xref: /frameworks/av/services/audioflinger/Effects.cpp

/*
**
** 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
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/


#define LOG_TAG "AudioFlinger"
//#define LOG_NDEBUG 0

#include "Configuration.h"
#include <utils/Log.h>
#include <audio_effects/effect_visualizer.h>
#include <audio_utils/primitives.h>
#include <private/media/AudioEffectShared.h>
#include <media/EffectsFactoryApi.h>

#include "AudioFlinger.h"
#include "ServiceUtilities.h"

// ----------------------------------------------------------------------------

// Note: the following macro is used for extremely verbose logging message.  In
// order to run with ALOG_ASSERT turned on, we need to have LOG_NDEBUG set to
// 0; but one side effect of this is to turn all LOGV's as well.  Some messages
// are so verbose that we want to suppress them even when we have ALOG_ASSERT
// turned on.  Do not uncomment the #def below unless you really know what you
// are doing and want to see all of the extremely verbose messages.
//#define VERY_VERY_VERBOSE_LOGGING
#ifdef VERY_VERY_VERBOSE_LOGGING
#define ALOGVV ALOGV
#else
#define ALOGVV(a...) do { } while(0)
#endif

namespace android {

// ----------------------------------------------------------------------------
//  EffectModule implementation
// ----------------------------------------------------------------------------

#undef LOG_TAG
#define LOG_TAG "AudioFlinger::EffectModule"

AudioFlinger::EffectModule::EffectModule(ThreadBase *thread,
                                        const wp<AudioFlinger::EffectChain>& chain,
                                        effect_descriptor_t *desc,
                                        int id,
                                        int sessionId)
    : mPinned(sessionId > AUDIO_SESSION_OUTPUT_MIX),
      mThread(thread), mChain(chain), mId(id), mSessionId(sessionId),
      mDescriptor(*desc),
      // mConfig is set by configure() and not used before then
      mEffectInterface(NULL),
      mStatus(NO_INIT), mState(IDLE),
      // mMaxDisableWaitCnt is set by configure() and not used before then
      // mDisableWaitCnt is set by process() and updateState() and not used before then
      mSuspended(false)
{
    ALOGV("Constructor %p", this);
    int lStatus;

    // create effect engine from effect factory
    mStatus = EffectCreate(&desc->uuid, sessionId, thread->id(), &mEffectInterface);

    if (mStatus != NO_ERROR) {
        return;
    }
    lStatus = init();
    if (lStatus < 0) {
        mStatus = lStatus;
        goto Error;
    }

    ALOGV("Constructor success name %s, Interface %p", mDescriptor.name, mEffectInterface);
    return;
Error:
    EffectRelease(mEffectInterface);
    mEffectInterface = NULL;
    ALOGV("Constructor Error %d", mStatus);
}

AudioFlinger::EffectModule::~EffectModule()
{
    ALOGV("Destructor %p", this);
    if (mEffectInterface != NULL) {
        remove_effect_from_hal_l();
        // release effect engine
        EffectRelease(mEffectInterface);
    }
}

status_t AudioFlinger::EffectModule::addHandle(EffectHandle *handle)
{
    status_t status;

    Mutex::Autolock _l(mLock);
    int priority = handle->priority();
    size_t size = mHandles.size();
    EffectHandle *controlHandle = NULL;
    size_t i;
    for (i = 0; i < size; i++) {
        EffectHandle *h = mHandles[i];
        if (h == NULL || h->destroyed_l()) {
            continue;
        }
        // first non destroyed handle is considered in control
        if (controlHandle == NULL)
            controlHandle = h;
        if (h->priority() <= priority) {
            break;
        }
    }
    // if inserted in first place, move effect control from previous owner to this handle
    if (i == 0) {
        bool enabled = false;
        if (controlHandle != NULL) {
            enabled = controlHandle->enabled();
            controlHandle->setControl(false/*hasControl*/, true /*signal*/, enabled /*enabled*/);
        }
        handle->setControl(true /*hasControl*/, false /*signal*/, enabled /*enabled*/);
        status = NO_ERROR;
    } else {
        status = ALREADY_EXISTS;
    }
    ALOGV("addHandle() %p added handle %p in position %d", this, handle, i);
    mHandles.insertAt(handle, i);
    return status;
}

size_t AudioFlinger::EffectModule::removeHandle(EffectHandle *handle)
{
    Mutex::Autolock _l(mLock);
    size_t size = mHandles.size();
    size_t i;
    for (i = 0; i < size; i++) {
        if (mHandles[i] == handle) {
            break;
        }
    }
    if (i == size) {
        return size;
    }
    ALOGV("removeHandle() %p removed handle %p in position %d", this, handle, i);

    mHandles.removeAt(i);
    // if removed from first place, move effect control from this handle to next in line
    if (i == 0) {
        EffectHandle *h = controlHandle_l();
        if (h != NULL) {
            h->setControl(true /*hasControl*/, true /*signal*/ , handle->enabled() /*enabled*/);
        }
    }

    // Prevent calls to process() and other functions on effect interface from now on.
    // The effect engine will be released by the destructor when the last strong reference on
    // this object is released which can happen after next process is called.
    if (mHandles.size() == 0 && !mPinned) {
        mState = DESTROYED;
    }

    return mHandles.size();
}

// must be called with EffectModule::mLock held
AudioFlinger::EffectHandle *AudioFlinger::EffectModule::controlHandle_l()
{
    // the first valid handle in the list has control over the module
    for (size_t i = 0; i < mHandles.size(); i++) {
        EffectHandle *h = mHandles[i];
        if (h != NULL && !h->destroyed_l()) {
            return h;
        }
    }

    return NULL;
}

size_t AudioFlinger::EffectModule::disconnect(EffectHandle *handle, bool unpinIfLast)
{
    ALOGV("disconnect() %p handle %p", this, handle);
    // keep a strong reference on this EffectModule to avoid calling the
    // destructor before we exit
    sp<EffectModule> keep(this);
    {
        sp<ThreadBase> thread = mThread.promote();
        if (thread != 0) {
            thread->disconnectEffect(keep, handle, unpinIfLast);
        }
    }
    return mHandles.size();
}

void AudioFlinger::EffectModule::updateState() {
    Mutex::Autolock _l(mLock);

    switch (mState) {
    case RESTART:
        reset_l();
        // FALL THROUGH

    case STARTING:
        // clear auxiliary effect input buffer for next accumulation
        if ((mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_AUXILIARY) {
            memset(mConfig.inputCfg.buffer.raw,
                   0,
                   mConfig.inputCfg.buffer.frameCount*sizeof(int32_t));
        }
        if (start_l() == NO_ERROR) {
            mState = ACTIVE;
        } else {
            mState = IDLE;
        }
        break;
    case STOPPING:
        if (stop_l() == NO_ERROR) {
            mDisableWaitCnt = mMaxDisableWaitCnt;
        } else {
            mDisableWaitCnt = 1; // will cause immediate transition to IDLE
        }
        mState = STOPPED;
        break;
    case STOPPED:
        // mDisableWaitCnt is forced to 1 by process() when the engine indicates the end of the
        // turn off sequence.
        if (--mDisableWaitCnt == 0) {
            reset_l();
            mState = IDLE;
        }
        break;
    default: //IDLE , ACTIVE, DESTROYED
        break;
    }
}

void AudioFlinger::EffectModule::process()
{
    Mutex::Autolock _l(mLock);

    if (mState == DESTROYED || mEffectInterface == NULL ||
            mConfig.inputCfg.buffer.raw == NULL ||
            mConfig.outputCfg.buffer.raw == NULL) {
        return;
    }

    if (isProcessEnabled()) {
        // do 32 bit to 16 bit conversion for auxiliary effect input buffer
        if ((mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_AUXILIARY) {
            ditherAndClamp(mConfig.inputCfg.buffer.s32,
                                        mConfig.inputCfg.buffer.s32,
                                        mConfig.inputCfg.buffer.frameCount/2);
        }

