GenericSource.cpp revision 55e2f4ca5bb23ce32fbdd627b0f648c27106b98e 
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(-1ll),
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 kWhatSendGlobalTimedTextData:
752      {
753          sendGlobalTextData(kWhatTimedTextData, mFetchTimedTextDataGeneration, msg);
754          break;
755      }
756      case kWhatSendTimedTextData:
757      {
758          sendTextData(kWhatTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
759                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
760          break;
761      }
762
763      case kWhatChangeAVSource:
764      {
765          int32_t trackIndex;
766          CHECK(msg->findInt32("trackIndex", &trackIndex));
767          const sp<MediaSource> source = mSources.itemAt(trackIndex);
768
769          Track* track;
770          const char *mime;
771          media_track_type trackType, counterpartType;
772          sp<MetaData> meta = source->getFormat();
773          meta->findCString(kKeyMIMEType, &mime);
774          if (!strncasecmp(mime, "audio/", 6)) {
775              track = &mAudioTrack;
776              trackType = MEDIA_TRACK_TYPE_AUDIO;
777              counterpartType = MEDIA_TRACK_TYPE_VIDEO;;
778          } else {
779              CHECK(!strncasecmp(mime, "video/", 6));
780              track = &mVideoTrack;
781              trackType = MEDIA_TRACK_TYPE_VIDEO;
782              counterpartType = MEDIA_TRACK_TYPE_AUDIO;;
783          }
784
785
786          if (track->mSource != NULL) {
787              track->mSource->stop();
788          }
789          track->mSource = source;
790          track->mSource->start();
791          track->mIndex = trackIndex;
792
793          int64_t timeUs, actualTimeUs;
794          const bool formatChange = true;
795          if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
796              timeUs = mAudioLastDequeueTimeUs;
797          } else {
798              timeUs = mVideoLastDequeueTimeUs;
799          }
800          readBuffer(trackType, timeUs, &actualTimeUs, formatChange);
801          readBuffer(counterpartType, -1, NULL, formatChange);
802          ALOGV("timeUs %lld actualTimeUs %lld", (long long)timeUs, (long long)actualTimeUs);
803
804          break;
805      }
806
807      case kWhatStart:
808      case kWhatResume:
809      {
810          restartPollBuffering();
811          break;
812      }
813
814      case kWhatPollBuffering:
815      {
816          int32_t generation;
817          CHECK(msg->findInt32("generation", &generation));
818          if (generation == mPollBufferingGeneration) {
819              onPollBuffering();
820          }
821          break;
822      }
823
824      case kWhatGetFormat:
825      {
826          onGetFormatMeta(msg);
827          break;
828      }
829
830      case kWhatGetSelectedTrack:
831      {
832          onGetSelectedTrack(msg);
833          break;
834      }
835
836      case kWhatSelectTrack:
837      {
838          onSelectTrack(msg);
839          break;
840      }
841
842      case kWhatSeek:
843      {
844          onSeek(msg);
845          break;
846      }
847
848      case kWhatReadBuffer:
849      {
850          onReadBuffer(msg);
851          break;
852      }
853
854      case kWhatSecureDecodersInstantiated:
855      {
856          int32_t err;
857          CHECK(msg->findInt32("err", &err));
858          onSecureDecodersInstantiated(err);
859          break;
860      }
861
862      case kWhatStopWidevine:
863      {
864          // mStopRead is only used for Widevine to prevent the video source
865          // from being read while the associated video decoder is shutting down.
