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** Copyright 2012, The Android Open Source Project
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** See the License for the specific language governing permissions and
** limitations under the License.
#error This header file should only be included from AudioFlinger.h
//--- Audio Effect Management
// EffectModule and EffectChain classes both have their own mutex to protect
// state changes or resource modifications. Always respect the following order
// if multiple mutexes must be acquired to avoid cross deadlock:
// AudioFlinger -> ThreadBase -> EffectChain -> EffectModule
// AudioHandle -> ThreadBase -> EffectChain -> EffectModule
// In addition, methods that lock the AudioPolicyService mutex (getOutputForEffect(),
// startOutput(), getInputForAttr(), releaseInput()...) should never be called with AudioFlinger or
// Threadbase mutex locked to avoid cross deadlock with other clients calling AudioPolicyService
// methods that in turn call AudioFlinger thus locking the same mutexes in the reverse order.
// The EffectModule class is a wrapper object controlling the effect engine implementation
// in the effect library. It prevents concurrent calls to process() and command() functions
// from different client threads. It keeps a list of EffectHandle objects corresponding
// to all client applications using this effect and notifies applications of effect state,
// control or parameter changes. It manages the activation state machine to send appropriate
// reset, enable, disable commands to effect engine and provide volume
// ramping when effects are activated/deactivated.
// When controlling an auxiliary effect, the EffectModule also provides an input buffer used by
// the attached track(s) to accumulate their auxiliary channel.
class EffectModule : public RefBase {
EffectModule(ThreadBase *thread,
const wp<AudioFlinger::EffectChain>& chain,
effect_descriptor_t *desc,
int id,
audio_session_t sessionId,
bool pinned);
virtual ~EffectModule();
enum effect_state {
int id() const { return mId; }
void process();
bool updateState();
status_t command(uint32_t cmdCode,
uint32_t cmdSize,
void *pCmdData,
uint32_t *replySize,
void *pReplyData);
void reset_l();
status_t configure();
status_t init();
effect_state state() const {
return mState;
uint32_t status() {
return mStatus;
audio_session_t sessionId() const {
return mSessionId;
status_t setEnabled(bool enabled);
status_t setEnabled_l(bool enabled);
bool isEnabled() const;
bool isProcessEnabled() const;
bool isOffloadedOrDirect() const;
bool isVolumeControlEnabled() const;
void setInBuffer(const sp<EffectBufferHalInterface>& buffer);
int16_t *inBuffer() const {
return mInBuffer != 0 ? reinterpret_cast<int16_t*>(mInBuffer->ptr()) : NULL;
void setOutBuffer(const sp<EffectBufferHalInterface>& buffer);
int16_t *outBuffer() const {
return mOutBuffer != 0 ? reinterpret_cast<int16_t*>(mOutBuffer->ptr()) : NULL;
void setChain(const wp<EffectChain>& chain) { mChain = chain; }
void setThread(const wp<ThreadBase>& thread)
{ mThread = thread; mThreadType = thread.promote()->type(); }
const wp<ThreadBase>& thread() { return mThread; }
status_t addHandle(EffectHandle *handle);
ssize_t disconnectHandle(EffectHandle *handle, bool unpinIfLast);
ssize_t removeHandle(EffectHandle *handle);
ssize_t removeHandle_l(EffectHandle *handle);
const effect_descriptor_t& desc() const { return mDescriptor; }
wp<EffectChain>& chain() { return mChain; }
status_t setDevice(audio_devices_t device);
status_t setVolume(uint32_t *left, uint32_t *right, bool controller);
