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/AudioSystem.h> 21#include <media/AudioPolicy.h> 22#include <utils/String8.h> 23 24namespace android { 25 26// ---------------------------------------------------------------------------- 27 28// The AudioPolicyInterface and AudioPolicyClientInterface classes define the communication interfaces 29// between the platform specific audio policy manager and Android generic audio policy manager. 30// The platform specific audio policy manager must implement methods of the AudioPolicyInterface class. 31// This implementation makes use of the AudioPolicyClientInterface to control the activity and 32// configuration of audio input and output streams. 33// 34// The platform specific audio policy manager is in charge of the audio routing and volume control 35// policies for a given platform. 36// The main roles of this module are: 37// - keep track of current system state (removable device connections, phone state, user requests...). 38// System state changes and user actions are notified to audio policy manager with methods of the AudioPolicyInterface. 39// - process getOutput() queries received when AudioTrack objects are created: Those queries 40// return a handler on an output that has been selected, configured and opened by the audio policy manager and that 41// must be used by the AudioTrack when registering to the AudioFlinger with the createTrack() method. 42// When the AudioTrack object is released, a putOutput() query is received and the audio policy manager can decide 43// to close or reconfigure the output depending on other streams using this output and current system state. 44// - similarly process getInput() and putInput() queries received from AudioRecord objects and configure audio inputs. 45// - process volume control requests: the stream volume is converted from an index value (received from UI) to a float value 46// applicable to each output as a function of platform specific settings and current output route (destination device). It 47// also make sure that streams are not muted if not allowed (e.g. camera shutter sound in some countries). 48// 49// The platform specific audio policy manager is provided as a shared library by platform vendors (as for libaudio.so) 50// and is linked with libaudioflinger.so 51 52 53// Audio Policy Manager Interface 54class AudioPolicyInterface 55{ 56 57public: 58 typedef enum { 59 API_INPUT_INVALID = -1, 60 API_INPUT_LEGACY = 0,// e.g. audio recording from a microphone 61 API_INPUT_MIX_CAPTURE,// used for "remote submix", capture of the media to play it remotely 62 API_INPUT_MIX_EXT_POLICY_REROUTE,// used for platform audio rerouting, where mixes are 63 // handled by external and dynamically installed 64 // policies which reroute audio mixes 65 API_INPUT_TELEPHONY_RX, // used for capture from telephony RX path 66 } input_type_t; 67 68 enum { 69 API_INPUT_CONCURRENCY_NONE = 0, 70 API_INPUT_CONCURRENCY_CALL = (1 << 0), // Concurrency with a call 71 API_INPUT_CONCURRENCY_CAPTURE = (1 << 1), // Concurrency with another capture 72 73 API_INPUT_CONCURRENCY_ALL = (API_INPUT_CONCURRENCY_CALL | API_INPUT_CONCURRENCY_CAPTURE), 74 }; 75 76 typedef uint32_t concurrency_type__mask_t; 77 78public: 79 virtual ~AudioPolicyInterface() {} 80 // 81 // configuration functions 82 // 83 84 // indicate a change in device connection status 85 virtual status_t setDeviceConnectionState(audio_devices_t device, 86 audio_policy_dev_state_t state, 87 const char *device_address, 88 const char *device_name) = 0; 89 // retrieve a device connection status 90 virtual audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device, 91 const char *device_address) = 0; 92 // indicate a change in device configuration 93 virtual status_t handleDeviceConfigChange(audio_devices_t device, 94 const char *device_address, 95 const char *device_name) = 0; 96 // indicate a change in phone state. Valid phones states are defined by audio_mode_t 97 virtual void setPhoneState(audio_mode_t state) = 0; 98 // force using a specific device category for the specified usage 99 virtual void setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config) = 0; 100 // retrieve current device category forced for a given usage 101 virtual audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage) = 0; 102 // set a system property (e.g. camera sound always audible) 103 virtual void setSystemProperty(const char* property, const char* value) = 0; 104 // check proper initialization 105 virtual status_t initCheck() = 0; 106 107 // 108 // Audio routing query functions 109 // 110 111 // request an output appropriate for playback of the supplied stream type and parameters 112 virtual audio_io_handle_t getOutput(audio_stream_type_t stream, 113 uint32_t samplingRate, 114 audio_format_t format, 115 audio_channel_mask_t channelMask, 116 audio_output_flags_t flags, 117 const audio_offload_info_t *offloadInfo) = 0; 118 virtual status_t getOutputForAttr(const audio_attributes_t *attr, 119 audio_io_handle_t *output, 120 audio_session_t session, 121 audio_stream_type_t *stream, 122 uid_t uid, 123 const audio_config_t *config, 124 audio_output_flags_t flags, 125 int selectedDeviceId, 126 audio_port_handle_t *portId) = 0; 127 // indicates to the audio policy manager that the output starts being used by corresponding stream. 