MediaCodecSource.cpp revision ea1a45dbdf7fd6f435f92d20a95f432cf3f147b5 
1/*
2 * Copyright 2014, 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 "MediaCodecSource"
19#define DEBUG_DRIFT_TIME 0
20
21#include <inttypes.h>
22
23#include <gui/IGraphicBufferConsumer.h>
24#include <gui/IGraphicBufferProducer.h>
25#include <gui/Surface.h>
26#include <media/ICrypto.h>
27#include <media/stagefright/foundation/ABuffer.h>
28#include <media/stagefright/foundation/ADebug.h>
29#include <media/stagefright/foundation/ALooper.h>
30#include <media/stagefright/foundation/AMessage.h>
31#include <media/stagefright/MediaBuffer.h>
32#include <media/stagefright/MediaCodec.h>
33#include <media/stagefright/MediaCodecList.h>
34#include <media/stagefright/MediaCodecSource.h>
35#include <media/stagefright/MediaErrors.h>
36#include <media/stagefright/MediaSource.h>
37#include <media/stagefright/MetaData.h>
38#include <media/stagefright/PersistentSurface.h>
39#include <media/stagefright/Utils.h>
40
41namespace android {
42
43const int kDefaultSwVideoEncoderFormat = HAL_PIXEL_FORMAT_YCbCr_420_888;
44const int kDefaultSwVideoEncoderDataSpace = HAL_DATASPACE_BT709;
45
46const int kStopTimeoutUs = 300000; // allow 1 sec for shutting down encoder
47
48struct MediaCodecSource::Puller : public AHandler {
49    Puller(const sp<MediaSource> &source);
50
51    status_t start(const sp<MetaData> &meta, const sp<AMessage> &notify);
52    void stop();
53    void stopSource();
54    void pause();
55    void resume();
56
57    bool readBuffer(MediaBuffer **buffer);
58
59protected:
60    virtual void onMessageReceived(const sp<AMessage> &msg);
61    virtual ~Puller();
62
63private:
64    enum {
65        kWhatStart = 'msta',
66        kWhatStop,
67        kWhatPull,
68    };
69
70    sp<MediaSource> mSource;
71    sp<AMessage> mNotify;
72    sp<ALooper> mLooper;
73    bool mIsAudio;
74
75    struct Queue {
76        Queue()
77            : mReadPendingSince(0),
78              mPaused(false),
79              mPulling(false) { }
80        int64_t mReadPendingSince;
81        bool mPaused;
82        bool mPulling;
83        Vector<MediaBuffer *> mReadBuffers;
84
85        void flush();
86        // if queue is empty, return false and set *|buffer| to NULL . Otherwise, pop
87        // buffer from front of the queue, place it into *|buffer| and return true.
88        bool readBuffer(MediaBuffer **buffer);
89        // add a buffer to the back of the queue
90        void pushBuffer(MediaBuffer *mbuf);
91    };
92    Mutexed<Queue> mQueue;
93
94    status_t postSynchronouslyAndReturnError(const sp<AMessage> &msg);
95    void schedulePull();
96    void handleEOS();
97
98    DISALLOW_EVIL_CONSTRUCTORS(Puller);
99};
100
101MediaCodecSource::Puller::Puller(const sp<MediaSource> &source)
102    : mSource(source),
103      mLooper(new ALooper()),
104      mIsAudio(false)
105{
106    sp<MetaData> meta = source->getFormat();
107    const char *mime;
108    CHECK(meta->findCString(kKeyMIMEType, &mime));
109
110    mIsAudio = !strncasecmp(mime, "audio/", 6);
111
112    mLooper->setName("pull_looper");
113}
114
115MediaCodecSource::Puller::~Puller() {
116    mLooper->unregisterHandler(id());
117    mLooper->stop();
118}
119
120void MediaCodecSource::Puller::Queue::pushBuffer(MediaBuffer *mbuf) {
121    mReadBuffers.push_back(mbuf);
122}
123
124bool MediaCodecSource::Puller::Queue::readBuffer(MediaBuffer **mbuf) {
125    if (mReadBuffers.empty()) {
126        *mbuf = NULL;
127        return false;
128    }
129    *mbuf = *mReadBuffers.begin();