866          mStopRead = true;
867          if (mVideoTrack.mSource != NULL) {
868              mVideoTrack.mPackets->clear();
869          }
870          sp<AMessage> response = new AMessage;
871          sp<AReplyToken> replyID;
872          CHECK(msg->senderAwaitsResponse(&replyID));
873          response->postReply(replyID);
874          break;
875      }
876      default:
877          Source::onMessageReceived(msg);
878          break;
879    }
880}
881
882void NuPlayer::GenericSource::fetchTextData(
883        uint32_t sendWhat,
884        media_track_type type,
885        int32_t curGen,
886        sp<AnotherPacketSource> packets,
887        sp<AMessage> msg) {
888    int32_t msgGeneration;
889    CHECK(msg->findInt32("generation", &msgGeneration));
890    if (msgGeneration != curGen) {
891        // stale
892        return;
893    }
894
895    int32_t avail;
896    if (packets->hasBufferAvailable(&avail)) {
897        return;
898    }
899
900    int64_t timeUs;
901    CHECK(msg->findInt64("timeUs", &timeUs));
902
903    int64_t subTimeUs;
904    readBuffer(type, timeUs, &subTimeUs);
905
906    int64_t delayUs = subTimeUs - timeUs;
907    if (msg->what() == kWhatFetchSubtitleData) {
908        const int64_t oneSecUs = 1000000ll;
909        delayUs -= oneSecUs;
910    }
911    sp<AMessage> msg2 = new AMessage(sendWhat, this);
912    msg2->setInt32("generation", msgGeneration);
913    msg2->post(delayUs < 0 ? 0 : delayUs);
914}
915
916void NuPlayer::GenericSource::sendTextData(
917        uint32_t what,
918        media_track_type type,
919        int32_t curGen,
920        sp<AnotherPacketSource> packets,
921        sp<AMessage> msg) {
922    int32_t msgGeneration;
923    CHECK(msg->findInt32("generation", &msgGeneration));
924    if (msgGeneration != curGen) {
925        // stale
926        return;
927    }
928
929    int64_t subTimeUs;
930    if (packets->nextBufferTime(&subTimeUs) != OK) {
931        return;
932    }
933
934    int64_t nextSubTimeUs;
935    readBuffer(type, -1, &nextSubTimeUs);
936
937    sp<ABuffer> buffer;
938    status_t dequeueStatus = packets->dequeueAccessUnit(&buffer);
939    if (dequeueStatus == OK) {
940        sp<AMessage> notify = dupNotify();
941        notify->setInt32("what", what);
942        notify->setBuffer("buffer", buffer);
943        notify->post();
944
945        const int64_t delayUs = nextSubTimeUs - subTimeUs;
946        msg->post(delayUs < 0 ? 0 : delayUs);
947    }
948}
949
950void NuPlayer::GenericSource::sendGlobalTextData(
951        uint32_t what,
952        int32_t curGen,
953        sp<AMessage> msg) {
954    int32_t msgGeneration;
955    CHECK(msg->findInt32("generation", &msgGeneration));
956    if (msgGeneration != curGen) {
957        // stale
958        return;
959    }
960
961    uint32_t textType;
962    const void *data;
963    size_t size = 0;
964    if (mTimedTextTrack.mSource->getFormat()->findData(
965                    kKeyTextFormatData, &textType, &data, &size)) {
966        mGlobalTimedText = new ABuffer(size);
967        if (mGlobalTimedText->data()) {
968            memcpy(mGlobalTimedText->data(), data, size);
969            sp<AMessage> globalMeta = mGlobalTimedText->meta();
970            globalMeta->setInt64("timeUs", 0);
971            globalMeta->setString("mime", MEDIA_MIMETYPE_TEXT_3GPP);
972            globalMeta->setInt32("global", 1);
973            sp<AMessage> notify = dupNotify();
974            notify->setInt32("what", what);
975            notify->setBuffer("buffer", mGlobalTimedText);
