AudioFlinger.h revision 8ea16e4b0a7d398d26887c18675b3899de5d779d
1/* 2** 3** Copyright 2007, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18#ifndef ANDROID_AUDIO_FLINGER_H 19#define ANDROID_AUDIO_FLINGER_H 20 21#include <stdint.h> 22#include <sys/types.h> 23#include <limits.h> 24 25#include <common_time/cc_helper.h> 26 27#include <cutils/compiler.h> 28 29#include <media/IAudioFlinger.h> 30#include <media/IAudioFlingerClient.h> 31#include <media/IAudioTrack.h> 32#include <media/IAudioRecord.h> 33#include <media/AudioSystem.h> 34#include <media/AudioTrack.h> 35 36#include <utils/Atomic.h> 37#include <utils/Errors.h> 38#include <utils/threads.h> 39#include <utils/SortedVector.h> 40#include <utils/TypeHelpers.h> 41#include <utils/Vector.h> 42 43#include <binder/BinderService.h> 44#include <binder/MemoryDealer.h> 45 46#include <system/audio.h> 47#include <hardware/audio.h> 48#include <hardware/audio_policy.h> 49 50#include <media/AudioBufferProvider.h> 51#include <media/ExtendedAudioBufferProvider.h> 52#include "FastMixer.h" 53#include <media/nbaio/NBAIO.h> 54#include "AudioWatchdog.h" 55 56#include <powermanager/IPowerManager.h> 57 58#include <media/nbaio/NBLog.h> 59#include <private/media/AudioTrackShared.h> 60 61namespace android { 62 63struct audio_track_cblk_t; 64struct effect_param_cblk_t; 65class AudioMixer; 66class AudioBuffer; 67class AudioResampler; 68class FastMixer; 69class ServerProxy; 70 71// ---------------------------------------------------------------------------- 72 73// AudioFlinger has a hard-coded upper limit of 2 channels for capture and playback. 74// There is support for > 2 channel tracks down-mixed to 2 channel output via a down-mix effect. 75// Adding full support for > 2 channel capture or playback would require more than simply changing 76// this #define. There is an independent hard-coded upper limit in AudioMixer; 77// removing that AudioMixer limit would be necessary but insufficient to support > 2 channels. 78// The macro FCC_2 highlights some (but not all) places where there is are 2-channel assumptions. 79// Search also for "2", "left", "right", "[0]", "[1]", ">> 16", "<< 16", etc. 80#define FCC_2 2 // FCC_2 = Fixed Channel Count 2 81 82static const nsecs_t kDefaultStandbyTimeInNsecs = seconds(3); 83 84#define MAX_GAIN 4096.0f 85#define MAX_GAIN_INT 0x1000 86 87#define INCLUDING_FROM_AUDIOFLINGER_H 88 89class AudioFlinger : 90 public BinderService<AudioFlinger>, 91 public BnAudioFlinger 92{ 93 friend class BinderService<AudioFlinger>; // for AudioFlinger() 94public: 95 static const char* getServiceName() ANDROID_API { return "media.audio_flinger"; } 96 97 virtual status_t dump(int fd, const Vector<String16>& args); 98 99 // IAudioFlinger interface, in binder opcode order 100 virtual sp<IAudioTrack> createTrack( 101 audio_stream_type_t streamType, 102 uint32_t sampleRate, 103 audio_format_t format, 104 audio_channel_mask_t channelMask, 105 size_t *pFrameCount, 106 IAudioFlinger::track_flags_t *flags, 107 const sp<IMemory>& sharedBuffer, 108 audio_io_handle_t output, 109 pid_t tid, 110 int *sessionId, 111 String8& name, 112 int clientUid, 113 status_t *status /*non-NULL*/); 114 115 virtual sp<IAudioRecord> openRecord( 116 audio_io_handle_t input, 117 uint32_t sampleRate, 118 audio_format_t format, 119 audio_channel_mask_t channelMask, 120 size_t *pFrameCount, 121 IAudioFlinger::track_flags_t *flags, 122 pid_t tid, 123 int *sessionId, 124 status_t *status /*non-NULL*/); 125 126 virtual uint32_t sampleRate(audio_io_handle_t output) const; 127 virtual int channelCount(audio_io_handle_t output) const; 128 virtual audio_format_t format(audio_io_handle_t output) const; 129 virtual size_t