130    mReadBuffers.erase(mReadBuffers.begin());
131    return true;
132}
133
134void MediaCodecSource::Puller::Queue::flush() {
135    MediaBuffer *mbuf;
136    while (readBuffer(&mbuf)) {
137        // there are no null buffers in the queue
138        mbuf->release();
139    }
140}
141
142bool MediaCodecSource::Puller::readBuffer(MediaBuffer **mbuf) {
143    Mutexed<Queue>::Locked queue(mQueue);
144    return queue->readBuffer(mbuf);
145}
146
147status_t MediaCodecSource::Puller::postSynchronouslyAndReturnError(
148        const sp<AMessage> &msg) {
149    sp<AMessage> response;
150    status_t err = msg->postAndAwaitResponse(&response);
151
152    if (err != OK) {
153        return err;
154    }
155
156    if (!response->findInt32("err", &err)) {
157        err = OK;
158    }
159
160    return err;
161}
162
163status_t MediaCodecSource::Puller::start(const sp<MetaData> &meta, const sp<AMessage> &notify) {
164    ALOGV("puller (%s) start", mIsAudio ? "audio" : "video");
165    mLooper->start(
166            false /* runOnCallingThread */,
167            false /* canCallJava */,
168            PRIORITY_AUDIO);
169    mLooper->registerHandler(this);
170    mNotify = notify;
171
172    sp<AMessage> msg = new AMessage(kWhatStart, this);
173    msg->setObject("meta", meta);
174    return postSynchronouslyAndReturnError(msg);
175}
176
177void MediaCodecSource::Puller::stop() {
178    bool interrupt = false;
179    {
180        // mark stopping before actually reaching kWhatStop on the looper, so the pulling will
181        // stop.
182        Mutexed<Queue>::Locked queue(mQueue);
183        queue->mPulling = false;
184        interrupt = queue->mReadPendingSince && (queue->mReadPendingSince < ALooper::GetNowUs() - 1000000);
185        queue->flush(); // flush any unprocessed pulled buffers
186    }
187
188    if (interrupt) {
189        // call source->stop if read has been pending for over a second
190        // TODO: we should really call this if kWhatStop has not returned for more than a second.
191        mSource->stop();
192    }
193}
194
195void MediaCodecSource::Puller::stopSource() {
196    (new AMessage(kWhatStop, this))->post();
197}
198
199void MediaCodecSource::Puller::pause() {
200    Mutexed<Queue>::Locked queue(mQueue);
201    queue->mPaused = true;
202}
203
204void MediaCodecSource::Puller::resume() {
205    Mutexed<Queue>::Locked queue(mQueue);
206    queue->mPaused = false;
207}
208
209void MediaCodecSource::Puller::schedulePull() {
210    (new AMessage(kWhatPull, this))->post();
211}
212
213void MediaCodecSource::Puller::handleEOS() {
214    ALOGV("puller (%s) posting EOS", mIsAudio ? "audio" : "video");
215    sp<AMessage> msg = mNotify->dup();
216    msg->setInt32("eos", 1);
217    msg->post();
218}
219
220void MediaCodecSource::Puller::onMessageReceived(const sp<AMessage> &msg) {
221    switch (msg->what()) {
222        case kWhatStart:
223        {
224            sp<RefBase> obj;
225            CHECK(msg->findObject("meta", &obj));
226
227            {
228                Mutexed<Queue>::Locked queue(mQueue);
229                queue->mPulling = true;
230            }
231
232            status_t err = mSource->start(static_cast<MetaData *>(obj.get()));
233
234            if (err == OK) {
235                schedulePull();
236            }
237
238            sp<AMessage> response = new AMessage;
239            response->setInt32("err", err);
240
241            sp<AReplyToken> replyID;
242            CHECK(msg->senderAwaitsResponse(&replyID));
243            response->postReply(replyID);
