diff --git a/media/libmedia/MediaPlayer2Manager.cpp b/media/libmedia/MediaPlayer2Manager.cpp
new file mode 100644
index 0000000..9b7f98a
--- /dev/null
+++ b/media/libmedia/MediaPlayer2Manager.cpp
@@ -0,0 +1,2391 @@
+/*
+**
+** Copyright 2017, 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.
+*/
+
+// Proxy for media player implementations
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "MediaPlayer2Manager"
+#include <utils/Log.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <dirent.h>
+#include <unistd.h>
+
+#include <string.h>
+
+#include <cutils/atomic.h>
+#include <cutils/properties.h> // for property_get
+
+#include <utils/misc.h>
+
+#include <binder/IPCThreadState.h>
+#include <binder/IServiceManager.h>
+#include <binder/MemoryHeapBase.h>
+#include <binder/MemoryBase.h>
+#include <gui/Surface.h>
+#include <utils/Errors.h>  // for status_t
+#include <utils/String8.h>
+#include <utils/SystemClock.h>
+#include <utils/Timers.h>
+#include <utils/Vector.h>
+
+#include <media/AudioPolicyHelper.h>
+#include <media/MediaHTTPService.h>
+#include <media/MediaPlayer2EngineClient.h>
+#include <media/MediaPlayer2Interface.h>
+#include <media/Metadata.h>
+#include <media/AudioTrack.h>
+#include <media/MemoryLeakTrackUtil.h>
+#include <media/stagefright/InterfaceUtils.h>
+#include <media/stagefright/MediaCodecList.h>
+#include <media/stagefright/MediaErrors.h>
+#include <media/stagefright/Utils.h>
+#include <media/stagefright/foundation/ADebug.h>
+#include <media/stagefright/foundation/ALooperRoster.h>
+#include <media/stagefright/SurfaceUtils.h>
+#include <mediautils/BatteryNotifier.h>
+
+#include <memunreachable/memunreachable.h>
+#include <system/audio.h>
+
+#include <private/android_filesystem_config.h>
+
+#include "MediaPlayer2Manager.h"
+#include "MediaPlayer2Factory.h"
+
+static const int kDumpLockRetries = 50;
+static const int kDumpLockSleepUs = 20000;
+
+namespace {
+using android::media::Metadata;
+using android::status_t;
+using android::OK;
+using android::BAD_VALUE;
+using android::NOT_ENOUGH_DATA;
+using android::Parcel;
+using android::media::VolumeShaper;
+
+// Max number of entries in the filter.
+const int kMaxFilterSize = 64;  // I pulled that out of thin air.
+
+const float kMaxRequiredSpeed = 8.0f; // for PCM tracks allow up to 8x speedup.
+
+// FIXME: Move all the metadata related function in the Metadata.cpp
+
+
+// Unmarshall a filter from a Parcel.
+// Filter format in a parcel:
+//
+//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       number of entries (n)                   |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       metadata type 1                         |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       metadata type 2                         |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  ....
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       metadata type n                         |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+// @param p Parcel that should start with a filter.
+// @param[out] filter On exit contains the list of metadata type to be
+//                    filtered.
+// @param[out] status On exit contains the status code to be returned.
+// @return true if the parcel starts with a valid filter.
+bool unmarshallFilter(const Parcel& p,
+                      Metadata::Filter *filter,
+                      status_t *status)
+{
+    int32_t val;
+    if (p.readInt32(&val) != OK)
+    {
+        ALOGE("Failed to read filter's length");
+        *status = NOT_ENOUGH_DATA;
+        return false;
+    }
+
+    if( val > kMaxFilterSize || val < 0)
+    {
+        ALOGE("Invalid filter len %d", val);
+        *status = BAD_VALUE;
+        return false;
+    }
+
+    const size_t num = val;
+
+    filter->clear();
+    filter->setCapacity(num);
+
+    size_t size = num * sizeof(Metadata::Type);
+
+
+    if (p.dataAvail() < size)
+    {
+        ALOGE("Filter too short expected %zu but got %zu", size, p.dataAvail());
+        *status = NOT_ENOUGH_DATA;
+        return false;
+    }
+
+    const Metadata::Type *data =
+            static_cast<const Metadata::Type*>(p.readInplace(size));
+
+    if (NULL == data)
+    {
+        ALOGE("Filter had no data");
+        *status = BAD_VALUE;
+        return false;
+    }
+
+    // TODO: The stl impl of vector would be more efficient here
+    // because it degenerates into a memcpy on pod types. Try to
+    // replace later or use stl::set.
+    for (size_t i = 0; i < num; ++i)
+    {
+        filter->add(*data);
+        ++data;
+    }
+    *status = OK;
+    return true;
+}
+
+// @param filter Of metadata type.
+// @param val To be searched.
+// @return true if a match was found.
+bool findMetadata(const Metadata::Filter& filter, const int32_t val)
+{
+    // Deal with empty and ANY right away
+    if (filter.isEmpty()) return false;
+    if (filter[0] == Metadata::kAny) return true;
+
+    return filter.indexOf(val) >= 0;
+}
+
+}  // anonymous namespace
+
+
+namespace {
+using android::Parcel;
+using android::String16;
+
+// marshalling tag indicating flattened utf16 tags
+// keep in sync with frameworks/base/media/java/android/media/AudioAttributes.java
+const int32_t kAudioAttributesMarshallTagFlattenTags = 1;
+
+// Audio attributes format in a parcel:
+//
+//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       usage                                   |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       content_type                            |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       source                                  |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       flags                                   |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       kAudioAttributesMarshallTagFlattenTags  | // ignore tags if not found
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       flattened tags in UTF16                 |
+// |                         ...                                   |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+// @param p Parcel that contains audio attributes.
+// @param[out] attributes On exit points to an initialized audio_attributes_t structure
+// @param[out] status On exit contains the status code to be returned.
+void unmarshallAudioAttributes(const Parcel& parcel, audio_attributes_t *attributes)
+{
+    attributes->usage = (audio_usage_t) parcel.readInt32();
+    attributes->content_type = (audio_content_type_t) parcel.readInt32();
+    attributes->source = (audio_source_t) parcel.readInt32();
+    attributes->flags = (audio_flags_mask_t) parcel.readInt32();
+    const bool hasFlattenedTag = (parcel.readInt32() == kAudioAttributesMarshallTagFlattenTags);
+    if (hasFlattenedTag) {
+        // the tags are UTF16, convert to UTF8
+        String16 tags = parcel.readString16();
+        ssize_t realTagSize = utf16_to_utf8_length(tags.string(), tags.size());
+        if (realTagSize <= 0) {
+            strcpy(attributes->tags, "");
+        } else {
+            // copy the flattened string into the attributes as the destination for the conversion:
+            // copying array size -1, array for tags was calloc'd, no need to NULL-terminate it
+            size_t tagSize = realTagSize > AUDIO_ATTRIBUTES_TAGS_MAX_SIZE - 1 ?
+                    AUDIO_ATTRIBUTES_TAGS_MAX_SIZE - 1 : realTagSize;
+            utf16_to_utf8(tags.string(), tagSize, attributes->tags,
+                    sizeof(attributes->tags) / sizeof(attributes->tags[0]));
+        }
+    } else {
+        ALOGE("unmarshallAudioAttributes() received unflattened tags, ignoring tag values");
+        strcpy(attributes->tags, "");
+    }
+}
+} // anonymous namespace
+
+
+namespace android {
+
+extern ALooperRoster gLooperRoster;
+
+MediaPlayer2Manager gMediaPlayer2Manager;
+
+static bool checkPermission(const char* permissionString) {
+    if (getpid() == IPCThreadState::self()->getCallingPid()) return true;
+    bool ok = checkCallingPermission(String16(permissionString));
+    if (!ok) ALOGE("Request requires %s", permissionString);
+    return ok;
+}
+
+// TODO: Find real cause of Audio/Video delay in PV framework and remove this workaround
+/* static */ int MediaPlayer2Manager::AudioOutput::mMinBufferCount = 4;
+/* static */ bool MediaPlayer2Manager::AudioOutput::mIsOnEmulator = false;
+
+// static
+MediaPlayer2Manager& MediaPlayer2Manager::get() {
+    return gMediaPlayer2Manager;
+}
+
+MediaPlayer2Manager::MediaPlayer2Manager() {
+    ALOGV("MediaPlayer2Manager created");
+    // TODO: remove all unnecessary pid/uid handling.
+    mPid = IPCThreadState::self()->getCallingPid();
+    mUid = IPCThreadState::self()->getCallingUid();
+    mNextConnId = 1;
+
+    MediaPlayer2Factory::registerBuiltinFactories();
+}
+
+MediaPlayer2Manager::~MediaPlayer2Manager() {
+    ALOGV("MediaPlayer2Manager destroyed");
+}
+
+sp<MediaPlayer2Engine> MediaPlayer2Manager::create(
+        const sp<MediaPlayer2EngineClient>& client,
+        audio_session_t audioSessionId)
+{
+    int32_t connId = android_atomic_inc(&mNextConnId);
+
+    sp<Client> c = new Client(
+            mPid, connId, client, audioSessionId, mUid);
+
+    ALOGV("Create new client(%d) from pid %d, uid %d, ", connId, mPid, mUid);
+
+    wp<Client> w = c;
+    {
+        Mutex::Autolock lock(mLock);
+        mClients.add(w);
+    }
+    return c;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::dump(int fd, const Vector<String16>& args) const
+{
+    const size_t SIZE = 256;
+    char buffer[SIZE];
+    String8 result;
+
+    result.append(" AudioOutput\n");
+    snprintf(buffer, 255, "  stream type(%d), left - right volume(%f, %f)\n",
+            mStreamType, mLeftVolume, mRightVolume);
+    result.append(buffer);
+    snprintf(buffer, 255, "  msec per frame(%f), latency (%d)\n",
+            mMsecsPerFrame, (mTrack != 0) ? mTrack->latency() : -1);
+    result.append(buffer);
+    snprintf(buffer, 255, "  aux effect id(%d), send level (%f)\n",
+            mAuxEffectId, mSendLevel);
+    result.append(buffer);
+
+    ::write(fd, result.string(), result.size());
+    if (mTrack != 0) {
+        mTrack->dump(fd, args);
+    }
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::dump(int fd, const Vector<String16>& args)
+{
+    const size_t SIZE = 256;
+    char buffer[SIZE];
+    String8 result;
+    result.append(" Client\n");
+    snprintf(buffer, 255, "  pid(%d), connId(%d), status(%d), looping(%s)\n",
+            mPid, mConnId, mStatus, mLoop?"true": "false");
+    result.append(buffer);
+
+    sp<MediaPlayer2Base> p;
+    sp<AudioOutput> audioOutput;
+    bool locked = false;
+    for (int i = 0; i < kDumpLockRetries; ++i) {
+        if (mLock.tryLock() == NO_ERROR) {
+            locked = true;
+            break;
+        }
+        usleep(kDumpLockSleepUs);
+    }
+
+    if (locked) {
+        p = mPlayer;
+        audioOutput = mAudioOutput;
+        mLock.unlock();
+    } else {
+        result.append("  lock is taken, no dump from player and audio output\n");
+    }
+    write(fd, result.string(), result.size());
+
+    if (p != NULL) {
+        p->dump(fd, args);
+    }
+    if (audioOutput != 0) {
+        audioOutput->dump(fd, args);
+    }
+    write(fd, "\n", 1);
+    return NO_ERROR;
+}
+
+/**
+ * The only arguments this understands right now are -c, -von and -voff,
+ * which are parsed by ALooperRoster::dump()
+ */
+status_t MediaPlayer2Manager::dump(int fd, const Vector<String16>& args)
+{
+    const size_t SIZE = 256;
+    char buffer[SIZE];
+    String8 result;
+    SortedVector< sp<Client> > clients; //to serialise the mutex unlock & client destruction.
