android_GenericPlayer.cpp revision 5e4d65e369f28746767aba11b618dee314bb8197 
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
24namespace android {
25
26//--------------------------------------------------------------------------------------------------
27GenericPlayer::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
54GenericPlayer::~GenericPlayer() {
55    SL_LOGV("GenericPlayer::~GenericPlayer()");
56
57    resetDataLocator();
58}
59
60
61void 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
75void 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
88void 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
98void 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
132void 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
142void GenericPlayer::play() {
143    SL_LOGD("GenericPlayer::play()");
144    sp<AMessage> msg = new AMessage(kWhatPlay, id());
145    msg->post();
146}
147
148
149void GenericPlayer::pause() {
150    SL_LOGD("GenericPlayer::pause()");
151    sp<AMessage> msg = new AMessage(kWhatPause, id());
152    msg->post();
153}
154
155
156void 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
165void 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
177void 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
185void 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//--------------------------------------------------
194void GenericPlayer::getDurationMsec(int* msec) {
195    *msec = mDurationMsec;
196}
197
198//--------------------------------------------------
199void 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//--------------------------------------------------
212void 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//--------------------------------------------------
222void 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_*
233void 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 */
260void 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
272void 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
285void 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
300void 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
384void 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
395void 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
440void 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
450void 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
460void GenericPlayer::onSeek(const sp<AMessage> &msg) {
461    SL_LOGV("GenericPlayer::onSeek");
462}
463
464
465void GenericPlayer::onLoop(const sp<AMessage> &msg) {
466    SL_LOGV("GenericPlayer::onLoop");
467}
468
469
470void GenericPlayer::onVolumeUpdate() {
471    SL_LOGV("GenericPlayer::onVolumeUpdate");
472}
473
474
475void 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
485void GenericPlayer::onBufferingUpdate(const sp<AMessage> &msg) {
486    SL_LOGV("GenericPlayer::onBufferingUpdate");
487}
488
489
490void 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
500void GenericPlayer::onAttachAuxEffect(const sp<AMessage> &msg) {
501    SL_LOGV("GenericPlayer::onAttachAuxEffect()");
502}
503
504
505void GenericPlayer::onSetAuxEffectSendLevel(const sp<AMessage> &msg) {
506    SL_LOGV("GenericPlayer::onSetAuxEffectSendLevel()");
507}
508
509
510void 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
524void 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//-------------------------------------------------
539void GenericPlayer::notifyStatus() {
540    SL_LOGV("GenericPlayer::notifyStatus");
541    notify(PLAYEREVENT_PREFETCHSTATUSCHANGE, (int32_t)mCacheStatus, true /*async*/);
542}
543
544
545void GenericPlayer::notifyCacheFill() {
546    SL_LOGV("GenericPlayer::notifyCacheFill");
547    mLastNotifiedCacheFill = mCacheFill;
548    notify(PLAYEREVENT_PREFETCHFILLLEVELUPDATE, (int32_t)mLastNotifiedCacheFill, true/*async*/);
549}
550
551
552void GenericPlayer::seekComplete() {
553    SL_LOGV("GenericPlayer::seekComplete");
554    sp<AMessage> msg = new AMessage(kWhatSeekComplete, id());
555    msg->post();
556}
557
558
559void 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
568void 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