976            notify->post();
977        }
978    }
979}
980
981sp<MetaData> NuPlayer::GenericSource::getFormatMeta(bool audio) {
982    sp<AMessage> msg = new AMessage(kWhatGetFormat, this);
983    msg->setInt32("audio", audio);
984
985    sp<AMessage> response;
986    void *format;
987    status_t err = msg->postAndAwaitResponse(&response);
988    if (err == OK && response != NULL) {
989        CHECK(response->findPointer("format", &format));
990        return (MetaData *)format;
991    } else {
992        return NULL;
993    }
994}
995
996void NuPlayer::GenericSource::onGetFormatMeta(sp<AMessage> msg) const {
997    int32_t audio;
998    CHECK(msg->findInt32("audio", &audio));
999
1000    sp<AMessage> response = new AMessage;
1001    sp<MetaData> format = doGetFormatMeta(audio);
1002    response->setPointer("format", format.get());
1003
1004    sp<AReplyToken> replyID;
1005    CHECK(msg->senderAwaitsResponse(&replyID));
1006    response->postReply(replyID);
1007}
1008
1009sp<MetaData> NuPlayer::GenericSource::doGetFormatMeta(bool audio) const {
1010    sp<MediaSource> source = audio ? mAudioTrack.mSource : mVideoTrack.mSource;
1011
1012    if (source == NULL) {
1013        return NULL;
1014    }
1015
1016    return source->getFormat();
1017}
1018
1019status_t NuPlayer::GenericSource::dequeueAccessUnit(
1020        bool audio, sp<ABuffer> *accessUnit) {
1021    Track *track = audio ? &mAudioTrack : &mVideoTrack;
1022
1023    if (track->mSource == NULL) {
1024        return -EWOULDBLOCK;
1025    }
1026
1027    if (mIsWidevine && !audio) {
1028        // try to read a buffer as we may not have been able to the last time
1029        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
1030    }
1031
1032    status_t finalResult;
1033    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
1034        if (finalResult == OK) {
1035            postReadBuffer(
1036                    audio ? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1037            return -EWOULDBLOCK;
1038        }
1039        return finalResult;
1040    }
1041
1042    status_t result = track->mPackets->dequeueAccessUnit(accessUnit);
1043
1044    // start pulling in more buffers if we only have one (or no) buffer left
1045    // so that decoder has less chance of being starved
1046    if (track->mPackets->getAvailableBufferCount(&finalResult) < 2) {
1047        postReadBuffer(audio? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1048    }
1049
1050    if (result != OK) {
1051        if (mSubtitleTrack.mSource != NULL) {
1052            mSubtitleTrack.mPackets->clear();
1053            mFetchSubtitleDataGeneration++;
1054        }
1055        if (mTimedTextTrack.mSource != NULL) {
1056            mTimedTextTrack.mPackets->clear();
1057            mFetchTimedTextDataGeneration++;
1058        }
1059        return result;
1060    }
1061
1062    int64_t timeUs;
1063    status_t eosResult; // ignored
1064    CHECK((*accessUnit)->meta()->findInt64("timeUs", &timeUs));
1065    if (audio) {
1066        mAudioLastDequeueTimeUs = timeUs;
1067    } else {
1068        mVideoLastDequeueTimeUs = timeUs;
1069    }
1070
1071    if (mSubtitleTrack.mSource != NULL
1072            && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1073        sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
1074        msg->setInt64("timeUs", timeUs);
1075        msg->setInt32("generation", mFetchSubtitleDataGeneration);
1076        msg->post();
1077    }
1078
1079    if (mTimedTextTrack.mSource != NULL
