mirror of
https://github.com/openharmony/midi_framework.git
synced 2026-06-30 22:17:53 -04:00
owen_creeper
123 lines
4.5 KiB
C++
123 lines
4.5 KiB
C++
/*
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* Copyright (c) 2025 Huawei Device Co., Ltd.
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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 MIDI_SHARED_RING_H
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#define MIDI_SHARED_RING_H
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#include <cstdint>
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#include <cstddef>
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#include <atomic>
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#include <vector>
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#include <new>
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#include "midi_info.h"
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#include "futex_tool.h"
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#include "midi_shared_memory.h"
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namespace OHOS {
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namespace MIDI {
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enum class MidiStatusCode : int32_t { OK = 0, WOULD_BLOCK, INVALID_ARGUMENT, SHM_BROKEN, INTERNAL_ERROR };
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struct alignas(64) ControlHeader { // 64 bytes for cache line
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std::atomic<uint32_t> readPosition; // read index range: (0..capacity-1)
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std::atomic<uint32_t> writePosition; // write index range: (0..capacity-1)
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uint32_t capacity; // ring data capacity
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std::atomic<uint32_t> futexObj; // for futex
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uint32_t flags; // for expand
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};
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enum ShmEventFlags : uint32_t {
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SHM_EVENT_FLAG_NONE = 0,
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SHM_EVENT_FLAG_WRAP = 1u << 0, // indicate wrap, length must be 0
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};
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struct ShmMidiEventHeader {
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uint64_t timestamp;
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uint32_t length;
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uint32_t flags;
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};
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class MidiSharedRing : public Parcelable {
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public:
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explicit MidiSharedRing(uint32_t ringCapacityBytes);
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// creat MidiSharedRing locally or remotely
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static std::shared_ptr<MidiSharedRing> CreateFromLocal(
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size_t ringCapacityBytes);
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static std::shared_ptr<MidiSharedRing> CreateFromRemote(size_t ringCapacityBytes, int dataFd);
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// idl
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bool Marshalling(Parcel &parcel) const override;
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static MidiSharedRing *Unmarshalling(Parcel &parcel);
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int32_t Init(int dataFd);
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MidiSharedRing(const MidiSharedRing &) = delete;
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MidiSharedRing &operator=(const MidiSharedRing &) = delete;
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~MidiSharedRing() = default;
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uint32_t GetCapacity() const;
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uint32_t GetReadPosition() const;
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uint32_t GetWritePosition() const;
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uint8_t *GetDataBase() const;
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std::atomic<uint32_t> *GetFutex() const;
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FutexCode WaitFor(int64_t timeoutInNs, const std::function<bool(void)> &pred);
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void NotifyConsumer(uint32_t wakeVal = IS_READY);
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bool IsEmpty() const;
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ControlHeader *GetControlHeader() const;
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MidiStatusCode TryWriteEvents(
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const MidiEventInner *events, uint32_t eventCount, uint32_t *eventsWritten, bool notify = true);
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MidiStatusCode TryWriteEvent(const MidiEventInner &event, bool notify = true);
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struct PeekedEvent {
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const ShmMidiEventHeader *headerPtr = nullptr;
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const uint8_t *payloadPtr = nullptr;
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uint64_t timestamp = 0;
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uint32_t length = 0;
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uint32_t beginOffset = 0; // header
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uint32_t endOffset = 0; // header + payload range[0, capacity]
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};
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MidiStatusCode PeekNext(PeekedEvent &outEvent);
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void CommitRead(const PeekedEvent &event);
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void DrainToBatch(std::vector<MidiEvent> &outEvents, std::vector<std::vector<uint32_t>> &outPayloadBuffers,
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uint32_t maxEvents = 0);
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private:
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bool ValidateOneEvent(const MidiEventInner &event) const;
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void WakeFutex(uint32_t wakeVal = IS_READY);
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void WriteEvent(uint32_t writeIndex, const MidiEventInner &event);
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MidiStatusCode ValidateWriteArgs(const MidiEventInner *events, uint32_t eventCount) const;
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MidiStatusCode TryWriteOneEvent(
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const MidiEventInner &event, uint32_t length, uint32_t readIndex, uint32_t &writeIndex);
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bool UpdateWriteIndexIfNeed(uint32_t &writeIndex, uint32_t needed);
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MidiStatusCode UpdateReadIndexIfNeed(uint32_t &readIndex, uint32_t writeIndex);
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MidiStatusCode HandleWrapIfNeeded(const ShmMidiEventHeader &hdr, uint32_t &r);
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MidiStatusCode BuildPeekedEvent(const ShmMidiEventHeader &hdr, uint32_t readIndex, PeekedEvent &outEvent);
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MidiEvent CopyOut(const PeekedEvent &peekedEvent, std::vector<uint32_t> &outPayloadBuffer) const;
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uint8_t *base_{nullptr};
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ControlHeader *controler_{nullptr};
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uint8_t *ringBase_{nullptr};
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uint32_t capacity_{0};
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uint32_t totalMemorySize_{0};
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mutable std::shared_ptr<MidiSharedMemory> dataMem_ = nullptr;
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};
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} // namespace MIDI
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} // namespace OHOS
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#endif |