status_t setMode(audio_mode_t mode);
status_t setAudioSource(audio_source_t source);
status_t start();
status_t stop();
void setSuspended(bool suspended);
bool suspended() const;
EffectHandle* controlHandle_l();
bool isPinned() const { return mPinned; }
void unPin() { mPinned = false; }
bool purgeHandles();
void lock() { mLock.lock(); }
void unlock() { mLock.unlock(); }
bool isOffloadable() const
{ return (mDescriptor.flags & EFFECT_FLAG_OFFLOAD_SUPPORTED) != 0; }
bool isImplementationSoftware() const
{ return (mDescriptor.flags & EFFECT_FLAG_HW_ACC_MASK) == 0; }
bool isProcessImplemented() const
{ return (mDescriptor.flags & EFFECT_FLAG_NO_PROCESS) == 0; }
bool isVolumeControl() const
{ return (mDescriptor.flags & EFFECT_FLAG_VOLUME_MASK)
status_t setOffloaded(bool offloaded, audio_io_handle_t io);
bool isOffloaded() const;
void addEffectToHal_l();
void release_l();
void dump(int fd, const Vector<String16>& args);
friend class AudioFlinger; // for mHandles
bool mPinned;
// Maximum time allocated to effect engines to complete the turn off sequence
static const uint32_t MAX_DISABLE_TIME_MS = 10000;
status_t start_l();
status_t stop_l();
status_t remove_effect_from_hal_l();
mutable Mutex mLock; // mutex for process, commands and handles list protection
wp<ThreadBase> mThread; // parent thread
ThreadBase::type_t mThreadType; // parent thread type
wp<EffectChain> mChain; // parent effect chain
const int mId; // this instance unique ID
const audio_session_t mSessionId; // audio session ID
const effect_descriptor_t mDescriptor;// effect descriptor received from effect engine
effect_config_t mConfig; // input and output audio configuration
sp<EffectHalInterface> mEffectInterface; // Effect module HAL
sp<EffectBufferHalInterface> mInBuffer; // Buffers for interacting with HAL
sp<EffectBufferHalInterface> mOutBuffer;
status_t mStatus; // initialization status
effect_state mState; // current activation state
Vector<EffectHandle *> mHandles; // list of client handles
// First handle in mHandles has highest priority and controls the effect module
uint32_t mMaxDisableWaitCnt; // maximum grace period before forcing an effect off after
// sending disable command.
uint32_t mDisableWaitCnt; // current process() calls count during disable period.
bool mSuspended; // effect is suspended: temporarily disabled by framework
bool mOffloaded; // effect is currently offloaded to the audio DSP
wp<AudioFlinger> mAudioFlinger;
bool mSupportsFloat; // effect supports float processing
sp<EffectBufferHalInterface> mInConversionBuffer; // Buffers for HAL conversion if needed.
sp<EffectBufferHalInterface> mOutConversionBuffer;
uint32_t mInChannelCountRequested;
uint32_t mOutChannelCountRequested;
class AutoLockReentrant {
AutoLockReentrant(Mutex& mutex, pid_t allowedTid)
: mMutex(gettid() == allowedTid ? nullptr : &mutex)
if (mMutex != nullptr) mMutex->lock();
~AutoLockReentrant() {
if (mMutex != nullptr) mMutex->unlock();
Mutex * const mMutex;
static constexpr pid_t INVALID_PID = (pid_t)-1;
// this tid is allowed to call setVolume() without acquiring the mutex.
pid_t mSetVolumeReentrantTid = INVALID_PID;
// The EffectHandle class implements the IEffect interface. It provides resources
// to receive parameter updates, keeps track of effect control
// ownership and state and has a pointer to the EffectModule object it is controlling.
// There is one EffectHandle object for each application controlling (or using)
// an effect module.
// The EffectHandle is obtained by calling AudioFlinger::createEffect().
