GenericSource.cpp revision efbb61950db36a5eb789be83f077246172507c67 
1/*
2 * Copyright (C) 2012 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 LOG_NDEBUG 0
18#define LOG_TAG "GenericSource"
19
20#include "GenericSource.h"
21
22#include "AnotherPacketSource.h"
23
24#include <media/IMediaHTTPService.h>
25#include <media/stagefright/foundation/ABuffer.h>
26#include <media/stagefright/foundation/ADebug.h>
27#include <media/stagefright/foundation/AMessage.h>
28#include <media/stagefright/DataSource.h>
29#include <media/stagefright/FileSource.h>
30#include <media/stagefright/MediaBuffer.h>
31#include <media/stagefright/MediaDefs.h>
32#include <media/stagefright/MediaExtractor.h>
33#include <media/stagefright/MediaSource.h>
34#include <media/stagefright/MetaData.h>
35#include <media/stagefright/Utils.h>
36#include "../../libstagefright/include/DRMExtractor.h"
37#include "../../libstagefright/include/NuCachedSource2.h"
38#include "../../libstagefright/include/WVMExtractor.h"
39#include "../../libstagefright/include/HTTPBase.h"
40
41namespace android {
42
43static int64_t kLowWaterMarkUs = 2000000ll;  // 2secs
44static int64_t kHighWaterMarkUs = 5000000ll;  // 5secs
45static const ssize_t kLowWaterMarkBytes = 40000;
46static const ssize_t kHighWaterMarkBytes = 200000;
47
48NuPlayer::GenericSource::GenericSource(
49        const sp<AMessage> &notify,
50        bool uidValid,
51        uid_t uid)
52    : Source(notify),
53      mAudioTimeUs(0),
54      mAudioLastDequeueTimeUs(0),
55      mVideoTimeUs(0),
56      mVideoLastDequeueTimeUs(0),
57      mFetchSubtitleDataGeneration(0),
58      mFetchTimedTextDataGeneration(0),
59      mDurationUs(0ll),
60      mAudioIsVorbis(false),
61      mIsWidevine(false),
62      mIsSecure(false),
63      mIsStreaming(false),
64      mUIDValid(uidValid),
65      mUID(uid),
66      mFd(-1),
67      mDrmManagerClient(NULL),
68      mMetaDataSize(-1ll),
69      mBitrate(-1ll),
70      mPollBufferingGeneration(0),
71      mPendingReadBufferTypes(0),
72      mBuffering(false),
73      mPrepareBuffering(false) {
74    resetDataSource();
75    DataSource::RegisterDefaultSniffers();
76}
77
78void NuPlayer::GenericSource::resetDataSource() {
79    mHTTPService.clear();
80    mHttpSource.clear();
81    mUri.clear();
82    mUriHeaders.clear();
83    if (mFd >= 0) {
84        close(mFd);
85        mFd = -1;
86    }
87    mOffset = 0;
88    mLength = 0;
89    setDrmPlaybackStatusIfNeeded(Playback::STOP, 0);
90    mDecryptHandle = NULL;
91    mDrmManagerClient = NULL;
92    mStarted = false;
93    mStopRead = true;
94}
95
96status_t NuPlayer::GenericSource::setDataSource(
97        const sp<IMediaHTTPService> &httpService,
98        const char *url,
99        const KeyedVector<String8, String8> *headers) {
100    resetDataSource();
101
102    mHTTPService = httpService;
103    mUri = url;
104
105    if (headers) {
106        mUriHeaders = *headers;
107    }
108
109    // delay data source creation to prepareAsync() to avoid blocking
110    // the calling thread in setDataSource for any significant time.
111    return OK;
112}
113
114status_t NuPlayer::GenericSource::setDataSource(
115        int fd, int64_t offset, int64_t length) {
116    resetDataSource();
117
118    mFd = dup(fd);
119    mOffset = offset;
120    mLength = length;
121
122    // delay data source creation to prepareAsync() to avoid blocking
123    // the calling thread in setDataSource for any significant time.
124    return OK;
125}
126
127sp<MetaData> NuPlayer::GenericSource::getFileFormatMeta() const {
128    return mFileMeta;
129}
130
131status_t NuPlayer::GenericSource::initFromDataSource() {
132    sp<MediaExtractor> extractor;
133
134    CHECK(mDataSource != NULL);
135
136    if (mIsWidevine) {
137        String8 mimeType;
138        float confidence;
139        sp<AMessage> dummy;
140        bool success;
141
142        success = SniffWVM(mDataSource, &mimeType, &confidence, &dummy);
143        if (!success
144                || strcasecmp(
145                    mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM)) {
146            ALOGE("unsupported widevine mime: %s", mimeType.string());
147            return UNKNOWN_ERROR;
148        }
149
150        mWVMExtractor = new WVMExtractor(mDataSource);
151        mWVMExtractor->setAdaptiveStreamingMode(true);
152        if (mUIDValid) {
153            mWVMExtractor->setUID(mUID);
154        }
155        extractor = mWVMExtractor;
156    } else {
157        extractor = MediaExtractor::Create(mDataSource,
158                mSniffedMIME.empty() ? NULL: mSniffedMIME.c_str());
159    }
160
161    if (extractor == NULL) {
162        return UNKNOWN_ERROR;
163    }
164
165    if (extractor->getDrmFlag()) {
166        checkDrmStatus(mDataSource);
167    }
168
169    mFileMeta = extractor->getMetaData();
170    if (mFileMeta != NULL) {
171        int64_t duration;
172        if (mFileMeta->findInt64(kKeyDuration, &duration)) {
173            mDurationUs = duration;
174        }
175
176        if (!mIsWidevine) {
177            // Check mime to see if we actually have a widevine source.
178            // If the data source is not URL-type (eg. file source), we
179            // won't be able to tell until now.
180            const char *fileMime;
181            if (mFileMeta->findCString(kKeyMIMEType, &fileMime)
182                    && !strncasecmp(fileMime, "video/wvm", 9)) {
183                mIsWidevine = true;
184                if (!mUri.empty()) {
185                  // streaming, but the app forgot to specify widevine:// url
186                  mWVMExtractor = static_cast<WVMExtractor *>(extractor.get());
187                  mWVMExtractor->setAdaptiveStreamingMode(true);
188                  if (mUIDValid) {
189                    mWVMExtractor->setUID(mUID);
190                  }
191                }
192            }
193        }
194    }
195
196    int32_t totalBitrate = 0;
197
198    size_t numtracks = extractor->countTracks();
199    if (numtracks == 0) {
200        return UNKNOWN_ERROR;
201    }
202
203    for (size_t i = 0; i < numtracks; ++i) {
204        sp<MediaSource> track = extractor->getTrack(i);
205
206        sp<MetaData> meta = extractor->getTrackMetaData(i);
207
208        const char *mime;
209        CHECK(meta->findCString(kKeyMIMEType, &mime));
210
211        // Do the string compare immediately with "mime",
212        // we can't assume "mime" would stay valid after another
213        // extractor operation, some extractors might modify meta
214        // during getTrack() and make it invalid.
