NuPlayerDecoderPassThrough.cpp revision 7137ec7e005a5a6e3c0edb91cfacf16a31f4bf6a 
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/stagefright/foundation/ABuffer.h>
29#include <media/stagefright/foundation/ADebug.h>
30#include <media/stagefright/foundation/AMessage.h>
31#include <media/stagefright/MediaErrors.h>
32
33#include "ATSParser.h"
34
35namespace android {
36
37// TODO optimize buffer size for power consumption
38// The offload read buffer size is 32 KB but 24 KB uses less power.
39static const size_t kAggregateBufferSizeBytes = 24 * 1024;
40static const size_t kMaxCachedBytes = 200000;
41
42NuPlayer::DecoderPassThrough::DecoderPassThrough(
43        const sp<AMessage> &notify,
44        const sp<Source> &source,
45        const sp<Renderer> &renderer)
46    : mNotify(notify),
47      mSource(source),
48      mRenderer(renderer),
49      mSkipRenderingUntilMediaTimeUs(-1ll),
50      mBufferGeneration(0),
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::getStats(
63        int64_t *numFramesTotal, int64_t *numFramesDropped) const {
64    *numFramesTotal = 0;
65    *numFramesDropped = 0;
66}
67
68void NuPlayer::DecoderPassThrough::onConfigure(const sp<AMessage> &format) {
69    ALOGV("[%s] onConfigure", mComponentName.c_str());
70    mCachedBytes = 0;
71    mPendingBuffersToDrain = 0;
72    mReachedEOS = false;
73    ++mBufferGeneration;
74
75    onRequestInputBuffers();
76
77    uint32_t flags;
78    int64_t durationUs;
79    if (mSource->getDuration(&durationUs) == OK &&
80            durationUs > AUDIO_SINK_MIN_DEEP_BUFFER_DURATION_US) {
81        flags = AUDIO_OUTPUT_FLAG_DEEP_BUFFER;
82    } else {
83        flags = AUDIO_OUTPUT_FLAG_NONE;
84    }
85
86    mRenderer->openAudioSink(
87            format, true /* offloadOnly */, false /* hasVideo */, flags);
88}
89
90void NuPlayer::DecoderPassThrough::onSetRenderer(
91        const sp<Renderer> &renderer) {
92    // renderer can't be changed during offloading
93    ALOGW_IF(renderer != mRenderer,
94            "ignoring request to change renderer");
95}
96
97void NuPlayer::DecoderPassThrough::onGetInputBuffers(
98        Vector<sp<ABuffer> > * /* dstBuffers */) {
99    ALOGE("onGetInputBuffers() called unexpectedly");
100}
101
102bool NuPlayer::DecoderPassThrough::isStaleReply(const sp<AMessage> &msg) {
103    int32_t generation;
104    CHECK(msg->findInt32("generation", &generation));
105    return generation != mBufferGeneration;
106}
107
108bool NuPlayer::DecoderPassThrough::isCacheFullOrEOS() const {
109    ALOGV("[%s] mCachedBytes = %zu, mReachedEOS = %d",
110            mComponentName.c_str(), mCachedBytes, mReachedEOS);
111
112    return mCachedBytes >= kMaxCachedBytes || mReachedEOS;
113}
114
115void NuPlayer::DecoderPassThrough::doRequestBuffers() {
116    status_t err = OK;
117    while (!isCacheFullOrEOS()) {
118        sp<AMessage> msg = new AMessage();
119
120        err = fetchInputData(msg);
121        if (err != OK) {
122            break;
123        }
124
125        onInputBufferFetched(msg);
126    }
127
128    if (err == -EWOULDBLOCK
129            && mSource->feedMoreTSData() == OK) {
130        scheduleRequestBuffers();
131    }
132}
133
134status_t NuPlayer::DecoderPassThrough::dequeueAccessUnit(sp<ABuffer> *accessUnit) {
135    status_t err;
136
137    // Did we save an accessUnit earlier because of a discontinuity?
138    if (mPendingAudioAccessUnit != NULL) {
139        *accessUnit = mPendingAudioAccessUnit;
140        mPendingAudioAccessUnit.clear();
141        err = mPendingAudioErr;
142        ALOGV("feedDecoderInputData() use mPendingAudioAccessUnit");
143    } else {
144        err = mSource->dequeueAccessUnit(true /* audio */, accessUnit);
145    }
146
147    if (err == INFO_DISCONTINUITY || err == ERROR_END_OF_STREAM) {
148        if (mAggregateBuffer != NULL) {
149            // We already have some data so save this for later.
150            mPendingAudioErr = err;
151            mPendingAudioAccessUnit = *accessUnit;
152            (*accessUnit).clear();
153            ALOGD("return aggregated buffer and save err(=%d) for later", err);
154            err = OK;
155        }
156    }
157
158    return err;
159}
160
161sp<ABuffer> NuPlayer::DecoderPassThrough::aggregateBuffer(
162        const sp<ABuffer> &accessUnit) {
163    sp<ABuffer> aggregate;
164
165    if (accessUnit == NULL) {
166        // accessUnit is saved to mPendingAudioAccessUnit
167        // return current mAggregateBuffer
168        aggregate = mAggregateBuffer;
169        mAggregateBuffer.clear();
170        return aggregate;
171    }
172
173    size_t smallSize = accessUnit->size();
174    if ((mAggregateBuffer == NULL)
175            // Don't bother if only room for a few small buffers.
176            && (smallSize < (kAggregateBufferSizeBytes / 3))) {
177        // Create a larger buffer for combining smaller buffers from the extractor.
