AudioPlayer.cpp revision fce7a473248381cc83a01855f92581077d3c9ee2 
1/*
2 * Copyright (C) 2009 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 "AudioPlayer"
19#include <utils/Log.h>
20
21#include <binder/IPCThreadState.h>
22#include <media/AudioTrack.h>
23#include <media/stagefright/AudioPlayer.h>
24#include <media/stagefright/MediaDebug.h>
25#include <media/stagefright/MediaDefs.h>
26#include <media/stagefright/MediaErrors.h>
27#include <media/stagefright/MediaSource.h>
28#include <media/stagefright/MetaData.h>
29
30#include "include/AwesomePlayer.h"
31
32namespace android {
33
34AudioPlayer::AudioPlayer(
35        const sp<MediaPlayerBase::AudioSink> &audioSink,
36        AwesomePlayer *observer)
37    : mAudioTrack(NULL),
38      mInputBuffer(NULL),
39      mSampleRate(0),
40      mLatencyUs(0),
41      mFrameSize(0),
42      mNumFramesPlayed(0),
43      mPositionTimeMediaUs(-1),
44      mPositionTimeRealUs(-1),
45      mSeeking(false),
46      mReachedEOS(false),
47      mFinalStatus(OK),
48      mStarted(false),
49      mIsFirstBuffer(false),
50      mFirstBufferResult(OK),
51      mFirstBuffer(NULL),
52      mAudioSink(audioSink),
53      mObserver(observer) {
54}
55
56AudioPlayer::~AudioPlayer() {
57    if (mStarted) {
58        reset();
59    }
60}
61
62void AudioPlayer::setSource(const sp<MediaSource> &source) {
63    CHECK_EQ(mSource, NULL);
64    mSource = source;
65}
66
67status_t AudioPlayer::start(bool sourceAlreadyStarted) {
68    CHECK(!mStarted);
69    CHECK(mSource != NULL);
70
71    status_t err;
72    if (!sourceAlreadyStarted) {
73        err = mSource->start();
74
75        if (err != OK) {
76            return err;
77        }
78    }
79
80    // We allow an optional INFO_FORMAT_CHANGED at the very beginning
81    // of playback, if there is one, getFormat below will retrieve the
82    // updated format, if there isn't, we'll stash away the valid buffer
83    // of data to be used on the first audio callback.
84
85    CHECK(mFirstBuffer == NULL);
86
87    mFirstBufferResult = mSource->read(&mFirstBuffer);
88    if (mFirstBufferResult == INFO_FORMAT_CHANGED) {
89        LOGV("INFO_FORMAT_CHANGED!!!");
90
91        CHECK(mFirstBuffer == NULL);
92        mFirstBufferResult = OK;
93        mIsFirstBuffer = false;
94    } else {
95        mIsFirstBuffer = true;
96    }
97
98    sp<MetaData> format = mSource->getFormat();
99    const char *mime;
100    bool success = format->findCString(kKeyMIMEType, &mime);
101    CHECK(success);
102    CHECK(!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_RAW));
103
104    success = format->findInt32(kKeySampleRate, &mSampleRate);
105    CHECK(success);
106
107    int32_t numChannels;
108    success = format->findInt32(kKeyChannelCount, &numChannels);
109    CHECK(success);
110
111    if (mAudioSink.get() != NULL) {
112        status_t err = mAudioSink->open(
113                mSampleRate, numChannels, AUDIO_FORMAT_PCM_16_BIT,
114                DEFAULT_AUDIOSINK_BUFFERCOUNT,
115                &AudioPlayer::AudioSinkCallback, this);
116        if (err != OK) {
117            if (mFirstBuffer != NULL) {
118                mFirstBuffer->release();
119                mFirstBuffer = NULL;
120            }
121
122            if (!sourceAlreadyStarted) {
123                mSource->stop();
124            }
125
126            return err;
127        }
128
129        mLatencyUs = (int64_t)mAudioSink->latency() * 1000;
130        mFrameSize = mAudioSink->frameSize();
131
132        mAudioSink->start();
133    } else {
134        mAudioTrack = new AudioTrack(
135                AUDIO_STREAM_MUSIC, mSampleRate, AUDIO_FORMAT_PCM_16_BIT,
136                (numChannels == 2)
137                    ? AUDIO_CHANNEL_OUT_STEREO
138                    : AUDIO_CHANNEL_OUT_MONO,
139                0, 0, &AudioCallback, this, 0);
140
141        if ((err = mAudioTrack->initCheck()) != OK) {
142            delete mAudioTrack;
143            mAudioTrack = NULL;
144
145            if (mFirstBuffer != NULL) {
