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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //#define USE_LOG SLAndroidLogLevel_Verbose
     18 
     19 #include "sles_allinclusive.h"
     20 
     21 #include <media/stagefright/foundation/ADebug.h>
     22 #include <sys/stat.h>
     23 
     24 namespace android {
     25 
     26 //--------------------------------------------------------------------------------------------------
     27 GenericPlayer::GenericPlayer(const AudioPlayback_Parameters* params) :
     28         mDataLocatorType(kDataLocatorNone),
     29         mNotifyClient(NULL),
     30         mNotifyUser(NULL),
     31         mStateFlags(0),
     32         mPlaybackParams(*params),
     33         mDurationMsec(ANDROID_UNKNOWN_TIME),
     34         mCacheStatus(kStatusEmpty),
     35         mCacheFill(0),
     36         mLastNotifiedCacheFill(0),
     37         mCacheFillNotifThreshold(100),
     38         mEventFlags(0),
     39         mMarkerPositionMs(ANDROID_UNKNOWN_TIME),
     40         mPositionUpdatePeriodMs(1000), // per spec
     41         mOneShotGeneration(0),
     42         mDeliveredNewPosMs(ANDROID_UNKNOWN_TIME),
     43         mObservedPositionMs(ANDROID_UNKNOWN_TIME)
     44 {
     45     SL_LOGD("GenericPlayer::GenericPlayer()");
     46 
     47     mLooper = new android::ALooper();
     48 
     49     mAndroidAudioLevels.mFinalVolume[0] = 1.0f;
     50     mAndroidAudioLevels.mFinalVolume[1] = 1.0f;
     51 }
     52 
     53 
     54 GenericPlayer::~GenericPlayer() {
     55     SL_LOGV("GenericPlayer::~GenericPlayer()");
     56 
     57     resetDataLocator();
     58 }
     59 
     60 
     61 void GenericPlayer::init(const notif_cbf_t cbf, void* notifUser) {
     62     SL_LOGD("GenericPlayer::init()");
     63 
     64     {
     65         android::Mutex::Autolock autoLock(mNotifyClientLock);
     66         mNotifyClient = cbf;
     67         mNotifyUser = notifUser;
     68     }
     69 
     70     mLooper->registerHandler(this);
     71     mLooper->start(false /*runOnCallingThread*/, false /*canCallJava*/, PRIORITY_DEFAULT);
     72 }
     73 
     74 
     75 void GenericPlayer::preDestroy() {
     76     SL_LOGD("GenericPlayer::preDestroy()");
     77     {
     78         android::Mutex::Autolock autoLock(mNotifyClientLock);
     79         mNotifyClient = NULL;
     80         mNotifyUser = NULL;
     81     }
     82 
     83     mLooper->stop();
     84     mLooper->unregisterHandler(id());
     85 }
     86 
     87 
     88 void GenericPlayer::setDataSource(const char *uri) {
     89     SL_LOGV("GenericPlayer::setDataSource(uri=%s)", uri);
     90     resetDataLocator();
     91 
     92     mDataLocator.uriRef = uri;
     93 
     94     mDataLocatorType = kDataLocatorUri;
     95 }
     96 
     97 
     98 void GenericPlayer::setDataSource(int fd, int64_t offset, int64_t length, bool closeAfterUse) {
     99     SL_LOGV("GenericPlayer::setDataSource(fd=%d, offset=%lld, length=%lld, closeAfterUse=%s)", fd,
    100             offset, length, closeAfterUse ? "true" : "false");
    101     resetDataLocator();
    102 
    103     mDataLocator.fdi.fd = fd;
    104 
    105     struct stat sb;
    106     int ret = fstat(fd, &sb);
    107     if (ret != 0) {
    108         SL_LOGE("GenericPlayer::setDataSource: fstat(%d) failed: %d, %s", fd, ret, strerror(errno));
    109         return;
    110     }
    111 
    112     if (offset >= sb.st_size) {
    113         SL_LOGE("SfPlayer::setDataSource: invalid offset");
    114         return;
    115     }
    116     mDataLocator.fdi.offset = offset;
    117 
    118     if (PLAYER_FD_FIND_FILE_SIZE == length) {
    119         mDataLocator.fdi.length = sb.st_size;
    120     } else if (offset + length > sb.st_size) {
    121         mDataLocator.fdi.length = sb.st_size - offset;
