123 lines
4.4 KiB
C++
123 lines
4.4 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef STAGEFRIGHT_CODEC2_ALLOCATOR_BUF_H_
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#define STAGEFRIGHT_CODEC2_ALLOCATOR_BUF_H_
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#include <BufferAllocator/BufferAllocator.h>
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#include <C2Buffer.h>
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#include <sys/stat.h> // stat
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#include <functional>
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#include <list>
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#include <mutex>
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#include <tuple>
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#include <unordered_map>
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namespace android {
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class C2DmaBufAllocator : public C2Allocator {
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public:
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virtual c2_status_t newLinearAllocation(
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uint32_t capacity, C2MemoryUsage usage,
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std::shared_ptr<C2LinearAllocation>* allocation) override;
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virtual c2_status_t priorLinearAllocation(
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const C2Handle* handle, std::shared_ptr<C2LinearAllocation>* allocation) override;
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C2DmaBufAllocator(id_t id);
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virtual c2_status_t status() const { return mInit; }
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virtual bool checkHandle(const C2Handle* const o) const override { return CheckHandle(o); }
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static bool CheckHandle(const C2Handle* const o);
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virtual id_t getId() const override;
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virtual C2String getName() const override;
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virtual std::shared_ptr<const Traits> getTraits() const override;
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// Usage mapper function used by the allocator
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// (usage, capacity) => (heapName, flags)
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//
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// capacity is aligned to the default block-size (defaults to page size) to
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// reduce caching overhead
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typedef std::function<c2_status_t(C2MemoryUsage, size_t,
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/* => */ C2String*, unsigned*)>
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UsageMapperFn;
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/**
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* Updates the usage mapper for subsequent new allocations, as well as the
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* supported minimum and maximum usage masks and default block-size to use
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* for the mapper.
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*
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* \param mapper This method is called to map Codec 2.0 buffer usage
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* to dmabuf heap name and flags required by the dma
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* buf heap device
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*
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* \param minUsage Minimum buffer usage required for supported
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* allocations (defaults to 0)
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*
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* \param maxUsage Maximum buffer usage supported by the ion allocator
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* (defaults to SW_READ | SW_WRITE)
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*
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* \param blockSize Alignment used prior to calling |mapper| for the
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* buffer capacity. This also helps reduce the size of
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* cache required for caching mapper results.
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* (defaults to the page size)
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*/
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void setUsageMapper(const UsageMapperFn& mapper, uint64_t minUsage, uint64_t maxUsage,
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uint64_t blockSize);
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static bool system_uncached_supported(void) {
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static int cached_result = -1;
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if (cached_result == -1) {
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struct stat buffer;
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cached_result = (stat("/dev/dma_heap/system-uncached", &buffer) == 0);
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}
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return (cached_result == 1);
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};
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private:
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c2_status_t mInit;
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BufferAllocator mBufferAllocator;
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c2_status_t mapUsage(C2MemoryUsage usage, size_t size,
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/* => */ C2String* heap_name, unsigned* flags);
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// this locks mTraits, mBlockSize, mUsageMapper, mUsageMapperLru and
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// mUsageMapperCache
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mutable std::mutex mUsageMapperLock;
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std::shared_ptr<const Traits> mTraits;
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size_t mBlockSize;
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UsageMapperFn mUsageMapper;
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typedef std::pair<uint64_t, size_t> MapperKey;
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struct MapperKeyHash {
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std::size_t operator()(const MapperKey&) const;
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};
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typedef std::tuple<C2String, unsigned, c2_status_t> MapperValue;
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typedef std::pair<MapperKey, MapperValue> MapperKeyValue;
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typedef std::list<MapperKeyValue>::iterator MapperKeyValuePointer;
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std::list<MapperKeyValue> mUsageMapperLru;
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std::unordered_map<MapperKey, MapperKeyValuePointer, MapperKeyHash> mUsageMapperCache;
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};
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} // namespace android
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#endif // STAGEFRIGHT_CODEC2_ALLOCATOR_BUF_H_
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