79 lines
2.6 KiB
C++
79 lines
2.6 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_STREAM_POLLER_H_
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#define MEDIAPIPE_FRAMEWORK_OUTPUT_STREAM_POLLER_H_
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#include <memory>
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#include "mediapipe/framework/graph_output_stream.h"
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namespace mediapipe {
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// The public interface of output stream poller.
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class OutputStreamPoller {
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public:
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OutputStreamPoller(const OutputStreamPoller&) = delete;
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OutputStreamPoller& operator=(const OutputStreamPoller&) = delete;
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OutputStreamPoller(OutputStreamPoller&&) = default;
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// Move assignment needs to be explicitly defaulted to allow ASSIGN_OR_RETURN
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// on `StatusOr<OutputStreamPoller>`.
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OutputStreamPoller& operator=(OutputStreamPoller&&) = default;
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// Resets OutputStramPollerImpl and cleans the internal packet queue.
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void Reset() {
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auto poller = internal_poller_impl_.lock();
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CHECK(poller) << "OutputStreamPollerImpl is already destroyed.";
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poller->Reset();
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}
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// Gets the next packet (block until it is available or the stream is
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// done). Returns true if successful.
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ABSL_MUST_USE_RESULT bool Next(Packet* packet) {
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auto poller = internal_poller_impl_.lock();
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if (!poller) {
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return false;
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}
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return poller->Next(packet);
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}
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void SetMaxQueueSize(int queue_size) {
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auto poller = internal_poller_impl_.lock();
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CHECK(poller) << "OutputStreamPollerImpl is already destroyed.";
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return poller->SetMaxQueueSize(queue_size);
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}
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// Returns the number of packets in the queue.
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int QueueSize() {
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auto poller = internal_poller_impl_.lock();
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CHECK(poller) << "OutputStreamPollerImpl is already destroyed.";
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return poller->QueueSize();
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}
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private:
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OutputStreamPoller(
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std::shared_ptr<internal::OutputStreamPollerImpl> internal_poller_impl)
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: internal_poller_impl_(internal_poller_impl) {}
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std::weak_ptr<internal::OutputStreamPollerImpl> internal_poller_impl_;
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// Friend class to connect OutputStreamPoller with
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// internal::OutputStreamPollerImpl.
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friend class CalculatorGraph;
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};
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} // namespace mediapipe
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#endif // MEDIAPIPE_FRAMEWORK_OUTPUT_STREAM_POLLER_H_
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