NuPlayerRenderer.cpp revision 2d8bedd05437b6fccdbc6bf70f673ffd86744d59 
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 "NuPlayerRenderer"
19#include <utils/Log.h>
20
21#include "NuPlayerRenderer.h"
22
23#include <media/stagefright/foundation/ABuffer.h>
24#include <media/stagefright/foundation/ADebug.h>
25#include <media/stagefright/foundation/AMessage.h>
26
27namespace android {
28
29// static
30const int64_t NuPlayer::Renderer::kMinPositionUpdateDelayUs = 100000ll;
31
32NuPlayer::Renderer::Renderer(
33        const sp<MediaPlayerBase::AudioSink> &sink,
34        const sp<AMessage> &notify)
35    : mAudioSink(sink),
36      mNotify(notify),
37      mNumFramesWritten(0),
38      mDrainAudioQueuePending(false),
39      mDrainVideoQueuePending(false),
40      mAudioQueueGeneration(0),
41      mVideoQueueGeneration(0),
42      mAnchorTimeMediaUs(-1),
43      mAnchorTimeRealUs(-1),
44      mFlushingAudio(false),
45      mFlushingVideo(false),
46      mHasAudio(false),
47      mHasVideo(false),
48      mSyncQueues(false),
49      mPaused(false),
50      mLastPositionUpdateUs(-1ll),
51      mVideoLateByUs(0ll) {
52}
53
54NuPlayer::Renderer::~Renderer() {
55}
56
57void NuPlayer::Renderer::queueBuffer(
58        bool audio,
59        const sp<ABuffer> &buffer,
60        const sp<AMessage> &notifyConsumed) {
61    sp<AMessage> msg = new AMessage(kWhatQueueBuffer, id());
62    msg->setInt32("audio", static_cast<int32_t>(audio));
63    msg->setBuffer("buffer", buffer);
64    msg->setMessage("notifyConsumed", notifyConsumed);
65    msg->post();
66}
67
68void NuPlayer::Renderer::queueEOS(bool audio, status_t finalResult) {
69    CHECK_NE(finalResult, (status_t)OK);
70
71    sp<AMessage> msg = new AMessage(kWhatQueueEOS, id());
72    msg->setInt32("audio", static_cast<int32_t>(audio));
73    msg->setInt32("finalResult", finalResult);
74    msg->post();
75}
76
77void NuPlayer::Renderer::flush(bool audio) {
78    {
79        Mutex::Autolock autoLock(mFlushLock);
80        if (audio) {
81            CHECK(!mFlushingAudio);
82            mFlushingAudio = true;
83        } else {
84            CHECK(!mFlushingVideo);
85            mFlushingVideo = true;
86        }
87    }
88
89    sp<AMessage> msg = new AMessage(kWhatFlush, id());
90    msg->setInt32("audio", static_cast<int32_t>(audio));
91    msg->post();
92}
93
94void NuPlayer::Renderer::signalTimeDiscontinuity() {
95    CHECK(mAudioQueue.empty());
96    CHECK(mVideoQueue.empty());
97    mAnchorTimeMediaUs = -1;
98    mAnchorTimeRealUs = -1;
99    mSyncQueues = mHasAudio && mHasVideo;
100}
101
102void NuPlayer::Renderer::pause() {
103    (new AMessage(kWhatPause, id()))->post();
104}
105
106void NuPlayer::Renderer::resume() {
107    (new AMessage(kWhatResume, id()))->post();
108}
109
110void NuPlayer::Renderer::onMessageReceived(const sp<AMessage> &msg) {
111    switch (msg->what()) {
112        case kWhatDrainAudioQueue:
113        {
114            int32_t generation;
115            CHECK(msg->findInt32("generation", &generation));
116            if (generation != mAudioQueueGeneration) {
117                break;
118            }
119
120            mDrainAudioQueuePending = false;
121
122            if (onDrainAudioQueue()) {
123                uint32_t numFramesPlayed;
124                CHECK_EQ(mAudioSink->getPosition(&numFramesPlayed),
125                         (status_t)OK);
126
127                uint32_t numFramesPendingPlayout =
128                    mNumFramesWritten - numFramesPlayed;
129
130                // This is how long the audio sink will have data to
131                // play back.
