GenericSource.cpp revision c287cad65bd0c7a79e43f4decc5e04593027a7c8 
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
127sp<MetaData> NuPlayer::GenericSource::getFileFormatMeta() const {
128    return mFileMeta;
129}
130
131status_t NuPlayer::GenericSource::initFromDataSource() {
132    sp<MediaExtractor> extractor;
133    String8 mimeType;
134    float confidence;
135    sp<AMessage> dummy;
136    bool isWidevineStreaming = false;
137
138    CHECK(mDataSource != NULL);
139
140    if (mIsWidevine) {
141        isWidevineStreaming = SniffWVM(
142                mDataSource, &mimeType, &confidence, &dummy);
143        if (!isWidevineStreaming ||
144                strcasecmp(
145                    mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM)) {
146            ALOGE("unsupported widevine mime: %s", mimeType.string());
147            return UNKNOWN_ERROR;
148        }
149    } else if (mIsStreaming) {
150        if (!mDataSource->sniff(&mimeType, &confidence, &dummy)) {
151            return UNKNOWN_ERROR;
152        }
153        isWidevineStreaming = !strcasecmp(
154                mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM);
155    }
156
157    if (isWidevineStreaming) {
158        // we don't want cached source for widevine streaming.
159        mCachedSource.clear();
160        mDataSource = mHttpSource;
161        mWVMExtractor = new WVMExtractor(mDataSource);
162        mWVMExtractor->setAdaptiveStreamingMode(true);
163        if (mUIDValid) {
164            mWVMExtractor->setUID(mUID);
165        }
166        extractor = mWVMExtractor;
167    } else {
168        extractor = MediaExtractor::Create(mDataSource,
169                mimeType.isEmpty() ? NULL : mimeType.string());
170    }
171
172    if (extractor == NULL) {
173        return UNKNOWN_ERROR;
174    }
175
176    if (extractor->getDrmFlag()) {
177        checkDrmStatus(mDataSource);
178    }
179
180    mFileMeta = extractor->getMetaData();
181    if (mFileMeta != NULL) {
182        int64_t duration;
183        if (mFileMeta->findInt64(kKeyDuration, &duration)) {
184            mDurationUs = duration;
185        }
186
187        if (!mIsWidevine) {
188            // Check mime to see if we actually have a widevine source.
189            // If the data source is not URL-type (eg. file source), we
190            // won't be able to tell until now.
191            const char *fileMime;
192            if (mFileMeta->findCString(kKeyMIMEType, &fileMime)
193                    && !strncasecmp(fileMime, "video/wvm", 9)) {
194                mIsWidevine = true;
195            }
196        }
197    }
198
199    int32_t totalBitrate = 0;
200
201    size_t numtracks = extractor->countTracks();
202    if (numtracks == 0) {
203        return UNKNOWN_ERROR;
204    }
205
206    for (size_t i = 0; i < numtracks; ++i) {
207        sp<MediaSource> track = extractor->getTrack(i);
208
209        sp<MetaData> meta = extractor->getTrackMetaData(i);
210
211        const char *mime;
212        CHECK(meta->findCString(kKeyMIMEType, &mime));
213
214        // Do the string compare immediately with "mime",
215        // we can't assume "mime" would stay valid after another
216        // extractor operation, some extractors might modify meta
217        // during getTrack() and make it invalid.
218        if (!strncasecmp(mime, "audio/", 6)) {
219            if (mAudioTrack.mSource == NULL) {
220                mAudioTrack.mIndex = i;
221                mAudioTrack.mSource = track;
222                mAudioTrack.mPackets =
223                    new AnotherPacketSource(mAudioTrack.mSource->getFormat());
224
225                if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_VORBIS)) {
226                    mAudioIsVorbis = true;
227                } else {
228                    mAudioIsVorbis = false;
229                }
230            }
231        } else if (!strncasecmp(mime, "video/", 6)) {
232            if (mVideoTrack.mSource == NULL) {
233                mVideoTrack.mIndex = i;
234                mVideoTrack.mSource = track;
235                mVideoTrack.mPackets =
236                    new AnotherPacketSource(mVideoTrack.mSource->getFormat());
237
238                // check if the source requires secure buffers
239                int32_t secure;
240                if (meta->findInt32(kKeyRequiresSecureBuffers, &secure)
241                        && secure) {
242                    mIsSecure = true;
243                    if (mUIDValid) {
244                        extractor->setUID(mUID);
245                    }
246                }
247            }
248        }
249
250        if (track != NULL) {
251            mSources.push(track);
252            int64_t durationUs;
253            if (meta->findInt64(kKeyDuration, &durationUs)) {
254                if (durationUs > mDurationUs) {
255                    mDurationUs = durationUs;
256                }
257            }
258
259            int32_t bitrate;
260            if (totalBitrate >= 0 && meta->findInt32(kKeyBitRate, &bitrate)) {
261                totalBitrate += bitrate;
262            } else {
263                totalBitrate = -1;
264            }
265        }
266    }
267
268    // Start the selected A/V tracks now before we start buffering.
269    // Widevine sources might re-initialize crypto when starting, if we delay
270    // this to start(), all data buffered during prepare would be wasted.
271    // (We don't actually start reading until start().)
