1 /* 2 * Copyright (C) 2009 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 MEDIA_BUFFER_BASE_H_ 18 19 #define MEDIA_BUFFER_BASE_H_ 20 21 #include <media/MediaExtractorPluginApi.h> 22 #include <media/stagefright/foundation/AMessage.h> 23 #include <media/NdkMediaFormatPriv.h> 24 25 namespace android { 26 27 class MediaBufferBase; 28 class MetaDataBase; 29 30 class MediaBufferObserver { 31 public: MediaBufferObserver()32 MediaBufferObserver() {} ~MediaBufferObserver()33 virtual ~MediaBufferObserver() {} 34 35 virtual void signalBufferReturned(MediaBufferBase *buffer) = 0; 36 37 private: 38 MediaBufferObserver(const MediaBufferObserver &); 39 MediaBufferObserver &operator=(const MediaBufferObserver &); 40 }; 41 42 class MediaBufferBase { 43 public: 44 static MediaBufferBase *Create(size_t size); 45 46 // If MediaBufferGroup is set, decrement the local reference count; 47 // if the local reference count drops to 0, return the buffer to the 48 // associated MediaBufferGroup. 49 // 50 // If no MediaBufferGroup is set, the local reference count must be zero 51 // when called, whereupon the MediaBuffer is deleted. 52 virtual void release() = 0; 53 54 // Increments the local reference count. 55 // Use only when MediaBufferGroup is set. 56 virtual void add_ref() = 0; 57 58 virtual void *data() const = 0; 59 virtual size_t size() const = 0; 60 61 virtual size_t range_offset() const = 0; 62 virtual size_t range_length() const = 0; 63 64 virtual void set_range(size_t offset, size_t length) = 0; 65 66 virtual MetaDataBase& meta_data() = 0; 67 68 // Clears meta data and resets the range to the full extent. 69 virtual void reset() = 0; 70 71 virtual void setObserver(MediaBufferObserver *group) = 0; 72 73 virtual int refcount() const = 0; 74 75 virtual int localRefcount() const = 0; 76 virtual int remoteRefcount() const = 0; 77 ~MediaBufferBase()78 virtual ~MediaBufferBase() { 79 delete mWrapper; 80 delete mFormat; 81 }; 82 wrap()83 CMediaBuffer *wrap() { 84 if (mWrapper) { 85 return mWrapper; 86 } 87 mWrapper = new CMediaBuffer; 88 mWrapper->handle = this; 89 90 mWrapper->release = [](void *handle) -> void { 91 ((MediaBufferBase*)handle)->release(); 92 }; 93 94 mWrapper->data = [](void *handle) -> void * { 95 return ((MediaBufferBase*)handle)->data(); 96 }; 97 98 mWrapper->size = [](void *handle) -> size_t { 99 return ((MediaBufferBase*)handle)->size(); 100 }; 101 102 mWrapper->range_offset = [](void *handle) -> size_t { 103 return ((MediaBufferBase*)handle)->range_offset(); 104 }; 105 106 mWrapper->range_length = [](void *handle) -> size_t { 107 return ((MediaBufferBase*)handle)->range_length(); 108 }; 109 110 mWrapper->set_range = [](void *handle, size_t offset, size_t length) -> void { 111 return ((MediaBufferBase*)handle)->set_range(offset, length); 112 }; 113 114 mWrapper->meta_data = [](void *handle) -> AMediaFormat* { 115 if (((MediaBufferBase*)handle)->mFormat == nullptr) { 116 sp<AMessage> msg = new AMessage(); 117 ((MediaBufferBase*)handle)->mFormat = AMediaFormat_fromMsg(&msg); 118 } 119 return ((MediaBufferBase*)handle)->mFormat; 120 }; 121 122 return mWrapper; 123 } 124 protected: MediaBufferBase()125 MediaBufferBase() { 126 mWrapper = nullptr; 127 mFormat = nullptr; 128 } 129 private: 130 CMediaBuffer *mWrapper; 131 AMediaFormat *mFormat; 132 }; 133 134 } // namespace android 135 136 #endif // MEDIA_BUFFER_BASE_H_ 137