+
+    if (checkCallingPermission(String16("android.permission.DUMP")) == false) {
+        snprintf(buffer, SIZE, "Permission Denial: "
+                "can't dump MediaPlayer2Manager from pid=%d, uid=%d\n",
+                mPid, mUid);
+        result.append(buffer);
+    } else {
+        Mutex::Autolock lock(mLock);
+        for (int i = 0, n = mClients.size(); i < n; ++i) {
+            sp<Client> c = mClients[i].promote();
+            if (c != 0) c->dump(fd, args);
+            clients.add(c);
+        }
+
+        result.append(" Files opened and/or mapped:\n");
+        snprintf(buffer, SIZE, "/proc/%d/maps", getpid());
+        FILE *f = fopen(buffer, "r");
+        if (f) {
+            while (!feof(f)) {
+                fgets(buffer, SIZE, f);
+                if (strstr(buffer, " /storage/") ||
+                    strstr(buffer, " /system/sounds/") ||
+                    strstr(buffer, " /data/") ||
+                    strstr(buffer, " /system/media/")) {
+                    result.append("  ");
+                    result.append(buffer);
+                }
+            }
+            fclose(f);
+        } else {
+            result.append("couldn't open ");
+            result.append(buffer);
+            result.append("\n");
+        }
+
+        snprintf(buffer, SIZE, "/proc/%d/fd", getpid());
+        DIR *d = opendir(buffer);
+        if (d) {
+            struct dirent *ent;
+            while((ent = readdir(d)) != NULL) {
+                if (strcmp(ent->d_name,".") && strcmp(ent->d_name,"..")) {
+                    snprintf(buffer, SIZE, "/proc/%d/fd/%s", getpid(), ent->d_name);
+                    struct stat s;
+                    if (lstat(buffer, &s) == 0) {
+                        if ((s.st_mode & S_IFMT) == S_IFLNK) {
+                            char linkto[256];
+                            int len = readlink(buffer, linkto, sizeof(linkto));
+                            if(len > 0) {
+                                if(len > 255) {
+                                    linkto[252] = '.';
+                                    linkto[253] = '.';
+                                    linkto[254] = '.';
+                                    linkto[255] = 0;
+                                } else {
+                                    linkto[len] = 0;
+                                }
+                                if (strstr(linkto, "/storage/") == linkto ||
+                                    strstr(linkto, "/system/sounds/") == linkto ||
+                                    strstr(linkto, "/data/") == linkto ||
+                                    strstr(linkto, "/system/media/") == linkto) {
+                                    result.append("  ");
+                                    result.append(buffer);
+                                    result.append(" -> ");
+                                    result.append(linkto);
+                                    result.append("\n");
+                                }
+                            }
+                        } else {
+                            result.append("  unexpected type for ");
+                            result.append(buffer);
+                            result.append("\n");
+                        }
+                    }
+                }
+            }
+            closedir(d);
+        } else {
+            result.append("couldn't open ");
+            result.append(buffer);
+            result.append("\n");
+        }
+
+        gLooperRoster.dump(fd, args);
+
+        bool dumpMem = false;
+        bool unreachableMemory = false;
+        for (size_t i = 0; i < args.size(); i++) {
+            if (args[i] == String16("-m")) {
+                dumpMem = true;
+            } else if (args[i] == String16("--unreachable")) {
+                unreachableMemory = true;
+            }
+        }
+        if (dumpMem) {
+            result.append("\nDumping memory:\n");
+            std::string s = dumpMemoryAddresses(100 /* limit */);
+            result.append(s.c_str(), s.size());
+        }
+        if (unreachableMemory) {
+            result.append("\nDumping unreachable memory:\n");
+            // TODO - should limit be an argument parameter?
+            std::string s = GetUnreachableMemoryString(true /* contents */, 10000 /* limit */);
+            result.append(s.c_str(), s.size());
+        }
+    }
+    write(fd, result.string(), result.size());
+    return NO_ERROR;
+}
+
+void MediaPlayer2Manager::removeClient(const wp<Client>& client)
+{
+    Mutex::Autolock lock(mLock);
+    mClients.remove(client);
+}
+
+bool MediaPlayer2Manager::hasClient(wp<Client> client)
+{
+    Mutex::Autolock lock(mLock);
+    return mClients.indexOf(client) != NAME_NOT_FOUND;
+}
+
+MediaPlayer2Manager::Client::Client(
+        pid_t pid,
+        int32_t connId,
+        const sp<MediaPlayer2EngineClient>& client,
+        audio_session_t audioSessionId,
+        uid_t uid)
+{
+    ALOGV("Client(%d) constructor", connId);
+    mPid = pid;
+    mConnId = connId;
+    mClient = client;
+    mLoop = false;
+    mStatus = NO_INIT;
+    mAudioSessionId = audioSessionId;
+    mUid = uid;
+    mRetransmitEndpointValid = false;
+    mAudioAttributes = NULL;
+
+#if CALLBACK_ANTAGONIZER
+    ALOGD("create Antagonizer");
+    mAntagonizer = new Antagonizer(notify, this);
+#endif
+}
+
+MediaPlayer2Manager::Client::~Client()
+{
+    ALOGV("Client(%d) destructor pid = %d", mConnId, mPid);
+    mAudioOutput.clear();
+    wp<Client> client(this);
+    disconnect();
+    gMediaPlayer2Manager.removeClient(client);
+    if (mAudioAttributes != NULL) {
+        free(mAudioAttributes);
+    }
+    mAudioDeviceUpdatedListener.clear();
+}
+
+void MediaPlayer2Manager::Client::disconnect()
+{
+    ALOGV("disconnect(%d) from pid %d", mConnId, mPid);
+    // grab local reference and clear main reference to prevent future
+    // access to object
+    sp<MediaPlayer2Base> p;
+    {
+        Mutex::Autolock l(mLock);
+        p = mPlayer;
+        mClient.clear();
+        mPlayer.clear();
+    }
+
+    // clear the notification to prevent callbacks to dead client
+    // and reset the player. We assume the player will serialize
+    // access to itself if necessary.
+    if (p != 0) {
+        p->setNotifyCallback(0, 0);
+#if CALLBACK_ANTAGONIZER
+        ALOGD("kill Antagonizer");
+        mAntagonizer->kill();
+#endif
+        p->reset();
+    }
+
+    {
+        Mutex::Autolock l(mLock);
+        disconnectNativeWindow_l();
+    }
+
+    IPCThreadState::self()->flushCommands();
+}
+
+sp<MediaPlayer2Base> MediaPlayer2Manager::Client::createPlayer(player2_type playerType)
+{
+    // determine if we have the right player type
+    sp<MediaPlayer2Base> p = getPlayer();
+    if ((p != NULL) && (p->playerType() != playerType)) {
+        ALOGV("delete player");
+        p.clear();
+    }
+    if (p == NULL) {
+        p = MediaPlayer2Factory::createPlayer(playerType, this, notify, mPid);
+    }
+
+    if (p != NULL) {
+        p->setUID(mUid);
+    }
+
+    return p;
+}
+
+void MediaPlayer2Manager::Client::AudioDeviceUpdatedNotifier::onAudioDeviceUpdate(
+        audio_io_handle_t audioIo,
+        audio_port_handle_t deviceId) {
+    sp<MediaPlayer2Base> listener = mListener.promote();
+    if (listener != NULL) {
+        listener->sendEvent(MEDIA2_AUDIO_ROUTING_CHANGED, audioIo, deviceId);
+    } else {
+        ALOGW("listener for process %d death is gone", MEDIA2_AUDIO_ROUTING_CHANGED);
+    }
+}
+
+sp<MediaPlayer2Base> MediaPlayer2Manager::Client::setDataSource_pre(
+        player2_type playerType)
+{
+    ALOGV("player type = %d", playerType);
+
+    // create the right type of player
+    sp<MediaPlayer2Base> p = createPlayer(playerType);
+    if (p == NULL) {
+        return p;
+    }
+
+    Mutex::Autolock lock(mLock);
+
+    mAudioDeviceUpdatedListener = new AudioDeviceUpdatedNotifier(p);
+
+    if (!p->hardwareOutput()) {
+        mAudioOutput = new AudioOutput(mAudioSessionId, mUid,
+                mPid, mAudioAttributes, mAudioDeviceUpdatedListener);
+        static_cast<MediaPlayer2Interface*>(p.get())->setAudioSink(mAudioOutput);
+    }
+
+    return p;
+}
+
+status_t MediaPlayer2Manager::Client::setDataSource_post(
+        const sp<MediaPlayer2Base>& p,
+        status_t status)
+{
+    ALOGV(" setDataSource");
+    if (status != OK) {
+        ALOGE("  error: %d", status);
+        return status;
+    }
+
+    // Set the re-transmission endpoint if one was chosen.
