AudioFlinger.h revision 377b2ec9a2885f9b6405b07ba900a9e3f4349c38 
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
63class audio_track_cblk_t;
64class 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 frameCount,
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);
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 frameCount,
121                                IAudioFlinger::track_flags_t *flags,
122                                pid_t tid,
123                                int *sessionId,
124                                status_t *status);
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);
197
198    virtual void releaseAudioSessionId(int audioSession);
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,
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 = 10 * 1024;
239    sp<MemoryDealer>    mLogMemoryDealer;   // == 0 when NBLog is disabled
240public:
241
242    class SyncEvent;
243
244    typedef void (*sync_event_callback_t)(const wp<SyncEvent>& event) ;
245
246    class SyncEvent : public RefBase {
247    public:
248        SyncEvent(AudioSystem::sync_event_t type,
249                  int triggerSession,
250                  int listenerSession,
251                  sync_event_callback_t callBack,
252                  void *cookie)
253        : mType(type), mTriggerSession(triggerSession), mListenerSession(listenerSession),
254          mCallback(callBack), mCookie(cookie)
255        {}
256
257        virtual ~SyncEvent() {}
258
259        void trigger() { Mutex::Autolock _l(mLock); if (mCallback) mCallback(this); }
260        bool isCancelled() const { Mutex::Autolock _l(mLock); return (mCallback == NULL); }
261        void cancel() { Mutex::Autolock _l(mLock); mCallback = NULL; }
262        AudioSystem::sync_event_t type() const { return mType; }
263        int triggerSession() const { return mTriggerSession; }
264        int listenerSession() const { return mListenerSession; }
265        void *cookie() const { return mCookie; }
266
267    private:
268          const AudioSystem::sync_event_t mType;
269          const int mTriggerSession;
270          const int mListenerSession;
271          sync_event_callback_t mCallback;
272          void * const mCookie;
273          mutable Mutex mLock;
274    };
275
276    sp<SyncEvent> createSyncEvent(AudioSystem::sync_event_t type,
277                                        int triggerSession,
278                                        int listenerSession,
279                                        sync_event_callback_t callBack,
280                                        void *cookie);
281
282private:
283    class AudioHwDevice;    // fwd declaration for findSuitableHwDev_l
284
285               audio_mode_t getMode() const { return mMode; }
286
287                bool        btNrecIsOff() const { return mBtNrecIsOff; }
288
289                            AudioFlinger() ANDROID_API;
290    virtual                 ~AudioFlinger();
291
292    // call in any IAudioFlinger method that accesses mPrimaryHardwareDev
293    status_t                initCheck() const { return mPrimaryHardwareDev == NULL ?
294                                                        NO_INIT : NO_ERROR; }
295
296    // RefBase
297    virtual     void        onFirstRef();
298
299    AudioHwDevice*          findSuitableHwDev_l(audio_module_handle_t module,
300                                                audio_devices_t devices);
301    void                    purgeStaleEffects_l();
302
303    // standby delay for MIXER and DUPLICATING playback threads is read from property
304    // ro.audio.flinger_standbytime_ms or defaults to kDefaultStandbyTimeInNsecs
305    static nsecs_t          mStandbyTimeInNsecs;
306
307    // incremented by 2 when screen state changes, bit 0 == 1 means "off"
308    // AudioFlinger::setParameters() updates, other threads read w/o lock
309    static uint32_t         mScreenState;
310
311    // Internal dump utilities.
