NuPlayerDecoderPassThrough.cpp revision c387f2b719a1a26c8306f77d79cc9a6f26b36813 
1/*
2 * Copyright (C) 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 "NuPlayerDecoderPassThrough"
19#include <utils/Log.h>
20#include <inttypes.h>
21
22#include "NuPlayerDecoderPassThrough.h"
23
24#include "NuPlayerRenderer.h"
25#include "NuPlayerSource.h"
26
27#include <media/ICrypto.h>
28#include <media/MediaCodecBuffer.h>
29#include <media/stagefright/foundation/ABuffer.h>
30#include <media/stagefright/foundation/ADebug.h>
31#include <media/stagefright/foundation/AMessage.h>
32#include <media/stagefright/MediaErrors.h>
33
34#include "ATSParser.h"
35
36namespace android {
37
38// TODO optimize buffer size for power consumption
39// The offload read buffer size is 32 KB but 24 KB uses less power.
40static const size_t kAggregateBufferSizeBytes = 24 * 1024;
41static const size_t kMaxCachedBytes = 200000;
42
43NuPlayer::DecoderPassThrough::DecoderPassThrough(
44        const sp<AMessage> &notify,
45        const sp<Source> &source,
46        const sp<Renderer> &renderer)
47    : DecoderBase(notify),
48      mSource(source),
49      mRenderer(renderer),
50      mSkipRenderingUntilMediaTimeUs(-1ll),
51      mReachedEOS(true),
52      mPendingAudioErr(OK),
53      mPendingBuffersToDrain(0),
54      mCachedBytes(0),
55      mComponentName("pass through decoder") {
56    ALOGW_IF(renderer == NULL, "expect a non-NULL renderer");
57}
58
59NuPlayer::DecoderPassThrough::~DecoderPassThrough() {
60}
61
62void NuPlayer::DecoderPassThrough::onConfigure(const sp<AMessage> &format) {
63    ALOGV("[%s] onConfigure", mComponentName.c_str());
64    mCachedBytes = 0;
65    mPendingBuffersToDrain = 0;
66    mReachedEOS = false;
67    ++mBufferGeneration;
68
69    onRequestInputBuffers();
70
71    int32_t hasVideo = 0;
72    format->findInt32("has-video", &hasVideo);
73
74    // The audio sink is already opened before the PassThrough decoder is created.
75    // Opening again might be relevant if decoder is instantiated after shutdown and
76    // format is different.
77    status_t err = mRenderer->openAudioSink(
78            format, true /* offloadOnly */, hasVideo,
79            AUDIO_OUTPUT_FLAG_NONE /* flags */, NULL /* isOffloaded */, mSource->isStreaming());
80    if (err != OK) {
81        handleError(err);
82    }
83}
84
85void NuPlayer::DecoderPassThrough::onSetParameters(const sp<AMessage> &/*params*/) {
86    ALOGW("onSetParameters() called unexpectedly");
87}
88
89void NuPlayer::DecoderPassThrough::onSetRenderer(
90        const sp<Renderer> &renderer) {
91    // renderer can't be changed during offloading
92    ALOGW_IF(renderer != mRenderer,
93            "ignoring request to change renderer");
94}
95
96bool NuPlayer::DecoderPassThrough::isStaleReply(const sp<AMessage> &msg) {
97    int32_t generation;
98    CHECK(msg->findInt32("generation", &generation));
99    return generation != mBufferGeneration;
100}
101
102bool NuPlayer::DecoderPassThrough::isDoneFetching() const {
103    ALOGV("[%s] mCachedBytes = %zu, mReachedEOS = %d mPaused = %d",
104            mComponentName.c_str(), mCachedBytes, mReachedEOS, mPaused);
105
106    return mCachedBytes >= kMaxCachedBytes || mReachedEOS || mPaused;
107}
108
109/*
110 * returns true if we should request more data
111 */
112bool NuPlayer::DecoderPassThrough::doRequestBuffers() {
113    status_t err = OK;
114    while (!isDoneFetching()) {
115        sp<AMessage> msg = new AMessage();
116
117        err = fetchInputData(msg);
118        if (err != OK) {
119            break;
120        }
121
122        onInputBufferFetched(msg);
123    }
124
125    return err == -EWOULDBLOCK
126            && mSource->feedMoreTSData() == OK;
127}
128
129status_t NuPlayer::DecoderPassThrough::dequeueAccessUnit(sp<ABuffer> *accessUnit) {
130    status_t err;
131
132    // Did we save an accessUnit earlier because of a discontinuity?