272    if (mAudioTrack.mSource != NULL && mAudioTrack.mSource->start() != OK) {
273        ALOGE("failed to start audio track!");
274        return UNKNOWN_ERROR;
275    }
276
277    if (mVideoTrack.mSource != NULL && mVideoTrack.mSource->start() != OK) {
278        ALOGE("failed to start video track!");
279        return UNKNOWN_ERROR;
280    }
281
282    mBitrate = totalBitrate;
283
284    return OK;
285}
286
287void NuPlayer::GenericSource::checkDrmStatus(const sp<DataSource>& dataSource) {
288    dataSource->getDrmInfo(mDecryptHandle, &mDrmManagerClient);
289    if (mDecryptHandle != NULL) {
290        CHECK(mDrmManagerClient);
291        if (RightsStatus::RIGHTS_VALID != mDecryptHandle->status) {
292            sp<AMessage> msg = dupNotify();
293            msg->setInt32("what", kWhatDrmNoLicense);
294            msg->post();
295        }
296    }
297}
298
299int64_t NuPlayer::GenericSource::getLastReadPosition() {
300    if (mAudioTrack.mSource != NULL) {
301        return mAudioTimeUs;
302    } else if (mVideoTrack.mSource != NULL) {
303        return mVideoTimeUs;
304    } else {
305        return 0;
306    }
307}
308
309status_t NuPlayer::GenericSource::setBuffers(
310        bool audio, Vector<MediaBuffer *> &buffers) {
311    if (mIsSecure && !audio) {
312        return mVideoTrack.mSource->setBuffers(buffers);
313    }
314    return INVALID_OPERATION;
315}
316
317NuPlayer::GenericSource::~GenericSource() {
318    if (mLooper != NULL) {
319        mLooper->unregisterHandler(id());
320        mLooper->stop();
321    }
322    resetDataSource();
323}
324
325void NuPlayer::GenericSource::prepareAsync() {
326    if (mLooper == NULL) {
327        mLooper = new ALooper;
328        mLooper->setName("generic");
329        mLooper->start();
330
331        mLooper->registerHandler(this);
332    }
333
334    sp<AMessage> msg = new AMessage(kWhatPrepareAsync, this);
335    msg->post();
336}
337
338void NuPlayer::GenericSource::onPrepareAsync() {
339    // delayed data source creation
340    if (mDataSource == NULL) {
341        // set to false first, if the extractor
342        // comes back as secure, set it to true then.
343        mIsSecure = false;
344
345        if (!mUri.empty()) {
346            const char* uri = mUri.c_str();
347            String8 contentType;
348            mIsWidevine = !strncasecmp(uri, "widevine://", 11);
349
350            if (!strncasecmp("http://", uri, 7)
351                    || !strncasecmp("https://", uri, 8)
352                    || mIsWidevine) {
353                mHttpSource = DataSource::CreateMediaHTTP(mHTTPService);
354                if (mHttpSource == NULL) {
355                    ALOGE("Failed to create http source!");
356                    notifyPreparedAndCleanup(UNKNOWN_ERROR);
357                    return;
358                }
359            }
360
361            mDataSource = DataSource::CreateFromURI(
362                   mHTTPService, uri, &mUriHeaders, &contentType,
363                   static_cast<HTTPBase *>(mHttpSource.get()));
364        } else {
365            mIsWidevine = false;
366
367            mDataSource = new FileSource(mFd, mOffset, mLength);
368            mFd = -1;
369        }
370
371        if (mDataSource == NULL) {
372            ALOGE("Failed to create data source!");
373            notifyPreparedAndCleanup(UNKNOWN_ERROR);
374            return;
375        }
376
377        if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
378            mCachedSource = static_cast<NuCachedSource2 *>(mDataSource.get());
379        }
380
381        // For widevine or other cached streaming cases, we need to wait for
382        // enough buffering before reporting prepared.
383        // Note that even when URL doesn't start with widevine://, mIsWidevine
384        // could still be set to true later, if the streaming or file source
385        // is sniffed to be widevine. We don't want to buffer for file source
386        // in that case, so must check the flag now.
387        mIsStreaming = (mIsWidevine || mCachedSource != NULL);
388    }
389
390    // init extractor from data source
391    status_t err = initFromDataSource();
392
393    if (err != OK) {
394        ALOGE("Failed to init from data source!");
395        notifyPreparedAndCleanup(err);
396        return;
397    }
398
399    if (mVideoTrack.mSource != NULL) {
400        sp<MetaData> meta = doGetFormatMeta(false /* audio */);
401        sp<AMessage> msg = new AMessage;
402        err = convertMetaDataToMessage(meta, &msg);
403        if(err != OK) {
404            notifyPreparedAndCleanup(err);
405            return;
406        }
407        notifyVideoSizeChanged(msg);
408    }
409
410    notifyFlagsChanged(
411            (mIsSecure ? FLAG_SECURE : 0)
412            | (mDecryptHandle != NULL ? FLAG_PROTECTED : 0)
413            | FLAG_CAN_PAUSE
414            | FLAG_CAN_SEEK_BACKWARD
415            | FLAG_CAN_SEEK_FORWARD
416            | FLAG_CAN_SEEK);
417
418    if (mIsStreaming) {
419        mPrepareBuffering = true;
420
421        ensureCacheIsFetching();
422        restartPollBuffering();
423    } else {
424        notifyPrepared();
425    }
426}
427
428void NuPlayer::GenericSource::notifyPreparedAndCleanup(status_t err) {
429    if (err != OK) {
430        mDataSource.clear();
431        mCachedSource.clear();
432        mHttpSource.clear();
433
434        cancelPollBuffering();
435    }
436    notifyPrepared(err);
437}
438
439void NuPlayer::GenericSource::start() {
440    ALOGI("start");
441
442    mStopRead = false;
443    if (mAudioTrack.mSource != NULL) {
444        postReadBuffer(MEDIA_TRACK_TYPE_AUDIO);
445    }
446
447    if (mVideoTrack.mSource != NULL) {
448        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
449    }
450
451    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
452    mStarted = true;
453
454    (new AMessage(kWhatStart, this))->post();
455}
456
457void NuPlayer::GenericSource::stop() {
458    // nothing to do, just account for DRM playback status
459    setDrmPlaybackStatusIfNeeded(Playback::STOP, 0);
460    mStarted = false;
461    if (mIsWidevine || mIsSecure) {
462        // For widevine or secure sources we need to prevent any further reads.