1080            && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1081        sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
1082        msg->setInt64("timeUs", timeUs);
1083        msg->setInt32("generation", mFetchTimedTextDataGeneration);
1084        msg->post();
1085    }
1086
1087    return result;
1088}
1089
1090status_t NuPlayer::GenericSource::getDuration(int64_t *durationUs) {
1091    *durationUs = mDurationUs;
1092    return OK;
1093}
1094
1095size_t NuPlayer::GenericSource::getTrackCount() const {
1096    return mSources.size();
1097}
1098
1099sp<AMessage> NuPlayer::GenericSource::getTrackInfo(size_t trackIndex) const {
1100    size_t trackCount = mSources.size();
1101    if (trackIndex >= trackCount) {
1102        return NULL;
1103    }
1104
1105    sp<AMessage> format = new AMessage();
1106    sp<MetaData> meta = mSources.itemAt(trackIndex)->getFormat();
1107
1108    const char *mime;
1109    CHECK(meta->findCString(kKeyMIMEType, &mime));
1110    format->setString("mime", mime);
1111
1112    int32_t trackType;
1113    if (!strncasecmp(mime, "video/", 6)) {
1114        trackType = MEDIA_TRACK_TYPE_VIDEO;
1115    } else if (!strncasecmp(mime, "audio/", 6)) {
1116        trackType = MEDIA_TRACK_TYPE_AUDIO;
1117    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP)) {
1118        trackType = MEDIA_TRACK_TYPE_TIMEDTEXT;
1119    } else {
1120        trackType = MEDIA_TRACK_TYPE_UNKNOWN;
1121    }
1122    format->setInt32("type", trackType);
1123
1124    const char *lang;
1125    if (!meta->findCString(kKeyMediaLanguage, &lang)) {
1126        lang = "und";
1127    }
1128    format->setString("language", lang);
1129
1130    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1131        int32_t isAutoselect = 1, isDefault = 0, isForced = 0;
1132        meta->findInt32(kKeyTrackIsAutoselect, &isAutoselect);
1133        meta->findInt32(kKeyTrackIsDefault, &isDefault);
1134        meta->findInt32(kKeyTrackIsForced, &isForced);
1135
1136        format->setInt32("auto", !!isAutoselect);
1137        format->setInt32("default", !!isDefault);
1138        format->setInt32("forced", !!isForced);
1139    }
1140
1141    return format;
1142}
1143
1144ssize_t NuPlayer::GenericSource::getSelectedTrack(media_track_type type) const {
1145    sp<AMessage> msg = new AMessage(kWhatGetSelectedTrack, this);
1146    msg->setInt32("type", type);
1147
1148    sp<AMessage> response;
1149    int32_t index;
1150    status_t err = msg->postAndAwaitResponse(&response);
1151    if (err == OK && response != NULL) {
1152        CHECK(response->findInt32("index", &index));
1153        return index;
1154    } else {
1155        return -1;
1156    }
1157}
1158
1159void NuPlayer::GenericSource::onGetSelectedTrack(sp<AMessage> msg) const {
1160    int32_t tmpType;
1161    CHECK(msg->findInt32("type", &tmpType));
1162    media_track_type type = (media_track_type)tmpType;
1163
1164    sp<AMessage> response = new AMessage;
1165    ssize_t index = doGetSelectedTrack(type);
1166    response->setInt32("index", index);
1167
1168    sp<AReplyToken> replyID;
1169    CHECK(msg->senderAwaitsResponse(&replyID));
1170    response->postReply(replyID);
1171}
1172
1173ssize_t NuPlayer::GenericSource::doGetSelectedTrack(media_track_type type) const {
1174    const Track *track = NULL;
1175    switch (type) {
1176    case MEDIA_TRACK_TYPE_VIDEO:
1177        track = &mVideoTrack;
1178        break;
1179    case MEDIA_TRACK_TYPE_AUDIO:
1180        track = &mAudioTrack;
1181        break;
1182    case MEDIA_TRACK_TYPE_TIMEDTEXT:
