mediaplayer.cpp revision a7e0e8b4c429fc68eb1bd5b5a30f5b91352288f9 
1/* mediaplayer.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18//#define LOG_NDEBUG 0
19#define LOG_TAG "MediaPlayer"
20#include <utils/Log.h>
21
22#include <sys/types.h>
23#include <sys/stat.h>
24#include <unistd.h>
25#include <fcntl.h>
26
27#include <binder/IServiceManager.h>
28#include <binder/IPCThreadState.h>
29
30#include <media/mediaplayer.h>
31#include <media/AudioTrack.h>
32
33#include <binder/MemoryBase.h>
34
35namespace android {
36
37// client singleton for binder interface to service
38Mutex MediaPlayer::sServiceLock;
39sp<IMediaPlayerService> MediaPlayer::sMediaPlayerService;
40sp<MediaPlayer::DeathNotifier> MediaPlayer::sDeathNotifier;
41SortedVector< wp<MediaPlayer> > MediaPlayer::sObitRecipients;
42
43// establish binder interface to service
44const sp<IMediaPlayerService>& MediaPlayer::getMediaPlayerService()
45{
46    Mutex::Autolock _l(sServiceLock);
47    if (sMediaPlayerService.get() == 0) {
48        sp<IServiceManager> sm = defaultServiceManager();
49        sp<IBinder> binder;
50        do {
51            binder = sm->getService(String16("media.player"));
52            if (binder != 0)
53                break;
54            LOGW("MediaPlayerService not published, waiting...");
55            usleep(500000); // 0.5 s
56        } while(true);
57        if (sDeathNotifier == NULL) {
58            sDeathNotifier = new DeathNotifier();
59        }
60        binder->linkToDeath(sDeathNotifier);
61        sMediaPlayerService = interface_cast<IMediaPlayerService>(binder);
62    }
63    LOGE_IF(sMediaPlayerService==0, "no MediaPlayerService!?");
64    return sMediaPlayerService;
65}
66
67void MediaPlayer::addObitRecipient(const wp<MediaPlayer>& recipient)
68{
69    Mutex::Autolock _l(sServiceLock);
70    sObitRecipients.add(recipient);
71}
72
73void MediaPlayer::removeObitRecipient(const wp<MediaPlayer>& recipient)
74{
75    Mutex::Autolock _l(sServiceLock);
76    sObitRecipients.remove(recipient);
77}
78
79MediaPlayer::MediaPlayer()
80{
81    LOGV("constructor");
82    mListener = NULL;
83    mCookie = NULL;
84    mDuration = -1;
85    mStreamType = AudioSystem::MUSIC;
86    mCurrentPosition = -1;
87    mSeekPosition = -1;
88    mCurrentState = MEDIA_PLAYER_IDLE;
89    mPrepareSync = false;
90    mPrepareStatus = NO_ERROR;
91    mLoop = false;
92    mLeftVolume = mRightVolume = 1.0;
93    mVideoWidth = mVideoHeight = 0;
94    mLockThreadId = 0;
95}
96
97void MediaPlayer::onFirstRef()
98{
99    addObitRecipient(this);
100}
101
102MediaPlayer::~MediaPlayer()
103{
104    LOGV("destructor");
105    removeObitRecipient(this);
106    disconnect();
107    IPCThreadState::self()->flushCommands();
108}
109
110void MediaPlayer::disconnect()
111{
112    LOGV("disconnect");
113    sp<IMediaPlayer> p;
114    {
115        Mutex::Autolock _l(mLock);
116        p = mPlayer;
117        mPlayer.clear();
118    }
119
120    if (p != 0) {
121        p->disconnect();
122    }
123}
124
125// always call with lock held
126void MediaPlayer::clear_l()
127{
128    mDuration = -1;
129    mCurrentPosition = -1;
130    mSeekPosition = -1;
131    mVideoWidth = mVideoHeight = 0;
132}
133
134status_t MediaPlayer::setListener(const sp<MediaPlayerListener>& listener)
135{
136    LOGV("setListener");
137    Mutex::Autolock _l(mLock);
138    mListener = listener;