132                int64_t delayUs =
133                    mAudioSink->msecsPerFrame()
134                        * numFramesPendingPlayout * 1000ll;
135
136                // Let's give it more data after about half that time
137                // has elapsed.
138                postDrainAudioQueue(delayUs / 2);
139            }
140            break;
141        }
142
143        case kWhatDrainVideoQueue:
144        {
145            int32_t generation;
146            CHECK(msg->findInt32("generation", &generation));
147            if (generation != mVideoQueueGeneration) {
148                break;
149            }
150
151            mDrainVideoQueuePending = false;
152
153            onDrainVideoQueue();
154
155            postDrainVideoQueue();
156            break;
157        }
158
159        case kWhatQueueBuffer:
160        {
161            onQueueBuffer(msg);
162            break;
163        }
164
165        case kWhatQueueEOS:
166        {
167            onQueueEOS(msg);
168            break;
169        }
170
171        case kWhatFlush:
172        {
173            onFlush(msg);
174            break;
175        }
176
177        case kWhatAudioSinkChanged:
178        {
179            onAudioSinkChanged();
180            break;
181        }
182
183        case kWhatPause:
184        {
185            onPause();
186            break;
187        }
188
189        case kWhatResume:
190        {
191            onResume();
192            break;
193        }
194
195        default:
196            TRESPASS();
197            break;
198    }
199}
200
201void NuPlayer::Renderer::postDrainAudioQueue(int64_t delayUs) {
202    if (mDrainAudioQueuePending || mSyncQueues || mPaused) {
203        return;
204    }
205
206    if (mAudioQueue.empty()) {
207        return;
208    }
209
210    mDrainAudioQueuePending = true;
211    sp<AMessage> msg = new AMessage(kWhatDrainAudioQueue, id());
212    msg->setInt32("generation", mAudioQueueGeneration);
213    msg->post(delayUs);
214}
215
216void NuPlayer::Renderer::signalAudioSinkChanged() {
217    (new AMessage(kWhatAudioSinkChanged, id()))->post();
218}
219
220bool NuPlayer::Renderer::onDrainAudioQueue() {
221    uint32_t numFramesPlayed;
222    if (mAudioSink->getPosition(&numFramesPlayed) != OK) {
223        return false;
224    }
225
226    ssize_t numFramesAvailableToWrite =
227        mAudioSink->frameCount() - (mNumFramesWritten - numFramesPlayed);
228
229#if 0
230    if (numFramesAvailableToWrite == mAudioSink->frameCount()) {
231        ALOGI("audio sink underrun");
232    } else {
233        ALOGV("audio queue has %d frames left to play",
234             mAudioSink->frameCount() - numFramesAvailableToWrite);
235    }
236#endif
237
238    size_t numBytesAvailableToWrite =
239        numFramesAvailableToWrite * mAudioSink->frameSize();
240
241    while (numBytesAvailableToWrite > 0 && !mAudioQueue.empty()) {
242        QueueEntry *entry = &*mAudioQueue.begin();
243
244        if (entry->mBuffer == NULL) {
245            // EOS
246
247            notifyEOS(true /* audio */, entry->mFinalResult);
248
249            mAudioQueue.erase(mAudioQueue.begin());
250            entry = NULL;
251            return false;
252        }
253
254        if (entry->mOffset == 0) {
255            int64_t mediaTimeUs;
256            CHECK(entry->mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));
257
258            ALOGV("rendering audio at media time %.2f secs", mediaTimeUs / 1E6);
259
260            mAnchorTimeMediaUs = mediaTimeUs;
261
262            uint32_t numFramesPlayed;
263            CHECK_EQ(mAudioSink->getPosition(&numFramesPlayed), (status_t)OK);
264
265            uint32_t numFramesPendingPlayout =