frameCount(audio_io_handle_t output) const; 130 virtual uint32_t latency(audio_io_handle_t output) const; 131 132 virtual status_t setMasterVolume(float value); 133 virtual status_t setMasterMute(bool muted); 134 135 virtual float masterVolume() const; 136 virtual bool masterMute() const; 137 138 virtual status_t setStreamVolume(audio_stream_type_t stream, float value, 139 audio_io_handle_t output); 140 virtual status_t setStreamMute(audio_stream_type_t stream, bool muted); 141 142 virtual float streamVolume(audio_stream_type_t stream, 143 audio_io_handle_t output) const; 144 virtual bool streamMute(audio_stream_type_t stream) const; 145 146 virtual status_t setMode(audio_mode_t mode); 147 148 virtual status_t setMicMute(bool state); 149 virtual bool getMicMute() const; 150 151 virtual status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs); 152 virtual String8 getParameters(audio_io_handle_t ioHandle, const String8& keys) const; 153 154 virtual void registerClient(const sp<IAudioFlingerClient>& client); 155 156 virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, 157 audio_channel_mask_t channelMask) const; 158 159 virtual audio_io_handle_t openOutput(audio_module_handle_t module, 160 audio_devices_t *pDevices, 161 uint32_t *pSamplingRate, 162 audio_format_t *pFormat, 163 audio_channel_mask_t *pChannelMask, 164 uint32_t *pLatencyMs, 165 audio_output_flags_t flags, 166 const audio_offload_info_t *offloadInfo); 167 168 virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1, 169 audio_io_handle_t output2); 170 171 virtual status_t closeOutput(audio_io_handle_t output); 172 173 virtual status_t suspendOutput(audio_io_handle_t output); 174 175 virtual status_t restoreOutput(audio_io_handle_t output); 176 177 virtual audio_io_handle_t openInput(audio_module_handle_t module, 178 audio_devices_t *pDevices, 179 uint32_t *pSamplingRate, 180 audio_format_t *pFormat, 181 audio_channel_mask_t *pChannelMask); 182 183 virtual status_t closeInput(audio_io_handle_t input); 184 185 virtual status_t setStreamOutput(audio_stream_type_t stream, audio_io_handle_t output); 186 187 virtual status_t setVoiceVolume(float volume); 188 189 virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, 190 audio_io_handle_t output) const; 191 192 virtual uint32_t getInputFramesLost(audio_io_handle_t ioHandle) const; 193 194 virtual int newAudioSessionId(); 195 196 virtual void acquireAudioSessionId(int audioSession, pid_t pid); 197 198 virtual void releaseAudioSessionId(int audioSession, pid_t pid); 199 200 virtual status_t queryNumberEffects(uint32_t *numEffects) const; 201 202 virtual status_t queryEffect(uint32_t index, effect_descriptor_t *descriptor) const; 203 204 virtual status_t getEffectDescriptor(const effect_uuid_t *pUuid, 205 effect_descriptor_t *descriptor) const; 206 207 virtual sp<IEffect> createEffect( 208 effect_descriptor_t *pDesc, 209 const sp<IEffectClient>& effectClient, 210 int32_t priority, 211 audio_io_handle_t io, 212 int sessionId, 213 status_t *status /*non-NULL*/, 214 int *id, 215 int *enabled); 216 217 virtual status_t moveEffects(int sessionId, audio_io_handle_t srcOutput, 218 audio_io_handle_t dstOutput); 219 220 virtual audio_module_handle_t loadHwModule(const char *name); 221 222 virtual uint32_t getPrimaryOutputSamplingRate(); 223 virtual size_t getPrimaryOutputFrameCount(); 224 225 virtual status_t setLowRamDevice(bool isLowRamDevice); 226 227 virtual status_t onTransact( 228 uint32_t code, 229 const Parcel& data, 230 Parcel* reply, 231 uint32_t flags); 232 233 // end of IAudioFlinger interface 234 235 sp<NBLog::Writer> newWriter_l(size_t size, const char *name); 236 void unregisterWriter(const sp<NBLog::Writer>& writer); 237private: 238 static const size_t kLogMemorySize = 40 * 1024; 239 sp<MemoryDealer> mLogMemoryDealer; // == 0 when NBLog is disabled 240 // When a log writer is unregistered, it is done lazily so that media.log can continue to see it 241 // for as long as possible. The memory is only freed when it is needed for another log writer. 