244            break;
245        }
246
247        case kWhatStop:
248        {
249            mSource->stop();
250            break;
251        }
252
253        case kWhatPull:
254        {
255            Mutexed<Queue>::Locked queue(mQueue);
256            queue->mReadPendingSince = ALooper::GetNowUs();
257            if (!queue->mPulling) {
258                handleEOS();
259                break;
260            }
261
262            queue.unlock();
263            MediaBuffer *mbuf = NULL;
264            status_t err = mSource->read(&mbuf);
265            queue.lock();
266
267            queue->mReadPendingSince = 0;
268            // if we need to discard buffer
269            if (!queue->mPulling || queue->mPaused || err != OK) {
270                if (mbuf != NULL) {
271                    mbuf->release();
272                    mbuf = NULL;
273                }
274                if (queue->mPulling && err == OK) {
275                    msg->post(); // if simply paused, keep pulling source
276                } else if (err == ERROR_END_OF_STREAM) {
277                    ALOGV("stream ended, mbuf %p", mbuf);
278                } else if (err != OK) {
279                    ALOGE("error %d reading stream.", err);
280                }
281            }
282
283            if (mbuf != NULL) {
284                queue->pushBuffer(mbuf);
285            }
286
287            queue.unlock();
288
289            if (mbuf != NULL) {
290                mNotify->post();
291                msg->post();
292            } else {
293                handleEOS();
294            }
295            break;
296        }
297
298        default:
299            TRESPASS();
300    }
301}
302
303MediaCodecSource::Output::Output()
304    : mEncoderReachedEOS(false),
305      mErrorCode(OK) {
306}
307
308// static
309sp<MediaCodecSource> MediaCodecSource::Create(
310        const sp<ALooper> &looper,
311        const sp<AMessage> &format,
312        const sp<MediaSource> &source,
313        const sp<IGraphicBufferConsumer> &consumer,
314        uint32_t flags) {
315    sp<MediaCodecSource> mediaSource =
316            new MediaCodecSource(looper, format, source, consumer, flags);
317
318    if (mediaSource->init() == OK) {
319        return mediaSource;
320    }
321    return NULL;
322}
323
324status_t MediaCodecSource::start(MetaData* params) {
325    sp<AMessage> msg = new AMessage(kWhatStart, mReflector);
326    msg->setObject("meta", params);
327    return postSynchronouslyAndReturnError(msg);
328}
329
330status_t MediaCodecSource::stop() {
331    sp<AMessage> msg = new AMessage(kWhatStop, mReflector);
332    return postSynchronouslyAndReturnError(msg);
333}
334
335status_t MediaCodecSource::pause() {
336    (new AMessage(kWhatPause, mReflector))->post();
337    return OK;
338}
339
340sp<IGraphicBufferProducer> MediaCodecSource::getGraphicBufferProducer() {
341    CHECK(mFlags & FLAG_USE_SURFACE_INPUT);
342    return mGraphicBufferProducer;
343}
344
345status_t MediaCodecSource::read(
346        MediaBuffer** buffer, const ReadOptions* /* options */) {
347    Mutexed<Output>::Locked output(mOutput);
348
349    *buffer = NULL;
350    while (output->mBufferQueue.size() == 0 && !output->mEncoderReachedEOS) {
351        output.waitForCondition(output->mCond);
352    }
353    if (!output->mEncoderReachedEOS) {
354        *buffer = *output->mBufferQueue.begin();
355        output->mBufferQueue.erase(output->mBufferQueue.begin());
356        return OK;
357    }
358    return output->mErrorCode;
