GenericSource.cpp revision 02cb98d726b97d8e6dbb9c6c60d32a3cedc7f82d 
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      mBitrate(-1ll),
69      mPollBufferingGeneration(0),
70      mPendingReadBufferTypes(0),
71      mBuffering(false),
72      mPrepareBuffering(false),
73      mPrevBufferPercentage(-1) {
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
127status_t NuPlayer::GenericSource::setDataSource(const sp<DataSource>& source) {
128    resetDataSource();
129    mDataSource = source;
130    return OK;
131}
132
133sp<MetaData> NuPlayer::GenericSource::getFileFormatMeta() const {
134    return mFileMeta;
135}
136
137status_t NuPlayer::GenericSource::initFromDataSource() {
138    sp<MediaExtractor> extractor;
139    String8 mimeType;
140    float confidence;
141    sp<AMessage> dummy;
142    bool isWidevineStreaming = false;
143
144    CHECK(mDataSource != NULL);
145
146    if (mIsWidevine) {
147        isWidevineStreaming = SniffWVM(
148                mDataSource, &mimeType, &confidence, &dummy);
149        if (!isWidevineStreaming ||
150                strcasecmp(
151                    mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM)) {
152            ALOGE("unsupported widevine mime: %s", mimeType.string());
153            return UNKNOWN_ERROR;
154        }
155    } else if (mIsStreaming) {
156        if (!mDataSource->sniff(&mimeType, &confidence, &dummy)) {
157            return UNKNOWN_ERROR;
158        }
159        isWidevineStreaming = !strcasecmp(
160                mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM);
161    }
162
163    if (isWidevineStreaming) {
164        // we don't want cached source for widevine streaming.
165        mCachedSource.clear();
166        mDataSource = mHttpSource;
167        mWVMExtractor = new WVMExtractor(mDataSource);
168        mWVMExtractor->setAdaptiveStreamingMode(true);
169        if (mUIDValid) {
170            mWVMExtractor->setUID(mUID);
171        }
172        extractor = mWVMExtractor;
173    } else {
174        extractor = MediaExtractor::Create(mDataSource,
175                mimeType.isEmpty() ? NULL : mimeType.string());
176    }
177
178    if (extractor == NULL) {
179        return UNKNOWN_ERROR;
180    }
181
182    if (extractor->getDrmFlag()) {
183        checkDrmStatus(mDataSource);
184    }
185
186    mFileMeta = extractor->getMetaData();
187    if (mFileMeta != NULL) {
188        int64_t duration;
189        if (mFileMeta->findInt64(kKeyDuration, &duration)) {
190            mDurationUs = duration;
191        }
192
193        if (!mIsWidevine) {
194            // Check mime to see if we actually have a widevine source.
195            // If the data source is not URL-type (eg. file source), we
196            // won't be able to tell until now.
197            const char *fileMime;
198            if (mFileMeta->findCString(kKeyMIMEType, &fileMime)
199                    && !strncasecmp(fileMime, "video/wvm", 9)) {
200                mIsWidevine = true;
201            }
202        }
203    }
204
205    int32_t totalBitrate = 0;
206
207    size_t numtracks = extractor->countTracks();
208    if (numtracks == 0) {
209        return UNKNOWN_ERROR;
210    }
211
212    for (size_t i = 0; i < numtracks; ++i) {
213        sp<MediaSource> track = extractor->getTrack(i);
214
215        sp<MetaData> meta = extractor->getTrackMetaData(i);
216
217        const char *mime;
218        CHECK(meta->findCString(kKeyMIMEType, &mime));
219
220        // Do the string compare immediately with "mime",
221        // we can't assume "mime" would stay valid after another
222        // extractor operation, some extractors might modify meta
223        // during getTrack() and make it invalid.
224        if (!strncasecmp(mime, "audio/", 6)) {
225            if (mAudioTrack.mSource == NULL) {
226                mAudioTrack.mIndex = i;
227                mAudioTrack.mSource = track;
228                mAudioTrack.mPackets =
229                    new AnotherPacketSource(mAudioTrack.mSource->getFormat());
230
231                if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_VORBIS)) {
232                    mAudioIsVorbis = true;
233                } else {
234                    mAudioIsVorbis = false;
235                }
236            }
237        } else if (!strncasecmp(mime, "video/", 6)) {
238            if (mVideoTrack.mSource == NULL) {
239                mVideoTrack.mIndex = i;
240                mVideoTrack.mSource = track;
241                mVideoTrack.mPackets =
242                    new AnotherPacketSource(mVideoTrack.mSource->getFormat());
243
244                // check if the source requires secure buffers
245                int32_t secure;
246                if (meta->findInt32(kKeyRequiresSecureBuffers, &secure)
247                        && secure) {
248                    mIsSecure = true;
249                    if (mUIDValid) {
250                        extractor->setUID(mUID);
251                    }
252                }
253            }
254        }
255
256        if (track != NULL) {
257            mSources.push(track);
258            int64_t durationUs;
259            if (meta->findInt64(kKeyDuration, &durationUs)) {
260                if (durationUs > mDurationUs) {
261                    mDurationUs = durationUs;
262                }
263            }
264
265            int32_t bitrate;
266            if (totalBitrate >= 0 && meta->findInt32(kKeyBitRate, &bitrate)) {
267                totalBitrate += bitrate;
268            } else {
269                totalBitrate = -1;
270            }
271        }
272    }
273
274    mBitrate = totalBitrate;
275
276    return OK;
277}
278
279status_t NuPlayer::GenericSource::startSources() {
280    // Start the selected A/V tracks now before we start buffering.
281    // Widevine sources might re-initialize crypto when starting, if we delay
282    // this to start(), all data buffered during prepare would be wasted.
283    // (We don't actually start reading until start().)
