android_GenericPlayer.cpp revision 1fa5c3206d06bbebdea2dc92f378ce6b8a211e23 
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    Mutex::Autolock _l(mSettingsLock);
196    *msec = mDurationMsec;
197}
198
199//--------------------------------------------------
200void GenericPlayer::setVolume(float leftVol, float rightVol)
201{
202    {
203        Mutex::Autolock _l(mSettingsLock);
204        mAndroidAudioLevels.mFinalVolume[0] = leftVol;
205        mAndroidAudioLevels.mFinalVolume[1] = rightVol;
206    }
207    // send a message for the volume to be updated by the object which implements the volume
208    (new AMessage(kWhatVolumeUpdate, id()))->post();
209}
210
211
212//--------------------------------------------------
213void GenericPlayer::attachAuxEffect(int32_t effectId)
214{
215    SL_LOGV("GenericPlayer::attachAuxEffect(id=%d)", effectId);
216    sp<AMessage> msg = new AMessage(kWhatAttachAuxEffect, id());
217    msg->setInt32(WHATPARAM_ATTACHAUXEFFECT, effectId);
218    msg->post();
219}
220
221
222//--------------------------------------------------
223void GenericPlayer::setAuxEffectSendLevel(float level)
224{
225    SL_LOGV("GenericPlayer::setAuxEffectSendLevel(level=%g)", level);
226    sp<AMessage> msg = new AMessage(kWhatSetAuxEffectSendLevel, id());
227    msg->setFloat(WHATPARAM_SETAUXEFFECTSENDLEVEL, level);
228    msg->post();
229}
230
231
232//--------------------------------------------------
233// Call after changing any of the IPlay settings related to SL_PLAYEVENT_*
234void GenericPlayer::setPlayEvents(int32_t eventFlags, int32_t markerPositionMs,
235        int32_t positionUpdatePeriodMs)
236{
237    // Normalize ms that are within the valid unsigned range, but not in the int32_t range
238    if (markerPositionMs < 0) {
239        markerPositionMs = ANDROID_UNKNOWN_TIME;
240    }
241    if (positionUpdatePeriodMs < 0) {
242        positionUpdatePeriodMs = ANDROID_UNKNOWN_TIME;
243    }
244    // markers are delivered accurately, but new position updates are limited to every 100 ms
245    if (positionUpdatePeriodMs < 100) {
246        positionUpdatePeriodMs = 100;
247    }
248    sp<AMessage> msg = new AMessage(kWhatSetPlayEvents, id());
249    msg->setInt32(WHATPARAM_SETPLAYEVENTS_FLAGS, eventFlags);
250    msg->setInt32(WHATPARAM_SETPLAYEVENTS_MARKER, markerPositionMs);
251    msg->setInt32(WHATPARAM_SETPLAYEVENTS_UPDATE, positionUpdatePeriodMs);
252    msg->post();
253}
254
255
256//--------------------------------------------------
257/*
258 * post-condition: mDataLocatorType == kDataLocatorNone
259 *
260 */
261void GenericPlayer::resetDataLocator() {
262    SL_LOGV("GenericPlayer::resetDataLocator()");
263    if (mDataLocatorType == kDataLocatorFd && mDataLocator.fdi.mCloseAfterUse) {
264        (void) ::close(mDataLocator.fdi.fd);
265        // would be redundant, as we're about to invalidate the union mDataLocator
266        //mDataLocator.fdi.fd = -1;
267        //mDataLocator.fdi.mCloseAfterUse = false;
268    }
269    mDataLocatorType = kDataLocatorNone;
270}
271
272
273void GenericPlayer::notify(const char* event, int data, bool async) {
274    SL_LOGV("GenericPlayer::notify(event=%s, data=%d, async=%s)", event, data,
275            async ? "true" : "false");
276    sp<AMessage> msg = new AMessage(kWhatNotif, id());