128 virtual status_t startOutput(audio_io_handle_t output, 129 audio_stream_type_t stream, 130 audio_session_t session) = 0; 131 // indicates to the audio policy manager that the output stops being used by corresponding stream. 132 virtual status_t stopOutput(audio_io_handle_t output, 133 audio_stream_type_t stream, 134 audio_session_t session) = 0; 135 // releases the output. 136 virtual void releaseOutput(audio_io_handle_t output, 137 audio_stream_type_t stream, 138 audio_session_t session) = 0; 139 140 // request an input appropriate for record from the supplied device with supplied parameters. 141 virtual status_t getInputForAttr(const audio_attributes_t *attr, 142 audio_io_handle_t *input, 143 audio_session_t session, 144 uid_t uid, 145 const audio_config_base_t *config, 146 audio_input_flags_t flags, 147 audio_port_handle_t selectedDeviceId, 148 input_type_t *inputType, 149 audio_port_handle_t *portId) = 0; 150 // indicates to the audio policy manager that the input starts being used. 151 virtual status_t startInput(audio_io_handle_t input, 152 audio_session_t session, 153 concurrency_type__mask_t *concurrency) = 0; 154 // indicates to the audio policy manager that the input stops being used. 155 virtual status_t stopInput(audio_io_handle_t input, 156 audio_session_t session) = 0; 157 // releases the input. 158 virtual void releaseInput(audio_io_handle_t input, 159 audio_session_t session) = 0; 160 161 // 162 // volume control functions 163 // 164 165 // initialises stream volume conversion parameters by specifying volume index range. 166 virtual void initStreamVolume(audio_stream_type_t stream, 167 int indexMin, 168 int indexMax) = 0; 169 170 // sets the new stream volume at a level corresponding to the supplied index for the 171 // supplied device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME means 172 // setting volume for all devices 173 virtual status_t setStreamVolumeIndex(audio_stream_type_t stream, 174 int index, 175 audio_devices_t device) = 0; 176 177 // retrieve current volume index for the specified stream and the 178 // specified device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME means 179 // querying the volume of the active device. 180 virtual status_t getStreamVolumeIndex(audio_stream_type_t stream, 181 int *index, 182 audio_devices_t device) = 0; 183 184 // return the strategy corresponding to a given stream type 185 virtual uint32_t getStrategyForStream(audio_stream_type_t stream) = 0; 186 187 // return the enabled output devices for the given stream type 188 virtual audio_devices_t getDevicesForStream(audio_stream_type_t stream) = 0; 189 190 // Audio effect management 191 virtual audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc) = 0; 192 virtual status_t registerEffect(const effect_descriptor_t *desc, 193 audio_io_handle_t io, 194 uint32_t strategy, 195 int session, 196 int id) = 0; 197 virtual status_t unregisterEffect(int id) = 0; 198 virtual status_t setEffectEnabled(int id, bool enabled) = 0; 199 200 virtual bool isStreamActive(audio_stream_type_t stream, uint32_t inPastMs = 0) const = 0; 201 virtual bool isStreamActiveRemotely(audio_stream_type_t stream, 202 uint32_t inPastMs = 0) const = 0; 203 virtual bool isSourceActive(audio_source_t source) const = 0; 204 205 //dump state 206 virtual status_t dump(int fd) = 0; 207 208 virtual bool isOffloadSupported(const audio_offload_info_t& offloadInfo) = 0; 209 210 virtual status_t listAudioPorts(audio_port_role_t role, 211 audio_port_type_t type, 212 unsigned int *num_ports, 213 struct audio_port *ports, 214 unsigned int *generation) = 0; 215 virtual status_t getAudioPort(struct audio_port *port) = 0; 216 virtual status_t createAudioPatch(const struct audio_patch *patch, 217 audio_patch_handle_t *handle, 218 uid_t uid) = 0; 219 virtual status_t releaseAudioPatch(audio_patch_handle_t handle, 220 uid_t uid) = 0; 221 virtual status_t listAudioPatches(unsigned int *num_patches, 222 struct audio_patch *patches, 223 unsigned int *generation) = 0; 224 virtual status_t setAudioPortConfig(const struct audio_port_config *config) = 0; 225 virtual void releaseResourcesForUid(uid_t uid) = 0; 226 227 virtual status_t acquireSoundTriggerSession(audio_session_t *session, 228 audio_io_handle_t *ioHandle, 229 audio_devices_t *device) = 0; 230 231 virtual status_t releaseSoundTriggerSession(audio_session_t session) = 0; 232 233 virtual status_t registerPolicyMixes(const Vector<AudioMix>& mixes) = 0; 234 virtual status_t unregisterPolicyMixes(Vector<AudioMix> mixes) = 0; 235 236 virtual status_t startAudioSource(const struct audio_port_config *source, 237 const audio_attributes_t *attributes, 238 audio_patch_handle_t *handle, 239 uid_t uid) = 0; 240 virtual status_t stopAudioSource(audio_patch_handle_t handle) = 0; 241 242 virtual status_t setMasterMono(bool mono) = 0; 243 virtual status_t getMasterMono(bool *mono) = 0; 244}; 245 246 247// Audio Policy client Interface 248class AudioPolicyClientInterface 249{ 250public: 251 virtual ~AudioPolicyClientInterface() {} 252 253 // 254 // Audio HW module functions 255 // 256 257 // loads a HW module. 