215        if (!strncasecmp(mime, "audio/", 6)) {
216            if (mAudioTrack.mSource == NULL) {
217                mAudioTrack.mIndex = i;
218                mAudioTrack.mSource = track;
219                mAudioTrack.mPackets =
220                    new AnotherPacketSource(mAudioTrack.mSource->getFormat());
221
222                if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_VORBIS)) {
223                    mAudioIsVorbis = true;
224                } else {
225                    mAudioIsVorbis = false;
226                }
227            }
228        } else if (!strncasecmp(mime, "video/", 6)) {
229            if (mVideoTrack.mSource == NULL) {
230                mVideoTrack.mIndex = i;
231                mVideoTrack.mSource = track;
232                mVideoTrack.mPackets =
233                    new AnotherPacketSource(mVideoTrack.mSource->getFormat());
234
235                // check if the source requires secure buffers
236                int32_t secure;
237                if (meta->findInt32(kKeyRequiresSecureBuffers, &secure)
238                        && secure) {
239                    mIsSecure = true;
240                    if (mUIDValid) {
241                        extractor->setUID(mUID);
242                    }
243                }
244            }
245        }
246
247        if (track != NULL) {
248            mSources.push(track);
249            int64_t durationUs;
250            if (meta->findInt64(kKeyDuration, &durationUs)) {
251                if (durationUs > mDurationUs) {
252                    mDurationUs = durationUs;
253                }
254            }
255
256            int32_t bitrate;
257            if (totalBitrate >= 0 && meta->findInt32(kKeyBitRate, &bitrate)) {
258                totalBitrate += bitrate;
259            } else {
260                totalBitrate = -1;
261            }
262        }
263    }
264
265    // Start the selected A/V tracks now before we start buffering.
266    // Widevine sources might re-initialize crypto when starting, if we delay
267    // this to start(), all data buffered during prepare would be wasted.
268    // (We don't actually start reading until start().)
269    if (mAudioTrack.mSource != NULL && mAudioTrack.mSource->start() != OK) {
270        ALOGE("failed to start audio track!");
271        return UNKNOWN_ERROR;
272    }
273
274    if (mVideoTrack.mSource != NULL && mVideoTrack.mSource->start() != OK) {
275        ALOGE("failed to start video track!");
276        return UNKNOWN_ERROR;
277    }
278
279    mBitrate = totalBitrate;
280
281    return OK;
282}
283
284void NuPlayer::GenericSource::checkDrmStatus(const sp<DataSource>& dataSource) {
285    dataSource->getDrmInfo(mDecryptHandle, &mDrmManagerClient);
286    if (mDecryptHandle != NULL) {
287        CHECK(mDrmManagerClient);
288        if (RightsStatus::RIGHTS_VALID != mDecryptHandle->status) {
289            sp<AMessage> msg = dupNotify();
290            msg->setInt32("what", kWhatDrmNoLicense);
291            msg->post();
292        }
293    }
294}
295
296int64_t NuPlayer::GenericSource::getLastReadPosition() {
297    if (mAudioTrack.mSource != NULL) {
298        return mAudioTimeUs;
299    } else if (mVideoTrack.mSource != NULL) {
300        return mVideoTimeUs;
301    } else {
302        return 0;
303    }
304}
305
306status_t NuPlayer::GenericSource::setBuffers(
307        bool audio, Vector<MediaBuffer *> &buffers) {
308    if (mIsSecure && !audio) {
309        return mVideoTrack.mSource->setBuffers(buffers);
310    }
311    return INVALID_OPERATION;
312}
313
314NuPlayer::GenericSource::~GenericSource() {
315    if (mLooper != NULL) {
316        mLooper->unregisterHandler(id());
317        mLooper->stop();
318    }
319    resetDataSource();
320}
321
322void NuPlayer::GenericSource::prepareAsync() {
323    if (mLooper == NULL) {
324        mLooper = new ALooper;
325        mLooper->setName("generic");
326        mLooper->start();
327
328        mLooper->registerHandler(this);
329    }
330
331    sp<AMessage> msg = new AMessage(kWhatPrepareAsync, id());
332    msg->post();
333}
334
335void NuPlayer::GenericSource::onPrepareAsync() {
336    // delayed data source creation
337    if (mDataSource == NULL) {
338        // set to false first, if the extractor
339        // comes back as secure, set it to true then.
340        mIsSecure = false;
341
342        if (!mUri.empty()) {
343            const char* uri = mUri.c_str();
344            mIsWidevine = !strncasecmp(uri, "widevine://", 11);
345
346            if (!strncasecmp("http://", uri, 7)
347                    || !strncasecmp("https://", uri, 8)
348                    || mIsWidevine) {
349                mHttpSource = DataSource::CreateMediaHTTP(mHTTPService);
350                if (mHttpSource == NULL) {
351                    ALOGE("Failed to create http source!");
352                    notifyPreparedAndCleanup(UNKNOWN_ERROR);
353                    return;
354                }
355            }
356
357            mDataSource = DataSource::CreateFromURI(
358                   mHTTPService, uri, &mUriHeaders, &mContentType,
359                   static_cast<HTTPBase *>(mHttpSource.get()));
360        } else {
361            mIsWidevine = false;
362
363            mDataSource = new FileSource(mFd, mOffset, mLength);
364            mFd = -1;
365        }
366
367        if (mDataSource == NULL) {
368            ALOGE("Failed to create data source!");
369            notifyPreparedAndCleanup(UNKNOWN_ERROR);
370            return;
371        }
372
373        if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
374            mCachedSource = static_cast<NuCachedSource2 *>(mDataSource.get());
375        }
376
377        // For widevine or other cached streaming cases, we need to wait for
378        // enough buffering before reporting prepared.
379        // Note that even when URL doesn't start with widevine://, mIsWidevine
380        // could still be set to true later, if the streaming or file source
381        // is sniffed to be widevine. We don't want to buffer for file source
382        // in that case, so must check the flag now.
