1 /*
2 * Copyright (C) 2010 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 "MPEG2TSExtractor"
19
20 #include <inttypes.h>
21 #include <utils/Log.h>
22
23 #include "include/MPEG2TSExtractor.h"
24 #include "include/NuCachedSource2.h"
25
26 #include <media/stagefright/foundation/ABuffer.h>
27 #include <media/stagefright/foundation/ADebug.h>
28 #include <media/stagefright/foundation/ALooper.h>
29 #include <media/stagefright/foundation/AUtils.h>
30 #include <media/stagefright/DataSource.h>
31 #include <media/stagefright/MediaDefs.h>
32 #include <media/stagefright/MediaErrors.h>
33 #include <media/stagefright/MediaSource.h>
34 #include <media/stagefright/MetaData.h>
35 #include <media/IStreamSource.h>
36 #include <utils/String8.h>
37
38 #include "AnotherPacketSource.h"
39 #include "ATSParser.h"
40
41 namespace android {
42
43 static const size_t kTSPacketSize = 188;
44 static const int kMaxDurationReadSize = 250000LL;
45 static const int kMaxDurationRetry = 6;
46
47 struct MPEG2TSSource : public MediaSource {
48 MPEG2TSSource(
49 const sp<MPEG2TSExtractor> &extractor,
50 const sp<AnotherPacketSource> &impl,
51 bool doesSeek);
52
53 virtual status_t start(MetaData *params = NULL);
54 virtual status_t stop();
55 virtual sp<MetaData> getFormat();
56
57 virtual status_t read(
58 MediaBuffer **buffer, const ReadOptions *options = NULL);
59
60 private:
61 sp<MPEG2TSExtractor> mExtractor;
62 sp<AnotherPacketSource> mImpl;
63
64 // If there are both audio and video streams, only the video stream
65 // will signal seek on the extractor; otherwise the single stream will seek.
66 bool mDoesSeek;
67
68 DISALLOW_EVIL_CONSTRUCTORS(MPEG2TSSource);
69 };
70
MPEG2TSSource(const sp<MPEG2TSExtractor> & extractor,const sp<AnotherPacketSource> & impl,bool doesSeek)71 MPEG2TSSource::MPEG2TSSource(
72 const sp<MPEG2TSExtractor> &extractor,
73 const sp<AnotherPacketSource> &impl,
74 bool doesSeek)
75 : mExtractor(extractor),
76 mImpl(impl),
77 mDoesSeek(doesSeek) {
78 }
79
start(MetaData * params)80 status_t MPEG2TSSource::start(MetaData *params) {
81 return mImpl->start(params);
82 }
83
stop()84 status_t MPEG2TSSource::stop() {
85 return mImpl->stop();
86 }
87
getFormat()88 sp<MetaData> MPEG2TSSource::getFormat() {
89 return mImpl->getFormat();
90 }
91
read(MediaBuffer ** out,const ReadOptions * options)92 status_t MPEG2TSSource::read(
93 MediaBuffer **out, const ReadOptions *options) {
94 *out = NULL;
95
96 int64_t seekTimeUs;
97 ReadOptions::SeekMode seekMode;
98 if (mDoesSeek && options && options->getSeekTo(&seekTimeUs, &seekMode)) {
99 // seek is needed
100 status_t err = mExtractor->seek(seekTimeUs, seekMode);
101 if (err != OK) {
102 return err;
103 }
104 }
105
106 if (mExtractor->feedUntilBufferAvailable(mImpl) != OK) {
107 return ERROR_END_OF_STREAM;
108 }
109
110 return mImpl->read(out, options);
111 }
112
113 ////////////////////////////////////////////////////////////////////////////////
114
MPEG2TSExtractor(const sp<DataSource> & source)115 MPEG2TSExtractor::MPEG2TSExtractor(const sp<DataSource> &source)
116 : mDataSource(source),
117 mParser(new ATSParser),
118 mLastSyncEvent(0),
119 mOffset(0) {
120 init();
121 }
122
countTracks()123 size_t MPEG2TSExtractor::countTracks() {
124 return mSourceImpls.size();
125 }
126
getTrack(size_t index)127 sp<IMediaSource> MPEG2TSExtractor::getTrack(size_t index) {
128 if (index >= mSourceImpls.size()) {
129 return NULL;
130 }
131
132 // The seek reference track (video if present; audio otherwise) performs
133 // seek requests, while other tracks ignore requests.
