android_AudioSfDecoder.h revision e6ded5c61944a87fa9e472dec3a6929855d42aeb 
1/*
2 * Copyright (C) 2011 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#include <media/stagefright/DataSource.h>
18#include <media/stagefright/MediaSource.h>
19#include <media/stagefright/FileSource.h>
20#include <media/stagefright/MediaDefs.h>
21#include <media/stagefright/MediaExtractor.h>
22#include <media/stagefright/MetaData.h>
23#include <media/stagefright/OMXClient.h>
24#include <media/stagefright/OMXCodec.h>
25#include "NuCachedSource2.h"
26#include "NuHTTPDataSource.h"
27#include "ThrottledSource.h"
28
29#include "android_GenericPlayer.h"
30#include "OpenSLES_AndroidMetadata.h"
31
32//--------------------------------------------------------------------------------------------------
33namespace android {
34
35// to keep in sync with the ANDROID_KEY_INDEX_PCMFORMAT_* constants in android_AudioSfDecoder.cpp
36static const char* const kPcmDecodeMetadataKeys[] = {
37        ANDROID_KEY_PCMFORMAT_NUMCHANNELS, ANDROID_KEY_PCMFORMAT_SAMPLESPERSEC,
38        ANDROID_KEY_PCMFORMAT_BITSPERSAMPLE, ANDROID_KEY_PCMFORMAT_CONTAINERSIZE,
39        ANDROID_KEY_PCMFORMAT_CHANNELMASK, ANDROID_KEY_PCMFORMAT_ENDIANNESS };
40#define NB_PCMMETADATA_KEYS (sizeof(kPcmDecodeMetadataKeys)/sizeof(kPcmDecodeMetadataKeys[0]))
41
42class AudioSfDecoder : public GenericPlayer
43{
44public:
45
46    AudioSfDecoder(const AudioPlayback_Parameters* params);
47    virtual ~AudioSfDecoder();
48
49    virtual void preDestroy();
50
51    // overridden from GenericPlayer
52    virtual void play();
53
54    void startPrefetch_async();
55
56    uint32_t getPcmFormatKeyCount();
57    bool     getPcmFormatKeySize(uint32_t index, uint32_t* pKeySize);
58    bool     getPcmFormatKeyName(uint32_t index, uint32_t keySize, char* keyName);
59    bool     getPcmFormatValueSize(uint32_t index, uint32_t* pValueSize);
60    bool     getPcmFormatKeyValue(uint32_t index, uint32_t size, uint32_t* pValue);
61
62protected:
63
64    enum {
65        kWhatDecode       = 'deco',
66        kWhatRender       = 'rend',
67        kWhatCheckCache   = 'cach',
68        kWhatGetPcmFormat = 'gpcm'
69    };
70
71    // Async event handlers (called from the AudioSfDecoder's event loop)
72    void onDecode();
73    void onCheckCache(const sp<AMessage> &msg);
74    virtual void onRender();
75
76    // Async event handlers (called from GenericPlayer's event loop)
77    virtual void onPrepare();
78    virtual void onPlay();
79    virtual void onPause();
80    virtual void onSeek(const sp<AMessage> &msg);
81    virtual void onLoop(const sp<AMessage> &msg);
82    virtual void onGetPcmFormatKeyCount();
83
84    // overridden from GenericPlayer
85    virtual void onNotify(const sp<AMessage> &msg);
86    virtual void onMessageReceived(const sp<AMessage> &msg);
87
88    // to be implemented by subclasses of AudioSfDecoder to do something with the audio samples
89    virtual void createAudioSink() = 0;
90    virtual void updateAudioSink() = 0;
91    virtual void startAudioSink() = 0;
92    virtual void pauseAudioSink() = 0;
93
94    sp<DataSource>  mDataSource; // where the raw data comes from
95    sp<MediaSource> mAudioSource;// the decoder reading from the data source
96    // used to indicate mAudioSource was successfully started, but wasn't stopped
97    bool            mAudioSourceStarted;
98
99    // negative values indicate invalid value
100    int64_t mBitrate;  // in bits/sec
101    uint32_t mChannelMask;
102    int64_t mDurationUsec;
103
104    // buffer passed from decoder to renderer
105    MediaBuffer *mDecodeBuffer;
106
107    // mutex used to protect the decode buffer, the audio source and its running state
108    Mutex       mBufferSourceLock;
109
110private:
111
112    void notifyPrepared(status_t prepareRes);
113
114    int64_t mTimeDelta;
115    int64_t mSeekTimeMsec;
116    int64_t mLastDecodedPositionUs;
117
118    // mutex used for seek flag and seek time read/write
119    Mutex mSeekLock;
120
121    // informations that can be retrieved in the PCM format queries
122    //  these values are only written in the event loop
123    uint32_t mPcmFormatKeyCount;
124    uint32_t mPcmFormatValues[NB_PCMMETADATA_KEYS];
125    // for synchronous "get" calls on the PCM decode format:
126    //    prevents concurrent "getPcmFormat" calls
127    Mutex       mGetPcmFormatLockSingleton;
128    //    lock order 1/ mGetPcmFormatLockSingleton  2/ mGetPcmFormatLock
129    Mutex       mGetPcmFormatLock;
130    Condition   mGetPcmFormatCondition;
131    bool        mGetPcmFormatKeyCount;
132
133    bool wantPrefetch();
134    CacheStatus_t getCacheRemaining(bool *eos);
135    int64_t getPositionUsec();
136
137private:
138    DISALLOW_EVIL_CONSTRUCTORS(AudioSfDecoder);
139
140};
141
142} // namespace android
143