android_AudioSfDecoder.cpp revision 1a9c2615d0933d183fcb1b9e34ec8f0da2a85153 
1/*
2 * Copyright (C) 2011 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 USE_LOG SLAndroidLogLevel_Verbose
18
19#include "sles_allinclusive.h"
20#include "android/android_AudioSfDecoder.h"
21
22#include <media/stagefright/foundation/ADebug.h>
23
24
25#define SIZE_CACHED_HIGH_BYTES 1000000
26#define SIZE_CACHED_MED_BYTES   700000
27#define SIZE_CACHED_LOW_BYTES   400000
28
29namespace android {
30
31// keep in sync with the entries of kPcmDecodeMetadataKeys[] defined in android_AudioSfDecoder.h
32#define ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS   0
33#define ANDROID_KEY_INDEX_PCMFORMAT_SAMPLESPERSEC 1
34#define ANDROID_KEY_INDEX_PCMFORMAT_BITSPERSAMPLE 2
35#define ANDROID_KEY_INDEX_PCMFORMAT_CONTAINERSIZE 3
36#define ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK   4
37#define ANDROID_KEY_INDEX_PCMFORMAT_ENDIANNESS    5
38
39//--------------------------------------------------------------------------------------------------
40AudioSfDecoder::AudioSfDecoder(const AudioPlayback_Parameters* params) : GenericPlayer(params),
41        mDataSource(0),
42        mAudioSource(0),
43        mAudioSourceStarted(false),
44        mBitrate(-1),
45        mChannelMask(UNKNOWN_CHANNELMASK),
46        mDurationUsec(-1),
47        mDecodeBuffer(NULL),
48        mTimeDelta(-1),
49        mSeekTimeMsec(0),
50        mLastDecodedPositionUs(-1),
51        mPcmFormatKeyCount(0),
52        mGetPcmFormatKeyCount(false)
53{
54    SL_LOGV("AudioSfDecoder::AudioSfDecoder()");
55}
56
57
58AudioSfDecoder::~AudioSfDecoder() {
59    SL_LOGV("AudioSfDecoder::~AudioSfDecoder()");
60}
61
62
63void AudioSfDecoder::preDestroy() {
64    GenericPlayer::preDestroy();
65    SL_LOGD("AudioSfDecoder::preDestroy()");
66    {
67        Mutex::Autolock _l(mBufferSourceLock);
68
69        if (NULL != mDecodeBuffer) {
70            mDecodeBuffer->release();
71            mDecodeBuffer = NULL;
72        }
73
74        if ((mAudioSource != 0) && mAudioSourceStarted) {
75            mAudioSource->stop();
76            mAudioSourceStarted = false;
77        }
78    }
79}
80
81
82//--------------------------------------------------
83void AudioSfDecoder::play() {
84    SL_LOGV("AudioSfDecoder::play");
85
86    GenericPlayer::play();
87    (new AMessage(kWhatDecode, id()))->post();
88}
89
90
91void AudioSfDecoder::startPrefetch_async() {
92    SL_LOGV("AudioSfDecoder::startPrefetch_async()");
93
94    if (wantPrefetch()) {
95        SL_LOGV("AudioSfDecoder::startPrefetch_async(): sending check cache msg");
96
97        mStateFlags |= kFlagPreparing | kFlagBuffering;
98
99        (new AMessage(kWhatCheckCache, id()))->post();
100    }
101}
102
103
104//--------------------------------------------------
105uint32_t AudioSfDecoder::getPcmFormatKeyCount() {
106    android::Mutex::Autolock autoLock(mGetPcmFormatLockSingleton);
107    mGetPcmFormatKeyCount = false;
108    (new AMessage(kWhatGetPcmFormat, id()))->post();
109    {
110        android::Mutex::Autolock autoLock(mGetPcmFormatLock);
111        while (!mGetPcmFormatKeyCount) {
112            mGetPcmFormatCondition.wait(mGetPcmFormatLock);
113        }
114    }
115    mGetPcmFormatKeyCount = false;
116    return mPcmFormatKeyCount;
117}
118
119
120//--------------------------------------------------
121bool AudioSfDecoder::getPcmFormatKeySize(uint32_t index, uint32_t* pKeySize) {
122    uint32_t keyCount = getPcmFormatKeyCount();
123    if (index >= keyCount) {
124        return false;
125    } else {
126        *pKeySize = strlen(kPcmDecodeMetadataKeys[index]) +1;
127        return true;
128    }
129}
130
131
132//--------------------------------------------------
133bool AudioSfDecoder::getPcmFormatKeyName(uint32_t index, uint32_t keySize, char* keyName) {
134    uint32_t actualKeySize;
135    if (!getPcmFormatKeySize(index, &actualKeySize)) {
136        return false;
137    }
138    if (keySize < actualKeySize) {
139        return false;
140    }
141    strncpy(keyName, kPcmDecodeMetadataKeys[index], actualKeySize);
142    return true;
143}
144
145
146//--------------------------------------------------