359}
360
361void MediaCodecSource::signalBufferReturned(MediaBuffer *buffer) {
362    buffer->setObserver(0);
363    buffer->release();
364}
365
366MediaCodecSource::MediaCodecSource(
367        const sp<ALooper> &looper,
368        const sp<AMessage> &outputFormat,
369        const sp<MediaSource> &source,
370        const sp<IGraphicBufferConsumer> &consumer,
371        uint32_t flags)
372    : mLooper(looper),
373      mOutputFormat(outputFormat),
374      mMeta(new MetaData),
375      mFlags(flags),
376      mIsVideo(false),
377      mStarted(false),
378      mStopping(false),
379      mDoMoreWorkPending(false),
380      mSetEncoderFormat(false),
381      mEncoderFormat(0),
382      mEncoderDataSpace(0),
383      mGraphicBufferConsumer(consumer),
384      mFirstSampleTimeUs(-1ll),
385      mGeneration(0) {
386    CHECK(mLooper != NULL);
387
388    AString mime;
389    CHECK(mOutputFormat->findString("mime", &mime));
390
391    if (!strncasecmp("video/", mime.c_str(), 6)) {
392        mIsVideo = true;
393    }
394
395    if (!(mFlags & FLAG_USE_SURFACE_INPUT)) {
396        mPuller = new Puller(source);
397    }
398}
399
400MediaCodecSource::~MediaCodecSource() {
401    releaseEncoder();
402
403    mCodecLooper->stop();
404    mLooper->unregisterHandler(mReflector->id());
405}
406
407status_t MediaCodecSource::init() {
408    status_t err = initEncoder();
409
410    if (err != OK) {
411        releaseEncoder();
412    }
413
414    return err;
415}
416
417status_t MediaCodecSource::initEncoder() {
418    mReflector = new AHandlerReflector<MediaCodecSource>(this);
419    mLooper->registerHandler(mReflector);
420
421    mCodecLooper = new ALooper;
422    mCodecLooper->setName("codec_looper");
423    mCodecLooper->start();
424
425    if (mFlags & FLAG_USE_METADATA_INPUT) {
426        mOutputFormat->setInt32("store-metadata-in-buffers", 1);
427    }
428
429    if (mFlags & FLAG_USE_SURFACE_INPUT) {
430        mOutputFormat->setInt32("create-input-buffers-suspended", 1);
431    }
432
433    AString outputMIME;
434    CHECK(mOutputFormat->findString("mime", &outputMIME));
435
436    Vector<AString> matchingCodecs;
437    MediaCodecList::findMatchingCodecs(
438            outputMIME.c_str(), true /* encoder */,
439            ((mFlags & FLAG_PREFER_SOFTWARE_CODEC) ? MediaCodecList::kPreferSoftwareCodecs : 0),
440            &matchingCodecs);
441
442    status_t err = NO_INIT;
443    for (size_t ix = 0; ix < matchingCodecs.size(); ++ix) {
444        mEncoder = MediaCodec::CreateByComponentName(
445                mCodecLooper, matchingCodecs[ix]);
446
447        if (mEncoder == NULL) {
448            continue;
449        }
450
451        ALOGV("output format is '%s'", mOutputFormat->debugString(0).c_str());
452
453        mEncoderActivityNotify = new AMessage(kWhatEncoderActivity, mReflector);
454        mEncoder->setCallback(mEncoderActivityNotify);
455
456        err = mEncoder->configure(
457                    mOutputFormat,
458                    NULL /* nativeWindow */,
459                    NULL /* crypto */,
460                    MediaCodec::CONFIGURE_FLAG_ENCODE);
461
462        if (err == OK) {
463            break;
464        }
465        mEncoder->release();
466        mEncoder = NULL;
467    }
468
469    if (err != OK) {
470        return err;
471    }
472
473    mEncoder->getOutputFormat(&mOutputFormat);
474    convertMessageToMetaData(mOutputFormat, mMeta);
475
476    if (mFlags & FLAG_USE_SURFACE_INPUT) {
477        CHECK(mIsVideo);
478
479        if (mGraphicBufferConsumer != NULL) {
