AudioPlayer.cpp revision ed54ad0f8619ae416b0968ade6248894cbfc4dba 
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        stop();
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, AudioSystem::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                AudioSystem::MUSIC, mSampleRate, AudioSystem::PCM_16_BIT,
136                (numChannels == 2)
137                    ? AudioSystem::CHANNEL_OUT_STEREO
138                    : AudioSystem::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() {
169    CHECK(mStarted);
170
171    if (mAudioSink.get() != NULL) {
172        mAudioSink->pause();
173    } else {
174        mAudioTrack->stop();
175    }
176}
177
178void AudioPlayer::resume() {
179    CHECK(mStarted);
180
181    if (mAudioSink.get() != NULL) {
182        mAudioSink->start();
183    } else {
184        mAudioTrack->start();
185    }
186}
187
188void AudioPlayer::stop() {
189    CHECK(mStarted);
190
191    if (mAudioSink.get() != NULL) {
192        mAudioSink->stop();
193        mAudioSink->close();
194    } else {
195        mAudioTrack->stop();
196
197        delete mAudioTrack;
198        mAudioTrack = NULL;
199    }
200
201    // Make sure to release any buffer we hold onto so that the
202    // source is able to stop().
203
204    if (mFirstBuffer != NULL) {
205        mFirstBuffer->release();
206        mFirstBuffer = NULL;
207    }
208
209    if (mInputBuffer != NULL) {
210        LOGV("AudioPlayer releasing input buffer.");
211
212        mInputBuffer->release();
213        mInputBuffer = NULL;
214    }
215
216    mSource->stop();
217
218    // The following hack is necessary to ensure that the OMX
219    // component is completely released by the time we may try
220    // to instantiate it again.
221    wp<MediaSource> tmp = mSource;
222    mSource.clear();
223    while (tmp.promote() != NULL) {
224        usleep(1000);
225    }
226    IPCThreadState::self()->flushCommands();
227
228    mNumFramesPlayed = 0;
229    mPositionTimeMediaUs = -1;
230    mPositionTimeRealUs = -1;
231    mSeeking = false;
232    mReachedEOS = false;
233    mFinalStatus = OK;
234    mStarted = false;
235}
236
237// static
238void AudioPlayer::AudioCallback(int event, void *user, void *info) {
239    static_cast<AudioPlayer *>(user)->AudioCallback(event, info);
240}
241
242bool AudioPlayer::isSeeking() {
243    Mutex::Autolock autoLock(mLock);
244    return mSeeking;
245}
246
247bool AudioPlayer::reachedEOS(status_t *finalStatus) {
248    *finalStatus = OK;
249
250    Mutex::Autolock autoLock(mLock);
251    *finalStatus = mFinalStatus;
252    return mReachedEOS;
253}
254
255// static
256size_t AudioPlayer::AudioSinkCallback(
257        MediaPlayerBase::AudioSink *audioSink,
258        void *buffer, size_t size, void *cookie) {
259    AudioPlayer *me = (AudioPlayer *)cookie;
260
261    return me->fillBuffer(buffer, size);
262}
263
264void AudioPlayer::AudioCallback(int event, void *info) {
265    if (event != AudioTrack::EVENT_MORE_DATA) {
266        return;
267    }
268
269    AudioTrack::Buffer *buffer = (AudioTrack::Buffer *)info;
270    size_t numBytesWritten = fillBuffer(buffer->raw, buffer->size);
271
272    buffer->size = numBytesWritten;
273}
274
275size_t AudioPlayer::fillBuffer(void *data, size_t size) {
276    if (mNumFramesPlayed == 0) {
277        LOGV("AudioCallback");
278    }
279
280    if (mReachedEOS) {
281        return 0;
282    }
283
284    size_t size_done = 0;
285    size_t size_remaining = size;
286    while (size_remaining > 0) {
287        MediaSource::ReadOptions options;
288
289        {
290            Mutex::Autolock autoLock(mLock);
291
292            if (mSeeking) {
293                if (mIsFirstBuffer) {
294                    if (mFirstBuffer != NULL) {
295                        mFirstBuffer->release();
296                        mFirstBuffer = NULL;
297                    }
