mediaplayer.cpp revision 7b5eb023f8d87cca6d830ae6c11c6aadbe02aca8 
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 <utils/IServiceManager.h>
28#include <utils/IPCThreadState.h>
29
30#include <media/mediaplayer.h>
31#include <media/AudioTrack.h>
32
33#include <utils/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 = AudioTrack::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}
95
96void MediaPlayer::onFirstRef()
97{
98    addObitRecipient(this);
99}
100
101MediaPlayer::~MediaPlayer()
102{
103    LOGV("destructor");
104    removeObitRecipient(this);
105    disconnect();
106    IPCThreadState::self()->flushCommands();
107}
108
109void MediaPlayer::disconnect()
110{
111    LOGV("disconnect");
112    sp<IMediaPlayer> p;
113    {
114        Mutex::Autolock _l(mLock);
115        p = mPlayer;
116        mPlayer.clear();
117    }
118
119    if (p != 0) {
120        p->disconnect();
121    }
122}
123
124// always call with lock held
125void MediaPlayer::clear_l()
126{
127    mDuration = -1;
128    mCurrentPosition = -1;
129    mSeekPosition = -1;
130    mVideoWidth = mVideoHeight = 0;
131}
132
133status_t MediaPlayer::setListener(const sp<MediaPlayerListener>& listener)
134{
135    LOGV("setListener");
136    Mutex::Autolock _l(mLock);
137    mListener = listener;
138    return NO_ERROR;
139}
140
141
142status_t MediaPlayer::setDataSource(const sp<IMediaPlayer>& player)
143{
144    status_t err = UNKNOWN_ERROR;
145    sp<IMediaPlayer> p;
146    { // scope for the lock
147        Mutex::Autolock _l(mLock);
148
149        if ( !( mCurrentState & ( MEDIA_PLAYER_IDLE | MEDIA_PLAYER_STATE_ERROR ) ) ) {
150            LOGE("setDataSource called in state %d", mCurrentState);
151            return INVALID_OPERATION;
152        }
153
154        clear_l();
155        p = mPlayer;
156        mPlayer = player;
157        if (player != 0) {
158            mCurrentState = MEDIA_PLAYER_INITIALIZED;
159            err = NO_ERROR;
160        } else {
161            LOGE("Unable to to create media player");
162        }
163    }
164
165    if (p != 0) {
166        p->disconnect();
167    }
168
169    return err;
170}
171
172status_t MediaPlayer::setDataSource(const char *url)
173{
174    LOGV("setDataSource(%s)", url);
175    status_t err = UNKNOWN_ERROR;
176    if (url != NULL) {
177        const sp<IMediaPlayerService>& service(getMediaPlayerService());
178        if (service != 0) {
179            sp<IMediaPlayer> player(service->create(getpid(), this, url));
180            err = setDataSource(player);
181        }
182    }
183    return err;
184}
185
186status_t MediaPlayer::setDataSource(int fd, int64_t offset, int64_t length)
187{
188    LOGV("setDataSource(%d, %lld, %lld)", fd, offset, length);
189    status_t err = UNKNOWN_ERROR;
190    const sp<IMediaPlayerService>& service(getMediaPlayerService());
191    if (service != 0) {
192        sp<IMediaPlayer> player(service->create(getpid(), this, fd, offset, length));
193        err = setDataSource(player);
194    }
195    return err;
196}
197
198status_t MediaPlayer::setVideoSurface(const sp<Surface>& surface)
199{
200    LOGV("setVideoSurface");
201    Mutex::Autolock _l(mLock);
