AudioSystem.h revision f6778fd0c72ab54328f0e9f5ecf0017b73e99dd8
1/* 2 * Copyright (C) 2008 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_AUDIOSYSTEM_H_ 18#define ANDROID_AUDIOSYSTEM_H_ 19 20#include <hardware/audio_effect.h> 21#include <media/IAudioFlingerClient.h> 22#include <media/IAudioPolicyServiceClient.h> 23#include <system/audio.h> 24#include <system/audio_policy.h> 25#include <utils/Errors.h> 26#include <utils/Mutex.h> 27 28namespace android { 29 30typedef void (*audio_error_callback)(status_t err); 31 32class IAudioFlinger; 33class IAudioPolicyService; 34class String8; 35 36class AudioSystem 37{ 38public: 39 40 /* These are static methods to control the system-wide AudioFlinger 41 * only privileged processes can have access to them 42 */ 43 44 // mute/unmute microphone 45 static status_t muteMicrophone(bool state); 46 static status_t isMicrophoneMuted(bool *state); 47 48 // set/get master volume 49 static status_t setMasterVolume(float value); 50 static status_t getMasterVolume(float* volume); 51 52 // mute/unmute audio outputs 53 static status_t setMasterMute(bool mute); 54 static status_t getMasterMute(bool* mute); 55 56 // set/get stream volume on specified output 57 static status_t setStreamVolume(audio_stream_type_t stream, float value, 58 audio_io_handle_t output); 59 static status_t getStreamVolume(audio_stream_type_t stream, float* volume, 60 audio_io_handle_t output); 61 62 // mute/unmute stream 63 static status_t setStreamMute(audio_stream_type_t stream, bool mute); 64 static status_t getStreamMute(audio_stream_type_t stream, bool* mute); 65 66 // set audio mode in audio hardware 67 static status_t setMode(audio_mode_t mode); 68 69 // returns true in *state if tracks are active on the specified stream or have been active 70 // in the past inPastMs milliseconds 71 static status_t isStreamActive(audio_stream_type_t stream, bool *state, uint32_t inPastMs); 72 // returns true in *state if tracks are active for what qualifies as remote playback 73 // on the specified stream or have been active in the past inPastMs milliseconds. Remote 74 // playback isn't mutually exclusive with local playback. 75 static status_t isStreamActiveRemotely(audio_stream_type_t stream, bool *state, 76 uint32_t inPastMs); 77 // returns true in *state if a recorder is currently recording with the specified source 78 static status_t isSourceActive(audio_source_t source, bool *state); 79 80 // set/get audio hardware parameters. The function accepts a list of parameters 81 // key value pairs in the form: key1=value1;key2=value2;... 82 // Some keys are reserved for standard parameters (See AudioParameter class). 83 // The versions with audio_io_handle_t are intended for internal media framework use only. 84 static status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs); 85 static String8 getParameters(audio_io_handle_t ioHandle, const String8& keys); 86 // The versions without audio_io_handle_t are intended for JNI. 87 static status_t setParameters(const String8& keyValuePairs); 88 static String8 getParameters(const String8& keys); 89 90 static void setErrorCallback(audio_error_callback cb); 91 92 // helper function to obtain AudioFlinger service handle 93 static const sp<IAudioFlinger>& get_audio_flinger(); 94 95 static float linearToLog(int volume); 96 static int logToLinear(float volume); 97 98 // Returned samplingRate and frameCount output values are guaranteed 99 // to be non-zero if status == NO_ERROR 100 static status_t getOutputSamplingRate(uint32_t* samplingRate, 101 audio_stream_type_t stream); 102 static status_t getOutputFrameCount(size_t* frameCount, 103 audio_stream_type_t stream); 104 static status_t getOutputLatency(uint32_t* latency, 105 audio_stream_type_t stream); 106 static status_t getSamplingRate(audio_io_handle_t output, 107 uint32_t* samplingRate); 108 // returns the number of frames per audio HAL write buffer. Corresponds to 109 // audio_stream->get_buffer_size()/audio_stream_out_frame_size() 110 static status_t getFrameCount(audio_io_handle_t output, 111 size_t* frameCount); 112 // returns the audio output stream latency in ms. Corresponds to 113 // audio_stream_out->get_latency() 114 static status_t getLatency(audio_io_handle_t output, 115 uint32_t* latency); 116 117 // return status NO_ERROR implies *buffSize > 0 118 static status_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, 119 audio_channel_mask_t channelMask, size_t* buffSize); 120 121 static status_t setVoiceVolume(float volume); 122 123 // return the number of audio frames written by AudioFlinger to audio HAL and 124 // audio dsp to DAC since the specified output I/O handle has exited standby. 125 // returned status (from utils/Errors.h) can be: 126 // - NO_ERROR: successful operation, halFrames and dspFrames point to valid data 127 // - INVALID_OPERATION: Not supported on current hardware platform 128 // - BAD_VALUE: invalid parameter 129 // NOTE: this feature is not supported on all hardware platforms and it is 130 // necessary to check returned status before using the returned values. 131 static status_t getRenderPosition(audio_io_handle_t output, 132 uint32_t *halFrames, 133 uint32_t *dspFrames); 134 135 // return the number of input frames lost by HAL implementation, or 0 if the handle is invalid 136 static uint32_t getInputFramesLost(audio_io_handle_t ioHandle); 137 138 // Allocate a new unique ID for use as an audio session ID or I/O handle. 139 // If unable to contact AudioFlinger, returns AUDIO_UNIQUE_ID_ALLOCATE instead. 140 // FIXME If AudioFlinger were to ever exhaust the unique ID namespace, 141 // this method could fail by returning either AUDIO_UNIQUE_ID_ALLOCATE 142 // or an unspecified existing unique ID. 143 static audio_unique_id_t newAudioUniqueId(); 144 145 static void acquireAudioSessionId(int audioSession, pid_t pid); 146 static void releaseAudioSessionId(int audioSession, pid_t pid); 147 148 // Get the HW synchronization source used for an audio session. 149 // Return a valid source or AUDIO_HW_SYNC_INVALID if an error occurs 150 // or no HW sync source is used. 151 static audio_hw_sync_t getAudioHwSyncForSession(audio_session_t sessionId); 152 153 // types of io configuration change events received with ioConfigChanged() 154 enum io_config_event { 155 OUTPUT_OPENED, 156 OUTPUT_CLOSED, 157 OUTPUT_CONFIG_CHANGED, 158 INPUT_OPENED, 159 INPUT_CLOSED, 160 INPUT_CONFIG_CHANGED, 161 STREAM_CONFIG_CHANGED, 162 NUM_CONFIG_EVENTS 163 }; 164 165 // audio output descriptor used to cache output configurations in client process to avoid 166 // frequent calls through IAudioFlinger 167 class OutputDescriptor { 168 public: 169 OutputDescriptor() 170 : samplingRate(0), format(AUDIO_FORMAT_DEFAULT), channelMask(0), frameCount(0), latency(0) 171 {} 172 173 uint32_t samplingRate; 174 audio_format_t format; 175 audio_channel_mask_t channelMask; 176 size_t frameCount; 177 uint32_t latency; 178 }; 179 180 // Events used to synchronize actions between audio sessions. 181 // For instance SYNC_EVENT_PRESENTATION_COMPLETE can be used to delay recording start until 182 // playback is complete on another audio session. 183 // See definitions in MediaSyncEvent.java 184 enum sync_event_t { 185 SYNC_EVENT_SAME = -1, // used internally to indicate restart with same event 186 SYNC_EVENT_NONE = 0, 187 SYNC_EVENT_PRESENTATION_COMPLETE, 188 189 // 190 // Define new events here: SYNC_EVENT_START, SYNC_EVENT_STOP, SYNC_EVENT_TIME ... 191 // 192 SYNC_EVENT_CNT, 193 }; 194 195 // Timeout for synchronous record start. Prevents from blocking the record thread forever 196 // if the trigger event is not fired. 