139    return NO_ERROR;
140}
141
142
143status_t MediaPlayer::setDataSource(const sp<IMediaPlayer>& player)
144{
145    status_t err = UNKNOWN_ERROR;
146    sp<IMediaPlayer> p;
147    { // scope for the lock
148        Mutex::Autolock _l(mLock);
149
150        if ( !( mCurrentState & ( MEDIA_PLAYER_IDLE | MEDIA_PLAYER_STATE_ERROR ) ) ) {
151            LOGE("setDataSource called in state %d", mCurrentState);
152            return INVALID_OPERATION;
153        }
154
155        clear_l();
156        p = mPlayer;
157        mPlayer = player;
158        if (player != 0) {
159            mCurrentState = MEDIA_PLAYER_INITIALIZED;
160            err = NO_ERROR;
161        } else {
162            LOGE("Unable to to create media player");
163        }
164    }
165
166    if (p != 0) {
167        p->disconnect();
168    }
169
170    return err;
171}
172
173status_t MediaPlayer::setDataSource(const char *url)
174{
175    LOGV("setDataSource(%s)", url);
176    status_t err = BAD_VALUE;
177    if (url != NULL) {
178        const sp<IMediaPlayerService>& service(getMediaPlayerService());
179        if (service != 0) {
180            sp<IMediaPlayer> player(service->create(getpid(), this, url));
181            err = setDataSource(player);
182        }
183    }
184    return err;
185}
186
187status_t MediaPlayer::setDataSource(int fd, int64_t offset, int64_t length)
188{
189    LOGV("setDataSource(%d, %lld, %lld)", fd, offset, length);
190    status_t err = UNKNOWN_ERROR;
191    const sp<IMediaPlayerService>& service(getMediaPlayerService());
192    if (service != 0) {
193        sp<IMediaPlayer> player(service->create(getpid(), this, fd, offset, length));
194        err = setDataSource(player);
195    }
196    return err;
197}
198
199status_t MediaPlayer::invoke(const Parcel& request, Parcel *reply)
200{
201    Mutex::Autolock _l(mLock);
202    if ((mPlayer != NULL) && ( mCurrentState & MEDIA_PLAYER_INITIALIZED ))
203    {
204         LOGV("invoke %d", request.dataSize());
205         return  mPlayer->invoke(request, reply);
206    }
207    LOGE("invoke failed: wrong state %X", mCurrentState);
208    return INVALID_OPERATION;
209}
210
211status_t MediaPlayer::setMetadataFilter(const Parcel& filter)
212{
213    LOGD("setMetadataFilter");
214    Mutex::Autolock _l(mLock);
215    if (mPlayer == NULL)
216    {
217        return NO_INIT;
218    }
219    return mPlayer->setMetadataFilter(filter);
220}
221
222status_t MediaPlayer::setVideoSurface(const sp<Surface>& surface)
223{
224    LOGV("setVideoSurface");
225    Mutex::Autolock _l(mLock);
226    if (mPlayer == 0) return NO_INIT;
227    return  mPlayer->setVideoSurface(surface->getISurface());
228}
229
230// must call with lock held
231status_t MediaPlayer::prepareAsync_l()
232{
233    if ( (mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_INITIALIZED | MEDIA_PLAYER_STOPPED) ) ) {
234        mPlayer->setAudioStreamType(mStreamType);
235        mCurrentState = MEDIA_PLAYER_PREPARING;
236        return mPlayer->prepareAsync();
237    }
238    LOGE("prepareAsync called in state %d", mCurrentState);
239    return INVALID_OPERATION;
240}
241
242// TODO: In case of error, prepareAsync provides the caller with 2 error codes,
243// one defined in the Android framework and one provided by the implementation
244// that generated the error. The sync version of prepare returns only 1 error
245// code.