202    if (mPlayer == 0) return UNKNOWN_ERROR;
203    return  mPlayer->setVideoSurface(surface->getISurface());
204}
205
206// must call with lock held
207status_t MediaPlayer::prepareAsync_l()
208{
209    if ( (mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_INITIALIZED | MEDIA_PLAYER_STOPPED) ) ) {
210        mPlayer->setAudioStreamType(mStreamType);
211        mCurrentState = MEDIA_PLAYER_PREPARING;
212        return mPlayer->prepareAsync();
213    }
214    LOGE("prepareAsync called in state %d", mCurrentState);
215    return INVALID_OPERATION;
216}
217
218status_t MediaPlayer::prepare()
219{
220    LOGV("prepare");
221    Mutex::Autolock _l(mLock);
222    if (mPrepareSync) return UNKNOWN_ERROR;
223    mPrepareSync = true;
224    status_t ret = prepareAsync_l();
225    if (ret != NO_ERROR) return ret;
226
227    if (mPrepareSync) {
228        mSignal.wait(mLock);  // wait for prepare done
229        mPrepareSync = false;
230    }
231    LOGV("prepare complete - status=%d", mPrepareStatus);
232    return mPrepareStatus;
233}
234
235status_t MediaPlayer::prepareAsync()
236{
237    LOGV("prepareAsync");
238    Mutex::Autolock _l(mLock);
239    return prepareAsync_l();
240}
241
242status_t MediaPlayer::start()
243{
244    LOGV("start");
245    Mutex::Autolock _l(mLock);
246    if (mCurrentState & MEDIA_PLAYER_STARTED)
247        return NO_ERROR;
248    if ( (mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_PREPARED |
249                    MEDIA_PLAYER_PLAYBACK_COMPLETE | MEDIA_PLAYER_PAUSED ) ) ) {
250        mPlayer->setLooping(mLoop);
251        mPlayer->setVolume(mLeftVolume, mRightVolume);
252        mCurrentState = MEDIA_PLAYER_STARTED;
253        status_t ret = mPlayer->start();
254        if (ret != NO_ERROR) {
255            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
256            ret = UNKNOWN_ERROR;
257        } else {
258            if (mCurrentState == MEDIA_PLAYER_PLAYBACK_COMPLETE) {
259                LOGV("playback completed immediately following start()");
260            }
261        }
262        return ret;
263    }
264    LOGE("start called in state %d", mCurrentState);
265    return INVALID_OPERATION;
266}
267
268status_t MediaPlayer::stop()
269{
270    LOGV("stop");
271    Mutex::Autolock _l(mLock);
272    if (mCurrentState & MEDIA_PLAYER_STOPPED) return NO_ERROR;
273    if ( (mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_STARTED | MEDIA_PLAYER_PREPARED |
274                    MEDIA_PLAYER_PAUSED | MEDIA_PLAYER_PLAYBACK_COMPLETE ) ) ) {
275        status_t ret = mPlayer->stop();
276        if (ret != NO_ERROR) {
277            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
278            ret = UNKNOWN_ERROR;
279        } else {
280            mCurrentState = MEDIA_PLAYER_STOPPED;
281        }
282        return ret;
283    }
284    LOGE("stop called in state %d", mCurrentState);
285    return INVALID_OPERATION;
286}
287
288status_t MediaPlayer::pause()
289{
290    LOGV("pause");
291    Mutex::Autolock _l(mLock);
292    if (mCurrentState & MEDIA_PLAYER_PAUSED)
293        return NO_ERROR;
294    if ((mPlayer != 0) && (mCurrentState & MEDIA_PLAYER_STARTED)) {
295        status_t ret = mPlayer->pause();