383        mIsStreaming = (mIsWidevine || mCachedSource != NULL);
384    }
385
386    // check initial caching status
387    status_t err = prefillCacheIfNecessary();
388    if (err != OK) {
389        if (err == -EAGAIN) {
390            (new AMessage(kWhatPrepareAsync, id()))->post(200000);
391        } else {
392            ALOGE("Failed to prefill data cache!");
393            notifyPreparedAndCleanup(UNKNOWN_ERROR);
394        }
395        return;
396    }
397
398    // init extrator from data source
399    err = initFromDataSource();
400
401    if (err != OK) {
402        ALOGE("Failed to init from data source!");
403        notifyPreparedAndCleanup(err);
404        return;
405    }
406
407    if (mVideoTrack.mSource != NULL) {
408        sp<MetaData> meta = doGetFormatMeta(false /* audio */);
409        sp<AMessage> msg = new AMessage;
410        err = convertMetaDataToMessage(meta, &msg);
411        if(err != OK) {
412            notifyPreparedAndCleanup(err);
413            return;
414        }
415        notifyVideoSizeChanged(msg);
416    }
417
418    notifyFlagsChanged(
419            (mIsSecure ? FLAG_SECURE : 0)
420            | (mDecryptHandle != NULL ? FLAG_PROTECTED : 0)
421            | FLAG_CAN_PAUSE
422            | FLAG_CAN_SEEK_BACKWARD
423            | FLAG_CAN_SEEK_FORWARD
424            | FLAG_CAN_SEEK);
425
426    if (mIsStreaming) {
427        mPrepareBuffering = true;
428
429        ensureCacheIsFetching();
430        restartPollBuffering();
431    } else {
432        notifyPrepared();
433    }
434}
435
436void NuPlayer::GenericSource::notifyPreparedAndCleanup(status_t err) {
437    if (err != OK) {
438        mMetaDataSize = -1ll;
439        mContentType = "";
440        mSniffedMIME = "";
441        mDataSource.clear();
442        mCachedSource.clear();
443        mHttpSource.clear();
444
445        cancelPollBuffering();
446    }
447    notifyPrepared(err);
448}
449
450status_t NuPlayer::GenericSource::prefillCacheIfNecessary() {
451    CHECK(mDataSource != NULL);
452
453    if (mCachedSource == NULL) {
454        // no prefill if the data source is not cached
455        return OK;
456    }
457
458    // We're not doing this for streams that appear to be audio-only
459    // streams to ensure that even low bandwidth streams start
460    // playing back fairly instantly.
461    if (!strncasecmp(mContentType.string(), "audio/", 6)) {
462        return OK;
463    }
464
465    // We're going to prefill the cache before trying to instantiate
466    // the extractor below, as the latter is an operation that otherwise
467    // could block on the datasource for a significant amount of time.
468    // During that time we'd be unable to abort the preparation phase
469    // without this prefill.
470
471    // Initially make sure we have at least 192 KB for the sniff
472    // to complete without blocking.
473    static const size_t kMinBytesForSniffing = 192 * 1024;
474    static const size_t kDefaultMetaSize = 200000;
475
476    status_t finalStatus;
477
478    size_t cachedDataRemaining =
479            mCachedSource->approxDataRemaining(&finalStatus);
480
481    if (finalStatus != OK || (mMetaDataSize >= 0
482            && (off64_t)cachedDataRemaining >= mMetaDataSize)) {
483        ALOGV("stop caching, status %d, "
484                "metaDataSize %lld, cachedDataRemaining %zu",
485                finalStatus, mMetaDataSize, cachedDataRemaining);
486        return OK;
487    }
488
489    ALOGV("now cached %zu bytes of data", cachedDataRemaining);
490
491    if (mMetaDataSize < 0
492            && cachedDataRemaining >= kMinBytesForSniffing) {
493        String8 tmp;
494        float confidence;
495        sp<AMessage> meta;
496        if (!mCachedSource->sniff(&tmp, &confidence, &meta)) {
497            return UNKNOWN_ERROR;
498        }
499
500        // We successfully identified the file's extractor to
501        // be, remember this mime type so we don't have to
502        // sniff it again when we call MediaExtractor::Create()
503        mSniffedMIME = tmp.string();
504
505        if (meta == NULL
506                || !meta->findInt64("meta-data-size",
507                        reinterpret_cast<int64_t*>(&mMetaDataSize))) {
508            mMetaDataSize = kDefaultMetaSize;
509        }
510
511        if (mMetaDataSize < 0ll) {
512            ALOGE("invalid metaDataSize = %lld bytes", mMetaDataSize);
513            return UNKNOWN_ERROR;
514        }
515    }
516
517    return -EAGAIN;
518}
519
520void NuPlayer::GenericSource::start() {
521    ALOGI("start");
522
523    mStopRead = false;
524    if (mAudioTrack.mSource != NULL) {
525        postReadBuffer(MEDIA_TRACK_TYPE_AUDIO);
526    }
527
528    if (mVideoTrack.mSource != NULL) {
529        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
530    }
531
532    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
533    mStarted = true;
534
535    (new AMessage(kWhatStart, id()))->post();
536}
537
538void NuPlayer::GenericSource::stop() {
539    // nothing to do, just account for DRM playback status
540    setDrmPlaybackStatusIfNeeded(Playback::STOP, 0);
541    mStarted = false;
542    if (mIsWidevine || mIsSecure) {
543        // For widevine or secure sources we need to prevent any further reads.