277    msg->setInt32(event, (int32_t)data);
278    if (async) {
279        msg->post();
280    } else {
281        this->onNotify(msg);
282    }
283}
284
285
286void GenericPlayer::notify(const char* event, int data1, int data2, bool async) {
287    SL_LOGV("GenericPlayer::notify(event=%s, data1=%d, data2=%d, async=%s)", event, data1, data2,
288            async ? "true" : "false");
289    sp<AMessage> msg = new AMessage(kWhatNotif, id());
290    msg->setRect(event, 0, 0, (int32_t)data1, (int32_t)data2);
291    if (async) {
292        msg->post();
293    } else {
294        this->onNotify(msg);
295    }
296}
297
298
299//--------------------------------------------------
300// AHandler implementation
301void GenericPlayer::onMessageReceived(const sp<AMessage> &msg) {
302    SL_LOGV("GenericPlayer::onMessageReceived()");
303    switch (msg->what()) {
304        case kWhatPrepare:
305            SL_LOGV("kWhatPrepare");
306            onPrepare();
307            break;
308
309        case kWhatNotif:
310            SL_LOGV("kWhatNotif");
311            onNotify(msg);
312            break;
313
314        case kWhatPlay:
315            SL_LOGV("kWhatPlay");
316            onPlay();
317            break;
318
319        case kWhatPause:
320            SL_LOGV("kWhatPause");
321            onPause();
322            break;
323
324        case kWhatSeek:
325            SL_LOGV("kWhatSeek");
326            onSeek(msg);
327            break;
328
329        case kWhatLoop:
330            SL_LOGV("kWhatLoop");
331            onLoop(msg);
332            break;
333
334        case kWhatVolumeUpdate:
335            SL_LOGV("kWhatVolumeUpdate");
336            onVolumeUpdate();
337            break;
338
339        case kWhatSeekComplete:
340            SL_LOGV("kWhatSeekComplete");
341            onSeekComplete();
342            break;
343
344        case kWhatBufferingUpdate:
345            SL_LOGV("kWhatBufferingUpdate");
346            onBufferingUpdate(msg);
347            break;
348
349        case kWhatBuffUpdateThres:
350            SL_LOGV("kWhatBuffUpdateThres");
351            onSetBufferingUpdateThreshold(msg);
352            break;
353
354        case kWhatAttachAuxEffect:
355            SL_LOGV("kWhatAttachAuxEffect");
356            onAttachAuxEffect(msg);
357            break;
358
359        case kWhatSetAuxEffectSendLevel:
360            SL_LOGV("kWhatSetAuxEffectSendLevel");
361            onSetAuxEffectSendLevel(msg);
362            break;
363
364        case kWhatSetPlayEvents:
365            SL_LOGV("kWhatSetPlayEvents");
366            onSetPlayEvents(msg);
367            break;
368
369        case kWhatOneShot:
370            SL_LOGV("kWhatOneShot");
371            onOneShot(msg);
372            break;
373
374        default:
375            SL_LOGE("GenericPlayer::onMessageReceived unknown message %d", msg->what());
376            TRESPASS();
377    }
378}
379
380
381//--------------------------------------------------
382// Event handlers
383//  it is strictly verboten to call those methods outside of the event loop
384
385void GenericPlayer::onPrepare() {
386    SL_LOGV("GenericPlayer::onPrepare()");
387    // Subclass is responsible for indicating whether prepare was successful or unsuccessful
388    // by updating mStateFlags accordingly.  It must set exactly one of these two flags.