480            // When using persistent surface, we are only interested in the
481            // consumer, but have to use PersistentSurface as a wrapper to
482            // pass consumer over messages (similar to BufferProducerWrapper)
483            err = mEncoder->setInputSurface(
484                    new PersistentSurface(NULL, mGraphicBufferConsumer));
485        } else {
486            err = mEncoder->createInputSurface(&mGraphicBufferProducer);
487        }
488
489        if (err != OK) {
490            return err;
491        }
492    }
493
494    sp<AMessage> inputFormat;
495    int32_t usingSwReadOften;
496    mSetEncoderFormat = false;
497    if (mEncoder->getInputFormat(&inputFormat) == OK
498            && inputFormat->findInt32("using-sw-read-often", &usingSwReadOften)
499            && usingSwReadOften) {
500        // this is a SW encoder; signal source to allocate SW readable buffers
501        mSetEncoderFormat = true;
502        mEncoderFormat = kDefaultSwVideoEncoderFormat;
503        mEncoderDataSpace = kDefaultSwVideoEncoderDataSpace;
504    }
505
506    err = mEncoder->start();
507
508    if (err != OK) {
509        return err;
510    }
511
512    {
513        Mutexed<Output>::Locked output(mOutput);
514        output->mEncoderReachedEOS = false;
515        output->mErrorCode = OK;
516    }
517
518    return OK;
519}
520
521void MediaCodecSource::releaseEncoder() {
522    if (mEncoder == NULL) {
523        return;
524    }
525
526    mEncoder->release();
527    mEncoder.clear();
528}
529
530status_t MediaCodecSource::postSynchronouslyAndReturnError(
531        const sp<AMessage> &msg) {
532    sp<AMessage> response;
533    status_t err = msg->postAndAwaitResponse(&response);
534
535    if (err != OK) {
536        return err;
537    }
538
539    if (!response->findInt32("err", &err)) {
540        err = OK;
541    }
542
543    return err;
544}
545
546void MediaCodecSource::signalEOS(status_t err) {
547    bool reachedEOS = false;
548    {
549        Mutexed<Output>::Locked output(mOutput);
550        reachedEOS = output->mEncoderReachedEOS;
551        if (!reachedEOS) {
552            ALOGV("encoder (%s) reached EOS", mIsVideo ? "video" : "audio");
553            // release all unread media buffers
554            for (List<MediaBuffer*>::iterator it = output->mBufferQueue.begin();
555                    it != output->mBufferQueue.end(); it++) {
556                (*it)->release();
557            }
558            output->mBufferQueue.clear();
559            output->mEncoderReachedEOS = true;
560            output->mErrorCode = err;
561            output->mCond.signal();
562
563            reachedEOS = true;
564            output.unlock();
565            releaseEncoder();
566        }
567    }
568
569    if (mStopping && reachedEOS) {
570        ALOGI("encoder (%s) stopped", mIsVideo ? "video" : "audio");
571        mPuller->stopSource();
572        ALOGV("source (%s) stopped", mIsVideo ? "video" : "audio");
573        // posting reply to everyone that's waiting
574        List<sp<AReplyToken>>::iterator it;
575        for (it = mStopReplyIDQueue.begin();
576                it != mStopReplyIDQueue.end(); it++) {
577            (new AMessage)->postReply(*it);
578        }
579        mStopReplyIDQueue.clear();
580        mStopping = false;
581        ++mGeneration;
582    }
583}
584
585void MediaCodecSource::suspend() {
586    CHECK(mFlags & FLAG_USE_SURFACE_INPUT);
587    if (mEncoder != NULL) {
588        sp<AMessage> params = new AMessage;
