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/*
Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Her Majesty the Queen in
Right of Canada (Communications Research Center Canada)
Copyright (C) 2019
Matthias P. Braendli, matthias.braendli@mpb.li
http://www.opendigitalradio.org
*/
/*
This file is part of ODR-DabMux.
ODR-DabMux is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
ODR-DabMux is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "Log.h"
#include "RemoteControl.h"
#include <string>
namespace Inputs {
enum class BufferManagement {
// Use a buffer in the input that doesn't consider timestamps
Prebuffering,
// Buffer incoming data until a given timestamp is reached
Timestamped,
};
/* New input object base */
class InputBase {
public:
/* Throws runtime_error or invalid_argument on failure */
virtual void open(const std::string& name) = 0;
/* read a frame from the input. Buffer management is either not necessary
* (e.g. File input) or done with pre-buffering (network-based inputs).
*
* This ignores timestamps. All inputs support this.
*
* Returns number of data bytes written to the buffer. May clear the buffer
* if no data bytes available, in which case it will return 0.
*
* Returns negative on error.
*/
virtual size_t readFrame(uint8_t *buffer, size_t size) = 0;
/* read a frame from the input, taking into account timestamp. The timestamp of the data
* returned is not more recent than the timestamp specified in seconds and tsta.
*
* seconds is in UNIX epoch, utco is the TAI-UTC offset, tsta is in the format used by ETI.
*
* Returns number of data bytes written to the buffer. May clear the buffer
* if no data bytes available, in which case it will return 0.
*
* Returns negative on error.
*
* Calling this function on inputs that do not support timestamps returns 0. This allows
* changing the buffer management at runtime without risking an crash due to an exception.
*/
virtual size_t readFrame(uint8_t *buffer, size_t size, std::time_t seconds, int utco, uint32_t tsta) = 0;
/* Returns the effectively used bitrate, or throws invalid_argument on invalid bitrate */
virtual int setBitrate(int bitrate) = 0;
virtual void close() = 0;
virtual ~InputBase() {}
void setTistDelay(const std::chrono::milliseconds& ms) { m_tist_delay = ms; }
void setBufferManagement(BufferManagement bm) { m_bufferManagement = bm; }
BufferManagement getBufferManagement() const { return m_bufferManagement; }
protected:
InputBase() {}
std::atomic<BufferManagement> m_bufferManagement = ATOMIC_VAR_INIT(BufferManagement::Prebuffering);
std::chrono::milliseconds m_tist_delay;
};
};
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