146                mFirstBuffer->release();
147                mFirstBuffer = NULL;
148            }
149
150            if (!sourceAlreadyStarted) {
151                mSource->stop();
152            }
153
154            return err;
155        }
156
157        mLatencyUs = (int64_t)mAudioTrack->latency() * 1000;
158        mFrameSize = mAudioTrack->frameSize();
159
160        mAudioTrack->start();
161    }
162
163    mStarted = true;
164
165    return OK;
166}
167
168void AudioPlayer::pause(bool playPendingSamples) {
169    CHECK(mStarted);
170
171    if (playPendingSamples) {
172        if (mAudioSink.get() != NULL) {
173            mAudioSink->stop();
174        } else {
175            mAudioTrack->stop();
176        }
177    } else {
178        if (mAudioSink.get() != NULL) {
179            mAudioSink->pause();
180        } else {
181            mAudioTrack->pause();
182        }
183    }
184}
185
186void AudioPlayer::resume() {
187    CHECK(mStarted);
188
189    if (mAudioSink.get() != NULL) {
190        mAudioSink->start();
191    } else {
192        mAudioTrack->start();
193    }
194}
195
196void AudioPlayer::reset() {
197    CHECK(mStarted);
198
199    if (mAudioSink.get() != NULL) {
200        mAudioSink->stop();
201        mAudioSink->close();
202    } else {
203        mAudioTrack->stop();
204
205        delete mAudioTrack;
206        mAudioTrack = NULL;
207    }
208
209    // Make sure to release any buffer we hold onto so that the
210    // source is able to stop().
211
212    if (mFirstBuffer != NULL) {
213        mFirstBuffer->release();
214        mFirstBuffer = NULL;
215    }
216
217    if (mInputBuffer != NULL) {
218        LOGV("AudioPlayer releasing input buffer.");
219
220        mInputBuffer->release();
221        mInputBuffer = NULL;
222    }
223
224    mSource->stop();
225
226    // The following hack is necessary to ensure that the OMX
227    // component is completely released by the time we may try
228    // to instantiate it again.
229    wp<MediaSource> tmp = mSource;
230    mSource.clear();
231    while (tmp.promote() != NULL) {
232        usleep(1000);
233    }
234    IPCThreadState::self()->flushCommands();
235
236    mNumFramesPlayed = 0;
237    mPositionTimeMediaUs = -1;
238    mPositionTimeRealUs = -1;
239    mSeeking = false;
240    mReachedEOS = false;
241    mFinalStatus = OK;
242    mStarted = false;
243}
244
245// static
246void AudioPlayer::AudioCallback(int event, void *user, void *info) {
247    static_cast<AudioPlayer *>(user)->AudioCallback(event, info);
248}
249
250bool AudioPlayer::isSeeking() {
251    Mutex::Autolock autoLock(mLock);
252    return mSeeking;
253}
254
255bool AudioPlayer::reachedEOS(status_t *finalStatus) {
256    *finalStatus = OK;
257
258    Mutex::Autolock autoLock(mLock);
259    *finalStatus = mFinalStatus;
260    return mReachedEOS;
261}
262
263// static
264size_t AudioPlayer::AudioSinkCallback(
265        MediaPlayerBase::AudioSink *audioSink,
266        void *buffer, size_t size, void *cookie) {
267    AudioPlayer *me = (AudioPlayer *)cookie;
268
269    return me->fillBuffer(buffer, size);
270}
271
272void AudioPlayer::AudioCallback(int event, void *info) {
273    if (event != AudioTrack::EVENT_MORE_DATA) {
274        return;
275    }
276
277    AudioTrack::Buffer *buffer = (AudioTrack::Buffer *)info;
278    size_t numBytesWritten = fillBuffer(buffer->raw, buffer->size);
279
280    buffer->size = numBytesWritten;
281}
282
283uint32_t AudioPlayer::getNumFramesPendingPlayout() const {
284    uint32_t numFramesPlayedOut;
285    status_t err;
286
287    if (mAudioSink != NULL) {
288        err = mAudioSink->getPosition(&numFramesPlayedOut);
289    } else {
290        err = mAudioTrack->getPosition(&numFramesPlayedOut);
291    }
292
293    if (err != OK || mNumFramesPlayed < numFramesPlayedOut) {
294        return 0;
295    }
296
297    // mNumFramesPlayed is the number of frames submitted
298    // to the audio sink for playback, but not all of them
299    // may have played out by now.