463        sp<AMessage> msg = new AMessage(kWhatStopWidevine, this);
464        sp<AMessage> response;
465        (void) msg->postAndAwaitResponse(&response);
466    }
467}
468
469void NuPlayer::GenericSource::pause() {
470    // nothing to do, just account for DRM playback status
471    setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
472    mStarted = false;
473}
474
475void NuPlayer::GenericSource::resume() {
476    // nothing to do, just account for DRM playback status
477    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
478    mStarted = true;
479
480    (new AMessage(kWhatResume, this))->post();
481}
482
483void NuPlayer::GenericSource::disconnect() {
484    if (mDataSource != NULL) {
485        // disconnect data source
486        if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
487            static_cast<NuCachedSource2 *>(mDataSource.get())->disconnect();
488        }
489    } else if (mHttpSource != NULL) {
490        static_cast<HTTPBase *>(mHttpSource.get())->disconnect();
491    }
492}
493
494void NuPlayer::GenericSource::setDrmPlaybackStatusIfNeeded(int playbackStatus, int64_t position) {
495    if (mDecryptHandle != NULL) {
496        mDrmManagerClient->setPlaybackStatus(mDecryptHandle, playbackStatus, position);
497    }
498    mSubtitleTrack.mPackets = new AnotherPacketSource(NULL);
499    mTimedTextTrack.mPackets = new AnotherPacketSource(NULL);
500}
501
502status_t NuPlayer::GenericSource::feedMoreTSData() {
503    return OK;
504}
505
506void NuPlayer::GenericSource::schedulePollBuffering() {
507    sp<AMessage> msg = new AMessage(kWhatPollBuffering, this);
508    msg->setInt32("generation", mPollBufferingGeneration);
509    msg->post(1000000ll);
510}
511
512void NuPlayer::GenericSource::cancelPollBuffering() {
513    mBuffering = false;
514    ++mPollBufferingGeneration;
515    mPrevBufferPercentage = -1;
516}
517
518void NuPlayer::GenericSource::restartPollBuffering() {
519    if (mIsStreaming) {
520        cancelPollBuffering();
521        onPollBuffering();
522    }
523}
524
525void NuPlayer::GenericSource::notifyBufferingUpdate(int32_t percentage) {
526    // Buffering percent could go backward as it's estimated from remaining
527    // data and last access time. This could cause the buffering position
528    // drawn on media control to jitter slightly. Remember previously reported
529    // percentage and don't allow it to go backward.
530    if (percentage < mPrevBufferPercentage) {
531        percentage = mPrevBufferPercentage;
532    } else if (percentage > 100) {
533        percentage = 100;
534    }
535
536    mPrevBufferPercentage = percentage;
537
538    ALOGV("notifyBufferingUpdate: buffering %d%%", percentage);
539
540    sp<AMessage> msg = dupNotify();
541    msg->setInt32("what", kWhatBufferingUpdate);
542    msg->setInt32("percentage", percentage);
543    msg->post();
544}
545
546void NuPlayer::GenericSource::startBufferingIfNecessary() {
547    ALOGV("startBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
548            mPrepareBuffering, mBuffering);
549
550    if (mPrepareBuffering) {
551        return;
552    }
553
554    if (!mBuffering) {
555        mBuffering = true;
556
557        ensureCacheIsFetching();
558        sendCacheStats();
559
560        sp<AMessage> notify = dupNotify();
561        notify->setInt32("what", kWhatPauseOnBufferingStart);
562        notify->post();
563    }
564}
565
566void NuPlayer::GenericSource::stopBufferingIfNecessary() {
567    ALOGV("stopBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
568            mPrepareBuffering, mBuffering);
569
570    if (mPrepareBuffering) {
571        mPrepareBuffering = false;
572        notifyPrepared();
573        return;
574    }
575
576    if (mBuffering) {
577        mBuffering = false;
578
579        sendCacheStats();
580
581        sp<AMessage> notify = dupNotify();
582        notify->setInt32("what", kWhatResumeOnBufferingEnd);
583        notify->post();
584    }
585}
586
587void NuPlayer::GenericSource::sendCacheStats() {
588    int32_t kbps = 0;
589    status_t err = UNKNOWN_ERROR;
590
591    if (mWVMExtractor != NULL) {
592        err = mWVMExtractor->getEstimatedBandwidthKbps(&kbps);
593    } else if (mCachedSource != NULL) {
594        err = mCachedSource->getEstimatedBandwidthKbps(&kbps);
595    }
596
597    if (err == OK) {
598        sp<AMessage> notify = dupNotify();
599        notify->setInt32("what", kWhatCacheStats);
600        notify->setInt32("bandwidth", kbps);
601        notify->post();
602    }
603}
604
605void NuPlayer::GenericSource::ensureCacheIsFetching() {
606    if (mCachedSource != NULL) {
607        mCachedSource->resumeFetchingIfNecessary();
608    }
609}
610
611void NuPlayer::GenericSource::onPollBuffering() {
612    status_t finalStatus = UNKNOWN_ERROR;
613    int64_t cachedDurationUs = -1ll;
614    ssize_t cachedDataRemaining = -1;
615
616    ALOGW_IF(mWVMExtractor != NULL && mCachedSource != NULL,
617            "WVMExtractor and NuCachedSource both present");
618
619    if (mWVMExtractor != NULL) {
620        cachedDurationUs =
621                mWVMExtractor->getCachedDurationUs(&finalStatus);
622    } else if (mCachedSource != NULL) {
623        cachedDataRemaining =
624                mCachedSource->approxDataRemaining(&finalStatus);
625
626        if (finalStatus == OK) {
627            off64_t size;
628            int64_t bitrate = 0ll;
629            if (mDurationUs > 0 && mCachedSource->getSize(&size) == OK) {
630                bitrate = size * 8000000ll / mDurationUs;
631            } else if (mBitrate > 0) {
632                bitrate = mBitrate;
633            }