        // do the actual processing in the effect engine
        int ret = (*mEffectInterface)->process(mEffectInterface,
                                               &mConfig.inputCfg.buffer,
                                               &mConfig.outputCfg.buffer);

        // force transition to IDLE state when engine is ready
        if (mState == STOPPED && ret == -ENODATA) {
            mDisableWaitCnt = 1;
        }

        // clear auxiliary effect input buffer for next accumulation
        if ((mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_AUXILIARY) {
            memset(mConfig.inputCfg.buffer.raw, 0,
                   mConfig.inputCfg.buffer.frameCount*sizeof(int32_t));
        }
    } else if ((mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_INSERT &&
                mConfig.inputCfg.buffer.raw != mConfig.outputCfg.buffer.raw) {
        // If an insert effect is idle and input buffer is different from output buffer,
        // accumulate input onto output
        sp<EffectChain> chain = mChain.promote();
        if (chain != 0 && chain->activeTrackCnt() != 0) {
            size_t frameCnt = mConfig.inputCfg.buffer.frameCount * 2;  //always stereo here
            int16_t *in = mConfig.inputCfg.buffer.s16;
            int16_t *out = mConfig.outputCfg.buffer.s16;
            for (size_t i = 0; i < frameCnt; i++) {
                out[i] = clamp16((int32_t)out[i] + (int32_t)in[i]);
            }
        }
    }
}

void AudioFlinger::EffectModule::reset_l()
{
    if (mStatus != NO_ERROR || mEffectInterface == NULL) {
        return;
    }
    (*mEffectInterface)->command(mEffectInterface, EFFECT_CMD_RESET, 0, NULL, 0, NULL);
}

status_t AudioFlinger::EffectModule::configure()
{
    status_t status;
    sp<ThreadBase> thread;
    uint32_t size;
    audio_channel_mask_t channelMask;

    if (mEffectInterface == NULL) {
        status = NO_INIT;
        goto exit;
    }

    thread = mThread.promote();
    if (thread == 0) {
        status = DEAD_OBJECT;
        goto exit;
    }

    // TODO: handle configuration of effects replacing track process
    channelMask = thread->channelMask();

    if ((mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_AUXILIARY) {
        mConfig.inputCfg.channels = AUDIO_CHANNEL_OUT_MONO;
    } else {
        mConfig.inputCfg.channels = channelMask;
    }
    mConfig.outputCfg.channels = channelMask;
    mConfig.inputCfg.format = AUDIO_FORMAT_PCM_16_BIT;
    mConfig.outputCfg.format = AUDIO_FORMAT_PCM_16_BIT;
    mConfig.inputCfg.samplingRate = thread->sampleRate();
    mConfig.outputCfg.samplingRate = mConfig.inputCfg.samplingRate;
    mConfig.inputCfg.bufferProvider.cookie = NULL;
    mConfig.inputCfg.bufferProvider.getBuffer = NULL;
    mConfig.inputCfg.bufferProvider.releaseBuffer = NULL;
    mConfig.outputCfg.bufferProvider.cookie = NULL;
    mConfig.outputCfg.bufferProvider.getBuffer = NULL;
    mConfig.outputCfg.bufferProvider.releaseBuffer = NULL;
    mConfig.inputCfg.accessMode = EFFECT_BUFFER_ACCESS_READ;
    // Insert effect:
    // - in session AUDIO_SESSION_OUTPUT_MIX or AUDIO_SESSION_OUTPUT_STAGE,
    // always overwrites output buffer: input buffer == output buffer
    // - in other sessions:
    //      last effect in the chain accumulates in output buffer: input buffer != output buffer
    //      other effect: overwrites output buffer: input buffer == output buffer
    // Auxiliary effect:
    //      accumulates in output buffer: input buffer != output buffer
    // Therefore: accumulate <=> input buffer != output buffer
    if (mConfig.inputCfg.buffer.raw != mConfig.outputCfg.buffer.raw) {
        mConfig.outputCfg.accessMode = EFFECT_BUFFER_ACCESS_ACCUMULATE;
    } else {
        mConfig.outputCfg.accessMode = EFFECT_BUFFER_ACCESS_WRITE;
    }
    mConfig.inputCfg.mask = EFFECT_CONFIG_ALL;
    mConfig.outputCfg.mask = EFFECT_CONFIG_ALL;
    mConfig.inputCfg.buffer.frameCount = thread->frameCount();
    mConfig.outputCfg.buffer.frameCount = mConfig.inputCfg.buffer.frameCount;

    ALOGV("configure() %p thread %p buffer %p framecount %d",
            this, thread.get(), mConfig.inputCfg.buffer.raw, mConfig.inputCfg.buffer.frameCount);

    status_t cmdStatus;
    size = sizeof(int);
    status = (*mEffectInterface)->command(mEffectInterface,
                                                   EFFECT_CMD_SET_CONFIG,
                                                   sizeof(effect_config_t),
                                                   &mConfig,
                                                   &size,
                                                   &cmdStatus);
    if (status == 0) {
        status = cmdStatus;
    }

    if (status == 0 &&
            (memcmp(&mDescriptor.type, SL_IID_VISUALIZATION, sizeof(effect_uuid_t)) == 0)) {
        uint32_t buf32[sizeof(effect_param_t) / sizeof(uint32_t) + 2];
        effect_param_t *p = (effect_param_t *)buf32;

        p->psize = sizeof(uint32_t);
        p->vsize = sizeof(uint32_t);
        size = sizeof(int);
        *(int32_t *)p->data = VISUALIZER_PARAM_LATENCY;

        uint32_t latency = 0;
        PlaybackThread *pbt = thread->mAudioFlinger->checkPlaybackThread_l(thread->mId);
        if (pbt != NULL) {
            latency = pbt->latency_l();
        }

        *((int32_t *)p->data + 1)= latency;
        (*mEffectInterface)->command(mEffectInterface,
                                     EFFECT_CMD_SET_PARAM,
                                     sizeof(effect_param_t) + 8,
                                     &buf32,
                                     &size,
                                     &cmdStatus);
    }

    mMaxDisableWaitCnt = (MAX_DISABLE_TIME_MS * mConfig.outputCfg.samplingRate) /
            (1000 * mConfig.outputCfg.buffer.frameCount);

exit:
    mStatus = status;
    return status;
}

status_t AudioFlinger::EffectModule::init()
{
    Mutex::Autolock _l(mLock);
    if (mEffectInterface == NULL) {
        return NO_INIT;
    }
    status_t cmdStatus;
    uint32_t size = sizeof(status_t);
    status_t status = (*mEffectInterface)->command(mEffectInterface,
                                                   EFFECT_CMD_INIT,
                                                   0,
                                                   NULL,
                                                   &size,
                                                   &cmdStatus);
    if (status == 0) {
        status = cmdStatus;
    }
    return status;
}

status_t AudioFlinger::EffectModule::start()
{
    Mutex::Autolock _l(mLock);
    return start_l();
}

