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 __ANDROID_GENERICPLAYER_H__ 18 #define __ANDROID_GENERICPLAYER_H__ 19 20 #include <media/stagefright/foundation/AHandler.h> 21 #include <media/stagefright/foundation/ALooper.h> 22 #include <media/stagefright/foundation/AMessage.h> 23 24 //-------------------------------------------------------------------------------------------------- 25 /** 26 * Message parameters for AHandler messages, see list in GenericPlayer::kWhatxxx 27 */ 28 #define WHATPARAM_SEEK_SEEKTIME_MS "seekTimeMs" 29 #define WHATPARAM_LOOP_LOOPING "looping" 30 #define WHATPARAM_BUFFERING_UPDATE "bufferingUpdate" 31 #define WHATPARAM_BUFFERING_UPDATETHRESHOLD_PERCENT "buffUpdateThreshold" 32 #define WHATPARAM_ATTACHAUXEFFECT "attachAuxEffect" 33 #define WHATPARAM_SETAUXEFFECTSENDLEVEL "setAuxEffectSendLevel" 34 // Parameters for kWhatSetPlayEvents 35 #define WHATPARAM_SETPLAYEVENTS_FLAGS "setPlayEventsFlags" 36 #define WHATPARAM_SETPLAYEVENTS_MARKER "setPlayEventsMarker" 37 #define WHATPARAM_SETPLAYEVENTS_UPDATE "setPlayEventsUpdate" 38 // Parameters for kWhatOneShot (see explanation at definition of kWhatOneShot below) 39 #define WHATPARAM_ONESHOT_GENERATION "oneShotGeneration" 40 41 namespace android { 42 43 // abstract base class 44 class GenericPlayer : public AHandler 45 { 46 public: 47 48 enum { 49 kEventPrepared = 0, 50 kEventHasVideoSize = 1, 51 kEventPrefetchStatusChange = 2, 52 kEventPrefetchFillLevelUpdate = 3, 53 kEventEndOfStream = 4, 54 kEventChannelCount = 5, 55 kEventPlay = 6, // SL_PLAYEVENT_* 56 kEventErrorAfterPrepare = 7, // error after successful prepare 57 }; 58 59 60 GenericPlayer(const AudioPlayback_Parameters* params); 61 virtual ~GenericPlayer(); 62 63 void init(const notif_cbf_t cbf, void* notifUser); 64 virtual void preDestroy(); 65 66 void setDataSource(const char *uri); 67 void setDataSource(int fd, int64_t offset, int64_t length, bool closeAfterUse = false); 68 69 void prepare(); 70 virtual void play(); 71 void pause(); 72 void stop(); 73 // timeMsec must be >= 0 or == ANDROID_UNKNOWN_TIME (used by StreamPlayer after discontinuity) 74 void seek(int64_t timeMsec); 75 void loop(bool loop); 76 void setBufferingUpdateThreshold(int16_t thresholdPercent); 77 78 void getDurationMsec(int* msec); //msec != NULL, ANDROID_UNKNOWN_TIME if unknown 79 virtual void getPositionMsec(int* msec) = 0; //msec != NULL, ANDROID_UNKNOWN_TIME if unknown 80 81 virtual void setVideoSurfaceTexture(const sp<IGraphicBufferProducer> &bufferProducer __unused) 82 { } 83 84 void setVolume(float leftVol, float rightVol); 85 void attachAuxEffect(int32_t effectId); 86 void setAuxEffectSendLevel(float level); 87 88 virtual void setPlaybackRate(int32_t ratePermille); 89 90 // Call after changing any of the IPlay settings related to SL_PLAYEVENT_* 91 void setPlayEvents(int32_t eventFlags, int32_t markerPosition, int32_t positionUpdatePeriod); 92 93 protected: 94 // mutex used for set vs use of volume, duration, and cache (fill, threshold) settings 95 Mutex mSettingsLock; 96 97 void resetDataLocator(); 98 DataLocator2 mDataLocator; 99 int mDataLocatorType; 100 101 // Constants used to identify the messages in this player's AHandler message loop 102 // in onMessageReceived() 103 enum { 104 kWhatPrepare = 0, // start preparation 105 kWhatNotif = 1, // send a notification to client 106 kWhatPlay = 2, // start player 107 kWhatPause = 3, // pause or stop player 108 kWhatSeek = 4, // request a seek to specified position 109 kWhatSeekComplete = 5, // seek request has completed 110 kWhatLoop = 6, // set the player's looping status 111 kWhatVolumeUpdate = 7, // set the channel gains to specified values 112 kWhatBufferingUpdate = 8, 113 kWhatBuffUpdateThres = 9, 114 kWhatAttachAuxEffect = 10, 115 kWhatSetAuxEffectSendLevel = 11, 116 kWhatSetPlayEvents = 12, // process new IPlay settings related to SL_PLAYEVENT_* 117 kWhatOneShot = 13, // deferred (non-0 timeout) handler for SL_PLAYEVENT_* 118 // As used here, "one-shot" is the software equivalent of a "retriggerable monostable 119 // multivibrator" from electronics. Briefly, a one-shot is a timer that can be triggered 120 // to fire at some point in the future. It is "retriggerable" because while the timer 121 // is active, it is possible to replace the current timeout value by a new value. 122 // This is done by cancelling the current timer (using a generation count), 123 // and then posting another timer with the new desired value. 