634            if (bitrate > 0) {
635                cachedDurationUs = cachedDataRemaining * 8000000ll / bitrate;
636            }
637        }
638    }
639
640    if (finalStatus != OK) {
641        ALOGV("onPollBuffering: EOS (finalStatus = %d)", finalStatus);
642
643        if (finalStatus == ERROR_END_OF_STREAM) {
644            notifyBufferingUpdate(100);
645        }
646
647        stopBufferingIfNecessary();
648        return;
649    } else if (cachedDurationUs >= 0ll) {
650        if (mDurationUs > 0ll) {
651            int64_t cachedPosUs = getLastReadPosition() + cachedDurationUs;
652            int percentage = 100.0 * cachedPosUs / mDurationUs;
653            if (percentage > 100) {
654                percentage = 100;
655            }
656
657            notifyBufferingUpdate(percentage);
658        }
659
660        ALOGV("onPollBuffering: cachedDurationUs %.1f sec",
661                cachedDurationUs / 1000000.0f);
662
663        if (cachedDurationUs < kLowWaterMarkUs) {
664            startBufferingIfNecessary();
665        } else if (cachedDurationUs > kHighWaterMarkUs) {
666            stopBufferingIfNecessary();
667        }
668    } else if (cachedDataRemaining >= 0) {
669        ALOGV("onPollBuffering: cachedDataRemaining %d bytes",
670                cachedDataRemaining);
671
672        if (cachedDataRemaining < kLowWaterMarkBytes) {
673            startBufferingIfNecessary();
674        } else if (cachedDataRemaining > kHighWaterMarkBytes) {
675            stopBufferingIfNecessary();
676        }
677    }
678
679    schedulePollBuffering();
680}
681
682void NuPlayer::GenericSource::onMessageReceived(const sp<AMessage> &msg) {
683    switch (msg->what()) {
684      case kWhatPrepareAsync:
685      {
686          onPrepareAsync();
687          break;
688      }
689      case kWhatFetchSubtitleData:
690      {
691          fetchTextData(kWhatSendSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
692                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
693          break;
694      }
695
696      case kWhatFetchTimedTextData:
697      {
698          fetchTextData(kWhatSendTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
699                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
700          break;
701      }
702
703      case kWhatSendSubtitleData:
704      {
705          sendTextData(kWhatSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
706                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
707          break;
708      }
709
710      case kWhatSendTimedTextData:
711      {
712          sendTextData(kWhatTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
713                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
714          break;
715      }
716
717      case kWhatChangeAVSource:
718      {
719          int32_t trackIndex;
720          CHECK(msg->findInt32("trackIndex", &trackIndex));
721          const sp<MediaSource> source = mSources.itemAt(trackIndex);
722
723          Track* track;
724          const char *mime;
725          media_track_type trackType, counterpartType;
726          sp<MetaData> meta = source->getFormat();
727          meta->findCString(kKeyMIMEType, &mime);
728          if (!strncasecmp(mime, "audio/", 6)) {
729              track = &mAudioTrack;
730              trackType = MEDIA_TRACK_TYPE_AUDIO;
731              counterpartType = MEDIA_TRACK_TYPE_VIDEO;;
732          } else {
733              CHECK(!strncasecmp(mime, "video/", 6));
734              track = &mVideoTrack;
735              trackType = MEDIA_TRACK_TYPE_VIDEO;
736              counterpartType = MEDIA_TRACK_TYPE_AUDIO;;
737          }
738
739
740          if (track->mSource != NULL) {
741              track->mSource->stop();
742          }
743          track->mSource = source;
744          track->mSource->start();
745          track->mIndex = trackIndex;
746
747          int64_t timeUs, actualTimeUs;
748          const bool formatChange = true;
749          if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
750              timeUs = mAudioLastDequeueTimeUs;
751          } else {
752              timeUs = mVideoLastDequeueTimeUs;
753          }
754          readBuffer(trackType, timeUs, &actualTimeUs, formatChange);
755          readBuffer(counterpartType, -1, NULL, formatChange);
756          ALOGV("timeUs %lld actualTimeUs %lld", timeUs, actualTimeUs);
757
758          break;
759      }
760
761      case kWhatStart:
762      case kWhatResume:
763      {
764          restartPollBuffering();
765          break;
766      }
767
768      case kWhatPollBuffering:
769      {
770          int32_t generation;
771          CHECK(msg->findInt32("generation", &generation));
772          if (generation == mPollBufferingGeneration) {
773              onPollBuffering();
774          }
775          break;
776      }
777
778      case kWhatGetFormat:
779      {
780          onGetFormatMeta(msg);
781          break;
782      }
783
784      case kWhatGetSelectedTrack:
785      {
786          onGetSelectedTrack(msg);
787          break;
788      }
789
790      case kWhatSelectTrack:
791      {
792          onSelectTrack(msg);
793          break;
794      }
795
796      case kWhatSeek:
797      {
798          onSeek(msg);
799          break;
800      }
801
802      case kWhatReadBuffer:
803      {
804          onReadBuffer(msg);
805          break;
806      }
807
808      case kWhatStopWidevine:
809      {
810          // mStopRead is only used for Widevine to prevent the video source
811          // from being read while the associated video decoder is shutting down.