status_t AudioFlinger::EffectModule::start_l()
{
    if (mEffectInterface == NULL) {
        return NO_INIT;
    }
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t cmdStatus;
    uint32_t size = sizeof(status_t);
    status_t status = (*mEffectInterface)->command(mEffectInterface,
                                                   EFFECT_CMD_ENABLE,
                                                   0,
                                                   NULL,
                                                   &size,
                                                   &cmdStatus);
    if (status == 0) {
        status = cmdStatus;
    }
    if (status == 0 &&
            ((mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_PRE_PROC ||
             (mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_POST_PROC)) {
        sp<ThreadBase> thread = mThread.promote();
        if (thread != 0) {
            audio_stream_t *stream = thread->stream();
            if (stream != NULL) {
                stream->add_audio_effect(stream, mEffectInterface);
            }
        }
    }
    return status;
}

status_t AudioFlinger::EffectModule::stop()
{
    Mutex::Autolock _l(mLock);
    return stop_l();
}

status_t AudioFlinger::EffectModule::stop_l()
{
    if (mEffectInterface == NULL) {
        return NO_INIT;
    }
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t cmdStatus = NO_ERROR;
    uint32_t size = sizeof(status_t);
    status_t status = (*mEffectInterface)->command(mEffectInterface,
                                                   EFFECT_CMD_DISABLE,
                                                   0,
                                                   NULL,
                                                   &size,
                                                   &cmdStatus);
    if (status == NO_ERROR) {
        status = cmdStatus;
    }
    if (status == NO_ERROR) {
        status = remove_effect_from_hal_l();
    }
    return status;
}

status_t AudioFlinger::EffectModule::remove_effect_from_hal_l()
{
    if ((mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_PRE_PROC ||
             (mDescriptor.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_POST_PROC) {
        sp<ThreadBase> thread = mThread.promote();
        if (thread != 0) {
            audio_stream_t *stream = thread->stream();
            if (stream != NULL) {
                stream->remove_audio_effect(stream, mEffectInterface);
            }
        }
    }
    return NO_ERROR;
}

status_t AudioFlinger::EffectModule::command(uint32_t cmdCode,
                                             uint32_t cmdSize,
                                             void *pCmdData,
                                             uint32_t *replySize,
                                             void *pReplyData)
{
    Mutex::Autolock _l(mLock);
    ALOGVV("command(), cmdCode: %d, mEffectInterface: %p", cmdCode, mEffectInterface);

    if (mState == DESTROYED || mEffectInterface == NULL) {
        return NO_INIT;
    }
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t status = (*mEffectInterface)->command(mEffectInterface,
                                                   cmdCode,
                                                   cmdSize,
                                                   pCmdData,
                                                   replySize,
                                                   pReplyData);
    if (cmdCode != EFFECT_CMD_GET_PARAM && status == NO_ERROR) {
        uint32_t size = (replySize == NULL) ? 0 : *replySize;
        for (size_t i = 1; i < mHandles.size(); i++) {
            EffectHandle *h = mHandles[i];
            if (h != NULL && !h->destroyed_l()) {
                h->commandExecuted(cmdCode, cmdSize, pCmdData, size, pReplyData);
            }
        }
    }
    return status;
}

status_t AudioFlinger::EffectModule::setEnabled(bool enabled)
{
    Mutex::Autolock _l(mLock);
    return setEnabled_l(enabled);
}

// must be called with EffectModule::mLock held
status_t AudioFlinger::EffectModule::setEnabled_l(bool enabled)
{

    ALOGV("setEnabled %p enabled %d", this, enabled);

    if (enabled != isEnabled()) {
        status_t status = AudioSystem::setEffectEnabled(mId, enabled);
        if (enabled && status != NO_ERROR) {
            return status;
        }

        switch (mState) {
        // going from disabled to enabled
        case IDLE:
            mState = STARTING;
            break;
        case STOPPED:
            mState = RESTART;
            break;
        case STOPPING:
            mState = ACTIVE;
            break;

        // going from enabled to disabled
        case RESTART:
            mState = STOPPED;
            break;
        case STARTING:
            mState = IDLE;
            break;
        case ACTIVE:
            mState = STOPPING;
            break;
        case DESTROYED:
            return NO_ERROR; // simply ignore as we are being destroyed
        }
        for (size_t i = 1; i < mHandles.size(); i++) {
            EffectHandle *h = mHandles[i];
            if (h != NULL && !h->destroyed_l()) {
                h->setEnabled(enabled);
            }
        }
    }
    return NO_ERROR;
}

bool AudioFlinger::EffectModule::isEnabled() const
{
    switch (mState) {
    case RESTART:
    case STARTING:
    case ACTIVE:
        return true;
    case IDLE:
    case STOPPING:
    case STOPPED:
    case DESTROYED:
    default:
        return false;
    }
}

bool AudioFlinger::EffectModule::isProcessEnabled() const
{
    if (mStatus != NO_ERROR) {
        return false;
    }

    switch (mState) {
    case RESTART:
    case ACTIVE:
    case STOPPING:
    case STOPPED:
        return true;
    case IDLE:
    case STARTING:
    case DESTROYED:
    default:
        return false;
    }
}

status_t AudioFlinger::EffectModule::setVolume(uint32_t *left, uint32_t *right, bool controller)
{
    Mutex::Autolock _l(mLock);
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t status = NO_ERROR;
    // Send volume indication if EFFECT_FLAG_VOLUME_IND is set and read back altered volume
    // if controller flag is set (Note that controller == TRUE => EFFECT_FLAG_VOLUME_CTRL set)
    if (isProcessEnabled() &&
            ((mDescriptor.flags & EFFECT_FLAG_VOLUME_MASK) == EFFECT_FLAG_VOLUME_CTRL ||
            (mDescriptor.flags & EFFECT_FLAG_VOLUME_MASK) == EFFECT_FLAG_VOLUME_IND)) {
        status_t cmdStatus;
        uint32_t volume[2];
        uint32_t *pVolume = NULL;
        uint32_t size = sizeof(volume);
        volume[0] = *left;
        volume[1] = *right;
        if (controller) {
            pVolume = volume;
        }
        status = (*mEffectInterface)->command(mEffectInterface,
                                              EFFECT_CMD_SET_VOLUME,
                                              size,
                                              volume,
                                              &size,
                                              pVolume);
        if (controller && status == NO_ERROR && size == sizeof(volume)) {
            *left = volume[0];
            *right = volume[1];
        }
    }
    return status;
}

status_t AudioFlinger::EffectModule::setDevice(audio_devices_t device)
{
    if (device == AUDIO_DEVICE_NONE) {
        return NO_ERROR;
    }

    Mutex::Autolock _l(mLock);
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t status = NO_ERROR;
    if ((mDescriptor.flags & EFFECT_FLAG_DEVICE_MASK) == EFFECT_FLAG_DEVICE_IND) {
        status_t cmdStatus;
        uint32_t size = sizeof(status_t);
        uint32_t cmd = audio_is_output_devices(device) ? EFFECT_CMD_SET_DEVICE :
                            EFFECT_CMD_SET_INPUT_DEVICE;
        status = (*mEffectInterface)->command(mEffectInterface,
                                              cmd,
                                              sizeof(uint32_t),
                                              &device,
                                              &size,
                                              &cmdStatus);
    }
    return status;
}

status_t AudioFlinger::EffectModule::setMode(audio_mode_t mode)
{
    Mutex::Autolock _l(mLock);
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t status = NO_ERROR;
    if ((mDescriptor.flags & EFFECT_FLAG_AUDIO_MODE_MASK) == EFFECT_FLAG_AUDIO_MODE_IND) {
        status_t cmdStatus;
        uint32_t size = sizeof(status_t);
        status = (*mEffectInterface)->command(mEffectInterface,
                                              EFFECT_CMD_SET_AUDIO_MODE,
                                              sizeof(audio_mode_t),
                                              &mode,
                                              &size,
                                              &cmdStatus);
        if (status == NO_ERROR) {
            status = cmdStatus;
        }
    }
    return status;
}