    122     } else {
    123         mDataLocator.fdi.length = length;
    124     }
    125 
    126     mDataLocator.fdi.mCloseAfterUse = closeAfterUse;
    127 
    128     mDataLocatorType = kDataLocatorFd;
    129 }
    130 
    131 
    132 void GenericPlayer::prepare() {
    133     SL_LOGD("GenericPlayer::prepare()");
    134     // do not attempt prepare more than once
    135     if (!(mStateFlags & (kFlagPrepared | kFlagPreparedUnsuccessfully))) {
    136         sp<AMessage> msg = new AMessage(kWhatPrepare, id());
    137         msg->post();
    138     }
    139 }
    140 
    141 
    142 void GenericPlayer::play() {
    143     SL_LOGD("GenericPlayer::play()");
    144     sp<AMessage> msg = new AMessage(kWhatPlay, id());
    145     msg->post();
    146 }
    147 
    148 
    149 void GenericPlayer::pause() {
    150     SL_LOGD("GenericPlayer::pause()");
    151     sp<AMessage> msg = new AMessage(kWhatPause, id());
    152     msg->post();
    153 }
    154 
    155 
    156 void GenericPlayer::stop() {
    157     SL_LOGD("GenericPlayer::stop()");
    158     (new AMessage(kWhatPause, id()))->post();
    159 
    160     // after a stop, playback should resume from the start.
    161     seek(0);
    162 }
    163 
    164 
    165 void GenericPlayer::seek(int64_t timeMsec) {
    166     SL_LOGV("GenericPlayer::seek %lld", timeMsec);
    167     if (timeMsec < 0 && timeMsec != ANDROID_UNKNOWN_TIME) {
    168         SL_LOGE("GenericPlayer::seek error, can't seek to negative time %lldms", timeMsec);
    169         return;
    170     }
    171     sp<AMessage> msg = new AMessage(kWhatSeek, id());
    172     msg->setInt64(WHATPARAM_SEEK_SEEKTIME_MS, timeMsec);
    173     msg->post();
    174 }
    175 
    176 
    177 void GenericPlayer::loop(bool loop) {
    178     SL_LOGV("GenericPlayer::loop %s", loop ? "true" : "false");
    179     sp<AMessage> msg = new AMessage(kWhatLoop, id());
    180     msg->setInt32(WHATPARAM_LOOP_LOOPING, (int32_t)loop);
    181     msg->post();
    182 }
    183 
    184 
    185 void GenericPlayer::setBufferingUpdateThreshold(int16_t thresholdPercent) {
    186     SL_LOGV("GenericPlayer::setBufferingUpdateThreshold %d", thresholdPercent);
    187     sp<AMessage> msg = new AMessage(kWhatBuffUpdateThres, id());
    188     msg->setInt32(WHATPARAM_BUFFERING_UPDATETHRESHOLD_PERCENT, (int32_t)thresholdPercent);
    189     msg->post();
    190 }
    191 
    192 
    193 //--------------------------------------------------
    194 void GenericPlayer::getDurationMsec(int* msec) {
    195     *msec = mDurationMsec;
    196 }
    197 
    198 //--------------------------------------------------
    199 void GenericPlayer::setVolume(float leftVol, float rightVol)
    200 {
    201     {
    202         Mutex::Autolock _l(mSettingsLock);
    203         mAndroidAudioLevels.mFinalVolume[0] = leftVol;
    204         mAndroidAudioLevels.mFinalVolume[1] = rightVol;
    205     }
    206     // send a message for the volume to be updated by the object which implements the volume
    207     (new AMessage(kWhatVolumeUpdate, id()))->post();
    208 }
    209 
    210 
    211 //--------------------------------------------------
    212 void GenericPlayer::attachAuxEffect(int32_t effectId)
    213 {
    214     SL_LOGV("GenericPlayer::attachAuxEffect(id=%d)", effectId);
    215     sp<AMessage> msg = new AMessage(kWhatAttachAuxEffect, id());
    216     msg->setInt32(WHATPARAM_ATTACHAUXEFFECT, effectId);
    217     msg->post();
    218 }
    219 
    220 
    221 //--------------------------------------------------
    222 void GenericPlayer::setAuxEffectSendLevel(float level)
    223 {
    224     SL_LOGV("GenericPlayer::setAuxEffectSendLevel(level=%g)", level);
    225     sp<AMessage> msg = new AMessage(kWhatSetAuxEffectSendLevel, id());