544        sp<AMessage> msg = new AMessage(kWhatStopWidevine, id());
545        sp<AMessage> response;
546        (void) msg->postAndAwaitResponse(&response);
547    }
548}
549
550void NuPlayer::GenericSource::pause() {
551    // nothing to do, just account for DRM playback status
552    setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
553    mStarted = false;
554}
555
556void NuPlayer::GenericSource::resume() {
557    // nothing to do, just account for DRM playback status
558    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
559    mStarted = true;
560
561    (new AMessage(kWhatResume, id()))->post();
562}
563
564void NuPlayer::GenericSource::disconnect() {
565    if (mDataSource != NULL) {
566        // disconnect data source
567        if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
568            static_cast<NuCachedSource2 *>(mDataSource.get())->disconnect();
569        }
570    } else if (mHttpSource != NULL) {
571        static_cast<HTTPBase *>(mHttpSource.get())->disconnect();
572    }
573}
574
575void NuPlayer::GenericSource::setDrmPlaybackStatusIfNeeded(int playbackStatus, int64_t position) {
576    if (mDecryptHandle != NULL) {
577        mDrmManagerClient->setPlaybackStatus(mDecryptHandle, playbackStatus, position);
578    }
579    mSubtitleTrack.mPackets = new AnotherPacketSource(NULL);
580    mTimedTextTrack.mPackets = new AnotherPacketSource(NULL);
581}
582
583status_t NuPlayer::GenericSource::feedMoreTSData() {
584    return OK;
585}
586
587void NuPlayer::GenericSource::schedulePollBuffering() {
588    sp<AMessage> msg = new AMessage(kWhatPollBuffering, id());
589    msg->setInt32("generation", mPollBufferingGeneration);
590    msg->post(1000000ll);
591}
592
593void NuPlayer::GenericSource::cancelPollBuffering() {
594    mBuffering = false;
595    ++mPollBufferingGeneration;
596}
597
598void NuPlayer::GenericSource::restartPollBuffering() {
599    if (mIsStreaming) {
600        cancelPollBuffering();
601        onPollBuffering();
602    }
603}
604
605void NuPlayer::GenericSource::notifyBufferingUpdate(int percentage) {
606    ALOGV("notifyBufferingUpdate: buffering %d%%", percentage);
607
608    sp<AMessage> msg = dupNotify();
609    msg->setInt32("what", kWhatBufferingUpdate);
610    msg->setInt32("percentage", percentage);
611    msg->post();
612}
613
614void NuPlayer::GenericSource::startBufferingIfNecessary() {
615    ALOGV("startBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
616            mPrepareBuffering, mBuffering);
617
618    if (mPrepareBuffering) {
619        return;
620    }
621
622    if (!mBuffering) {
623        mBuffering = true;
624
625        ensureCacheIsFetching();
626        sendCacheStats();
627
628        sp<AMessage> notify = dupNotify();
629        notify->setInt32("what", kWhatPauseOnBufferingStart);
630        notify->post();
631    }
632}
633
634void NuPlayer::GenericSource::stopBufferingIfNecessary() {
635    ALOGV("stopBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
636            mPrepareBuffering, mBuffering);
637
638    if (mPrepareBuffering) {
639        mPrepareBuffering = false;
640        notifyPrepared();
641        return;
642    }
643
644    if (mBuffering) {
645        mBuffering = false;
646
647        sendCacheStats();
648
649        sp<AMessage> notify = dupNotify();
650        notify->setInt32("what", kWhatResumeOnBufferingEnd);
651        notify->post();
652    }
653}
654
655void NuPlayer::GenericSource::sendCacheStats() {
656    int32_t kbps = 0;
657    status_t err = UNKNOWN_ERROR;
658
659    if (mCachedSource != NULL) {
660        err = mCachedSource->getEstimatedBandwidthKbps(&kbps);
661    } else if (mWVMExtractor != NULL) {
662        err = mWVMExtractor->getEstimatedBandwidthKbps(&kbps);
663    }
664
665    if (err == OK) {
666        sp<AMessage> notify = dupNotify();
667        notify->setInt32("what", kWhatCacheStats);
668        notify->setInt32("bandwidth", kbps);
669        notify->post();
670    }
671}
672
673void NuPlayer::GenericSource::ensureCacheIsFetching() {
674    if (mCachedSource != NULL) {
675        mCachedSource->resumeFetchingIfNecessary();
676    }
677}
678
679void NuPlayer::GenericSource::onPollBuffering() {
680    status_t finalStatus = UNKNOWN_ERROR;
681    int64_t cachedDurationUs = -1ll;
682    ssize_t cachedDataRemaining = -1;
683
684    if (mCachedSource != NULL) {
685        cachedDataRemaining =
686                mCachedSource->approxDataRemaining(&finalStatus);
687
688        if (finalStatus == OK) {
689            off64_t size;
690            int64_t bitrate = 0ll;
691            if (mDurationUs > 0 && mCachedSource->getSize(&size) == OK) {
692                bitrate = size * 8000000ll / mDurationUs;
693            } else if (mBitrate > 0) {
694                bitrate = mBitrate;
695            }
696            if (bitrate > 0) {
697                cachedDurationUs = cachedDataRemaining * 8000000ll / bitrate;
698            }
699        }
700    } else if (mWVMExtractor != NULL) {
701        cachedDurationUs
702            = mWVMExtractor->getCachedDurationUs(&finalStatus);
703    }
704
705    if (finalStatus != OK) {
706        ALOGV("onPollBuffering: EOS (finalStatus = %d)", finalStatus);
707
708        if (finalStatus == ERROR_END_OF_STREAM) {
709            notifyBufferingUpdate(100);
710        }
711
712        stopBufferingIfNecessary();
713        return;
714    } else if (cachedDurationUs >= 0ll) {
715        if (mDurationUs > 0ll) {
716            int64_t cachedPosUs = getLastReadPosition() + cachedDurationUs;
717            int percentage = 100.0 * cachedPosUs / mDurationUs;
718            if (percentage > 100) {
719                percentage = 100;
720            }
721
722            notifyBufferingUpdate(percentage);
723        }
724
725        ALOGV("onPollBuffering: cachedDurationUs %.1f sec",
726                cachedDurationUs / 1000000.0f);
727
728        if (cachedDurationUs < kLowWaterMarkUs) {
729            startBufferingIfNecessary();
730        } else if (cachedDurationUs > kHighWaterMarkUs) {
731            stopBufferingIfNecessary();
732        }
733    } else if (cachedDataRemaining >= 0) {
734        ALOGV("onPollBuffering: cachedDataRemaining %d bytes",
735                cachedDataRemaining);
736
737        if (cachedDataRemaining < kLowWaterMarkBytes) {
738            startBufferingIfNecessary();
739        } else if (cachedDataRemaining > kHighWaterMarkBytes) {
740            stopBufferingIfNecessary();
741        }
742    }
743
744    schedulePollBuffering();
745}
746
747void NuPlayer::GenericSource::onMessageReceived(const sp<AMessage> &msg) {
748    switch (msg->what()) {
749      case kWhatPrepareAsync:
750      {
751          onPrepareAsync();
752          break;
753      }
754      case kWhatFetchSubtitleData:
755      {
756          fetchTextData(kWhatSendSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
757                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
758          break;
759      }
760
761      case kWhatFetchTimedTextData:
762      {
763          fetchTextData(kWhatSendTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
764                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
765          break;
766      }
767
768      case kWhatSendSubtitleData:
769      {
770          sendTextData(kWhatSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
771                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
772          break;
773      }
774
775      case kWhatSendTimedTextData:
776      {
777          sendTextData(kWhatTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
778                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
779          break;
780      }
781
782      case kWhatChangeAVSource:
783      {
784          int32_t trackIndex;
785          CHECK(msg->findInt32("trackIndex", &trackIndex));
786          const sp<MediaSource> source = mSources.itemAt(trackIndex);
787
788          Track* track;
789          const char *mime;
790          media_track_type trackType, counterpartType;
791          sp<MetaData> meta = source->getFormat();
792          meta->findCString(kKeyMIMEType, &mime);
793          if (!strncasecmp(mime, "audio/", 6)) {
794              track = &mAudioTrack;
795              trackType = MEDIA_TRACK_TYPE_AUDIO;
796              counterpartType = MEDIA_TRACK_TYPE_VIDEO;;
797          } else {
798              CHECK(!strncasecmp(mime, "video/", 6));
799              track = &mVideoTrack;
800              trackType = MEDIA_TRACK_TYPE_VIDEO;
801              counterpartType = MEDIA_TRACK_TYPE_AUDIO;;
802          }
803
804
805          if (track->mSource != NULL) {
806              track->mSource->stop();
807          }
808          track->mSource = source;
809          track->mSource->start();
810          track->mIndex = trackIndex;
811
812          int64_t timeUs, actualTimeUs;
813          const bool formatChange = true;
814          if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
815              timeUs = mAudioLastDequeueTimeUs;
816          } else {
817              timeUs = mVideoLastDequeueTimeUs;
818          }
819          readBuffer(trackType, timeUs, &actualTimeUs, formatChange);
820          readBuffer(counterpartType, -1, NULL, formatChange);
821          ALOGV("timeUs %lld actualTimeUs %lld", timeUs, actualTimeUs);
822
823          break;
824      }
825
826      case kWhatStart:
827      case kWhatResume:
828      {
829          restartPollBuffering();
830          break;
831      }
832
833      case kWhatPollBuffering:
834      {
835          int32_t generation;
836          CHECK(msg->findInt32("generation", &generation));
837          if (generation == mPollBufferingGeneration) {
838              onPollBuffering();
839          }
840          break;
841      }
842
843      case kWhatGetFormat:
844      {
845          onGetFormatMeta(msg);
846          break;
847      }
848
849      case kWhatGetSelectedTrack:
850      {
851          onGetSelectedTrack(msg);
852          break;
853      }
854
855      case kWhatSelectTrack:
856      {
857          onSelectTrack(msg);
858          break;
859      }
860
861      case kWhatSeek:
862      {
863          onSeek(msg);
864          break;
865      }
866
867      case kWhatReadBuffer:
868      {
869          onReadBuffer(msg);
870          break;
871      }
872
873      case kWhatStopWidevine:
874      {
875          // mStopRead is only used for Widevine to prevent the video source
876          // from being read while the associated video decoder is shutting down.
