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/stagefright/MediaSource.h> 22 23 #include "android_GenericPlayer.h" 24 25 //-------------------------------------------------------------------------------------------------- 26 namespace android { 27 28 // keep in sync with the entries of kPcmDecodeMetadataKeys[] 29 #define ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS 0 30 #define ANDROID_KEY_INDEX_PCMFORMAT_SAMPLERATE 1 31 #define ANDROID_KEY_INDEX_PCMFORMAT_BITSPERSAMPLE 2 32 #define ANDROID_KEY_INDEX_PCMFORMAT_CONTAINERSIZE 3 33 #define ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK 4 34 #define ANDROID_KEY_INDEX_PCMFORMAT_ENDIANNESS 5 35 36 // to keep in sync with the ANDROID_KEY_INDEX_PCMFORMAT_* constants in android_AudioSfDecoder.cpp 37 static const char* const kPcmDecodeMetadataKeys[] = { 38 ANDROID_KEY_PCMFORMAT_NUMCHANNELS, ANDROID_KEY_PCMFORMAT_SAMPLERATE, 39 ANDROID_KEY_PCMFORMAT_BITSPERSAMPLE, ANDROID_KEY_PCMFORMAT_CONTAINERSIZE, 40 ANDROID_KEY_PCMFORMAT_CHANNELMASK, ANDROID_KEY_PCMFORMAT_ENDIANNESS }; 41 #define NB_PCMMETADATA_KEYS (sizeof(kPcmDecodeMetadataKeys)/sizeof(kPcmDecodeMetadataKeys[0])) 42 43 // abstract base class for AudioToCbRenderer and it's subclasses 44 class AudioSfDecoder : public GenericPlayer 45 { 46 public: 47 48 explicit AudioSfDecoder(const AudioPlayback_Parameters* params); 49 virtual ~AudioSfDecoder(); 50 51 virtual void preDestroy(); 52 53 // overridden from GenericPlayer 54 virtual void play(); 55 virtual void getPositionMsec(int* msec); //msec != NULL, ANDROID_UNKNOWN_TIME if unknown 56 57 uint32_t getPcmFormatKeyCount() const; 58 bool getPcmFormatKeySize(uint32_t index, uint32_t* pKeySize); 59 bool getPcmFormatKeyName(uint32_t index, uint32_t keySize, char* keyName); 60 bool getPcmFormatValueSize(uint32_t index, uint32_t* pValueSize); 61 bool getPcmFormatKeyValue(uint32_t index, uint32_t size, uint32_t* pValue); 62 63 protected: 64 65 enum { 66 kWhatDecode = 'deco', 67 kWhatRender = 'rend', 68 kWhatCheckCache = 'cach' 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() = 0; 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 83 // overridden from GenericPlayer 84 virtual void onNotify(const sp<AMessage> &msg); 85 virtual void onMessageReceived(const sp<AMessage> &msg); 86 87 // to be implemented by subclasses of AudioSfDecoder to do something with the audio samples 88 // (called from GenericPlayer's event loop) 89 virtual void createAudioSink() = 0; 90 virtual void updateAudioSink() = 0; // called with mBufferSourceLock held 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 int64_t mDurationUsec; // ANDROID_UNKNOWN_TIME if unknown 102 103 // buffer passed from decoder to renderer 104 MediaBufferBase *mDecodeBuffer; 105 106 // mutex used to protect the decode buffer, the audio source and its running state 107 Mutex mBufferSourceLock; 108 109 void notifyPrepared(status_t prepareRes); 110 111 int64_t mSeekTimeMsec; 112 int64_t mLastDecodedPositionUs; // ANDROID_UNKNOWN_TIME if unknown 113 // mutex used for seek flag, seek time (mSeekTimeMsec), 114 // and last decoded position (mLastDecodedPositionUs) 115 Mutex mTimeLock; 116 117 // informations that can be retrieved in the PCM format queries 118 // these values are only written in the event loop 119 uint32_t mPcmFormatValues[NB_PCMMETADATA_KEYS]; 120 // protects mPcmFormatValues 121 Mutex mPcmFormatLock; 122 advancesPositionInRealTime()123 virtual bool advancesPositionInRealTime() const { return false; } 124 125 private: 126 bool wantPrefetch(); 127 CacheStatus_t getCacheRemaining(bool *eos); 128 int64_t getPositionUsec(); // ANDROID_UNKNOWN_TIME if unknown 129 130 // convenience function to update internal state when decoding parameters have changed, 131 // called with a lock on mBufferSourceLock 132 void hasNewDecodeParams(); 133 134 static bool isSupportedCodec(const char* mime); 135 136 private: 137 DISALLOW_EVIL_CONSTRUCTORS(AudioSfDecoder); 138 139 }; 140 141 } // namespace android 142 143 #endif // AUDIO_SF_DECODER_H_ 144