242 Vector< sp<NBLog::Writer> > mUnregisteredWriters; 243 Mutex mUnregisteredWritersLock; 244public: 245 246 class SyncEvent; 247 248 typedef void (*sync_event_callback_t)(const wp<SyncEvent>& event) ; 249 250 class SyncEvent : public RefBase { 251 public: 252 SyncEvent(AudioSystem::sync_event_t type, 253 int triggerSession, 254 int listenerSession, 255 sync_event_callback_t callBack, 256 wp<RefBase> cookie) 257 : mType(type), mTriggerSession(triggerSession), mListenerSession(listenerSession), 258 mCallback(callBack), mCookie(cookie) 259 {} 260 261 virtual ~SyncEvent() {} 262 263 void trigger() { Mutex::Autolock _l(mLock); if (mCallback) mCallback(this); } 264 bool isCancelled() const { Mutex::Autolock _l(mLock); return (mCallback == NULL); } 265 void cancel() { Mutex::Autolock _l(mLock); mCallback = NULL; } 266 AudioSystem::sync_event_t type() const { return mType; } 267 int triggerSession() const { return mTriggerSession; } 268 int listenerSession() const { return mListenerSession; } 269 wp<RefBase> cookie() const { return mCookie; } 270 271 private: 272 const AudioSystem::sync_event_t mType; 273 const int mTriggerSession; 274 const int mListenerSession; 275 sync_event_callback_t mCallback; 276 const wp<RefBase> mCookie; 277 mutable Mutex mLock; 278 }; 279 280 sp<SyncEvent> createSyncEvent(AudioSystem::sync_event_t type, 281 int triggerSession, 282 int listenerSession, 283 sync_event_callback_t callBack, 284 wp<RefBase> cookie); 285 286private: 287 class AudioHwDevice; // fwd declaration for findSuitableHwDev_l 288 289 audio_mode_t getMode() const { return mMode; } 290 291 bool btNrecIsOff() const { return mBtNrecIsOff; } 292 293 AudioFlinger() ANDROID_API; 294 virtual ~AudioFlinger(); 295 296 // call in any IAudioFlinger method that accesses mPrimaryHardwareDev 297 status_t initCheck() const { return mPrimaryHardwareDev == NULL ? 298 NO_INIT : NO_ERROR; } 299 300 // RefBase 301 virtual void onFirstRef(); 302 303 AudioHwDevice* findSuitableHwDev_l(audio_module_handle_t module, 304 audio_devices_t devices); 305 void purgeStaleEffects_l(); 306 307 // standby delay for MIXER and DUPLICATING playback threads is read from property 308 // ro.audio.flinger_standbytime_ms or defaults to kDefaultStandbyTimeInNsecs 309 static nsecs_t mStandbyTimeInNsecs; 310 311 // incremented by 2 when screen state changes, bit 0 == 1 means "off" 312 // AudioFlinger::setParameters() updates, other threads read w/o lock 313 static uint32_t mScreenState; 314 315 // Internal dump utilities. 316 static const int kDumpLockRetries = 50; 317 static const int kDumpLockSleepUs = 20000; 318 static bool dumpTryLock(Mutex& mutex); 319 void dumpPermissionDenial(int fd, const Vector<String16>& args); 320 void dumpClients(int fd, const Vector<String16>& args); 321 void dumpInternals(int fd, const Vector<String16>& args); 322 323 // --- Client --- 324 class Client : public RefBase { 325 public: 326 Client(const sp<AudioFlinger>& audioFlinger, pid_t pid); 327 virtual ~Client(); 328 sp<MemoryDealer> heap() const; 329 pid_t pid() const { return mPid; } 330 sp<AudioFlinger> audioFlinger() const { return mAudioFlinger; } 331 332 bool reserveTimedTrack(); 333 void releaseTimedTrack(); 334 335 private: 336 Client(const Client&); 337 Client& operator = (const Client&); 338 const sp<AudioFlinger> mAudioFlinger; 339 const sp<MemoryDealer> mMemoryDealer; 