877          mStopRead = true;
878          if (mVideoTrack.mSource != NULL) {
879              mVideoTrack.mPackets->clear();
880          }
881          sp<AMessage> response = new AMessage;
882          uint32_t replyID;
883          CHECK(msg->senderAwaitsResponse(&replyID));
884          response->postReply(replyID);
885          break;
886      }
887      default:
888          Source::onMessageReceived(msg);
889          break;
890    }
891}
892
893void NuPlayer::GenericSource::fetchTextData(
894        uint32_t sendWhat,
895        media_track_type type,
896        int32_t curGen,
897        sp<AnotherPacketSource> packets,
898        sp<AMessage> msg) {
899    int32_t msgGeneration;
900    CHECK(msg->findInt32("generation", &msgGeneration));
901    if (msgGeneration != curGen) {
902        // stale
903        return;
904    }
905
906    int32_t avail;
907    if (packets->hasBufferAvailable(&avail)) {
908        return;
909    }
910
911    int64_t timeUs;
912    CHECK(msg->findInt64("timeUs", &timeUs));
913
914    int64_t subTimeUs;
915    readBuffer(type, timeUs, &subTimeUs);
916
917    int64_t delayUs = subTimeUs - timeUs;
918    if (msg->what() == kWhatFetchSubtitleData) {
919        const int64_t oneSecUs = 1000000ll;
920        delayUs -= oneSecUs;
921    }
922    sp<AMessage> msg2 = new AMessage(sendWhat, id());
923    msg2->setInt32("generation", msgGeneration);
924    msg2->post(delayUs < 0 ? 0 : delayUs);
925}
926
927void NuPlayer::GenericSource::sendTextData(
928        uint32_t what,
929        media_track_type type,
930        int32_t curGen,
931        sp<AnotherPacketSource> packets,
932        sp<AMessage> msg) {
933    int32_t msgGeneration;
934    CHECK(msg->findInt32("generation", &msgGeneration));
935    if (msgGeneration != curGen) {
936        // stale
937        return;
938    }
939
940    int64_t subTimeUs;
941    if (packets->nextBufferTime(&subTimeUs) != OK) {
942        return;
943    }
944
945    int64_t nextSubTimeUs;
946    readBuffer(type, -1, &nextSubTimeUs);
947
948    sp<ABuffer> buffer;
949    status_t dequeueStatus = packets->dequeueAccessUnit(&buffer);
950    if (dequeueStatus == OK) {
951        sp<AMessage> notify = dupNotify();
952        notify->setInt32("what", what);
953        notify->setBuffer("buffer", buffer);
954        notify->post();
955
956        const int64_t delayUs = nextSubTimeUs - subTimeUs;
957        msg->post(delayUs < 0 ? 0 : delayUs);
958    }
959}
960
961sp<MetaData> NuPlayer::GenericSource::getFormatMeta(bool audio) {
962    sp<AMessage> msg = new AMessage(kWhatGetFormat, id());
963    msg->setInt32("audio", audio);
964
965    sp<AMessage> response;
966    void *format;
967    status_t err = msg->postAndAwaitResponse(&response);
968    if (err == OK && response != NULL) {
969        CHECK(response->findPointer("format", &format));
970        return (MetaData *)format;
971    } else {
972        return NULL;
973    }
974}
975
976void NuPlayer::GenericSource::onGetFormatMeta(sp<AMessage> msg) const {
977    int32_t audio;
978    CHECK(msg->findInt32("audio", &audio));
979
980    sp<AMessage> response = new AMessage;
981    sp<MetaData> format = doGetFormatMeta(audio);
982    response->setPointer("format", format.get());
983
984    uint32_t replyID;
985    CHECK(msg->senderAwaitsResponse(&replyID));
986    response->postReply(replyID);
987}
988
989sp<MetaData> NuPlayer::GenericSource::doGetFormatMeta(bool audio) const {
990    sp<MediaSource> source = audio ? mAudioTrack.mSource : mVideoTrack.mSource;
991
992    if (source == NULL) {
993        return NULL;
994    }
995
996    return source->getFormat();
997}
998
999status_t NuPlayer::GenericSource::dequeueAccessUnit(
1000        bool audio, sp<ABuffer> *accessUnit) {
1001    Track *track = audio ? &mAudioTrack : &mVideoTrack;
1002
1003    if (track->mSource == NULL) {
1004        return -EWOULDBLOCK;
1005    }
1006
1007    if (mIsWidevine && !audio) {
1008        // try to read a buffer as we may not have been able to the last time
1009        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
1010    }
1011
1012    status_t finalResult;
1013    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
1014        if (finalResult == OK) {
1015            postReadBuffer(
1016                    audio ? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1017            return -EWOULDBLOCK;
1018        }
1019        return finalResult;
1020    }
1021
1022    status_t result = track->mPackets->dequeueAccessUnit(accessUnit);
1023
1024    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
1025        postReadBuffer(audio? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1026    }
1027
1028    if (result != OK) {
1029        if (mSubtitleTrack.mSource != NULL) {
1030            mSubtitleTrack.mPackets->clear();
1031            mFetchSubtitleDataGeneration++;
1032        }
1033        if (mTimedTextTrack.mSource != NULL) {
1034            mTimedTextTrack.mPackets->clear();
1035            mFetchTimedTextDataGeneration++;
1036        }
1037        return result;
1038    }
1039
1040    int64_t timeUs;
1041    status_t eosResult; // ignored
1042    CHECK((*accessUnit)->meta()->findInt64("timeUs", &timeUs));
1043    if (audio) {
1044        mAudioLastDequeueTimeUs = timeUs;
1045    } else {
1046        mVideoLastDequeueTimeUs = timeUs;
1047    }
1048
1049    if (mSubtitleTrack.mSource != NULL
1050            && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1051        sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, id());
1052        msg->setInt64("timeUs", timeUs);
1053        msg->setInt32("generation", mFetchSubtitleDataGeneration);
1054        msg->post();
1055    }
1056
1057    if (mTimedTextTrack.mSource != NULL
1058            && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1059        sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, id());
1060        msg->setInt64("timeUs", timeUs);