284    if (mAudioTrack.mSource != NULL && mAudioTrack.mSource->start() != OK) {
285        ALOGE("failed to start audio track!");
286        return UNKNOWN_ERROR;
287    }
288
289    if (mVideoTrack.mSource != NULL && mVideoTrack.mSource->start() != OK) {
290        ALOGE("failed to start video track!");
291        return UNKNOWN_ERROR;
292    }
293
294    return OK;
295}
296
297void NuPlayer::GenericSource::checkDrmStatus(const sp<DataSource>& dataSource) {
298    dataSource->getDrmInfo(mDecryptHandle, &mDrmManagerClient);
299    if (mDecryptHandle != NULL) {
300        CHECK(mDrmManagerClient);
301        if (RightsStatus::RIGHTS_VALID != mDecryptHandle->status) {
302            sp<AMessage> msg = dupNotify();
303            msg->setInt32("what", kWhatDrmNoLicense);
304            msg->post();
305        }
306    }
307}
308
309int64_t NuPlayer::GenericSource::getLastReadPosition() {
310    if (mAudioTrack.mSource != NULL) {
311        return mAudioTimeUs;
312    } else if (mVideoTrack.mSource != NULL) {
313        return mVideoTimeUs;
314    } else {
315        return 0;
316    }
317}
318
319status_t NuPlayer::GenericSource::setBuffers(
320        bool audio, Vector<MediaBuffer *> &buffers) {
321    if (mIsSecure && !audio) {
322        return mVideoTrack.mSource->setBuffers(buffers);
323    }
324    return INVALID_OPERATION;
325}
326
327bool NuPlayer::GenericSource::isStreaming() const {
328    return mIsStreaming;
329}
330
331NuPlayer::GenericSource::~GenericSource() {
332    if (mLooper != NULL) {
333        mLooper->unregisterHandler(id());
334        mLooper->stop();
335    }
336    resetDataSource();
337}
338
339void NuPlayer::GenericSource::prepareAsync() {
340    if (mLooper == NULL) {
341        mLooper = new ALooper;
342        mLooper->setName("generic");
343        mLooper->start();
344
345        mLooper->registerHandler(this);
346    }
347
348    sp<AMessage> msg = new AMessage(kWhatPrepareAsync, this);
349    msg->post();
350}
351
352void NuPlayer::GenericSource::onPrepareAsync() {
353    // delayed data source creation
354    if (mDataSource == NULL) {
355        // set to false first, if the extractor
356        // comes back as secure, set it to true then.
357        mIsSecure = false;
358
359        if (!mUri.empty()) {
360            const char* uri = mUri.c_str();
361            String8 contentType;
362            mIsWidevine = !strncasecmp(uri, "widevine://", 11);
363
364            if (!strncasecmp("http://", uri, 7)
365                    || !strncasecmp("https://", uri, 8)
366                    || mIsWidevine) {
367                mHttpSource = DataSource::CreateMediaHTTP(mHTTPService);
368                if (mHttpSource == NULL) {
369                    ALOGE("Failed to create http source!");
370                    notifyPreparedAndCleanup(UNKNOWN_ERROR);
371                    return;
372                }
373            }
374
375            mDataSource = DataSource::CreateFromURI(
376                   mHTTPService, uri, &mUriHeaders, &contentType,
377                   static_cast<HTTPBase *>(mHttpSource.get()));
378        } else {
379            mIsWidevine = false;
380
381            mDataSource = new FileSource(mFd, mOffset, mLength);
382            mFd = -1;
383        }
384
385        if (mDataSource == NULL) {
386            ALOGE("Failed to create data source!");
387            notifyPreparedAndCleanup(UNKNOWN_ERROR);
388            return;
389        }
390    }
391
392    if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
393        mCachedSource = static_cast<NuCachedSource2 *>(mDataSource.get());
394    }
395
396    // For widevine or other cached streaming cases, we need to wait for
397    // enough buffering before reporting prepared.
398    // Note that even when URL doesn't start with widevine://, mIsWidevine
399    // could still be set to true later, if the streaming or file source
400    // is sniffed to be widevine. We don't want to buffer for file source
401    // in that case, so must check the flag now.
402    mIsStreaming = (mIsWidevine || mCachedSource != NULL);
403
404    // init extractor from data source
405    status_t err = initFromDataSource();
406
407    if (err != OK) {
408        ALOGE("Failed to init from data source!");
409        notifyPreparedAndCleanup(err);
410        return;
411    }
412
413    if (mVideoTrack.mSource != NULL) {
414        sp<MetaData> meta = doGetFormatMeta(false /* audio */);
415        sp<AMessage> msg = new AMessage;
416        err = convertMetaDataToMessage(meta, &msg);
417        if(err != OK) {
418            notifyPreparedAndCleanup(err);
419            return;
420        }
421        notifyVideoSizeChanged(msg);
422    }
423
424    notifyFlagsChanged(
425            (mIsSecure ? FLAG_SECURE : 0)
426            | (mDecryptHandle != NULL ? FLAG_PROTECTED : 0)
427            | FLAG_CAN_PAUSE
428            | FLAG_CAN_SEEK_BACKWARD
429            | FLAG_CAN_SEEK_FORWARD
430            | FLAG_CAN_SEEK);
431
432    if (mIsSecure) {
433        // secure decoders must be instantiated before starting widevine source
434        sp<AMessage> reply = new AMessage(kWhatSecureDecodersInstantiated, this);
435        notifyInstantiateSecureDecoders(reply);
436    } else {
437        finishPrepareAsync();
438    }
439}
440
441void NuPlayer::GenericSource::onSecureDecodersInstantiated(status_t err) {
442    if (err != OK) {
443        ALOGE("Failed to instantiate secure decoders!");
444        notifyPreparedAndCleanup(err);
445        return;
446    }
447    finishPrepareAsync();
448}
449
450void NuPlayer::GenericSource::finishPrepareAsync() {
451    status_t err = startSources();
452    if (err != OK) {
453        ALOGE("Failed to init start data source!");
454        notifyPreparedAndCleanup(err);
455        return;
456    }
457
458    if (mIsStreaming) {
459        mPrepareBuffering = true;
460
461        ensureCacheIsFetching();
462        restartPollBuffering();
463    } else {
464        notifyPrepared();
465    }
466}
467
468void NuPlayer::GenericSource::notifyPreparedAndCleanup(status_t err) {
469    if (err != OK) {
470        mDataSource.clear();
471        mCachedSource.clear();
472        mHttpSource.clear();
473        mBitrate = -1;
474
475        cancelPollBuffering();
476    }
477    notifyPrepared(err);
478}
479
480void NuPlayer::GenericSource::start() {
481    ALOGI("start");
482
483    mStopRead = false;
484    if (mAudioTrack.mSource != NULL) {
485        postReadBuffer(MEDIA_TRACK_TYPE_AUDIO);
486    }
487
488    if (mVideoTrack.mSource != NULL) {
489        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
490    }
491
492    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
493    mStarted = true;
494
495    (new AMessage(kWhatStart, this))->post();
496}
497
498void NuPlayer::GenericSource::stop() {
499    // nothing to do, just account for DRM playback status
500    setDrmPlaybackStatusIfNeeded(Playback::STOP, 0);
501    mStarted = false;
502    if (mIsWidevine || mIsSecure) {
503        // For widevine or secure sources we need to prevent any further reads.