812          mStopRead = true;
813          if (mVideoTrack.mSource != NULL) {
814              mVideoTrack.mPackets->clear();
815          }
816          sp<AMessage> response = new AMessage;
817          sp<AReplyToken> replyID;
818          CHECK(msg->senderAwaitsResponse(&replyID));
819          response->postReply(replyID);
820          break;
821      }
822      default:
823          Source::onMessageReceived(msg);
824          break;
825    }
826}
827
828void NuPlayer::GenericSource::fetchTextData(
829        uint32_t sendWhat,
830        media_track_type type,
831        int32_t curGen,
832        sp<AnotherPacketSource> packets,
833        sp<AMessage> msg) {
834    int32_t msgGeneration;
835    CHECK(msg->findInt32("generation", &msgGeneration));
836    if (msgGeneration != curGen) {
837        // stale
838        return;
839    }
840
841    int32_t avail;
842    if (packets->hasBufferAvailable(&avail)) {
843        return;
844    }
845
846    int64_t timeUs;
847    CHECK(msg->findInt64("timeUs", &timeUs));
848
849    int64_t subTimeUs;
850    readBuffer(type, timeUs, &subTimeUs);
851
852    int64_t delayUs = subTimeUs - timeUs;
853    if (msg->what() == kWhatFetchSubtitleData) {
854        const int64_t oneSecUs = 1000000ll;
855        delayUs -= oneSecUs;
856    }
857    sp<AMessage> msg2 = new AMessage(sendWhat, this);
858    msg2->setInt32("generation", msgGeneration);
859    msg2->post(delayUs < 0 ? 0 : delayUs);
860}
861
862void NuPlayer::GenericSource::sendTextData(
863        uint32_t what,
864        media_track_type type,
865        int32_t curGen,
866        sp<AnotherPacketSource> packets,
867        sp<AMessage> msg) {
868    int32_t msgGeneration;
869    CHECK(msg->findInt32("generation", &msgGeneration));
870    if (msgGeneration != curGen) {
871        // stale
872        return;
873    }
874
875    int64_t subTimeUs;
876    if (packets->nextBufferTime(&subTimeUs) != OK) {
877        return;
878    }
879
880    int64_t nextSubTimeUs;
881    readBuffer(type, -1, &nextSubTimeUs);
882
883    sp<ABuffer> buffer;
884    status_t dequeueStatus = packets->dequeueAccessUnit(&buffer);
885    if (dequeueStatus == OK) {
886        sp<AMessage> notify = dupNotify();
887        notify->setInt32("what", what);
888        notify->setBuffer("buffer", buffer);
889        notify->post();
890
891        const int64_t delayUs = nextSubTimeUs - subTimeUs;
892        msg->post(delayUs < 0 ? 0 : delayUs);
893    }
894}
895
896sp<MetaData> NuPlayer::GenericSource::getFormatMeta(bool audio) {
897    sp<AMessage> msg = new AMessage(kWhatGetFormat, this);
898    msg->setInt32("audio", audio);
899
900    sp<AMessage> response;
901    void *format;
902    status_t err = msg->postAndAwaitResponse(&response);
903    if (err == OK && response != NULL) {
904        CHECK(response->findPointer("format", &format));
905        return (MetaData *)format;
906    } else {
907        return NULL;
908    }
909}
910
911void NuPlayer::GenericSource::onGetFormatMeta(sp<AMessage> msg) const {
912    int32_t audio;
913    CHECK(msg->findInt32("audio", &audio));
914
915    sp<AMessage> response = new AMessage;
916    sp<MetaData> format = doGetFormatMeta(audio);
917    response->setPointer("format", format.get());
918
919    sp<AReplyToken> replyID;
920    CHECK(msg->senderAwaitsResponse(&replyID));
921    response->postReply(replyID);
922}
923
924sp<MetaData> NuPlayer::GenericSource::doGetFormatMeta(bool audio) const {
925    sp<MediaSource> source = audio ? mAudioTrack.mSource : mVideoTrack.mSource;
926
927    if (source == NULL) {
928        return NULL;
929    }
930
931    return source->getFormat();
932}
933
934status_t NuPlayer::GenericSource::dequeueAccessUnit(
935        bool audio, sp<ABuffer> *accessUnit) {
936    Track *track = audio ? &mAudioTrack : &mVideoTrack;
937
938    if (track->mSource == NULL) {
939        return -EWOULDBLOCK;
940    }
941
942    if (mIsWidevine && !audio) {
943        // try to read a buffer as we may not have been able to the last time
944        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
945    }
946
947    status_t finalResult;
948    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
949        if (finalResult == OK) {
950            postReadBuffer(
951                    audio ? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
952            return -EWOULDBLOCK;
953        }
954        return finalResult;
955    }
956
957    status_t result = track->mPackets->dequeueAccessUnit(accessUnit);
958
959    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
960        postReadBuffer(audio? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
961    }
962
963    if (result != OK) {
964        if (mSubtitleTrack.mSource != NULL) {
965            mSubtitleTrack.mPackets->clear();
966            mFetchSubtitleDataGeneration++;
967        }
968        if (mTimedTextTrack.mSource != NULL) {
969            mTimedTextTrack.mPackets->clear();
970            mFetchTimedTextDataGeneration++;
971        }
972        return result;
973    }
974
975    int64_t timeUs;
976    status_t eosResult; // ignored
977    CHECK((*accessUnit)->meta()->findInt64("timeUs", &timeUs));
978    if (audio) {
979        mAudioLastDequeueTimeUs = timeUs;
980    } else {
981        mVideoLastDequeueTimeUs = timeUs;
982    }
983
984    if (mSubtitleTrack.mSource != NULL
985            && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
986        sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
987        msg->setInt64("timeUs", timeUs);
988        msg->setInt32("generation", mFetchSubtitleDataGeneration);
989        msg->post();
990    }
991
992    if (mTimedTextTrack.mSource != NULL
993            && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
994        sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
995        msg->setInt64("timeUs", timeUs);
996        msg->setInt32("generation", mFetchTimedTextDataGeneration);