1061        msg->setInt32("generation", mFetchTimedTextDataGeneration);
1062        msg->post();
1063    }
1064
1065    return result;
1066}
1067
1068status_t NuPlayer::GenericSource::getDuration(int64_t *durationUs) {
1069    *durationUs = mDurationUs;
1070    return OK;
1071}
1072
1073size_t NuPlayer::GenericSource::getTrackCount() const {
1074    return mSources.size();
1075}
1076
1077sp<AMessage> NuPlayer::GenericSource::getTrackInfo(size_t trackIndex) const {
1078    size_t trackCount = mSources.size();
1079    if (trackIndex >= trackCount) {
1080        return NULL;
1081    }
1082
1083    sp<AMessage> format = new AMessage();
1084    sp<MetaData> meta = mSources.itemAt(trackIndex)->getFormat();
1085
1086    const char *mime;
1087    CHECK(meta->findCString(kKeyMIMEType, &mime));
1088
1089    int32_t trackType;
1090    if (!strncasecmp(mime, "video/", 6)) {
1091        trackType = MEDIA_TRACK_TYPE_VIDEO;
1092    } else if (!strncasecmp(mime, "audio/", 6)) {
1093        trackType = MEDIA_TRACK_TYPE_AUDIO;
1094    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP)) {
1095        trackType = MEDIA_TRACK_TYPE_TIMEDTEXT;
1096    } else {
1097        trackType = MEDIA_TRACK_TYPE_UNKNOWN;
1098    }
1099    format->setInt32("type", trackType);
1100
1101    const char *lang;
1102    if (!meta->findCString(kKeyMediaLanguage, &lang)) {
1103        lang = "und";
1104    }
1105    format->setString("language", lang);
1106
1107    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1108        format->setString("mime", mime);
1109
1110        int32_t isAutoselect = 1, isDefault = 0, isForced = 0;
1111        meta->findInt32(kKeyTrackIsAutoselect, &isAutoselect);
1112        meta->findInt32(kKeyTrackIsDefault, &isDefault);
1113        meta->findInt32(kKeyTrackIsForced, &isForced);
1114
1115        format->setInt32("auto", !!isAutoselect);
1116        format->setInt32("default", !!isDefault);
1117        format->setInt32("forced", !!isForced);
1118    }
1119
1120    return format;
1121}
1122
1123ssize_t NuPlayer::GenericSource::getSelectedTrack(media_track_type type) const {
1124    sp<AMessage> msg = new AMessage(kWhatGetSelectedTrack, id());
1125    msg->setInt32("type", type);
1126
1127    sp<AMessage> response;
1128    int32_t index;
1129    status_t err = msg->postAndAwaitResponse(&response);
1130    if (err == OK && response != NULL) {
1131        CHECK(response->findInt32("index", &index));
1132        return index;
1133    } else {
1134        return -1;
1135    }
1136}
1137
1138void NuPlayer::GenericSource::onGetSelectedTrack(sp<AMessage> msg) const {
1139    int32_t tmpType;
1140    CHECK(msg->findInt32("type", &tmpType));
1141    media_track_type type = (media_track_type)tmpType;
1142
1143    sp<AMessage> response = new AMessage;
1144    ssize_t index = doGetSelectedTrack(type);
1145    response->setInt32("index", index);
1146
1147    uint32_t replyID;
1148    CHECK(msg->senderAwaitsResponse(&replyID));
1149    response->postReply(replyID);
1150}
1151
1152ssize_t NuPlayer::GenericSource::doGetSelectedTrack(media_track_type type) const {
1153    const Track *track = NULL;
1154    switch (type) {
1155    case MEDIA_TRACK_TYPE_VIDEO:
1156        track = &mVideoTrack;
1157        break;
1158    case MEDIA_TRACK_TYPE_AUDIO:
1159        track = &mAudioTrack;
1160        break;
1161    case MEDIA_TRACK_TYPE_TIMEDTEXT:
1162        track = &mTimedTextTrack;
1163        break;
1164    case MEDIA_TRACK_TYPE_SUBTITLE:
1165        track = &mSubtitleTrack;
1166        break;
1167    default:
1168        break;
1169    }
1170
1171    if (track != NULL && track->mSource != NULL) {
1172        return track->mIndex;
1173    }
1174
1175    return -1;
1176}
1177
1178status_t NuPlayer::GenericSource::selectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1179    ALOGV("%s track: %zu", select ? "select" : "deselect", trackIndex);
1180    sp<AMessage> msg = new AMessage(kWhatSelectTrack, id());
1181    msg->setInt32("trackIndex", trackIndex);
1182    msg->setInt32("select", select);
1183    msg->setInt64("timeUs", timeUs);
1184
1185    sp<AMessage> response;
1186    status_t err = msg->postAndAwaitResponse(&response);
1187    if (err == OK && response != NULL) {
1188        CHECK(response->findInt32("err", &err));
1189    }
1190
1191    return err;
1192}
1193
1194void NuPlayer::GenericSource::onSelectTrack(sp<AMessage> msg) {
1195    int32_t trackIndex, select;
1196    int64_t timeUs;
1197    CHECK(msg->findInt32("trackIndex", &trackIndex));
1198    CHECK(msg->findInt32("select", &select));
1199    CHECK(msg->findInt64("timeUs", &timeUs));
1200
1201    sp<AMessage> response = new AMessage;
1202    status_t err = doSelectTrack(trackIndex, select, timeUs);
1203    response->setInt32("err", err);
1204
1205    uint32_t replyID;
1206    CHECK(msg->senderAwaitsResponse(&replyID));
1207    response->postReply(replyID);
1208}
1209
1210status_t NuPlayer::GenericSource::doSelectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1211    if (trackIndex >= mSources.size()) {
1212        return BAD_INDEX;
1213    }
1214
1215    if (!select) {
1216        Track* track = NULL;
1217        if (mSubtitleTrack.mSource != NULL && trackIndex == mSubtitleTrack.mIndex) {
1218            track = &mSubtitleTrack;
1219            mFetchSubtitleDataGeneration++;
1220        } else if (mTimedTextTrack.mSource != NULL && trackIndex == mTimedTextTrack.mIndex) {
1221            track = &mTimedTextTrack;
1222            mFetchTimedTextDataGeneration++;
1223        }
1224        if (track == NULL) {
1225            return INVALID_OPERATION;
1226        }
1227        track->mSource->stop();
1228        track->mSource = NULL;
1229        track->mPackets->clear();
1230        return OK;
1231    }
1232
1233    const sp<MediaSource> source = mSources.itemAt(trackIndex);
1234    sp<MetaData> meta = source->getFormat();
1235    const char *mime;
1236    CHECK(meta->findCString(kKeyMIMEType, &mime));