147bool AudioSfDecoder::getPcmFormatValueSize(uint32_t index, uint32_t* pValueSize) {
148    uint32_t keyCount = getPcmFormatKeyCount();
149    if (index >= keyCount) {
150        *pValueSize = 0;
151        return false;
152    } else {
153        *pValueSize = sizeof(uint32_t);
154        return true;
155    }
156}
157
158
159//--------------------------------------------------
160bool AudioSfDecoder::getPcmFormatKeyValue(uint32_t index, uint32_t size, uint32_t* pValue) {
161    uint32_t valueSize = 0;
162    if (!getPcmFormatValueSize(index, &valueSize)) {
163        return false;
164    } else if (size != valueSize) {
165        // this ensures we are accessing mPcmFormatValues with a valid size for that index
166        SL_LOGE("Error retrieving metadata value at index %d: using size of %d, should be %d",
167                index, size, valueSize);
168        return false;
169    } else {
170        *pValue = mPcmFormatValues[index];
171        return true;
172    }
173}
174
175
176//--------------------------------------------------
177// Event handlers
178//  it is strictly verboten to call those methods outside of the event loop
179
180// Initializes the data and audio sources, and update the PCM format info
181// post-condition: upon successful initialization based on the player data locator
182//    GenericPlayer::onPrepare() was called
183//    mDataSource != 0
184//    mAudioSource != 0
185//    mAudioSourceStarted == true
186void AudioSfDecoder::onPrepare() {
187    SL_LOGD("AudioSfDecoder::onPrepare()");
188    Mutex::Autolock _l(mBufferSourceLock);
189
190    // Initialize the PCM format info with the known parameters before the start of the decode
191    mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_BITSPERSAMPLE] = SL_PCMSAMPLEFORMAT_FIXED_16;
192    mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CONTAINERSIZE] = 16;
193    mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_ENDIANNESS] = SL_BYTEORDER_LITTLEENDIAN;
194    //    initialization with the default values: they will be replaced by the actual values
195    //      once the decoder has figured them out
196    mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS] = mChannelCount;
197    mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_SAMPLESPERSEC] = mSampleRateHz;
198    mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK] = mChannelMask;
199
200    //---------------------------------
201    // Instantiate and initialize the data source for the decoder
202    sp<DataSource> dataSource;
203
204    switch (mDataLocatorType) {
205
206    case kDataLocatorNone:
207        SL_LOGE("AudioSfDecoder::onPrepare: no data locator set");
208        notifyPrepared(MEDIA_ERROR_BASE);
209        return;
210
211    case kDataLocatorUri:
212        dataSource = DataSource::CreateFromURI(mDataLocator.uriRef);
213        if (dataSource == NULL) {
214            SL_LOGE("AudioSfDecoder::onPrepare(): Error opening %s", mDataLocator.uriRef);
215            notifyPrepared(MEDIA_ERROR_BASE);
216            return;
217        }
218        break;
219
220    case kDataLocatorFd:
221    {
222        dataSource = new FileSource(
223                mDataLocator.fdi.fd, mDataLocator.fdi.offset, mDataLocator.fdi.length);
224        status_t err = dataSource->initCheck();
225        if (err != OK) {
226            notifyPrepared(err);
227            return;
228        }
229        break;
230    }
231
232    default:
233        TRESPASS();
234    }
235
236    //---------------------------------
237    // Instanciate and initialize the decoder attached to the data source
238    sp<MediaExtractor> extractor = MediaExtractor::Create(dataSource);
239    if (extractor == NULL) {
240        SL_LOGE("AudioSfDecoder::onPrepare: Could not instantiate extractor.");
241        notifyPrepared(ERROR_UNSUPPORTED);
242        return;
243    }
244
245    ssize_t audioTrackIndex = -1;
246    bool isRawAudio = false;
247    for (size_t i = 0; i < extractor->countTracks(); ++i) {
248        sp<MetaData> meta = extractor->getTrackMetaData(i);
249
250        const char *mime;
251        CHECK(meta->findCString(kKeyMIMEType, &mime));
252
253        if (!strncasecmp("audio/", mime, 6)) {