298                    mIsFirstBuffer = false;
299                }
300
301                options.setSeekTo(mSeekTimeUs);
302
303                if (mInputBuffer != NULL) {
304                    mInputBuffer->release();
305                    mInputBuffer = NULL;
306                }
307
308                mSeeking = false;
309                if (mObserver) {
310                    mObserver->postAudioSeekComplete();
311                }
312            }
313        }
314
315        if (mInputBuffer == NULL) {
316            status_t err;
317
318            if (mIsFirstBuffer) {
319                mInputBuffer = mFirstBuffer;
320                mFirstBuffer = NULL;
321                err = mFirstBufferResult;
322
323                mIsFirstBuffer = false;
324            } else {
325                err = mSource->read(&mInputBuffer, &options);
326            }
327
328            CHECK((err == OK && mInputBuffer != NULL)
329                   || (err != OK && mInputBuffer == NULL));
330
331            Mutex::Autolock autoLock(mLock);
332
333            if (err != OK) {
334                if (mObserver && !mReachedEOS) {
335                    mObserver->postAudioEOS();
336                }
337
338                mReachedEOS = true;
339                mFinalStatus = err;
340                break;
341            }
342
343            CHECK(mInputBuffer->meta_data()->findInt64(
344                        kKeyTime, &mPositionTimeMediaUs));
345
346            mPositionTimeRealUs =
347                ((mNumFramesPlayed + size_done / mFrameSize) * 1000000)
348                    / mSampleRate;
349
350            LOGV("buffer->size() = %d, "
351                 "mPositionTimeMediaUs=%.2f mPositionTimeRealUs=%.2f",
352                 mInputBuffer->range_length(),
353                 mPositionTimeMediaUs / 1E6, mPositionTimeRealUs / 1E6);
354        }
355
356        if (mInputBuffer->range_length() == 0) {
357            mInputBuffer->release();
358            mInputBuffer = NULL;
359
360            continue;
361        }
362
363        size_t copy = size_remaining;
364        if (copy > mInputBuffer->range_length()) {
365            copy = mInputBuffer->range_length();
366        }
367
368        memcpy((char *)data + size_done,
369               (const char *)mInputBuffer->data() + mInputBuffer->range_offset(),
370               copy);
371
372        mInputBuffer->set_range(mInputBuffer->range_offset() + copy,
373                                mInputBuffer->range_length() - copy);
374
375        size_done += copy;
376        size_remaining -= copy;
377    }
378
379    Mutex::Autolock autoLock(mLock);
380    mNumFramesPlayed += size_done / mFrameSize;
381
382    return size_done;
383}
384
385int64_t AudioPlayer::getRealTimeUs() {
386    Mutex::Autolock autoLock(mLock);
387    return getRealTimeUsLocked();
388}
389
390int64_t AudioPlayer::getRealTimeUsLocked() const {
391    return -mLatencyUs + (mNumFramesPlayed * 1000000) / mSampleRate;
392}
393
394int64_t AudioPlayer::getMediaTimeUs() {
395    Mutex::Autolock autoLock(mLock);
396
397    if (mPositionTimeMediaUs < 0 || mPositionTimeRealUs < 0) {
398        return 0;
399    }
400
401    int64_t realTimeOffset = getRealTimeUsLocked() - mPositionTimeRealUs;
402    if (realTimeOffset < 0) {
403        realTimeOffset = 0;
404    }
405
406    return mPositionTimeMediaUs + realTimeOffset;
407}
408
409bool AudioPlayer::getMediaTimeMapping(
410        int64_t *realtime_us, int64_t *mediatime_us) {
411    Mutex::Autolock autoLock(mLock);
412
413    *realtime_us = mPositionTimeRealUs;
414    *mediatime_us = mPositionTimeMediaUs;
415
416    return mPositionTimeRealUs != -1 && mPositionTimeMediaUs != -1;
417}
418
419status_t AudioPlayer::seekTo(int64_t time_us) {
420    Mutex::Autolock autoLock(mLock);
421
422    mSeeking = true;
423    mReachedEOS = false;
424    mSeekTimeUs = time_us;
425
426    return OK;
427}
428
429}
430