133    if (mPendingAudioAccessUnit != NULL) {
134        *accessUnit = mPendingAudioAccessUnit;
135        mPendingAudioAccessUnit.clear();
136        err = mPendingAudioErr;
137        ALOGV("feedDecoderInputData() use mPendingAudioAccessUnit");
138    } else {
139        err = mSource->dequeueAccessUnit(true /* audio */, accessUnit);
140    }
141
142    if (err == INFO_DISCONTINUITY || err == ERROR_END_OF_STREAM) {
143        if (mAggregateBuffer != NULL) {
144            // We already have some data so save this for later.
145            mPendingAudioErr = err;
146            mPendingAudioAccessUnit = *accessUnit;
147            (*accessUnit).clear();
148            ALOGD("return aggregated buffer and save err(=%d) for later", err);
149            err = OK;
150        }
151    }
152
153    return err;
154}
155
156sp<ABuffer> NuPlayer::DecoderPassThrough::aggregateBuffer(
157        const sp<ABuffer> &accessUnit) {
158    sp<ABuffer> aggregate;
159
160    if (accessUnit == NULL) {
161        // accessUnit is saved to mPendingAudioAccessUnit
162        // return current mAggregateBuffer
163        aggregate = mAggregateBuffer;
164        mAggregateBuffer.clear();
165        return aggregate;
166    }
167
168    size_t smallSize = accessUnit->size();
169    if ((mAggregateBuffer == NULL)
170            // Don't bother if only room for a few small buffers.
171            && (smallSize < (kAggregateBufferSizeBytes / 3))) {
172        // Create a larger buffer for combining smaller buffers from the extractor.
173        mAggregateBuffer = new ABuffer(kAggregateBufferSizeBytes);
174        mAggregateBuffer->setRange(0, 0); // start empty
175    }
176
177    if (mAggregateBuffer != NULL) {
178        int64_t timeUs;
179        int64_t dummy;
180        bool smallTimestampValid = accessUnit->meta()->findInt64("timeUs", &timeUs);
181        bool bigTimestampValid = mAggregateBuffer->meta()->findInt64("timeUs", &dummy);
182        // Will the smaller buffer fit?
183        size_t bigSize = mAggregateBuffer->size();
184        size_t roomLeft = mAggregateBuffer->capacity() - bigSize;
185        // Should we save this small buffer for the next big buffer?
186        // If the first small buffer did not have a timestamp then save
187        // any buffer that does have a timestamp until the next big buffer.
188        if ((smallSize > roomLeft)
189            || (!bigTimestampValid && (bigSize > 0) && smallTimestampValid)) {
190            mPendingAudioErr = OK;
191            mPendingAudioAccessUnit = accessUnit;
192            aggregate = mAggregateBuffer;
193            mAggregateBuffer.clear();
194        } else {
195            // Grab time from first small buffer if available.
196            if ((bigSize == 0) && smallTimestampValid) {
197                mAggregateBuffer->meta()->setInt64("timeUs", timeUs);
198            }
199            // Append small buffer to the bigger buffer.