254            audioTrackIndex = i;
255
256            if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_RAW, mime)) {
257                isRawAudio = true;
258            }
259            break;
260        }
261    }
262
263    if (audioTrackIndex < 0) {
264        SL_LOGE("AudioSfDecoder::onPrepare: Could not find a supported audio track.");
265        notifyPrepared(ERROR_UNSUPPORTED);
266        return;
267    }
268
269    sp<MediaSource> source = extractor->getTrack(audioTrackIndex);
270    sp<MetaData> meta = source->getFormat();
271
272    bool hasChannelCount = meta->findInt32(kKeyChannelCount, &mChannelCount);
273    if (hasChannelCount) {
274        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS] = mChannelCount;
275    }
276
277    off64_t size;
278    int64_t durationUs;
279    if (dataSource->getSize(&size) == OK
280            && meta->findInt64(kKeyDuration, &durationUs)) {
281        mBitrate = size * 8000000ll / durationUs;  // in bits/sec
282        mDurationUsec = durationUs;
283        mDurationMsec = durationUs / 1000;
284    } else {
285        mBitrate = -1;
286        mDurationUsec = -1;
287    }
288
289    // the audio content is not raw PCM, so we need a decoder
290    if (!isRawAudio) {
291        OMXClient client;
292        CHECK_EQ(client.connect(), (status_t)OK);
293
294        source = OMXCodec::Create(
295                client.interface(), meta, false /* createEncoder */,
296                source);
297
298        if (source == NULL) {
299            SL_LOGE("AudioSfDecoder::onPrepare: Could not instantiate decoder.");
300            notifyPrepared(ERROR_UNSUPPORTED);
301            return;
302        }
303
304        meta = source->getFormat();
305    }
306
307
308    if (source->start() != OK) {
309        SL_LOGE("AudioSfDecoder::onPrepare: Failed to start source/decoder.");
310        notifyPrepared(MEDIA_ERROR_BASE);
311        return;
312    }
313
314    //---------------------------------
315    // The data source, and audio source (a decoder if required) are ready to be used
316    mDataSource = dataSource;
317    mAudioSource = source;
318    mAudioSourceStarted = true;
319
320    if (!hasChannelCount) {
321        // even though the channel count was already queried above, there are issues with some
322        // OMXCodecs (e.g. MP3 software decoder) not reporting the right count,
323        // we trust the first reported value.
324        CHECK(meta->findInt32(kKeyChannelCount, &mChannelCount));
325        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS] = mChannelCount;
326    }
327    int32_t sr;
328    CHECK(meta->findInt32(kKeySampleRate, &sr));
329    mSampleRateHz = (uint32_t) sr;
330    mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_SAMPLESPERSEC] = mSampleRateHz;
331    // FIXME add code below once channel mask support is in, currently initialized to default
332    //    if (meta->findInt32(kKeyChannelMask, &mChannelMask)) {
333    //        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK] = mChannelMask;
334    //    }
335
336    if (!wantPrefetch()) {
337        SL_LOGV("AudioSfDecoder::onPrepare: no need to prefetch");
338        // doesn't need prefetching, notify good to go
339        mCacheStatus = kStatusHigh;
340        mCacheFill = 1000;
341        notifyStatus();
342        notifyCacheFill();
343    }
344
345    // at this point we have enough information about the source to create the sink that
346    // will consume the data
347    createAudioSink();
348
349    GenericPlayer::onPrepare();
350    SL_LOGD("AudioSfDecoder::onPrepare() done, mStateFlags=0x%x", mStateFlags);
351}
352
353
354void AudioSfDecoder::onPause() {
355    SL_LOGD("AudioSfDecoder::onPause()");
356    GenericPlayer::onPause();
357    pauseAudioSink();
358}
359
360
361void AudioSfDecoder::onPlay() {
362    SL_LOGD("AudioSfDecoder::onPlay()");
363    GenericPlayer::onPlay();
364    startAudioSink();
365}
366
367
368void AudioSfDecoder::onSeek(const sp<AMessage> &msg) {
369    SL_LOGV("AudioSfDecoder::onSeek");
370    int64_t timeMsec;
371    CHECK(msg->findInt64(WHATPARAM_SEEK_SEEKTIME_MS, &timeMsec));
372
373    Mutex::Autolock _l(mSeekLock);