    226     msg->setFloat(WHATPARAM_SETAUXEFFECTSENDLEVEL, level);
    227     msg->post();
    228 }
    229 
    230 
    231 //--------------------------------------------------
    232 // Call after changing any of the IPlay settings related to SL_PLAYEVENT_*
    233 void GenericPlayer::setPlayEvents(int32_t eventFlags, int32_t markerPositionMs,
    234         int32_t positionUpdatePeriodMs)
    235 {
    236     // Normalize ms that are within the valid unsigned range, but not in the int32_t range
    237     if (markerPositionMs < 0) {
    238         markerPositionMs = ANDROID_UNKNOWN_TIME;
    239     }
    240     if (positionUpdatePeriodMs < 0) {
    241         positionUpdatePeriodMs = ANDROID_UNKNOWN_TIME;
    242     }
    243     // markers are delivered accurately, but new position updates are limited to every 100 ms
    244     if (positionUpdatePeriodMs < 100) {
    245         positionUpdatePeriodMs = 100;
    246     }
    247     sp<AMessage> msg = new AMessage(kWhatSetPlayEvents, id());
    248     msg->setInt32(WHATPARAM_SETPLAYEVENTS_FLAGS, eventFlags);
    249     msg->setInt32(WHATPARAM_SETPLAYEVENTS_MARKER, markerPositionMs);
    250     msg->setInt32(WHATPARAM_SETPLAYEVENTS_UPDATE, positionUpdatePeriodMs);
    251     msg->post();
    252 }
    253 
    254 
    255 //--------------------------------------------------
    256 /*
    257  * post-condition: mDataLocatorType == kDataLocatorNone
    258  *
    259  */
    260 void GenericPlayer::resetDataLocator() {
    261     SL_LOGV("GenericPlayer::resetDataLocator()");
    262     if (mDataLocatorType == kDataLocatorFd && mDataLocator.fdi.mCloseAfterUse) {
    263         (void) ::close(mDataLocator.fdi.fd);
    264         // would be redundant, as we're about to invalidate the union mDataLocator
    265         //mDataLocator.fdi.fd = -1;
    266         //mDataLocator.fdi.mCloseAfterUse = false;
    267     }
    268     mDataLocatorType = kDataLocatorNone;
    269 }
    270 
    271 
    272 void GenericPlayer::notify(const char* event, int data, bool async) {
    273     SL_LOGV("GenericPlayer::notify(event=%s, data=%d, async=%s)", event, data,
    274             async ? "true" : "false");
    275     sp<AMessage> msg = new AMessage(kWhatNotif, id());
    276     msg->setInt32(event, (int32_t)data);
    277     if (async) {
    278         msg->post();
    279     } else {
    280         this->onNotify(msg);
    281     }
    282 }
    283 
    284 
    285 void GenericPlayer::notify(const char* event, int data1, int data2, bool async) {
    286     SL_LOGV("GenericPlayer::notify(event=%s, data1=%d, data2=%d, async=%s)", event, data1, data2,
    287             async ? "true" : "false");
    288     sp<AMessage> msg = new AMessage(kWhatNotif, id());
    289     msg->setRect(event, 0, 0, (int32_t)data1, (int32_t)data2);
    290     if (async) {
    291         msg->post();
    292     } else {
    293         this->onNotify(msg);
    294     }
    295 }
    296 
    297 
    298 //--------------------------------------------------
    299 // AHandler implementation
    300 void GenericPlayer::onMessageReceived(const sp<AMessage> &msg) {
    301     SL_LOGV("GenericPlayer::onMessageReceived()");
    302     switch (msg->what()) {
    303         case kWhatPrepare:
    304             SL_LOGV("kWhatPrepare");
    305             onPrepare();
    306             break;
    307 
    308         case kWhatNotif:
    309             SL_LOGV("kWhatNotif");
    310             onNotify(msg);
    311             break;
    312 
    313         case kWhatPlay:
    314             SL_LOGV("kWhatPlay");
    315             onPlay();
    316             break;
    317 
    318         case kWhatPause:
    319             SL_LOGV("kWhatPause");
    320             onPause();
    321             break;
    322 
