1 /* 2 * Copyright (C) 2010 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/IStreamSource.h> 18 #include <binder/IServiceManager.h> 19 #include "android/android_GenericMediaPlayer.h" 20 21 // number of SLuint32 fields to store a buffer event message in an item, by mapping each 22 // to the item key (SLuint32), the item size (SLuint32), and the item data (mask on SLuint32) 23 #define NB_BUFFEREVENT_ITEM_FIELDS 3 24 25 //-------------------------------------------------------------------------------------------------- 26 namespace android { 27 28 //-------------------------------------------------------------------------------------------------- 29 class StreamPlayer; 30 31 class StreamSourceAppProxy : public BnStreamSource { 32 public: 33 StreamSourceAppProxy( 34 IAndroidBufferQueue *androidBufferQueue, 35 const sp<CallbackProtector> &callbackProtector, 36 StreamPlayer *player); 37 virtual ~StreamSourceAppProxy(); 38 39 // store an item structure to indicate a processed buffer 40 static const SLuint32 kItemProcessed[NB_BUFFEREVENT_ITEM_FIELDS]; 41 42 // IStreamSource implementation 43 virtual void setListener(const sp<IStreamListener> &listener); // mediaserver calls exactly once 44 virtual void setBuffers(const Vector<sp<IMemory> > &buffers); // mediaserver calls exactly once 45 virtual void onBufferAvailable(size_t index); 46 47 // Consumption from ABQ 48 void pullFromBuffQueue(); 49 50 private: 51 void receivedCmd_l(IStreamListener::Command cmd, const sp<AMessage> &msg = NULL); 52 void receivedBuffer_l(size_t buffIndex, size_t buffLength); 53 54 public: 55 // Call at least once prior to releasing the last strong reference to this object. It causes 56 // the player to release all of its resources, similar to android.media.MediaPlayer disconnect. 57 void disconnect(); 58 59 private: 60 // protects mListener, mBuffers, mBuffersHasBeenSet, and mAvailableBuffers 61 Mutex mLock; 62 63 sp<IStreamListener> mListener; 64 // array of shared memory buffers 65 Vector<sp<IMemory> > mBuffers; 66 bool mBuffersHasBeenSet; 67 // list of available buffers in shared memory, identified by their index 68 List<size_t> mAvailableBuffers; 69 70 // the Android Buffer Queue from which data is consumed and written to shared memory 71 IAndroidBufferQueue* const mAndroidBufferQueue; 72 73 const sp<CallbackProtector> mCallbackProtector; 74 const wp<StreamPlayer> mPlayer; 75 76 DISALLOW_EVIL_CONSTRUCTORS(StreamSourceAppProxy); 77 }; 78 79 80 //-------------------------------------------------------------------------------------------------- 81 class StreamPlayer : public GenericMediaPlayer 82 { 83 public: 84 StreamPlayer(AudioPlayback_Parameters* params, bool hasVideo, 85 IAndroidBufferQueue *androidBufferQueue, const sp<CallbackProtector> &callbackProtector); 86 virtual ~StreamPlayer(); 87 88 // overridden from GenericPlayer 89 virtual void onMessageReceived(const sp<AMessage> &msg); 90 virtual void preDestroy(); 91 92 void queueRefilled(); 93 void appClear_l(); 94 95 protected: 96 97 enum { 98 // message to asynchronously notify mAppProxy it should try to pull from the Android 99 // Buffer Queue and push to shared memory (media server), either because the buffer queue 100 // was refilled, or because during playback, the shared memory buffers should remain 101 // filled to prevent it from draining (this can happen if the ABQ is not ready 102 // whenever a shared memory buffer becomes available) 103 kWhatPullFromAbq = 'plfq', 104 kWhatStopForDestroy = 's4ds' 105 }; 106 107 const sp<StreamSourceAppProxy> mAppProxy; // application proxy for the shared memory source 108 109 // overridden from GenericMediaPlayer 110 virtual void onPrepare(); 111 virtual void onPlay(); 112 113 void onPullFromAndroidBufferQueue(); 114 115 private: 116 void onStopForDestroy(); 117 118 Mutex mStopForDestroyLock; 119 Condition mStopForDestroyCondition; 120 bool mStopForDestroyCompleted; 121 122 DISALLOW_EVIL_CONSTRUCTORS(StreamPlayer); 123 }; 124 125 } // namespace android 126