266                mNumFramesWritten - numFramesPlayed;
267
268            int64_t realTimeOffsetUs =
269                (mAudioSink->latency() / 2  /* XXX */
270                    + numFramesPendingPlayout
271                        * mAudioSink->msecsPerFrame()) * 1000ll;
272
273            // ALOGI("realTimeOffsetUs = %lld us", realTimeOffsetUs);
274
275            mAnchorTimeRealUs =
276                ALooper::GetNowUs() + realTimeOffsetUs;
277        }
278
279        size_t copy = entry->mBuffer->size() - entry->mOffset;
280        if (copy > numBytesAvailableToWrite) {
281            copy = numBytesAvailableToWrite;
282        }
283
284        CHECK_EQ(mAudioSink->write(
285                    entry->mBuffer->data() + entry->mOffset, copy),
286                 (ssize_t)copy);
287
288        entry->mOffset += copy;
289        if (entry->mOffset == entry->mBuffer->size()) {
290            entry->mNotifyConsumed->post();
291            mAudioQueue.erase(mAudioQueue.begin());
292
293            entry = NULL;
294        }
295
296        numBytesAvailableToWrite -= copy;
297        size_t copiedFrames = copy / mAudioSink->frameSize();
298        mNumFramesWritten += copiedFrames;
299    }
300
301    notifyPosition();
302
303    return !mAudioQueue.empty();
304}
305
306void NuPlayer::Renderer::postDrainVideoQueue() {
307    if (mDrainVideoQueuePending || mSyncQueues || mPaused) {
308        return;
309    }
310
311    if (mVideoQueue.empty()) {
312        return;
313    }
314
315    QueueEntry &entry = *mVideoQueue.begin();
316
317    sp<AMessage> msg = new AMessage(kWhatDrainVideoQueue, id());
318    msg->setInt32("generation", mVideoQueueGeneration);
319
320    int64_t delayUs;
321
322    if (entry.mBuffer == NULL) {
323        // EOS doesn't carry a timestamp.
324        delayUs = 0;
325    } else {
326        int64_t mediaTimeUs;
327        CHECK(entry.mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));
328
329        if (mAnchorTimeMediaUs < 0) {
330            delayUs = 0;
331
332            if (!mHasAudio) {
333                mAnchorTimeMediaUs = mediaTimeUs;
334                mAnchorTimeRealUs = ALooper::GetNowUs();
335            }
336        } else {
337            int64_t realTimeUs =
338                (mediaTimeUs - mAnchorTimeMediaUs) + mAnchorTimeRealUs;
339
340            delayUs = realTimeUs - ALooper::GetNowUs();
341        }
342    }
343
344    msg->post(delayUs);
345
346    mDrainVideoQueuePending = true;
347}
348
349void NuPlayer::Renderer::onDrainVideoQueue() {
350    if (mVideoQueue.empty()) {
351        return;
352    }
353
354    QueueEntry *entry = &*mVideoQueue.begin();
355
356    if (entry->mBuffer == NULL) {
357        // EOS
358
359        notifyEOS(false /* audio */, entry->mFinalResult);
360
361        mVideoQueue.erase(mVideoQueue.begin());
362        entry = NULL;
363
364        mVideoLateByUs = 0ll;
365
366        notifyPosition();
367        return;
368    }
369
370    int64_t mediaTimeUs;
371    CHECK(entry->mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));
372
373    int64_t realTimeUs = mediaTimeUs - mAnchorTimeMediaUs + mAnchorTimeRealUs;
374    mVideoLateByUs = ALooper::GetNowUs() - realTimeUs;
375
376    bool tooLate = (mVideoLateByUs > 40000);
377
378    if (tooLate) {
379        ALOGV("video late by %lld us (%.2f secs)", mVideoLateByUs, mVideoLateByUs / 1E6);
380    } else {
381        ALOGV("rendering video at media time %.2f secs", mediaTimeUs / 1E6);
382    }
383
384    entry->mNotifyConsumed->setInt32("render", !tooLate);
385    entry->mNotifyConsumed->post();
386    mVideoQueue.erase(mVideoQueue.begin());
387    entry = NULL;
388
389    notifyPosition();
390}
391
392void NuPlayer::Renderer::notifyEOS(bool audio, status_t finalResult) {