    323         case kWhatSeek:
    324             SL_LOGV("kWhatSeek");
    325             onSeek(msg);
    326             break;
    327 
    328         case kWhatLoop:
    329             SL_LOGV("kWhatLoop");
    330             onLoop(msg);
    331             break;
    332 
    333         case kWhatVolumeUpdate:
    334             SL_LOGV("kWhatVolumeUpdate");
    335             onVolumeUpdate();
    336             break;
    337 
    338         case kWhatSeekComplete:
    339             SL_LOGV("kWhatSeekComplete");
    340             onSeekComplete();
    341             break;
    342 
    343         case kWhatBufferingUpdate:
    344             SL_LOGV("kWhatBufferingUpdate");
    345             onBufferingUpdate(msg);
    346             break;
    347 
    348         case kWhatBuffUpdateThres:
    349             SL_LOGV("kWhatBuffUpdateThres");
    350             onSetBufferingUpdateThreshold(msg);
    351             break;
    352 
    353         case kWhatAttachAuxEffect:
    354             SL_LOGV("kWhatAttachAuxEffect");
    355             onAttachAuxEffect(msg);
    356             break;
    357 
    358         case kWhatSetAuxEffectSendLevel:
    359             SL_LOGV("kWhatSetAuxEffectSendLevel");
    360             onSetAuxEffectSendLevel(msg);
    361             break;
    362 
    363         case kWhatSetPlayEvents:
    364             SL_LOGV("kWhatSetPlayEvents");
    365             onSetPlayEvents(msg);
    366             break;
    367 
    368         case kWhatOneShot:
    369             SL_LOGV("kWhatOneShot");
    370             onOneShot(msg);
    371             break;
    372 
    373         default:
    374             SL_LOGE("GenericPlayer::onMessageReceived unknown message %d", msg->what());
    375             TRESPASS();
    376     }
    377 }
    378 
    379 
    380 //--------------------------------------------------
    381 // Event handlers
    382 //  it is strictly verboten to call those methods outside of the event loop
    383 
    384 void GenericPlayer::onPrepare() {
    385     SL_LOGV("GenericPlayer::onPrepare()");
    386     // Subclass is responsible for indicating whether prepare was successful or unsuccessful
    387     // by updating mStateFlags accordingly.  It must set exactly one of these two flags.
    388     assert(!(mStateFlags & kFlagPrepared) != !(mStateFlags & kFlagPreparedUnsuccessfully));
    389     notify(PLAYEREVENT_PREPARED, mStateFlags & kFlagPrepared ? PLAYER_SUCCESS : PLAYER_FAILURE,
    390             true /*async*/);
    391     SL_LOGD("GenericPlayer::onPrepare() done, mStateFlags=0x%x", mStateFlags);
    392 }
    393 
    394 
    395 void GenericPlayer::onNotify(const sp<AMessage> &msg) {
    396     SL_LOGV("GenericPlayer::onNotify()");
    397     notif_cbf_t notifClient;
    398     void*       notifUser;
    399     {
    400         android::Mutex::Autolock autoLock(mNotifyClientLock);
    401         if (NULL == mNotifyClient) {
    402             return;
    403         } else {
    404             notifClient = mNotifyClient;
    405             notifUser   = mNotifyUser;
    406         }
    407     }
    408 
    409     int32_t val1, val2;
    410     if (msg->findInt32(PLAYEREVENT_PREFETCHSTATUSCHANGE, &val1)) {
    411         SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PREFETCHSTATUSCHANGE, val1);
    412         notifClient(kEventPrefetchStatusChange, val1, 0, notifUser);
    413     } else if (msg->findInt32(PLAYEREVENT_PREFETCHFILLLEVELUPDATE, &val1)) {
    414         SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PREFETCHFILLLEVELUPDATE, val1);
    415         notifClient(kEventPrefetchFillLevelUpdate, val1, 0, notifUser);
    416     } else if (msg->findInt32(PLAYEREVENT_ENDOFSTREAM, &val1)) {