1237    if (!strncasecmp(mime, "text/", 5)) {
1238        bool isSubtitle = strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP);
1239        Track *track = isSubtitle ? &mSubtitleTrack : &mTimedTextTrack;
1240        if (track->mSource != NULL && track->mIndex == trackIndex) {
1241            return OK;
1242        }
1243        track->mIndex = trackIndex;
1244        if (track->mSource != NULL) {
1245            track->mSource->stop();
1246        }
1247        track->mSource = mSources.itemAt(trackIndex);
1248        track->mSource->start();
1249        if (track->mPackets == NULL) {
1250            track->mPackets = new AnotherPacketSource(track->mSource->getFormat());
1251        } else {
1252            track->mPackets->clear();
1253            track->mPackets->setFormat(track->mSource->getFormat());
1254
1255        }
1256
1257        if (isSubtitle) {
1258            mFetchSubtitleDataGeneration++;
1259        } else {
1260            mFetchTimedTextDataGeneration++;
1261        }
1262
1263        status_t eosResult; // ignored
1264        if (mSubtitleTrack.mSource != NULL
1265                && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1266            sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, id());
1267            msg->setInt64("timeUs", timeUs);
1268            msg->setInt32("generation", mFetchSubtitleDataGeneration);
1269            msg->post();
1270        }
1271
1272        if (mTimedTextTrack.mSource != NULL
1273                && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1274            sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, id());
1275            msg->setInt64("timeUs", timeUs);
1276            msg->setInt32("generation", mFetchTimedTextDataGeneration);
1277            msg->post();
1278        }
1279
1280        return OK;
1281    } else if (!strncasecmp(mime, "audio/", 6) || !strncasecmp(mime, "video/", 6)) {
1282        bool audio = !strncasecmp(mime, "audio/", 6);
1283        Track *track = audio ? &mAudioTrack : &mVideoTrack;
1284        if (track->mSource != NULL && track->mIndex == trackIndex) {
1285            return OK;
1286        }
1287
1288        sp<AMessage> msg = new AMessage(kWhatChangeAVSource, id());
1289        msg->setInt32("trackIndex", trackIndex);
1290        msg->post();
1291        return OK;
1292    }
1293
1294    return INVALID_OPERATION;
1295}
1296
1297status_t NuPlayer::GenericSource::seekTo(int64_t seekTimeUs) {
1298    sp<AMessage> msg = new AMessage(kWhatSeek, id());
1299    msg->setInt64("seekTimeUs", seekTimeUs);
1300
1301    sp<AMessage> response;
1302    status_t err = msg->postAndAwaitResponse(&response);
1303    if (err == OK && response != NULL) {
1304        CHECK(response->findInt32("err", &err));
1305    }
1306
1307    return err;
1308}
1309
1310void NuPlayer::GenericSource::onSeek(sp<AMessage> msg) {
1311    int64_t seekTimeUs;
1312    CHECK(msg->findInt64("seekTimeUs", &seekTimeUs));
1313
1314    sp<AMessage> response = new AMessage;
1315    status_t err = doSeek(seekTimeUs);
1316    response->setInt32("err", err);
1317
1318    uint32_t replyID;
1319    CHECK(msg->senderAwaitsResponse(&replyID));
1320    response->postReply(replyID);
1321}
1322
1323status_t NuPlayer::GenericSource::doSeek(int64_t seekTimeUs) {
1324    // If the Widevine source is stopped, do not attempt to read any
1325    // more buffers.
1326    if (mStopRead) {
1327        return INVALID_OPERATION;
1328    }
1329    if (mVideoTrack.mSource != NULL) {
1330        int64_t actualTimeUs;
1331        readBuffer(MEDIA_TRACK_TYPE_VIDEO, seekTimeUs, &actualTimeUs);
1332
1333        seekTimeUs = actualTimeUs;
1334        mVideoLastDequeueTimeUs = seekTimeUs;
1335    }
1336
1337    if (mAudioTrack.mSource != NULL) {
1338        readBuffer(MEDIA_TRACK_TYPE_AUDIO, seekTimeUs);
1339        mAudioLastDequeueTimeUs = seekTimeUs;
1340    }
1341
1342    setDrmPlaybackStatusIfNeeded(Playback::START, seekTimeUs / 1000);
1343    if (!mStarted) {
1344        setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
1345    }
1346
1347    // If currently buffering, post kWhatBufferingEnd first, so that
1348    // NuPlayer resumes. Otherwise, if cache hits high watermark
1349    // before new polling happens, no one will resume the playback.
1350    stopBufferingIfNecessary();
1351    restartPollBuffering();
1352
1353    return OK;
1354}
1355
1356sp<ABuffer> NuPlayer::GenericSource::mediaBufferToABuffer(
1357        MediaBuffer* mb,
1358        media_track_type trackType,
1359        int64_t /* seekTimeUs */,
1360        int64_t *actualTimeUs) {
1361    bool audio = trackType == MEDIA_TRACK_TYPE_AUDIO;
1362    size_t outLength = mb->range_length();
1363
1364    if (audio && mAudioIsVorbis) {
1365        outLength += sizeof(int32_t);
1366    }
1367
1368    sp<ABuffer> ab;
1369    if (mIsSecure && !audio) {
1370        // data is already provided in the buffer
1371        ab = new ABuffer(NULL, mb->range_length());
1372        mb->add_ref();
1373        ab->setMediaBufferBase(mb);
1374    } else {
1375        ab = new ABuffer(outLength);
1376        memcpy(ab->data(),
1377               (const uint8_t *)mb->data() + mb->range_offset(),
1378               mb->range_length());
1379    }
1380
1381    if (audio && mAudioIsVorbis) {
1382        int32_t numPageSamples;
1383        if (!mb->meta_data()->findInt32(kKeyValidSamples, &numPageSamples)) {
1384            numPageSamples = -1;
1385        }
1386
1387        uint8_t* abEnd = ab->data() + mb->range_length();
1388        memcpy(abEnd, &numPageSamples, sizeof(numPageSamples));
1389    }
1390
1391    sp<AMessage> meta = ab->meta();
1392
1393    int64_t timeUs;
1394    CHECK(mb->meta_data()->findInt64(kKeyTime, &timeUs));
1395    meta->setInt64("timeUs", timeUs);
1396
1397#if 0
1398    // Temporarily disable pre-roll till we have a full solution to handle
1399    // both single seek and continous seek gracefully.