296        if (ret != NO_ERROR) {
297            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
298            ret = UNKNOWN_ERROR;
299        } else {
300            mCurrentState = MEDIA_PLAYER_PAUSED;
301        }
302        return ret;
303    }
304    LOGE("pause called in state %d", mCurrentState);
305    return INVALID_OPERATION;
306}
307
308bool MediaPlayer::isPlaying()
309{
310    Mutex::Autolock _l(mLock);
311    if (mPlayer != 0) {
312        bool temp = false;
313        mPlayer->isPlaying(&temp);
314        LOGV("isPlaying: %d", temp);
315        if ((mCurrentState & MEDIA_PLAYER_STARTED) && ! temp) {
316            LOGE("internal/external state mismatch corrected");
317            mCurrentState = MEDIA_PLAYER_PAUSED;
318        }
319        return temp;
320    }
321    LOGV("isPlaying: no active player");
322    return false;
323}
324
325status_t MediaPlayer::getVideoWidth(int *w)
326{
327    LOGV("getVideoWidth");
328    Mutex::Autolock _l(mLock);
329    if (mPlayer == 0) return INVALID_OPERATION;
330    *w = mVideoWidth;
331    return NO_ERROR;
332}
333
334status_t MediaPlayer::getVideoHeight(int *h)
335{
336    LOGV("getVideoHeight");
337    Mutex::Autolock _l(mLock);
338    if (mPlayer == 0) return INVALID_OPERATION;
339    *h = mVideoHeight;
340    return NO_ERROR;
341}
342
343status_t MediaPlayer::getCurrentPosition(int *msec)
344{
345    LOGV("getCurrentPosition");
346    Mutex::Autolock _l(mLock);
347    if (mPlayer != 0) {
348        if (mCurrentPosition >= 0) {
349            LOGV("Using cached seek position: %d", mCurrentPosition);
350            *msec = mCurrentPosition;
351            return NO_ERROR;
352        }
353        return mPlayer->getCurrentPosition(msec);
354    }
355    return INVALID_OPERATION;
356}
357
358status_t MediaPlayer::getDuration_l(int *msec)
359{
360    LOGV("getDuration");
361    bool isValidState = (mCurrentState & (MEDIA_PLAYER_PREPARED | MEDIA_PLAYER_STARTED | MEDIA_PLAYER_PAUSED | MEDIA_PLAYER_STOPPED | MEDIA_PLAYER_PLAYBACK_COMPLETE));
362    if (mPlayer != 0 && isValidState) {
363        status_t ret = NO_ERROR;
364        if (mDuration <= 0)
365            ret = mPlayer->getDuration(&mDuration);
366        if (msec)
367            *msec = mDuration;
368        return ret;
369    }
370    LOGE("Attempt to call getDuration without a valid mediaplayer");
371    return INVALID_OPERATION;
372}
373
374status_t MediaPlayer::getDuration(int *msec)
375{
376    Mutex::Autolock _l(mLock);
377    return getDuration_l(msec);
378}
379
380status_t MediaPlayer::seekTo_l(int msec)
381{
382    LOGV("seekTo %d", msec);
383    if ((mPlayer != 0) && ( mCurrentState & ( MEDIA_PLAYER_STARTED | MEDIA_PLAYER_PREPARED | MEDIA_PLAYER_PAUSED |  MEDIA_PLAYER_PLAYBACK_COMPLETE) ) ) {
384        if ( msec < 0 ) {
385            LOGW("Attempt to seek to invalid position: %d", msec);
386            msec = 0;
387        } else if ((mDuration > 0) && (msec > mDuration)) {
388            LOGW("Attempt to seek to past end of file: request = %d, EOF = %d", msec, mDuration);
389            msec = mDuration;
390        }
391        // cache duration
392        mCurrentPosition = msec;
393        if (mSeekPosition < 0) {
