleAndCapturePreset(audio_source_t audioSource, 348 device_role_t role, 349 AudioDeviceTypeAddrVector &devices) = 0; 350 351 /** 352 * Queries if some kind of spatialization will be performed if the audio playback context 353 * described by the provided arguments is present. 354 * The context is made of: 355 * - The audio attributes describing the playback use case. 356 * - The audio configuration describing the audio format, channels, sampling rate ... 357 * - The devices describing the sink audio device selected for playback. 358 * All arguments are optional and only the specified arguments are used to match against 359 * supported criteria. For instance, supplying no argument will tell if spatialization is 360 * supported or not in general. 361 * @param attr audio attributes describing the playback use case 362 * @param config audio configuration describing the audio format, channels, sampling rate... 363 * @param devices the sink audio device selected for playback 364 * @return true if spatialization is enabled for this context, 365 * false otherwise 366 */ 367 virtual bool canBeSpatialized(const audio_attributes_t *attr, 368 const audio_config_t *config, 369 const AudioDeviceTypeAddrVector &devices) const = 0; 370 371 /** 372 * Opens a specialized spatializer output if supported by the platform. 373 * If several spatializer output profiles exist, the one supporting the sink device 374 * corresponding to the provided audio attributes will be selected. 375 * Only one spatializer output stream can be opened at a time and an error is returned 376 * if one already exists. 377 * @param config audio format, channel mask and sampling rate to be used as the mixer 378 * configuration for the spatializer mixer created. 379 * @param attr audio attributes describing the playback use case that will drive the 380 * sink device selection 381 * @param output the IO handle of the output opened 382 * @return NO_ERROR if an output was opened, INVALID_OPERATION or BAD_VALUE otherwise 383 */ 384 virtual status_t getSpatializerOutput(const audio_config_base_t *config, 385 const audio_attributes_t *attr, 386 audio_io_handle_t *output) = 0; 387 388 /** 389 * Closes a previously opened specialized spatializer output. 390 * @param output the IO handle of the output to close. 391 * @return NO_ERROR if an output was closed, INVALID_OPERATION or BAD_VALUE otherwise 392 */ 393 virtual status_t releaseSpatializerOutput(audio_io_handle_t output) = 0; 394 395 /** 396 * Query how the direct playback is currently supported on the device. 397 * @param attr audio attributes describing the playback use case 398 * @param config audio configuration for the playback 399 * @param directMode out: a set of flags describing how the direct playback is currently 400 * supported on the device 401 * @return NO_ERROR in case of success, DEAD_OBJECT, NO_INIT, BAD_VALUE, PERMISSION_DENIED 402 * in case of error. 403 */ 404 virtual audio_direct_mode_t getDirectPlaybackSupport(const audio_attributes_t *attr, 405 const audio_config_t *config) = 0; 406 407 // retrieves the list of available direct audio profiles for the given audio attributes 408 virtual status_t getDirectProfilesForAttributes(const audio_attributes_t* attr, 409 AudioProfileVector& audioProfiles) = 0; 410 }; 411 412 // Audio Policy client Interface 413 class AudioPolicyClientInterface 414 { 415 public: ~AudioPolicyClientInterface()416 virtual ~AudioPolicyClientInterface() {} 417 418 // 419 // Audio HW module functions 420 // 421 422 // loads a HW module. 423 virtual audio_module_handle_t loadHwModule(const char *name) = 0; 424 425 // 426 // Audio output Control functions 427 // 428 429 // opens an audio output with the requested parameters. The parameter values can indicate to 430 // use the default values in case the audio policy manager has no specific requirements for the 431 // output being opened. 432 // When the function returns, the parameter values reflect the actual values used by the audio 433 // hardware output stream. 434 // The audio policy manager can check if the proposed parameters are suitable or not and act 435 // accordingly. 436 virtual status_t openOutput(audio_module_handle_t module, 437 audio_io_handle_t *output, 438 audio_config_t *halConfig, 439 audio_config_base_t *mixerConfig, 440 const sp<DeviceDescriptorBase>& device, 441 uint32_t *latencyMs, 442 audio_output_flags_t flags) = 0; 443 // creates a special output that is duplicated to the two outputs passed as arguments. 444 // The duplication is performed by a special mixer thread in the AudioFlinger. 