589        params->setInt32("drop-input-frames", true);
590        mEncoder->setParameters(params);
591    }
592}
593
594void MediaCodecSource::resume(int64_t skipFramesBeforeUs) {
595    CHECK(mFlags & FLAG_USE_SURFACE_INPUT);
596    if (mEncoder != NULL) {
597        sp<AMessage> params = new AMessage;
598        params->setInt32("drop-input-frames", false);
599        if (skipFramesBeforeUs > 0) {
600            params->setInt64("skip-frames-before", skipFramesBeforeUs);
601        }
602        mEncoder->setParameters(params);
603    }
604}
605
606status_t MediaCodecSource::feedEncoderInputBuffers() {
607    MediaBuffer* mbuf = NULL;
608    while (!mAvailEncoderInputIndices.empty() && mPuller->readBuffer(&mbuf)) {
609        size_t bufferIndex = *mAvailEncoderInputIndices.begin();
610        mAvailEncoderInputIndices.erase(mAvailEncoderInputIndices.begin());
611
612        int64_t timeUs = 0ll;
613        uint32_t flags = 0;
614        size_t size = 0;
615
616        if (mbuf != NULL) {
617            CHECK(mbuf->meta_data()->findInt64(kKeyTime, &timeUs));
618
619            // push decoding time for video, or drift time for audio
620            if (mIsVideo) {
621                mDecodingTimeQueue.push_back(timeUs);
622            } else {
623#if DEBUG_DRIFT_TIME
624                if (mFirstSampleTimeUs < 0ll) {
625                    mFirstSampleTimeUs = timeUs;
626                }
627
628                int64_t driftTimeUs = 0;
629                if (mbuf->meta_data()->findInt64(kKeyDriftTime, &driftTimeUs)
630                        && driftTimeUs) {
631                    driftTimeUs = timeUs - mFirstSampleTimeUs - driftTimeUs;
632                }
633                mDriftTimeQueue.push_back(driftTimeUs);
634#endif // DEBUG_DRIFT_TIME
635            }
636
637            sp<ABuffer> inbuf;
638            status_t err = mEncoder->getInputBuffer(bufferIndex, &inbuf);
639            if (err != OK || inbuf == NULL) {
640                mbuf->release();
641                signalEOS();
642                break;
643            }
644
645            size = mbuf->size();
646
647            memcpy(inbuf->data(), mbuf->data(), size);
648
649            if (mIsVideo) {
650                // video encoder will release MediaBuffer when done
651                // with underlying data.
652                inbuf->setMediaBufferBase(mbuf);
653            } else {
654                mbuf->release();
655            }
656        } else {
657            flags = MediaCodec::BUFFER_FLAG_EOS;
658        }
659
660        status_t err = mEncoder->queueInputBuffer(
661                bufferIndex, 0, size, timeUs, flags);
662
663        if (err != OK) {
664            return err;
665        }
666    }
667
668    return OK;
669}
670
671status_t MediaCodecSource::onStart(MetaData *params) {
672    if (mStopping) {
673        ALOGE("Failed to start while we're stopping");
674        return INVALID_OPERATION;
675    }
676
677    if (mStarted) {
678        ALOGI("MediaCodecSource (%s) resuming", mIsVideo ? "video" : "audio");
679        if (mFlags & FLAG_USE_SURFACE_INPUT) {
680            resume();
681        } else {
682            CHECK(mPuller != NULL);
683            mPuller->resume();
684        }
685        return OK;
686    }
687
688    ALOGI("MediaCodecSource (%s) starting", mIsVideo ? "video" : "audio");
689
690    status_t err = OK;
691
692    if (mFlags & FLAG_USE_SURFACE_INPUT) {
693        int64_t startTimeUs;
694        if (!params || !params->findInt64(kKeyTime, &startTimeUs)) {
695            startTimeUs = -1ll;