134 return new MPEG2TSSource(this, mSourceImpls.editItemAt(index),
135 (mSeekSyncPoints == &mSyncPoints.editItemAt(index)));
136 }
137
getTrackMetaData(size_t index,uint32_t)138 sp<MetaData> MPEG2TSExtractor::getTrackMetaData(
139 size_t index, uint32_t /* flags */) {
140 return index < mSourceImpls.size()
141 ? mSourceImpls.editItemAt(index)->getFormat() : NULL;
142 }
143
getMetaData()144 sp<MetaData> MPEG2TSExtractor::getMetaData() {
145 sp<MetaData> meta = new MetaData;
146 meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_CONTAINER_MPEG2TS);
147
148 return meta;
149 }
150
151 //static
isScrambledFormat(const sp<MetaData> & format)152 bool MPEG2TSExtractor::isScrambledFormat(const sp<MetaData> &format) {
153 const char *mime;
154 return format->findCString(kKeyMIMEType, &mime)
155 && (!strcasecmp(MEDIA_MIMETYPE_VIDEO_SCRAMBLED, mime)
156 || !strcasecmp(MEDIA_MIMETYPE_AUDIO_SCRAMBLED, mime));
157 }
158
setMediaCas(const sp<ICas> & cas)159 status_t MPEG2TSExtractor::setMediaCas(const sp<ICas> &cas) {
160 ALOGD("setMediaCas: %p", cas.get());
161
162 status_t err = mParser->setMediaCas(cas);
163 if (err == OK) {
164 ALOGI("All tracks now have descramblers");
165 init();
166 }
167 return err;
168 }
169
addSource(const sp<AnotherPacketSource> & impl)170 void MPEG2TSExtractor::addSource(const sp<AnotherPacketSource> &impl) {
171 bool found = false;
172 for (size_t i = 0; i < mSourceImpls.size(); i++) {
173 if (mSourceImpls[i] == impl) {
174 found = true;
175 break;
176 }
177 }
178 if (!found) {
179 mSourceImpls.push(impl);
180 }
181 }
182
init()183 void MPEG2TSExtractor::init() {
184 bool haveAudio = false;
185 bool haveVideo = false;
186 int64_t startTime = ALooper::GetNowUs();
187
188 status_t err;
189 while ((err = feedMore(true /* isInit */)) == OK
190 || err == ERROR_DRM_DECRYPT_UNIT_NOT_INITIALIZED) {
191 if (haveAudio && haveVideo) {
192 addSyncPoint_l(mLastSyncEvent);
193 mLastSyncEvent.reset();
194 break;
195 }
196 if (!haveVideo) {
197 sp<AnotherPacketSource> impl =
198 (AnotherPacketSource *)mParser->getSource(
199 ATSParser::VIDEO).get();
200
201 if (impl != NULL) {
202 sp<MetaData> format = impl->getFormat();
203 if (format != NULL) {
204 haveVideo = true;
205 addSource(impl);
206 if (!isScrambledFormat(format)) {
207 mSyncPoints.push();
208 mSeekSyncPoints = &mSyncPoints.editTop();
209 }
210 }
211 }
212 }
213
214 if (!haveAudio) {
215 sp<AnotherPacketSource> impl =
216 (AnotherPacketSource *)mParser->getSource(
217 ATSParser::AUDIO).get();
218
219 if (impl != NULL) {
220 sp<MetaData> format = impl->getFormat();
221 if (format != NULL) {
222 haveAudio = true;
223 addSource(impl);
224 if (!isScrambledFormat(format)) {
225 mSyncPoints.push();
226 if (!haveVideo) {
227 mSeekSyncPoints = &mSyncPoints.editTop();
228 }
229 }
230 }
231 }
232 }
233
234 addSyncPoint_l(mLastSyncEvent);
235 mLastSyncEvent.reset();
236
237 // ERROR_DRM_DECRYPT_UNIT_NOT_INITIALIZED is returned when the mpeg2ts
238 // is scrambled but we don't have a MediaCas object set. The extraction
239 // will only continue when setMediaCas() is called successfully.