246status_t MediaPlayer::prepare()
247{
248    LOGV("prepare");
249    Mutex::Autolock _l(mLock);
250    mLockThreadId = getThreadId();
251    if (mPrepareSync) {
252        mLockThreadId = 0;
253        return -EALREADY;
254    }
255    mPrepareSync = true;
256    status_t ret = prepareAsync_l();
257    if (ret != NO_ERROR) {
258        mLockThreadId = 0;
259        return ret;
260    }
261
262    if (mPrepareSync) {
263        mSignal.wait(mLock);  // wait for prepare done
264        mPrepareSync = false;
265    }
266    LOGV("prepare complete - status=%d", mPrepareStatus);
267    mLockThreadId = 0;
268    return mPrepareStatus;
269}
270
271status_t MediaPlayer::prepareAsync()
272{
273    LOGV("prepareAsync");
274    Mutex::Autolock _l(mLock);
275    return prepareAsync_l();
276}
277
278status_t MediaPlayer::start()
279{
280    LOGV("start");
281    Mutex::Autolock _l(mLock);
282    if (mCurrentState & MEDIA_PLAYER_STARTED)
283        return NO_ERROR;
284    if ( (mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_PREPARED |
285                    MEDIA_PLAYER_PLAYBACK_COMPLETE | MEDIA_PLAYER_PAUSED ) ) ) {
286        mPlayer->setLooping(mLoop);
287        mPlayer->setVolume(mLeftVolume, mRightVolume);
288        mCurrentState = MEDIA_PLAYER_STARTED;
289        status_t ret = mPlayer->start();
290        if (ret != NO_ERROR) {
291            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
292        } else {
293            if (mCurrentState == MEDIA_PLAYER_PLAYBACK_COMPLETE) {
294                LOGV("playback completed immediately following start()");
295            }
296        }
297        return ret;
298    }
299    LOGE("start called in state %d", mCurrentState);
300    return INVALID_OPERATION;
301}
302
303status_t MediaPlayer::stop()
304{
305    LOGV("stop");
306    Mutex::Autolock _l(mLock);
307    if (mCurrentState & MEDIA_PLAYER_STOPPED) return NO_ERROR;
308    if ( (mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_STARTED | MEDIA_PLAYER_PREPARED |
309                    MEDIA_PLAYER_PAUSED | MEDIA_PLAYER_PLAYBACK_COMPLETE ) ) ) {
310        status_t ret = mPlayer->stop();
311        if (ret != NO_ERROR) {
312            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
313        } else {
314            mCurrentState = MEDIA_PLAYER_STOPPED;
315        }
316        return ret;
317    }
318    LOGE("stop called in state %d", mCurrentState);
319    return INVALID_OPERATION;
320}
321
322status_t MediaPlayer::pause()
323{
324    LOGV("pause");
325    Mutex::Autolock _l(mLock);
326    if (mCurrentState & MEDIA_PLAYER_PAUSED)
327        return NO_ERROR;
328    if ((mPlayer != 0) && (mCurrentState & MEDIA_PLAYER_STARTED)) {
329        status_t ret = mPlayer->pause();
330        if (ret != NO_ERROR) {
331            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
332        } else {
333            mCurrentState = MEDIA_PLAYER_PAUSED;
334        }
335        return ret;
336    }
337    LOGE("pause called in state %d", mCurrentState);
338    return INVALID_OPERATION;
339}
340
341bool MediaPlayer::isPlaying()
342{
343    Mutex::Autolock _l(mLock);
344    if (mPlayer != 0) {
345        bool temp = false;
346        mPlayer->isPlaying(&temp);
347        LOGV("isPlaying: %d", temp);
348        if ((mCurrentState & MEDIA_PLAYER_STARTED) && ! temp) {
349            LOGE("internal/external state mismatch corrected");
350            mCurrentState = MEDIA_PLAYER_PAUSED;
351        }
352        return temp;
353    }
354    LOGV("isPlaying: no active player");
355    return false;
356}
357
358status_t MediaPlayer::getVideoWidth(int *w)