312    static const int kDumpLockRetries = 50;
313    static const int kDumpLockSleepUs = 20000;
314    static bool dumpTryLock(Mutex& mutex);
315    void dumpPermissionDenial(int fd, const Vector<String16>& args);
316    void dumpClients(int fd, const Vector<String16>& args);
317    void dumpInternals(int fd, const Vector<String16>& args);
318
319    // --- Client ---
320    class Client : public RefBase {
321    public:
322                            Client(const sp<AudioFlinger>& audioFlinger, pid_t pid);
323        virtual             ~Client();
324        sp<MemoryDealer>    heap() const;
325        pid_t               pid() const { return mPid; }
326        sp<AudioFlinger>    audioFlinger() const { return mAudioFlinger; }
327
328        bool reserveTimedTrack();
329        void releaseTimedTrack();
330
331    private:
332                            Client(const Client&);
333                            Client& operator = (const Client&);
334        const sp<AudioFlinger> mAudioFlinger;
335        const sp<MemoryDealer> mMemoryDealer;
336        const pid_t         mPid;
337
338        Mutex               mTimedTrackLock;
339        int                 mTimedTrackCount;
340    };
341
342    // --- Notification Client ---
343    class NotificationClient : public IBinder::DeathRecipient {
344    public:
345                            NotificationClient(const sp<AudioFlinger>& audioFlinger,
346                                                const sp<IAudioFlingerClient>& client,
347                                                pid_t pid);
348        virtual             ~NotificationClient();
349
350                sp<IAudioFlingerClient> audioFlingerClient() const { return mAudioFlingerClient; }
351
352                // IBinder::DeathRecipient
353                virtual     void        binderDied(const wp<IBinder>& who);
354
355    private:
356                            NotificationClient(const NotificationClient&);
357                            NotificationClient& operator = (const NotificationClient&);
358
359        const sp<AudioFlinger>  mAudioFlinger;
360        const pid_t             mPid;
361        const sp<IAudioFlingerClient> mAudioFlingerClient;
362    };
363
364    class TrackHandle;
365    class RecordHandle;
366    class RecordThread;
367    class PlaybackThread;
368    class MixerThread;
369    class DirectOutputThread;
370    class OffloadThread;
371    class DuplicatingThread;
372    class AsyncCallbackThread;
373    class Track;
374    class RecordTrack;
375    class EffectModule;
376    class EffectHandle;
377    class EffectChain;
378    struct AudioStreamOut;
379    struct AudioStreamIn;
380
381    struct  stream_type_t {
382        stream_type_t()
383            :   volume(1.0f),
384                mute(false)
385        {
386        }
387        float       volume;
388        bool        mute;
389    };
390
391    // --- PlaybackThread ---
392
393#include "Threads.h"
394
395#include "Effects.h"
396
397    // server side of the client's IAudioTrack
398    class TrackHandle : public android::BnAudioTrack {
399    public:
400                            TrackHandle(const sp<PlaybackThread::Track>& track);
401        virtual             ~TrackHandle();
402        virtual sp<IMemory> getCblk() const;
403        virtual status_t    start();
404        virtual void        stop();
405        virtual void        flush();
406        virtual void        pause();
407        virtual status_t    attachAuxEffect(int effectId);
408        virtual status_t    allocateTimedBuffer(size_t size,
409                                                sp<IMemory>* buffer);
410        virtual status_t    queueTimedBuffer(const sp<IMemory>& buffer,
411                                             int64_t pts);
412        virtual status_t    setMediaTimeTransform(const LinearTransform& xform,
413                                                  int target);
414        virtual status_t    setParameters(const String8& keyValuePairs);
415        virtual status_t    getTimestamp(AudioTimestamp& timestamp);
416        virtual void        signal(); // signal playback thread for a change in control block
417
418        virtual status_t onTransact(
419            uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags);
420
421    private:
422        const sp<PlaybackThread::Track> mTrack;
423    };
424
425    // server side of the client's IAudioRecord
426    class RecordHandle : public android::BnAudioRecord {
427    public:
428        RecordHandle(const sp<RecordThread::RecordTrack>& recordTrack);
429        virtual             ~RecordHandle();
430        virtual sp<IMemory> getCblk() const;
431        virtual status_t    start(int /*AudioSystem::sync_event_t*/ event, int triggerSession);
432        virtual void        stop();
433        virtual status_t onTransact(
434            uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags);
435    private:
436        const sp<RecordThread::RecordTrack> mRecordTrack;
437