+    if (mRetransmitEndpointValid) {
+        status = p->setRetransmitEndpoint(&mRetransmitEndpoint);
+        if (status != NO_ERROR) {
+            ALOGE("setRetransmitEndpoint error: %d", status);
+        }
+    }
+
+    if (status == OK) {
+        Mutex::Autolock lock(mLock);
+        mPlayer = p;
+    }
+    return status;
+}
+
+status_t MediaPlayer2Manager::Client::setDataSource(
+        const sp<MediaHTTPService> &httpService,
+        const char *url,
+        const KeyedVector<String8, String8> *headers)
+{
+    ALOGV("setDataSource(%s)", url);
+    if (url == NULL)
+        return UNKNOWN_ERROR;
+
+    if ((strncmp(url, "http://", 7) == 0) ||
+        (strncmp(url, "https://", 8) == 0) ||
+        (strncmp(url, "rtsp://", 7) == 0)) {
+        if (!checkPermission("android.permission.INTERNET")) {
+            return PERMISSION_DENIED;
+        }
+    }
+
+    if (strncmp(url, "content://", 10) == 0) {
+        ALOGE("setDataSource: content scheme is not supported here");
+        mStatus = UNKNOWN_ERROR;
+        return mStatus;
+    } else {
+        player2_type playerType = MediaPlayer2Factory::getPlayerType(this, url);
+        sp<MediaPlayer2Base> p = setDataSource_pre(playerType);
+        if (p == NULL) {
+            return NO_INIT;
+        }
+
+        return mStatus =
+                setDataSource_post(
+                p, p->setDataSource(httpService, url, headers));
+    }
+}
+
+status_t MediaPlayer2Manager::Client::setDataSource(int fd, int64_t offset, int64_t length)
+{
+    ALOGV("setDataSource fd=%d (%s), offset=%lld, length=%lld",
+            fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
+    struct stat sb;
+    int ret = fstat(fd, &sb);
+    if (ret != 0) {
+        ALOGE("fstat(%d) failed: %d, %s", fd, ret, strerror(errno));
+        return UNKNOWN_ERROR;
+    }
+
+    ALOGV("st_dev  = %llu", static_cast<unsigned long long>(sb.st_dev));
+    ALOGV("st_mode = %u", sb.st_mode);
+    ALOGV("st_uid  = %lu", static_cast<unsigned long>(sb.st_uid));
+    ALOGV("st_gid  = %lu", static_cast<unsigned long>(sb.st_gid));
+    ALOGV("st_size = %llu", static_cast<unsigned long long>(sb.st_size));
+
+    if (offset >= sb.st_size) {
+        ALOGE("offset error");
+        return UNKNOWN_ERROR;
+    }
+    if (offset + length > sb.st_size) {
+        length = sb.st_size - offset;
+        ALOGV("calculated length = %lld", (long long)length);
+    }
+
+    player2_type playerType = MediaPlayer2Factory::getPlayerType(this,
+                                                               fd,
+                                                               offset,
+                                                               length);
+    sp<MediaPlayer2Base> p = setDataSource_pre(playerType);
+    if (p == NULL) {
+        return NO_INIT;
+    }
+
+    // now set data source
+    return mStatus = setDataSource_post(p, p->setDataSource(fd, offset, length));
+}
+
+status_t MediaPlayer2Manager::Client::setDataSource(
+        const sp<IStreamSource> &source) {
+    // create the right type of player
+    player2_type playerType = MediaPlayer2Factory::getPlayerType(this, source);
+    sp<MediaPlayer2Base> p = setDataSource_pre(playerType);
+    if (p == NULL) {
+        return NO_INIT;
+    }
+
+    // now set data source
+    return mStatus = setDataSource_post(p, p->setDataSource(source));
+}
+
+status_t MediaPlayer2Manager::Client::setDataSource(
+        const sp<IDataSource> &source) {
+    sp<DataSource> dataSource = CreateDataSourceFromIDataSource(source);
+    player2_type playerType = MediaPlayer2Factory::getPlayerType(this, dataSource);
+    sp<MediaPlayer2Base> p = setDataSource_pre(playerType);
+    if (p == NULL) {
+        return NO_INIT;
+    }
+    // now set data source
+    return mStatus = setDataSource_post(p, p->setDataSource(dataSource));
+}
+
+void MediaPlayer2Manager::Client::disconnectNativeWindow_l() {
+    if (mConnectedWindow != NULL) {
+        status_t err = nativeWindowDisconnect(
+                mConnectedWindow.get(), "disconnectNativeWindow");
+
+        if (err != OK) {
+            ALOGW("nativeWindowDisconnect returned an error: %s (%d)",
+                    strerror(-err), err);
+        }
+    }
+    mConnectedWindow.clear();
+}
+
+status_t MediaPlayer2Manager::Client::setVideoSurfaceTexture(
+        const sp<IGraphicBufferProducer>& bufferProducer)
+{
+    ALOGV("[%d] setVideoSurfaceTexture(%p)", mConnId, bufferProducer.get());
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+
+    sp<IBinder> binder(IInterface::asBinder(bufferProducer));
+    if (mConnectedWindowBinder == binder) {
+        return OK;
+    }
+
+    sp<ANativeWindow> anw;
+    if (bufferProducer != NULL) {
+        anw = new Surface(bufferProducer, true /* controlledByApp */);
+        status_t err = nativeWindowConnect(anw.get(), "setVideoSurfaceTexture");
+
+        if (err != OK) {
+            ALOGE("setVideoSurfaceTexture failed: %d", err);
+            // Note that we must do the reset before disconnecting from the ANW.
+            // Otherwise queue/dequeue calls could be made on the disconnected
+            // ANW, which may result in errors.
+            reset();
+
+            Mutex::Autolock lock(mLock);
+            disconnectNativeWindow_l();
+
+            return err;
+        }
+    }
+
+    // Note that we must set the player's new GraphicBufferProducer before
+    // disconnecting the old one.  Otherwise queue/dequeue calls could be made
+    // on the disconnected ANW, which may result in errors.
+    status_t err = p->setVideoSurfaceTexture(bufferProducer);
+
+    mLock.lock();
+    disconnectNativeWindow_l();
+
+    if (err == OK) {
+        mConnectedWindow = anw;
+        mConnectedWindowBinder = binder;
+        mLock.unlock();
+    } else {
+        mLock.unlock();
+        status_t err = nativeWindowDisconnect(
+                anw.get(), "disconnectNativeWindow");
+
+        if (err != OK) {
+            ALOGW("nativeWindowDisconnect returned an error: %s (%d)",
+                    strerror(-err), err);
+        }
+    }
+
+    return err;
+}
+
+status_t MediaPlayer2Manager::Client::invoke(const Parcel& request,
+                                            Parcel *reply)
+{
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == NULL) return UNKNOWN_ERROR;
+    return p->invoke(request, reply);
+}
+
+// This call doesn't need to access the native player.
+status_t MediaPlayer2Manager::Client::setMetadataFilter(const Parcel& filter)
+{
+    status_t status;
+    media::Metadata::Filter allow, drop;
+
+    if (unmarshallFilter(filter, &allow, &status) &&
+        unmarshallFilter(filter, &drop, &status)) {
+        Mutex::Autolock lock(mLock);
+
+        mMetadataAllow = allow;
+        mMetadataDrop = drop;
+    }
+    return status;
+}
+
+status_t MediaPlayer2Manager::Client::getMetadata(
+        bool update_only, bool /*apply_filter*/, Parcel *reply)
+{
+    sp<MediaPlayer2Base> player = getPlayer();
+    if (player == 0) return UNKNOWN_ERROR;
+
+    status_t status;
+    // Placeholder for the return code, updated by the caller.
+    reply->writeInt32(-1);
+
+    media::Metadata::Filter ids;
+
+    // We don't block notifications while we fetch the data. We clear
+    // mMetadataUpdated first so we don't lose notifications happening
+    // during the rest of this call.
+    {
+        Mutex::Autolock lock(mLock);
+        if (update_only) {
+            ids = mMetadataUpdated;
+        }
+        mMetadataUpdated.clear();
+    }
+
+    media::Metadata metadata(reply);
+
+    metadata.appendHeader();
+    status = player->getMetadata(ids, reply);
+
+    if (status != OK) {
+        metadata.resetParcel();
+        ALOGE("getMetadata failed %d", status);
+        return status;
+    }
+
+    // FIXME: ement filtering on the result. Not critical since
+    // filtering takes place on the update notifications already. This
+    // would be when all the metadata are fetch and a filter is set.
+
+    // Everything is fine, update the metadata length.
+    metadata.updateLength();
+    return OK;
+}
+
+status_t MediaPlayer2Manager::Client::setBufferingSettings(
+        const BufferingSettings& buffering)
+{
+    ALOGV("[%d] setBufferingSettings{%s}",
+            mConnId, buffering.toString().string());
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->setBufferingSettings(buffering);
+}
+
+status_t MediaPlayer2Manager::Client::getBufferingSettings(
+        BufferingSettings* buffering /* nonnull */)
+{
+    sp<MediaPlayer2Base> p = getPlayer();
+    // TODO: create mPlayer on demand.
