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