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/* ------------------------------------------------------------------
* Copyright (C) 2017 Matthias P. Braendli
*
* 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.
* -------------------------------------------------------------------
*/
/*! \section Input intefrace definition
*
* This describes the interface all inputs must implement.
*/
#pragma once
#include <stdint.h>
#include <stdio.h>
class InputInterface {
public:
virtual ~InputInterface() {}
/*! Open the input interface. In case of failure, throws a
* runtime_error.
*/
virtual void prepare(void) = 0;
/*! Return true if the input detected some sort of fault or
* abnormal termination
*/
virtual bool fault_detected(void) const = 0;
/*! Tell the input that it shall read from source and fill the queue.
* The num_samples argument is an indication on how many bytes
* the encoder needs.
* Some inputs fill the queue from another thread, in which case
* this function might only serve as indication that data gets
* consumed.
*
* A return value of true means data was read, a return value of
* false means a normal termination of the input (e.g. end of file)
*/
virtual bool read_source(size_t num_bytes) = 0;
};
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