997        msg->post();
998    }
999
1000    return result;
1001}
1002
1003status_t NuPlayer::GenericSource::getDuration(int64_t *durationUs) {
1004    *durationUs = mDurationUs;
1005    return OK;
1006}
1007
1008size_t NuPlayer::GenericSource::getTrackCount() const {
1009    return mSources.size();
1010}
1011
1012sp<AMessage> NuPlayer::GenericSource::getTrackInfo(size_t trackIndex) const {
1013    size_t trackCount = mSources.size();
1014    if (trackIndex >= trackCount) {
1015        return NULL;
1016    }
1017
1018    sp<AMessage> format = new AMessage();
1019    sp<MetaData> meta = mSources.itemAt(trackIndex)->getFormat();
1020
1021    const char *mime;
1022    CHECK(meta->findCString(kKeyMIMEType, &mime));
1023
1024    int32_t trackType;
1025    if (!strncasecmp(mime, "video/", 6)) {
1026        trackType = MEDIA_TRACK_TYPE_VIDEO;
1027    } else if (!strncasecmp(mime, "audio/", 6)) {
1028        trackType = MEDIA_TRACK_TYPE_AUDIO;
1029    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP)) {
1030        trackType = MEDIA_TRACK_TYPE_TIMEDTEXT;
1031    } else {
1032        trackType = MEDIA_TRACK_TYPE_UNKNOWN;
1033    }
1034    format->setInt32("type", trackType);
1035
1036    const char *lang;
1037    if (!meta->findCString(kKeyMediaLanguage, &lang)) {
1038        lang = "und";
1039    }
1040    format->setString("language", lang);
1041
1042    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1043        format->setString("mime", mime);
1044
1045        int32_t isAutoselect = 1, isDefault = 0, isForced = 0;
1046        meta->findInt32(kKeyTrackIsAutoselect, &isAutoselect);
1047        meta->findInt32(kKeyTrackIsDefault, &isDefault);
1048        meta->findInt32(kKeyTrackIsForced, &isForced);
1049
1050        format->setInt32("auto", !!isAutoselect);
1051        format->setInt32("default", !!isDefault);
1052        format->setInt32("forced", !!isForced);
1053    }
1054
1055    return format;
1056}
1057
1058ssize_t NuPlayer::GenericSource::getSelectedTrack(media_track_type type) const {
1059    sp<AMessage> msg = new AMessage(kWhatGetSelectedTrack, this);
1060    msg->setInt32("type", type);
1061
1062    sp<AMessage> response;
1063    int32_t index;
1064    status_t err = msg->postAndAwaitResponse(&response);
1065    if (err == OK && response != NULL) {
1066        CHECK(response->findInt32("index", &index));
1067        return index;
1068    } else {
1069        return -1;
1070    }
1071}
1072
1073void NuPlayer::GenericSource::onGetSelectedTrack(sp<AMessage> msg) const {
1074    int32_t tmpType;
1075    CHECK(msg->findInt32("type", &tmpType));
1076    media_track_type type = (media_track_type)tmpType;
1077
1078    sp<AMessage> response = new AMessage;
1079    ssize_t index = doGetSelectedTrack(type);
1080    response->setInt32("index", index);
1081
1082    sp<AReplyToken> replyID;
1083    CHECK(msg->senderAwaitsResponse(&replyID));
1084    response->postReply(replyID);
1085}
1086
1087ssize_t NuPlayer::GenericSource::doGetSelectedTrack(media_track_type type) const {
1088    const Track *track = NULL;
1089    switch (type) {
1090    case MEDIA_TRACK_TYPE_VIDEO:
1091        track = &mVideoTrack;
1092        break;
1093    case MEDIA_TRACK_TYPE_AUDIO:
1094        track = &mAudioTrack;
1095        break;
1096    case MEDIA_TRACK_TYPE_TIMEDTEXT:
1097        track = &mTimedTextTrack;
1098        break;
1099    case MEDIA_TRACK_TYPE_SUBTITLE:
1100        track = &mSubtitleTrack;
1101        break;
1102    default:
1103        break;
1104    }
1105
1106    if (track != NULL && track->mSource != NULL) {
1107        return track->mIndex;
1108    }
1109
1110    return -1;
1111}
1112
1113status_t NuPlayer::GenericSource::selectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1114    ALOGV("%s track: %zu", select ? "select" : "deselect", trackIndex);
1115    sp<AMessage> msg = new AMessage(kWhatSelectTrack, this);
1116    msg->setInt32("trackIndex", trackIndex);
1117    msg->setInt32("select", select);
1118    msg->setInt64("timeUs", timeUs);
1119
1120    sp<AMessage> response;
1121    status_t err = msg->postAndAwaitResponse(&response);
1122    if (err == OK && response != NULL) {
1123        CHECK(response->findInt32("err", &err));
1124    }
1125
1126    return err;
1127}
1128
1129void NuPlayer::GenericSource::onSelectTrack(sp<AMessage> msg) {
1130    int32_t trackIndex, select;
1131    int64_t timeUs;
1132    CHECK(msg->findInt32("trackIndex", &trackIndex));
1133    CHECK(msg->findInt32("select", &select));
1134    CHECK(msg->findInt64("timeUs", &timeUs));
1135
1136    sp<AMessage> response = new AMessage;
1137    status_t err = doSelectTrack(trackIndex, select, timeUs);
1138    response->setInt32("err", err);
1139
1140    sp<AReplyToken> replyID;
1141    CHECK(msg->senderAwaitsResponse(&replyID));
1142    response->postReply(replyID);
1143}
1144
1145status_t NuPlayer::GenericSource::doSelectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1146    if (trackIndex >= mSources.size()) {
1147        return BAD_INDEX;
1148    }
1149
1150    if (!select) {
1151        Track* track = NULL;
1152        if (mSubtitleTrack.mSource != NULL && trackIndex == mSubtitleTrack.mIndex) {
1153            track = &mSubtitleTrack;
1154            mFetchSubtitleDataGeneration++;
1155        } else if (mTimedTextTrack.mSource != NULL && trackIndex == mTimedTextTrack.mIndex) {
1156            track = &mTimedTextTrack;
1157            mFetchTimedTextDataGeneration++;
1158        }
1159        if (track == NULL) {
1160            return INVALID_OPERATION;
1161        }
1162        track->mSource->stop();
1163        track->mSource = NULL;
1164        track->mPackets->clear();
1165        return OK;
1166    }
1167
1168    const sp<MediaSource> source = mSources.itemAt(trackIndex);
1169    sp<MetaData> meta = source->getFormat();
1170    const char *mime;
1171    CHECK(meta->findCString(kKeyMIMEType, &mime));