status_t AudioFlinger::EffectModule::setAudioSource(audio_source_t source)
{
    Mutex::Autolock _l(mLock);
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t status = NO_ERROR;
    if ((mDescriptor.flags & EFFECT_FLAG_AUDIO_SOURCE_MASK) == EFFECT_FLAG_AUDIO_SOURCE_IND) {
        uint32_t size = 0;
        status = (*mEffectInterface)->command(mEffectInterface,
                                              EFFECT_CMD_SET_AUDIO_SOURCE,
                                              sizeof(audio_source_t),
                                              &source,
                                              &size,
                                              NULL);
    }
    return status;
}

void AudioFlinger::EffectModule::setSuspended(bool suspended)
{
    Mutex::Autolock _l(mLock);
    mSuspended = suspended;
}

bool AudioFlinger::EffectModule::suspended() const
{
    Mutex::Autolock _l(mLock);
    return mSuspended;
}

bool AudioFlinger::EffectModule::purgeHandles()
{
    bool enabled = false;
    Mutex::Autolock _l(mLock);
    for (size_t i = 0; i < mHandles.size(); i++) {
        EffectHandle *handle = mHandles[i];
        if (handle != NULL && !handle->destroyed_l()) {
            handle->effect().clear();
            if (handle->hasControl()) {
                enabled = handle->enabled();
            }
        }
    }
    return enabled;
}

status_t AudioFlinger::EffectModule::setOffloaded(bool offloaded, audio_io_handle_t io)
{
    Mutex::Autolock _l(mLock);
    if (mStatus != NO_ERROR) {
        return mStatus;
    }
    status_t status = NO_ERROR;
    if ((mDescriptor.flags & EFFECT_FLAG_OFFLOAD_SUPPORTED) != 0) {
        status_t cmdStatus;
        uint32_t size = sizeof(status_t);
        effect_offload_param_t cmd;

        cmd.isOffload = offloaded;
        cmd.ioHandle = io;
        status = (*mEffectInterface)->command(mEffectInterface,
                                              EFFECT_CMD_OFFLOAD,
                                              sizeof(effect_offload_param_t),
                                              &cmd,
                                              &size,
                                              &cmdStatus);
        if (status == NO_ERROR) {
            status = cmdStatus;
        }
        mOffloaded = (status == NO_ERROR) ? offloaded : false;
    } else {
        if (offloaded) {
            status = INVALID_OPERATION;
        }
        mOffloaded = false;
    }
    ALOGV("setOffloaded() offloaded %d io %d status %d", offloaded, io, status);
    return status;
}

bool AudioFlinger::EffectModule::isOffloaded() const
{
    Mutex::Autolock _l(mLock);
    return mOffloaded;
}

void AudioFlinger::EffectModule::dump(int fd, const Vector<String16>& args)
{
    const size_t SIZE = 256;
    char buffer[SIZE];
    String8 result;

    snprintf(buffer, SIZE, "\tEffect ID %d:\n", mId);
    result.append(buffer);

    bool locked = AudioFlinger::dumpTryLock(mLock);
    // failed to lock - AudioFlinger is probably deadlocked
    if (!locked) {
        result.append("\t\tCould not lock Fx mutex:\n");
    }

    result.append("\t\tSession Status State Engine:\n");
    snprintf(buffer, SIZE, "\t\t%05d   %03d    %03d   0x%08x\n",
            mSessionId, mStatus, mState, (uint32_t)mEffectInterface);
    result.append(buffer);

    result.append("\t\tDescriptor:\n");
    snprintf(buffer, SIZE, "\t\t- UUID: %08X-%04X-%04X-%04X-%02X%02X%02X%02X%02X%02X\n",
            mDescriptor.uuid.timeLow, mDescriptor.uuid.timeMid, mDescriptor.uuid.timeHiAndVersion,
            mDescriptor.uuid.clockSeq, mDescriptor.uuid.node[0], mDescriptor.uuid.node[1],
                    mDescriptor.uuid.node[2],
            mDescriptor.uuid.node[3],mDescriptor.uuid.node[4],mDescriptor.uuid.node[5]);
    result.append(buffer);
    snprintf(buffer, SIZE, "\t\t- TYPE: %08X-%04X-%04X-%04X-%02X%02X%02X%02X%02X%02X\n",
                mDescriptor.type.timeLow, mDescriptor.type.timeMid,
                    mDescriptor.type.timeHiAndVersion,
                mDescriptor.type.clockSeq, mDescriptor.type.node[0], mDescriptor.type.node[1],
                    mDescriptor.type.node[2],
                mDescriptor.type.node[3],mDescriptor.type.node[4],mDescriptor.type.node[5]);
    result.append(buffer);
    snprintf(buffer, SIZE, "\t\t- apiVersion: %08X\n\t\t- flags: %08X\n",
            mDescriptor.apiVersion,
            mDescriptor.flags);
    result.append(buffer);
    snprintf(buffer, SIZE, "\t\t- name: %s\n",
            mDescriptor.name);
    result.append(buffer);
    snprintf(buffer, SIZE, "\t\t- implementor: %s\n",
            mDescriptor.implementor);
    result.append(buffer);

    result.append("\t\t- Input configuration:\n");
    result.append("\t\t\tBuffer     Frames  Smp rate Channels Format\n");
    snprintf(buffer, SIZE, "\t\t\t0x%08x %05d   %05d    %08x %d\n",
            (uint32_t)mConfig.inputCfg.buffer.raw,
            mConfig.inputCfg.buffer.frameCount,
            mConfig.inputCfg.samplingRate,
            mConfig.inputCfg.channels,
            mConfig.inputCfg.format);
    result.append(buffer);

    result.append("\t\t- Output configuration:\n");
    result.append("\t\t\tBuffer     Frames  Smp rate Channels Format\n");
    snprintf(buffer, SIZE, "\t\t\t0x%08x %05d   %05d    %08x %d\n",
            (uint32_t)mConfig.outputCfg.buffer.raw,
            mConfig.outputCfg.buffer.frameCount,
            mConfig.outputCfg.samplingRate,
            mConfig.outputCfg.channels,
            mConfig.outputCfg.format);
    result.append(buffer);

    snprintf(buffer, SIZE, "\t\t%d Clients:\n", mHandles.size());
    result.append(buffer);
    result.append("\t\t\tPid   Priority Ctrl Locked client server\n");
    for (size_t i = 0; i < mHandles.size(); ++i) {
        EffectHandle *handle = mHandles[i];
        if (handle != NULL && !handle->destroyed_l()) {
            handle->dump(buffer, SIZE);
            result.append(buffer);
        }
    }

    result.append("\n");

    write(fd, result.string(), result.length());

    if (locked) {
        mLock.unlock();
    }
}

// ----------------------------------------------------------------------------
//  EffectHandle implementation
// ----------------------------------------------------------------------------

#undef LOG_TAG
#define LOG_TAG "AudioFlinger::EffectHandle"

AudioFlinger::EffectHandle::EffectHandle(const sp<EffectModule>& effect,
                                        const sp<AudioFlinger::Client>& client,
                                        const sp<IEffectClient>& effectClient,
                                        int32_t priority)
    : BnEffect(),
    mEffect(effect), mEffectClient(effectClient), mClient(client), mCblk(NULL),
    mPriority(priority), mHasControl(false), mEnabled(false), mDestroyed(false)
{
    ALOGV("constructor %p", this);

    if (client == 0) {
        return;
    }
    int bufOffset = ((sizeof(effect_param_cblk_t) - 1) / sizeof(int) + 1) * sizeof(int);
    mCblkMemory = client->heap()->allocate(EFFECT_PARAM_BUFFER_SIZE + bufOffset);
    if (mCblkMemory != 0) {
        mCblk = static_cast<effect_param_cblk_t *>(mCblkMemory->pointer());

        if (mCblk != NULL) {
            new(mCblk) effect_param_cblk_t();
            mBuffer = (uint8_t *)mCblk + bufOffset;
        }
    } else {
        ALOGE("not enough memory for Effect size=%u", EFFECT_PARAM_BUFFER_SIZE +
                sizeof(effect_param_cblk_t));
        return;
    }
}