124 }; 125 126 // Send a notification to one of the event listeners 127 virtual void notify(const char* event, int data1, bool async); 128 virtual void notify(const char* event, int data1, int data2, bool async); 129 130 // AHandler implementation 131 virtual void onMessageReceived(const sp<AMessage> &msg); 132 133 // Async event handlers (called from GenericPlayer's event loop) 134 virtual void onPrepare(); 135 virtual void onNotify(const sp<AMessage> &msg); 136 virtual void onPlay(); 137 virtual void onPause(); 138 virtual void onSeek(const sp<AMessage> &msg); 139 virtual void onLoop(const sp<AMessage> &msg); 140 virtual void onVolumeUpdate(); 141 virtual void onSeekComplete(); 142 virtual void onBufferingUpdate(const sp<AMessage> &msg); 143 virtual void onSetBufferingUpdateThreshold(const sp<AMessage> &msg); 144 virtual void onAttachAuxEffect(const sp<AMessage> &msg); 145 virtual void onSetAuxEffectSendLevel(const sp<AMessage> &msg); 146 void onSetPlayEvents(const sp<AMessage> &msg); 147 void onOneShot(const sp<AMessage> &msg); 148 149 // Convenience methods 150 // for async notifications of prefetch status and cache fill level, needs to be called 151 // with mSettingsLock locked 152 void notifyStatus(); 153 void notifyCacheFill(); 154 // for internal async notification to update state that the player is no longer seeking 155 void seekComplete(); 156 void bufferingUpdate(int16_t fillLevelPerMille); 157 158 // Event notification from GenericPlayer to OpenSL ES / OpenMAX AL framework 159 notif_cbf_t mNotifyClient; 160 void* mNotifyUser; 161 // lock to protect mNotifyClient and mNotifyUser updates 162 Mutex mNotifyClientLock; 163 164 // Bits for mStateFlags 165 enum { 166 kFlagPrepared = 1 << 0, // use only for successful preparation 167 kFlagPreparing = 1 << 1, 168 kFlagPlaying = 1 << 2, 169 kFlagBuffering = 1 << 3, 170 kFlagSeeking = 1 << 4, // set if we (not Stagefright) initiated a seek 171 kFlagLooping = 1 << 5, // set if looping is enabled 172 kFlagPreparedUnsuccessfully = 1 << 6, 173 }; 174 175 // Only accessed from event loop, does not need a mutex 176 uint32_t mStateFlags; 177 178 sp<ALooper> mLooper; 179 180 const AudioPlayback_Parameters mPlaybackParams; 181 182 // protected by mSettingsLock after construction 183 AndroidAudioLevels mAndroidAudioLevels; 184 185 // protected by mSettingsLock 186 int32_t mDurationMsec; 187 int16_t mPlaybackRatePermille; 188 189 CacheStatus_t mCacheStatus; 190 int16_t mCacheFill; // cache fill level + played back level in permille 191 int16_t mLastNotifiedCacheFill; // last cache fill level communicated to the listener 192 int16_t mCacheFillNotifThreshold; // threshold in cache fill level for cache fill to be reported 193 194 // Call any time any of the IPlay copies, current position, or play state changes, and 195 // supply the latest known position or ANDROID_UNKNOWN_TIME if position is unknown to caller. 196 void updateOneShot(int positionMs = ANDROID_UNKNOWN_TIME); 197 198 // players that "render" data to present it to the user (a music player, a video player), 199 // should return true, while players that only decode (hopefully faster than "real time") 200 // should return false. 201 virtual bool advancesPositionInRealTime() const { return true; } 202 203 private: 204 205 // Our copy of some important IPlay member variables, except in Android units 206 int32_t mEventFlags; 207 int32_t mMarkerPositionMs; 208 int32_t mPositionUpdatePeriodMs; 209 210 // We need to be able to cancel any pending one-shot event(s) prior to posting 211 // a new one-shot. As AMessage does not currently support cancellation by 212 // "what" category, we simulate this by keeping a generation counter for 213 // one-shots. When a one-shot event is delivered, it checks to see if it is 214 // still the current one-shot. If not, it returns immediately, thus 215 // effectively cancelling itself. Note that counter wrap-around is possible 216 // but unlikely and benign. 217 int32_t mOneShotGeneration; 218 219 // Play position at time of the most recently delivered SL_PLAYEVENT_HEADATNEWPOS, 220 // or ANDROID_UNKNOWN_TIME if a SL_PLAYEVENT_HEADATNEWPOS has never been delivered. 221 int32_t mDeliveredNewPosMs; 222 223 // Play position most recently observed by updateOneShot, or ANDROID_UNKNOWN_TIME 224 // if the play position has never been observed. 225 int32_t mObservedPositionMs; 226 227 DISALLOW_EVIL_CONSTRUCTORS(GenericPlayer); 228 }; 229 230 } // namespace android 231 232 extern void android_player_volumeUpdate(float *pVolumes /*[2]*/, const IVolume *volumeItf, 233 unsigned channelCount, float amplFromDirectLevel, const bool *audibilityFactors /*[2]*/); 234 235 #endif /* __ANDROID_GENERICPLAYER_H__ */ 236
