android_AudioSfDecoder.h revision 0f92f48017588949daf7d24a339423e149bb2555 
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#ifndef AUDIO_SF_DECODER_H_
18#define AUDIO_SF_DECODER_H_
19
20#include <media/stagefright/DataSource.h>
21#include <media/stagefright/MediaSource.h>
22#include <media/stagefright/FileSource.h>
23#include <media/stagefright/MediaDefs.h>
24#include <media/stagefright/MediaExtractor.h>
25#include <media/stagefright/MetaData.h>
26#include <media/stagefright/OMXClient.h>
27#include <media/stagefright/OMXCodec.h>
28#include "NuCachedSource2.h"
29#include "ThrottledSource.h"
30
31#include "android_GenericPlayer.h"
32
33//--------------------------------------------------------------------------------------------------
34namespace android {
35
36// keep in sync with the entries of kPcmDecodeMetadataKeys[]
37#define ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS   0
38#define ANDROID_KEY_INDEX_PCMFORMAT_SAMPLERATE    1
39#define ANDROID_KEY_INDEX_PCMFORMAT_BITSPERSAMPLE 2
40#define ANDROID_KEY_INDEX_PCMFORMAT_CONTAINERSIZE 3
41#define ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK   4
42#define ANDROID_KEY_INDEX_PCMFORMAT_ENDIANNESS    5
43
44// to keep in sync with the ANDROID_KEY_INDEX_PCMFORMAT_* constants in android_AudioSfDecoder.cpp
45static const char* const kPcmDecodeMetadataKeys[] = {
46        ANDROID_KEY_PCMFORMAT_NUMCHANNELS, ANDROID_KEY_PCMFORMAT_SAMPLERATE,
47        ANDROID_KEY_PCMFORMAT_BITSPERSAMPLE, ANDROID_KEY_PCMFORMAT_CONTAINERSIZE,
48        ANDROID_KEY_PCMFORMAT_CHANNELMASK, ANDROID_KEY_PCMFORMAT_ENDIANNESS };
49#define NB_PCMMETADATA_KEYS (sizeof(kPcmDecodeMetadataKeys)/sizeof(kPcmDecodeMetadataKeys[0]))
50
51class AudioSfDecoder : public GenericPlayer
52{
53public:
54
55    AudioSfDecoder(const AudioPlayback_Parameters* params);
56    virtual ~AudioSfDecoder();
57
58    virtual void preDestroy();
59
60    // overridden from GenericPlayer
61    virtual void play();
62    virtual void getPositionMsec(int* msec); //msec != NULL, ANDROID_UNKNOWN_TIME if unknown
63
64    void startPrefetch_async();
65
66    uint32_t getPcmFormatKeyCount() const;
67    bool     getPcmFormatKeySize(uint32_t index, uint32_t* pKeySize);
68    bool     getPcmFormatKeyName(uint32_t index, uint32_t keySize, char* keyName);
69    bool     getPcmFormatValueSize(uint32_t index, uint32_t* pValueSize);
70    bool     getPcmFormatKeyValue(uint32_t index, uint32_t size, uint32_t* pValue);
71
72protected:
73
74    enum {
75        kWhatDecode       = 'deco',
76        kWhatRender       = 'rend',
77        kWhatCheckCache   = 'cach'
78    };
79
80    // Async event handlers (called from the AudioSfDecoder's event loop)
81    void onDecode();
82    void onCheckCache(const sp<AMessage> &msg);
83    virtual void onRender();
84
85    // Async event handlers (called from GenericPlayer's event loop)
86    virtual void onPrepare();
87    virtual void onPlay();
88    virtual void onPause();
89    virtual void onSeek(const sp<AMessage> &msg);
90    virtual void onLoop(const sp<AMessage> &msg);
91
92    // overridden from GenericPlayer
93    virtual void onNotify(const sp<AMessage> &msg);
94    virtual void onMessageReceived(const sp<AMessage> &msg);
95
96    // to be implemented by subclasses of AudioSfDecoder to do something with the audio samples
97    // (called from GenericPlayer's event loop)
98    virtual void createAudioSink() = 0;
99    virtual void updateAudioSink() = 0; // called with mBufferSourceLock held
100    virtual void startAudioSink() = 0;
101    virtual void pauseAudioSink() = 0;
102
103    sp<DataSource>  mDataSource; // where the raw data comes from
104    sp<MediaSource> mAudioSource;// the decoder reading from the data source
105    // used to indicate mAudioSource was successfully started, but wasn't stopped
106    bool            mAudioSourceStarted;
107
108    // negative values indicate invalid value
109    int64_t mBitrate;  // in bits/sec
110    uint32_t mChannelMask; // UNKNOWN_CHANNEL_MASK if unknown
111    int64_t mDurationUsec; // ANDROID_UNKNOWN_TIME if unknown
112
113    // buffer passed from decoder to renderer
114    MediaBuffer *mDecodeBuffer;
115
116    // mutex used to protect the decode buffer, the audio source and its running state
117    Mutex       mBufferSourceLock;
118
119    void notifyPrepared(status_t prepareRes);
120
121    int64_t mSeekTimeMsec;
122    int64_t mLastDecodedPositionUs; // ANDROID_UNKNOWN_TIME if unknown
123    // mutex used for seek flag, seek time (mSeekTimeMsec),
124    //   and last decoded position (mLastDecodedPositionUs)
125    Mutex mTimeLock;
126
127    // informations that can be retrieved in the PCM format queries
128    //  these values are only written in the event loop
129    uint32_t mPcmFormatValues[NB_PCMMETADATA_KEYS];
130    // protects mPcmFormatValues
131    Mutex    mPcmFormatLock;
132
133private:
134    bool wantPrefetch();
135    CacheStatus_t getCacheRemaining(bool *eos);
136    int64_t getPositionUsec(); // ANDROID_UNKNOWN_TIME if unknown
137
138    // convenience function to update internal state when decoding parameters have changed,
139    // called with a lock on mBufferSourceLock
140    void hasNewDecodeParams();
141
142private:
143    DISALLOW_EVIL_CONSTRUCTORS(AudioSfDecoder);
144
145};
146
147} // namespace android
148
149#endif // AUDIO_SF_DECODER_H_
150