178        mAggregateBuffer = new ABuffer(kAggregateBufferSizeBytes);
179        mAggregateBuffer->setRange(0, 0); // start empty
180    }
181
182    if (mAggregateBuffer != NULL) {
183        int64_t timeUs;
184        int64_t dummy;
185        bool smallTimestampValid = accessUnit->meta()->findInt64("timeUs", &timeUs);
186        bool bigTimestampValid = mAggregateBuffer->meta()->findInt64("timeUs", &dummy);
187        // Will the smaller buffer fit?
188        size_t bigSize = mAggregateBuffer->size();
189        size_t roomLeft = mAggregateBuffer->capacity() - bigSize;
190        // Should we save this small buffer for the next big buffer?
191        // If the first small buffer did not have a timestamp then save
192        // any buffer that does have a timestamp until the next big buffer.
193        if ((smallSize > roomLeft)
194            || (!bigTimestampValid && (bigSize > 0) && smallTimestampValid)) {
195            mPendingAudioErr = OK;
196            mPendingAudioAccessUnit = accessUnit;
197            aggregate = mAggregateBuffer;
198            mAggregateBuffer.clear();
199        } else {
200            // Grab time from first small buffer if available.
201            if ((bigSize == 0) && smallTimestampValid) {
202                mAggregateBuffer->meta()->setInt64("timeUs", timeUs);
203            }
204            // Append small buffer to the bigger buffer.
205            memcpy(mAggregateBuffer->base() + bigSize, accessUnit->data(), smallSize);
206            bigSize += smallSize;
207            mAggregateBuffer->setRange(0, bigSize);
208
209            ALOGV("feedDecoderInputData() smallSize = %zu, bigSize = %zu, capacity = %zu",
210                    smallSize, bigSize, mAggregateBuffer->capacity());
211        }
212    } else {
213        // decided not to aggregate
214        aggregate = accessUnit;
215    }
216
217    return aggregate;
218}
219
220status_t NuPlayer::DecoderPassThrough::fetchInputData(sp<AMessage> &reply) {
221    sp<ABuffer> accessUnit;
222
223    do {
224        status_t err = dequeueAccessUnit(&accessUnit);
225
226        if (err == -EWOULDBLOCK) {
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                    onFlush(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    if (mSkipRenderingUntilMediaTimeUs >= 0) {
319        int64_t timeUs = 0;
320        CHECK(buffer->meta()->findInt64("timeUs", &timeUs));
321
322        if (timeUs < mSkipRenderingUntilMediaTimeUs) {
323            ALOGV("[%s] dropping buffer at time %lld as requested.",
324                     mComponentName.c_str(), (long long)timeUs);
325
326            onBufferConsumed(bufferSize);
327            return;
328        }
329
330        mSkipRenderingUntilMediaTimeUs = -1;
331    }
332
333    if (mRenderer == NULL) {
334        onBufferConsumed(bufferSize);
335        return;
336    }
337
338    sp<AMessage> reply = new AMessage(kWhatBufferConsumed, id());
339    reply->setInt32("generation", mBufferGeneration);
340    reply->setInt32("size", bufferSize);
341
342    mRenderer->queueBuffer(true /* audio */, buffer, reply);
343
344    ++mPendingBuffersToDrain;
345    ALOGV("onInputBufferFilled: #ToDrain = %zu, cachedBytes = %zu",
346            mPendingBuffersToDrain, mCachedBytes);
347}
348
349void NuPlayer::DecoderPassThrough::onBufferConsumed(int32_t size) {
350    --mPendingBuffersToDrain;
351    mCachedBytes -= size;
352    ALOGV("onBufferConsumed: #ToDrain = %zu, cachedBytes = %zu",
353            mPendingBuffersToDrain, mCachedBytes);
354    onRequestInputBuffers();
355}
356
357void NuPlayer::DecoderPassThrough::onResume() {
358    onRequestInputBuffers();
359}
360
361void NuPlayer::DecoderPassThrough::onFlush(bool notifyComplete) {
362    ++mBufferGeneration;
363    mSkipRenderingUntilMediaTimeUs = -1;
364
365    if (mRenderer != NULL) {
366        mRenderer->flush(true /* audio */, notifyComplete);
367        mRenderer->signalTimeDiscontinuity();
368    }
369
370    if (notifyComplete) {
371        sp<AMessage> notify = mNotify->dup();
372        notify->setInt32("what", kWhatFlushCompleted);
373        notify->post();
374    }
375
376    mPendingBuffersToDrain = 0;
377    mCachedBytes = 0;
378    mReachedEOS = false;
379}
380
381void NuPlayer::DecoderPassThrough::onShutdown(bool notifyComplete) {
382    ++mBufferGeneration;
383    mSkipRenderingUntilMediaTimeUs = -1;
384
385    if (notifyComplete) {
386        sp<AMessage> notify = mNotify->dup();
387        notify->setInt32("what", kWhatShutdownCompleted);
388        notify->post();
389    }
390
391    mReachedEOS = true;
392}
393
394void NuPlayer::DecoderPassThrough::onMessageReceived(const sp<AMessage> &msg) {
395    ALOGV("[%s] onMessage: %s", mComponentName.c_str(),
396            msg->debugString().c_str());
397
398    switch (msg->what()) {
399        case kWhatBufferConsumed:
400        {
401            if (!isStaleReply(msg)) {
402                int32_t size;
403                CHECK(msg->findInt32("size", &size));
404                onBufferConsumed(size);
405            }
406            break;
407        }
408
409        default:
410            DecoderBase::onMessageReceived(msg);
411            break;
412    }
413}
414
415}  // namespace android
416