240 if (err == ERROR_DRM_DECRYPT_UNIT_NOT_INITIALIZED) {
241 ALOGI("stopped parsing scrambled content, "
242 "haveAudio=%d, haveVideo=%d, elaspedTime=%" PRId64,
243 haveAudio, haveVideo, ALooper::GetNowUs() - startTime);
244 return;
245 }
246
247 // Wait only for 2 seconds to detect audio/video streams.
248 if (ALooper::GetNowUs() - startTime > 2000000ll) {
249 break;
250 }
251 }
252
253 off64_t size;
254 if (mDataSource->getSize(&size) == OK && (haveAudio || haveVideo)) {
255 sp<AnotherPacketSource> impl = haveVideo
256 ? (AnotherPacketSource *)mParser->getSource(
257 ATSParser::VIDEO).get()
258 : (AnotherPacketSource *)mParser->getSource(
259 ATSParser::AUDIO).get();
260 size_t prevSyncSize = 1;
261 int64_t durationUs = -1;
262 List<int64_t> durations;
263 // Estimate duration --- stabilize until you get <500ms deviation.
264 while (feedMore() == OK
265 && ALooper::GetNowUs() - startTime <= 2000000ll) {
266 if (mSeekSyncPoints->size() > prevSyncSize) {
267 prevSyncSize = mSeekSyncPoints->size();
268 int64_t diffUs = mSeekSyncPoints->keyAt(prevSyncSize - 1)
269 - mSeekSyncPoints->keyAt(0);
270 off64_t diffOffset = mSeekSyncPoints->valueAt(prevSyncSize - 1)
271 - mSeekSyncPoints->valueAt(0);
272 int64_t currentDurationUs = size * diffUs / diffOffset;
273 durations.push_back(currentDurationUs);
274 if (durations.size() > 5) {
275 durations.erase(durations.begin());
276 int64_t min = *durations.begin();
277 int64_t max = *durations.begin();
278 for (auto duration : durations) {
279 if (min > duration) {
280 min = duration;
281 }
282 if (max < duration) {
283 max = duration;
284 }
285 }
286 if (max - min < 500 * 1000) {
287 durationUs = currentDurationUs;
288 break;
289 }
290 }
291 }
292 }
293 status_t err;
294 int64_t bufferedDurationUs;
295 bufferedDurationUs = impl->getBufferedDurationUs(&err);
296 if (err == ERROR_END_OF_STREAM) {
297 durationUs = bufferedDurationUs;
298 }
299 if (durationUs > 0) {
300 const sp<MetaData> meta = impl->getFormat();
301 meta->setInt64(kKeyDuration, durationUs);
302 impl->setFormat(meta);
303 } else {
304 estimateDurationsFromTimesUsAtEnd();
305 }
306 }
307
308 ALOGI("haveAudio=%d, haveVideo=%d, elaspedTime=%" PRId64,
309 haveAudio, haveVideo, ALooper::GetNowUs() - startTime);
310 }
311
feedMore(bool isInit)312 status_t MPEG2TSExtractor::feedMore(bool isInit) {
313 Mutex::Autolock autoLock(mLock);
314
315 uint8_t packet[kTSPacketSize];
316 ssize_t n = mDataSource->readAt(mOffset, packet, kTSPacketSize);
317
318 if (n < (ssize_t)kTSPacketSize) {
319 if (n >= 0) {
320 mParser->signalEOS(ERROR_END_OF_STREAM);
321 }
322 return (n < 0) ? (status_t)n : ERROR_END_OF_STREAM;
323 }
324
325 ATSParser::SyncEvent event(mOffset);
326 mOffset += n;
327 status_t err = mParser->feedTSPacket(packet, kTSPacketSize, &event);
328 if (event.hasReturnedData()) {
329 if (isInit) {
330 mLastSyncEvent = event;
331 } else {
332 addSyncPoint_l(event);
333 }
334 }
335 return err;
336 }
337
addSyncPoint_l(const ATSParser::SyncEvent & event)338 void MPEG2TSExtractor::addSyncPoint_l(const ATSParser::SyncEvent &event) {
339 if (!event.hasReturnedData()) {
340 return;
341 }
342
343 for (size_t i = 0; i < mSourceImpls.size(); ++i) {
344 if (mSourceImpls[i].get() == event.getMediaSource().get()) {
345 KeyedVector<int64_t, off64_t> *syncPoints = &mSyncPoints.editItemAt(i);
346 syncPoints->add(event.getTimeUs(), event.getOffset());
347 // We're keeping the size of the sync points at most 5mb per a track.
