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      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 #ifndef AUDIO_PLAYER_H_
     18 
     19 #define AUDIO_PLAYER_H_
     20 
     21 #include <media/MediaPlayerInterface.h>
     22 #include <media/stagefright/MediaBuffer.h>
     23 #include <media/stagefright/TimeSource.h>
     24 #include <utils/threads.h>
     25 
     26 namespace android {
     27 
     28 class MediaSource;
     29 class AudioTrack;
     30 class AwesomePlayer;
     31 
     32 class AudioPlayer : public TimeSource {
     33 public:
     34     enum {
     35         REACHED_EOS,
     36         SEEK_COMPLETE
     37     };
     38 
     39     enum {
     40         ALLOW_DEEP_BUFFERING = 0x01,
     41         USE_OFFLOAD = 0x02,
     42         HAS_VIDEO   = 0x1000,
     43         IS_STREAMING = 0x2000
     44 
     45     };
     46 
     47     AudioPlayer(const sp<MediaPlayerBase::AudioSink> &audioSink,
     48                 uint32_t flags = 0,
     49                 AwesomePlayer *audioObserver = NULL);
     50 
     51     virtual ~AudioPlayer();
     52 
     53     // Caller retains ownership of "source".
     54     void setSource(const sp<MediaSource> &source);
     55 
     56     // Return time in us.
     57     virtual int64_t getRealTimeUs();
     58 
     59     status_t start(bool sourceAlreadyStarted = false);
     60 
     61     void pause(bool playPendingSamples = false);
     62     status_t resume();
     63 
     64     // Returns the timestamp of the last buffer played (in us).
     65     int64_t getMediaTimeUs();
     66 
     67     // Returns true iff a mapping is established, i.e. the AudioPlayer
     68     // has played at least one frame of audio.
     69     bool getMediaTimeMapping(int64_t *realtime_us, int64_t *mediatime_us);
     70 
     71     status_t seekTo(int64_t time_us);
     72 
     73     bool isSeeking();
     74     bool reachedEOS(status_t *finalStatus);
     75 
     76     status_t setPlaybackRatePermille(int32_t ratePermille);
     77 
     78     void notifyAudioEOS();
     79 
     80 private:
     81     friend class VideoEditorAudioPlayer;
     82     sp<MediaSource> mSource;
     83     sp<AudioTrack> mAudioTrack;
     84 
     85     MediaBuffer *mInputBuffer;
     86 
     87     int mSampleRate;
     88     int64_t mLatencyUs;
     89     size_t mFrameSize;
     90 
     91     Mutex mLock;
     92     int64_t mNumFramesPlayed;
     93     int64_t mNumFramesPlayedSysTimeUs;
     94 
     95     int64_t mPositionTimeMediaUs;
     96     int64_t mPositionTimeRealUs;
     97 
     98     bool mSeeking;
     99     bool mReachedEOS;
    100     status_t mFinalStatus;
    101     int64_t mSeekTimeUs;
    102 
    103     bool mStarted;
    104 
    105     bool mIsFirstBuffer;
    106     status_t mFirstBufferResult;
    107     MediaBuffer *mFirstBuffer;
    108 
    109     sp<MediaPlayerBase::AudioSink> mAudioSink;
    110     AwesomePlayer *mObserver;
    111     int64_t mPinnedTimeUs;
    112 
    113     bool mPlaying;
    114     int64_t mStartPosUs;
    115     const uint32_t mCreateFlags;
    116 
    117     static void AudioCallback(int event, void *user, void *info);
    118     void AudioCallback(int event, void *info);
    119 
    120     static size_t AudioSinkCallback(
    121             MediaPlayerBase::AudioSink *audioSink,
    122             void *data, size_t size, void *me,
    123             MediaPlayerBase::AudioSink::cb_event_t event);
    124 
    125     size_t fillBuffer(void *data, size_t size);
    126 
    127     int64_t getRealTimeUsLocked() const;
    128 
    129     void reset();
    130 
    131     uint32_t getNumFramesPendingPlayout() const;
    132     int64_t getOutputPlayPositionUs_l();
    133 
    134     bool allowDeepBuffering() const { return (mCreateFlags & ALLOW_DEEP_BUFFERING) != 0; }
    135     bool useOffload() const { return (mCreateFlags & USE_OFFLOAD) != 0; }
    136 
    137     AudioPlayer(const AudioPlayer &);
    138     AudioPlayer &operator=(const AudioPlayer &);
    139 };
    140 
    141 }  // namespace android
    142 
    143 #endif  // AUDIO_PLAYER_H_
    144