300    return mNumFramesPlayed - numFramesPlayedOut;
301}
302
303size_t AudioPlayer::fillBuffer(void *data, size_t size) {
304    if (mNumFramesPlayed == 0) {
305        LOGV("AudioCallback");
306    }
307
308    if (mReachedEOS) {
309        return 0;
310    }
311
312    bool postSeekComplete = false;
313    bool postEOS = false;
314    int64_t postEOSDelayUs = 0;
315
316    size_t size_done = 0;
317    size_t size_remaining = size;
318    while (size_remaining > 0) {
319        MediaSource::ReadOptions options;
320
321        {
322            Mutex::Autolock autoLock(mLock);
323
324            if (mSeeking) {
325                if (mIsFirstBuffer) {
326                    if (mFirstBuffer != NULL) {
327                        mFirstBuffer->release();
328                        mFirstBuffer = NULL;
329                    }
330                    mIsFirstBuffer = false;
331                }
332
333                options.setSeekTo(mSeekTimeUs);
334
335                if (mInputBuffer != NULL) {
336                    mInputBuffer->release();
337                    mInputBuffer = NULL;
338                }
339
340                mSeeking = false;
341                if (mObserver) {
342                    postSeekComplete = true;
343                }
344            }
345        }
346
347        if (mInputBuffer == NULL) {
348            status_t err;
349
350            if (mIsFirstBuffer) {
351                mInputBuffer = mFirstBuffer;
352                mFirstBuffer = NULL;
353                err = mFirstBufferResult;
354
355                mIsFirstBuffer = false;
356            } else {
357                err = mSource->read(&mInputBuffer, &options);
358            }
359
360            CHECK((err == OK && mInputBuffer != NULL)
361                   || (err != OK && mInputBuffer == NULL));
362
363            Mutex::Autolock autoLock(mLock);
364
365            if (err != OK) {
366                if (mObserver && !mReachedEOS) {
367                    // We don't want to post EOS right away but only
368                    // after all frames have actually been played out.
369
370                    // These are the number of frames submitted to the
371                    // AudioTrack that you haven't heard yet.
372                    uint32_t numFramesPendingPlayout =
373                        getNumFramesPendingPlayout();
374
375                    // These are the number of frames we're going to
376                    // submit to the AudioTrack by returning from this
377                    // callback.
