91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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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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#ifndef MEDIAPIPE_FRAMEWORK_OUTPUT_SIDE_PACKET_IMPL_H_
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#define MEDIAPIPE_FRAMEWORK_OUTPUT_SIDE_PACKET_IMPL_H_
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#include <functional>
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#include <string>
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#include <vector>
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#include "mediapipe/framework/collection_item_id.h"
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#include "mediapipe/framework/input_side_packet_handler.h"
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#include "mediapipe/framework/output_side_packet.h"
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#include "mediapipe/framework/packet.h"
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#include "mediapipe/framework/packet_type.h"
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#include "mediapipe/framework/port.h"
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#include "mediapipe/framework/port/status.h"
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namespace mediapipe {
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class OutputSidePacketImpl : public OutputSidePacket {
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public:
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OutputSidePacketImpl() = default;
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~OutputSidePacketImpl() override = default;
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// Initializes the OutputSidePacketImpl.
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absl::Status Initialize(const std::string& name,
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const PacketType* packet_type);
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// Prepares this for processing. If an error occurs in a user called function
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// (such as Set()) then error_callback will be called before returning
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// control to the user.
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void PrepareForRun(std::function<void(absl::Status)> error_callback);
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// Gets the output side packet.
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Packet GetPacket() const { return packet_; }
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// Sets the output side packet. The Packet must contain the data.
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//
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// NOTE: Set() cannot report errors via the return value. It uses an error
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// callback function to report errors.
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void Set(const Packet& packet) override;
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// Adds an input side packet, which is represented as a pointer to an
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// InputSidePacketHandler and a CollectionItemId, to mirrors_.
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// The caller retains the ownership of the InputSidePacketHandler.
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void AddMirror(InputSidePacketHandler* input_side_packet_handler,
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CollectionItemId id);
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private:
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// The necessary information to locate an input side packet.
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struct Mirror {
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Mirror(InputSidePacketHandler* input_side_packet_handler,
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const CollectionItemId& id)
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: input_side_packet_handler(input_side_packet_handler), id(id) {}
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InputSidePacketHandler* const input_side_packet_handler;
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const CollectionItemId id;
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};
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// Called by Set().
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absl::Status SetInternal(const Packet& packet);
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// Triggers the error callback with absl::Status info when an error
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// occurs.
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void TriggerErrorCallback(const absl::Status& status) const;
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std::string name_;
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const PacketType* packet_type_;
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std::function<void(absl::Status)> error_callback_;
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Packet packet_;
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bool initialized_ = false;
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std::vector<Mirror> mirrors_;
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};
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} // namespace mediapipe
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#endif // MEDIAPIPE_FRAMEWORK_OUTPUT_SIDE_PACKET_IMPL_H_
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