348 size_t size = syncPoints->size();
349 if (size >= 327680) {
350 int64_t firstTimeUs = syncPoints->keyAt(0);
351 int64_t lastTimeUs = syncPoints->keyAt(size - 1);
352 if (event.getTimeUs() - firstTimeUs > lastTimeUs - event.getTimeUs()) {
353 syncPoints->removeItemsAt(0, 4096);
354 } else {
355 syncPoints->removeItemsAt(size - 4096, 4096);
356 }
357 }
358 break;
359 }
360 }
361 }
362
estimateDurationsFromTimesUsAtEnd()363 status_t MPEG2TSExtractor::estimateDurationsFromTimesUsAtEnd() {
364 if (!(mDataSource->flags() & DataSource::kIsLocalFileSource)) {
365 return ERROR_UNSUPPORTED;
366 }
367
368 off64_t size = 0;
369 status_t err = mDataSource->getSize(&size);
370 if (err != OK) {
371 return err;
372 }
373
374 uint8_t packet[kTSPacketSize];
375 const off64_t zero = 0;
376 off64_t offset = max(zero, size - kMaxDurationReadSize);
377 if (mDataSource->readAt(offset, &packet, 0) < 0) {
378 return ERROR_IO;
379 }
380
381 int retry = 0;
382 bool allDurationsFound = false;
383 int64_t timeAnchorUs = mParser->getFirstPTSTimeUs();
384 do {
385 int bytesRead = 0;
386 sp<ATSParser> parser = new ATSParser(ATSParser::TS_TIMESTAMPS_ARE_ABSOLUTE);
387 ATSParser::SyncEvent ev(0);
388 offset = max(zero, size - (kMaxDurationReadSize << retry));
389 offset = (offset / kTSPacketSize) * kTSPacketSize;
390 for (;;) {
391 if (bytesRead >= kMaxDurationReadSize << max(0, retry - 1)) {
392 break;
393 }
394
395 ssize_t n = mDataSource->readAt(offset, packet, kTSPacketSize);
396 if (n < 0) {
397 return n;
398 } else if (n < (ssize_t)kTSPacketSize) {
399 break;
400 }
401
402 offset += kTSPacketSize;
403 bytesRead += kTSPacketSize;
404 err = parser->feedTSPacket(packet, kTSPacketSize, &ev);
405 if (err != OK) {
406 return err;
407 }
408
409 if (ev.hasReturnedData()) {
410 int64_t durationUs = ev.getTimeUs();
411 ATSParser::SourceType type = ev.getType();
412 ev.reset();
413
414 int64_t firstTimeUs;
415 sp<AnotherPacketSource> src =
416 (AnotherPacketSource *)mParser->getSource(type).get();
417 if (src == NULL || src->nextBufferTime(&firstTimeUs) != OK) {
418 continue;
419 }
420 durationUs += src->getEstimatedBufferDurationUs();
421 durationUs -= timeAnchorUs;
422 durationUs -= firstTimeUs;
423 if (durationUs > 0) {
424 int64_t origDurationUs, lastDurationUs;
425 const sp<MetaData> meta = src->getFormat();
426 const uint32_t kKeyLastDuration = 'ldur';
427 // Require two consecutive duration calculations to be within 1 sec before
428 // updating; use MetaData to store previous duration estimate in per-stream
429 // context.