393    sp<AMessage> notify = mNotify->dup();
394    notify->setInt32("what", kWhatEOS);
395    notify->setInt32("audio", static_cast<int32_t>(audio));
396    notify->setInt32("finalResult", finalResult);
397    notify->post();
398}
399
400void NuPlayer::Renderer::onQueueBuffer(const sp<AMessage> &msg) {
401    int32_t audio;
402    CHECK(msg->findInt32("audio", &audio));
403
404    if (audio) {
405        mHasAudio = true;
406    } else {
407        mHasVideo = true;
408    }
409
410    if (dropBufferWhileFlushing(audio, msg)) {
411        return;
412    }
413
414    sp<ABuffer> buffer;
415    CHECK(msg->findBuffer("buffer", &buffer));
416
417    sp<AMessage> notifyConsumed;
418    CHECK(msg->findMessage("notifyConsumed", &notifyConsumed));
419
420    QueueEntry entry;
421    entry.mBuffer = buffer;
422    entry.mNotifyConsumed = notifyConsumed;
423    entry.mOffset = 0;
424    entry.mFinalResult = OK;
425
426    if (audio) {
427        mAudioQueue.push_back(entry);
428        postDrainAudioQueue();
429    } else {
430        mVideoQueue.push_back(entry);
431        postDrainVideoQueue();
432    }
433
434    if (!mSyncQueues || mAudioQueue.empty() || mVideoQueue.empty()) {
435        return;
436    }
437
438    sp<ABuffer> firstAudioBuffer = (*mAudioQueue.begin()).mBuffer;
439    sp<ABuffer> firstVideoBuffer = (*mVideoQueue.begin()).mBuffer;
440
441    if (firstAudioBuffer == NULL || firstVideoBuffer == NULL) {
442        // EOS signalled on either queue.
443        syncQueuesDone();
444        return;
445    }
446
447    int64_t firstAudioTimeUs;
448    int64_t firstVideoTimeUs;
449    CHECK(firstAudioBuffer->meta()
450            ->findInt64("timeUs", &firstAudioTimeUs));
451    CHECK(firstVideoBuffer->meta()
452            ->findInt64("timeUs", &firstVideoTimeUs));
453
454    int64_t diff = firstVideoTimeUs - firstAudioTimeUs;
455
456    ALOGV("queueDiff = %.2f secs", diff / 1E6);
457
458    if (diff > 100000ll) {
459        // Audio data starts More than 0.1 secs before video.
460        // Drop some audio.
461
462        (*mAudioQueue.begin()).mNotifyConsumed->post();
463        mAudioQueue.erase(mAudioQueue.begin());
464        return;
465    }
466
467    syncQueuesDone();
468}
469
470void NuPlayer::Renderer::syncQueuesDone() {
471    if (!mSyncQueues) {
472        return;
473    }
474
475    mSyncQueues = false;
476
477    if (!mAudioQueue.empty()) {
478        postDrainAudioQueue();
479    }
480
481    if (!mVideoQueue.empty()) {
482        postDrainVideoQueue();
483    }
484}
485
486void NuPlayer::Renderer::onQueueEOS(const sp<AMessage> &msg) {
487    int32_t audio;
488    CHECK(msg->findInt32("audio", &audio));
489
490    if (dropBufferWhileFlushing(audio, msg)) {
491        return;
492    }
493
494    int32_t finalResult;
495    CHECK(msg->findInt32("finalResult", &finalResult));
496
497    QueueEntry entry;
498    entry.mOffset = 0;
499    entry.mFinalResult = finalResult;
500
501    if (audio) {
502        mAudioQueue.push_back(entry);
503        postDrainAudioQueue();
504    } else {
505        mVideoQueue.push_back(entry);
506        postDrainVideoQueue();
507    }
508}
509
510void NuPlayer::Renderer::onFlush(const sp<AMessage> &msg) {
511    int32_t audio;
512    CHECK(msg->findInt32("audio", &audio));
513
514    // If we're currently syncing the queues, i.e. dropping audio while
515    // aligning the first audio/video buffer times and only one of the
516    // two queues has data, we may starve that queue by not requesting
517    // more buffers from the decoder. If the other source then encounters
518    // a discontinuity that leads to flushing, we'll never find the
519    // corresponding discontinuity on the other queue.