394            getDuration_l(NULL);
395            mSeekPosition = msec;
396            return mPlayer->seekTo(msec);
397        }
398        else {
399            LOGV("Seek in progress - queue up seekTo[%d]", msec);
400            return NO_ERROR;
401        }
402    }
403    LOGE("Attempt to perform seekTo in wrong state: mPlayer=%p, mCurrentState=%u", mPlayer.get(), mCurrentState);
404    return INVALID_OPERATION;
405}
406
407status_t MediaPlayer::seekTo(int msec)
408{
409    Mutex::Autolock _l(mLock);
410    return seekTo_l(msec);
411}
412
413status_t MediaPlayer::reset()
414{
415    LOGV("reset");
416    Mutex::Autolock _l(mLock);
417    mLoop = false;
418    if (mCurrentState == MEDIA_PLAYER_IDLE) return NO_ERROR;
419    mPrepareSync = false;
420    if (mPlayer != 0) {
421        status_t ret = mPlayer->reset();
422        if (ret != NO_ERROR) {
423            LOGE("reset() failed with return code (%d)", ret);
424            mCurrentState = MEDIA_PLAYER_STATE_ERROR;
425            ret = UNKNOWN_ERROR;
426        } else {
427            mCurrentState = MEDIA_PLAYER_IDLE;
428        }
429        return ret;
430    }
431    clear_l();
432    return NO_ERROR;
433}
434
435status_t MediaPlayer::setAudioStreamType(int type)
436{
437    LOGV("MediaPlayer::setAudioStreamType");
438    Mutex::Autolock _l(mLock);
439    if (mStreamType == type) return NO_ERROR;
440    if (mCurrentState & ( MEDIA_PLAYER_PREPARED | MEDIA_PLAYER_STARTED |
441                MEDIA_PLAYER_PAUSED | MEDIA_PLAYER_PLAYBACK_COMPLETE ) ) {
442        // Can't change the stream type after prepare
443        LOGE("setAudioStream called in state %d", mCurrentState);
444        return INVALID_OPERATION;
445    }
446    // cache
447    mStreamType = type;
448    return OK;
449}
450
451status_t MediaPlayer::setLooping(int loop)
452{
453    LOGV("MediaPlayer::setLooping");
454    Mutex::Autolock _l(mLock);
455    mLoop = (loop != 0);
456    if (mPlayer != 0) {
457        return mPlayer->setLooping(loop);
458    }
459    return OK;
460}
461
462bool MediaPlayer::isLooping() {
463    LOGV("isLooping");
464    Mutex::Autolock _l(mLock);
465    if (mPlayer != 0) {
466        return mLoop;
467    }
468    LOGV("isLooping: no active player");
469    return false;
470}
471
472status_t MediaPlayer::setVolume(float leftVolume, float rightVolume)
473{
474    LOGV("MediaPlayer::setVolume(%f, %f)", leftVolume, rightVolume);
475    Mutex::Autolock _l(mLock);
476    mLeftVolume = leftVolume;
477    mRightVolume = rightVolume;
478    if (mPlayer != 0) {
479        return mPlayer->setVolume(leftVolume, rightVolume);
480    }
481    return OK;
482}
483
484void MediaPlayer::notify(int msg, int ext1, int ext2)
485{
486    LOGV("message received msg=%d, ext1=%d, ext2=%d", msg, ext1, ext2);
487    bool send = true;
488
489    // TODO: In the future, we might be on the same thread if the app is
490    // running in the same process as the media server. In that case,
491    // this will deadlock.
492    mLock.lock();
493    if (mPlayer == 0) {
494        LOGV("notify(%d, %d, %d) callback on disconnected mediaplayer", msg, ext1, ext2);
495        mLock.unlock();   // release the lock when done.