+    if (p == 0) return UNKNOWN_ERROR;
+    status_t ret = p->getBufferingSettings(buffering);
+    if (ret == NO_ERROR) {
+        ALOGV("[%d] getBufferingSettings{%s}",
+                mConnId, buffering->toString().string());
+    } else {
+        ALOGE("[%d] getBufferingSettings returned %d", mConnId, ret);
+    }
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::prepareAsync()
+{
+    ALOGV("[%d] prepareAsync", mConnId);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    status_t ret = p->prepareAsync();
+#if CALLBACK_ANTAGONIZER
+    ALOGD("start Antagonizer");
+    if (ret == NO_ERROR) mAntagonizer->start();
+#endif
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::start()
+{
+    ALOGV("[%d] start", mConnId);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    p->setLooping(mLoop);
+    return p->start();
+}
+
+status_t MediaPlayer2Manager::Client::stop()
+{
+    ALOGV("[%d] stop", mConnId);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->stop();
+}
+
+status_t MediaPlayer2Manager::Client::pause()
+{
+    ALOGV("[%d] pause", mConnId);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->pause();
+}
+
+status_t MediaPlayer2Manager::Client::isPlaying(bool* state)
+{
+    *state = false;
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    *state = p->isPlaying();
+    ALOGV("[%d] isPlaying: %d", mConnId, *state);
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::setPlaybackSettings(const AudioPlaybackRate& rate)
+{
+    ALOGV("[%d] setPlaybackSettings(%f, %f, %d, %d)",
+            mConnId, rate.mSpeed, rate.mPitch, rate.mFallbackMode, rate.mStretchMode);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->setPlaybackSettings(rate);
+}
+
+status_t MediaPlayer2Manager::Client::getPlaybackSettings(AudioPlaybackRate* rate /* nonnull */)
+{
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    status_t ret = p->getPlaybackSettings(rate);
+    if (ret == NO_ERROR) {
+        ALOGV("[%d] getPlaybackSettings(%f, %f, %d, %d)",
+                mConnId, rate->mSpeed, rate->mPitch, rate->mFallbackMode, rate->mStretchMode);
+    } else {
+        ALOGV("[%d] getPlaybackSettings returned %d", mConnId, ret);
+    }
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::setSyncSettings(
+        const AVSyncSettings& sync, float videoFpsHint)
+{
+    ALOGV("[%d] setSyncSettings(%u, %u, %f, %f)",
+            mConnId, sync.mSource, sync.mAudioAdjustMode, sync.mTolerance, videoFpsHint);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->setSyncSettings(sync, videoFpsHint);
+}
+
+status_t MediaPlayer2Manager::Client::getSyncSettings(
+        AVSyncSettings* sync /* nonnull */, float* videoFps /* nonnull */)
+{
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    status_t ret = p->getSyncSettings(sync, videoFps);
+    if (ret == NO_ERROR) {
+        ALOGV("[%d] getSyncSettings(%u, %u, %f, %f)",
+                mConnId, sync->mSource, sync->mAudioAdjustMode, sync->mTolerance, *videoFps);
+    } else {
+        ALOGV("[%d] getSyncSettings returned %d", mConnId, ret);
+    }
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::getCurrentPosition(int *msec)
+{
+    ALOGV("getCurrentPosition");
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    status_t ret = p->getCurrentPosition(msec);
+    if (ret == NO_ERROR) {
+        ALOGV("[%d] getCurrentPosition = %d", mConnId, *msec);
+    } else {
+        ALOGE("getCurrentPosition returned %d", ret);
+    }
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::getDuration(int *msec)
+{
+    ALOGV("getDuration");
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    status_t ret = p->getDuration(msec);
+    if (ret == NO_ERROR) {
+        ALOGV("[%d] getDuration = %d", mConnId, *msec);
+    } else {
+        ALOGE("getDuration returned %d", ret);
+    }
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::setNextPlayer(const sp<MediaPlayer2Engine>& player) {
+    ALOGV("setNextPlayer");
+    Mutex::Autolock l(mLock);
+    sp<Client> c = static_cast<Client*>(player.get());
+    if (c != NULL && !gMediaPlayer2Manager.hasClient(c)) {
+      return BAD_VALUE;
+    }
+
+    mNextClient = c;
+
+    if (c != NULL) {
+        if (mAudioOutput != NULL) {
+            mAudioOutput->setNextOutput(c->mAudioOutput);
+        } else if ((mPlayer != NULL) && !mPlayer->hardwareOutput()) {
+            ALOGE("no current audio output");
+        }
+
+        if ((mPlayer != NULL) && (mNextClient->getPlayer() != NULL)) {
+            mPlayer->setNextPlayer(mNextClient->getPlayer());
+        }
+    }
+
+    return OK;
+}
+
+VolumeShaper::Status MediaPlayer2Manager::Client::applyVolumeShaper(
+        const sp<VolumeShaper::Configuration>& configuration,
+        const sp<VolumeShaper::Operation>& operation) {
+    // for hardware output, call player instead
+    ALOGV("Client::applyVolumeShaper(%p)", this);
+    sp<MediaPlayer2Base> p = getPlayer();
+    {
+        Mutex::Autolock l(mLock);
+        if (p != 0 && p->hardwareOutput()) {
+            // TODO: investigate internal implementation
+            return VolumeShaper::Status(INVALID_OPERATION);
+        }
+        if (mAudioOutput.get() != nullptr) {
+            return mAudioOutput->applyVolumeShaper(configuration, operation);
+        }
+    }
+    return VolumeShaper::Status(INVALID_OPERATION);
+}
+
+sp<VolumeShaper::State> MediaPlayer2Manager::Client::getVolumeShaperState(int id) {
+    // for hardware output, call player instead
+    ALOGV("Client::getVolumeShaperState(%p)", this);
+    sp<MediaPlayer2Base> p = getPlayer();
+    {
+        Mutex::Autolock l(mLock);
+        if (p != 0 && p->hardwareOutput()) {
+            // TODO: investigate internal implementation.
+            return nullptr;
+        }
+        if (mAudioOutput.get() != nullptr) {
+            return mAudioOutput->getVolumeShaperState(id);
+        }
+    }
+    return nullptr;
+}
+
+status_t MediaPlayer2Manager::Client::seekTo(int msec, MediaPlayer2SeekMode mode)
+{
+    ALOGV("[%d] seekTo(%d, %d)", mConnId, msec, mode);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->seekTo(msec, mode);
+}
+
+status_t MediaPlayer2Manager::Client::reset()
+{
+    ALOGV("[%d] reset", mConnId);
+    mRetransmitEndpointValid = false;
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->reset();
+}
+
+status_t MediaPlayer2Manager::Client::notifyAt(int64_t mediaTimeUs)
+{
+    ALOGV("[%d] notifyAt(%lld)", mConnId, (long long)mediaTimeUs);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->notifyAt(mediaTimeUs);
+}
+
+status_t MediaPlayer2Manager::Client::setAudioStreamType(audio_stream_type_t type)
+{
+    ALOGV("[%d] setAudioStreamType(%d)", mConnId, type);
+    // TODO: for hardware output, call player instead
+    Mutex::Autolock l(mLock);
+    if (mAudioOutput != 0) mAudioOutput->setAudioStreamType(type);
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::setAudioAttributes_l(const Parcel &parcel)
+{
+    if (mAudioAttributes != NULL) { free(mAudioAttributes); }
+    mAudioAttributes = (audio_attributes_t *) calloc(1, sizeof(audio_attributes_t));
+    if (mAudioAttributes == NULL) {
+        return NO_MEMORY;
+    }
+    unmarshallAudioAttributes(parcel, mAudioAttributes);
+
+    ALOGV("setAudioAttributes_l() usage=%d content=%d flags=0x%x tags=%s",
+            mAudioAttributes->usage, mAudioAttributes->content_type, mAudioAttributes->flags,
+            mAudioAttributes->tags);
+
+    if (mAudioOutput != 0) {
+        mAudioOutput->setAudioAttributes(mAudioAttributes);
+    }
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::setLooping(int loop)
+{
+    ALOGV("[%d] setLooping(%d)", mConnId, loop);
+    mLoop = loop;
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p != 0) return p->setLooping(loop);
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::setVolume(float leftVolume, float rightVolume)
+{
+    ALOGV("[%d] setVolume(%f, %f)", mConnId, leftVolume, rightVolume);
+
+    // for hardware output, call player instead
+    sp<MediaPlayer2Base> p = getPlayer();
+    {
+      Mutex::Autolock l(mLock);
+      if (p != 0 && p->hardwareOutput()) {
+          MediaPlayerHWInterface* hwp =
+                  reinterpret_cast<MediaPlayerHWInterface*>(p.get());
+          return hwp->setVolume(leftVolume, rightVolume);
+      } else {
+          if (mAudioOutput != 0) mAudioOutput->setVolume(leftVolume, rightVolume);
+          return NO_ERROR;
+      }
+    }
+
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::setAuxEffectSendLevel(float level)
+{
+    ALOGV("[%d] setAuxEffectSendLevel(%f)", mConnId, level);
+    Mutex::Autolock l(mLock);
+    if (mAudioOutput != 0) return mAudioOutput->setAuxEffectSendLevel(level);
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::attachAuxEffect(int effectId)
+{
+    ALOGV("[%d] attachAuxEffect(%d)", mConnId, effectId);
+    Mutex::Autolock l(mLock);
+    if (mAudioOutput != 0) return mAudioOutput->attachAuxEffect(effectId);
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::setParameter(int key, const Parcel &request) {
+    ALOGV("[%d] setParameter(%d)", mConnId, key);
+    switch (key) {
+    case MEDIA2_KEY_PARAMETER_AUDIO_ATTRIBUTES:
+    {
+        Mutex::Autolock l(mLock);
+        return setAudioAttributes_l(request);
+    }
+    default:
+        sp<MediaPlayer2Base> p = getPlayer();
+        if (p == 0) { return UNKNOWN_ERROR; }
+        return p->setParameter(key, request);
+    }
+}
+
+status_t MediaPlayer2Manager::Client::getParameter(int key, Parcel *reply) {
+    ALOGV("[%d] getParameter(%d)", mConnId, key);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+    return p->getParameter(key, reply);
+}
+
+status_t MediaPlayer2Manager::Client::setRetransmitEndpoint(
+        const struct sockaddr_in* endpoint) {
+
+    if (NULL != endpoint) {
+        uint32_t a = ntohl(endpoint->sin_addr.s_addr);
+        uint16_t p = ntohs(endpoint->sin_port);
+        ALOGV("[%d] setRetransmitEndpoint(%u.%u.%u.%u:%hu)", mConnId,
+                (a >> 24), (a >> 16) & 0xFF, (a >> 8) & 0xFF, (a & 0xFF), p);
+    } else {
+        ALOGV("[%d] setRetransmitEndpoint = <none>", mConnId);
+    }
+
+    sp<MediaPlayer2Base> p = getPlayer();
+
+    // Right now, the only valid time to set a retransmit endpoint is before
+    // player selection has been made (since the presence or absence of a
+    // retransmit endpoint is going to determine which player is selected during
+    // setDataSource).