1172    if (!strncasecmp(mime, "text/", 5)) {
1173        bool isSubtitle = strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP);
1174        Track *track = isSubtitle ? &mSubtitleTrack : &mTimedTextTrack;
1175        if (track->mSource != NULL && track->mIndex == trackIndex) {
1176            return OK;
1177        }
1178        track->mIndex = trackIndex;
1179        if (track->mSource != NULL) {
1180            track->mSource->stop();
1181        }
1182        track->mSource = mSources.itemAt(trackIndex);
1183        track->mSource->start();
1184        if (track->mPackets == NULL) {
1185            track->mPackets = new AnotherPacketSource(track->mSource->getFormat());
1186        } else {
1187            track->mPackets->clear();
1188            track->mPackets->setFormat(track->mSource->getFormat());
1189
1190        }
1191
1192        if (isSubtitle) {
1193            mFetchSubtitleDataGeneration++;
1194        } else {
1195            mFetchTimedTextDataGeneration++;
1196        }
1197
1198        status_t eosResult; // ignored
1199        if (mSubtitleTrack.mSource != NULL
1200                && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1201            sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
1202            msg->setInt64("timeUs", timeUs);
1203            msg->setInt32("generation", mFetchSubtitleDataGeneration);
1204            msg->post();
1205        }
1206
1207        if (mTimedTextTrack.mSource != NULL
1208                && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1209            sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
1210            msg->setInt64("timeUs", timeUs);
1211            msg->setInt32("generation", mFetchTimedTextDataGeneration);
1212            msg->post();
1213        }
1214
1215        return OK;
1216    } else if (!strncasecmp(mime, "audio/", 6) || !strncasecmp(mime, "video/", 6)) {
1217        bool audio = !strncasecmp(mime, "audio/", 6);
1218        Track *track = audio ? &mAudioTrack : &mVideoTrack;
1219        if (track->mSource != NULL && track->mIndex == trackIndex) {
1220            return OK;
1221        }
1222
1223        sp<AMessage> msg = new AMessage(kWhatChangeAVSource, this);
1224        msg->setInt32("trackIndex", trackIndex);
1225        msg->post();
1226        return OK;
1227    }
1228
1229    return INVALID_OPERATION;
1230}
1231
1232status_t NuPlayer::GenericSource::seekTo(int64_t seekTimeUs) {
1233    sp<AMessage> msg = new AMessage(kWhatSeek, this);
1234    msg->setInt64("seekTimeUs", seekTimeUs);
1235
1236    sp<AMessage> response;
1237    status_t err = msg->postAndAwaitResponse(&response);
1238    if (err == OK && response != NULL) {
1239        CHECK(response->findInt32("err", &err));
1240    }
1241
1242    return err;
1243}
1244
1245void NuPlayer::GenericSource::onSeek(sp<AMessage> msg) {
1246    int64_t seekTimeUs;
1247    CHECK(msg->findInt64("seekTimeUs", &seekTimeUs));
1248
1249    sp<AMessage> response = new AMessage;
1250    status_t err = doSeek(seekTimeUs);
1251    response->setInt32("err", err);
1252
1253    sp<AReplyToken> replyID;
1254    CHECK(msg->senderAwaitsResponse(&replyID));
1255    response->postReply(replyID);
1256}
1257
1258status_t NuPlayer::GenericSource::doSeek(int64_t seekTimeUs) {
1259    // If the Widevine source is stopped, do not attempt to read any
1260    // more buffers.
1261    if (mStopRead) {
1262        return INVALID_OPERATION;
1263    }
1264    if (mVideoTrack.mSource != NULL) {
1265        int64_t actualTimeUs;
1266        readBuffer(MEDIA_TRACK_TYPE_VIDEO, seekTimeUs, &actualTimeUs);
1267
1268        seekTimeUs = actualTimeUs;
1269        mVideoLastDequeueTimeUs = seekTimeUs;
1270    }
1271
1272    if (mAudioTrack.mSource != NULL) {
1273        readBuffer(MEDIA_TRACK_TYPE_AUDIO, seekTimeUs);
1274        mAudioLastDequeueTimeUs = seekTimeUs;
1275    }
1276
1277    setDrmPlaybackStatusIfNeeded(Playback::START, seekTimeUs / 1000);
1278    if (!mStarted) {
1279        setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
1280    }
1281
1282    // If currently buffering, post kWhatBufferingEnd first, so that
1283    // NuPlayer resumes. Otherwise, if cache hits high watermark
1284    // before new polling happens, no one will resume the playback.
1285    stopBufferingIfNecessary();
1286    restartPollBuffering();
1287
1288    return OK;
1289}
1290
1291sp<ABuffer> NuPlayer::GenericSource::mediaBufferToABuffer(
1292        MediaBuffer* mb,
1293        media_track_type trackType,
1294        int64_t /* seekTimeUs */,
1295        int64_t *actualTimeUs) {
1296    bool audio = trackType == MEDIA_TRACK_TYPE_AUDIO;
1297    size_t outLength = mb->range_length();
1298
1299    if (audio && mAudioIsVorbis) {
1300        outLength += sizeof(int32_t);
1301    }
1302
1303    sp<ABuffer> ab;
1304    if (mIsSecure && !audio) {
1305        // data is already provided in the buffer
1306        ab = new ABuffer(NULL, mb->range_length());
1307        mb->add_ref();
1308        ab->setMediaBufferBase(mb);
1309    } else {
1310        ab = new ABuffer(outLength);
1311        memcpy(ab->data(),
1312               (const uint8_t *)mb->data() + mb->range_offset(),
1313               mb->range_length());
1314    }
1315
1316    if (audio && mAudioIsVorbis) {
1317        int32_t numPageSamples;
1318        if (!mb->meta_data()->findInt32(kKeyValidSamples, &numPageSamples)) {
1319            numPageSamples = -1;
1320        }
1321
1322        uint8_t* abEnd = ab->data() + mb->range_length();
1323        memcpy(abEnd, &numPageSamples, sizeof(numPageSamples));
1324    }
1325
1326    sp<AMessage> meta = ab->meta();
1327
1328    int64_t timeUs;
1329    CHECK(mb->meta_data()->findInt64(kKeyTime, &timeUs));
1330    meta->setInt64("timeUs", timeUs);
1331
1332#if 0
1333    // Temporarily disable pre-roll till we have a full solution to handle
1334    // both single seek and continous seek gracefully.