496        return;
497    }
498
499    switch (msg) {
500    case MEDIA_NOP: // interface test message
501        break;
502    case MEDIA_PREPARED:
503        LOGV("prepared");
504        mCurrentState = MEDIA_PLAYER_PREPARED;
505        if (mPrepareSync) {
506            LOGV("signal application thread");
507            mPrepareSync = false;
508            mPrepareStatus = NO_ERROR;
509            mSignal.signal();
510        }
511        break;
512    case MEDIA_PLAYBACK_COMPLETE:
513        LOGV("playback complete");
514        if (!mLoop) {
515            mCurrentState = MEDIA_PLAYER_PLAYBACK_COMPLETE;
516        }
517        break;
518    case MEDIA_ERROR:
519        // Always log errors
520        LOGE("error (%d, %d)", ext1, ext2);
521        mCurrentState = MEDIA_PLAYER_STATE_ERROR;
522        if (mPrepareSync)
523        {
524            LOGV("signal application thread");
525            mPrepareSync = false;
526            mPrepareStatus = ext1;
527            mSignal.signal();
528            send = false;
529        }
530        break;
531    case MEDIA_SEEK_COMPLETE:
532        LOGV("Received seek complete");
533        if (mSeekPosition != mCurrentPosition) {
534            LOGV("Executing queued seekTo(%d)", mSeekPosition);
535            mSeekPosition = -1;
536            seekTo_l(mCurrentPosition);
537        }
538        else {
539            LOGV("All seeks complete - return to regularly scheduled program");
540            mCurrentPosition = mSeekPosition = -1;
541        }
542        break;
543    case MEDIA_BUFFERING_UPDATE:
544        LOGV("buffering %d", ext1);
545        break;
546    case MEDIA_SET_VIDEO_SIZE:
547        LOGV("New video size %d x %d", ext1, ext2);
548        mVideoWidth = ext1;
549        mVideoHeight = ext2;
550        break;
551    default:
552        LOGV("unrecognized message: (%d, %d, %d)", msg, ext1, ext2);
553        break;
554    }
555
556    sp<MediaPlayerListener> listener = mListener;
557    mLock.unlock();
558
559    // this prevents re-entrant calls into client code
560    if ((listener != 0) && send) {
561        Mutex::Autolock _l(mNotifyLock);
562        LOGV("callback application");
563        listener->notify(msg, ext1, ext2);
564        LOGV("back from callback");
565    }
566}
567
568void MediaPlayer::DeathNotifier::binderDied(const wp<IBinder>& who) {
569    LOGW("MediaPlayer server died!");
570
571    // Need to do this with the lock held
572    SortedVector< wp<MediaPlayer> > list;
573    {
574        Mutex::Autolock _l(MediaPlayer::sServiceLock);
575        MediaPlayer::sMediaPlayerService.clear();
576        list = sObitRecipients;
577    }
578
579    // Notify application when media server dies.
580    // Don't hold the static lock during callback in case app
581    // makes a call that needs the lock.
582    size_t count = list.size();
583    for (size_t iter = 0; iter < count; ++iter) {
584        sp<MediaPlayer> player = list[iter].promote();
585        if ((player != 0) && (player->mPlayer != 0)) {
586            player->notify(MEDIA_ERROR, MEDIA_ERROR_SERVER_DIED, 0);
587        }
588    }
589}
590
591MediaPlayer::DeathNotifier::~DeathNotifier()
592{
593    Mutex::Autolock _l(sServiceLock);
594    sObitRecipients.clear();
595    if (sMediaPlayerService != 0) {
596        sMediaPlayerService->asBinder()->unlinkToDeath(this);
597    }
598}
599
600/*static*/ sp<IMemory> MediaPlayer::decode(const char* url, uint32_t *pSampleRate, int* pNumChannels, int* pFormat)
601{
602    LOGV("decode(%s)", url);
603    sp<IMemory> p;
604    const sp<IMediaPlayerService>& service = getMediaPlayerService();
605    if (service != 0) {
606        p = sMediaPlayerService->decode(url, pSampleRate, pNumChannels, pFormat);
607    } else {
608        LOGE("Unable to locate media service");
609    }
610    return p;
611
612}
613
614/*static*/ sp<IMemory> MediaPlayer::decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels, int* pFormat)
615{
616    LOGV("decode(%d, %lld, %lld)", fd, offset, length);
617    sp<IMemory> p;
618    const sp<IMediaPlayerService>& service = getMediaPlayerService();
619    if (service != 0) {
620        p = sMediaPlayerService->decode(fd, offset, length, pSampleRate, pNumChannels, pFormat);
621    } else {
622        LOGE("Unable to locate media service");
623    }
624    return p;
625
626}
627
628}; // namespace android
629