504        sp<AMessage> msg = new AMessage(kWhatStopWidevine, this);
505        sp<AMessage> response;
506        (void) msg->postAndAwaitResponse(&response);
507    }
508}
509
510void NuPlayer::GenericSource::pause() {
511    // nothing to do, just account for DRM playback status
512    setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
513    mStarted = false;
514}
515
516void NuPlayer::GenericSource::resume() {
517    // nothing to do, just account for DRM playback status
518    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
519    mStarted = true;
520
521    (new AMessage(kWhatResume, this))->post();
522}
523
524void NuPlayer::GenericSource::disconnect() {
525    if (mDataSource != NULL) {
526        // disconnect data source
527        if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
528            static_cast<NuCachedSource2 *>(mDataSource.get())->disconnect();
529        }
530    } else if (mHttpSource != NULL) {
531        static_cast<HTTPBase *>(mHttpSource.get())->disconnect();
532    }
533}
534
535void NuPlayer::GenericSource::setDrmPlaybackStatusIfNeeded(int playbackStatus, int64_t position) {
536    if (mDecryptHandle != NULL) {
537        mDrmManagerClient->setPlaybackStatus(mDecryptHandle, playbackStatus, position);
538    }
539    mSubtitleTrack.mPackets = new AnotherPacketSource(NULL);
540    mTimedTextTrack.mPackets = new AnotherPacketSource(NULL);
541}
542
543status_t NuPlayer::GenericSource::feedMoreTSData() {
544    return OK;
545}
546
547void NuPlayer::GenericSource::schedulePollBuffering() {
548    sp<AMessage> msg = new AMessage(kWhatPollBuffering, this);
549    msg->setInt32("generation", mPollBufferingGeneration);
550    msg->post(1000000ll);
551}
552
553void NuPlayer::GenericSource::cancelPollBuffering() {
554    mBuffering = false;
555    ++mPollBufferingGeneration;
556    mPrevBufferPercentage = -1;
557}
558
559void NuPlayer::GenericSource::restartPollBuffering() {
560    if (mIsStreaming) {
561        cancelPollBuffering();
562        onPollBuffering();
563    }
564}
565
566void NuPlayer::GenericSource::notifyBufferingUpdate(int32_t percentage) {
567    // Buffering percent could go backward as it's estimated from remaining
568    // data and last access time. This could cause the buffering position
569    // drawn on media control to jitter slightly. Remember previously reported
570    // percentage and don't allow it to go backward.
571    if (percentage < mPrevBufferPercentage) {
572        percentage = mPrevBufferPercentage;
573    } else if (percentage > 100) {
574        percentage = 100;
575    }
576
577    mPrevBufferPercentage = percentage;
578
579    ALOGV("notifyBufferingUpdate: buffering %d%%", percentage);
580
581    sp<AMessage> msg = dupNotify();
582    msg->setInt32("what", kWhatBufferingUpdate);
583    msg->setInt32("percentage", percentage);
584    msg->post();
585}
586
587void NuPlayer::GenericSource::startBufferingIfNecessary() {
588    ALOGV("startBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
589            mPrepareBuffering, mBuffering);
590
591    if (mPrepareBuffering) {
592        return;
593    }
594
595    if (!mBuffering) {
596        mBuffering = true;
597
598        ensureCacheIsFetching();
599        sendCacheStats();
600
601        sp<AMessage> notify = dupNotify();
602        notify->setInt32("what", kWhatPauseOnBufferingStart);
603        notify->post();
604    }
605}
606
607void NuPlayer::GenericSource::stopBufferingIfNecessary() {
608    ALOGV("stopBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
609            mPrepareBuffering, mBuffering);
610
611    if (mPrepareBuffering) {
612        mPrepareBuffering = false;
613        notifyPrepared();
614        return;
615    }
616
617    if (mBuffering) {
618        mBuffering = false;
619
620        sendCacheStats();
621
622        sp<AMessage> notify = dupNotify();
623        notify->setInt32("what", kWhatResumeOnBufferingEnd);
624        notify->post();
625    }
626}
627
628void NuPlayer::GenericSource::sendCacheStats() {
629    int32_t kbps = 0;
630    status_t err = UNKNOWN_ERROR;
631
632    if (mWVMExtractor != NULL) {
633        err = mWVMExtractor->getEstimatedBandwidthKbps(&kbps);
634    } else if (mCachedSource != NULL) {
635        err = mCachedSource->getEstimatedBandwidthKbps(&kbps);
636    }
637
638    if (err == OK) {
639        sp<AMessage> notify = dupNotify();
640        notify->setInt32("what", kWhatCacheStats);
641        notify->setInt32("bandwidth", kbps);
642        notify->post();
643    }
644}
645
646void NuPlayer::GenericSource::ensureCacheIsFetching() {
647    if (mCachedSource != NULL) {
648        mCachedSource->resumeFetchingIfNecessary();
649    }
650}
651
652void NuPlayer::GenericSource::onPollBuffering() {
653    status_t finalStatus = UNKNOWN_ERROR;
654    int64_t cachedDurationUs = -1ll;
655    ssize_t cachedDataRemaining = -1;
656
657    ALOGW_IF(mWVMExtractor != NULL && mCachedSource != NULL,
658            "WVMExtractor and NuCachedSource both present");
659
660    if (mWVMExtractor != NULL) {
661        cachedDurationUs =
662                mWVMExtractor->getCachedDurationUs(&finalStatus);
663    } else if (mCachedSource != NULL) {
664        cachedDataRemaining =
665                mCachedSource->approxDataRemaining(&finalStatus);
666
667        if (finalStatus == OK) {
668            off64_t size;
669            int64_t bitrate = 0ll;
670            if (mDurationUs > 0 && mCachedSource->getSize(&size) == OK) {
671                bitrate = size * 8000000ll / mDurationUs;
672            } else if (mBitrate > 0) {
673                bitrate = mBitrate;
674            }
675            if (bitrate > 0) {
676                cachedDurationUs = cachedDataRemaining * 8000000ll / bitrate;