    417         SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_ENDOFSTREAM, val1);
    418         notifClient(kEventEndOfStream, val1, 0, notifUser);
    419     } else if (msg->findInt32(PLAYEREVENT_PREPARED, &val1)) {
    420         SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PREPARED, val1);
    421         notifClient(kEventPrepared, val1, 0, notifUser);
    422     } else if (msg->findInt32(PLAYEREVENT_CHANNEL_COUNT, &val1)) {
    423         SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_CHANNEL_COUNT, val1);
    424         notifClient(kEventChannelCount, val1, 0, notifUser);
    425     } else if (msg->findRect(PLAYEREVENT_VIDEO_SIZE_UPDATE, &val1, &val2, &val1, &val2)) {
    426         SL_LOGV("GenericPlayer notifying %s = %d, %d", PLAYEREVENT_VIDEO_SIZE_UPDATE, val1, val2);
    427         notifClient(kEventHasVideoSize, val1, val2, notifUser);
    428     } else if (msg->findInt32(PLAYEREVENT_PLAY, &val1)) {
    429         SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PLAY, val1);
    430         notifClient(kEventPlay, val1, 0, notifUser);
    431     } else if (msg->findInt32(PLAYEREVENT_ERRORAFTERPREPARE, &val1)) {
    432         SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_ERRORAFTERPREPARE, val1);
    433         notifClient(kEventErrorAfterPrepare, val1, 0, notifUser);
    434     } else {
    435         SL_LOGV("GenericPlayer notifying unknown");
    436     }
    437 }
    438 
    439 
    440 void GenericPlayer::onPlay() {
    441     SL_LOGD("GenericPlayer::onPlay()");
    442     if ((mStateFlags & (kFlagPrepared | kFlagPlaying)) == kFlagPrepared) {
    443         SL_LOGD("starting player");
    444         mStateFlags |= kFlagPlaying;
    445         updateOneShot();
    446     }
    447 }
    448 
    449 
    450 void GenericPlayer::onPause() {
    451     SL_LOGD("GenericPlayer::onPause()");
    452     if (!(~mStateFlags & (kFlagPrepared | kFlagPlaying))) {
    453         SL_LOGV("pausing player");
    454         mStateFlags &= ~kFlagPlaying;
    455         updateOneShot();
    456     }
    457 }
    458 
    459 
    460 void GenericPlayer::onSeek(const sp<AMessage> &msg) {
    461     SL_LOGV("GenericPlayer::onSeek");
    462 }
    463 
    464 
    465 void GenericPlayer::onLoop(const sp<AMessage> &msg) {
    466     SL_LOGV("GenericPlayer::onLoop");
    467 }
    468 
    469 
    470 void GenericPlayer::onVolumeUpdate() {
    471     SL_LOGV("GenericPlayer::onVolumeUpdate");
    472 }
    473 
    474 
    475 void GenericPlayer::onSeekComplete() {
    476     SL_LOGD("GenericPlayer::onSeekComplete()");
    477     mStateFlags &= ~kFlagSeeking;
    478     // avoid spurious or lost events caused by seeking past a marker
    479     mDeliveredNewPosMs = ANDROID_UNKNOWN_TIME;
    480     mObservedPositionMs = ANDROID_UNKNOWN_TIME;
    481     updateOneShot();
    482 }
    483 
    484 
    485 void GenericPlayer::onBufferingUpdate(const sp<AMessage> &msg) {
    486     SL_LOGV("GenericPlayer::onBufferingUpdate");
    487 }
    488 
    489 
    490 void GenericPlayer::onSetBufferingUpdateThreshold(const sp<AMessage> &msg) {
    491     SL_LOGV("GenericPlayer::onSetBufferingUpdateThreshold");
    492     int32_t thresholdPercent = 0;
    493     if (msg->findInt32(WHATPARAM_BUFFERING_UPDATETHRESHOLD_PERCENT, &thresholdPercent)) {
    494         Mutex::Autolock _l(mSettingsLock);
    495         mCacheFillNotifThreshold = (int16_t)thresholdPercent;
    496     }
    497 }
    498 
    499 
    500 void GenericPlayer::onAttachAuxEffect(const sp<AMessage> &msg) {
    501     SL_LOGV("GenericPlayer::onAttachAuxEffect()");
    502 }
    503 
    504 
    505 void GenericPlayer::onSetAuxEffectSendLevel(const sp<AMessage> &msg) {
    506     SL_LOGV("GenericPlayer::onSetAuxEffectSendLevel()");
    507 }
    508 
    509 
