86 lines
3.0 KiB
C++
86 lines
3.0 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_INPUT_SIDE_PACKET_HANDLER_H_
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#define MEDIAPIPE_FRAMEWORK_INPUT_SIDE_PACKET_HANDLER_H_
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#include <atomic>
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#include <functional>
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#include <map>
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#include <memory>
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#include <string>
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#include "mediapipe/framework/collection_item_id.h"
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#include "mediapipe/framework/packet.h"
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#include "mediapipe/framework/packet_set.h"
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#include "mediapipe/framework/packet_type.h"
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#include "mediapipe/framework/port/status.h"
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namespace mediapipe {
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// The input side packet handler is invoked every time any of the input side
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// packets is set and notifies the calculator node when all the input side
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// packets become available. The input side packet handler owns and manages
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// the input side packets. OutputSidePacket sets an input side packet through
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// its input side packet handler.
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class InputSidePacketHandler {
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public:
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InputSidePacketHandler() = default;
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~InputSidePacketHandler() = default;
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// Resets the input side packet handler and its underlying input side packets
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// for another run of the graph.
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absl::Status PrepareForRun(
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const PacketTypeSet* input_side_packet_types,
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const std::map<std::string, Packet>& all_side_packets,
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std::function<void()> input_side_packets_ready_callback,
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std::function<void(absl::Status)> error_callback);
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// Sets a particular input side packet.
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void Set(CollectionItemId id, const Packet& packet);
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const PacketSet& InputSidePackets() const { return *input_side_packets_; }
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// Returns true if the set of input-side-packets has changed since the
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// previous run.
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bool InputSidePacketsChanged();
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// Returns the number of missing input side packets.
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int MissingInputSidePacketCount() const {
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return missing_input_side_packet_count_.load(std::memory_order_relaxed);
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}
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private:
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// Called by Set().
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absl::Status SetInternal(CollectionItemId id, 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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const PacketTypeSet* input_side_packet_types_;
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std::unique_ptr<PacketSet> input_side_packets_;
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std::unique_ptr<PacketSet> prev_input_side_packets_;
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std::atomic<int> missing_input_side_packet_count_{0};
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std::function<void()> input_side_packets_ready_callback_;
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std::function<void(absl::Status)> error_callback_;
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};
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} // namespace mediapipe
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#endif // MEDIAPIPE_FRAMEWORK_INPUT_SIDE_PACKET_HANDLER_H_
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