340 const pid_t mPid; 341 342 Mutex mTimedTrackLock; 343 int mTimedTrackCount; 344 }; 345 346 // --- Notification Client --- 347 class NotificationClient : public IBinder::DeathRecipient { 348 public: 349 NotificationClient(const sp<AudioFlinger>& audioFlinger, 350 const sp<IAudioFlingerClient>& client, 351 pid_t pid); 352 virtual ~NotificationClient(); 353 354 sp<IAudioFlingerClient> audioFlingerClient() const { return mAudioFlingerClient; } 355 356 // IBinder::DeathRecipient 357 virtual void binderDied(const wp<IBinder>& who); 358 359 private: 360 NotificationClient(const NotificationClient&); 361 NotificationClient& operator = (const NotificationClient&); 362 363 const sp<AudioFlinger> mAudioFlinger; 364 const pid_t mPid; 365 const sp<IAudioFlingerClient> mAudioFlingerClient; 366 }; 367 368 class TrackHandle; 369 class RecordHandle; 370 class RecordThread; 371 class PlaybackThread; 372 class MixerThread; 373 class DirectOutputThread; 374 class OffloadThread; 375 class DuplicatingThread; 376 class AsyncCallbackThread; 377 class Track; 378 class RecordTrack; 379 class EffectModule; 380 class EffectHandle; 381 class EffectChain; 382 struct AudioStreamOut; 383 struct AudioStreamIn; 384 385 struct stream_type_t { 386 stream_type_t() 387 : volume(1.0f), 388 mute(false) 389 { 390 } 391 float volume; 392 bool mute; 393 }; 394 395 // --- PlaybackThread --- 396 397#include "Threads.h" 398 399#include "Effects.h" 400 401 // server side of the client's IAudioTrack 402 class TrackHandle : public android::BnAudioTrack { 403 public: 404 TrackHandle(const sp<PlaybackThread::Track>& track); 405 virtual ~TrackHandle(); 406 virtual sp<IMemory> getCblk() const; 407 virtual status_t start(); 408 virtual void stop(); 409 virtual void flush(); 410 virtual void pause(); 411 virtual status_t attachAuxEffect(int effectId); 412 virtual status_t allocateTimedBuffer(size_t size, 413 sp<IMemory>* buffer); 414 virtual status_t queueTimedBuffer(const sp<IMemory>& buffer, 415 int64_t pts); 416 virtual status_t setMediaTimeTransform(const LinearTransform& xform, 417 int target); 418 virtual status_t setParameters(const String8& keyValuePairs); 419 virtual status_t getTimestamp(AudioTimestamp& timestamp); 420 virtual void signal(); // signal playback thread for a change in control block 421 422 virtual status_t onTransact( 423 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags); 424 425 private: 426 const sp<PlaybackThread::Track> mTrack; 427 }; 428 429 // server side of the client's IAudioRecord 430 class RecordHandle : public android::BnAudioRecord { 431 public: 432 RecordHandle(const sp<RecordThread::RecordTrack>& recordTrack); 433 virtual ~RecordHandle(); 434 virtual sp<IMemory> getCblk() const; 435 virtual status_t start(int /*AudioSystem::sync_event_t*/ event, int triggerSession); 436 virtual void stop(); 437 virtual status_t onTransact( 438 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags); 439 private: 440 const sp<RecordThread::RecordTrack> mRecordTrack; 441 442 // for use from destructor 443 void stop_nonvirtual(); 444 }; 445 446 447 PlaybackThread *checkPlaybackThread_l(audio_io_handle_t output) const; 448 MixerThread *checkMixerThread_l(audio_io_handle_t output) const; 449 RecordThread *checkRecordThread_l(audio_io_handle_t input) const; 450 // no range check, AudioFlinger::mLock held 451 bool streamMute_l(audio_stream_type_t stream) const 452 { return mStreamTypes[stream].mute; } 453 // no range check, doesn't check per-thread stream volume, AudioFlinger::mLock held 454 float streamVolume_l(audio_stream_type_t stream) const 455 { return mStreamTypes[stream].volume; } 456 void audioConfigChanged_l(int event, audio_io_handle_t