520    // Therefore we'll stop syncing the queues if at least one of them
521    // is flushed.
522    syncQueuesDone();
523
524    if (audio) {
525        flushQueue(&mAudioQueue);
526
527        Mutex::Autolock autoLock(mFlushLock);
528        mFlushingAudio = false;
529
530        mDrainAudioQueuePending = false;
531        ++mAudioQueueGeneration;
532    } else {
533        flushQueue(&mVideoQueue);
534
535        Mutex::Autolock autoLock(mFlushLock);
536        mFlushingVideo = false;
537
538        mDrainVideoQueuePending = false;
539        ++mVideoQueueGeneration;
540    }
541
542    notifyFlushComplete(audio);
543}
544
545void NuPlayer::Renderer::flushQueue(List<QueueEntry> *queue) {
546    while (!queue->empty()) {
547        QueueEntry *entry = &*queue->begin();
548
549        if (entry->mBuffer != NULL) {
550            entry->mNotifyConsumed->post();
551        }
552
553        queue->erase(queue->begin());
554        entry = NULL;
555    }
556}
557
558void NuPlayer::Renderer::notifyFlushComplete(bool audio) {
559    sp<AMessage> notify = mNotify->dup();
560    notify->setInt32("what", kWhatFlushComplete);
561    notify->setInt32("audio", static_cast<int32_t>(audio));
562    notify->post();
563}
564
565bool NuPlayer::Renderer::dropBufferWhileFlushing(
566        bool audio, const sp<AMessage> &msg) {
567    bool flushing = false;
568
569    {
570        Mutex::Autolock autoLock(mFlushLock);
571        if (audio) {
572            flushing = mFlushingAudio;
573        } else {
574            flushing = mFlushingVideo;
575        }
576    }
577
578    if (!flushing) {
579        return false;
580    }
581
582    sp<AMessage> notifyConsumed;
583    if (msg->findMessage("notifyConsumed", &notifyConsumed)) {
584        notifyConsumed->post();
585    }
586
587    return true;
588}
589
590void NuPlayer::Renderer::onAudioSinkChanged() {
591    CHECK(!mDrainAudioQueuePending);
592    mNumFramesWritten = 0;
593}
594
595void NuPlayer::Renderer::notifyPosition() {
596    if (mAnchorTimeRealUs < 0 || mAnchorTimeMediaUs < 0) {
597        return;
598    }
599
600    int64_t nowUs = ALooper::GetNowUs();
601
602    if (mLastPositionUpdateUs >= 0
603            && nowUs < mLastPositionUpdateUs + kMinPositionUpdateDelayUs) {
604        return;
605    }
606    mLastPositionUpdateUs = nowUs;
607
608    int64_t positionUs = (nowUs - mAnchorTimeRealUs) + mAnchorTimeMediaUs;
609
610    sp<AMessage> notify = mNotify->dup();
611    notify->setInt32("what", kWhatPosition);
612    notify->setInt64("positionUs", positionUs);
613    notify->setInt64("videoLateByUs", mVideoLateByUs);
614    notify->post();
615}
616
617void NuPlayer::Renderer::onPause() {
618    CHECK(!mPaused);
619
620    mDrainAudioQueuePending = false;
621    ++mAudioQueueGeneration;
622
623    mDrainVideoQueuePending = false;
624    ++mVideoQueueGeneration;
625
626    if (mHasAudio) {
627        mAudioSink->pause();
628    }
629
630    ALOGV("now paused audio queue has %d entries, video has %d entries",
631          mAudioQueue.size(), mVideoQueue.size());
632
633    mPaused = true;
634}
635
636void NuPlayer::Renderer::onResume() {
637    if (!mPaused) {
638        return;
639    }
640
641    if (mHasAudio) {
642        mAudioSink->start();
643    }
644
645    mPaused = false;
646
647    if (!mAudioQueue.empty()) {
648        postDrainAudioQueue();
649    }
650
651    if (!mVideoQueue.empty()) {
652        postDrainVideoQueue();
653    }
654}
655
656}  // namespace android
657
658