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