1335    if (seekTimeUs > timeUs) {
1336        sp<AMessage> extra = new AMessage;
1337        extra->setInt64("resume-at-mediaTimeUs", seekTimeUs);
1338        meta->setMessage("extra", extra);
1339    }
1340#endif
1341
1342    if (trackType == MEDIA_TRACK_TYPE_TIMEDTEXT) {
1343        const char *mime;
1344        CHECK(mTimedTextTrack.mSource != NULL
1345                && mTimedTextTrack.mSource->getFormat()->findCString(kKeyMIMEType, &mime));
1346        meta->setString("mime", mime);
1347    }
1348
1349    int64_t durationUs;
1350    if (mb->meta_data()->findInt64(kKeyDuration, &durationUs)) {
1351        meta->setInt64("durationUs", durationUs);
1352    }
1353
1354    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1355        meta->setInt32("trackIndex", mSubtitleTrack.mIndex);
1356    }
1357
1358    if (actualTimeUs) {
1359        *actualTimeUs = timeUs;
1360    }
1361
1362    mb->release();
1363    mb = NULL;
1364
1365    return ab;
1366}
1367
1368void NuPlayer::GenericSource::postReadBuffer(media_track_type trackType) {
1369    Mutex::Autolock _l(mReadBufferLock);
1370
1371    if ((mPendingReadBufferTypes & (1 << trackType)) == 0) {
1372        mPendingReadBufferTypes |= (1 << trackType);
1373        sp<AMessage> msg = new AMessage(kWhatReadBuffer, this);
1374        msg->setInt32("trackType", trackType);
1375        msg->post();
1376    }
1377}
1378
1379void NuPlayer::GenericSource::onReadBuffer(sp<AMessage> msg) {
1380    int32_t tmpType;
1381    CHECK(msg->findInt32("trackType", &tmpType));
1382    media_track_type trackType = (media_track_type)tmpType;
1383    readBuffer(trackType);
1384    {
1385        // only protect the variable change, as readBuffer may
1386        // take considerable time.
1387        Mutex::Autolock _l(mReadBufferLock);
1388        mPendingReadBufferTypes &= ~(1 << trackType);
1389    }
1390}
1391
1392void NuPlayer::GenericSource::readBuffer(
1393        media_track_type trackType, int64_t seekTimeUs, int64_t *actualTimeUs, bool formatChange) {
1394    // Do not read data if Widevine source is stopped
1395    if (mStopRead) {
1396        return;
1397    }
1398    Track *track;
1399    size_t maxBuffers = 1;
1400    switch (trackType) {
1401        case MEDIA_TRACK_TYPE_VIDEO:
1402            track = &mVideoTrack;
1403            if (mIsWidevine) {
1404                maxBuffers = 2;
1405            }
1406            break;
1407        case MEDIA_TRACK_TYPE_AUDIO:
1408            track = &mAudioTrack;
1409            if (mIsWidevine) {
1410                maxBuffers = 8;
1411            } else {
1412                maxBuffers = 64;
1413            }
1414            break;
1415        case MEDIA_TRACK_TYPE_SUBTITLE:
1416            track = &mSubtitleTrack;
1417            break;
1418        case MEDIA_TRACK_TYPE_TIMEDTEXT:
1419            track = &mTimedTextTrack;
1420            break;
1421        default:
1422            TRESPASS();
1423    }
1424
1425    if (track->mSource == NULL) {
1426        return;
1427    }
1428
1429    if (actualTimeUs) {
1430        *actualTimeUs = seekTimeUs;
1431    }
1432
1433    MediaSource::ReadOptions options;
1434
1435    bool seeking = false;
1436
1437    if (seekTimeUs >= 0) {
1438        options.setSeekTo(seekTimeUs, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
1439        seeking = true;
1440    }
1441
1442    if (mIsWidevine) {
1443        options.setNonBlocking();
1444    }
1445
1446    for (size_t numBuffers = 0; numBuffers < maxBuffers; ) {
1447        MediaBuffer *mbuf;
1448        status_t err = track->mSource->read(&mbuf, &options);
1449
1450        options.clearSeekTo();
1451
1452        if (err == OK) {
1453            int64_t timeUs;
1454            CHECK(mbuf->meta_data()->findInt64(kKeyTime, &timeUs));
1455            if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
1456                mAudioTimeUs = timeUs;
1457            } else if (trackType == MEDIA_TRACK_TYPE_VIDEO) {
1458                mVideoTimeUs = timeUs;
1459            }
1460
1461            // formatChange && seeking: track whose source is changed during selection
1462            // formatChange && !seeking: track whose source is not changed during selection
1463            // !formatChange: normal seek
1464            if ((seeking || formatChange)
1465                    && (trackType == MEDIA_TRACK_TYPE_AUDIO
1466                    || trackType == MEDIA_TRACK_TYPE_VIDEO)) {
1467                ATSParser::DiscontinuityType type = (formatChange && seeking)
1468                        ? ATSParser::DISCONTINUITY_FORMATCHANGE
1469                        : ATSParser::DISCONTINUITY_NONE;
1470                track->mPackets->queueDiscontinuity( type, NULL, true /* discard */);
1471            }
1472
1473            sp<ABuffer> buffer = mediaBufferToABuffer(
1474                    mbuf, trackType, seekTimeUs, actualTimeUs);
1475            track->mPackets->queueAccessUnit(buffer);
1476            formatChange = false;
1477            seeking = false;
1478            ++numBuffers;
1479        } else if (err == WOULD_BLOCK) {
1480            break;
1481        } else if (err == INFO_FORMAT_CHANGED) {
1482#if 0
1483            track->mPackets->queueDiscontinuity(
1484                    ATSParser::DISCONTINUITY_FORMATCHANGE,
1485                    NULL,
1486                    false /* discard */);
1487#endif
1488        } else {
1489            track->mPackets->signalEOS(err);
1490            break;
1491        }
1492    }
1493}
1494
1495}  // namespace android
1496