200            memcpy(mAggregateBuffer->base() + bigSize, accessUnit->data(), smallSize);
201            bigSize += smallSize;
202            mAggregateBuffer->setRange(0, bigSize);
203
204            ALOGV("feedDecoderInputData() smallSize = %zu, bigSize = %zu, capacity = %zu",
205                    smallSize, bigSize, mAggregateBuffer->capacity());
206        }
207    } else {
208        // decided not to aggregate
209        aggregate = accessUnit;
210    }
211
212    return aggregate;
213}
214
215status_t NuPlayer::DecoderPassThrough::fetchInputData(sp<AMessage> &reply) {
216    sp<ABuffer> accessUnit;
217
218    do {
219        status_t err = dequeueAccessUnit(&accessUnit);
220
221        if (err == -EWOULDBLOCK) {
222            // Flush out the aggregate buffer to try to avoid underrun.
223            accessUnit = aggregateBuffer(NULL /* accessUnit */);
224            if (accessUnit != NULL) {
225                break;
226            }
227            return err;
228        } else if (err != OK) {
229            if (err == INFO_DISCONTINUITY) {
230                int32_t type;
231                CHECK(accessUnit->meta()->findInt32("discontinuity", &type));
232
233                bool formatChange =
234                        (type & ATSParser::DISCONTINUITY_AUDIO_FORMAT) != 0;
235
236                bool timeChange =
237                        (type & ATSParser::DISCONTINUITY_TIME) != 0;
238
239                ALOGI("audio discontinuity (formatChange=%d, time=%d)",
240                        formatChange, timeChange);
241
242                if (formatChange || timeChange) {
243                    sp<AMessage> msg = mNotify->dup();
244                    msg->setInt32("what", kWhatInputDiscontinuity);
245                    // will perform seamless format change,
246                    // only notify NuPlayer to scan sources
247                    msg->setInt32("formatChange", false);
248                    msg->post();
249                }
250
251                if (timeChange) {
252                    doFlush(false /* notifyComplete */);
253                    err = OK;
254                } else if (formatChange) {
255                    // do seamless format change
256                    err = OK;
257                } else {
258                    // This stream is unaffected by the discontinuity
259                    return -EWOULDBLOCK;
260                }
261            }
262
263            reply->setInt32("err", err);
264            return OK;
265        }
266
267        accessUnit = aggregateBuffer(accessUnit);
268    } while (accessUnit == NULL);
269
270#if 0
271    int64_t mediaTimeUs;
272    CHECK(accessUnit->meta()->findInt64("timeUs", &mediaTimeUs));
273    ALOGV("feeding audio input buffer at media time %.2f secs",
274         mediaTimeUs / 1E6);
275#endif
276
277    reply->setBuffer("buffer", accessUnit);
278
279    return OK;
280}
281
282void NuPlayer::DecoderPassThrough::onInputBufferFetched(
283        const sp<AMessage> &msg) {
284    if (mReachedEOS) {
285        return;
286    }
287
288    sp<ABuffer> buffer;
289    bool hasBuffer = msg->findBuffer("buffer", &buffer);
290    if (buffer == NULL) {
291        int32_t streamErr = ERROR_END_OF_STREAM;
292        CHECK(msg->findInt32("err", &streamErr) || !hasBuffer);
293        if (streamErr == OK) {
294            return;
295        }
296
297        mReachedEOS = true;
298        if (mRenderer != NULL) {
299            mRenderer->queueEOS(true /* audio */, ERROR_END_OF_STREAM);
300        }
301        return;
302    }
303
304    sp<AMessage> extra;
305    if (buffer->meta()->findMessage("extra", &extra) && extra != NULL) {
306        int64_t resumeAtMediaTimeUs;
307        if (extra->findInt64(
308                    "resume-at-mediatimeUs", &resumeAtMediaTimeUs)) {