677            }
678        }
679    }
680
681    if (finalStatus != OK) {
682        ALOGV("onPollBuffering: EOS (finalStatus = %d)", finalStatus);
683
684        if (finalStatus == ERROR_END_OF_STREAM) {
685            notifyBufferingUpdate(100);
686        }
687
688        stopBufferingIfNecessary();
689        return;
690    } else if (cachedDurationUs >= 0ll) {
691        if (mDurationUs > 0ll) {
692            int64_t cachedPosUs = getLastReadPosition() + cachedDurationUs;
693            int percentage = 100.0 * cachedPosUs / mDurationUs;
694            if (percentage > 100) {
695                percentage = 100;
696            }
697
698            notifyBufferingUpdate(percentage);
699        }
700
701        ALOGV("onPollBuffering: cachedDurationUs %.1f sec",
702                cachedDurationUs / 1000000.0f);
703
704        if (cachedDurationUs < kLowWaterMarkUs) {
705            startBufferingIfNecessary();
706        } else if (cachedDurationUs > kHighWaterMarkUs) {
707            stopBufferingIfNecessary();
708        }
709    } else if (cachedDataRemaining >= 0) {
710        ALOGV("onPollBuffering: cachedDataRemaining %zd bytes",
711                cachedDataRemaining);
712
713        if (cachedDataRemaining < kLowWaterMarkBytes) {
714            startBufferingIfNecessary();
715        } else if (cachedDataRemaining > kHighWaterMarkBytes) {
716            stopBufferingIfNecessary();
717        }
718    }
719
720    schedulePollBuffering();
721}
722
723void NuPlayer::GenericSource::onMessageReceived(const sp<AMessage> &msg) {
724    switch (msg->what()) {
725      case kWhatPrepareAsync:
726      {
727          onPrepareAsync();
728          break;
729      }
730      case kWhatFetchSubtitleData:
731      {
732          fetchTextData(kWhatSendSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
733                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
734          break;
735      }
736
737      case kWhatFetchTimedTextData:
738      {
739          fetchTextData(kWhatSendTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
740                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
741          break;
742      }
743
744      case kWhatSendSubtitleData:
745      {
746          sendTextData(kWhatSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
747                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
748          break;
749      }
750
751      case kWhatSendTimedTextData:
752      {
753          sendTextData(kWhatTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
754                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
755          break;
756      }
757
758      case kWhatChangeAVSource:
759      {
760          int32_t trackIndex;
761          CHECK(msg->findInt32("trackIndex", &trackIndex));
762          const sp<MediaSource> source = mSources.itemAt(trackIndex);
763
764          Track* track;
765          const char *mime;
766          media_track_type trackType, counterpartType;
767          sp<MetaData> meta = source->getFormat();
768          meta->findCString(kKeyMIMEType, &mime);
769          if (!strncasecmp(mime, "audio/", 6)) {
770              track = &mAudioTrack;
771              trackType = MEDIA_TRACK_TYPE_AUDIO;
772              counterpartType = MEDIA_TRACK_TYPE_VIDEO;;
773          } else {
774              CHECK(!strncasecmp(mime, "video/", 6));
775              track = &mVideoTrack;
776              trackType = MEDIA_TRACK_TYPE_VIDEO;
777              counterpartType = MEDIA_TRACK_TYPE_AUDIO;;
778          }
779
780
781          if (track->mSource != NULL) {
782              track->mSource->stop();
783          }
784          track->mSource = source;
785          track->mSource->start();
786          track->mIndex = trackIndex;
787
788          int64_t timeUs, actualTimeUs;
789          const bool formatChange = true;
790          if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
791              timeUs = mAudioLastDequeueTimeUs;
792          } else {
793              timeUs = mVideoLastDequeueTimeUs;
794          }
795          readBuffer(trackType, timeUs, &actualTimeUs, formatChange);
796          readBuffer(counterpartType, -1, NULL, formatChange);
797          ALOGV("timeUs %lld actualTimeUs %lld", (long long)timeUs, (long long)actualTimeUs);
798
799          break;
800      }
801
802      case kWhatStart:
803      case kWhatResume:
804      {
805          restartPollBuffering();
806          break;
807      }
808
809      case kWhatPollBuffering:
810      {
811          int32_t generation;
812          CHECK(msg->findInt32("generation", &generation));
813          if (generation == mPollBufferingGeneration) {
814              onPollBuffering();
815          }
816          break;
817      }
818
819      case kWhatGetFormat:
820      {
821          onGetFormatMeta(msg);
822          break;
823      }
824
825      case kWhatGetSelectedTrack:
826      {
827          onGetSelectedTrack(msg);
828          break;
829      }
830
831      case kWhatSelectTrack:
832      {
833          onSelectTrack(msg);
834          break;
835      }
836
837      case kWhatSeek:
838      {
839          onSeek(msg);
840          break;
841      }
842
843      case kWhatReadBuffer:
844      {
845          onReadBuffer(msg);
846          break;
847      }
848
849      case kWhatSecureDecodersInstantiated:
850      {
851          int32_t err;
852          CHECK(msg->findInt32("err", &err));
853          onSecureDecodersInstantiated(err);
854          break;
855      }
856
857      case kWhatStopWidevine:
858      {
859          // mStopRead is only used for Widevine to prevent the video source
860          // from being read while the associated video decoder is shutting down.