378                    uint32_t numAdditionalFrames = size_done / mFrameSize;
379
380                    numFramesPendingPlayout += numAdditionalFrames;
381
382                    int64_t timeToCompletionUs =
383                        (1000000ll * numFramesPendingPlayout) / mSampleRate;
384
385                    LOGV("total number of frames played: %lld (%lld us)",
386                            (mNumFramesPlayed + numAdditionalFrames),
387                            1000000ll * (mNumFramesPlayed + numAdditionalFrames)
388                                / mSampleRate);
389
390                    LOGV("%d frames left to play, %lld us (%.2f secs)",
391                         numFramesPendingPlayout,
392                         timeToCompletionUs, timeToCompletionUs / 1E6);
393
394                    postEOS = true;
395                    postEOSDelayUs = timeToCompletionUs + mLatencyUs;
396                }
397
398                mReachedEOS = true;
399                mFinalStatus = err;
400                break;
401            }
402
403            CHECK(mInputBuffer->meta_data()->findInt64(
404                        kKeyTime, &mPositionTimeMediaUs));
405
406            mPositionTimeRealUs =
407                ((mNumFramesPlayed + size_done / mFrameSize) * 1000000)
408                    / mSampleRate;
409
410            LOGV("buffer->size() = %d, "
411                 "mPositionTimeMediaUs=%.2f mPositionTimeRealUs=%.2f",
412                 mInputBuffer->range_length(),
413                 mPositionTimeMediaUs / 1E6, mPositionTimeRealUs / 1E6);
414        }
415
416        if (mInputBuffer->range_length() == 0) {
417            mInputBuffer->release();
418            mInputBuffer = NULL;
419
420            continue;
421        }
422
423        size_t copy = size_remaining;
424        if (copy > mInputBuffer->range_length()) {
425            copy = mInputBuffer->range_length();
426        }
427
428        memcpy((char *)data + size_done,
429               (const char *)mInputBuffer->data() + mInputBuffer->range_offset(),
430               copy);
431
432        mInputBuffer->set_range(mInputBuffer->range_offset() + copy,
433                                mInputBuffer->range_length() - copy);
434
435        size_done += copy;
436        size_remaining -= copy;
437    }
438
439    {
440        Mutex::Autolock autoLock(mLock);
441        mNumFramesPlayed += size_done / mFrameSize;
442    }
443
444    if (postEOS) {
445        mObserver->postAudioEOS(postEOSDelayUs);
446    }
447
448    if (postSeekComplete) {
449        mObserver->postAudioSeekComplete();
450    }
451
452    return size_done;
453}
454
455int64_t AudioPlayer::getRealTimeUs() {
456    Mutex::Autolock autoLock(mLock);
457    return getRealTimeUsLocked();
458}
459
460int64_t AudioPlayer::getRealTimeUsLocked() const {
461    return -mLatencyUs + (mNumFramesPlayed * 1000000) / mSampleRate;
462}
463
464int64_t AudioPlayer::getMediaTimeUs() {
465    Mutex::Autolock autoLock(mLock);
466
467    if (mPositionTimeMediaUs < 0 || mPositionTimeRealUs < 0) {
468        if (mSeeking) {
469            return mSeekTimeUs;
470        }
471
472        return 0;
473    }
474
475    int64_t realTimeOffset = getRealTimeUsLocked() - mPositionTimeRealUs;
476    if (realTimeOffset < 0) {
477        realTimeOffset = 0;
478    }
479
480    return mPositionTimeMediaUs + realTimeOffset;
481}
482
483bool AudioPlayer::getMediaTimeMapping(
484        int64_t *realtime_us, int64_t *mediatime_us) {
485    Mutex::Autolock autoLock(mLock);
486
487    *realtime_us = mPositionTimeRealUs;
488    *mediatime_us = mPositionTimeMediaUs;
489
490    return mPositionTimeRealUs != -1 && mPositionTimeMediaUs != -1;
491}
492
493status_t AudioPlayer::seekTo(int64_t time_us) {
494    Mutex::Autolock autoLock(mLock);
495
496    mSeeking = true;
497    mPositionTimeRealUs = mPositionTimeMediaUs = -1;
498    mReachedEOS = false;
499    mSeekTimeUs = time_us;
500
501    if (mAudioSink != NULL) {
502        mAudioSink->flush();
503    } else {
504        mAudioTrack->flush();
505    }
506
507    return OK;
508}
509
510}
511