1 /* 2 * Copyright 2016 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_AAUDIO_SHARED_MEMORY_PARCELABLE_H 18 #define ANDROID_AAUDIO_SHARED_MEMORY_PARCELABLE_H 19 20 #include <stdint.h> 21 22 #include <sys/mman.h> 23 #include <binder/Parcel.h> 24 #include <binder/Parcelable.h> 25 26 using android::status_t; 27 using android::Parcel; 28 using android::Parcelable; 29 30 namespace aaudio { 31 32 // Arbitrary limits for sanity checks. TODO remove after debugging. 33 #define MAX_SHARED_MEMORIES (32) 34 #define MAX_MMAP_OFFSET_BYTES (32 * 1024 * 8) 35 #define MAX_MMAP_SIZE_BYTES (32 * 1024 * 8) 36 37 /** 38 * This is a parcelable description of a shared memory referenced by a file descriptor. 39 * It may be divided into several regions. 40 */ 41 class SharedMemoryParcelable : public Parcelable { 42 public: 43 SharedMemoryParcelable(); 44 virtual ~SharedMemoryParcelable(); 45 46 void setup(int fd, int32_t sizeInBytes); 47 48 virtual status_t writeToParcel(Parcel* parcel) const override; 49 50 virtual status_t readFromParcel(const Parcel* parcel) override; 51 52 // mmap() shared memory 53 aaudio_result_t resolve(int32_t offsetInBytes, int32_t sizeInBytes, void **regionAddressPtr); 54 55 // munmap() any mapped memory 56 aaudio_result_t close(); 57 58 bool isFileDescriptorSafe(); 59 60 int32_t getSizeInBytes(); 61 62 aaudio_result_t validate(); 63 64 void dump(); 65 66 protected: 67 68 #define MMAP_UNRESOLVED_ADDRESS reinterpret_cast<uint8_t*>(MAP_FAILED) 69 70 int mFd = -1; 71 int mOriginalFd = -1; 72 int32_t mSizeInBytes = 0; 73 uint8_t *mResolvedAddress = MMAP_UNRESOLVED_ADDRESS; 74 }; 75 76 } /* namespace aaudio */ 77 78 #endif //ANDROID_AAUDIO_SHARED_MEMORY_PARCELABLE_H 79