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/*
Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
Research Center Canada)
Copyright (C) 2013 Matthias P. Braendli
http://mpb.li
ZeroMQ input. see www.zeromq.org for more info
From the ZeroMQ manpage 'zmq':
The 0MQ lightweight messaging kernel is a library which extends the standard
socket interfaces with features traditionally provided by specialised
messaging middleware products. 0MQ sockets provide an abstraction of
asynchronous message queues, multiple messaging patterns, message filtering
(subscriptions), seamless access to multiple transport protocols and more.
*/
/*
This file is part of CRC-DabMux.
It defines a ZeroMQ input for dabplus data.
CRC-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.
CRC-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 CRC-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DAB_INPUT_ZMQ_H
#define DAB_INPUT_ZMQ_H
#ifdef HAVE_INPUT_ZEROMQ
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <zmq.hpp>
#include <list>
#include <string>
#include "dabInput.h"
#include "StatsServer.h"
/* The frame_buffer contains DAB logical frames as defined in
* TS 102 563, section 6.
* Five elements of this buffer make one AAC superframe (120ms audio)
*/
// Number of elements to prebuffer before starting the pipeline
#define INPUT_ZMQ_PREBUFFERING (5*4) // 480ms
// Maximum frame_buffer size in number of elements
#define INPUT_ZMQ_MAX_BUFFER_SIZE (5*8) // 960ms
class DabInputZmq : public DabInputBase, public RemoteControllable {
public:
DabInputZmq(const std::string name)
: RemoteControllable(name),
m_name(name), m_zmq_context(1),
m_zmq_sock(m_zmq_context, ZMQ_SUB),
m_prebuffering(INPUT_ZMQ_PREBUFFERING),
m_bitrate(0) {
RC_ADD_PARAMETER(buffer,
"Size of the input buffer [aac superframes]");
}
virtual int open(const std::string inputUri);
virtual int readFrame(void* buffer, int size);
virtual int setBitrate(int bitrate);
virtual int close();
/* Remote control */
virtual void set_parameter(string parameter, string value);
/* Getting a parameter always returns a string. */
virtual string get_parameter(string parameter);
private:
int readFromSocket(int framesize);
std::string m_name;
zmq::context_t m_zmq_context;
zmq::socket_t m_zmq_sock; // handle for the zmq socket
int m_prebuffering;
std::list<char*> m_frame_buffer; //stores elements of type char[<framesize>]
int m_bitrate;
};
#endif // HAVE_INPUT_ZMQ
#endif // DAB_INPUT_ZMQ_H
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