class EffectHandle: public android::BnEffect {
EffectHandle(const sp<EffectModule>& effect,
const sp<AudioFlinger::Client>& client,
const sp<IEffectClient>& effectClient,
int32_t priority);
virtual ~EffectHandle();
virtual status_t initCheck();
// IEffect
virtual status_t enable();
virtual status_t disable();
virtual status_t command(uint32_t cmdCode,
uint32_t cmdSize,
void *pCmdData,
uint32_t *replySize,
void *pReplyData);
virtual void disconnect();
void disconnect(bool unpinIfLast);
virtual sp<IMemory> getCblk() const { return mCblkMemory; }
virtual status_t onTransact(uint32_t code, const Parcel& data,
Parcel* reply, uint32_t flags);
// Give or take control of effect module
// - hasControl: true if control is given, false if removed
// - signal: true client app should be signaled of change, false otherwise
// - enabled: state of the effect when control is passed
void setControl(bool hasControl, bool signal, bool enabled);
void commandExecuted(uint32_t cmdCode,
uint32_t cmdSize,
void *pCmdData,
uint32_t replySize,
void *pReplyData);
void setEnabled(bool enabled);
bool enabled() const { return mEnabled; }
// Getters
wp<EffectModule> effect() const { return mEffect; }
int id() const {
sp<EffectModule> effect = mEffect.promote();
if (effect == 0) {
return 0;
return effect->id();
int priority() const { return mPriority; }
bool hasControl() const { return mHasControl; }
bool disconnected() const { return mDisconnected; }
void dumpToBuffer(char* buffer, size_t size);
friend class AudioFlinger; // for mEffect, mHasControl, mEnabled
Mutex mLock; // protects IEffect method calls
wp<EffectModule> mEffect; // pointer to controlled EffectModule
sp<IEffectClient> mEffectClient; // callback interface for client notifications
/*const*/ sp<Client> mClient; // client for shared memory allocation, see disconnect()
sp<IMemory> mCblkMemory; // shared memory for control block
effect_param_cblk_t* mCblk; // control block for deferred parameter setting via
// shared memory
uint8_t* mBuffer; // pointer to parameter area in shared memory
int mPriority; // client application priority to control the effect
bool mHasControl; // true if this handle is controlling the effect
bool mEnabled; // cached enable state: needed when the effect is
// restored after being suspended
bool mDisconnected; // Set to true by disconnect()
// the EffectChain class represents a group of effects associated to one audio session.
// There can be any number of EffectChain objects per output mixer thread (PlaybackThread).
// The EffectChain with session ID AUDIO_SESSION_OUTPUT_MIX contains global effects applied
// to the output mix.
// Effects in this chain can be insert or auxiliary. Effects in other chains (attached to
// tracks) are insert only. The EffectChain maintains an ordered list of effect module, the
// order corresponding in the effect process order. When attached to a track (session ID !=
// it also provide it's own input buffer used by the track as accumulation buffer.
class EffectChain : public RefBase {
EffectChain(const wp<ThreadBase>& wThread, audio_session_t sessionId);
EffectChain(ThreadBase *thread, audio_session_t sessionId);
virtual ~EffectChain();
// special key used for an entry in mSuspendedEffects keyed vector
// corresponding to a suspend all request.
static const int kKeyForSuspendAll = 0;
// minimum duration during which we force calling effect process when last track on
// a session is stopped or removed to allow effect tail to be rendered
static const int kProcessTailDurationMs = 1000;
void process_l();
void lock() {
void unlock() {
status_t createEffect_l(sp<EffectModule>& effect,
ThreadBase *thread,
effect_descriptor_t *desc,
int id,
audio_session_t sessionId,
bool pinned);
status_t addEffect_l(const sp<EffectModule>& handle);
status_t addEffect_ll(const sp<EffectModule>& handle);
size_t removeEffect_l(const sp<EffectModule>& handle, bool release = false);
audio_session_t sessionId() const { return mSessionId; }
void setSessionId(audio_session_t sessionId) { mSessionId = sessionId; }
sp<EffectModule> getEffectFromDesc_l(effect_descriptor_t *descriptor);
sp<EffectModule> getEffectFromId_l(int id);
sp<EffectModule> getEffectFromType_l(const effect_uuid_t *type);
// FIXME use float to improve the dynamic range
bool setVolume_l(uint32_t *left, uint32_t *right, bool force = false);
void resetVolume_l();
void setDevice_l(audio_devices_t device);
void setMode_l(audio_mode_t mode);
void setAudioSource_l(audio_source_t source);
void setInBuffer(const sp<EffectBufferHalInterface>& buffer) {
mInBuffer = buffer;
effect_buffer_t *inBuffer() const {
return mInBuffer != 0 ? reinterpret_cast<effect_buffer_t*>(mInBuffer->ptr()) : NULL;
void setOutBuffer(const sp<EffectBufferHalInterface>& buffer) {
mOutBuffer = buffer;
effect_buffer_t *outBuffer() const {
return mOutBuffer != 0 ? reinterpret_cast<effect_buffer_t*>(mOutBuffer->ptr()) : NULL;
void incTrackCnt() { android_atomic_inc(&mTrackCnt); }
void decTrackCnt() { android_atomic_dec(&mTrackCnt); }
int32_t trackCnt() const { return android_atomic_acquire_load(&mTrackCnt); }
void incActiveTrackCnt() { android_atomic_inc(&mActiveTrackCnt);
mTailBufferCount = mMaxTailBuffers; }
void decActiveTrackCnt() { android_atomic_dec(&mActiveTrackCnt); }
int32_t activeTrackCnt() const { return android_atomic_acquire_load(&mActiveTrackCnt); }
uint32_t strategy() const { return mStrategy; }
void setStrategy(uint32_t strategy)
{ mStrategy = strategy; }
// suspend or restore effects of the specified type. The number of suspend requests is counted
// and restore occurs once all suspend requests are cancelled.
