android_AudioSfDecoder.h revision 54cad4f35a090a06e655fcc9e072e1d38f9e7689 
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 "ThrottledSource.h"
27
28#include "android_GenericPlayer.h"
29#include "OpenSLES_AndroidMetadata.h"
30
31//--------------------------------------------------------------------------------------------------
32namespace android {
33
34// to keep in sync with the ANDROID_KEY_INDEX_PCMFORMAT_* constants in android_AudioSfDecoder.cpp
35static const char* const kPcmDecodeMetadataKeys[] = {
36        ANDROID_KEY_PCMFORMAT_NUMCHANNELS, ANDROID_KEY_PCMFORMAT_SAMPLESPERSEC,
37        ANDROID_KEY_PCMFORMAT_BITSPERSAMPLE, ANDROID_KEY_PCMFORMAT_CONTAINERSIZE,
38        ANDROID_KEY_PCMFORMAT_CHANNELMASK, ANDROID_KEY_PCMFORMAT_ENDIANNESS };
39#define NB_PCMMETADATA_KEYS (sizeof(kPcmDecodeMetadataKeys)/sizeof(kPcmDecodeMetadataKeys[0]))
40
41class AudioSfDecoder : public GenericPlayer
42{
43public:
44
45    AudioSfDecoder(const AudioPlayback_Parameters* params);
46    virtual ~AudioSfDecoder();
47
48    virtual void preDestroy();
49
50    // overridden from GenericPlayer
51    virtual void play();
52
53    void startPrefetch_async();
54
55    uint32_t getPcmFormatKeyCount();
56    bool     getPcmFormatKeySize(uint32_t index, uint32_t* pKeySize);
57    bool     getPcmFormatKeyName(uint32_t index, uint32_t keySize, char* keyName);
58    bool     getPcmFormatValueSize(uint32_t index, uint32_t* pValueSize);
59    bool     getPcmFormatKeyValue(uint32_t index, uint32_t size, uint32_t* pValue);
60
61protected:
62
63    enum {
64        kWhatDecode       = 'deco',
65        kWhatRender       = 'rend',
66        kWhatCheckCache   = 'cach'
67    };
68
69    // Async event handlers (called from the AudioSfDecoder's event loop)
70    void onDecode();
71    void onCheckCache(const sp<AMessage> &msg);
72    virtual void onRender();
73
74    // Async event handlers (called from GenericPlayer's event loop)
75    virtual void onPrepare();
76    virtual void onPlay();
77    virtual void onPause();
78    virtual void onSeek(const sp<AMessage> &msg);
79    virtual void onLoop(const sp<AMessage> &msg);
80
81    // overridden from GenericPlayer
82    virtual void onNotify(const sp<AMessage> &msg);
83    virtual void onMessageReceived(const sp<AMessage> &msg);
84
85    // to be implemented by subclasses of AudioSfDecoder to do something with the audio samples
86    // (called from GenericPlayer's event loop)
87    virtual void createAudioSink() = 0;
88    virtual void updateAudioSink() = 0; // called with mBufferSourceLock held
89    virtual void startAudioSink() = 0;
90    virtual void pauseAudioSink() = 0;
91
92    sp<DataSource>  mDataSource; // where the raw data comes from
93    sp<MediaSource> mAudioSource;// the decoder reading from the data source
94    // used to indicate mAudioSource was successfully started, but wasn't stopped
95    bool            mAudioSourceStarted;
96
97    // negative values indicate invalid value
98    int64_t mBitrate;  // in bits/sec
99    uint32_t mChannelMask;
100    int64_t mDurationUsec;
101
102    // buffer passed from decoder to renderer
103    MediaBuffer *mDecodeBuffer;
104
105    // mutex used to protect the decode buffer, the audio source and its running state
106    Mutex       mBufferSourceLock;
107
108private:
109
110    void notifyPrepared(status_t prepareRes);
111
112    int64_t mTimeDelta;
113    int64_t mSeekTimeMsec;
114    int64_t mLastDecodedPositionUs;
115
116    // mutex used for seek flag and seek time read/write
117    Mutex mSeekLock;
118
119    // informations that can be retrieved in the PCM format queries
120    //  these values are only written in the event loop
121    uint32_t mPcmFormatKeyCount;
122    uint32_t mPcmFormatValues[NB_PCMMETADATA_KEYS];
123    // protects mPcmFormatKeyCount and mPcmFormatValues
124    Mutex    mPcmFormatLock;
125
126    bool wantPrefetch();
127    CacheStatus_t getCacheRemaining(bool *eos);
128    int64_t getPositionUsec();
129
130    // convenience function to update internal state when decoding parameters have changed,
131    // called with a lock on mBufferSourceLock
132    void hasNewDecodeParams();
133
134private:
135    DISALLOW_EVIL_CONSTRUCTORS(AudioSfDecoder);
136
137};
138
139} // namespace android
140