1183        track = &mTimedTextTrack;
1184        break;
1185    case MEDIA_TRACK_TYPE_SUBTITLE:
1186        track = &mSubtitleTrack;
1187        break;
1188    default:
1189        break;
1190    }
1191
1192    if (track != NULL && track->mSource != NULL) {
1193        return track->mIndex;
1194    }
1195
1196    return -1;
1197}
1198
1199status_t NuPlayer::GenericSource::selectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1200    ALOGV("%s track: %zu", select ? "select" : "deselect", trackIndex);
1201    sp<AMessage> msg = new AMessage(kWhatSelectTrack, this);
1202    msg->setInt32("trackIndex", trackIndex);
1203    msg->setInt32("select", select);
1204    msg->setInt64("timeUs", timeUs);
1205
1206    sp<AMessage> response;
1207    status_t err = msg->postAndAwaitResponse(&response);
1208    if (err == OK && response != NULL) {
1209        CHECK(response->findInt32("err", &err));
1210    }
1211
1212    return err;
1213}
1214
1215void NuPlayer::GenericSource::onSelectTrack(sp<AMessage> msg) {
1216    int32_t trackIndex, select;
1217    int64_t timeUs;
1218    CHECK(msg->findInt32("trackIndex", &trackIndex));
1219    CHECK(msg->findInt32("select", &select));
1220    CHECK(msg->findInt64("timeUs", &timeUs));
1221
1222    sp<AMessage> response = new AMessage;
1223    status_t err = doSelectTrack(trackIndex, select, timeUs);
1224    response->setInt32("err", err);
1225
1226    sp<AReplyToken> replyID;
1227    CHECK(msg->senderAwaitsResponse(&replyID));
1228    response->postReply(replyID);
1229}
1230
1231status_t NuPlayer::GenericSource::doSelectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1232    if (trackIndex >= mSources.size()) {
1233        return BAD_INDEX;
1234    }
1235
1236    if (!select) {
1237        Track* track = NULL;
1238        if (mSubtitleTrack.mSource != NULL && trackIndex == mSubtitleTrack.mIndex) {
1239            track = &mSubtitleTrack;
1240            mFetchSubtitleDataGeneration++;
1241        } else if (mTimedTextTrack.mSource != NULL && trackIndex == mTimedTextTrack.mIndex) {
1242            track = &mTimedTextTrack;
1243            mFetchTimedTextDataGeneration++;
1244        }
1245        if (track == NULL) {
1246            return INVALID_OPERATION;
1247        }
1248        track->mSource->stop();
1249        track->mSource = NULL;
1250        track->mPackets->clear();
1251        return OK;
1252    }
1253
1254    const sp<MediaSource> source = mSources.itemAt(trackIndex);
1255    sp<MetaData> meta = source->getFormat();
1256    const char *mime;
1257    CHECK(meta->findCString(kKeyMIMEType, &mime));
1258    if (!strncasecmp(mime, "text/", 5)) {
1259        bool isSubtitle = strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP);
1260        Track *track = isSubtitle ? &mSubtitleTrack : &mTimedTextTrack;
1261        if (track->mSource != NULL && track->mIndex == trackIndex) {
1262            return OK;
1263        }
1264        track->mIndex = trackIndex;
1265        if (track->mSource != NULL) {
1266            track->mSource->stop();
1267        }
1268        track->mSource = mSources.itemAt(trackIndex);
1269        track->mSource->start();
1270        if (track->mPackets == NULL) {
1271            track->mPackets = new AnotherPacketSource(track->mSource->getFormat());
1272        } else {
1273            track->mPackets->clear();
1274            track->mPackets->setFormat(track->mSource->getFormat());
1275
1276        }
1277
1278        if (isSubtitle) {
1279            mFetchSubtitleDataGeneration++;
