chromium/third_party/mediapipe/src/mediapipe/framework/graph_output_stream.h

// Copyright 2019 The MediaPipe Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef MEDIAPIPE_FRAMEWORK_GRAPH_OUTPUT_STREAM_H_
#define MEDIAPIPE_FRAMEWORK_GRAPH_OUTPUT_STREAM_H_

#include <functional>
#include <memory>
#include <string>
#include <vector>

#include "absl/base/attributes.h"
#include "absl/base/thread_annotations.h"
#include "absl/log/absl_log.h"
#include "absl/strings/substitute.h"
#include "absl/synchronization/mutex.h"
#include "mediapipe/framework/input_stream_handler.h"
#include "mediapipe/framework/input_stream_manager.h"
#include "mediapipe/framework/output_stream_manager.h"
#include "mediapipe/framework/packet.h"
#include "mediapipe/framework/packet_set.h"
#include "mediapipe/framework/packet_type.h"
#include "mediapipe/framework/port/ret_check.h"
#include "mediapipe/framework/port/status.h"
#include "mediapipe/framework/timestamp.h"

namespace mediapipe {

class InputStreamHandler;

namespace internal {

// A base class of OutputStreamObserver and OutputStreamPollerImpl.
class GraphOutputStream { … };

// OutputStreamObserver that observes the output stream and passes packets to
// the caller via packet_callback.
class OutputStreamObserver : public GraphOutputStream { … };

// OutputStreamPollerImpl that returns packets to the caller via
// Next()/NextBatch().
// TODO: Support observe_timestamp_bounds.
class OutputStreamPollerImpl : public GraphOutputStream { … };

}  // namespace internal
}  // namespace mediapipe
#endif  // MEDIAPIPE_FRAMEWORK_GRAPH_OUTPUT_STREAM_H_