438        // for use from destructor
439        void                stop_nonvirtual();
440    };
441
442
443              PlaybackThread *checkPlaybackThread_l(audio_io_handle_t output) const;
444              MixerThread *checkMixerThread_l(audio_io_handle_t output) const;
445              RecordThread *checkRecordThread_l(audio_io_handle_t input) const;
446              // no range check, AudioFlinger::mLock held
447              bool streamMute_l(audio_stream_type_t stream) const
448                                { return mStreamTypes[stream].mute; }
449              // no range check, doesn't check per-thread stream volume, AudioFlinger::mLock held
450              float streamVolume_l(audio_stream_type_t stream) const
451                                { return mStreamTypes[stream].volume; }
452              void audioConfigChanged_l(int event, audio_io_handle_t ioHandle, const void *param2);
453
454              // allocate an audio_io_handle_t, session ID, or effect ID
455              uint32_t nextUniqueId();
456
457              status_t moveEffectChain_l(int sessionId,
458                                     PlaybackThread *srcThread,
459                                     PlaybackThread *dstThread,
460                                     bool reRegister);
461              // return thread associated with primary hardware device, or NULL
462              PlaybackThread *primaryPlaybackThread_l() const;
463              audio_devices_t primaryOutputDevice_l() const;
464
465              sp<PlaybackThread> getEffectThread_l(int sessionId, int EffectId);
466
467
468                void        removeClient_l(pid_t pid);
469                void        removeNotificationClient(pid_t pid);
470
471                bool isNonOffloadableGlobalEffectEnabled_l();
472                void onNonOffloadableGlobalEffectEnable();
473
474    class AudioHwDevice {
475    public:
476        enum Flags {
477            AHWD_CAN_SET_MASTER_VOLUME  = 0x1,
478            AHWD_CAN_SET_MASTER_MUTE    = 0x2,
479        };
480
481        AudioHwDevice(const char *moduleName,
482                      audio_hw_device_t *hwDevice,
483                      Flags flags)
484            : mModuleName(strdup(moduleName))
485            , mHwDevice(hwDevice)
486            , mFlags(flags) { }
487        /*virtual*/ ~AudioHwDevice() { free((void *)mModuleName); }
488
489        bool canSetMasterVolume() const {
490            return (0 != (mFlags & AHWD_CAN_SET_MASTER_VOLUME));
491        }
492
493        bool canSetMasterMute() const {
494            return (0 != (mFlags & AHWD_CAN_SET_MASTER_MUTE));
495        }
496
497        const char *moduleName() const { return mModuleName; }
498        audio_hw_device_t *hwDevice() const { return mHwDevice; }
499    private:
500        const char * const mModuleName;
501        audio_hw_device_t * const mHwDevice;
502        Flags mFlags;
503    };
504
505    // AudioStreamOut and AudioStreamIn are immutable, so their fields are const.
506    // For emphasis, we could also make all pointers to them be "const *",
507    // but that would clutter the code unnecessarily.
508
509    struct AudioStreamOut {
510        AudioHwDevice* const audioHwDev;
511        audio_stream_out_t* const stream;
512        audio_output_flags_t flags;
513
514        audio_hw_device_t* hwDev() const { return audioHwDev->hwDevice(); }
515
516        AudioStreamOut(AudioHwDevice *dev, audio_stream_out_t *out, audio_output_flags_t flags) :
517            audioHwDev(dev), stream(out), flags(flags) {}
518    };
519
520    struct AudioStreamIn {
521        AudioHwDevice* const audioHwDev;
522        audio_stream_in_t* const stream;
523
524        audio_hw_device_t* hwDev() const { return audioHwDev->hwDevice(); }
525
526        AudioStreamIn(AudioHwDevice *dev, audio_stream_in_t *in) :
527            audioHwDev(dev), stream(in) {}
528    };
529
530    // for mAudioSessionRefs only
531    struct AudioSessionRef {
532        AudioSessionRef(int sessionid, pid_t pid) :
533            mSessionid(sessionid), mPid(pid), mCnt(1) {}
534        const int   mSessionid;
535        const pid_t mPid;
536        int         mCnt;
537    };
538
539    mutable     Mutex                               mLock;
540
541                DefaultKeyedVector< pid_t, wp<Client> >     mClients;   // see ~Client()
542
543                mutable     Mutex                   mHardwareLock;
544                // NOTE: If both mLock and mHardwareLock mutexes must be held,
545                // always take mLock before mHardwareLock
546
547                // These two fields are immutable after onFirstRef(), so no lock needed to access
548                AudioHwDevice*                      mPrimaryHardwareDev; // mAudioHwDevs[0] or NULL
549                DefaultKeyedVector<audio_module_handle_t, AudioHwDevice*>  mAudioHwDevs;
550
551    // for dump, indicates which hardware operation is currently in progress (but not stream ops)
552    enum hardware_call_state {