430 if (!meta->findInt64(kKeyDuration, &origDurationUs)
431 || !meta->findInt64(kKeyLastDuration, &lastDurationUs)
432 || (origDurationUs < durationUs
433 && abs(durationUs - lastDurationUs) < 60000000)) {
434 meta->setInt64(kKeyDuration, durationUs);
435 }
436 meta->setInt64(kKeyLastDuration, durationUs);
437 }
438 }
439 }
440
441 if (!allDurationsFound) {
442 allDurationsFound = true;
443 for (auto t: {ATSParser::VIDEO, ATSParser::AUDIO}) {
444 sp<AnotherPacketSource> src = (AnotherPacketSource *)mParser->getSource(t).get();
445 if (src == NULL) {
446 continue;
447 }
448 int64_t durationUs;
449 const sp<MetaData> meta = src->getFormat();
450 if (!meta->findInt64(kKeyDuration, &durationUs)) {
451 allDurationsFound = false;
452 break;
453 }
454 }
455 }
456
457 ++retry;
458 } while(!allDurationsFound && offset > 0 && retry <= kMaxDurationRetry);
459
460 return allDurationsFound? OK : ERROR_UNSUPPORTED;
461 }
462
flags() const463 uint32_t MPEG2TSExtractor::flags() const {
464 return CAN_PAUSE | CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD;
465 }
466
seek(int64_t seekTimeUs,const MediaSource::ReadOptions::SeekMode & seekMode)467 status_t MPEG2TSExtractor::seek(int64_t seekTimeUs,
468 const MediaSource::ReadOptions::SeekMode &seekMode) {
469 if (mSeekSyncPoints == NULL || mSeekSyncPoints->isEmpty()) {
470 ALOGW("No sync point to seek to.");
471 // ... and therefore we have nothing useful to do here.
472 return OK;
473 }
474
475 // Determine whether we're seeking beyond the known area.
476 bool shouldSeekBeyond =
477 (seekTimeUs > mSeekSyncPoints->keyAt(mSeekSyncPoints->size() - 1));
478
479 // Determine the sync point to seek.
480 size_t index = 0;
481 for (; index < mSeekSyncPoints->size(); ++index) {
482 int64_t timeUs = mSeekSyncPoints->keyAt(index);
483 if (timeUs > seekTimeUs) {
484 break;
485 }
486 }
487
488 switch (seekMode) {
489 case MediaSource::ReadOptions::SEEK_NEXT_SYNC:
490 if (index == mSeekSyncPoints->size()) {
491 ALOGW("Next sync not found; starting from the latest sync.");
492 --index;
493 }
494 break;
495 case MediaSource::ReadOptions::SEEK_CLOSEST_SYNC:
496 case MediaSource::ReadOptions::SEEK_CLOSEST:
497 ALOGW("seekMode not supported: %d; falling back to PREVIOUS_SYNC",
498 seekMode);
499 // fall-through
500 case MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC:
501 if (index == 0) {
502 ALOGW("Previous sync not found; starting from the earliest "
503 "sync.");
504 } else {
505 --index;
506 }
507 break;
508 }
509 if (!shouldSeekBeyond || mOffset <= mSeekSyncPoints->valueAt(index)) {
510 int64_t actualSeekTimeUs = mSeekSyncPoints->keyAt(index);
511 mOffset = mSeekSyncPoints->valueAt(index);
512 status_t err = queueDiscontinuityForSeek(actualSeekTimeUs);
513 if (err != OK) {
514 return err;
515 }
516 }
517
518 if (shouldSeekBeyond) {
519 status_t err = seekBeyond(seekTimeUs);
520 if (err != OK) {
521 return err;
522 }
523 }
524
525 // Fast-forward to sync frame.
526 for (size_t i = 0; i < mSourceImpls.size(); ++i) {
527 const sp<AnotherPacketSource> &impl = mSourceImpls[i];
528 status_t err;
529 feedUntilBufferAvailable(impl);
530 while (impl->hasBufferAvailable(&err)) {
531 sp<AMessage> meta = impl->getMetaAfterLastDequeued(0);
532 sp<ABuffer> buffer;
533 if (meta == NULL) {
534 return UNKNOWN_ERROR;
535 }
536 int32_t sync;
537 if (meta->findInt32("isSync", &sync) && sync) {
538 break;
539 }
540 err = impl->dequeueAccessUnit(&buffer);
541 if (err != OK) {
542 return err;
543 }
544 feedUntilBufferAvailable(impl);
545 }
546 }
547
548 return OK;
549 }
550
queueDiscontinuityForSeek(int64_t actualSeekTimeUs)551 status_t MPEG2TSExtractor::queueDiscontinuityForSeek(int64_t actualSeekTimeUs) {
552 // Signal discontinuity
553 sp<AMessage> extra(new AMessage);
554 extra->setInt64(IStreamListener::kKeyMediaTimeUs, actualSeekTimeUs);
555 mParser->signalDiscontinuity(ATSParser::DISCONTINUITY_TIME, extra);
556
557 // After discontinuity, impl should only have discontinuities
558 // with the last being what we queued. Dequeue them all here.
