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sdrangel/plugins/samplesource/filesource/filesourcethread.cpp
2017-05-25 20:13:34 +02:00

179 lines
5.0 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2015 Edouard Griffiths, F4EXB //
// //
// This program 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 as version 3 of the License, or //
// //
// This program 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <QDebug>
#include "dsp/filerecord.h"
#include "filesourcethread.h"
#include "dsp/samplesinkfifo.h"
FileSourceThread::FileSourceThread(std::ifstream *samplesStream, SampleSinkFifo* sampleFifo, QObject* parent) :
QThread(parent),
m_running(false),
m_ifstream(samplesStream),
m_buf(0),
m_bufsize(0),
m_chunksize(0),
m_sampleFifo(sampleFifo),
m_samplesCount(0),
m_samplerate(0),
m_throttlems(FILESOURCE_THROTTLE_MS),
m_throttleToggle(false)
{
assert(m_ifstream != 0);
}
FileSourceThread::~FileSourceThread()
{
if (m_running) {
stopWork();
}
if (m_buf != 0) {
free(m_buf);
}
}
void FileSourceThread::startWork()
{
qDebug() << "FileSourceThread::startWork: ";
if (m_ifstream->is_open())
{
qDebug() << "FileSourceThread::startWork: file stream open, starting...";
m_startWaitMutex.lock();
m_elapsedTimer.start();
start();
while(!m_running)
m_startWaiter.wait(&m_startWaitMutex, 100);
m_startWaitMutex.unlock();
}
else
{
qDebug() << "FileSourceThread::startWork: file stream closed, not starting.";
}
}
void FileSourceThread::stopWork()
{
qDebug() << "FileSourceThread::stopWork";
m_running = false;
wait();
}
void FileSourceThread::setSamplerate(int samplerate)
{
qDebug() << "FileSourceThread::setSamplerate:"
<< " new:" << samplerate
<< " old:" << m_samplerate;
if (samplerate != m_samplerate)
{
if (m_running) {
stopWork();
}
m_samplerate = samplerate;
// TODO: implement FF and slow motion here. 4 corresponds to live. 2 is half speed, 8 is doulbe speed
m_chunksize = (m_samplerate * 4 * m_throttlems) / 1000;
setBuffer(m_chunksize);
}
//m_samplerate = samplerate;
}
void FileSourceThread::setBuffer(std::size_t chunksize)
{
if (chunksize > m_bufsize)
{
m_bufsize = chunksize;
if (m_buf == 0)
{
qDebug() << "FileSourceThread::setBuffer: Allocate buffer";
m_buf = (quint8*) malloc(m_bufsize);
}
else
{
qDebug() << "FileSourceThread::setBuffer: Re-allocate buffer";
quint8 *buf = m_buf;
m_buf = (quint8*) realloc((void*) m_buf, m_bufsize);
if (!m_buf) free(buf);
}
qDebug() << "FileSourceThread::setBuffer: size: " << m_bufsize
<< " #samples: " << (m_bufsize/4);
}
}
void FileSourceThread::run()
{
m_running = true;
m_startWaiter.wakeAll();
while(m_running) // actual work is in the tick() function
{
sleep(1);
}
m_running = false;
}
void FileSourceThread::connectTimer(const QTimer& timer)
{
qDebug() << "FileSourceThread::connectTimer";
connect(&timer, SIGNAL(timeout()), this, SLOT(tick()));
}
void FileSourceThread::tick()
{
if (m_running)
{
qint64 throttlems = m_elapsedTimer.restart();
if (throttlems != m_throttlems)
{
m_throttlems = throttlems;
m_chunksize = 4 * ((m_samplerate * (m_throttlems+(m_throttleToggle ? 1 : 0))) / 1000);
m_throttleToggle = !m_throttleToggle;
setBuffer(m_chunksize);
}
// read samples directly feeding the SampleFifo (no callback)
m_ifstream->read(reinterpret_cast<char*>(m_buf), m_chunksize);
if (m_ifstream->eof())
{
m_sampleFifo->write(m_buf, m_ifstream->gcount());
// TODO: handle loop playback situation
m_ifstream->clear();
m_ifstream->seekg(sizeof(FileRecord::Header), std::ios::beg);
m_samplesCount = 0;
//stopWork();
//m_ifstream->close();
}
else
{
m_sampleFifo->write(m_buf, m_chunksize);
m_samplesCount += m_chunksize / 4;
}
}
}