374    mStateFlags |= kFlagSeeking;
375    mSeekTimeMsec = timeMsec;
376    mTimeDelta = -1;
377    mLastDecodedPositionUs = -1;
378}
379
380
381void AudioSfDecoder::onLoop(const sp<AMessage> &msg) {
382    SL_LOGV("AudioSfDecoder::onLoop");
383    int32_t loop;
384    CHECK(msg->findInt32(WHATPARAM_LOOP_LOOPING, &loop));
385
386    if (loop) {
387        //SL_LOGV("AudioSfDecoder::onLoop start looping");
388        mStateFlags |= kFlagLooping;
389    } else {
390        //SL_LOGV("AudioSfDecoder::onLoop stop looping");
391        mStateFlags &= ~kFlagLooping;
392    }
393}
394
395
396void AudioSfDecoder::onGetPcmFormatKeyCount() {
397    SL_LOGV("AudioSfDecoder::onGetPcmFormatKeyCount");
398    {
399        android::Mutex::Autolock autoLock(mGetPcmFormatLock);
400
401        if (!(mStateFlags & kFlagPrepared)) {
402            mPcmFormatKeyCount = 0;
403        } else {
404            mPcmFormatKeyCount = NB_PCMMETADATA_KEYS;
405        }
406
407        mGetPcmFormatKeyCount = true;
408        mGetPcmFormatCondition.signal();
409    }
410
411}
412
413
414void AudioSfDecoder::onCheckCache(const sp<AMessage> &msg) {
415    //SL_LOGV("AudioSfDecoder::onCheckCache");
416    bool eos;
417    CacheStatus_t status = getCacheRemaining(&eos);
418
419    if (eos || status == kStatusHigh
420            || ((mStateFlags & kFlagPreparing) && (status >= kStatusEnough))) {
421        if (mStateFlags & kFlagPlaying) {
422            startAudioSink();
423        }
424        mStateFlags &= ~kFlagBuffering;
425
426        SL_LOGV("AudioSfDecoder::onCheckCache: buffering done.");
427
428        if (mStateFlags & kFlagPreparing) {
429            //SL_LOGV("AudioSfDecoder::onCheckCache: preparation done.");
430            mStateFlags &= ~kFlagPreparing;
431        }
432
433        mTimeDelta = -1;
434        if (mStateFlags & kFlagPlaying) {
435            (new AMessage(kWhatDecode, id()))->post();
436        }
437        return;
438    }
439
440    msg->post(100000);
441}
442
443
444void AudioSfDecoder::onDecode() {
445    SL_LOGV("AudioSfDecoder::onDecode");
446
447    //-------------------------------- Need to buffer some more before decoding?
448    bool eos;
449    if (mDataSource == 0) {
450        // application set play state to paused which failed, then set play state to playing
451        return;
452    }
453
454    if (wantPrefetch()
455            && (getCacheRemaining(&eos) == kStatusLow)
456            && !eos) {
457        SL_LOGV("buffering more.");
458
459        if (mStateFlags & kFlagPlaying) {
460            pauseAudioSink();
461        }
462        mStateFlags |= kFlagBuffering;
463        (new AMessage(kWhatCheckCache, id()))->post(100000);
464        return;
465    }
466
467    if (!(mStateFlags & (kFlagPlaying | kFlagBuffering | kFlagPreparing))) {
468        // don't decode if we're not buffering, prefetching or playing
469        //SL_LOGV("don't decode: not buffering, prefetching or playing");
470        return;
471    }
472
473    //-------------------------------- Decode
474    status_t err;
475    MediaSource::ReadOptions readOptions;
476    if (mStateFlags & kFlagSeeking) {
477        readOptions.setSeekTo(mSeekTimeMsec * 1000);
478    }
479
480    {
481        Mutex::Autolock _l(mBufferSourceLock);
482
483        if (NULL != mDecodeBuffer) {
484            // the current decoded buffer hasn't been rendered, drop it
485            mDecodeBuffer->release();
486            mDecodeBuffer = NULL;
487        }
488        if(!mAudioSourceStarted) {
489            return;
490        }
491        err = mAudioSource->read(&mDecodeBuffer, &readOptions);
492        if (err == OK) {
493            CHECK(mDecodeBuffer->meta_data()->findInt64(kKeyTime, &mLastDecodedPositionUs));
494        }
495    }
496
497    {
498        Mutex::Autolock _l(mSeekLock);
499        if (mStateFlags & kFlagSeeking) {
500            mStateFlags &= ~kFlagSeeking;
501        }
502    }
503
504    //-------------------------------- Handle return of decode
505    if (err != OK) {
506        bool continueDecoding = false;
507        switch(err) {
508            case ERROR_END_OF_STREAM:
509                if (0 < mDurationUsec) {