559 for (size_t i = 0; i < mSourceImpls.size(); ++i) {
560 const sp<AnotherPacketSource> &impl = mSourceImpls.itemAt(i);
561 sp<ABuffer> buffer;
562 status_t err;
563 while (impl->hasBufferAvailable(&err)) {
564 if (err != OK) {
565 return err;
566 }
567 err = impl->dequeueAccessUnit(&buffer);
568 // If the source contains anything but discontinuity, that's
569 // a programming mistake.
570 CHECK(err == INFO_DISCONTINUITY);
571 }
572 }
573
574 // Feed until we have a buffer for each source.
575 for (size_t i = 0; i < mSourceImpls.size(); ++i) {
576 const sp<AnotherPacketSource> &impl = mSourceImpls.itemAt(i);
577 sp<ABuffer> buffer;
578 status_t err = feedUntilBufferAvailable(impl);
579 if (err != OK) {
580 return err;
581 }
582 }
583
584 return OK;
585 }
586
seekBeyond(int64_t seekTimeUs)587 status_t MPEG2TSExtractor::seekBeyond(int64_t seekTimeUs) {
588 // If we're seeking beyond where we know --- read until we reach there.
589 size_t syncPointsSize = mSeekSyncPoints->size();
590
591 while (seekTimeUs > mSeekSyncPoints->keyAt(
592 mSeekSyncPoints->size() - 1)) {
593 status_t err;
594 if (syncPointsSize < mSeekSyncPoints->size()) {
595 syncPointsSize = mSeekSyncPoints->size();
596 int64_t syncTimeUs = mSeekSyncPoints->keyAt(syncPointsSize - 1);
597 // Dequeue buffers before sync point in order to avoid too much
598 // cache building up.
599 sp<ABuffer> buffer;
600 for (size_t i = 0; i < mSourceImpls.size(); ++i) {
601 const sp<AnotherPacketSource> &impl = mSourceImpls[i];
602 int64_t timeUs;
603 while ((err = impl->nextBufferTime(&timeUs)) == OK) {
604 if (timeUs < syncTimeUs) {
605 impl->dequeueAccessUnit(&buffer);
606 } else {
607 break;
608 }
609 }
610 if (err != OK && err != -EWOULDBLOCK) {
611 return err;
612 }
613 }
614 }
615 if (feedMore() != OK) {
616 return ERROR_END_OF_STREAM;
617 }
618 }
619
620 return OK;
621 }
622
feedUntilBufferAvailable(const sp<AnotherPacketSource> & impl)623 status_t MPEG2TSExtractor::feedUntilBufferAvailable(
624 const sp<AnotherPacketSource> &impl) {
625 status_t finalResult;
626 while (!impl->hasBufferAvailable(&finalResult)) {
627 if (finalResult != OK) {
628 return finalResult;
629 }
630
631 status_t err = feedMore();
632 if (err != OK) {
633 impl->signalEOS(err);
634 }
635 }
636 return OK;
637 }
638
639 ////////////////////////////////////////////////////////////////////////////////
640
SniffMPEG2TS(const sp<DataSource> & source,String8 * mimeType,float * confidence,sp<AMessage> *)641 bool SniffMPEG2TS(
642 const sp<DataSource> &source, String8 *mimeType, float *confidence,
643 sp<AMessage> *) {
644 for (int i = 0; i < 5; ++i) {
645 char header;
646 if (source->readAt(kTSPacketSize * i, &header, 1) != 1
647 || header != 0x47) {
648 return false;
649 }
650 }
651
652 *confidence = 0.1f;
653 mimeType->setTo(MEDIA_MIMETYPE_CONTAINER_MPEG2TS);
654
655 return true;
656 }
657
658 } // namespace android
659