mirror of
https://github.com/f4exb/sdrangel.git
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154 lines
4.2 KiB
C++
154 lines
4.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include <errno.h>
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#include <assert.h>
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#include "dsp/samplefifo.h"
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#include <QDebug>
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#include "filesourcethread.h"
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const int FileSourceThread::m_rateDivider = 1000/FILESOURCE_THROTTLE_MS;
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FileSourceThread::FileSourceThread(std::ifstream *samplesStream, SampleFifo* sampleFifo, QObject* parent) :
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QThread(parent),
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m_running(false),
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m_ifstream(samplesStream),
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m_buf(0),
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m_bufsize(0),
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m_chunksize(0),
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m_sampleFifo(sampleFifo),
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m_samplesCount(0),
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m_samplerate(0)
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{
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assert(m_ifstream != 0);
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}
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FileSourceThread::~FileSourceThread()
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{
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if (m_running) {
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stopWork();
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}
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if (m_buf != 0) {
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free(m_buf);
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}
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}
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void FileSourceThread::startWork()
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{
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qDebug() << "FileSourceThread::startWork: ";
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if (m_ifstream->is_open())
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{
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qDebug() << "FileSourceThread::startWork: file stream open, starting...";
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m_startWaitMutex.lock();
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start();
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while(!m_running)
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m_startWaiter.wait(&m_startWaitMutex, 100);
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m_startWaitMutex.unlock();
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}
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else
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{
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qDebug() << "FileSourceThread::startWork: file stream closed, not starting.";
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}
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}
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void FileSourceThread::stopWork()
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{
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qDebug() << "FileSourceThread::stopWork";
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m_running = false;
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wait();
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}
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void FileSourceThread::setSamplerate(int samplerate)
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{
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qDebug() << "FileSourceThread::setSamplerate:"
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<< " new:" << samplerate
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<< " old:" << m_samplerate;
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if (samplerate != m_samplerate)
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{
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if (m_running) {
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stopWork();
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}
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m_samplerate = samplerate;
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m_chunksize = (m_samplerate / m_rateDivider)*4; // TODO: implement FF and slow motion here. 4 corresponds to live. 2 is half speed, 8 is doulbe speed
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m_bufsize = m_chunksize;
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if (m_buf == 0) {
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qDebug() << " - Allocate buffer";
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m_buf = (quint8*) malloc(m_bufsize);
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} else {
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qDebug() << " - Re-allocate buffer";
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m_buf = (quint8*) realloc((void*) m_buf, m_bufsize);
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}
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qDebug() << " - size: " << m_bufsize
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<< " #samples: " << (m_bufsize/4);
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}
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//m_samplerate = samplerate;
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}
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void FileSourceThread::run()
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{
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int res;
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m_running = true;
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m_startWaiter.wakeAll();
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while(m_running) // actual work is in the tick() function
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{
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sleep(1);
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}
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m_running = false;
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}
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void FileSourceThread::connectTimer(const QTimer& timer)
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{
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qDebug() << "FileSourceThread::connectTimer";
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connect(&timer, SIGNAL(timeout()), this, SLOT(tick()));
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}
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void FileSourceThread::tick()
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{
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if (m_running)
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{
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// read samples directly feeding the SampleFifo (no callback)
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m_ifstream->read(reinterpret_cast<char*>(m_buf), m_chunksize);
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if (m_ifstream->eof())
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{
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m_sampleFifo->write(m_buf, m_ifstream->gcount());
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// TODO: handle loop playback situation
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m_ifstream->clear();
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m_ifstream->seekg(0, std::ios::beg);
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m_samplesCount = 0;
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//stopWork();
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//m_ifstream->close();
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}
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else
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{
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m_sampleFifo->write(m_buf, m_chunksize);
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m_samplesCount += m_chunksize / 4;
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}
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}
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}
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