696        }
697        resume(startTimeUs);
698    } else {
699        CHECK(mPuller != NULL);
700        sp<MetaData> meta = params;
701        if (mSetEncoderFormat) {
702            if (meta == NULL) {
703                meta = new MetaData;
704            }
705            meta->setInt32(kKeyPixelFormat, mEncoderFormat);
706            meta->setInt32(kKeyColorSpace, mEncoderDataSpace);
707        }
708
709        sp<AMessage> notify = new AMessage(kWhatPullerNotify, mReflector);
710        err = mPuller->start(meta.get(), notify);
711        if (err != OK) {
712            return err;
713        }
714    }
715
716    ALOGI("MediaCodecSource (%s) started", mIsVideo ? "video" : "audio");
717
718    mStarted = true;
719    return OK;
720}
721
722void MediaCodecSource::onMessageReceived(const sp<AMessage> &msg) {
723    switch (msg->what()) {
724    case kWhatPullerNotify:
725    {
726        int32_t eos = 0;
727        if (msg->findInt32("eos", &eos) && eos) {
728            ALOGV("puller (%s) reached EOS", mIsVideo ? "video" : "audio");
729            signalEOS();
730            break;
731        }
732
733        if (mEncoder == NULL) {
734            ALOGV("got msg '%s' after encoder shutdown.", msg->debugString().c_str());
735            break;
736        }
737
738        feedEncoderInputBuffers();
739        break;
740    }
741    case kWhatEncoderActivity:
742    {
743        if (mEncoder == NULL) {
744            break;
745        }
746
747        int32_t cbID;
748        CHECK(msg->findInt32("callbackID", &cbID));
749        if (cbID == MediaCodec::CB_INPUT_AVAILABLE) {
750            int32_t index;
751            CHECK(msg->findInt32("index", &index));
752
753            mAvailEncoderInputIndices.push_back(index);
754            feedEncoderInputBuffers();
755        } else if (cbID == MediaCodec::CB_OUTPUT_AVAILABLE) {
756            int32_t index;
757            size_t offset;
758            size_t size;
759            int64_t timeUs;
760            int32_t flags;
761
762            CHECK(msg->findInt32("index", &index));
763            CHECK(msg->findSize("offset", &offset));
764            CHECK(msg->findSize("size", &size));
765            CHECK(msg->findInt64("timeUs", &timeUs));
766            CHECK(msg->findInt32("flags", &flags));
767
768            if (flags & MediaCodec::BUFFER_FLAG_EOS) {
769                mEncoder->releaseOutputBuffer(index);
770                signalEOS();
771                break;
772            }
773
774            sp<ABuffer> outbuf;
775            status_t err = mEncoder->getOutputBuffer(index, &outbuf);
776            if (err != OK || outbuf == NULL) {
777                signalEOS();
778                break;
779            }
780
781            MediaBuffer *mbuf = new MediaBuffer(outbuf->size());
782            memcpy(mbuf->data(), outbuf->data(), outbuf->size());
783
784            if (!(flags & MediaCodec::BUFFER_FLAG_CODECCONFIG)) {
785                if (mIsVideo) {
786                    int64_t decodingTimeUs;
787                    if (mFlags & FLAG_USE_SURFACE_INPUT) {
788                        // GraphicBufferSource is supposed to discard samples
789                        // queued before start, and offset timeUs by start time
790                        CHECK_GE(timeUs, 0ll);
791                        // TODO:
792                        // Decoding time for surface source is unavailable,
793                        // use presentation time for now. May need to move
794                        // this logic into MediaCodec.