+    if (p != 0) return INVALID_OPERATION;
+
+    if (NULL != endpoint) {
+        Mutex::Autolock lock(mLock);
+        mRetransmitEndpoint = *endpoint;
+        mRetransmitEndpointValid = true;
+    } else {
+        Mutex::Autolock lock(mLock);
+        mRetransmitEndpointValid = false;
+    }
+
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::Client::getRetransmitEndpoint(
+        struct sockaddr_in* endpoint)
+{
+    if (NULL == endpoint)
+        return BAD_VALUE;
+
+    sp<MediaPlayer2Base> p = getPlayer();
+
+    if (p != NULL)
+        return p->getRetransmitEndpoint(endpoint);
+
+    Mutex::Autolock lock(mLock);
+    if (!mRetransmitEndpointValid)
+        return NO_INIT;
+
+    *endpoint = mRetransmitEndpoint;
+
+    return NO_ERROR;
+}
+
+void MediaPlayer2Manager::Client::notify(
+        void* cookie, int msg, int ext1, int ext2, const Parcel *obj)
+{
+    Client* client = static_cast<Client*>(cookie);
+    if (client == NULL) {
+        return;
+    }
+
+    sp<MediaPlayer2EngineClient> c;
+    sp<Client> nextClient;
+    status_t errStartNext = NO_ERROR;
+    {
+        Mutex::Autolock l(client->mLock);
+        c = client->mClient;
+        if (msg == MEDIA2_PLAYBACK_COMPLETE && client->mNextClient != NULL) {
+            nextClient = client->mNextClient;
+
+            if (client->mAudioOutput != NULL)
+                client->mAudioOutput->switchToNextOutput();
+
+            errStartNext = nextClient->start();
+        }
+    }
+
+    if (nextClient != NULL) {
+        sp<MediaPlayer2EngineClient> nc;
+        {
+            Mutex::Autolock l(nextClient->mLock);
+            nc = nextClient->mClient;
+        }
+        if (nc != NULL) {
+            if (errStartNext == NO_ERROR) {
+                nc->notify(MEDIA2_INFO, MEDIA2_INFO_STARTED_AS_NEXT, 0, obj);
+            } else {
+                nc->notify(MEDIA2_ERROR, MEDIA2_ERROR_UNKNOWN , 0, obj);
+                ALOGE("gapless:start playback for next track failed, err(%d)", errStartNext);
+            }
+        }
+    }
+
+    if (MEDIA2_INFO == msg &&
+        MEDIA2_INFO_METADATA_UPDATE == ext1) {
+        const media::Metadata::Type metadata_type = ext2;
+
+        if(client->shouldDropMetadata(metadata_type)) {
+            return;
+        }
+
+        // Update the list of metadata that have changed. getMetadata
+        // also access mMetadataUpdated and clears it.
+        client->addNewMetadataUpdate(metadata_type);
+    }
+
+    if (c != NULL) {
+        ALOGV("[%d] notify (%p, %d, %d, %d)", client->mConnId, cookie, msg, ext1, ext2);
+        c->notify(msg, ext1, ext2, obj);
+    }
+}
+
+
+bool MediaPlayer2Manager::Client::shouldDropMetadata(media::Metadata::Type code) const
+{
+    Mutex::Autolock lock(mLock);
+
+    if (findMetadata(mMetadataDrop, code)) {
+        return true;
+    }
+
+    if (mMetadataAllow.isEmpty() || findMetadata(mMetadataAllow, code)) {
+        return false;
+    } else {
+        return true;
+    }
+}
+
+
+void MediaPlayer2Manager::Client::addNewMetadataUpdate(media::Metadata::Type metadata_type) {
+    Mutex::Autolock lock(mLock);
+    if (mMetadataUpdated.indexOf(metadata_type) < 0) {
+        mMetadataUpdated.add(metadata_type);
+    }
+}
+
+// Modular DRM
+status_t MediaPlayer2Manager::Client::prepareDrm(const uint8_t uuid[16],
+        const Vector<uint8_t>& drmSessionId)
+{
+    ALOGV("[%d] prepareDrm", mConnId);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+
+    status_t ret = p->prepareDrm(uuid, drmSessionId);
+    ALOGV("prepareDrm ret: %d", ret);
+
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::releaseDrm()
+{
+    ALOGV("[%d] releaseDrm", mConnId);
+    sp<MediaPlayer2Base> p = getPlayer();
+    if (p == 0) return UNKNOWN_ERROR;
+
+    status_t ret = p->releaseDrm();
+    ALOGV("releaseDrm ret: %d", ret);
+
+    return ret;
+}
+
+status_t MediaPlayer2Manager::Client::setOutputDevice(audio_port_handle_t deviceId)
+{
+    ALOGV("[%d] setOutputDevice", mConnId);
+    {
+        Mutex::Autolock l(mLock);
+        if (mAudioOutput.get() != nullptr) {
+            return mAudioOutput->setOutputDevice(deviceId);
+        }
+    }
+    return NO_INIT;
+}
+
+status_t MediaPlayer2Manager::Client::getRoutedDeviceId(audio_port_handle_t* deviceId)
+{
+    ALOGV("[%d] getRoutedDeviceId", mConnId);
+    {
+        Mutex::Autolock l(mLock);
+        if (mAudioOutput.get() != nullptr) {
+            return mAudioOutput->getRoutedDeviceId(deviceId);
+        }
+    }
+    return NO_INIT;
+}
+
+status_t MediaPlayer2Manager::Client::enableAudioDeviceCallback(bool enabled)
+{
+    ALOGV("[%d] enableAudioDeviceCallback, %d", mConnId, enabled);
+    {
+        Mutex::Autolock l(mLock);
+        if (mAudioOutput.get() != nullptr) {
+            return mAudioOutput->enableAudioDeviceCallback(enabled);
+        }
+    }
+    return NO_INIT;
+}
+
+#if CALLBACK_ANTAGONIZER
+const int Antagonizer::interval = 10000; // 10 msecs
+
+Antagonizer::Antagonizer(notify_callback_f cb, void* client) :
+    mExit(false), mActive(false), mClient(client), mCb(cb)
+{
+    createThread(callbackThread, this);
+}
+
+void Antagonizer::kill()
+{
+    Mutex::Autolock _l(mLock);
+    mActive = false;
+    mExit = true;
+    mCondition.wait(mLock);
+}
+
+int Antagonizer::callbackThread(void* user)
+{
+    ALOGD("Antagonizer started");
+    Antagonizer* p = reinterpret_cast<Antagonizer*>(user);
+    while (!p->mExit) {
+        if (p->mActive) {
+            ALOGV("send event");
+            p->mCb(p->mClient, 0, 0, 0);
+        }
+        usleep(interval);
+    }
+    Mutex::Autolock _l(p->mLock);
+    p->mCondition.signal();
+    ALOGD("Antagonizer stopped");
+    return 0;
+}
+#endif
+
+#undef LOG_TAG
+#define LOG_TAG "AudioSink"
+MediaPlayer2Manager::AudioOutput::AudioOutput(audio_session_t sessionId, uid_t uid, int pid,
+        const audio_attributes_t* attr, const sp<AudioSystem::AudioDeviceCallback>& deviceCallback)
+    : mCallback(NULL),
+      mCallbackCookie(NULL),
+      mCallbackData(NULL),
+      mStreamType(AUDIO_STREAM_MUSIC),
+      mLeftVolume(1.0),
+      mRightVolume(1.0),
+      mPlaybackRate(AUDIO_PLAYBACK_RATE_DEFAULT),
+      mSampleRateHz(0),
+      mMsecsPerFrame(0),
+      mFrameSize(0),
+      mSessionId(sessionId),
+      mUid(uid),
+      mPid(pid),
+      mSendLevel(0.0),
+      mAuxEffectId(0),
+      mFlags(AUDIO_OUTPUT_FLAG_NONE),
+      mVolumeHandler(new media::VolumeHandler()),
+      mSelectedDeviceId(AUDIO_PORT_HANDLE_NONE),
+      mRoutedDeviceId(AUDIO_PORT_HANDLE_NONE),
+      mDeviceCallbackEnabled(false),
+      mDeviceCallback(deviceCallback)
+{
+    ALOGV("AudioOutput(%d)", sessionId);
+    if (attr != NULL) {
+        mAttributes = (audio_attributes_t *) calloc(1, sizeof(audio_attributes_t));
+        if (mAttributes != NULL) {
+            memcpy(mAttributes, attr, sizeof(audio_attributes_t));
+            mStreamType = audio_attributes_to_stream_type(attr);
+        }
+    } else {
+        mAttributes = NULL;
+    }
+
+    setMinBufferCount();
+}
+
+MediaPlayer2Manager::AudioOutput::~AudioOutput()
+{
+    close();
+    free(mAttributes);
+    delete mCallbackData;
+}
+
+//static
+void MediaPlayer2Manager::AudioOutput::setMinBufferCount()
+{
+    char value[PROPERTY_VALUE_MAX];
+    if (property_get("ro.kernel.qemu", value, 0)) {
+        mIsOnEmulator = true;
+        mMinBufferCount = 12;  // to prevent systematic buffer underrun for emulator
+    }
+}
+
+// static
+bool MediaPlayer2Manager::AudioOutput::isOnEmulator()
+{
+    setMinBufferCount(); // benign race wrt other threads
+    return mIsOnEmulator;
+}
+
+// static
+int MediaPlayer2Manager::AudioOutput::getMinBufferCount()
+{
+    setMinBufferCount(); // benign race wrt other threads
+    return mMinBufferCount;
+}
+
+ssize_t MediaPlayer2Manager::AudioOutput::bufferSize() const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    return mTrack->frameCount() * mFrameSize;
+}
+
+ssize_t MediaPlayer2Manager::AudioOutput::frameCount() const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    return mTrack->frameCount();
+}
+
+ssize_t MediaPlayer2Manager::AudioOutput::channelCount() const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    return mTrack->channelCount();
+}
+
+ssize_t MediaPlayer2Manager::AudioOutput::frameSize() const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    return mFrameSize;
+}
+
+uint32_t MediaPlayer2Manager::AudioOutput::latency () const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return 0;
+    return mTrack->latency();
+}
+
+float MediaPlayer2Manager::AudioOutput::msecsPerFrame() const
+{
+    Mutex::Autolock lock(mLock);
+    return mMsecsPerFrame;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::getPosition(uint32_t *position) const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    return mTrack->getPosition(position);
+}
+
+status_t MediaPlayer2Manager::AudioOutput::getTimestamp(AudioTimestamp &ts) const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    return mTrack->getTimestamp(ts);
+}
+
+// TODO: Remove unnecessary calls to getPlayedOutDurationUs()
+// as it acquires locks and may query the audio driver.
+//
+// Some calls could conceivably retrieve extrapolated data instead of
+// accessing getTimestamp() or getPosition() every time a data buffer with
+// a media time is received.
+//
+// Calculate duration of played samples if played at normal rate (i.e., 1.0).