197 static const uint32_t kSyncRecordStartTimeOutMs = 30000; 198 199 // 200 // IAudioPolicyService interface (see AudioPolicyInterface for method descriptions) 201 // 202 static status_t setDeviceConnectionState(audio_devices_t device, audio_policy_dev_state_t state, 203 const char *device_address); 204 static audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device, 205 const char *device_address); 206 static status_t setPhoneState(audio_mode_t state); 207 static status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config); 208 static audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage); 209 210 // Client must successfully hand off the handle reference to AudioFlinger via createTrack(), 211 // or release it with releaseOutput(). 212 static audio_io_handle_t getOutput(audio_stream_type_t stream, 213 uint32_t samplingRate = 0, 214 audio_format_t format = AUDIO_FORMAT_DEFAULT, 215 audio_channel_mask_t channelMask = AUDIO_CHANNEL_OUT_STEREO, 216 audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE, 217 const audio_offload_info_t *offloadInfo = NULL); 218 static audio_io_handle_t getOutputForAttr(const audio_attributes_t *attr, 219 uint32_t samplingRate = 0, 220 audio_format_t format = AUDIO_FORMAT_DEFAULT, 221 audio_channel_mask_t channelMask = AUDIO_CHANNEL_OUT_STEREO, 222 audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE, 223 const audio_offload_info_t *offloadInfo = NULL); 224 static status_t startOutput(audio_io_handle_t output, 225 audio_stream_type_t stream, 226 int session); 227 static status_t stopOutput(audio_io_handle_t output, 228 audio_stream_type_t stream, 229 int session); 230 static void releaseOutput(audio_io_handle_t output); 231 232 // Client must successfully hand off the handle reference to AudioFlinger via openRecord(), 233 // or release it with releaseInput(). 234 static audio_io_handle_t getInput(audio_source_t inputSource, 235 uint32_t samplingRate, 236 audio_format_t format, 237 audio_channel_mask_t channelMask, 238 int sessionId, 239 audio_input_flags_t); 240 241 static status_t startInput(audio_io_handle_t input, 242 audio_session_t session); 243 static status_t stopInput(audio_io_handle_t input, 244 audio_session_t session); 245 static void releaseInput(audio_io_handle_t input, 246 audio_session_t session); 247 static status_t initStreamVolume(audio_stream_type_t stream, 248 int indexMin, 249 int indexMax); 250 static status_t setStreamVolumeIndex(audio_stream_type_t stream, 251 int index, 252 audio_devices_t device); 253 static status_t getStreamVolumeIndex(audio_stream_type_t stream, 254 int *index, 255 audio_devices_t device); 256 257 static uint32_t getStrategyForStream(audio_stream_type_t stream); 258 static audio_devices_t getDevicesForStream(audio_stream_type_t stream); 259 260 static audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc); 261 static status_t registerEffect(const effect_descriptor_t *desc, 262 audio_io_handle_t io, 263 uint32_t strategy, 264 int session, 265 int id); 266 static status_t unregisterEffect(int id); 267 static status_t setEffectEnabled(int id, bool enabled); 268 269 // clear stream to output mapping cache (gStreamOutputMap) 270 // and output configuration cache (gOutputs) 271 static void clearAudioConfigCache(); 272 273 static const sp<IAudioPolicyService>& get_audio_policy_service(); 274 275 // helpers for android.media.AudioManager.getProperty(), see description there for meaning 276 static uint32_t getPrimaryOutputSamplingRate(); 277 static size_t getPrimaryOutputFrameCount(); 278 279 static status_t setLowRamDevice(bool isLowRamDevice); 280 281 // Check if hw offload is possible for given format, stream type, sample rate, 282 // bit rate, duration, video and streaming or offload property is enabled 283 static bool isOffloadSupported(const audio_offload_info_t& info); 284 285 // check presence of audio flinger service. 