ioHandle, const void *param2); 457 458 // allocate an audio_io_handle_t, session ID, or effect ID 459 uint32_t nextUniqueId(); 460 461 status_t moveEffectChain_l(int sessionId, 462 PlaybackThread *srcThread, 463 PlaybackThread *dstThread, 464 bool reRegister); 465 // return thread associated with primary hardware device, or NULL 466 PlaybackThread *primaryPlaybackThread_l() const; 467 audio_devices_t primaryOutputDevice_l() const; 468 469 sp<PlaybackThread> getEffectThread_l(int sessionId, int EffectId); 470 471 472 void removeClient_l(pid_t pid); 473 void removeNotificationClient(pid_t pid); 474 475 bool isNonOffloadableGlobalEffectEnabled_l(); 476 void onNonOffloadableGlobalEffectEnable(); 477 478 class AudioHwDevice { 479 public: 480 enum Flags { 481 AHWD_CAN_SET_MASTER_VOLUME = 0x1, 482 AHWD_CAN_SET_MASTER_MUTE = 0x2, 483 }; 484 485 AudioHwDevice(const char *moduleName, 486 audio_hw_device_t *hwDevice, 487 Flags flags) 488 : mModuleName(strdup(moduleName)) 489 , mHwDevice(hwDevice) 490 , mFlags(flags) { } 491 /*virtual*/ ~AudioHwDevice() { free((void *)mModuleName); } 492 493 bool canSetMasterVolume() const { 494 return (0 != (mFlags & AHWD_CAN_SET_MASTER_VOLUME)); 495 } 496 497 bool canSetMasterMute() const { 498 return (0 != (mFlags & AHWD_CAN_SET_MASTER_MUTE)); 499 } 500 501 const char *moduleName() const { return mModuleName; } 502 audio_hw_device_t *hwDevice() const { return mHwDevice; } 503 private: 504 const char * const mModuleName; 505 audio_hw_device_t * const mHwDevice; 506 const Flags mFlags; 507 }; 508 509 // AudioStreamOut and AudioStreamIn are immutable, so their fields are const. 510 // For emphasis, we could also make all pointers to them be "const *", 511 // but that would clutter the code unnecessarily. 512 513 struct AudioStreamOut { 514 AudioHwDevice* const audioHwDev; 515 audio_stream_out_t* const stream; 516 const audio_output_flags_t flags; 517 518 audio_hw_device_t* hwDev() const { return audioHwDev->hwDevice(); } 519 520 AudioStreamOut(AudioHwDevice *dev, audio_stream_out_t *out, audio_output_flags_t flags) : 521 audioHwDev(dev), stream(out), flags(flags) {} 522 }; 523 524 struct AudioStreamIn { 525 AudioHwDevice* const audioHwDev; 526 audio_stream_in_t* const stream; 527 528 audio_hw_device_t* hwDev() const { return audioHwDev->hwDevice(); } 529 530 AudioStreamIn(AudioHwDevice *dev, audio_stream_in_t *in) : 531 audioHwDev(dev), stream(in) {} 532 }; 533 534 // for mAudioSessionRefs only 535 struct AudioSessionRef { 536 AudioSessionRef(int sessionid, pid_t pid) : 537 mSessionid(sessionid), mPid(pid), mCnt(1) {} 538 const int mSessionid; 539 const pid_t mPid; 540 int mCnt; 541 }; 542 543 mutable Mutex mLock; 544 545 DefaultKeyedVector< pid_t, wp<Client> > mClients; // see ~Client() 546 547 mutable Mutex mHardwareLock; 548 // NOTE: If both mLock and mHardwareLock mutexes must be held, 549 // always take mLock before mHardwareLock 550 551 // These two fields are immutable after onFirstRef(), so no lock needed to access 552 AudioHwDevice* mPrimaryHardwareDev; // mAudioHwDevs[0] or NULL 553 DefaultKeyedVector<audio_module_handle_t, AudioHwDevice*> mAudioHwDevs; 554 555 // for dump, indicates which hardware operation is currently in progress (but not stream ops) 556 enum hardware_call_state { 557 AUDIO_HW_IDLE = 0, // no operation in progress 558 AUDIO_HW_INIT, // init_check 559 AUDIO_HW_OUTPUT_OPEN, // open_output_stream 560 AUDIO_HW_OUTPUT_CLOSE, // unused 561 AUDIO_HW_INPUT_OPEN, // unused 562 AUDIO_HW_INPUT_CLOSE, // unused 563 AUDIO_HW_STANDBY, // unused 564 AUDIO_HW_SET_MASTER_VOLUME, // set_master_volume 565 AUDIO_HW_GET_ROUTING, // unused 566 AUDIO_HW_SET_ROUTING, // unused 567 AUDIO_HW_GET_MODE, // unused 