Add signed 16-bit PCM 2 channel .wav file support to File Input and File Record plugins

plugins/samplesource/fileinput/fileinput.cpp

@@ -21,6 +21,7 @@
 #include <QDebug>
 #include <QNetworkReply>
 #include <QBuffer>
+#include <QRegExp>
 
 #include "SWGDeviceSettings.h"
 #include "SWGFileInputSettings.h"
@@ -32,6 +33,7 @@
 #include "dsp/dspdevicesourceengine.h"
 #include "dsp/dspengine.h"
 #include "dsp/filerecord.h"
+#include "dsp/wavfilerecord.h"
 #include "device/deviceapi.h"
 
 #include "fileinput.h"
@@ -99,7 +101,74 @@ void FileInput::openFileStream()
 #endif
 	quint64 fileSize = m_ifstream.tellg();
 
-	if (fileSize > sizeof(FileRecord::Header))
+	if (m_settings.m_fileName.endsWith(".wav"))
+    {
+        WavFileRecord::Header header;
+        m_ifstream.seekg(0, std::ios_base::beg);
+        bool headerOK = WavFileRecord::readHeader(m_ifstream, header);
+        m_sampleRate = header.m_sampleRate;
+        if (header.m_auxiHeader.m_size > 0)
+        {
+            // Some WAV files written by SDR tools have auxi header
+            m_centerFrequency = header.m_auxi.m_centerFreq;
+            m_startingTimeStamp = QDateTime(QDate(
+                                                header.m_auxi.m_startTime.m_year,
+                                                header.m_auxi.m_startTime.m_month,
+                                                header.m_auxi.m_startTime.m_day
+                                            ), QTime(
+                                                header.m_auxi.m_startTime.m_hour,
+                                                header.m_auxi.m_startTime.m_minute,
+                                                header.m_auxi.m_startTime.m_second,
+                                                header.m_auxi.m_startTime.m_milliseconds
+                                            )).toMSecsSinceEpoch() / 1000;
+        }
+        else
+        {
+            // Attempt to extract time and frequency from filename
+            QRegExp dateTimeRE("([12][0-9][0-9][0-9]).?([01][0-9]).?([0-3][0-9]).?([0-2][0-9]).?([0-5][0-9]).?([0-5][0-9])");
+            if (dateTimeRE.indexIn(m_settings.m_fileName) != -1)
+            {
+                m_startingTimeStamp = QDateTime(QDate(
+                                                    dateTimeRE.capturedTexts()[1].toInt(),
+                                                    dateTimeRE.capturedTexts()[2].toInt(),
+                                                    dateTimeRE.capturedTexts()[3].toInt()
+                                                ), QTime(
+                                                    dateTimeRE.capturedTexts()[4].toInt(),
+                                                    dateTimeRE.capturedTexts()[5].toInt(),
+                                                    dateTimeRE.capturedTexts()[6].toInt()
+                                                )).toMSecsSinceEpoch() / 1000;
+            }
+            // Attempt to extract centre frequency from filename
+            QRegExp freqkRE("(([0-9]+)kHz)");
+            QRegExp freqRE("(([0-9]+)Hz)");
+            if (freqkRE.indexIn(m_settings.m_fileName))
+            {
+                m_centerFrequency = freqkRE.capturedTexts()[2].toLongLong() * 1000LL;
+            }
+            else if (freqRE.indexIn(m_settings.m_fileName))
+            {
+                m_centerFrequency = freqRE.capturedTexts()[2].toLongLong();
+            }
+        }
+        m_sampleSize = header.m_bitsPerSample;
+
+        if (headerOK && (m_sampleRate > 0) && (m_sampleSize > 0))
+        {
+            m_recordLengthMuSec = ((fileSize - m_ifstream.tellg()) * 1000000UL) / ((m_sampleSize == 24 ? 8 : 4) * m_sampleRate);
+        }
+        else
+        {
+            qCritical("FileInput::openFileStream: invalid .wav file");
+            m_recordLengthMuSec = 0;
+        }
+
+        if (getMessageQueueToGUI())
+        {
+            MsgReportHeaderCRC *report = MsgReportHeaderCRC::create(headerOK);
+            getMessageQueueToGUI()->push(report);
+        }
+    }
+    else if (fileSize > sizeof(FileRecord::Header))
 	{
 	    FileRecord::Header header;
 	    m_ifstream.seekg(0,std::ios_base::beg);

plugins/samplesource/fileinput/fileinputgui.cpp

@@ -302,7 +302,7 @@ void FileInputGUI::on_showFileDialog_clicked(bool checked)
 {
     (void) checked;
 	QString fileName = QFileDialog::getOpenFileName(this,
-	    tr("Open I/Q record file"), ".", tr("SDR I/Q Files (*.sdriq)"), 0, QFileDialog::DontUseNativeDialog);
+	    tr("Open I/Q record file"), ".", tr("SDR I/Q Files (*.sdriq *.wav)"), 0, QFileDialog::DontUseNativeDialog);
 
 	if (fileName != "")
 	{

plugins/samplesource/fileinput/readme.md

@@ -2,7 +2,9 @@
 
 <h2>Introduction</h2>
 
-This plugin reads a file of I/Q samples that have been previously saved with the file record button of other sampling source devices. The file starts with a 32 byte header of all unsigned integer of various sizes containing meta data:
+This plugin reads a file of I/Q samples that have been previously saved with the file record button of other sampling source devices. The plugin supports SDRangel's own .sdriq file format as well as signed 16-bit PCM, 2 channel .wav files (including support for optional auxi headers, containing centre frequency).
+
+An .sdriq file starts with a 32 byte header of all unsigned integer of various sizes containing meta data:
 
 <table>
   <tr>
@@ -66,7 +68,7 @@ This is the center frequency of reception in kHz when the record was taken and w
 
 <h3>4: Open file</h3>
 
-Opens a file dialog to select the input file. It expects a default extension of `.sdriq`. This button is disabled when the stream is running. You need to pause (button 11) to make it active and thus be able to select another file.
+Opens a file dialog to select the input file. It expects an extension of `.sdriq` or `.wav`. This button is disabled when the stream is running. You need to pause (button 11) to make it active and thus be able to select another file.
 
 <h3>5: File path</h3>