389    assert(!(mStateFlags & kFlagPrepared) != !(mStateFlags & kFlagPreparedUnsuccessfully));
390    notify(PLAYEREVENT_PREPARED, mStateFlags & kFlagPrepared ? PLAYER_SUCCESS : PLAYER_FAILURE,
391            true /*async*/);
392    SL_LOGD("GenericPlayer::onPrepare() done, mStateFlags=0x%x", mStateFlags);
393}
394
395
396void GenericPlayer::onNotify(const sp<AMessage> &msg) {
397    SL_LOGV("GenericPlayer::onNotify()");
398    notif_cbf_t notifClient;
399    void*       notifUser;
400    {
401        android::Mutex::Autolock autoLock(mNotifyClientLock);
402        if (NULL == mNotifyClient) {
403            return;
404        } else {
405            notifClient = mNotifyClient;
406            notifUser   = mNotifyUser;
407        }
408    }
409
410    int32_t val1, val2;
411    if (msg->findInt32(PLAYEREVENT_PREFETCHSTATUSCHANGE, &val1)) {
412        SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PREFETCHSTATUSCHANGE, val1);
413        notifClient(kEventPrefetchStatusChange, val1, 0, notifUser);
414    } else if (msg->findInt32(PLAYEREVENT_PREFETCHFILLLEVELUPDATE, &val1)) {
415        SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PREFETCHFILLLEVELUPDATE, val1);
416        notifClient(kEventPrefetchFillLevelUpdate, val1, 0, notifUser);
417    } else if (msg->findInt32(PLAYEREVENT_ENDOFSTREAM, &val1)) {
418        SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_ENDOFSTREAM, val1);
419        notifClient(kEventEndOfStream, val1, 0, notifUser);
420    } else if (msg->findInt32(PLAYEREVENT_PREPARED, &val1)) {
421        SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PREPARED, val1);
422        notifClient(kEventPrepared, val1, 0, notifUser);
423    } else if (msg->findInt32(PLAYEREVENT_CHANNEL_COUNT, &val1)) {
424        SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_CHANNEL_COUNT, val1);
425        notifClient(kEventChannelCount, val1, 0, notifUser);
426    } else if (msg->findRect(PLAYEREVENT_VIDEO_SIZE_UPDATE, &val1, &val2, &val1, &val2)) {
427        SL_LOGV("GenericPlayer notifying %s = %d, %d", PLAYEREVENT_VIDEO_SIZE_UPDATE, val1, val2);
428        notifClient(kEventHasVideoSize, val1, val2, notifUser);
429    } else if (msg->findInt32(PLAYEREVENT_PLAY, &val1)) {
430        SL_LOGV("GenericPlayer notifying %s = %d", PLAYEREVENT_PLAY, val1);
431        notifClient(kEventPlay, val1, 0, notifUser);
432    } else {
433        SL_LOGV("GenericPlayer notifying unknown");
434    }
435}
436
437
438void GenericPlayer::onPlay() {
439    SL_LOGD("GenericPlayer::onPlay()");
440    if ((mStateFlags & (kFlagPrepared | kFlagPlaying)) == kFlagPrepared) {
441        SL_LOGD("starting player");
442        mStateFlags |= kFlagPlaying;
443        updateOneShot();
444    }
445}
446
447
448void GenericPlayer::onPause() {
449    SL_LOGD("GenericPlayer::onPause()");
450    if (!(~mStateFlags & (kFlagPrepared | kFlagPlaying))) {
451        SL_LOGV("pausing player");
452        mStateFlags &= ~kFlagPlaying;
453        updateOneShot();
454    }
455}
456
457
458void GenericPlayer::onSeek(const sp<AMessage> &msg) {
459    SL_LOGV("GenericPlayer::onSeek");
460}
461
462
463void GenericPlayer::onLoop(const sp<AMessage> &msg) {
464    SL_LOGV("GenericPlayer::onLoop");
465}
466
467
468void GenericPlayer::onVolumeUpdate() {
469    SL_LOGV("GenericPlayer::onVolumeUpdate");
470}
471
472
473void GenericPlayer::onSeekComplete() {
474    SL_LOGD("GenericPlayer::onSeekComplete()");
475    mStateFlags &= ~kFlagSeeking;
476    // avoid spurious or lost events caused by seeking past a marker
477    mDeliveredNewPosMs = ANDROID_UNKNOWN_TIME;
478    mObservedPositionMs = ANDROID_UNKNOWN_TIME;
479    updateOneShot();
480}
481
482
483void GenericPlayer::onBufferingUpdate(const sp<AMessage> &msg) {
484    SL_LOGV("GenericPlayer::onBufferingUpdate");
485}
486
487
488void GenericPlayer::onSetBufferingUpdateThreshold(const sp<AMessage> &msg) {
489    SL_LOGV("GenericPlayer::onSetBufferingUpdateThreshold");