+int64_t MediaPlayer2Manager::AudioOutput::getPlayedOutDurationUs(int64_t nowUs) const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0 || mSampleRateHz == 0) {
+        return 0;
+    }
+
+    uint32_t numFramesPlayed;
+    int64_t numFramesPlayedAtUs;
+    AudioTimestamp ts;
+
+    status_t res = mTrack->getTimestamp(ts);
+    if (res == OK) {                 // case 1: mixing audio tracks and offloaded tracks.
+        numFramesPlayed = ts.mPosition;
+        numFramesPlayedAtUs = ts.mTime.tv_sec * 1000000LL + ts.mTime.tv_nsec / 1000;
+        //ALOGD("getTimestamp: OK %d %lld", numFramesPlayed, (long long)numFramesPlayedAtUs);
+    } else if (res == WOULD_BLOCK) { // case 2: transitory state on start of a new track
+        numFramesPlayed = 0;
+        numFramesPlayedAtUs = nowUs;
+        //ALOGD("getTimestamp: WOULD_BLOCK %d %lld",
+        //        numFramesPlayed, (long long)numFramesPlayedAtUs);
+    } else {                         // case 3: transitory at new track or audio fast tracks.
+        res = mTrack->getPosition(&numFramesPlayed);
+        CHECK_EQ(res, (status_t)OK);
+        numFramesPlayedAtUs = nowUs;
+        numFramesPlayedAtUs += 1000LL * mTrack->latency() / 2; /* XXX */
+        //ALOGD("getPosition: %u %lld", numFramesPlayed, (long long)numFramesPlayedAtUs);
+    }
+
+    // CHECK_EQ(numFramesPlayed & (1 << 31), 0);  // can't be negative until 12.4 hrs, test
+    // TODO: remove the (int32_t) casting below as it may overflow at 12.4 hours.
+    int64_t durationUs = (int64_t)((int32_t)numFramesPlayed * 1000000LL / mSampleRateHz)
+            + nowUs - numFramesPlayedAtUs;
+    if (durationUs < 0) {
+        // Occurs when numFramesPlayed position is very small and the following:
+        // (1) In case 1, the time nowUs is computed before getTimestamp() is called and
+        //     numFramesPlayedAtUs is greater than nowUs by time more than numFramesPlayed.
+        // (2) In case 3, using getPosition and adding mAudioSink->latency() to
+        //     numFramesPlayedAtUs, by a time amount greater than numFramesPlayed.
+        //
+        // Both of these are transitory conditions.
+        ALOGV("getPlayedOutDurationUs: negative duration %lld set to zero", (long long)durationUs);
+        durationUs = 0;
+    }
+    ALOGV("getPlayedOutDurationUs(%lld) nowUs(%lld) frames(%u) framesAt(%lld)",
+            (long long)durationUs, (long long)nowUs,
+            numFramesPlayed, (long long)numFramesPlayedAtUs);
+    return durationUs;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::getFramesWritten(uint32_t *frameswritten) const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    ExtendedTimestamp ets;
+    status_t status = mTrack->getTimestamp(&ets);
+    if (status == OK || status == WOULD_BLOCK) {
+        *frameswritten = (uint32_t)ets.mPosition[ExtendedTimestamp::LOCATION_CLIENT];
+    }
+    return status;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::setParameters(const String8& keyValuePairs)
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return NO_INIT;
+    return mTrack->setParameters(keyValuePairs);
+}
+
+String8  MediaPlayer2Manager::AudioOutput::getParameters(const String8& keys)
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return String8::empty();
+    return mTrack->getParameters(keys);
+}
+
+void MediaPlayer2Manager::AudioOutput::setAudioAttributes(const audio_attributes_t * attributes) {
+    Mutex::Autolock lock(mLock);
+    if (attributes == NULL) {
+        free(mAttributes);
+        mAttributes = NULL;
+    } else {
+        if (mAttributes == NULL) {
+            mAttributes = (audio_attributes_t *) calloc(1, sizeof(audio_attributes_t));
+        }
+        memcpy(mAttributes, attributes, sizeof(audio_attributes_t));
+        mStreamType = audio_attributes_to_stream_type(attributes);
+    }
+}
+
+void MediaPlayer2Manager::AudioOutput::setAudioStreamType(audio_stream_type_t streamType)
+{
+    Mutex::Autolock lock(mLock);
+    // do not allow direct stream type modification if attributes have been set
+    if (mAttributes == NULL) {
+        mStreamType = streamType;
+    }
+}
+
+void MediaPlayer2Manager::AudioOutput::deleteRecycledTrack_l()
+{
+    ALOGV("deleteRecycledTrack_l");
+    if (mRecycledTrack != 0) {
+
+        if (mCallbackData != NULL) {
+            mCallbackData->setOutput(NULL);
+            mCallbackData->endTrackSwitch();
+        }
+
+        if ((mRecycledTrack->getFlags() & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) == 0) {
+            int32_t msec = 0;
+            if (!mRecycledTrack->stopped()) { // check if active
+                 (void)mRecycledTrack->pendingDuration(&msec);
+            }
+            mRecycledTrack->stop(); // ensure full data drain
+            ALOGD("deleting recycled track, waiting for data drain (%d msec)", msec);
+            if (msec > 0) {
+                static const int32_t WAIT_LIMIT_MS = 3000;
+                if (msec > WAIT_LIMIT_MS) {
+                    msec = WAIT_LIMIT_MS;
+                }
+                usleep(msec * 1000LL);
+            }
+        }
+        // An offloaded track isn't flushed because the STREAM_END is reported
+        // slightly prematurely to allow time for the gapless track switch
+        // but this means that if we decide not to recycle the track there
+        // could be a small amount of residual data still playing. We leave
+        // AudioFlinger to drain the track.
+
+        mRecycledTrack.clear();
+        close_l();
+        delete mCallbackData;
+        mCallbackData = NULL;
+    }
+}
+
+void MediaPlayer2Manager::AudioOutput::close_l()
+{
+    mTrack.clear();
+}
+
+status_t MediaPlayer2Manager::AudioOutput::open(
+        uint32_t sampleRate, int channelCount, audio_channel_mask_t channelMask,
+        audio_format_t format, int bufferCount,
+        AudioCallback cb, void *cookie,
+        audio_output_flags_t flags,
+        const audio_offload_info_t *offloadInfo,
+        bool doNotReconnect,
+        uint32_t suggestedFrameCount)
+{
+    ALOGV("open(%u, %d, 0x%x, 0x%x, %d, %d 0x%x)", sampleRate, channelCount, channelMask,
+                format, bufferCount, mSessionId, flags);
+
+    // offloading is only supported in callback mode for now.
+    // offloadInfo must be present if offload flag is set
+    if (((flags & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) != 0) &&
+            ((cb == NULL) || (offloadInfo == NULL))) {
+        return BAD_VALUE;
+    }
+
+    // compute frame count for the AudioTrack internal buffer
+    size_t frameCount;
+    if ((flags & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) != 0) {
+        frameCount = 0; // AudioTrack will get frame count from AudioFlinger
+    } else {
+        // try to estimate the buffer processing fetch size from AudioFlinger.
+        // framesPerBuffer is approximate and generally correct, except when it's not :-).
+        uint32_t afSampleRate;
+        size_t afFrameCount;
+        if (AudioSystem::getOutputFrameCount(&afFrameCount, mStreamType) != NO_ERROR) {
+            return NO_INIT;
+        }
+        if (AudioSystem::getOutputSamplingRate(&afSampleRate, mStreamType) != NO_ERROR) {
+            return NO_INIT;
+        }
+        const size_t framesPerBuffer =
+                (unsigned long long)sampleRate * afFrameCount / afSampleRate;
+
+        if (bufferCount == 0) {
+            // use suggestedFrameCount
+            bufferCount = (suggestedFrameCount + framesPerBuffer - 1) / framesPerBuffer;
+        }
+        // Check argument bufferCount against the mininum buffer count
+        if (bufferCount != 0 && bufferCount < mMinBufferCount) {
+            ALOGV("bufferCount (%d) increased to %d", bufferCount, mMinBufferCount);
+            bufferCount = mMinBufferCount;
+        }
+        // if frameCount is 0, then AudioTrack will get frame count from AudioFlinger
+        // which will be the minimum size permitted.
+        frameCount = bufferCount * framesPerBuffer;
+    }
+
+    if (channelMask == CHANNEL_MASK_USE_CHANNEL_ORDER) {
+        channelMask = audio_channel_out_mask_from_count(channelCount);
+        if (0 == channelMask) {
+            ALOGE("open() error, can\'t derive mask for %d audio channels", channelCount);
+            return NO_INIT;
+        }
+    }
+
+    Mutex::Autolock lock(mLock);
+    mCallback = cb;
+    mCallbackCookie = cookie;
+
+    // Check whether we can recycle the track
+    bool reuse = false;
+    bool bothOffloaded = false;
+
+    if (mRecycledTrack != 0) {
+        // check whether we are switching between two offloaded tracks
+        bothOffloaded = (flags & mRecycledTrack->getFlags()
+                                & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) != 0;
+
+        // check if the existing track can be reused as-is, or if a new track needs to be created.
+        reuse = true;
+
+        if ((mCallbackData == NULL && mCallback != NULL) ||
+                (mCallbackData != NULL && mCallback == NULL)) {
+            // recycled track uses callbacks but the caller wants to use writes, or vice versa
+            ALOGV("can't chain callback and write");
+            reuse = false;
+        } else if ((mRecycledTrack->getSampleRate() != sampleRate) ||
+                (mRecycledTrack->channelCount() != (uint32_t)channelCount) ) {
+            ALOGV("samplerate, channelcount differ: %u/%u Hz, %u/%d ch",
+                  mRecycledTrack->getSampleRate(), sampleRate,
+                  mRecycledTrack->channelCount(), channelCount);
+            reuse = false;
+        } else if (flags != mFlags) {
+            ALOGV("output flags differ %08x/%08x", flags, mFlags);
+            reuse = false;
+        } else if (mRecycledTrack->format() != format) {
+            reuse = false;
+        }
+    } else {
+        ALOGV("no track available to recycle");
+    }
+
+    ALOGV_IF(bothOffloaded, "both tracks offloaded");
+
+    // If we can't recycle and both tracks are offloaded
+    // we must close the previous output before opening a new one
+    if (bothOffloaded && !reuse) {
+        ALOGV("both offloaded and not recycling");
+        deleteRecycledTrack_l();
+    }
+
+    sp<AudioTrack> t;
+    CallbackData *newcbd = NULL;
+
+    // We don't attempt to create a new track if we are recycling an
+    // offloaded track. But, if we are recycling a non-offloaded or we
+    // are switching where one is offloaded and one isn't then we create
+    // the new track in advance so that we can read additional stream info
+
+    if (!(reuse && bothOffloaded)) {
+        ALOGV("creating new AudioTrack");
+
+        if (mCallback != NULL) {
+            newcbd = new CallbackData(this);
+            t = new AudioTrack(
+                    mStreamType,
+                    sampleRate,
+                    format,
+                    channelMask,
+                    frameCount,
+                    flags,
+                    CallbackWrapper,
+                    newcbd,
+                    0,  // notification frames
+                    mSessionId,
+                    AudioTrack::TRANSFER_CALLBACK,
+                    offloadInfo,
+                    mUid,
+                    mPid,
+                    mAttributes,
+                    doNotReconnect,
+                    1.0f,  // default value for maxRequiredSpeed
+                    mSelectedDeviceId);
+        } else {
+            // TODO: Due to buffer memory concerns, we use a max target playback speed
+            // based on mPlaybackRate at the time of open (instead of kMaxRequiredSpeed),
+            // also clamping the target speed to 1.0 <= targetSpeed <= kMaxRequiredSpeed.
