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 #ifndef A_MESSAGE_H_ 18 19 #define A_MESSAGE_H_ 20 21 #include <media/stagefright/foundation/ABase.h> 22 #include <media/stagefright/foundation/ALooper.h> 23 #include <utils/KeyedVector.h> 24 #include <utils/RefBase.h> 25 26 namespace android { 27 28 struct ABuffer; 29 struct AString; 30 struct Parcel; 31 32 struct AMessage : public RefBase { 33 AMessage(uint32_t what = 0, ALooper::handler_id target = 0); 34 35 static sp<AMessage> FromParcel(const Parcel &parcel); 36 void writeToParcel(Parcel *parcel) const; 37 38 void setWhat(uint32_t what); 39 uint32_t what() const; 40 41 void setTarget(ALooper::handler_id target); 42 ALooper::handler_id target() const; 43 44 void clear(); 45 46 void setInt32(const char *name, int32_t value); 47 void setInt64(const char *name, int64_t value); 48 void setSize(const char *name, size_t value); 49 void setFloat(const char *name, float value); 50 void setDouble(const char *name, double value); 51 void setPointer(const char *name, void *value); 52 void setString(const char *name, const char *s, ssize_t len = -1); 53 void setObject(const char *name, const sp<RefBase> &obj); 54 void setBuffer(const char *name, const sp<ABuffer> &buffer); 55 void setMessage(const char *name, const sp<AMessage> &obj); 56 57 void setRect( 58 const char *name, 59 int32_t left, int32_t top, int32_t right, int32_t bottom); 60 61 bool findInt32(const char *name, int32_t *value) const; 62 bool findInt64(const char *name, int64_t *value) const; 63 bool findSize(const char *name, size_t *value) const; 64 bool findFloat(const char *name, float *value) const; 65 bool findDouble(const char *name, double *value) const; 66 bool findPointer(const char *name, void **value) const; 67 bool findString(const char *name, AString *value) const; 68 bool findObject(const char *name, sp<RefBase> *obj) const; 69 bool findBuffer(const char *name, sp<ABuffer> *buffer) const; 70 bool findMessage(const char *name, sp<AMessage> *obj) const; 71 72 bool findRect( 73 const char *name, 74 int32_t *left, int32_t *top, int32_t *right, int32_t *bottom) const; 75 76 void post(int64_t delayUs = 0); 77 78 // Posts the message to its target and waits for a response (or error) 79 // before returning. 80 status_t postAndAwaitResponse(sp<AMessage> *response); 81 82 // If this returns true, the sender of this message is synchronously 83 // awaiting a response, the "replyID" can be used to send the response 84 // via "postReply" below. 85 bool senderAwaitsResponse(uint32_t *replyID) const; 86 87 void postReply(uint32_t replyID); 88 89 // Performs a deep-copy of "this", contained messages are in turn "dup'ed". 90 // Warning: RefBase items, i.e. "objects" are _not_ copied but only have 91 // their refcount incremented. 92 sp<AMessage> dup() const; 93 94 AString debugString(int32_t indent = 0) const; 95 96 enum Type { 97 kTypeInt32, 98 kTypeInt64, 99 kTypeSize, 100 kTypeFloat, 101 kTypeDouble, 102 kTypePointer, 103 kTypeString, 104 kTypeObject, 105 kTypeMessage, 106 kTypeRect, 107 kTypeBuffer, 108 }; 109 110 size_t countEntries() const; 111 const char *getEntryNameAt(size_t index, Type *type) const; 112 113 protected: 114 virtual ~AMessage(); 115 116 private: 117 uint32_t mWhat; 118 ALooper::handler_id mTarget; 119 120 struct Rect { 121 int32_t mLeft, mTop, mRight, mBottom; 122 }; 123 124 struct Item { 125 union { 126 int32_t int32Value; 127 int64_t int64Value; 128 size_t sizeValue; 129 float floatValue; 130 double doubleValue; 131 void *ptrValue; 132 RefBase *refValue; 133 AString *stringValue; 134 Rect rectValue; 135 } u; 136 const char *mName; 137 Type mType; 138 }; 139 140 enum { 141 kMaxNumItems = 64 142 }; 143 Item mItems[kMaxNumItems]; 144 size_t mNumItems; 145 146 Item *allocateItem(const char *name); 147 void freeItem(Item *item); 148 const Item *findItem(const char *name, Type type) const; 149 150 void setObjectInternal( 151 const char *name, const sp<RefBase> &obj, Type type); 152 153 DISALLOW_EVIL_CONSTRUCTORS(AMessage); 154 }; 155 156 } // namespace android 157 158 #endif // A_MESSAGE_H_ 159