490    int32_t thresholdPercent = 0;
491    if (msg->findInt32(WHATPARAM_BUFFERING_UPDATETHRESHOLD_PERCENT, &thresholdPercent)) {
492        Mutex::Autolock _l(mSettingsLock);
493        mCacheFillNotifThreshold = (int16_t)thresholdPercent;
494    }
495}
496
497
498void GenericPlayer::onAttachAuxEffect(const sp<AMessage> &msg) {
499    SL_LOGV("GenericPlayer::onAttachAuxEffect()");
500}
501
502
503void GenericPlayer::onSetAuxEffectSendLevel(const sp<AMessage> &msg) {
504    SL_LOGV("GenericPlayer::onSetAuxEffectSendLevel()");
505}
506
507
508void GenericPlayer::onSetPlayEvents(const sp<AMessage> &msg) {
509    SL_LOGV("GenericPlayer::onSetPlayEvents()");
510    int32_t eventFlags, markerPositionMs, positionUpdatePeriodMs;
511    if (msg->findInt32(WHATPARAM_SETPLAYEVENTS_FLAGS, &eventFlags) &&
512            msg->findInt32(WHATPARAM_SETPLAYEVENTS_MARKER, &markerPositionMs) &&
513            msg->findInt32(WHATPARAM_SETPLAYEVENTS_UPDATE, &positionUpdatePeriodMs)) {
514        mEventFlags = eventFlags;
515        mMarkerPositionMs = markerPositionMs;
516        mPositionUpdatePeriodMs = positionUpdatePeriodMs;
517        updateOneShot();
518    }
519}
520
521
522void GenericPlayer::onOneShot(const sp<AMessage> &msg) {
523    SL_LOGV("GenericPlayer::onOneShot()");
524    int32_t generation;
525    if (msg->findInt32(WHATPARAM_ONESHOT_GENERATION, &generation)) {
526        if (generation != mOneShotGeneration) {
527            SL_LOGV("GenericPlayer::onOneShot() generation %d cancelled; latest is %d",
528                    generation, mOneShotGeneration);
529            return;
530        }
531        updateOneShot();
532    }
533}
534
535
536//-------------------------------------------------
537void GenericPlayer::notifyStatus() {
538    SL_LOGV("GenericPlayer::notifyStatus");
539    notify(PLAYEREVENT_PREFETCHSTATUSCHANGE, (int32_t)mCacheStatus, true /*async*/);
540}
541
542
543void GenericPlayer::notifyCacheFill() {
544    SL_LOGV("GenericPlayer::notifyCacheFill");
545    mLastNotifiedCacheFill = mCacheFill;
546    notify(PLAYEREVENT_PREFETCHFILLLEVELUPDATE, (int32_t)mLastNotifiedCacheFill, true/*async*/);
547}
548
549
550void GenericPlayer::seekComplete() {
551    SL_LOGV("GenericPlayer::seekComplete");
552    sp<AMessage> msg = new AMessage(kWhatSeekComplete, id());
553    msg->post();
554}
555
556
557void GenericPlayer::bufferingUpdate(int16_t fillLevelPerMille) {
558    SL_LOGV("GenericPlayer::bufferingUpdate");
559    sp<AMessage> msg = new AMessage(kWhatBufferingUpdate, id());
560    msg->setInt32(WHATPARAM_BUFFERING_UPDATE, fillLevelPerMille);
561    msg->post();
562}
563
564
565// For the meaning of positionMs, see comment in declaration at android_GenericPlayer.h
566void GenericPlayer::updateOneShot(int positionMs)
567{
568    SL_LOGV("GenericPlayer::updateOneShot");
569
570    // nop until prepared
571    if (!(mStateFlags & kFlagPrepared)) {
572        return;
573    }
574
575    // cancel any pending one-shot(s)
576    ++mOneShotGeneration;
577
578    // don't restart one-shot if player is paused or stopped
579    if (!(mStateFlags & kFlagPlaying)) {
580        return;
581    }
582
583    // get current player position in milliseconds
584    if (positionMs < 0) {
585        positionMs = ANDROID_UNKNOWN_TIME;
586    }
587    if (positionMs == ANDROID_UNKNOWN_TIME) {
588        getPositionMsec(&positionMs);
589        // normalize it
590        if (positionMs < 0) {
591            positionMs = ANDROID_UNKNOWN_TIME;
592        }
593        if (ANDROID_UNKNOWN_TIME == positionMs) {
594            // getPositionMsec is not working for some reason, give up
595            //LOGV("Does anyone really know what time it is?");
596            return;
597        }
598    }
599
600    // delayUs is the expected delay between current position and marker;
601    // the default is infinity in case there are no upcoming marker(s)
602    int64_t delayUs = -1;
603
604    // is there a marker?