359{
360    LOGV("getVideoWidth");
361    Mutex::Autolock _l(mLock);
362    if (mPlayer == 0) return INVALID_OPERATION;
363    *w = mVideoWidth;
364    return NO_ERROR;
365}
366
367status_t MediaPlayer::getVideoHeight(int *h)
368{
369    LOGV("getVideoHeight");
370    Mutex::Autolock _l(mLock);
371    if (mPlayer == 0) return INVALID_OPERATION;
372    *h = mVideoHeight;
373    return NO_ERROR;
374}
375
376status_t MediaPlayer::getCurrentPosition(int *msec)
377{
378    LOGV("getCurrentPosition");
379    Mutex::Autolock _l(mLock);
380    if (mPlayer != 0) {
381        if (mCurrentPosition >= 0) {
382            LOGV("Using cached seek position: %d", mCurrentPosition);
383            *msec = mCurrentPosition;
384            return NO_ERROR;
385        }
386        return mPlayer->getCurrentPosition(msec);
387    }
388    return INVALID_OPERATION;
389}
390
391status_t MediaPlayer::getDuration_l(int *msec)
392{
393    LOGV("getDuration");
394    bool isValidState = (mCurrentState & (MEDIA_PLAYER_PREPARED | MEDIA_PLAYER_STARTED | MEDIA_PLAYER_PAUSED | MEDIA_PLAYER_STOPPED | MEDIA_PLAYER_PLAYBACK_COMPLETE));
395    if (mPlayer != 0 && isValidState) {
396        status_t ret = NO_ERROR;
397        if (mDuration <= 0)
398            ret = mPlayer->getDuration(&mDuration);
399        if (msec)
400            *msec = mDuration;
401        return ret;
402    }
403    LOGE("Attempt to call getDuration without a valid mediaplayer");
404    return INVALID_OPERATION;
405}
406
407status_t MediaPlayer::getDuration(int *msec)
408{
409    Mutex::Autolock _l(mLock);
410    return getDuration_l(msec);
411}
412
413status_t MediaPlayer::seekTo_l(int msec)
414{
415    LOGV("seekTo %d", msec);
416    if ((mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_STARTED | MEDIA_PLAYER_PREPARED | MEDIA_PLAYER_PAUSED |  MEDIA_PLAYER_PLAYBACK_COMPLETE) ) ) {
417        if ( msec < 0 ) {
418            LOGW("Attempt to seek to invalid position: %d", msec);
419            msec = 0;
420        } else if ((mDuration > 0) && (msec > mDuration)) {
421            LOGW("Attempt to seek to past end of file: request = %d, EOF = %d", msec, mDuration);
422            msec = mDuration;
423        }
424        // cache duration
425        mCurrentPosition = msec;
426        if (mSeekPosition < 0) {
427            getDuration_l(NULL);
428            mSeekPosition = msec;
429            return mPlayer->seekTo(msec);
430        }
431        else {
432            LOGV("Seek in progress - queue up seekTo[%d]", msec);
433            return NO_ERROR;
434        }
435    }
436    LOGE("Attempt to perform seekTo in wrong state: mPlayer=%p, mCurrentState=%u", mPlayer.get(), mCurrentState);
437    return INVALID_OPERATION;
438}
439
440status_t MediaPlayer::seekTo(int msec)
441{
442    mLockThreadId = getThreadId();
443    Mutex::Autolock _l(mLock);
444    status_t result = seekTo_l(msec);
445    mLockThreadId = 0;
446
447    return result;
448}
449
450status_t MediaPlayer::reset()
451{
452    LOGV("reset");
453    Mutex::Autolock _l(mLock);
454    mLoop = false;
455    if (mCurrentState == MEDIA_PLAYER_IDLE) return NO_ERROR;
456    mPrepareSync = false;
457    if (mPlayer != 0) {
458        status_t ret = mPlayer->reset();
459        if (ret != NO_ERROR) {
460            LOGE("reset() failed with return code (%d)", ret);
461            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
462        } else {
463            mCurrentState = MEDIA_PLAYER_IDLE;
464        }
465        return ret;
466    }
467    clear_l();
468    return NO_ERROR;
469}
470
471status_t MediaPlayer::setAudioStreamType(int type)
