| /* |
| * Copyright 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROID_AAUDIO_SHARED_MEMORY_PARCELABLE_H |
| #define ANDROID_AAUDIO_SHARED_MEMORY_PARCELABLE_H |
| |
| #include <stdint.h> |
| |
| #include <sys/mman.h> |
| #include <binder/Parcel.h> |
| #include <binder/Parcelable.h> |
| |
| using android::status_t; |
| using android::Parcel; |
| using android::Parcelable; |
| |
| namespace aaudio { |
| |
| // Arbitrary limits for sanity checks. TODO remove after debugging. |
| #define MAX_SHARED_MEMORIES (32) |
| #define MAX_MMAP_OFFSET_BYTES (32 * 1024 * 8) |
| #define MAX_MMAP_SIZE_BYTES (32 * 1024 * 8) |
| |
| /** |
| * This is a parcelable description of a shared memory referenced by a file descriptor. |
| * It may be divided into several regions. |
| */ |
| class SharedMemoryParcelable : public Parcelable { |
| public: |
| SharedMemoryParcelable(); |
| virtual ~SharedMemoryParcelable(); |
| |
| void setup(int fd, int32_t sizeInBytes); |
| |
| virtual status_t writeToParcel(Parcel* parcel) const override; |
| |
| virtual status_t readFromParcel(const Parcel* parcel) override; |
| |
| // mmap() shared memory |
| aaudio_result_t resolve(int32_t offsetInBytes, int32_t sizeInBytes, void **regionAddressPtr); |
| |
| // munmap() any mapped memory |
| aaudio_result_t close(); |
| |
| bool isFileDescriptorSafe(); |
| |
| int32_t getSizeInBytes(); |
| |
| aaudio_result_t validate(); |
| |
| void dump(); |
| |
| protected: |
| |
| #define MMAP_UNRESOLVED_ADDRESS reinterpret_cast<uint8_t*>(MAP_FAILED) |
| |
| int mFd = -1; |
| int mOriginalFd = -1; |
| int32_t mSizeInBytes = 0; |
| uint8_t *mResolvedAddress = MMAP_UNRESOLVED_ADDRESS; |
| }; |
| |
| } /* namespace aaudio */ |
| |
| #endif //ANDROID_AAUDIO_SHARED_MEMORY_PARCELABLE_H |