AudioFlinger::EffectHandle::~EffectHandle()
{
    ALOGV("Destructor %p", this);

    if (mEffect == 0) {
        mDestroyed = true;
        return;
    }
    mEffect->lock();
    mDestroyed = true;
    mEffect->unlock();
    disconnect(false);
}

status_t AudioFlinger::EffectHandle::enable()
{
    ALOGV("enable %p", this);
    if (!mHasControl) {
        return INVALID_OPERATION;
    }
    if (mEffect == 0) {
        return DEAD_OBJECT;
    }

    if (mEnabled) {
        return NO_ERROR;
    }

    mEnabled = true;

    sp<ThreadBase> thread = mEffect->thread().promote();
    if (thread != 0) {
        thread->checkSuspendOnEffectEnabled(mEffect, true, mEffect->sessionId());
    }

    // checkSuspendOnEffectEnabled() can suspend this same effect when enabled
    if (mEffect->suspended()) {
        return NO_ERROR;
    }

    status_t status = mEffect->setEnabled(true);
    if (status != NO_ERROR) {
        if (thread != 0) {
            thread->checkSuspendOnEffectEnabled(mEffect, false, mEffect->sessionId());
        }
        mEnabled = false;
    } else {
        if (thread != 0 && !mEffect->isOffloadable()) {
            if ((thread->type() == ThreadBase::OFFLOAD)) {
                PlaybackThread *t = (PlaybackThread *)thread.get();
                t->invalidateTracks(AUDIO_STREAM_MUSIC);
            }
            if (mEffect->sessionId() == AUDIO_SESSION_OUTPUT_MIX) {
                thread->mAudioFlinger->onNonOffloadableGlobalEffectEnable();
            }
        }
    }
    return status;
}

status_t AudioFlinger::EffectHandle::disable()
{
    ALOGV("disable %p", this);
    if (!mHasControl) {
        return INVALID_OPERATION;
    }
    if (mEffect == 0) {
        return DEAD_OBJECT;
    }

    if (!mEnabled) {
        return NO_ERROR;
    }
    mEnabled = false;

    if (mEffect->suspended()) {
        return NO_ERROR;
    }

    status_t status = mEffect->setEnabled(false);

    sp<ThreadBase> thread = mEffect->thread().promote();
    if (thread != 0) {
        thread->checkSuspendOnEffectEnabled(mEffect, false, mEffect->sessionId());
    }

    return status;
}

void AudioFlinger::EffectHandle::disconnect()
{
    disconnect(true);
}

void AudioFlinger::EffectHandle::disconnect(bool unpinIfLast)
{
    ALOGV("disconnect(%s)", unpinIfLast ? "true" : "false");
    if (mEffect == 0) {
        return;
    }
    // restore suspended effects if the disconnected handle was enabled and the last one.
    if ((mEffect->disconnect(this, unpinIfLast) == 0) && mEnabled) {
        sp<ThreadBase> thread = mEffect->thread().promote();
        if (thread != 0) {
            thread->checkSuspendOnEffectEnabled(mEffect, false, mEffect->sessionId());
        }
    }

    // release sp on module => module destructor can be called now
    mEffect.clear();
    if (mClient != 0) {
        if (mCblk != NULL) {
            // unlike ~TrackBase(), mCblk is never a local new, so don't delete
            mCblk->~effect_param_cblk_t();   // destroy our shared-structure.
        }
        mCblkMemory.clear();    // free the shared memory before releasing the heap it belongs to
        // Client destructor must run with AudioFlinger mutex locked
        Mutex::Autolock _l(mClient->audioFlinger()->mLock);
        mClient.clear();
    }
}

status_t AudioFlinger::EffectHandle::command(uint32_t cmdCode,
                                             uint32_t cmdSize,
                                             void *pCmdData,
                                             uint32_t *replySize,
                                             void *pReplyData)
{
    ALOGVV("command(), cmdCode: %d, mHasControl: %d, mEffect: %p",
            cmdCode, mHasControl, (mEffect == 0) ? 0 : mEffect.get());

    // only get parameter command is permitted for applications not controlling the effect
    if (!mHasControl && cmdCode != EFFECT_CMD_GET_PARAM) {
        return INVALID_OPERATION;
    }
    if (mEffect == 0) {
        return DEAD_OBJECT;
    }
    if (mClient == 0) {
        return INVALID_OPERATION;
    }

    // handle commands that are not forwarded transparently to effect engine
    if (cmdCode == EFFECT_CMD_SET_PARAM_COMMIT) {
        // No need to trylock() here as this function is executed in the binder thread serving a
        // particular client process:  no risk to block the whole media server process or mixer
        // threads if we are stuck here
        Mutex::Autolock _l(mCblk->lock);
        if (mCblk->clientIndex > EFFECT_PARAM_BUFFER_SIZE ||
            mCblk->serverIndex > EFFECT_PARAM_BUFFER_SIZE) {
            mCblk->serverIndex = 0;
            mCblk->clientIndex = 0;
            return BAD_VALUE;
        }
        status_t status = NO_ERROR;
        while (mCblk->serverIndex < mCblk->clientIndex) {
            int reply;
            uint32_t rsize = sizeof(int);
            int *p = (int *)(mBuffer + mCblk->serverIndex);
            int size = *p++;
            if (((uint8_t *)p + size) > mBuffer + mCblk->clientIndex) {
                ALOGW("command(): invalid parameter block size");
                break;
            }
            effect_param_t *param = (effect_param_t *)p;
            if (param->psize == 0 || param->vsize == 0) {
                ALOGW("command(): null parameter or value size");
                mCblk->serverIndex += size;
                continue;
            }
            uint32_t psize = sizeof(effect_param_t) +
                             ((param->psize - 1) / sizeof(int) + 1) * sizeof(int) +
                             param->vsize;
            status_t ret = mEffect->command(EFFECT_CMD_SET_PARAM,
                                            psize,
                                            p,
                                            &rsize,
                                            &reply);
            // stop at first error encountered
            if (ret != NO_ERROR) {
                status = ret;
                *(int *)pReplyData = reply;
                break;
            } else if (reply != NO_ERROR) {
                *(int *)pReplyData = reply;
                break;
            }
            mCblk->serverIndex += size;
        }
        mCblk->serverIndex = 0;
        mCblk->clientIndex = 0;
        return status;
    } else if (cmdCode == EFFECT_CMD_ENABLE) {
        *(int *)pReplyData = NO_ERROR;
        return enable();
    } else if (cmdCode == EFFECT_CMD_DISABLE) {
        *(int *)pReplyData = NO_ERROR;
        return disable();
    }

    return mEffect->command(cmdCode, cmdSize, pCmdData, replySize, pReplyData);
}

void AudioFlinger::EffectHandle::setControl(bool hasControl, bool signal, bool enabled)
{
    ALOGV("setControl %p control %d", this, hasControl);

    mHasControl = hasControl;
    mEnabled = enabled;

    if (signal && mEffectClient != 0) {
        mEffectClient->controlStatusChanged(hasControl);
    }
}