445 virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1, 446 audio_io_handle_t output2) = 0; 447 // closes the output stream 448 virtual status_t closeOutput(audio_io_handle_t output) = 0; 449 // suspends the output. When an output is suspended, the corresponding audio hardware output 450 // stream is placed in standby and the AudioTracks attached to the mixer thread are still 451 // processed but the output mix is discarded. 452 virtual status_t suspendOutput(audio_io_handle_t output) = 0; 453 // restores a suspended output. 454 virtual status_t restoreOutput(audio_io_handle_t output) = 0; 455 456 // 457 // Audio input Control functions 458 // 459 460 // opens an audio input 461 virtual status_t openInput(audio_module_handle_t module, 462 audio_io_handle_t *input, 463 audio_config_t *config, 464 audio_devices_t *device, 465 const String8& address, 466 audio_source_t source, 467 audio_input_flags_t flags) = 0; 468 // closes an audio input 469 virtual status_t closeInput(audio_io_handle_t input) = 0; 470 // 471 // misc control functions 472 // 473 474 // set a stream volume for a particular output. For the same user setting, a given stream type 475 // can have different volumes 476 // for each output (destination device) it is attached to. 477 virtual status_t setStreamVolume(audio_stream_type_t stream, float volume, 478 audio_io_handle_t output, int delayMs = 0) = 0; 479 480 // invalidate a stream type, causing a reroute to an unspecified new output 481 virtual status_t invalidateStream(audio_stream_type_t stream) = 0; 482 483 // function enabling to send proprietary informations directly from audio policy manager to 484 // audio hardware interface. 485 virtual void setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs, 486 int delayMs = 0) = 0; 487 // function enabling to receive proprietary informations directly from audio hardware interface 488 // to audio policy manager. 489 virtual String8 getParameters(audio_io_handle_t ioHandle, const String8& keys) = 0; 490 491 // set down link audio volume. 492 virtual status_t setVoiceVolume(float volume, int delayMs = 0) = 0; 493 494 // move effect to the specified output 495 virtual status_t moveEffects(audio_session_t session, 496 audio_io_handle_t srcOutput, 497 audio_io_handle_t dstOutput) = 0; 498 499 virtual void setEffectSuspended(int effectId, 500 audio_session_t sessionId, 501 bool suspended) = 0; 502 503 /* Create a patch between several source and sink ports */ 504 virtual status_t createAudioPatch(const struct audio_patch *patch, 505 audio_patch_handle_t *handle, 506 int delayMs) = 0; 507 508 /* Release a patch */ 509 virtual status_t releaseAudioPatch(audio_patch_handle_t handle, 510 int delayMs) = 0; 511 512 /* Set audio port configuration */ 513 virtual status_t setAudioPortConfig(const struct audio_port_config *config, int delayMs) = 0; 514 515 virtual void onAudioPortListUpdate() = 0; 516 517 virtual void onAudioPatchListUpdate() = 0; 518 519 virtual void onAudioVolumeGroupChanged(volume_group_t group, int flags) = 0; 520 521 virtual audio_unique_id_t newAudioUniqueId(audio_unique_id_use_t use) = 0; 522 523 virtual void onDynamicPolicyMixStateUpdate(String8 regId, int32_t state) = 0; 524 525 virtual void onRecordingConfigurationUpdate(int event, 526 const record_client_info_t *clientInfo, 527 const audio_config_base_t *clientConfig, 528 std::vector<effect_descriptor_t> clientEffects, 529 const audio_config_base_t *deviceConfig, 530 std::vector<effect_descriptor_t> effects, 531 audio_patch_handle_t patchHandle, 532 audio_source_t source) = 0; 533 534 virtual void onRoutingUpdated() = 0; 535 536 // Used to notify AudioService that an error was encountering when reading 537 // the volume ranges, and that they should be re-initialized 538 virtual void onVolumeRangeInitRequest() = 0; 539 540 // Used to notify the sound trigger module that an audio capture is about to 541 // take place. This should typically result in any active recognition 542 // sessions to be preempted on modules that do not support sound trigger 543 // recognition concurrently with audio capture. 544 virtual void setSoundTriggerCaptureState(bool active) = 0; 545 546 virtual status_t getAudioPort(struct audio_port_v7 *port) = 0; 547 548 virtual status_t updateSecondaryOutputs( 549 const TrackSecondaryOutputsMap& trackSecondaryOutputs) = 0; 550 551 virtual status_t setDeviceConnectedState(const struct audio_port_v7 *port, bool connected) = 0; 552 }; 553 554 // These are the signatures of createAudioPolicyManager/destroyAudioPolicyManager 555 // methods respectively, expected by AudioPolicyService, needs to be exposed by 556 // libaudiopolicymanagercustom. 557 using CreateAudioPolicyManagerInstance = 558 AudioPolicyInterface* (*)(AudioPolicyClientInterface*); 559 using DestroyAudioPolicyManagerInstance = void (*)(AudioPolicyInterface*); 560 561 } // namespace android 562 563 #endif // ANDROID_AUDIOPOLICY_INTERFACE_H 564