78 lines
3.3 KiB
C++
78 lines
3.3 KiB
C++
// Copyright 2023 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_STREAM_HANDLER_IMMEDIATE_INPUT_STREAM_HANDLER_H_
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#define MEDIAPIPE_FRAMEWORK_STREAM_HANDLER_IMMEDIATE_INPUT_STREAM_HANDLER_H_
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#include <functional>
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#include <memory>
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#include <vector>
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#include "absl/base/thread_annotations.h"
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#include "absl/status/status.h"
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#include "absl/synchronization/mutex.h"
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#include "mediapipe/framework/calculator_context_manager.h"
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#include "mediapipe/framework/calculator_framework.h"
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#include "mediapipe/framework/input_stream_handler.h"
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#include "mediapipe/framework/tool/tag_map.h"
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namespace mediapipe {
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// An input stream handler that delivers input packets to the Calculator
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// immediately, with no dependency between input streams. It also invokes
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// Calculator::Process when any input stream becomes done.
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//
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// NOTE: If packets arrive successively on different input streams with
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// identical or decreasing timestamps, this input stream handler will
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// invoke its Calculator with a sequence of InputTimestamps that is
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// non-increasing. Its Calculator is responsible for accumulating packets
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// with the required timestamps before processing and delivering output.
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class ImmediateInputStreamHandler : public InputStreamHandler {
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public:
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ImmediateInputStreamHandler() = delete;
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ImmediateInputStreamHandler(
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std::shared_ptr<tool::TagMap> tag_map,
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CalculatorContextManager* calculator_context_manager,
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const MediaPipeOptions& options, bool calculator_run_in_parallel);
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protected:
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// Reinitializes this InputStreamHandler before each CalculatorGraph run.
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void PrepareForRun(std::function<void()> headers_ready_callback,
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std::function<void()> notification_callback,
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std::function<void(CalculatorContext*)> schedule_callback,
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std::function<void(absl::Status)> error_callback) override;
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// Returns kReadyForProcess whenever a Packet is available at any of
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// the input streams, or any input stream becomes done.
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NodeReadiness GetNodeReadiness(Timestamp* min_stream_timestamp) override;
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// Selects a packet on each stream with an available packet with the
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// specified timestamp, leaving other input streams unaffected.
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void FillInputSet(Timestamp input_timestamp,
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InputStreamShardSet* input_set) override;
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// Returns the number of sync-sets maintained by this input-handler.
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int SyncSetCount() override;
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absl::Mutex mutex_;
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// The packet-set builder for each input stream.
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std::vector<SyncSet> sync_sets_ ABSL_GUARDED_BY(mutex_);
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// The input timestamp for each kReadyForProcess input stream.
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std::vector<Timestamp> ready_timestamps_ ABSL_GUARDED_BY(mutex_);
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};
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} // namespace mediapipe
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#endif // MEDIAPIPE_FRAMEWORK_STREAM_HANDLER_IMMEDIATE_INPUT_STREAM_HANDLER_H_
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