472{
473    LOGV("MediaPlayer::setAudioStreamType");
474    Mutex::Autolock _l(mLock);
475    if (mStreamType == type) return NO_ERROR;
476    if (mCurrentState & ( MEDIA_PLAYER_PREPARED | MEDIA_PLAYER_STARTED |
477                MEDIA_PLAYER_PAUSED | MEDIA_PLAYER_PLAYBACK_COMPLETE ) ) {
478        // Can't change the stream type after prepare
479        LOGE("setAudioStream called in state %d", mCurrentState);
480        return INVALID_OPERATION;
481    }
482    // cache
483    mStreamType = type;
484    return OK;
485}
486
487status_t MediaPlayer::setLooping(int loop)
488{
489    LOGV("MediaPlayer::setLooping");
490    Mutex::Autolock _l(mLock);
491    mLoop = (loop != 0);
492    if (mPlayer != 0) {
493        return mPlayer->setLooping(loop);
494    }
495    return OK;
496}
497
498bool MediaPlayer::isLooping() {
499    LOGV("isLooping");
500    Mutex::Autolock _l(mLock);
501    if (mPlayer != 0) {
502        return mLoop;
503    }
504    LOGV("isLooping: no active player");
505    return false;
506}
507
508status_t MediaPlayer::setVolume(float leftVolume, float rightVolume)
509{
510    LOGV("MediaPlayer::setVolume(%f, %f)", leftVolume, rightVolume);
511    Mutex::Autolock _l(mLock);
512    mLeftVolume = leftVolume;
513    mRightVolume = rightVolume;
514    if (mPlayer != 0) {
515        return mPlayer->setVolume(leftVolume, rightVolume);
516    }
517    return OK;
518}
519
520void MediaPlayer::notify(int msg, int ext1, int ext2)
521{
522    LOGV("message received msg=%d, ext1=%d, ext2=%d", msg, ext1, ext2);
523    bool send = true;
524    bool locked = false;
525
526    // TODO: In the future, we might be on the same thread if the app is
527    // running in the same process as the media server. In that case,
528    // this will deadlock.
529    //
530    // The threadId hack below works around this for the care of prepare
531    // and seekTo within the same process.
532    // FIXME: Remember, this is a hack, it's not even a hack that is applied
533    // consistently for all use-cases, this needs to be revisited.
534     if (mLockThreadId != getThreadId()) {
535        mLock.lock();
536        locked = true;
537    }
538
539    if (mPlayer == 0) {
540        LOGV("notify(%d, %d, %d) callback on disconnected mediaplayer", msg, ext1, ext2);
541        if (locked) mLock.unlock();   // release the lock when done.
542        return;
543    }
544
545    switch (msg) {
546    case MEDIA_NOP: // interface test message
547        break;
548    case MEDIA_PREPARED:
549        LOGV("prepared");
550        mCurrentState = MEDIA_PLAYER_PREPARED;
551        if (mPrepareSync) {
552            LOGV("signal application thread");
553            mPrepareSync = false;
554            mPrepareStatus = NO_ERROR;
555            mSignal.signal();
556        }
557        break;
558    case MEDIA_PLAYBACK_COMPLETE:
559        LOGV("playback complete");
560        if (!mLoop) {
561            mCurrentState = MEDIA_PLAYER_PLAYBACK_COMPLETE;
562        }
563        break;
564    case MEDIA_ERROR:
565        // Always log errors.
566        // ext1: Media framework error code.
567        // ext2: Implementation dependant error code.
568        LOGE("error (%d, %d)", ext1, ext2);
569        mCurrentState = MEDIA_PLAYER_STATE_ERROR;
570        if (mPrepareSync)
571        {
572            LOGV("signal application thread");
573            mPrepareSync = false;
574            mPrepareStatus = ext1;
575            mSignal.signal();
576            send = false;
577        }
578        break;
579    case MEDIA_INFO:
580        // ext1: Media framework error code.