void AudioFlinger::EffectHandle::commandExecuted(uint32_t cmdCode,
                                                 uint32_t cmdSize,
                                                 void *pCmdData,
                                                 uint32_t replySize,
                                                 void *pReplyData)
{
    if (mEffectClient != 0) {
        mEffectClient->commandExecuted(cmdCode, cmdSize, pCmdData, replySize, pReplyData);
    }
}



void AudioFlinger::EffectHandle::setEnabled(bool enabled)
{
    if (mEffectClient != 0) {
        mEffectClient->enableStatusChanged(enabled);
    }
}

status_t AudioFlinger::EffectHandle::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    return BnEffect::onTransact(code, data, reply, flags);
}


void AudioFlinger::EffectHandle::dump(char* buffer, size_t size)
{
    bool locked = mCblk != NULL && AudioFlinger::dumpTryLock(mCblk->lock);

    snprintf(buffer, size, "\t\t\t%05d %05d    %01u    %01u      %05u  %05u\n",
            (mClient == 0) ? getpid_cached : mClient->pid(),
            mPriority,
            mHasControl,
            !locked,
            mCblk ? mCblk->clientIndex : 0,
            mCblk ? mCblk->serverIndex : 0
            );

    if (locked) {
        mCblk->lock.unlock();
    }
}

#undef LOG_TAG
#define LOG_TAG "AudioFlinger::EffectChain"

AudioFlinger::EffectChain::EffectChain(ThreadBase *thread,
                                        int sessionId)
    : mThread(thread), mSessionId(sessionId), mActiveTrackCnt(0), mTrackCnt(0), mTailBufferCount(0),
      mOwnInBuffer(false), mVolumeCtrlIdx(-1), mLeftVolume(UINT_MAX), mRightVolume(UINT_MAX),
      mNewLeftVolume(UINT_MAX), mNewRightVolume(UINT_MAX)
{
    mStrategy = AudioSystem::getStrategyForStream(AUDIO_STREAM_MUSIC);
    if (thread == NULL) {
        return;
    }
    mMaxTailBuffers = ((kProcessTailDurationMs * thread->sampleRate()) / 1000) /
                                    thread->frameCount();
}

AudioFlinger::EffectChain::~EffectChain()
{
    if (mOwnInBuffer) {
        delete mInBuffer;
    }

}

// getEffectFromDesc_l() must be called with ThreadBase::mLock held
sp<AudioFlinger::EffectModule> AudioFlinger::EffectChain::getEffectFromDesc_l(
        effect_descriptor_t *descriptor)
{
    size_t size = mEffects.size();

    for (size_t i = 0; i < size; i++) {
        if (memcmp(&mEffects[i]->desc().uuid, &descriptor->uuid, sizeof(effect_uuid_t)) == 0) {
            return mEffects[i];
        }
    }
    return 0;
}

// getEffectFromId_l() must be called with ThreadBase::mLock held
sp<AudioFlinger::EffectModule> AudioFlinger::EffectChain::getEffectFromId_l(int id)
{
    size_t size = mEffects.size();

    for (size_t i = 0; i < size; i++) {
        // by convention, return first effect if id provided is 0 (0 is never a valid id)
        if (id == 0 || mEffects[i]->id() == id) {
            return mEffects[i];
        }
    }
    return 0;
}

// getEffectFromType_l() must be called with ThreadBase::mLock held
sp<AudioFlinger::EffectModule> AudioFlinger::EffectChain::getEffectFromType_l(
        const effect_uuid_t *type)
{
    size_t size = mEffects.size();

    for (size_t i = 0; i < size; i++) {
        if (memcmp(&mEffects[i]->desc().type, type, sizeof(effect_uuid_t)) == 0) {
            return mEffects[i];
        }
    }
    return 0;
}

void AudioFlinger::EffectChain::clearInputBuffer()
{
    Mutex::Autolock _l(mLock);
    sp<ThreadBase> thread = mThread.promote();
    if (thread == 0) {
        ALOGW("clearInputBuffer(): cannot promote mixer thread");
        return;
    }
    clearInputBuffer_l(thread);
}

// Must be called with EffectChain::mLock locked
void AudioFlinger::EffectChain::clearInputBuffer_l(sp<ThreadBase> thread)
{
    memset(mInBuffer, 0, thread->frameCount() * thread->frameSize());
}

// Must be called with EffectChain::mLock locked
void AudioFlinger::EffectChain::process_l()
{
    sp<ThreadBase> thread = mThread.promote();
    if (thread == 0) {
        ALOGW("process_l(): cannot promote mixer thread");
        return;
    }
    bool isGlobalSession = (mSessionId == AUDIO_SESSION_OUTPUT_MIX) ||
            (mSessionId == AUDIO_SESSION_OUTPUT_STAGE);
    // always process effects unless no more tracks are on the session and the effect tail
    // has been rendered
    bool doProcess = true;
    if (!isGlobalSession) {
        bool tracksOnSession = (trackCnt() != 0);

        if (!tracksOnSession && mTailBufferCount == 0) {
            doProcess = false;
        }

        if (activeTrackCnt() == 0) {
            // if no track is active and the effect tail has not been rendered,
            // the input buffer must be cleared here as the mixer process will not do it
            if (tracksOnSession || mTailBufferCount > 0) {
                clearInputBuffer_l(thread);
                if (mTailBufferCount > 0) {
                    mTailBufferCount--;
                }
            }
        }
    }

    size_t size = mEffects.size();
    if (doProcess) {
        for (size_t i = 0; i < size; i++) {
            mEffects[i]->process();
        }
    }
    for (size_t i = 0; i < size; i++) {
        mEffects[i]->updateState();
    }
}

// addEffect_l() must be called with PlaybackThread::mLock held
status_t AudioFlinger::EffectChain::addEffect_l(const sp<EffectModule>& effect)
{
    effect_descriptor_t desc = effect->desc();
    uint32_t insertPref = desc.flags & EFFECT_FLAG_INSERT_MASK;

    Mutex::Autolock _l(mLock);
    effect->setChain(this);
    sp<ThreadBase> thread = mThread.promote();
    if (thread == 0) {
        return NO_INIT;
    }
    effect->setThread(thread);

    if ((desc.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_AUXILIARY) {
        // Auxiliary effects are inserted at the beginning of mEffects vector as
        // they are processed first and accumulated in chain input buffer
        mEffects.insertAt(effect, 0);

        // the input buffer for auxiliary effect contains mono samples in
        // 32 bit format. This is to avoid saturation in AudoMixer
        // accumulation stage. Saturation is done in EffectModule::process() before
        // calling the process in effect engine
        size_t numSamples = thread->frameCount();
        int32_t *buffer = new int32_t[numSamples];
        memset(buffer, 0, numSamples * sizeof(int32_t));
        effect->setInBuffer((int16_t *)buffer);
        // auxiliary effects output samples to chain input buffer for further processing
        // by insert effects
        effect->setOutBuffer(mInBuffer);
    } else {
        // Insert effects are inserted at the end of mEffects vector as they are processed
        //  after track and auxiliary effects.
        // Insert effect order as a function of indicated preference:
        //  if EFFECT_FLAG_INSERT_EXCLUSIVE, insert in first position or reject if
        //  another effect is present
        //  else if EFFECT_FLAG_INSERT_FIRST, insert in first position or after the
        //  last effect claiming first position
        //  else if EFFECT_FLAG_INSERT_LAST, insert in last position or before the
        //  first effect claiming last position
        //  else if EFFECT_FLAG_INSERT_ANY insert after first or before last
        // Reject insertion if an effect with EFFECT_FLAG_INSERT_EXCLUSIVE is
        // already present