553        AUDIO_HW_IDLE = 0,              // no operation in progress
554        AUDIO_HW_INIT,                  // init_check
555        AUDIO_HW_OUTPUT_OPEN,           // open_output_stream
556        AUDIO_HW_OUTPUT_CLOSE,          // unused
557        AUDIO_HW_INPUT_OPEN,            // unused
558        AUDIO_HW_INPUT_CLOSE,           // unused
559        AUDIO_HW_STANDBY,               // unused
560        AUDIO_HW_SET_MASTER_VOLUME,     // set_master_volume
561        AUDIO_HW_GET_ROUTING,           // unused
562        AUDIO_HW_SET_ROUTING,           // unused
563        AUDIO_HW_GET_MODE,              // unused
564        AUDIO_HW_SET_MODE,              // set_mode
565        AUDIO_HW_GET_MIC_MUTE,          // get_mic_mute
566        AUDIO_HW_SET_MIC_MUTE,          // set_mic_mute
567        AUDIO_HW_SET_VOICE_VOLUME,      // set_voice_volume
568        AUDIO_HW_SET_PARAMETER,         // set_parameters
569        AUDIO_HW_GET_INPUT_BUFFER_SIZE, // get_input_buffer_size
570        AUDIO_HW_GET_MASTER_VOLUME,     // get_master_volume
571        AUDIO_HW_GET_PARAMETER,         // get_parameters
572        AUDIO_HW_SET_MASTER_MUTE,       // set_master_mute
573        AUDIO_HW_GET_MASTER_MUTE,       // get_master_mute
574    };
575
576    mutable     hardware_call_state                 mHardwareStatus;    // for dump only
577
578
579                DefaultKeyedVector< audio_io_handle_t, sp<PlaybackThread> >  mPlaybackThreads;
580                stream_type_t                       mStreamTypes[AUDIO_STREAM_CNT];
581
582                // member variables below are protected by mLock
583                float                               mMasterVolume;
584                bool                                mMasterMute;
585                // end of variables protected by mLock
586
587                DefaultKeyedVector< audio_io_handle_t, sp<RecordThread> >    mRecordThreads;
588
589                DefaultKeyedVector< pid_t, sp<NotificationClient> >    mNotificationClients;
590                volatile int32_t                    mNextUniqueId;  // updated by android_atomic_inc
591                audio_mode_t                        mMode;
592                bool                                mBtNrecIsOff;
593
594                // protected by mLock
595                Vector<AudioSessionRef*> mAudioSessionRefs;
596
597                float       masterVolume_l() const;
598                bool        masterMute_l() const;
599                audio_module_handle_t loadHwModule_l(const char *name);
600
601                Vector < sp<SyncEvent> > mPendingSyncEvents; // sync events awaiting for a session
602                                                             // to be created
603
604private:
605    sp<Client>  registerPid_l(pid_t pid);    // always returns non-0
606
607    // for use from destructor
608    status_t    closeOutput_nonvirtual(audio_io_handle_t output);
609    status_t    closeInput_nonvirtual(audio_io_handle_t input);
610
611#ifdef TEE_SINK
612    // all record threads serially share a common tee sink, which is re-created on format change
613    sp<NBAIO_Sink>   mRecordTeeSink;
614    sp<NBAIO_Source> mRecordTeeSource;
615#endif
616
617public:
618
619#ifdef TEE_SINK
620    // tee sink, if enabled by property, allows dumpsys to write most recent audio to .wav file
621    static void dumpTee(int fd, const sp<NBAIO_Source>& source, audio_io_handle_t id = 0);
622
623    // whether tee sink is enabled by property
624    static bool mTeeSinkInputEnabled;
625    static bool mTeeSinkOutputEnabled;
626    static bool mTeeSinkTrackEnabled;
627
628    // runtime configured size of each tee sink pipe, in frames
629    static size_t mTeeSinkInputFrames;
630    static size_t mTeeSinkOutputFrames;
631    static size_t mTeeSinkTrackFrames;
632
633    // compile-time default size of tee sink pipes, in frames
634    // 0x200000 stereo 16-bit PCM frames = 47.5 seconds at 44.1 kHz, 8 megabytes
635    static const size_t kTeeSinkInputFramesDefault = 0x200000;
636    static const size_t kTeeSinkOutputFramesDefault = 0x200000;
637    static const size_t kTeeSinkTrackFramesDefault = 0x1000;
638#endif
639
640    // This method reads from a variable without mLock, but the variable is updated under mLock.  So
641    // we might read a stale value, or a value that's inconsistent with respect to other variables.
642    // In this case, it's safe because the return value isn't used for making an important decision.
643    // The reason we don't want to take mLock is because it could block the caller for a long time.
644    bool    isLowRamDevice() const { return mIsLowRamDevice; }
645
646private:
647    bool    mIsLowRamDevice;
648    bool    mIsDeviceTypeKnown;
649    nsecs_t mGlobalEffectEnableTime;  // when a global effect was last enabled
650};
651
652#undef INCLUDING_FROM_AUDIOFLINGER_H
653
654// ----------------------------------------------------------------------------
655
656}; // namespace android
657
658#endif // ANDROID_AUDIO_FLINGER_H
659