1280        } else {
1281            mFetchTimedTextDataGeneration++;
1282        }
1283
1284        status_t eosResult; // ignored
1285        if (mSubtitleTrack.mSource != NULL
1286                && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1287            sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
1288            msg->setInt64("timeUs", timeUs);
1289            msg->setInt32("generation", mFetchSubtitleDataGeneration);
1290            msg->post();
1291        }
1292
1293        sp<AMessage> msg2 = new AMessage(kWhatSendGlobalTimedTextData, this);
1294        msg2->setInt32("generation", mFetchTimedTextDataGeneration);
1295        msg2->post();
1296
1297        if (mTimedTextTrack.mSource != NULL
1298                && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1299            sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
1300            msg->setInt64("timeUs", timeUs);
1301            msg->setInt32("generation", mFetchTimedTextDataGeneration);
1302            msg->post();
1303        }
1304
1305        return OK;
1306    } else if (!strncasecmp(mime, "audio/", 6) || !strncasecmp(mime, "video/", 6)) {
1307        bool audio = !strncasecmp(mime, "audio/", 6);
1308        Track *track = audio ? &mAudioTrack : &mVideoTrack;
1309        if (track->mSource != NULL && track->mIndex == trackIndex) {
1310            return OK;
1311        }
1312
1313        sp<AMessage> msg = new AMessage(kWhatChangeAVSource, this);
1314        msg->setInt32("trackIndex", trackIndex);
1315        msg->post();
1316        return OK;
1317    }
1318
1319    return INVALID_OPERATION;
1320}
1321
1322status_t NuPlayer::GenericSource::seekTo(int64_t seekTimeUs) {
1323    sp<AMessage> msg = new AMessage(kWhatSeek, this);
1324    msg->setInt64("seekTimeUs", seekTimeUs);
1325
1326    sp<AMessage> response;
1327    status_t err = msg->postAndAwaitResponse(&response);
1328    if (err == OK && response != NULL) {
1329        CHECK(response->findInt32("err", &err));
1330    }
1331
1332    return err;
1333}
1334
1335void NuPlayer::GenericSource::onSeek(sp<AMessage> msg) {
1336    int64_t seekTimeUs;
1337    CHECK(msg->findInt64("seekTimeUs", &seekTimeUs));
1338
1339    sp<AMessage> response = new AMessage;
1340    status_t err = doSeek(seekTimeUs);
1341    response->setInt32("err", err);
1342
1343    sp<AReplyToken> replyID;
1344    CHECK(msg->senderAwaitsResponse(&replyID));
1345    response->postReply(replyID);
1346}
1347
1348status_t NuPlayer::GenericSource::doSeek(int64_t seekTimeUs) {
1349    // If the Widevine source is stopped, do not attempt to read any
1350    // more buffers.
1351    if (mStopRead) {
1352        return INVALID_OPERATION;
1353    }
1354    if (mVideoTrack.mSource != NULL) {
1355        int64_t actualTimeUs;
1356        readBuffer(MEDIA_TRACK_TYPE_VIDEO, seekTimeUs, &actualTimeUs);
1357
1358        seekTimeUs = actualTimeUs;
1359        mVideoLastDequeueTimeUs = seekTimeUs;
1360    }
1361
1362    if (mAudioTrack.mSource != NULL) {
1363        readBuffer(MEDIA_TRACK_TYPE_AUDIO, seekTimeUs);
1364        mAudioLastDequeueTimeUs = seekTimeUs;
1365    }
1366
1367    setDrmPlaybackStatusIfNeeded(Playback::START, seekTimeUs / 1000);
1368    if (!mStarted) {
1369        setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
1370    }
1371
1372    // If currently buffering, post kWhatBufferingEnd first, so that
1373    // NuPlayer resumes. Otherwise, if cache hits high watermark
1374    // before new polling happens, no one will resume the playback.