        size_t size = mEffects.size();
        size_t idx_insert = size;
        ssize_t idx_insert_first = -1;
        ssize_t idx_insert_last = -1;

        for (size_t i = 0; i < size; i++) {
            effect_descriptor_t d = mEffects[i]->desc();
            uint32_t iMode = d.flags & EFFECT_FLAG_TYPE_MASK;
            uint32_t iPref = d.flags & EFFECT_FLAG_INSERT_MASK;
            if (iMode == EFFECT_FLAG_TYPE_INSERT) {
                // check invalid effect chaining combinations
                if (insertPref == EFFECT_FLAG_INSERT_EXCLUSIVE ||
                    iPref == EFFECT_FLAG_INSERT_EXCLUSIVE) {
                    ALOGW("addEffect_l() could not insert effect %s: exclusive conflict with %s",
                            desc.name, d.name);
                    return INVALID_OPERATION;
                }
                // remember position of first insert effect and by default
                // select this as insert position for new effect
                if (idx_insert == size) {
                    idx_insert = i;
                }
                // remember position of last insert effect claiming
                // first position
                if (iPref == EFFECT_FLAG_INSERT_FIRST) {
                    idx_insert_first = i;
                }
                // remember position of first insert effect claiming
                // last position
                if (iPref == EFFECT_FLAG_INSERT_LAST &&
                    idx_insert_last == -1) {
                    idx_insert_last = i;
                }
            }
        }

        // modify idx_insert from first position if needed
        if (insertPref == EFFECT_FLAG_INSERT_LAST) {
            if (idx_insert_last != -1) {
                idx_insert = idx_insert_last;
            } else {
                idx_insert = size;
            }
        } else {
            if (idx_insert_first != -1) {
                idx_insert = idx_insert_first + 1;
            }
        }

        // always read samples from chain input buffer
        effect->setInBuffer(mInBuffer);

        // if last effect in the chain, output samples to chain
        // output buffer, otherwise to chain input buffer
        if (idx_insert == size) {
            if (idx_insert != 0) {
                mEffects[idx_insert-1]->setOutBuffer(mInBuffer);
                mEffects[idx_insert-1]->configure();
            }
            effect->setOutBuffer(mOutBuffer);
        } else {
            effect->setOutBuffer(mInBuffer);
        }
        mEffects.insertAt(effect, idx_insert);

        ALOGV("addEffect_l() effect %p, added in chain %p at rank %d", effect.get(), this,
                idx_insert);
    }
    effect->configure();
    return NO_ERROR;
}

// removeEffect_l() must be called with PlaybackThread::mLock held
size_t AudioFlinger::EffectChain::removeEffect_l(const sp<EffectModule>& effect)
{
    Mutex::Autolock _l(mLock);
    size_t size = mEffects.size();
    uint32_t type = effect->desc().flags & EFFECT_FLAG_TYPE_MASK;

    for (size_t i = 0; i < size; i++) {
        if (effect == mEffects[i]) {
            // calling stop here will remove pre-processing effect from the audio HAL.
            // This is safe as we hold the EffectChain mutex which guarantees that we are not in
            // the middle of a read from audio HAL
            if (mEffects[i]->state() == EffectModule::ACTIVE ||
                    mEffects[i]->state() == EffectModule::STOPPING) {
                mEffects[i]->stop();
            }
            if (type == EFFECT_FLAG_TYPE_AUXILIARY) {
                delete[] effect->inBuffer();
            } else {
                if (i == size - 1 && i != 0) {
                    mEffects[i - 1]->setOutBuffer(mOutBuffer);
                    mEffects[i - 1]->configure();
                }
            }
            mEffects.removeAt(i);
            ALOGV("removeEffect_l() effect %p, removed from chain %p at rank %d", effect.get(),
                    this, i);
            break;
        }
    }

    return mEffects.size();
}

// setDevice_l() must be called with PlaybackThread::mLock held
void AudioFlinger::EffectChain::setDevice_l(audio_devices_t device)
{
    size_t size = mEffects.size();
    for (size_t i = 0; i < size; i++) {
        mEffects[i]->setDevice(device);
    }
}

// setMode_l() must be called with PlaybackThread::mLock held
void AudioFlinger::EffectChain::setMode_l(audio_mode_t mode)
{
    size_t size = mEffects.size();
    for (size_t i = 0; i < size; i++) {
        mEffects[i]->setMode(mode);
    }
}

// setAudioSource_l() must be called with PlaybackThread::mLock held
void AudioFlinger::EffectChain::setAudioSource_l(audio_source_t source)
{
    size_t size = mEffects.size();
    for (size_t i = 0; i < size; i++) {
        mEffects[i]->setAudioSource(source);
    }
}

// setVolume_l() must be called with PlaybackThread::mLock held
bool AudioFlinger::EffectChain::setVolume_l(uint32_t *left, uint32_t *right)
{
    uint32_t newLeft = *left;
    uint32_t newRight = *right;
    bool hasControl = false;
    int ctrlIdx = -1;
    size_t size = mEffects.size();

    // first update volume controller
    for (size_t i = size; i > 0; i--) {
        if (mEffects[i - 1]->isProcessEnabled() &&
            (mEffects[i - 1]->desc().flags & EFFECT_FLAG_VOLUME_MASK) == EFFECT_FLAG_VOLUME_CTRL) {
            ctrlIdx = i - 1;
            hasControl = true;
            break;
        }
    }

    if (ctrlIdx == mVolumeCtrlIdx && *left == mLeftVolume && *right == mRightVolume) {
        if (hasControl) {
            *left = mNewLeftVolume;
            *right = mNewRightVolume;
        }
        return hasControl;
    }

    mVolumeCtrlIdx = ctrlIdx;
    mLeftVolume = newLeft;
    mRightVolume = newRight;

    // second get volume update from volume controller
    if (ctrlIdx >= 0) {
        mEffects[ctrlIdx]->setVolume(&newLeft, &newRight, true);
        mNewLeftVolume = newLeft;
        mNewRightVolume = newRight;
    }
    // then indicate volume to all other effects in chain.
    // Pass altered volume to effects before volume controller
    // and requested volume to effects after controller
    uint32_t lVol = newLeft;
    uint32_t rVol = newRight;

    for (size_t i = 0; i < size; i++) {
        if ((int)i == ctrlIdx) {
            continue;
        }
        // this also works for ctrlIdx == -1 when there is no volume controller
        if ((int)i > ctrlIdx) {
            lVol = *left;
            rVol = *right;
        }
        mEffects[i]->setVolume(&lVol, &rVol, false);
    }
    *left = newLeft;
    *right = newRight;

    return hasControl;
}

void AudioFlinger::EffectChain::dump(int fd, const Vector<String16>& args)
{
    const size_t SIZE = 256;
    char buffer[SIZE];
    String8 result;

    snprintf(buffer, SIZE, "Effects for session %d:\n", mSessionId);
    result.append(buffer);

    bool locked = AudioFlinger::dumpTryLock(mLock);
    // failed to lock - AudioFlinger is probably deadlocked
    if (!locked) {
        result.append("\tCould not lock mutex:\n");
    }

    result.append("\tNum fx In buffer   Out buffer   Active tracks:\n");
    snprintf(buffer, SIZE, "\t%02d     0x%08x  0x%08x   %d\n",
            mEffects.size(),
            (uint32_t)mInBuffer,
            (uint32_t)mOutBuffer,
            mActiveTrackCnt);
    result.append(buffer);
    write(fd, result.string(), result.size());

    for (size_t i = 0; i < mEffects.size(); ++i) {
        sp<EffectModule> effect = mEffects[i];
        if (effect != 0) {
            effect->dump(fd, args);
        }
    }