861          mStopRead = true;
862          if (mVideoTrack.mSource != NULL) {
863              mVideoTrack.mPackets->clear();
864          }
865          sp<AMessage> response = new AMessage;
866          sp<AReplyToken> replyID;
867          CHECK(msg->senderAwaitsResponse(&replyID));
868          response->postReply(replyID);
869          break;
870      }
871      default:
872          Source::onMessageReceived(msg);
873          break;
874    }
875}
876
877void NuPlayer::GenericSource::fetchTextData(
878        uint32_t sendWhat,
879        media_track_type type,
880        int32_t curGen,
881        sp<AnotherPacketSource> packets,
882        sp<AMessage> msg) {
883    int32_t msgGeneration;
884    CHECK(msg->findInt32("generation", &msgGeneration));
885    if (msgGeneration != curGen) {
886        // stale
887        return;
888    }
889
890    int32_t avail;
891    if (packets->hasBufferAvailable(&avail)) {
892        return;
893    }
894
895    int64_t timeUs;
896    CHECK(msg->findInt64("timeUs", &timeUs));
897
898    int64_t subTimeUs;
899    readBuffer(type, timeUs, &subTimeUs);
900
901    int64_t delayUs = subTimeUs - timeUs;
902    if (msg->what() == kWhatFetchSubtitleData) {
903        const int64_t oneSecUs = 1000000ll;
904        delayUs -= oneSecUs;
905    }
906    sp<AMessage> msg2 = new AMessage(sendWhat, this);
907    msg2->setInt32("generation", msgGeneration);
908    msg2->post(delayUs < 0 ? 0 : delayUs);
909}
910
911void NuPlayer::GenericSource::sendTextData(
912        uint32_t what,
913        media_track_type type,
914        int32_t curGen,
915        sp<AnotherPacketSource> packets,
916        sp<AMessage> msg) {
917    int32_t msgGeneration;
918    CHECK(msg->findInt32("generation", &msgGeneration));
919    if (msgGeneration != curGen) {
920        // stale
921        return;
922    }
923
924    int64_t subTimeUs;
925    if (packets->nextBufferTime(&subTimeUs) != OK) {
926        return;
927    }
928
929    int64_t nextSubTimeUs;
930    readBuffer(type, -1, &nextSubTimeUs);
931
932    sp<ABuffer> buffer;
933    status_t dequeueStatus = packets->dequeueAccessUnit(&buffer);
934    if (dequeueStatus == OK) {
935        sp<AMessage> notify = dupNotify();
936        notify->setInt32("what", what);
937        notify->setBuffer("buffer", buffer);
938        notify->post();
939
940        const int64_t delayUs = nextSubTimeUs - subTimeUs;
941        msg->post(delayUs < 0 ? 0 : delayUs);
942    }
943}
944
945sp<MetaData> NuPlayer::GenericSource::getFormatMeta(bool audio) {
946    sp<AMessage> msg = new AMessage(kWhatGetFormat, this);
947    msg->setInt32("audio", audio);
948
949    sp<AMessage> response;
950    void *format;
951    status_t err = msg->postAndAwaitResponse(&response);
952    if (err == OK && response != NULL) {
953        CHECK(response->findPointer("format", &format));
954        return (MetaData *)format;
955    } else {
956        return NULL;
957    }
958}
959
960void NuPlayer::GenericSource::onGetFormatMeta(sp<AMessage> msg) const {
961    int32_t audio;
962    CHECK(msg->findInt32("audio", &audio));
963
964    sp<AMessage> response = new AMessage;
965    sp<MetaData> format = doGetFormatMeta(audio);
966    response->setPointer("format", format.get());
967
968    sp<AReplyToken> replyID;
969    CHECK(msg->senderAwaitsResponse(&replyID));
970    response->postReply(replyID);
971}
972
973sp<MetaData> NuPlayer::GenericSource::doGetFormatMeta(bool audio) const {
974    sp<MediaSource> source = audio ? mAudioTrack.mSource : mVideoTrack.mSource;
975
976    if (source == NULL) {
977        return NULL;
978    }
979
980    return source->getFormat();
981}
982
983status_t NuPlayer::GenericSource::dequeueAccessUnit(
984        bool audio, sp<ABuffer> *accessUnit) {
985    Track *track = audio ? &mAudioTrack : &mVideoTrack;
986
987    if (track->mSource == NULL) {
988        return -EWOULDBLOCK;
989    }
990
991    if (mIsWidevine && !audio) {
992        // try to read a buffer as we may not have been able to the last time
993        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
994    }
995
996    status_t finalResult;
997    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
998        if (finalResult == OK) {
999            postReadBuffer(
1000                    audio ? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1001            return -EWOULDBLOCK;
1002        }
1003        return finalResult;
1004    }
1005
1006    status_t result = track->mPackets->dequeueAccessUnit(accessUnit);
1007
1008    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
1009        postReadBuffer(audio? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1010    }
1011
1012    if (result != OK) {
1013        if (mSubtitleTrack.mSource != NULL) {
1014            mSubtitleTrack.mPackets->clear();
1015            mFetchSubtitleDataGeneration++;
1016        }
1017        if (mTimedTextTrack.mSource != NULL) {
1018            mTimedTextTrack.mPackets->clear();
1019            mFetchTimedTextDataGeneration++;
1020        }
1021        return result;
1022    }
1023
1024    int64_t timeUs;
1025    status_t eosResult; // ignored
1026    CHECK((*accessUnit)->meta()->findInt64("timeUs", &timeUs));
1027    if (audio) {
1028        mAudioLastDequeueTimeUs = timeUs;
1029    } else {
1030        mVideoLastDequeueTimeUs = timeUs;
1031    }
1032
1033    if (mSubtitleTrack.mSource != NULL
1034            && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1035        sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
1036        msg->setInt64("timeUs", timeUs);
1037        msg->setInt32("generation", mFetchSubtitleDataGeneration);
1038        msg->post();
1039    }
1040
1041    if (mTimedTextTrack.mSource != NULL
1042            && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1043        sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
1044        msg->setInt64("timeUs", timeUs);