309            ALOGI("[%s] suppressing rendering until %lld us",
310                    mComponentName.c_str(), (long long)resumeAtMediaTimeUs);
311            mSkipRenderingUntilMediaTimeUs = resumeAtMediaTimeUs;
312        }
313    }
314
315    int32_t bufferSize = buffer->size();
316    mCachedBytes += bufferSize;
317
318    int64_t timeUs = 0;
319    CHECK(buffer->meta()->findInt64("timeUs", &timeUs));
320    if (mSkipRenderingUntilMediaTimeUs >= 0) {
321        if (timeUs < mSkipRenderingUntilMediaTimeUs) {
322            ALOGV("[%s] dropping buffer at time %lld as requested.",
323                     mComponentName.c_str(), (long long)timeUs);
324
325            onBufferConsumed(bufferSize);
326            return;
327        }
328
329        mSkipRenderingUntilMediaTimeUs = -1;
330    }
331
332    if (mRenderer == NULL) {
333        onBufferConsumed(bufferSize);
334        return;
335    }
336
337    sp<AMessage> reply = new AMessage(kWhatBufferConsumed, this);
338    reply->setInt32("generation", mBufferGeneration);
339    reply->setInt32("size", bufferSize);
340
341    sp<MediaCodecBuffer> mcBuffer = new MediaCodecBuffer(nullptr, buffer);
342    mcBuffer->meta()->setInt64("timeUs", timeUs);
343
344    mRenderer->queueBuffer(true /* audio */, mcBuffer, reply);
345
346    ++mPendingBuffersToDrain;
347    ALOGV("onInputBufferFilled: #ToDrain = %zu, cachedBytes = %zu",
348            mPendingBuffersToDrain, mCachedBytes);
349}
350
351void NuPlayer::DecoderPassThrough::onBufferConsumed(int32_t size) {
352    --mPendingBuffersToDrain;
353    mCachedBytes -= size;
354    ALOGV("onBufferConsumed: #ToDrain = %zu, cachedBytes = %zu",
355            mPendingBuffersToDrain, mCachedBytes);
356    onRequestInputBuffers();
357}
358
359void NuPlayer::DecoderPassThrough::onResume(bool notifyComplete) {
360    mPaused = false;
361
362    onRequestInputBuffers();
363
364    if (notifyComplete) {
365        sp<AMessage> notify = mNotify->dup();
366        notify->setInt32("what", kWhatResumeCompleted);
367        notify->post();
368    }
369}
370
371void NuPlayer::DecoderPassThrough::doFlush(bool notifyComplete) {
372    ++mBufferGeneration;
373    mSkipRenderingUntilMediaTimeUs = -1;
374    mPendingAudioAccessUnit.clear();
375    mPendingAudioErr = OK;
376    mAggregateBuffer.clear();
377
378    if (mRenderer != NULL) {
379        mRenderer->flush(true /* audio */, notifyComplete);
380        mRenderer->signalTimeDiscontinuity();
381    }
382
383    mPendingBuffersToDrain = 0;
384    mCachedBytes = 0;
385    mReachedEOS = false;
386}
387
388void NuPlayer::DecoderPassThrough::onFlush() {
389    doFlush(true /* notifyComplete */);
390
391    mPaused = true;
392    sp<AMessage> notify = mNotify->dup();
393    notify->setInt32("what", kWhatFlushCompleted);
394    notify->post();
395
396}
397
398void NuPlayer::DecoderPassThrough::onShutdown(bool notifyComplete) {
399    ++mBufferGeneration;
400    mSkipRenderingUntilMediaTimeUs = -1;
401
402    if (notifyComplete) {
403        sp<AMessage> notify = mNotify->dup();
404        notify->setInt32("what", kWhatShutdownCompleted);
405        notify->post();
406    }
407
408    mReachedEOS = true;
409}
410
411void NuPlayer::DecoderPassThrough::onMessageReceived(const sp<AMessage> &msg) {
412    ALOGV("[%s] onMessage: %s", mComponentName.c_str(),
413            msg->debugString().c_str());
414
415    switch (msg->what()) {
416        case kWhatBufferConsumed:
417        {
418            if (!isStaleReply(msg)) {
419                int32_t size;
420                CHECK(msg->findInt32("size", &size));
421                onBufferConsumed(size);
422            }
423            break;
424        }
425
426        default:
427            DecoderBase::onMessageReceived(msg);
428            break;
429    }
430}
431
432}  // namespace android
433