+            const float targetSpeed =
+                    std::min(std::max(mPlaybackRate.mSpeed, 1.0f), kMaxRequiredSpeed);
+            ALOGW_IF(targetSpeed != mPlaybackRate.mSpeed,
+                    "track target speed:%f clamped from playback speed:%f",
+                    targetSpeed, mPlaybackRate.mSpeed);
+            t = new AudioTrack(
+                    mStreamType,
+                    sampleRate,
+                    format,
+                    channelMask,
+                    frameCount,
+                    flags,
+                    NULL, // callback
+                    NULL, // user data
+                    0, // notification frames
+                    mSessionId,
+                    AudioTrack::TRANSFER_DEFAULT,
+                    NULL, // offload info
+                    mUid,
+                    mPid,
+                    mAttributes,
+                    doNotReconnect,
+                    targetSpeed,
+                    mSelectedDeviceId);
+        }
+
+        if ((t == 0) || (t->initCheck() != NO_ERROR)) {
+            ALOGE("Unable to create audio track");
+            delete newcbd;
+            // t goes out of scope, so reference count drops to zero
+            return NO_INIT;
+        } else {
+            // successful AudioTrack initialization implies a legacy stream type was generated
+            // from the audio attributes
+            mStreamType = t->streamType();
+        }
+    }
+
+    if (reuse) {
+        CHECK(mRecycledTrack != NULL);
+
+        if (!bothOffloaded) {
+            if (mRecycledTrack->frameCount() != t->frameCount()) {
+                ALOGV("framecount differs: %zu/%zu frames",
+                      mRecycledTrack->frameCount(), t->frameCount());
+                reuse = false;
+            }
+        }
+
+        if (reuse) {
+            ALOGV("chaining to next output and recycling track");
+            close_l();
+            mTrack = mRecycledTrack;
+            mRecycledTrack.clear();
+            if (mCallbackData != NULL) {
+                mCallbackData->setOutput(this);
+            }
+            delete newcbd;
+            return updateTrack();
+        }
+    }
+
+    // we're not going to reuse the track, unblock and flush it
+    // this was done earlier if both tracks are offloaded
+    if (!bothOffloaded) {
+        deleteRecycledTrack_l();
+    }
+
+    CHECK((t != NULL) && ((mCallback == NULL) || (newcbd != NULL)));
+
+    mCallbackData = newcbd;
+    ALOGV("setVolume");
+    t->setVolume(mLeftVolume, mRightVolume);
+
+    // Restore VolumeShapers for the MediaPlayer2 in case the track was recreated
+    // due to an output sink error (e.g. offload to non-offload switch).
+    mVolumeHandler->forall([&t](const VolumeShaper &shaper) -> VolumeShaper::Status {
+        sp<VolumeShaper::Operation> operationToEnd =
+                new VolumeShaper::Operation(shaper.mOperation);
+        // TODO: Ideally we would restore to the exact xOffset position
+        // as returned by getVolumeShaperState(), but we don't have that
+        // information when restoring at the client unless we periodically poll
+        // the server or create shared memory state.
+        //
+        // For now, we simply advance to the end of the VolumeShaper effect
+        // if it has been started.
+        if (shaper.isStarted()) {
+            operationToEnd->setNormalizedTime(1.f);
+        }
+        return t->applyVolumeShaper(shaper.mConfiguration, operationToEnd);
+    });
+
+    mSampleRateHz = sampleRate;
+    mFlags = flags;
+    mMsecsPerFrame = 1E3f / (mPlaybackRate.mSpeed * sampleRate);
+    mFrameSize = t->frameSize();
+    mTrack = t;
+
+    return updateTrack();
+}
+
+status_t MediaPlayer2Manager::AudioOutput::updateTrack() {
+    if (mTrack == NULL) {
+        return NO_ERROR;
+    }
+
+    status_t res = NO_ERROR;
+    // Note some output devices may give us a direct track even though we don't specify it.
+    // Example: Line application b/17459982.
+    if ((mTrack->getFlags()
+            & (AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD | AUDIO_OUTPUT_FLAG_DIRECT)) == 0) {
+        res = mTrack->setPlaybackRate(mPlaybackRate);
+        if (res == NO_ERROR) {
+            mTrack->setAuxEffectSendLevel(mSendLevel);
+            res = mTrack->attachAuxEffect(mAuxEffectId);
+        }
+    }
+    mTrack->setOutputDevice(mSelectedDeviceId);
+    if (mDeviceCallbackEnabled) {
+        mTrack->addAudioDeviceCallback(mDeviceCallback.promote());
+    }
+    ALOGV("updateTrack() DONE status %d", res);
+    return res;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::start()
+{
+    ALOGV("start");
+    Mutex::Autolock lock(mLock);
+    if (mCallbackData != NULL) {
+        mCallbackData->endTrackSwitch();
+    }
+    if (mTrack != 0) {
+        mTrack->setVolume(mLeftVolume, mRightVolume);
+        mTrack->setAuxEffectSendLevel(mSendLevel);
+        status_t status = mTrack->start();
+        if (status == NO_ERROR) {
+            mVolumeHandler->setStarted();
+        }
+        return status;
+    }
+    return NO_INIT;
+}
+
+void MediaPlayer2Manager::AudioOutput::setNextOutput(const sp<AudioOutput>& nextOutput) {
+    Mutex::Autolock lock(mLock);
+    mNextOutput = nextOutput;
+}
+
+void MediaPlayer2Manager::AudioOutput::switchToNextOutput() {
+    ALOGV("switchToNextOutput");
+
+    // Try to acquire the callback lock before moving track (without incurring deadlock).
+    const unsigned kMaxSwitchTries = 100;
+    Mutex::Autolock lock(mLock);
+    for (unsigned tries = 0;;) {
+        if (mTrack == 0) {
+            return;
+        }
+        if (mNextOutput != NULL && mNextOutput != this) {
+            if (mCallbackData != NULL) {
+                // two alternative approaches
+#if 1
+                CallbackData *callbackData = mCallbackData;
+                mLock.unlock();
+                // proper acquisition sequence
+                callbackData->lock();
+                mLock.lock();
+                // Caution: it is unlikely that someone deleted our callback or changed our target
+                if (callbackData != mCallbackData || mNextOutput == NULL || mNextOutput == this) {
+                    // fatal if we are starved out.
+                    LOG_ALWAYS_FATAL_IF(++tries > kMaxSwitchTries,
+                            "switchToNextOutput() cannot obtain correct lock sequence");
+                    callbackData->unlock();
+                    continue;
+                }
+                callbackData->mSwitching = true; // begin track switch
+                callbackData->setOutput(NULL);
+#else
+                // tryBeginTrackSwitch() returns false if the callback has the lock.
+                if (!mCallbackData->tryBeginTrackSwitch()) {
+                    // fatal if we are starved out.
+                    LOG_ALWAYS_FATAL_IF(++tries > kMaxSwitchTries,
+                            "switchToNextOutput() cannot obtain callback lock");
+                    mLock.unlock();
+                    usleep(5 * 1000 /* usec */); // allow callback to use AudioOutput
+                    mLock.lock();
+                    continue;
+                }
+#endif
+            }
+
+            Mutex::Autolock nextLock(mNextOutput->mLock);
+
+            // If the next output track is not NULL, then it has been
+            // opened already for playback.
+            // This is possible even without the next player being started,
+            // for example, the next player could be prepared and seeked.
+            //
+            // Presuming it isn't advisable to force the track over.
+             if (mNextOutput->mTrack == NULL) {
+                ALOGD("Recycling track for gapless playback");
+                delete mNextOutput->mCallbackData;
+                mNextOutput->mCallbackData = mCallbackData;
+                mNextOutput->mRecycledTrack = mTrack;
+                mNextOutput->mSampleRateHz = mSampleRateHz;
+                mNextOutput->mMsecsPerFrame = mMsecsPerFrame;
+                mNextOutput->mFlags = mFlags;
+                mNextOutput->mFrameSize = mFrameSize;
+                close_l();
+                mCallbackData = NULL;  // destruction handled by mNextOutput
+            } else {
+                ALOGW("Ignoring gapless playback because next player has already started");
+                // remove track in case resource needed for future players.
+                if (mCallbackData != NULL) {
+                    mCallbackData->endTrackSwitch();  // release lock for callbacks before close.
+                }
+                close_l();
+            }
+        }
+        break;
+    }
+}
+
+ssize_t MediaPlayer2Manager::AudioOutput::write(const void* buffer, size_t size, bool blocking)
+{
+    Mutex::Autolock lock(mLock);
+    LOG_ALWAYS_FATAL_IF(mCallback != NULL, "Don't call write if supplying a callback.");
+
+    //ALOGV("write(%p, %u)", buffer, size);
+    if (mTrack != 0) {
+        return mTrack->write(buffer, size, blocking);
+    }
+    return NO_INIT;
+}
+
+void MediaPlayer2Manager::AudioOutput::stop()
+{
+    ALOGV("stop");
+    Mutex::Autolock lock(mLock);
+    if (mTrack != 0) mTrack->stop();
+}
+
+void MediaPlayer2Manager::AudioOutput::flush()
+{
+    ALOGV("flush");
+    Mutex::Autolock lock(mLock);
+    if (mTrack != 0) mTrack->flush();
+}
+
+void MediaPlayer2Manager::AudioOutput::pause()
+{
+    ALOGV("pause");
+    Mutex::Autolock lock(mLock);
+    if (mTrack != 0) mTrack->pause();
+}
+
+void MediaPlayer2Manager::AudioOutput::close()
+{
+    ALOGV("close");
+    sp<AudioTrack> track;
+    {
+        Mutex::Autolock lock(mLock);
+        track = mTrack;
+        close_l(); // clears mTrack
+    }
+    // destruction of the track occurs outside of mutex.