605    if ((mEventFlags & SL_PLAYEVENT_HEADATMARKER) && (mMarkerPositionMs != ANDROID_UNKNOWN_TIME)) {
606        // check to see if we have observed the position passing through the marker
607        if (mObservedPositionMs <= mMarkerPositionMs && mMarkerPositionMs <= positionMs) {
608            notify(PLAYEREVENT_PLAY, (int32_t) SL_PLAYEVENT_HEADATMARKER, true /*async*/);
609        } else if (positionMs < mMarkerPositionMs) {
610            delayUs = (mMarkerPositionMs - positionMs) * 1000LL;
611        }
612    }
613
614    // are periodic position updates needed?
615    if ((mEventFlags & SL_PLAYEVENT_HEADATNEWPOS) &&
616            (mPositionUpdatePeriodMs != ANDROID_UNKNOWN_TIME)) {
617        // check to see if we have observed the position passing through a virtual marker, where the
618        // virtual marker is at the previously delivered new position plus position update period
619        int32_t virtualMarkerMs;
620        if (mDeliveredNewPosMs != ANDROID_UNKNOWN_TIME) {
621            virtualMarkerMs = mDeliveredNewPosMs + mPositionUpdatePeriodMs;
622        } else if (mObservedPositionMs != ANDROID_UNKNOWN_TIME) {
623            virtualMarkerMs = mObservedPositionMs + mPositionUpdatePeriodMs;
624            // pretend there has been an update in the past
625            mDeliveredNewPosMs = mObservedPositionMs;
626        } else {
627            virtualMarkerMs = positionMs + mPositionUpdatePeriodMs;
628            // pretend there has been an update in the past
629            mDeliveredNewPosMs = positionMs;
630        }
631        // nextVirtualMarkerMs will be set to the position of the next upcoming virtual marker
632        int32_t nextVirtualMarkerMs;
633        if (mObservedPositionMs <= virtualMarkerMs && virtualMarkerMs <= positionMs) {
634            // we did pass through the virtual marker, now compute the next virtual marker
635            mDeliveredNewPosMs = virtualMarkerMs;
636            nextVirtualMarkerMs = virtualMarkerMs + mPositionUpdatePeriodMs;
637            // re-synchronize if we missed an update
638            if (nextVirtualMarkerMs <= positionMs) {
639                SL_LOGW("Missed SL_PLAYEVENT_HEADATNEWPOS for position %d; current position %d",
640                        nextVirtualMarkerMs, positionMs);
641                // try to catch up by setting next goal to current position plus update period
642                mDeliveredNewPosMs = positionMs;
643                nextVirtualMarkerMs = positionMs + mPositionUpdatePeriodMs;
644            }
645            notify(PLAYEREVENT_PLAY, (int32_t) SL_PLAYEVENT_HEADATNEWPOS, true /*async*/);
646        } else {
647            // we did not pass through the virtual marker yet, so use same marker again
648            nextVirtualMarkerMs = virtualMarkerMs;
649        }
650        // note that if arithmetic overflow occurred, nextVirtualMarkerMs will be negative
651        if (positionMs < nextVirtualMarkerMs) {
652            int64_t trialDelayUs;
653            trialDelayUs = (nextVirtualMarkerMs - positionMs) * 1000LL;
654            if (trialDelayUs > 0 && (delayUs == -1 || trialDelayUs < delayUs)) {
655                delayUs = trialDelayUs;
656            }
657        }
658    }
659
660    // we have a new observed position
661    mObservedPositionMs = positionMs;
662
663    // post the new one-shot message if needed
664    if (advancesPositionInRealTime() && delayUs >= 0) {
665        // 20 ms min delay to avoid near busy waiting
666        if (delayUs < 20000LL) {
667            delayUs = 20000LL;
668        }
669        // 1 minute max delay avoids indefinite memory leaks caused by cancelled one-shots
670        if (delayUs > 60000000LL) {
671            delayUs = 60000000LL;
672        }
673        //SL_LOGI("delayUs = %lld", delayUs);
674        sp<AMessage> msg = new AMessage(kWhatOneShot, id());
675        msg->setInt32(WHATPARAM_ONESHOT_GENERATION, mOneShotGeneration);
676        msg->post(delayUs);
677    }
678
679}
680
681} // namespace android
682