1045        msg->setInt32("generation", mFetchTimedTextDataGeneration);
1046        msg->post();
1047    }
1048
1049    return result;
1050}
1051
1052status_t NuPlayer::GenericSource::getDuration(int64_t *durationUs) {
1053    *durationUs = mDurationUs;
1054    return OK;
1055}
1056
1057size_t NuPlayer::GenericSource::getTrackCount() const {
1058    return mSources.size();
1059}
1060
1061sp<AMessage> NuPlayer::GenericSource::getTrackInfo(size_t trackIndex) const {
1062    size_t trackCount = mSources.size();
1063    if (trackIndex >= trackCount) {
1064        return NULL;
1065    }
1066
1067    sp<AMessage> format = new AMessage();
1068    sp<MetaData> meta = mSources.itemAt(trackIndex)->getFormat();
1069
1070    const char *mime;
1071    CHECK(meta->findCString(kKeyMIMEType, &mime));
1072    format->setString("mime", mime);
1073
1074    int32_t trackType;
1075    if (!strncasecmp(mime, "video/", 6)) {
1076        trackType = MEDIA_TRACK_TYPE_VIDEO;
1077    } else if (!strncasecmp(mime, "audio/", 6)) {
1078        trackType = MEDIA_TRACK_TYPE_AUDIO;
1079    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP)) {
1080        trackType = MEDIA_TRACK_TYPE_TIMEDTEXT;
1081    } else {
1082        trackType = MEDIA_TRACK_TYPE_UNKNOWN;
1083    }
1084    format->setInt32("type", trackType);
1085
1086    const char *lang;
1087    if (!meta->findCString(kKeyMediaLanguage, &lang)) {
1088        lang = "und";
1089    }
1090    format->setString("language", lang);
1091
1092    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1093        int32_t isAutoselect = 1, isDefault = 0, isForced = 0;
1094        meta->findInt32(kKeyTrackIsAutoselect, &isAutoselect);
1095        meta->findInt32(kKeyTrackIsDefault, &isDefault);
1096        meta->findInt32(kKeyTrackIsForced, &isForced);
1097
1098        format->setInt32("auto", !!isAutoselect);
1099        format->setInt32("default", !!isDefault);
1100        format->setInt32("forced", !!isForced);
1101    }
1102
1103    return format;
1104}
1105
1106ssize_t NuPlayer::GenericSource::getSelectedTrack(media_track_type type) const {
1107    sp<AMessage> msg = new AMessage(kWhatGetSelectedTrack, this);
1108    msg->setInt32("type", type);
1109
1110    sp<AMessage> response;
1111    int32_t index;
1112    status_t err = msg->postAndAwaitResponse(&response);
1113    if (err == OK && response != NULL) {
1114        CHECK(response->findInt32("index", &index));
1115        return index;
1116    } else {
1117        return -1;
1118    }
1119}
1120
1121void NuPlayer::GenericSource::onGetSelectedTrack(sp<AMessage> msg) const {
1122    int32_t tmpType;
1123    CHECK(msg->findInt32("type", &tmpType));
1124    media_track_type type = (media_track_type)tmpType;
1125
1126    sp<AMessage> response = new AMessage;
1127    ssize_t index = doGetSelectedTrack(type);
1128    response->setInt32("index", index);
1129
1130    sp<AReplyToken> replyID;
1131    CHECK(msg->senderAwaitsResponse(&replyID));
1132    response->postReply(replyID);
1133}
1134
1135ssize_t NuPlayer::GenericSource::doGetSelectedTrack(media_track_type type) const {
1136    const Track *track = NULL;
1137    switch (type) {
1138    case MEDIA_TRACK_TYPE_VIDEO:
1139        track = &mVideoTrack;
1140        break;
1141    case MEDIA_TRACK_TYPE_AUDIO:
1142        track = &mAudioTrack;
1143        break;
1144    case MEDIA_TRACK_TYPE_TIMEDTEXT:
1145        track = &mTimedTextTrack;
1146        break;
1147    case MEDIA_TRACK_TYPE_SUBTITLE:
1148        track = &mSubtitleTrack;
1149        break;
1150    default:
1151        break;
1152    }
1153
1154    if (track != NULL && track->mSource != NULL) {
1155        return track->mIndex;
1156    }
1157
1158    return -1;
1159}
1160
1161status_t NuPlayer::GenericSource::selectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1162    ALOGV("%s track: %zu", select ? "select" : "deselect", trackIndex);
1163    sp<AMessage> msg = new AMessage(kWhatSelectTrack, this);
1164    msg->setInt32("trackIndex", trackIndex);
1165    msg->setInt32("select", select);
1166    msg->setInt64("timeUs", timeUs);
1167
1168    sp<AMessage> response;
1169    status_t err = msg->postAndAwaitResponse(&response);
1170    if (err == OK && response != NULL) {
1171        CHECK(response->findInt32("err", &err));
1172    }
1173
1174    return err;
1175}
1176
1177void NuPlayer::GenericSource::onSelectTrack(sp<AMessage> msg) {
1178    int32_t trackIndex, select;
1179    int64_t timeUs;
1180    CHECK(msg->findInt32("trackIndex", &trackIndex));
1181    CHECK(msg->findInt32("select", &select));
1182    CHECK(msg->findInt64("timeUs", &timeUs));
1183
1184    sp<AMessage> response = new AMessage;
1185    status_t err = doSelectTrack(trackIndex, select, timeUs);
1186    response->setInt32("err", err);
1187
1188    sp<AReplyToken> replyID;
1189    CHECK(msg->senderAwaitsResponse(&replyID));
1190    response->postReply(replyID);
1191}
1192
1193status_t NuPlayer::GenericSource::doSelectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1194    if (trackIndex >= mSources.size()) {
1195        return BAD_INDEX;
1196    }
1197
1198    if (!select) {
1199        Track* track = NULL;
1200        if (mSubtitleTrack.mSource != NULL && trackIndex == mSubtitleTrack.mIndex) {
1201            track = &mSubtitleTrack;
1202            mFetchSubtitleDataGeneration++;
1203        } else if (mTimedTextTrack.mSource != NULL && trackIndex == mTimedTextTrack.mIndex) {
1204            track = &mTimedTextTrack;
1205            mFetchTimedTextDataGeneration++;
1206        }
1207        if (track == NULL) {
1208            return INVALID_OPERATION;
1209        }
1210        track->mSource->stop();
1211        track->mSource = NULL;
1212        track->mPackets->clear();
1213        return OK;
1214    }
1215
1216    const sp<MediaSource> source = mSources.itemAt(trackIndex);
1217    sp<MetaData> meta = source->getFormat();
1218    const char *mime;
1219    CHECK(meta->findCString(kKeyMIMEType, &mime));