510                    mLastDecodedPositionUs = mDurationUsec;
511                }
512                // handle notification and looping at end of stream
513                if (mStateFlags & kFlagPlaying) {
514                    notify(PLAYEREVENT_ENDOFSTREAM, 1, true);
515                }
516                if (mStateFlags & kFlagLooping) {
517                    seek(0);
518                    // kick-off decoding again
519                    continueDecoding = true;
520                }
521                break;
522            case INFO_FORMAT_CHANGED:
523                SL_LOGD("MediaSource::read encountered INFO_FORMAT_CHANGED");
524                // reconfigure output
525                updateAudioSink();
526                continueDecoding = true;
527                break;
528            case INFO_DISCONTINUITY:
529                SL_LOGD("MediaSource::read encountered INFO_DISCONTINUITY");
530                continueDecoding = true;
531                break;
532            default:
533                SL_LOGE("MediaSource::read returned error %d", err);
534                break;
535        }
536        if (continueDecoding) {
537            if (NULL == mDecodeBuffer) {
538                (new AMessage(kWhatDecode, id()))->post();
539                return;
540            }
541        } else {
542            return;
543        }
544    }
545
546    //-------------------------------- Render
547    sp<AMessage> msg = new AMessage(kWhatRender, id());
548    msg->post();
549}
550
551
552void AudioSfDecoder::onRender() {
553    //SL_LOGV("AudioSfDecoder::onRender");
554
555    Mutex::Autolock _l(mBufferSourceLock);
556
557    if (NULL == mDecodeBuffer) {
558        // nothing to render, move along
559        SL_LOGV("AudioSfDecoder::onRender NULL buffer, exiting");
560        return;
561    }
562
563    mDecodeBuffer->release();
564    mDecodeBuffer = NULL;
565
566}
567
568
569void AudioSfDecoder::onMessageReceived(const sp<AMessage> &msg) {
570    switch (msg->what()) {
571        case kWhatPrepare:
572            onPrepare();
573            break;
574
575        case kWhatDecode:
576            onDecode();
577            break;
578
579        case kWhatRender:
580            onRender();
581            break;
582
583        case kWhatCheckCache:
584            onCheckCache(msg);
585            break;
586
587        case kWhatNotif:
588            onNotify(msg);
589            break;
590
591        case kWhatPlay:
592            onPlay();
593            break;
594
595        case kWhatPause:
596            onPause();
597            break;
598
599        case kWhatGetPcmFormat:
600            onGetPcmFormatKeyCount();
601            break;
602/*
603        case kWhatSeek:
604            onSeek(msg);
605            break;
606
607        case kWhatLoop:
608            onLoop(msg);
609            break;
610*/
611        default:
612            GenericPlayer::onMessageReceived(msg);
613            break;
614    }
615}
616
617//--------------------------------------------------
618// Prepared state, prefetch status notifications
619void AudioSfDecoder::notifyPrepared(status_t prepareRes) {
620    notify(PLAYEREVENT_PREPARED, (int32_t)prepareRes, true);
621
622}
623
624
625void AudioSfDecoder::onNotify(const sp<AMessage> &msg) {
626    notif_cbf_t notifyClient;
627    void*       notifyUser;
628    {
629        android::Mutex::Autolock autoLock(mNotifyClientLock);
630        if (NULL == mNotifyClient) {
631            return;
632        } else {
633            notifyClient = mNotifyClient;
634            notifyUser   = mNotifyUser;
635        }
636    }
637    int32_t val;
638    if (msg->findInt32(PLAYEREVENT_PREFETCHSTATUSCHANGE, &val)) {
639        SL_LOGV("\tASfPlayer notifying %s = %d", PLAYEREVENT_PREFETCHSTATUSCHANGE, val);
640        notifyClient(kEventPrefetchStatusChange, val, 0, notifyUser);
641    }
642    else if (msg->findInt32(PLAYEREVENT_PREFETCHFILLLEVELUPDATE, &val)) {
643        SL_LOGV("\tASfPlayer notifying %s = %d", PLAYEREVENT_PREFETCHFILLLEVELUPDATE, val);
644        notifyClient(kEventPrefetchFillLevelUpdate, val, 0, notifyUser);
645    }
646    else if (msg->findInt32(PLAYEREVENT_ENDOFSTREAM, &val)) {