568 AUDIO_HW_SET_MODE, // set_mode 569 AUDIO_HW_GET_MIC_MUTE, // get_mic_mute 570 AUDIO_HW_SET_MIC_MUTE, // set_mic_mute 571 AUDIO_HW_SET_VOICE_VOLUME, // set_voice_volume 572 AUDIO_HW_SET_PARAMETER, // set_parameters 573 AUDIO_HW_GET_INPUT_BUFFER_SIZE, // get_input_buffer_size 574 AUDIO_HW_GET_MASTER_VOLUME, // get_master_volume 575 AUDIO_HW_GET_PARAMETER, // get_parameters 576 AUDIO_HW_SET_MASTER_MUTE, // set_master_mute 577 AUDIO_HW_GET_MASTER_MUTE, // get_master_mute 578 }; 579 580 mutable hardware_call_state mHardwareStatus; // for dump only 581 582 583 DefaultKeyedVector< audio_io_handle_t, sp<PlaybackThread> > mPlaybackThreads; 584 stream_type_t mStreamTypes[AUDIO_STREAM_CNT]; 585 586 // member variables below are protected by mLock 587 float mMasterVolume; 588 bool mMasterMute; 589 // end of variables protected by mLock 590 591 DefaultKeyedVector< audio_io_handle_t, sp<RecordThread> > mRecordThreads; 592 593 DefaultKeyedVector< pid_t, sp<NotificationClient> > mNotificationClients; 594 volatile int32_t mNextUniqueId; // updated by android_atomic_inc 595 audio_mode_t mMode; 596 bool mBtNrecIsOff; 597 598 // protected by mLock 599 Vector<AudioSessionRef*> mAudioSessionRefs; 600 601 float masterVolume_l() const; 602 bool masterMute_l() const; 603 audio_module_handle_t loadHwModule_l(const char *name); 604 605 Vector < sp<SyncEvent> > mPendingSyncEvents; // sync events awaiting for a session 606 // to be created 607 608private: 609 sp<Client> registerPid_l(pid_t pid); // always returns non-0 610 611 // for use from destructor 612 status_t closeOutput_nonvirtual(audio_io_handle_t output); 613 status_t closeInput_nonvirtual(audio_io_handle_t input); 614 615#ifdef TEE_SINK 616 // all record threads serially share a common tee sink, which is re-created on format change 617 sp<NBAIO_Sink> mRecordTeeSink; 618 sp<NBAIO_Source> mRecordTeeSource; 619#endif 620 621public: 622 623#ifdef TEE_SINK 624 // tee sink, if enabled by property, allows dumpsys to write most recent audio to .wav file 625 static void dumpTee(int fd, const sp<NBAIO_Source>& source, audio_io_handle_t id = 0); 626 627 // whether tee sink is enabled by property 628 static bool mTeeSinkInputEnabled; 629 static bool mTeeSinkOutputEnabled; 630 static bool mTeeSinkTrackEnabled; 631 632 // runtime configured size of each tee sink pipe, in frames 633 static size_t mTeeSinkInputFrames; 634 static size_t mTeeSinkOutputFrames; 635 static size_t mTeeSinkTrackFrames; 636 637 // compile-time default size of tee sink pipes, in frames 638 // 0x200000 stereo 16-bit PCM frames = 47.5 seconds at 44.1 kHz, 8 megabytes 639 static const size_t kTeeSinkInputFramesDefault = 0x200000; 640 static const size_t kTeeSinkOutputFramesDefault = 0x200000; 641 static const size_t kTeeSinkTrackFramesDefault = 0x1000; 642#endif 643 644 // This method reads from a variable without mLock, but the variable is updated under mLock. So 645 // we might read a stale value, or a value that's inconsistent with respect to other variables. 646 // In this case, it's safe because the return value isn't used for making an important decision. 647 // The reason we don't want to take mLock is because it could block the caller for a long time. 648 bool isLowRamDevice() const { return mIsLowRamDevice; } 649 650private: 651 bool mIsLowRamDevice; 652 bool mIsDeviceTypeKnown; 653 nsecs_t mGlobalEffectEnableTime; // when a global effect was last enabled 654}; 655 656#undef INCLUDING_FROM_AUDIOFLINGER_H 657 658const char *formatToString(audio_format_t format); 659 660// ---------------------------------------------------------------------------- 661 662}; // namespace android 663 664#endif // ANDROID_AUDIO_FLINGER_H 665