1220    if (!strncasecmp(mime, "text/", 5)) {
1221        bool isSubtitle = strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP);
1222        Track *track = isSubtitle ? &mSubtitleTrack : &mTimedTextTrack;
1223        if (track->mSource != NULL && track->mIndex == trackIndex) {
1224            return OK;
1225        }
1226        track->mIndex = trackIndex;
1227        if (track->mSource != NULL) {
1228            track->mSource->stop();
1229        }
1230        track->mSource = mSources.itemAt(trackIndex);
1231        track->mSource->start();
1232        if (track->mPackets == NULL) {
1233            track->mPackets = new AnotherPacketSource(track->mSource->getFormat());
1234        } else {
1235            track->mPackets->clear();
1236            track->mPackets->setFormat(track->mSource->getFormat());
1237
1238        }
1239
1240        if (isSubtitle) {
1241            mFetchSubtitleDataGeneration++;
1242        } else {
1243            mFetchTimedTextDataGeneration++;
1244        }
1245
1246        status_t eosResult; // ignored
1247        if (mSubtitleTrack.mSource != NULL
1248                && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1249            sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
1250            msg->setInt64("timeUs", timeUs);
1251            msg->setInt32("generation", mFetchSubtitleDataGeneration);
1252            msg->post();
1253        }
1254
1255        if (mTimedTextTrack.mSource != NULL
1256                && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1257            sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
1258            msg->setInt64("timeUs", timeUs);
1259            msg->setInt32("generation", mFetchTimedTextDataGeneration);
1260            msg->post();
1261        }
1262
1263        return OK;
1264    } else if (!strncasecmp(mime, "audio/", 6) || !strncasecmp(mime, "video/", 6)) {
1265        bool audio = !strncasecmp(mime, "audio/", 6);
1266        Track *track = audio ? &mAudioTrack : &mVideoTrack;
1267        if (track->mSource != NULL && track->mIndex == trackIndex) {
1268            return OK;
1269        }
1270
1271        sp<AMessage> msg = new AMessage(kWhatChangeAVSource, this);
1272        msg->setInt32("trackIndex", trackIndex);
1273        msg->post();
1274        return OK;
1275    }
1276
1277    return INVALID_OPERATION;
1278}
1279
1280status_t NuPlayer::GenericSource::seekTo(int64_t seekTimeUs) {
1281    sp<AMessage> msg = new AMessage(kWhatSeek, this);
1282    msg->setInt64("seekTimeUs", seekTimeUs);
1283
1284    sp<AMessage> response;
1285    status_t err = msg->postAndAwaitResponse(&response);
1286    if (err == OK && response != NULL) {
1287        CHECK(response->findInt32("err", &err));
1288    }
1289
1290    return err;
1291}
1292
1293void NuPlayer::GenericSource::onSeek(sp<AMessage> msg) {
1294    int64_t seekTimeUs;
1295    CHECK(msg->findInt64("seekTimeUs", &seekTimeUs));
1296
1297    sp<AMessage> response = new AMessage;
1298    status_t err = doSeek(seekTimeUs);
1299    response->setInt32("err", err);
1300
1301    sp<AReplyToken> replyID;
1302    CHECK(msg->senderAwaitsResponse(&replyID));
1303    response->postReply(replyID);
1304}
1305
1306status_t NuPlayer::GenericSource::doSeek(int64_t seekTimeUs) {
1307    // If the Widevine source is stopped, do not attempt to read any
1308    // more buffers.
1309    if (mStopRead) {
1310        return INVALID_OPERATION;
1311    }
1312    if (mVideoTrack.mSource != NULL) {
1313        int64_t actualTimeUs;
1314        readBuffer(MEDIA_TRACK_TYPE_VIDEO, seekTimeUs, &actualTimeUs);
1315
1316        seekTimeUs = actualTimeUs;
1317        mVideoLastDequeueTimeUs = seekTimeUs;
1318    }
1319
1320    if (mAudioTrack.mSource != NULL) {
1321        readBuffer(MEDIA_TRACK_TYPE_AUDIO, seekTimeUs);
1322        mAudioLastDequeueTimeUs = seekTimeUs;
1323    }
1324
1325    setDrmPlaybackStatusIfNeeded(Playback::START, seekTimeUs / 1000);
1326    if (!mStarted) {
1327        setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
1328    }
1329
1330    // If currently buffering, post kWhatBufferingEnd first, so that
1331    // NuPlayer resumes. Otherwise, if cache hits high watermark
1332    // before new polling happens, no one will resume the playback.
1333    stopBufferingIfNecessary();
1334    restartPollBuffering();
1335
1336    return OK;
1337}
1338
1339sp<ABuffer> NuPlayer::GenericSource::mediaBufferToABuffer(
1340        MediaBuffer* mb,
1341        media_track_type trackType,
1342        int64_t /* seekTimeUs */,
1343        int64_t *actualTimeUs) {
1344    bool audio = trackType == MEDIA_TRACK_TYPE_AUDIO;
1345    size_t outLength = mb->range_length();
1346
1347    if (audio && mAudioIsVorbis) {
1348        outLength += sizeof(int32_t);
1349    }
1350
1351    sp<ABuffer> ab;
1352    if (mIsSecure && !audio) {
1353        // data is already provided in the buffer
1354        ab = new ABuffer(NULL, mb->range_length());
1355        mb->add_ref();
1356        ab->setMediaBufferBase(mb);
1357    } else {
1358        ab = new ABuffer(outLength);
1359        memcpy(ab->data(),
1360               (const uint8_t *)mb->data() + mb->range_offset(),
1361               mb->range_length());
1362    }
1363
1364    if (audio && mAudioIsVorbis) {
1365        int32_t numPageSamples;
1366        if (!mb->meta_data()->findInt32(kKeyValidSamples, &numPageSamples)) {
1367            numPageSamples = -1;
1368        }
1369
1370        uint8_t* abEnd = ab->data() + mb->range_length();
1371        memcpy(abEnd, &numPageSamples, sizeof(numPageSamples));
1372    }
1373
1374    sp<AMessage> meta = ab->meta();
1375
1376    int64_t timeUs;
1377    CHECK(mb->meta_data()->findInt64(kKeyTime, &timeUs));
1378    meta->setInt64("timeUs", timeUs);
1379
1380#if 0
1381    // Temporarily disable pre-roll till we have a full solution to handle
1382    // both single seek and continous seek gracefully.