1375    stopBufferingIfNecessary();
1376    restartPollBuffering();
1377
1378    return OK;
1379}
1380
1381sp<ABuffer> NuPlayer::GenericSource::mediaBufferToABuffer(
1382        MediaBuffer* mb,
1383        media_track_type trackType,
1384        int64_t /* seekTimeUs */,
1385        int64_t *actualTimeUs) {
1386    bool audio = trackType == MEDIA_TRACK_TYPE_AUDIO;
1387    size_t outLength = mb->range_length();
1388
1389    if (audio && mAudioIsVorbis) {
1390        outLength += sizeof(int32_t);
1391    }
1392
1393    sp<ABuffer> ab;
1394    if (mIsSecure && !audio) {
1395        // data is already provided in the buffer
1396        ab = new ABuffer(NULL, mb->range_length());
1397        mb->add_ref();
1398        ab->setMediaBufferBase(mb);
1399    } else {
1400        ab = new ABuffer(outLength);
1401        memcpy(ab->data(),
1402               (const uint8_t *)mb->data() + mb->range_offset(),
1403               mb->range_length());
1404    }
1405
1406    if (audio && mAudioIsVorbis) {
1407        int32_t numPageSamples;
1408        if (!mb->meta_data()->findInt32(kKeyValidSamples, &numPageSamples)) {
1409            numPageSamples = -1;
1410        }
1411
1412        uint8_t* abEnd = ab->data() + mb->range_length();
1413        memcpy(abEnd, &numPageSamples, sizeof(numPageSamples));
1414    }
1415
1416    sp<AMessage> meta = ab->meta();
1417
1418    int64_t timeUs;
1419    CHECK(mb->meta_data()->findInt64(kKeyTime, &timeUs));
1420    meta->setInt64("timeUs", timeUs);
1421
1422#if 0
1423    // Temporarily disable pre-roll till we have a full solution to handle
1424    // both single seek and continous seek gracefully.
1425    if (seekTimeUs > timeUs) {
1426        sp<AMessage> extra = new AMessage;
1427        extra->setInt64("resume-at-mediaTimeUs", seekTimeUs);
1428        meta->setMessage("extra", extra);
1429    }
1430#endif
1431
1432    if (trackType == MEDIA_TRACK_TYPE_TIMEDTEXT) {
1433        const char *mime;
1434        CHECK(mTimedTextTrack.mSource != NULL
1435                && mTimedTextTrack.mSource->getFormat()->findCString(kKeyMIMEType, &mime));
1436        meta->setString("mime", mime);
1437    }
1438
1439    int64_t durationUs;
1440    if (mb->meta_data()->findInt64(kKeyDuration, &durationUs)) {
1441        meta->setInt64("durationUs", durationUs);
1442    }
1443
1444    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1445        meta->setInt32("trackIndex", mSubtitleTrack.mIndex);
1446    }
1447
1448    uint32_t dataType; // unused
1449    const void *seiData;
1450    size_t seiLength;
1451    if (mb->meta_data()->findData(kKeySEI, &dataType, &seiData, &seiLength)) {
1452        sp<ABuffer> sei = ABuffer::CreateAsCopy(seiData, seiLength);;
1453        meta->setBuffer("sei", sei);
1454    }
1455
1456    if (actualTimeUs) {
1457        *actualTimeUs = timeUs;
1458    }
1459
1460    mb->release();
1461    mb = NULL;
1462
1463    return ab;
1464}
1465
1466void NuPlayer::GenericSource::postReadBuffer(media_track_type trackType) {
1467    Mutex::Autolock _l(mReadBufferLock);
1468
1469    if ((mPendingReadBufferTypes & (1 << trackType)) == 0) {
1470        mPendingReadBufferTypes |= (1 << trackType);
1471        sp<AMessage> msg = new AMessage(kWhatReadBuffer, this);
1472        msg->setInt32("trackType", trackType);
1473        msg->post();
1474    }
1475}
1476
1477void NuPlayer::GenericSource::onReadBuffer(sp<AMessage> msg) {
1478    int32_t tmpType;
1479    CHECK(msg->findInt32("trackType", &tmpType));
1480    media_track_type trackType = (media_track_type)tmpType;
1481    readBuffer(trackType);
1482    {
1483        // only protect the variable change, as readBuffer may
1484        // take considerable time.