647        SL_LOGV("\tASfPlayer notifying %s = %d", PLAYEREVENT_ENDOFSTREAM, val);
648        notifyClient(kEventEndOfStream, val, 0, notifyUser);
649    }
650    else {
651        GenericPlayer::onNotify(msg);
652    }
653}
654
655
656//--------------------------------------------------
657// Private utility functions
658
659bool AudioSfDecoder::wantPrefetch() {
660    if (mDataSource != 0) {
661        return (mDataSource->flags() & DataSource::kWantsPrefetching);
662    } else {
663        // happens if an improper data locator was passed, if the media extractor couldn't be
664        //  initialized, if there is no audio track in the media, if the OMX decoder couldn't be
665        //  instantiated, if the source couldn't be opened, or if the MediaSource
666        //  couldn't be started
667        SL_LOGV("AudioSfDecoder::wantPrefetch() tries to access NULL mDataSource");
668        return false;
669    }
670}
671
672
673int64_t AudioSfDecoder::getPositionUsec() {
674    Mutex::Autolock _l(mSeekLock);
675    if (mStateFlags & kFlagSeeking) {
676        return mSeekTimeMsec * 1000;
677    } else {
678        if (mLastDecodedPositionUs < 0) {
679            return 0;
680        } else {
681            return mLastDecodedPositionUs;
682        }
683    }
684}
685
686
687CacheStatus_t AudioSfDecoder::getCacheRemaining(bool *eos) {
688    sp<NuCachedSource2> cachedSource =
689        static_cast<NuCachedSource2 *>(mDataSource.get());
690
691    CacheStatus_t oldStatus = mCacheStatus;
692
693    status_t finalStatus;
694    size_t dataRemaining = cachedSource->approxDataRemaining(&finalStatus);
695    *eos = (finalStatus != OK);
696
697    CHECK_GE(mBitrate, 0);
698
699    int64_t dataRemainingUs = dataRemaining * 8000000ll / mBitrate;
700    //SL_LOGV("AudioSfDecoder::getCacheRemaining: approx %.2f secs remaining (eos=%d)",
701    //       dataRemainingUs / 1E6, *eos);
702
703    if (*eos) {
704        // data is buffered up to the end of the stream, it can't get any better than this
705        mCacheStatus = kStatusHigh;
706        mCacheFill = 1000;
707
708    } else {
709        if (mDurationUsec > 0) {
710            // known duration:
711
712            //   fill level is ratio of how much has been played + how much is
713            //   cached, divided by total duration
714            uint32_t currentPositionUsec = getPositionUsec();
715            mCacheFill = (int16_t) ((1000.0
716                    * (double)(currentPositionUsec + dataRemainingUs) / mDurationUsec));
717            //SL_LOGV("cacheFill = %d", mCacheFill);
718
719            //   cache status is evaluated against duration thresholds
720            if (dataRemainingUs > DURATION_CACHED_HIGH_MS*1000) {
721                mCacheStatus = kStatusHigh;
722                //LOGV("high");
723            } else if (dataRemainingUs > DURATION_CACHED_MED_MS*1000) {
724                //LOGV("enough");
725                mCacheStatus = kStatusEnough;
726            } else if (dataRemainingUs < DURATION_CACHED_LOW_MS*1000) {
727                //LOGV("low");
728                mCacheStatus = kStatusLow;
729            } else {
730                mCacheStatus = kStatusIntermediate;
731            }
732
733        } else {
734            // unknown duration:
735
736            //   cache status is evaluated against cache amount thresholds
737            //   (no duration so we don't have the bitrate either, could be derived from format?)
738            if (dataRemaining > SIZE_CACHED_HIGH_BYTES) {
739                mCacheStatus = kStatusHigh;
740            } else if (dataRemaining > SIZE_CACHED_MED_BYTES) {
741                mCacheStatus = kStatusEnough;
742            } else if (dataRemaining < SIZE_CACHED_LOW_BYTES) {
743                mCacheStatus = kStatusLow;
744            } else {
745                mCacheStatus = kStatusIntermediate;
746            }
747        }
748
749    }
750
751    if (oldStatus != mCacheStatus) {
752        notifyStatus();
753    }
754
755    if (abs(mCacheFill - mLastNotifiedCacheFill) > mCacheFillNotifThreshold) {
756        notifyCacheFill();
757    }
758
759    return mCacheStatus;
760}
761
762} // namespace android
763