    if (locked) {
        mLock.unlock();
    }
}

// must be called with ThreadBase::mLock held
void AudioFlinger::EffectChain::setEffectSuspended_l(
        const effect_uuid_t *type, bool suspend)
{
    sp<SuspendedEffectDesc> desc;
    // use effect type UUID timelow as key as there is no real risk of identical
    // timeLow fields among effect type UUIDs.
    ssize_t index = mSuspendedEffects.indexOfKey(type->timeLow);
    if (suspend) {
        if (index >= 0) {
            desc = mSuspendedEffects.valueAt(index);
        } else {
            desc = new SuspendedEffectDesc();
            desc->mType = *type;
            mSuspendedEffects.add(type->timeLow, desc);
            ALOGV("setEffectSuspended_l() add entry for %08x", type->timeLow);
        }
        if (desc->mRefCount++ == 0) {
            sp<EffectModule> effect = getEffectIfEnabled(type);
            if (effect != 0) {
                desc->mEffect = effect;
                effect->setSuspended(true);
                effect->setEnabled(false);
            }
        }
    } else {
        if (index < 0) {
            return;
        }
        desc = mSuspendedEffects.valueAt(index);
        if (desc->mRefCount <= 0) {
            ALOGW("setEffectSuspended_l() restore refcount should not be 0 %d", desc->mRefCount);
            desc->mRefCount = 1;
        }
        if (--desc->mRefCount == 0) {
            ALOGV("setEffectSuspended_l() remove entry for %08x", mSuspendedEffects.keyAt(index));
            if (desc->mEffect != 0) {
                sp<EffectModule> effect = desc->mEffect.promote();
                if (effect != 0) {
                    effect->setSuspended(false);
                    effect->lock();
                    EffectHandle *handle = effect->controlHandle_l();
                    if (handle != NULL && !handle->destroyed_l()) {
                        effect->setEnabled_l(handle->enabled());
                    }
                    effect->unlock();
                }
                desc->mEffect.clear();
            }
            mSuspendedEffects.removeItemsAt(index);
        }
    }
}

// must be called with ThreadBase::mLock held
void AudioFlinger::EffectChain::setEffectSuspendedAll_l(bool suspend)
{
    sp<SuspendedEffectDesc> desc;

    ssize_t index = mSuspendedEffects.indexOfKey((int)kKeyForSuspendAll);
    if (suspend) {
        if (index >= 0) {
            desc = mSuspendedEffects.valueAt(index);
        } else {
            desc = new SuspendedEffectDesc();
            mSuspendedEffects.add((int)kKeyForSuspendAll, desc);
            ALOGV("setEffectSuspendedAll_l() add entry for 0");
        }
        if (desc->mRefCount++ == 0) {
            Vector< sp<EffectModule> > effects;
            getSuspendEligibleEffects(effects);
            for (size_t i = 0; i < effects.size(); i++) {
                setEffectSuspended_l(&effects[i]->desc().type, true);
            }
        }
    } else {
        if (index < 0) {
            return;
        }
        desc = mSuspendedEffects.valueAt(index);
        if (desc->mRefCount <= 0) {
            ALOGW("setEffectSuspendedAll_l() restore refcount should not be 0 %d", desc->mRefCount);
            desc->mRefCount = 1;
        }
        if (--desc->mRefCount == 0) {
            Vector<const effect_uuid_t *> types;
            for (size_t i = 0; i < mSuspendedEffects.size(); i++) {
                if (mSuspendedEffects.keyAt(i) == (int)kKeyForSuspendAll) {
                    continue;
                }
                types.add(&mSuspendedEffects.valueAt(i)->mType);
            }
            for (size_t i = 0; i < types.size(); i++) {
                setEffectSuspended_l(types[i], false);
            }
            ALOGV("setEffectSuspendedAll_l() remove entry for %08x",
                    mSuspendedEffects.keyAt(index));
            mSuspendedEffects.removeItem((int)kKeyForSuspendAll);
        }
    }
}


// The volume effect is used for automated tests only
#ifndef OPENSL_ES_H_
static const effect_uuid_t SL_IID_VOLUME_ = { 0x09e8ede0, 0xddde, 0x11db, 0xb4f6,
                                            { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b } };
const effect_uuid_t * const SL_IID_VOLUME = &SL_IID_VOLUME_;
#endif //OPENSL_ES_H_

bool AudioFlinger::EffectChain::isEffectEligibleForSuspend(const effect_descriptor_t& desc)
{
    // auxiliary effects and visualizer are never suspended on output mix
    if ((mSessionId == AUDIO_SESSION_OUTPUT_MIX) &&
        (((desc.flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_AUXILIARY) ||
         (memcmp(&desc.type, SL_IID_VISUALIZATION, sizeof(effect_uuid_t)) == 0) ||
         (memcmp(&desc.type, SL_IID_VOLUME, sizeof(effect_uuid_t)) == 0))) {
        return false;
    }
    return true;
}

void AudioFlinger::EffectChain::getSuspendEligibleEffects(
        Vector< sp<AudioFlinger::EffectModule> > &effects)
{
    effects.clear();
    for (size_t i = 0; i < mEffects.size(); i++) {
        if (isEffectEligibleForSuspend(mEffects[i]->desc())) {
            effects.add(mEffects[i]);
        }
    }
}

sp<AudioFlinger::EffectModule> AudioFlinger::EffectChain::getEffectIfEnabled(
                                                            const effect_uuid_t *type)
{
    sp<EffectModule> effect = getEffectFromType_l(type);
    return effect != 0 && effect->isEnabled() ? effect : 0;
}

void AudioFlinger::EffectChain::checkSuspendOnEffectEnabled(const sp<EffectModule>& effect,
                                                            bool enabled)
{
    ssize_t index = mSuspendedEffects.indexOfKey(effect->desc().type.timeLow);
    if (enabled) {
        if (index < 0) {
            // if the effect is not suspend check if all effects are suspended
            index = mSuspendedEffects.indexOfKey((int)kKeyForSuspendAll);
            if (index < 0) {
                return;
            }
            if (!isEffectEligibleForSuspend(effect->desc())) {
                return;
            }
            setEffectSuspended_l(&effect->desc().type, enabled);
            index = mSuspendedEffects.indexOfKey(effect->desc().type.timeLow);
            if (index < 0) {
                ALOGW("checkSuspendOnEffectEnabled() Fx should be suspended here!");
                return;
            }
        }
        ALOGV("checkSuspendOnEffectEnabled() enable suspending fx %08x",
            effect->desc().type.timeLow);
        sp<SuspendedEffectDesc> desc = mSuspendedEffects.valueAt(index);
        // if effect is requested to suspended but was not yet enabled, supend it now.
        if (desc->mEffect == 0) {
            desc->mEffect = effect;
            effect->setEnabled(false);
            effect->setSuspended(true);
        }
    } else {
        if (index < 0) {
            return;
        }
        ALOGV("checkSuspendOnEffectEnabled() disable restoring fx %08x",
            effect->desc().type.timeLow);
        sp<SuspendedEffectDesc> desc = mSuspendedEffects.valueAt(index);
        desc->mEffect.clear();
        effect->setSuspended(false);
    }
}

bool AudioFlinger::EffectChain::isNonOffloadableEnabled()
{
    Mutex::Autolock _l(mLock);
    size_t size = mEffects.size();
    for (size_t i = 0; i < size; i++) {
        if (mEffects[i]->isEnabled() && !mEffects[i]->isOffloadable()) {
            return true;
        }
    }
    return false;
}

}; // namespace android