1485        Mutex::Autolock _l(mReadBufferLock);
1486        mPendingReadBufferTypes &= ~(1 << trackType);
1487    }
1488}
1489
1490void NuPlayer::GenericSource::readBuffer(
1491        media_track_type trackType, int64_t seekTimeUs, int64_t *actualTimeUs, bool formatChange) {
1492    // Do not read data if Widevine source is stopped
1493    if (mStopRead) {
1494        return;
1495    }
1496    Track *track;
1497    size_t maxBuffers = 1;
1498    switch (trackType) {
1499        case MEDIA_TRACK_TYPE_VIDEO:
1500            track = &mVideoTrack;
1501            if (mIsWidevine) {
1502                maxBuffers = 2;
1503            } else {
1504                maxBuffers = 4;
1505            }
1506            break;
1507        case MEDIA_TRACK_TYPE_AUDIO:
1508            track = &mAudioTrack;
1509            if (mIsWidevine) {
1510                maxBuffers = 8;
1511            } else {
1512                maxBuffers = 64;
1513            }
1514            break;
1515        case MEDIA_TRACK_TYPE_SUBTITLE:
1516            track = &mSubtitleTrack;
1517            break;
1518        case MEDIA_TRACK_TYPE_TIMEDTEXT:
1519            track = &mTimedTextTrack;
1520            break;
1521        default:
1522            TRESPASS();
1523    }
1524
1525    if (track->mSource == NULL) {
1526        return;
1527    }
1528
1529    if (actualTimeUs) {
1530        *actualTimeUs = seekTimeUs;
1531    }
1532
1533    MediaSource::ReadOptions options;
1534
1535    bool seeking = false;
1536
1537    if (seekTimeUs >= 0) {
1538        options.setSeekTo(seekTimeUs, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
1539        seeking = true;
1540    }
1541
1542    if (mIsWidevine) {
1543        options.setNonBlocking();
1544    }
1545
1546    for (size_t numBuffers = 0; numBuffers < maxBuffers; ) {
1547        MediaBuffer *mbuf;
1548        status_t err = track->mSource->read(&mbuf, &options);
1549
1550        options.clearSeekTo();
1551
1552        if (err == OK) {
1553            int64_t timeUs;
1554            CHECK(mbuf->meta_data()->findInt64(kKeyTime, &timeUs));
1555            if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
1556                mAudioTimeUs = timeUs;
1557            } else if (trackType == MEDIA_TRACK_TYPE_VIDEO) {
1558                mVideoTimeUs = timeUs;
1559            }
1560
1561            queueDiscontinuityIfNeeded(seeking, formatChange, trackType, track);
1562
1563            sp<ABuffer> buffer = mediaBufferToABuffer(
1564                    mbuf, trackType, seekTimeUs,
1565                    numBuffers == 0 ? actualTimeUs : NULL);
1566            track->mPackets->queueAccessUnit(buffer);
1567            formatChange = false;
1568            seeking = false;
1569            ++numBuffers;
1570        } else if (err == WOULD_BLOCK) {
1571            break;
1572        } else if (err == INFO_FORMAT_CHANGED) {
1573#if 0
1574            track->mPackets->queueDiscontinuity(
1575                    ATSParser::DISCONTINUITY_FORMATCHANGE,
1576                    NULL,
1577                    false /* discard */);
1578#endif
1579        } else {
1580            queueDiscontinuityIfNeeded(seeking, formatChange, trackType, track);
1581            track->mPackets->signalEOS(err);
1582            break;
1583        }
1584    }
1585}
1586
1587void NuPlayer::GenericSource::queueDiscontinuityIfNeeded(
1588        bool seeking, bool formatChange, media_track_type trackType, Track *track) {
1589    // formatChange && seeking: track whose source is changed during selection
1590    // formatChange && !seeking: track whose source is not changed during selection
1591    // !formatChange: normal seek
1592    if ((seeking || formatChange)
1593            && (trackType == MEDIA_TRACK_TYPE_AUDIO
1594            || trackType == MEDIA_TRACK_TYPE_VIDEO)) {
1595        ATSParser::DiscontinuityType type = (formatChange && seeking)
1596                ? ATSParser::DISCONTINUITY_FORMATCHANGE
1597                : ATSParser::DISCONTINUITY_NONE;
1598        track->mPackets->queueDiscontinuity(type, NULL /* extra */, true /* discard */);
1599    }
1600}
1601
1602}  // namespace android
1603