258 virtual audio_module_handle_t loadHwModule(const char *name) = 0; 259 260 // 261 // Audio output Control functions 262 // 263 264 // opens an audio output with the requested parameters. The parameter values can indicate to use the default values 265 // in case the audio policy manager has no specific requirements for the output being opened. 266 // When the function returns, the parameter values reflect the actual values used by the audio hardware output stream. 267 // The audio policy manager can check if the proposed parameters are suitable or not and act accordingly. 268 virtual status_t openOutput(audio_module_handle_t module, 269 audio_io_handle_t *output, 270 audio_config_t *config, 271 audio_devices_t *devices, 272 const String8& address, 273 uint32_t *latencyMs, 274 audio_output_flags_t flags) = 0; 275 // creates a special output that is duplicated to the two outputs passed as arguments. The duplication is performed by 276 // a special mixer thread in the AudioFlinger. 277 virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1, audio_io_handle_t output2) = 0; 278 // closes the output stream 279 virtual status_t closeOutput(audio_io_handle_t output) = 0; 280 // suspends the output. When an output is suspended, the corresponding audio hardware output stream is placed in 281 // standby and the AudioTracks attached to the mixer thread are still processed but the output mix is discarded. 282 virtual status_t suspendOutput(audio_io_handle_t output) = 0; 283 // restores a suspended output. 284 virtual status_t restoreOutput(audio_io_handle_t output) = 0; 285 286 // 287 // Audio input Control functions 288 // 289 290 // opens an audio input 291 virtual status_t openInput(audio_module_handle_t module, 292 audio_io_handle_t *input, 293 audio_config_t *config, 294 audio_devices_t *device, 295 const String8& address, 296 audio_source_t source, 297 audio_input_flags_t flags) = 0; 298 // closes an audio input 299 virtual status_t closeInput(audio_io_handle_t input) = 0; 300 // 301 // misc control functions 302 // 303 304 // set a stream volume for a particular output. For the same user setting, a given stream type can have different volumes 305 // for each output (destination device) it is attached to. 306 virtual status_t setStreamVolume(audio_stream_type_t stream, float volume, audio_io_handle_t output, int delayMs = 0) = 0; 307 308 // invalidate a stream type, causing a reroute to an unspecified new output 309 virtual status_t invalidateStream(audio_stream_type_t stream) = 0; 310 311 // function enabling to send proprietary informations directly from audio policy manager to audio hardware interface. 312 virtual void setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs, int delayMs = 0) = 0; 313 // function enabling to receive proprietary informations directly from audio hardware interface to audio policy manager. 314 virtual String8 getParameters(audio_io_handle_t ioHandle, const String8& keys) = 0; 315 316 // request the playback of a tone on the specified stream: used for instance to replace notification sounds when playing 317 // over a telephony device during a phone call. 318 virtual status_t startTone(audio_policy_tone_t tone, audio_stream_type_t stream) = 0; 319 virtual status_t stopTone() = 0; 320 321 // set down link audio volume. 322 virtual status_t setVoiceVolume(float volume, int delayMs = 0) = 0; 323 324 // move effect to the specified output 325 virtual status_t moveEffects(audio_session_t session, 326 audio_io_handle_t srcOutput, 327 audio_io_handle_t dstOutput) = 0; 328 329 /* Create a patch between several source and sink ports */ 330 virtual status_t createAudioPatch(const struct audio_patch *patch, 331 audio_patch_handle_t *handle, 332 int delayMs) = 0; 333 334 /* Release a patch */ 335 virtual status_t releaseAudioPatch(audio_patch_handle_t handle, 336 int delayMs) = 0; 337 338 /* Set audio port configuration */ 339 virtual status_t setAudioPortConfig(const struct audio_port_config *config, int delayMs) = 0; 340 341 virtual void onAudioPortListUpdate() = 0; 342 343 virtual void onAudioPatchListUpdate() = 0; 344 345 virtual audio_unique_id_t newAudioUniqueId(audio_unique_id_use_t use) = 0; 346 347 virtual void onDynamicPolicyMixStateUpdate(String8 regId, int32_t state) = 0; 348 349 virtual void onRecordingConfigurationUpdate(int event, audio_session_t session, 350 audio_source_t source, 351 const struct audio_config_base *clientConfig, 352 const struct audio_config_base *deviceConfig, 353 audio_patch_handle_t patchHandle) = 0; 354}; 355 356extern "C" AudioPolicyInterface* createAudioPolicyManager(AudioPolicyClientInterface *clientInterface); 357extern "C" void destroyAudioPolicyManager(AudioPolicyInterface *interface); 358 359 360}; // namespace android 361 362#endif // ANDROID_AUDIOPOLICY_INTERFACE_H 363