    510 void GenericPlayer::onSetPlayEvents(const sp<AMessage> &msg) {
    511     SL_LOGV("GenericPlayer::onSetPlayEvents()");
    512     int32_t eventFlags, markerPositionMs, positionUpdatePeriodMs;
    513     if (msg->findInt32(WHATPARAM_SETPLAYEVENTS_FLAGS, &eventFlags) &&
    514             msg->findInt32(WHATPARAM_SETPLAYEVENTS_MARKER, &markerPositionMs) &&
    515             msg->findInt32(WHATPARAM_SETPLAYEVENTS_UPDATE, &positionUpdatePeriodMs)) {
    516         mEventFlags = eventFlags;
    517         mMarkerPositionMs = markerPositionMs;
    518         mPositionUpdatePeriodMs = positionUpdatePeriodMs;
    519         updateOneShot();
    520     }
    521 }
    522 
    523 
    524 void GenericPlayer::onOneShot(const sp<AMessage> &msg) {
    525     SL_LOGV("GenericPlayer::onOneShot()");
    526     int32_t generation;
    527     if (msg->findInt32(WHATPARAM_ONESHOT_GENERATION, &generation)) {
    528         if (generation != mOneShotGeneration) {
    529             SL_LOGV("GenericPlayer::onOneShot() generation %d cancelled; latest is %d",
    530                     generation, mOneShotGeneration);
    531             return;
    532         }
    533         updateOneShot();
    534     }
    535 }
    536 
    537 
    538 //-------------------------------------------------
    539 void GenericPlayer::notifyStatus() {
    540     SL_LOGV("GenericPlayer::notifyStatus");
    541     notify(PLAYEREVENT_PREFETCHSTATUSCHANGE, (int32_t)mCacheStatus, true /*async*/);
    542 }
    543 
    544 
    545 void GenericPlayer::notifyCacheFill() {
    546     SL_LOGV("GenericPlayer::notifyCacheFill");
    547     mLastNotifiedCacheFill = mCacheFill;
    548     notify(PLAYEREVENT_PREFETCHFILLLEVELUPDATE, (int32_t)mLastNotifiedCacheFill, true/*async*/);
    549 }
    550 
    551 
    552 void GenericPlayer::seekComplete() {
    553     SL_LOGV("GenericPlayer::seekComplete");
    554     sp<AMessage> msg = new AMessage(kWhatSeekComplete, id());
    555     msg->post();
    556 }
    557 
    558 
    559 void GenericPlayer::bufferingUpdate(int16_t fillLevelPerMille) {
    560     SL_LOGV("GenericPlayer::bufferingUpdate");
    561     sp<AMessage> msg = new AMessage(kWhatBufferingUpdate, id());
    562     msg->setInt32(WHATPARAM_BUFFERING_UPDATE, fillLevelPerMille);
    563     msg->post();
    564 }
    565 
    566 
    567 // For the meaning of positionMs, see comment in declaration at android_GenericPlayer.h
    568 void GenericPlayer::updateOneShot(int positionMs)
    569 {
    570     SL_LOGV("GenericPlayer::updateOneShot");
    571 
    572     // nop until prepared
    573     if (!(mStateFlags & kFlagPrepared)) {
    574         return;
    575     }
    576 
    577     // cancel any pending one-shot(s)
    578     ++mOneShotGeneration;
    579 
    580     // don't restart one-shot if player is paused or stopped
    581     if (!(mStateFlags & kFlagPlaying)) {
    582         return;
    583     }
    584 
    585     // get current player position in milliseconds
    586     if (positionMs < 0) {
    587         positionMs = ANDROID_UNKNOWN_TIME;
    588     }
    589     if (positionMs == ANDROID_UNKNOWN_TIME) {
    590         getPositionMsec(&positionMs);
    591         // normalize it
    592         if (positionMs < 0) {
    593             positionMs = ANDROID_UNKNOWN_TIME;
    594         }
    595         if (ANDROID_UNKNOWN_TIME == positionMs) {
    596             // getPositionMsec is not working for some reason, give up
    597             //LOGV("Does anyone really know what time it is?");
    598             return;
    599         }
    600     }
    601 
    602     // delayUs is the expected delay between current position and marker;
    603     // the default is infinity in case there are no upcoming marker(s)
    604     int64_t delayUs = -1;
    605 
    606     // is there a marker?