1383    if (seekTimeUs > timeUs) {
1384        sp<AMessage> extra = new AMessage;
1385        extra->setInt64("resume-at-mediaTimeUs", seekTimeUs);
1386        meta->setMessage("extra", extra);
1387    }
1388#endif
1389
1390    if (trackType == MEDIA_TRACK_TYPE_TIMEDTEXT) {
1391        const char *mime;
1392        CHECK(mTimedTextTrack.mSource != NULL
1393                && mTimedTextTrack.mSource->getFormat()->findCString(kKeyMIMEType, &mime));
1394        meta->setString("mime", mime);
1395    }
1396
1397    int64_t durationUs;
1398    if (mb->meta_data()->findInt64(kKeyDuration, &durationUs)) {
1399        meta->setInt64("durationUs", durationUs);
1400    }
1401
1402    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1403        meta->setInt32("trackIndex", mSubtitleTrack.mIndex);
1404    }
1405
1406    uint32_t dataType; // unused
1407    const void *seiData;
1408    size_t seiLength;
1409    if (mb->meta_data()->findData(kKeySEI, &dataType, &seiData, &seiLength)) {
1410        sp<ABuffer> sei = ABuffer::CreateAsCopy(seiData, seiLength);;
1411        meta->setBuffer("sei", sei);
1412    }
1413
1414    if (actualTimeUs) {
1415        *actualTimeUs = timeUs;
1416    }
1417
1418    mb->release();
1419    mb = NULL;
1420
1421    return ab;
1422}
1423
1424void NuPlayer::GenericSource::postReadBuffer(media_track_type trackType) {
1425    Mutex::Autolock _l(mReadBufferLock);
1426
1427    if ((mPendingReadBufferTypes & (1 << trackType)) == 0) {
1428        mPendingReadBufferTypes |= (1 << trackType);
1429        sp<AMessage> msg = new AMessage(kWhatReadBuffer, this);
1430        msg->setInt32("trackType", trackType);
1431        msg->post();
1432    }
1433}
1434
1435void NuPlayer::GenericSource::onReadBuffer(sp<AMessage> msg) {
1436    int32_t tmpType;
1437    CHECK(msg->findInt32("trackType", &tmpType));
1438    media_track_type trackType = (media_track_type)tmpType;
1439    readBuffer(trackType);
1440    {
1441        // only protect the variable change, as readBuffer may
1442        // take considerable time.
1443        Mutex::Autolock _l(mReadBufferLock);
1444        mPendingReadBufferTypes &= ~(1 << trackType);
1445    }
1446}
1447
1448void NuPlayer::GenericSource::readBuffer(
1449        media_track_type trackType, int64_t seekTimeUs, int64_t *actualTimeUs, bool formatChange) {
1450    // Do not read data if Widevine source is stopped
1451    if (mStopRead) {
1452        return;
1453    }
1454    Track *track;
1455    size_t maxBuffers = 1;
1456    switch (trackType) {
1457        case MEDIA_TRACK_TYPE_VIDEO:
1458            track = &mVideoTrack;
1459            if (mIsWidevine) {
1460                maxBuffers = 2;
1461            }
1462            break;
1463        case MEDIA_TRACK_TYPE_AUDIO:
1464            track = &mAudioTrack;
1465            if (mIsWidevine) {
1466                maxBuffers = 8;
1467            } else {
1468                maxBuffers = 64;
1469            }
1470            break;
1471        case MEDIA_TRACK_TYPE_SUBTITLE:
1472            track = &mSubtitleTrack;
1473            break;
1474        case MEDIA_TRACK_TYPE_TIMEDTEXT:
1475            track = &mTimedTextTrack;
1476            break;
1477        default:
1478            TRESPASS();
1479    }
1480
1481    if (track->mSource == NULL) {
1482        return;
1483    }
1484
1485    if (actualTimeUs) {
1486        *actualTimeUs = seekTimeUs;
1487    }
1488
1489    MediaSource::ReadOptions options;
1490
1491    bool seeking = false;
1492
1493    if (seekTimeUs >= 0) {
1494        options.setSeekTo(seekTimeUs, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
1495        seeking = true;
1496    }
1497
1498    if (mIsWidevine) {
1499        options.setNonBlocking();
1500    }
1501
1502    for (size_t numBuffers = 0; numBuffers < maxBuffers; ) {
1503        MediaBuffer *mbuf;
1504        status_t err = track->mSource->read(&mbuf, &options);
1505
1506        options.clearSeekTo();
1507
1508        if (err == OK) {
1509            int64_t timeUs;
1510            CHECK(mbuf->meta_data()->findInt64(kKeyTime, &timeUs));
1511            if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
1512                mAudioTimeUs = timeUs;
1513            } else if (trackType == MEDIA_TRACK_TYPE_VIDEO) {
1514                mVideoTimeUs = timeUs;
1515            }
1516
1517            queueDiscontinuityIfNeeded(seeking, formatChange, trackType, track);
1518
1519            sp<ABuffer> buffer = mediaBufferToABuffer(
1520                    mbuf, trackType, seekTimeUs, actualTimeUs);
1521            track->mPackets->queueAccessUnit(buffer);
1522            formatChange = false;
1523            seeking = false;
1524            ++numBuffers;
1525        } else if (err == WOULD_BLOCK) {
1526            break;
1527        } else if (err == INFO_FORMAT_CHANGED) {
1528#if 0
1529            track->mPackets->queueDiscontinuity(
1530                    ATSParser::DISCONTINUITY_FORMATCHANGE,
1531                    NULL,
1532                    false /* discard */);
1533#endif
1534        } else {
1535            queueDiscontinuityIfNeeded(seeking, formatChange, trackType, track);
1536            track->mPackets->signalEOS(err);
1537            break;
1538        }
1539    }
1540}
1541
1542void NuPlayer::GenericSource::queueDiscontinuityIfNeeded(
1543        bool seeking, bool formatChange, media_track_type trackType, Track *track) {
1544    // formatChange && seeking: track whose source is changed during selection
1545    // formatChange && !seeking: track whose source is not changed during selection
1546    // !formatChange: normal seek
1547    if ((seeking || formatChange)
1548            && (trackType == MEDIA_TRACK_TYPE_AUDIO
1549            || trackType == MEDIA_TRACK_TYPE_VIDEO)) {
1550        ATSParser::DiscontinuityType type = (formatChange && seeking)
1551                ? ATSParser::DISCONTINUITY_FORMATCHANGE
1552                : ATSParser::DISCONTINUITY_NONE;
1553        track->mPackets->queueDiscontinuity(type, NULL /* extra */, true /* discard */);
1554    }
1555}
1556
1557}  // namespace android
1558