sdrangel/sdrbase/audio/audiofifo.cpp

188 wiersze
4.0 KiB
C++
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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// written by Christian Daniel //
// //
// 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 //
// (at your option) any later version. //
// //
// 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 <string.h>
#include <QTime>
#include "dsp/dsptypes.h"
#include "audio/audiofifo.h"
#include "audio/audionetsink.h"
#define MIN(x, y) ((x) < (y) ? (x) : (y))
AudioFifo::AudioFifo() :
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m_fifo(nullptr),
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m_sampleSize(sizeof(AudioSample))
{
m_size = 0;
m_fill = 0;
m_head = 0;
m_tail = 0;
}
AudioFifo::AudioFifo(uint32_t numSamples) :
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m_fifo(nullptr),
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m_sampleSize(sizeof(AudioSample))
{
QMutexLocker mutexLocker(&m_mutex);
create(numSamples);
}
AudioFifo::~AudioFifo()
{
QMutexLocker mutexLocker(&m_mutex);
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if (m_fifo)
{
delete[] m_fifo;
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m_fifo = nullptr;
}
m_size = 0;
}
bool AudioFifo::setSize(uint32_t numSamples)
{
QMutexLocker mutexLocker(&m_mutex);
return create(numSamples);
}
uint AudioFifo::write(const quint8* data, uint32_t numSamples)
{
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uint32_t total;
uint32_t remaining;
uint32_t copyLen;
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if (!m_fifo) {
return 0;
}
m_mutex.lock();
total = MIN(numSamples, m_size - m_fill);
remaining = total;
while (remaining != 0)
{
if (isFull())
{
m_mutex.unlock();
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if (total - remaining > 0) {
emit dataReady();
}
return total - remaining; // written so far
}
copyLen = MIN(remaining, m_size - m_fill);
copyLen = MIN(copyLen, m_size - m_tail);
memcpy(m_fifo + (m_tail * m_sampleSize), data, copyLen * m_sampleSize);
m_tail += copyLen;
m_tail %= m_size;
m_fill += copyLen;
data += copyLen * m_sampleSize;
remaining -= copyLen;
}
m_mutex.unlock();
emit dataReady();
return total;
}
uint AudioFifo::read(quint8* data, uint32_t numSamples)
{
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uint32_t total;
uint32_t remaining;
uint32_t copyLen;
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if (!m_fifo) {
return 0;
}
m_mutex.lock();
total = MIN(numSamples, m_fill);
remaining = total;
while (remaining != 0)
{
if (isEmpty())
{
m_mutex.unlock();
return total - remaining; // read so far
}
copyLen = MIN(remaining, m_fill);
copyLen = MIN(copyLen, m_size - m_head);
memcpy(data, m_fifo + (m_head * m_sampleSize), copyLen * m_sampleSize);
m_head += copyLen;
m_head %= m_size;
m_fill -= copyLen;
data += copyLen * m_sampleSize;
remaining -= copyLen;
}
m_mutex.unlock();
return total;
}
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uint AudioFifo::drain(uint32_t numSamples)
{
QMutexLocker mutexLocker(&m_mutex);
if(numSamples > m_fill)
{
numSamples = m_fill;
}
m_head = (m_head + numSamples) % m_size;
m_fill -= numSamples;
return numSamples;
}
void AudioFifo::clear()
{
QMutexLocker mutexLocker(&m_mutex);
m_fill = 0;
m_head = 0;
m_tail = 0;
}
bool AudioFifo::create(uint32_t numSamples)
{
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if (m_fifo)
{
delete[] m_fifo;
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m_fifo = nullptr;
}
m_fill = 0;
m_head = 0;
m_tail = 0;
m_fifo = new qint8[numSamples * m_sampleSize];
m_size = numSamples;
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return true;
}