Tx support: added a sample source FIFO class

2026-06-01 21:54:55 -04:00 · 2016-10-10 01:13:12 +02:00
parent 2f3bb94bbc
commit 6e82cb37b8
4 changed files with 128 additions and 0 deletions
@@ -0,0 +1,72 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2016 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 "samplesourcefifo.h"
+
+SampleSourceFifo::SampleSourceFifo(uint32_t size, uint32_t samplesChunkSize) :
+    m_size(size),
+    m_samplesChunkSize(samplesChunkSize),
+    m_i(0)
+{
+    assert(samplesChunkSize < m_size/4);
+    m_data.resize(2*m_size);
+}
+
+
+SampleSourceFifo::~SampleSourceFifo()
+{}
+
+void SampleSourceFifo::read(SampleVector::iterator& begin, SampleVector::iterator& end)
+{
+    QMutexLocker mutexLocker(&m_mutex);
+    end = m_data.begin() + m_size + m_i;
+    begin = end - m_samplesChunkSize;
+    emit dataRead();
+}
+
+void SampleSourceFifo::getReadIterator(SampleVector::iterator& beginRead)
+{
+    QMutexLocker mutexLocker(&m_mutex);
+    beginRead = m_data.begin() + m_size + m_i - m_samplesChunkSize;
+    emit dataRead();
+}
+
+void SampleSourceFifo::write(const Sample& sample)
+{
+    m_data[m_i] = sample;
+    m_data[m_i+m_size] = sample;
+
+    {
+        QMutexLocker mutexLocker(&m_mutex);
+        m_i = (m_i+1) % m_size;
+    }
+}
+
+void SampleSourceFifo::getWriteIterator(SampleVector::iterator& writeAt)
+{
+    writeAt = m_data.begin() + m_i;
+}
+
+void SampleSourceFifo::bumpIndex()
+{
+    m_data[m_i+m_size] = m_data[m_i];
+    m_i = (m_i+1) % m_size;
+
+    {
+        QMutexLocker mutexLocker(&m_mutex);
+        m_i = (m_i+1) % m_size;
+    }
+}