1400    if (seekTimeUs > timeUs) {
1401        sp<AMessage> extra = new AMessage;
1402        extra->setInt64("resume-at-mediaTimeUs", seekTimeUs);
1403        meta->setMessage("extra", extra);
1404    }
1405#endif
1406
1407    if (trackType == MEDIA_TRACK_TYPE_TIMEDTEXT) {
1408        const char *mime;
1409        CHECK(mTimedTextTrack.mSource != NULL
1410                && mTimedTextTrack.mSource->getFormat()->findCString(kKeyMIMEType, &mime));
1411        meta->setString("mime", mime);
1412    }
1413
1414    int64_t durationUs;
1415    if (mb->meta_data()->findInt64(kKeyDuration, &durationUs)) {
1416        meta->setInt64("durationUs", durationUs);
1417    }
1418
1419    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1420        meta->setInt32("trackIndex", mSubtitleTrack.mIndex);
1421    }
1422
1423    if (actualTimeUs) {
1424        *actualTimeUs = timeUs;
1425    }
1426
1427    mb->release();
1428    mb = NULL;
1429
1430    return ab;
1431}
1432
1433void NuPlayer::GenericSource::postReadBuffer(media_track_type trackType) {
1434    Mutex::Autolock _l(mReadBufferLock);
1435
1436    if ((mPendingReadBufferTypes & (1 << trackType)) == 0) {
1437        mPendingReadBufferTypes |= (1 << trackType);
1438        sp<AMessage> msg = new AMessage(kWhatReadBuffer, id());
1439        msg->setInt32("trackType", trackType);
1440        msg->post();
1441    }
1442}
1443
1444void NuPlayer::GenericSource::onReadBuffer(sp<AMessage> msg) {
1445    int32_t tmpType;
1446    CHECK(msg->findInt32("trackType", &tmpType));
1447    media_track_type trackType = (media_track_type)tmpType;
1448    readBuffer(trackType);
1449    {
1450        // only protect the variable change, as readBuffer may
1451        // take considerable time.
1452        Mutex::Autolock _l(mReadBufferLock);
1453        mPendingReadBufferTypes &= ~(1 << trackType);
1454    }
1455}
1456
1457void NuPlayer::GenericSource::readBuffer(
1458        media_track_type trackType, int64_t seekTimeUs, int64_t *actualTimeUs, bool formatChange) {
1459    // Do not read data if Widevine source is stopped
1460    if (mStopRead) {
1461        return;
1462    }
1463    Track *track;
1464    size_t maxBuffers = 1;
1465    switch (trackType) {
1466        case MEDIA_TRACK_TYPE_VIDEO:
1467            track = &mVideoTrack;
1468            if (mIsWidevine) {
1469                maxBuffers = 2;
1470            }
1471            break;
1472        case MEDIA_TRACK_TYPE_AUDIO:
1473            track = &mAudioTrack;
1474            if (mIsWidevine) {
1475                maxBuffers = 8;
1476            } else {
1477                maxBuffers = 64;
1478            }
1479            break;
1480        case MEDIA_TRACK_TYPE_SUBTITLE:
1481            track = &mSubtitleTrack;
1482            break;
1483        case MEDIA_TRACK_TYPE_TIMEDTEXT:
1484            track = &mTimedTextTrack;
1485            break;
1486        default:
1487            TRESPASS();
1488    }
1489
1490    if (track->mSource == NULL) {
1491        return;
1492    }
1493
1494    if (actualTimeUs) {
1495        *actualTimeUs = seekTimeUs;
1496    }
1497
1498    MediaSource::ReadOptions options;
1499
1500    bool seeking = false;
1501
1502    if (seekTimeUs >= 0) {
1503        options.setSeekTo(seekTimeUs, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
1504        seeking = true;
1505    }
1506
1507    if (mIsWidevine) {
1508        options.setNonBlocking();
1509    }
1510
1511    for (size_t numBuffers = 0; numBuffers < maxBuffers; ) {
1512        MediaBuffer *mbuf;
1513        status_t err = track->mSource->read(&mbuf, &options);
1514
1515        options.clearSeekTo();
1516
1517        if (err == OK) {
1518            int64_t timeUs;
1519            CHECK(mbuf->meta_data()->findInt64(kKeyTime, &timeUs));
1520            if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
1521                mAudioTimeUs = timeUs;
1522            } else if (trackType == MEDIA_TRACK_TYPE_VIDEO) {
1523                mVideoTimeUs = timeUs;
1524            }
1525
1526            // formatChange && seeking: track whose source is changed during selection
1527            // formatChange && !seeking: track whose source is not changed during selection
1528            // !formatChange: normal seek
1529            if ((seeking || formatChange)
1530                    && (trackType == MEDIA_TRACK_TYPE_AUDIO
1531                    || trackType == MEDIA_TRACK_TYPE_VIDEO)) {
1532                ATSParser::DiscontinuityType type = (formatChange && seeking)
1533                        ? ATSParser::DISCONTINUITY_FORMATCHANGE
1534                        : ATSParser::DISCONTINUITY_NONE;
1535                track->mPackets->queueDiscontinuity( type, NULL, true /* discard */);
1536            }
1537
1538            sp<ABuffer> buffer = mediaBufferToABuffer(
1539                    mbuf, trackType, seekTimeUs, actualTimeUs);
1540            track->mPackets->queueAccessUnit(buffer);
1541            formatChange = false;
1542            seeking = false;
1543            ++numBuffers;
1544        } else if (err == WOULD_BLOCK) {
1545            break;
1546        } else if (err == INFO_FORMAT_CHANGED) {
1547#if 0
1548            track->mPackets->queueDiscontinuity(
1549                    ATSParser::DISCONTINUITY_FORMATCHANGE,
1550                    NULL,
1551                    false /* discard */);
1552#endif
1553        } else {
1554            track->mPackets->signalEOS(err);
1555            break;
1556        }
1557    }
1558}
1559
1560}  // namespace android
1561