286 // returns NO_ERROR if binding to service succeeds, DEAD_OBJECT otherwise 287 static status_t checkAudioFlinger(); 288 289 /* List available audio ports and their attributes */ 290 static status_t listAudioPorts(audio_port_role_t role, 291 audio_port_type_t type, 292 unsigned int *num_ports, 293 struct audio_port *ports, 294 unsigned int *generation); 295 296 /* Get attributes for a given audio port */ 297 static status_t getAudioPort(struct audio_port *port); 298 299 /* Create an audio patch between several source and sink ports */ 300 static status_t createAudioPatch(const struct audio_patch *patch, 301 audio_patch_handle_t *handle); 302 303 /* Release an audio patch */ 304 static status_t releaseAudioPatch(audio_patch_handle_t handle); 305 306 /* List existing audio patches */ 307 static status_t listAudioPatches(unsigned int *num_patches, 308 struct audio_patch *patches, 309 unsigned int *generation); 310 /* Set audio port configuration */ 311 static status_t setAudioPortConfig(const struct audio_port_config *config); 312 313 314 static status_t acquireSoundTriggerSession(audio_session_t *session, 315 audio_io_handle_t *ioHandle, 316 audio_devices_t *device); 317 static status_t releaseSoundTriggerSession(audio_session_t session); 318 319 static audio_mode_t getPhoneState(); 320 321 // ---------------------------------------------------------------------------- 322 323 class AudioPortCallback : public RefBase 324 { 325 public: 326 327 AudioPortCallback() {} 328 virtual ~AudioPortCallback() {} 329 330 virtual void onAudioPortListUpdate() = 0; 331 virtual void onAudioPatchListUpdate() = 0; 332 virtual void onServiceDied() = 0; 333 334 }; 335 336 static void setAudioPortCallback(sp<AudioPortCallback> callBack); 337 338private: 339 340 class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient 341 { 342 public: 343 AudioFlingerClient() { 344 } 345 346 // DeathRecipient 347 virtual void binderDied(const wp<IBinder>& who); 348 349 // IAudioFlingerClient 350 351 // indicate a change in the configuration of an output or input: keeps the cached 352 // values for output/input parameters up-to-date in client process 353 virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2); 354 }; 355 356 class AudioPolicyServiceClient: public IBinder::DeathRecipient, 357 public BnAudioPolicyServiceClient 358 { 359 public: 360 AudioPolicyServiceClient() { 361 } 362 363 // DeathRecipient 364 virtual void binderDied(const wp<IBinder>& who); 365 366 // IAudioPolicyServiceClient 367 virtual void onAudioPortListUpdate(); 368 virtual void onAudioPatchListUpdate(); 369 }; 370 371 static sp<AudioFlingerClient> gAudioFlingerClient; 372 static sp<AudioPolicyServiceClient> gAudioPolicyServiceClient; 373 friend class AudioFlingerClient; 374 friend class AudioPolicyServiceClient; 375 376 static Mutex gLock; // protects gAudioFlinger and gAudioErrorCallback, 377 static Mutex gLockCache; // protects gOutputs, gPrevInSamplingRate, gPrevInFormat, 378 // gPrevInChannelMask and gInBuffSize 379 static Mutex gLockAPS; // protects gAudioPolicyService and gAudioPolicyServiceClient 380 static Mutex gLockAPC; // protects gAudioPortCallback 381 static sp<IAudioFlinger> gAudioFlinger; 382 static audio_error_callback gAudioErrorCallback; 383 384 static size_t gInBuffSize; 385 // previous parameters for recording buffer size queries 386 static uint32_t gPrevInSamplingRate; 387 static audio_format_t gPrevInFormat; 388 static audio_channel_mask_t gPrevInChannelMask; 389 390 static sp<IAudioPolicyService> gAudioPolicyService; 391 392 // list of output descriptors containing cached parameters 393 // (sampling rate, framecount, channel count...) 394 static DefaultKeyedVector<audio_io_handle_t, OutputDescriptor *> gOutputs; 395 396 static sp<AudioPortCallback> gAudioPortCallback; 397}; 398 399}; // namespace android 400 401#endif /*ANDROID_AUDIOSYSTEM_H_*/ 402