795                        decodingTimeUs = timeUs;
796                    } else {
797                        CHECK(!mDecodingTimeQueue.empty());
798                        decodingTimeUs = *(mDecodingTimeQueue.begin());
799                        mDecodingTimeQueue.erase(mDecodingTimeQueue.begin());
800                    }
801                    mbuf->meta_data()->setInt64(kKeyDecodingTime, decodingTimeUs);
802
803                    ALOGV("[video] time %" PRId64 " us (%.2f secs), dts/pts diff %" PRId64,
804                            timeUs, timeUs / 1E6, decodingTimeUs - timeUs);
805                } else {
806                    int64_t driftTimeUs = 0;
807#if DEBUG_DRIFT_TIME
808                    CHECK(!mDriftTimeQueue.empty());
809                    driftTimeUs = *(mDriftTimeQueue.begin());
810                    mDriftTimeQueue.erase(mDriftTimeQueue.begin());
811                    mbuf->meta_data()->setInt64(kKeyDriftTime, driftTimeUs);
812#endif // DEBUG_DRIFT_TIME
813                    ALOGV("[audio] time %" PRId64 " us (%.2f secs), drift %" PRId64,
814                            timeUs, timeUs / 1E6, driftTimeUs);
815                }
816                mbuf->meta_data()->setInt64(kKeyTime, timeUs);
817            } else {
818                mbuf->meta_data()->setInt32(kKeyIsCodecConfig, true);
819            }
820            if (flags & MediaCodec::BUFFER_FLAG_SYNCFRAME) {
821                mbuf->meta_data()->setInt32(kKeyIsSyncFrame, true);
822            }
823            mbuf->setObserver(this);
824            mbuf->add_ref();
825
826            {
827                Mutexed<Output>::Locked output(mOutput);
828                output->mBufferQueue.push_back(mbuf);
829                output->mCond.signal();
830            }
831
832            mEncoder->releaseOutputBuffer(index);
833       } else if (cbID == MediaCodec::CB_ERROR) {
834            status_t err;
835            CHECK(msg->findInt32("err", &err));
836            ALOGE("Encoder (%s) reported error : 0x%x",
837                    mIsVideo ? "video" : "audio", err);
838            signalEOS();
839       }
840       break;
841    }
842    case kWhatStart:
843    {
844        sp<AReplyToken> replyID;
845        CHECK(msg->senderAwaitsResponse(&replyID));
846
847        sp<RefBase> obj;
848        CHECK(msg->findObject("meta", &obj));
849        MetaData *params = static_cast<MetaData *>(obj.get());
850
851        sp<AMessage> response = new AMessage;
852        response->setInt32("err", onStart(params));
853        response->postReply(replyID);
854        break;
855    }
856    case kWhatStop:
857    {
858        ALOGI("encoder (%s) stopping", mIsVideo ? "video" : "audio");
859
860        sp<AReplyToken> replyID;
861        CHECK(msg->senderAwaitsResponse(&replyID));
862
863        if (mOutput.lock()->mEncoderReachedEOS) {
864            // if we already reached EOS, reply and return now
865            ALOGI("encoder (%s) already stopped",
866                    mIsVideo ? "video" : "audio");
867            (new AMessage)->postReply(replyID);
868            break;
869        }
870
871        mStopReplyIDQueue.push_back(replyID);
872        if (mStopping) {
873            // nothing to do if we're already stopping, reply will be posted
874            // to all when we're stopped.
875            break;
876        }
877
878        mStopping = true;
879
880        // if using surface, signal source EOS and wait for EOS to come back.
881        // otherwise, stop puller (which also clears the input buffer queue)
882        // and wait for the EOS message. We cannot call source->stop() because
883        // the encoder may still be processing input buffers.
884        if (mFlags & FLAG_USE_SURFACE_INPUT) {
885            mEncoder->signalEndOfInputStream();
886        } else {
887            mPuller->stop();
888        }
889
890        // complete stop even if encoder/puller stalled
891        sp<AMessage> timeoutMsg = new AMessage(kWhatStopStalled, mReflector);
892        timeoutMsg->setInt32("generation", mGeneration);
893        timeoutMsg->post(kStopTimeoutUs);
894        break;
895    }
896
897    case kWhatStopStalled:
898    {
899        int32_t generation;
900        CHECK(msg->findInt32("generation", &generation));
901        if (generation != mGeneration) {
902             break;
903        }
904
905        if (!(mFlags & FLAG_USE_SURFACE_INPUT)) {
906            ALOGV("source (%s) stopping", mIsVideo ? "video" : "audio");
907            mPuller->stopSource();
908            ALOGV("source (%s) stopped", mIsVideo ? "video" : "audio");
909        }
910        signalEOS();
911    }
912
913    case kWhatPause:
914    {
915        if (mFlags & FLAG_USE_SURFACE_INPUT) {
916            suspend();
917        } else {
918            CHECK(mPuller != NULL);
919            mPuller->pause();
920        }
921        break;
922    }
923    default:
924        TRESPASS();
925    }
926}
927
928} // namespace android
929