void setEffectSuspended_l(const effect_uuid_t *type,
bool suspend);
// suspend all eligible effects
void setEffectSuspendedAll_l(bool suspend);
// check if effects should be suspend or restored when a given effect is enable or disabled
void checkSuspendOnEffectEnabled(const sp<EffectModule>& effect,
bool enabled);
void clearInputBuffer();
// At least one non offloadable effect in the chain is enabled
bool isNonOffloadableEnabled();
bool isNonOffloadableEnabled_l();
void syncHalEffectsState();
// flags is an ORed set of audio_output_flags_t which is updated on return.
void checkOutputFlagCompatibility(audio_output_flags_t *flags) const;
// flags is an ORed set of audio_input_flags_t which is updated on return.
void checkInputFlagCompatibility(audio_input_flags_t *flags) const;
// Is this EffectChain compatible with the RAW audio flag.
bool isRawCompatible() const;
// Is this EffectChain compatible with the FAST audio flag.
bool isFastCompatible() const;
// isCompatibleWithThread_l() must be called with thread->mLock held
bool isCompatibleWithThread_l(const sp<ThreadBase>& thread) const;
void dump(int fd, const Vector<String16>& args);
friend class AudioFlinger; // for mThread, mEffects
class SuspendedEffectDesc : public RefBase {
SuspendedEffectDesc() : mRefCount(0) {}
int mRefCount; // > 0 when suspended
effect_uuid_t mType;
wp<EffectModule> mEffect;
// get a list of effect modules to suspend when an effect of the type
// passed is enabled.
void getSuspendEligibleEffects(Vector< sp<EffectModule> > &effects);
// get an effect module if it is currently enable
sp<EffectModule> getEffectIfEnabled(const effect_uuid_t *type);
// true if the effect whose descriptor is passed can be suspended
// OEMs can modify the rules implemented in this method to exclude specific effect
// types or implementations from the suspend/restore mechanism.
bool isEffectEligibleForSuspend(const effect_descriptor_t& desc);
static bool isEffectEligibleForBtNrecSuspend(const effect_uuid_t *type);
void clearInputBuffer_l(const sp<ThreadBase>& thread);
void setThread(const sp<ThreadBase>& thread);
void setVolumeForOutput_l(uint32_t left, uint32_t right);
wp<ThreadBase> mThread; // parent mixer thread
mutable Mutex mLock; // mutex protecting effect list
Vector< sp<EffectModule> > mEffects; // list of effect modules
audio_session_t mSessionId; // audio session ID
sp<EffectBufferHalInterface> mInBuffer; // chain input buffer
sp<EffectBufferHalInterface> mOutBuffer; // chain output buffer
// 'volatile' here means these are accessed with atomic operations instead of mutex
volatile int32_t mActiveTrackCnt; // number of active tracks connected
volatile int32_t mTrackCnt; // number of tracks connected
int32_t mTailBufferCount; // current effect tail buffer count
int32_t mMaxTailBuffers; // maximum effect tail buffers
int mVolumeCtrlIdx; // index of insert effect having control over volume
uint32_t mLeftVolume; // previous volume on left channel
uint32_t mRightVolume; // previous volume on right channel
uint32_t mNewLeftVolume; // new volume on left channel
uint32_t mNewRightVolume; // new volume on right channel
uint32_t mStrategy; // strategy for this effect chain
// mSuspendedEffects lists all effects currently suspended in the chain.
// Use effect type UUID timelow field as key. There is no real risk of identical
// timeLow fields among effect type UUIDs.
// Updated by setEffectSuspended_l() and setEffectSuspendedAll_l() only.
KeyedVector< int, sp<SuspendedEffectDesc> > mSuspendedEffects;