+}
+
+void MediaPlayer2Manager::AudioOutput::setVolume(float left, float right)
+{
+    ALOGV("setVolume(%f, %f)", left, right);
+    Mutex::Autolock lock(mLock);
+    mLeftVolume = left;
+    mRightVolume = right;
+    if (mTrack != 0) {
+        mTrack->setVolume(left, right);
+    }
+}
+
+status_t MediaPlayer2Manager::AudioOutput::setPlaybackRate(const AudioPlaybackRate &rate)
+{
+    ALOGV("setPlaybackRate(%f %f %d %d)",
+                rate.mSpeed, rate.mPitch, rate.mFallbackMode, rate.mStretchMode);
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) {
+        // remember rate so that we can set it when the track is opened
+        mPlaybackRate = rate;
+        return OK;
+    }
+    status_t res = mTrack->setPlaybackRate(rate);
+    if (res != NO_ERROR) {
+        return res;
+    }
+    // rate.mSpeed is always greater than 0 if setPlaybackRate succeeded
+    CHECK_GT(rate.mSpeed, 0.f);
+    mPlaybackRate = rate;
+    if (mSampleRateHz != 0) {
+        mMsecsPerFrame = 1E3f / (rate.mSpeed * mSampleRateHz);
+    }
+    return res;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::getPlaybackRate(AudioPlaybackRate *rate)
+{
+    ALOGV("setPlaybackRate");
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) {
+        return NO_INIT;
+    }
+    *rate = mTrack->getPlaybackRate();
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::setAuxEffectSendLevel(float level)
+{
+    ALOGV("setAuxEffectSendLevel(%f)", level);
+    Mutex::Autolock lock(mLock);
+    mSendLevel = level;
+    if (mTrack != 0) {
+        return mTrack->setAuxEffectSendLevel(level);
+    }
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::attachAuxEffect(int effectId)
+{
+    ALOGV("attachAuxEffect(%d)", effectId);
+    Mutex::Autolock lock(mLock);
+    mAuxEffectId = effectId;
+    if (mTrack != 0) {
+        return mTrack->attachAuxEffect(effectId);
+    }
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::setOutputDevice(audio_port_handle_t deviceId)
+{
+    ALOGV("setOutputDevice(%d)", deviceId);
+    Mutex::Autolock lock(mLock);
+    mSelectedDeviceId = deviceId;
+    if (mTrack != 0) {
+        return mTrack->setOutputDevice(deviceId);
+    }
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::getRoutedDeviceId(audio_port_handle_t* deviceId)
+{
+    ALOGV("getRoutedDeviceId");
+    Mutex::Autolock lock(mLock);
+    if (mTrack != 0) {
+        mRoutedDeviceId = mTrack->getRoutedDeviceId();
+    }
+    *deviceId = mRoutedDeviceId;
+    return NO_ERROR;
+}
+
+status_t MediaPlayer2Manager::AudioOutput::enableAudioDeviceCallback(bool enabled)
+{
+    ALOGV("enableAudioDeviceCallback, %d", enabled);
+    Mutex::Autolock lock(mLock);
+    mDeviceCallbackEnabled = enabled;
+    if (mTrack != 0) {
+        status_t status;
+        if (enabled) {
+            status = mTrack->addAudioDeviceCallback(mDeviceCallback.promote());
+        } else {
+            status = mTrack->removeAudioDeviceCallback(mDeviceCallback.promote());
+        }
+        return status;
+    }
+    return NO_ERROR;
+}
+
+VolumeShaper::Status MediaPlayer2Manager::AudioOutput::applyVolumeShaper(
+                const sp<VolumeShaper::Configuration>& configuration,
+                const sp<VolumeShaper::Operation>& operation)
+{
+    Mutex::Autolock lock(mLock);
+    ALOGV("AudioOutput::applyVolumeShaper");
+
+    mVolumeHandler->setIdIfNecessary(configuration);
+
+    VolumeShaper::Status status;
+    if (mTrack != 0) {
+        status = mTrack->applyVolumeShaper(configuration, operation);
+        if (status >= 0) {
+            (void)mVolumeHandler->applyVolumeShaper(configuration, operation);
+            if (mTrack->isPlaying()) { // match local AudioTrack to properly restore.
+                mVolumeHandler->setStarted();
+            }
+        }
+    } else {
+        // VolumeShapers are not affected when a track moves between players for
+        // gapless playback (setNextMediaPlayer).
+        // We forward VolumeShaper operations that do not change configuration
+        // to the new player so that unducking may occur as expected.
+        // Unducking is an idempotent operation, same if applied back-to-back.
+        if (configuration->getType() == VolumeShaper::Configuration::TYPE_ID
+                && mNextOutput != nullptr) {
+            ALOGV("applyVolumeShaper: Attempting to forward missed operation: %s %s",
+                    configuration->toString().c_str(), operation->toString().c_str());
+            Mutex::Autolock nextLock(mNextOutput->mLock);
+
+            // recycled track should be forwarded from this AudioSink by switchToNextOutput
+            sp<AudioTrack> track = mNextOutput->mRecycledTrack;
+            if (track != nullptr) {
+                ALOGD("Forward VolumeShaper operation to recycled track %p", track.get());
+                (void)track->applyVolumeShaper(configuration, operation);
+            } else {
+                // There is a small chance that the unduck occurs after the next
+                // player has already started, but before it is registered to receive
+                // the unduck command.
+                track = mNextOutput->mTrack;
+                if (track != nullptr) {
+                    ALOGD("Forward VolumeShaper operation to track %p", track.get());
+                    (void)track->applyVolumeShaper(configuration, operation);
+                }
+            }
+        }
+        status = mVolumeHandler->applyVolumeShaper(configuration, operation);
+    }
+    return status;
+}
+
+sp<VolumeShaper::State> MediaPlayer2Manager::AudioOutput::getVolumeShaperState(int id)
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack != 0) {
+        return mTrack->getVolumeShaperState(id);
+    } else {
+        return mVolumeHandler->getVolumeShaperState(id);
+    }
+}
+
+// static
+void MediaPlayer2Manager::AudioOutput::CallbackWrapper(
+        int event, void *cookie, void *info) {
+    //ALOGV("callbackwrapper");
+    CallbackData *data = (CallbackData*)cookie;
+    // lock to ensure we aren't caught in the middle of a track switch.
+    data->lock();
+    AudioOutput *me = data->getOutput();
+    AudioTrack::Buffer *buffer = (AudioTrack::Buffer *)info;
+    if (me == NULL) {
+        // no output set, likely because the track was scheduled to be reused
+        // by another player, but the format turned out to be incompatible.
+        data->unlock();
+        if (buffer != NULL) {
+            buffer->size = 0;
+        }
+        return;
+    }
+
+    switch(event) {
+    case AudioTrack::EVENT_MORE_DATA: {
+        size_t actualSize = (*me->mCallback)(
+                me, buffer->raw, buffer->size, me->mCallbackCookie,
+                CB_EVENT_FILL_BUFFER);
+
+        // Log when no data is returned from the callback.
+        // (1) We may have no data (especially with network streaming sources).
+        // (2) We may have reached the EOS and the audio track is not stopped yet.
+        // Note that AwesomePlayer/AudioPlayer will only return zero size when it reaches the EOS.
+        // NuPlayer2Renderer will return zero when it doesn't have data (it doesn't block to fill).
+        //
+        // This is a benign busy-wait, with the next data request generated 10 ms or more later;
+        // nevertheless for power reasons, we don't want to see too many of these.
+
+        ALOGV_IF(actualSize == 0 && buffer->size > 0, "callbackwrapper: empty buffer returned");
+
+        buffer->size = actualSize;
+        } break;
+
+    case AudioTrack::EVENT_STREAM_END:
+        // currently only occurs for offloaded callbacks
+        ALOGV("callbackwrapper: deliver EVENT_STREAM_END");
+        (*me->mCallback)(me, NULL /* buffer */, 0 /* size */,
+                me->mCallbackCookie, CB_EVENT_STREAM_END);
+        break;
+
+    case AudioTrack::EVENT_NEW_IAUDIOTRACK :
+        ALOGV("callbackwrapper: deliver EVENT_TEAR_DOWN");
+        (*me->mCallback)(me,  NULL /* buffer */, 0 /* size */,
+                me->mCallbackCookie, CB_EVENT_TEAR_DOWN);
+        break;
+
+    case AudioTrack::EVENT_UNDERRUN:
+        // This occurs when there is no data available, typically
+        // when there is a failure to supply data to the AudioTrack.  It can also
+        // occur in non-offloaded mode when the audio device comes out of standby.
+        //
+        // If an AudioTrack underruns it outputs silence. Since this happens suddenly
+        // it may sound like an audible pop or glitch.
+        //
+        // The underrun event is sent once per track underrun; the condition is reset
+        // when more data is sent to the AudioTrack.
+        ALOGD("callbackwrapper: EVENT_UNDERRUN (discarded)");
+        break;
+
+    default:
+        ALOGE("received unknown event type: %d inside CallbackWrapper !", event);
+    }
+
+    data->unlock();
+}
+
+audio_session_t MediaPlayer2Manager::AudioOutput::getSessionId() const
+{
+    Mutex::Autolock lock(mLock);
+    return mSessionId;
+}
+
+uint32_t MediaPlayer2Manager::AudioOutput::getSampleRate() const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) return 0;
+    return mTrack->getSampleRate();
+}
+
+int64_t MediaPlayer2Manager::AudioOutput::getBufferDurationInUs() const
+{
+    Mutex::Autolock lock(mLock);
+    if (mTrack == 0) {
+        return 0;
+    }
+    int64_t duration;
+    if (mTrack->getBufferDurationInUs(&duration) != OK) {
+        return 0;
+    }
+    return duration;
+}
+
+} // namespace android