581        // ext2: Implementation dependant error code.
582        LOGW("info/warning (%d, %d)", ext1, ext2);
583        break;
584    case MEDIA_SEEK_COMPLETE:
585        LOGV("Received seek complete");
586        if (mSeekPosition != mCurrentPosition) {
587            LOGV("Executing queued seekTo(%d)", mSeekPosition);
588            mSeekPosition = -1;
589            seekTo_l(mCurrentPosition);
590        }
591        else {
592            LOGV("All seeks complete - return to regularly scheduled program");
593            mCurrentPosition = mSeekPosition = -1;
594        }
595        break;
596    case MEDIA_BUFFERING_UPDATE:
597        LOGV("buffering %d", ext1);
598        break;
599    case MEDIA_SET_VIDEO_SIZE:
600        LOGV("New video size %d x %d", ext1, ext2);
601        mVideoWidth = ext1;
602        mVideoHeight = ext2;
603        break;
604    default:
605        LOGV("unrecognized message: (%d, %d, %d)", msg, ext1, ext2);
606        break;
607    }
608
609    sp<MediaPlayerListener> listener = mListener;
610    if (locked) mLock.unlock();
611
612    // this prevents re-entrant calls into client code
613    if ((listener != 0) && send) {
614        Mutex::Autolock _l(mNotifyLock);
615        LOGV("callback application");
616        listener->notify(msg, ext1, ext2);
617        LOGV("back from callback");
618    }
619}
620
621void MediaPlayer::DeathNotifier::binderDied(const wp<IBinder>& who) {
622    LOGW("MediaPlayer server died!");
623
624    // Need to do this with the lock held
625    SortedVector< wp<MediaPlayer> > list;
626    {
627        Mutex::Autolock _l(MediaPlayer::sServiceLock);
628        MediaPlayer::sMediaPlayerService.clear();
629        list = sObitRecipients;
630    }
631
632    // Notify application when media server dies.
633    // Don't hold the static lock during callback in case app
634    // makes a call that needs the lock.
635    size_t count = list.size();
636    for (size_t iter = 0; iter < count; ++iter) {
637        sp<MediaPlayer> player = list[iter].promote();
638        if ((player != 0) && (player->mPlayer != 0)) {
639            player->notify(MEDIA_ERROR, MEDIA_ERROR_SERVER_DIED, 0);
640        }
641    }
642}
643
644MediaPlayer::DeathNotifier::~DeathNotifier()
645{
646    Mutex::Autolock _l(sServiceLock);
647    sObitRecipients.clear();
648    if (sMediaPlayerService != 0) {
649        sMediaPlayerService->asBinder()->unlinkToDeath(this);
650    }
651}
652
653/*static*/ sp<IMemory> MediaPlayer::decode(const char* url, uint32_t *pSampleRate, int* pNumChannels, int* pFormat)
654{
655    LOGV("decode(%s)", url);
656    sp<IMemory> p;
657    const sp<IMediaPlayerService>& service = getMediaPlayerService();
658    if (service != 0) {
659        p = sMediaPlayerService->decode(url, pSampleRate, pNumChannels, pFormat);
660    } else {
661        LOGE("Unable to locate media service");
662    }
663    return p;
664
665}
666
667/*static*/ sp<IMemory> MediaPlayer::decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels, int* pFormat)
668{
669    LOGV("decode(%d, %lld, %lld)", fd, offset, length);
670    sp<IMemory> p;
671    const sp<IMediaPlayerService>& service = getMediaPlayerService();
672    if (service != 0) {
673        p = sMediaPlayerService->decode(fd, offset, length, pSampleRate, pNumChannels, pFormat);
674    } else {
675        LOGE("Unable to locate media service");
676    }
677    return p;
678
679}
680
681}; // namespace android
682