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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
Base class for buffered inputs
*/
/*
This file is part of CRC-DabMux.
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/>.
*/
#include "inputs/Input.h"
#include "TcpLog.h"
#include <string>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#ifndef _WIN32
# define O_BINARY 0
#endif
extern TcpLog etiLog;
int InputBuffered::ReadFrame(void* buffer, int size)
{
int retval = 0;
bool rc;
switch (m_bufferstate) {
case PREBUFFERING:
rc = FillBuffer();
if (rc) {
m_prebuffer_count--;
}
if (m_prebuffer_count == 0) {
etiLog.print(TcpLog::NOTICE, "input %s: pre-buffering complete\n",
GetName());
m_bufferstate = RUNNING;
}
break;
case RUNNING:
rc = FillBuffer();
if (m_buffer.empty()) {
etiLog.print(TcpLog::WARNING,
"input %s input empty, re-enabling pre-buffering\n",
GetName());
// reinitialise prebuffering
m_bufferstate = PREBUFFERING;
m_prebuffer_count = m_prebuffer_stages;
}
else {
std::vector<char> &buffer_head = m_buffer.front();
memcpy(buffer, &buffer_head.front(), size);
etiLog.print(TcpLog::NOTICE,
"input %s got %d, %d\n",
GetName(), rc, m_buffer.size());
m_buffer.pop_front();
retval = size;
}
break;
}
// If we haven't filled buffer, return a nulled one
if (retval == 0) {
memset(buffer, 0, size);
retval = size;
}
return retval;
}
// This implemenation of FillBuffer assumes that
// input and output frames have same size.
// That's not the case with DAB+ superframes
bool InputBuffered::FillBuffer()
{
if (m_buffer.size() > m_overfull_thresh) {
etiLog.print(TcpLog::WARNING,
"input %s buffer full, dropping frame !\n",
GetName());
// drop the surplus
int num_frames_to_drop = m_buffer.size() - m_overfull_thresh;
while (num_frames_to_drop--)
m_buffer.pop_front();
return true;
}
else {
// copy the input frame into the frame_buffer one to one
std::vector<char> frame(m_source_size);
int rc = ReadSource(&frame.front(), m_source_size);
if (rc == m_source_size)
{
m_buffer.push_back(frame);
return true;
}
else
{
return false;
}
}
}
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