    607     if ((mEventFlags & SL_PLAYEVENT_HEADATMARKER) && (mMarkerPositionMs != ANDROID_UNKNOWN_TIME)) {
    608         // check to see if we have observed the position passing through the marker
    609         if (mObservedPositionMs <= mMarkerPositionMs && mMarkerPositionMs <= positionMs) {
    610             notify(PLAYEREVENT_PLAY, (int32_t) SL_PLAYEVENT_HEADATMARKER, true /*async*/);
    611         } else if (positionMs < mMarkerPositionMs) {
    612             delayUs = (mMarkerPositionMs - positionMs) * 1000LL;
    613         }
    614     }
    615 
    616     // are periodic position updates needed?
    617     if ((mEventFlags & SL_PLAYEVENT_HEADATNEWPOS) &&
    618             (mPositionUpdatePeriodMs != ANDROID_UNKNOWN_TIME)) {
    619         // check to see if we have observed the position passing through a virtual marker, where the
    620         // virtual marker is at the previously delivered new position plus position update period
    621         int32_t virtualMarkerMs;
    622         if (mDeliveredNewPosMs != ANDROID_UNKNOWN_TIME) {
    623             virtualMarkerMs = mDeliveredNewPosMs + mPositionUpdatePeriodMs;
    624         } else if (mObservedPositionMs != ANDROID_UNKNOWN_TIME) {
    625             virtualMarkerMs = mObservedPositionMs + mPositionUpdatePeriodMs;
    626             // pretend there has been an update in the past
    627             mDeliveredNewPosMs = mObservedPositionMs;
    628         } else {
    629             virtualMarkerMs = positionMs + mPositionUpdatePeriodMs;
    630             // pretend there has been an update in the past
    631             mDeliveredNewPosMs = positionMs;
    632         }
    633         // nextVirtualMarkerMs will be set to the position of the next upcoming virtual marker
    634         int32_t nextVirtualMarkerMs;
    635         if (mObservedPositionMs <= virtualMarkerMs && virtualMarkerMs <= positionMs) {
    636             // we did pass through the virtual marker, now compute the next virtual marker
    637             mDeliveredNewPosMs = virtualMarkerMs;
    638             nextVirtualMarkerMs = virtualMarkerMs + mPositionUpdatePeriodMs;
    639             // re-synchronize if we missed an update
    640             if (nextVirtualMarkerMs <= positionMs) {
    641                 SL_LOGW("Missed SL_PLAYEVENT_HEADATNEWPOS for position %d; current position %d",
    642                         nextVirtualMarkerMs, positionMs);
    643                 // try to catch up by setting next goal to current position plus update period
    644                 mDeliveredNewPosMs = positionMs;
    645                 nextVirtualMarkerMs = positionMs + mPositionUpdatePeriodMs;
    646             }
    647             notify(PLAYEREVENT_PLAY, (int32_t) SL_PLAYEVENT_HEADATNEWPOS, true /*async*/);
    648         } else {
    649             // we did not pass through the virtual marker yet, so use same marker again
    650             nextVirtualMarkerMs = virtualMarkerMs;
    651         }
    652         // note that if arithmetic overflow occurred, nextVirtualMarkerMs will be negative
    653         if (positionMs < nextVirtualMarkerMs) {
    654             int64_t trialDelayUs;
    655             trialDelayUs = (nextVirtualMarkerMs - positionMs) * 1000LL;
    656             if (trialDelayUs > 0 && (delayUs == -1 || trialDelayUs < delayUs)) {
    657                 delayUs = trialDelayUs;
    658             }
    659         }
    660     }
    661 
    662     // we have a new observed position
    663     mObservedPositionMs = positionMs;
    664 
    665     // post the new one-shot message if needed
    666     if (advancesPositionInRealTime() && delayUs >= 0) {
    667         // 20 ms min delay to avoid near busy waiting
    668         if (delayUs < 20000LL) {
    669             delayUs = 20000LL;
    670         }
    671         // 1 minute max delay avoids indefinite memory leaks caused by cancelled one-shots
    672         if (delayUs > 60000000LL) {
    673             delayUs = 60000000LL;
    674         }
    675         //SL_LOGI("delayUs = %lld", delayUs);
    676         sp<AMessage> msg = new AMessage(kWhatOneShot, id());
    677         msg->setInt32(WHATPARAM_ONESHOT_GENERATION, mOneShotGeneration);
    678         msg->post(delayUs);
    679     }
    680 
    681 }
    682 
    683 } // namespace android
    684