Add source code for FileReader

Source/Processors/FileReader.cpp

+/*
+    ------------------------------------------------------------------
+
+    This file is part of the Open Ephys GUI
+    Copyright (C) 2013 Open Ephys
+
+    ------------------------------------------------------------------
+
+    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, either 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 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 "FileReader.h"
+#include "Editors/FileReaderEditor.h"
+#include <stdio.h>
+
+FileReader::FileReader()
+    : GenericProcessor("File Reader")
+{
+
+	input = 0;
+	timestamp = 0; 
+
+	enabledState(false);
+
+}
+
+FileReader::~FileReader()
+{
+	if (input)
+        fclose(input);
+}
+
+AudioProcessorEditor* FileReader::createEditor()
+{
+	editor = new FileReaderEditor(this, true);
+
+	return editor;
+
+}
+
+
+float FileReader::getDefaultSampleRate()
+{
+    return 40000.0f;
+}
+
+int FileReader::getDefaultNumOutputs()
+{
+    return 16;
+}
+
+float FileReader::getDefaultBitVolts()
+{
+    return 0.0305f;
+}
+
+void FileReader::enabledState(bool t)
+{
+
+	isEnabled = t;
+
+}
+
+
+void FileReader::setFile(String fullpath)
+{
+
+    filePath = fullpath;
+
+    const char* path = filePath.getCharPointer();
+
+    if (input)
+        fclose(input);
+
+    input = fopen(path, "r");
+
+    // Avoid a segfault if file isn't found
+    if (!input)
+    {
+        std::cout << "Can't find data file "
+                  << '"' << path << "\""
+                  << std::endl;
+        return;
+    }
+
+    fseek(input, 0, SEEK_END);
+    lengthOfInputFile = ftell(input);
+    rewind(input);
+
+}
+
+
+String FileReader::getFile()
+{
+    return filePath;
+}
+
+void FileReader::updateSettings()
+{
+
+}
+
+
+
+void FileReader::process(AudioSampleBuffer& buffer, MidiBuffer& events, int& nSamples)
+{
+
+	uint8 data[8];
+    memcpy(data, &timestamp, 8);
+
+    // generate timestamp
+    addEvent(events,    // MidiBuffer
+             TIMESTAMP, // eventType
+             0,         // sampleNum
+             nodeId,    // eventID
+             0,		 // eventChannel
+             8,         // numBytes
+             data   // data
+            );
+
+    // FIXME: needs to account for the fact that the ratio might not be an exact
+    //        integer value
+	int samplesNeeded = (int) float(buffer.getNumSamples()) * (getDefaultSampleRate()/44100.0f); 
+
+	 if (ftell(input) >= lengthOfInputFile - samplesNeeded)
+     {
+        rewind(input);
+     }
+
+     size_t numRead = fread(readBuffer, 2, samplesNeeded*buffer.getNumChannels(), input);
+
+    int chan = 0;
+    int samp = 0;
+
+    for (size_t n = 0; n < numRead; n++)
+    {
+        
+        if (chan == buffer.getNumChannels())
+        {
+        	samp++;
+            timestamp++;
+            chan = 0;
+        }
+
+        *buffer.getSampleData(chan++, samp) = float(-readBuffer[n]) * getDefaultBitVolts(); // previously 0.035
+
+    }
+
+    nSamples = samplesNeeded;
+
+}
+
+
+void FileReader::setParameter(int parameterIndex, float newValue)
+{
+
+}
+
+
+
+void FileReader::saveCustomParametersToXml(XmlElement* parentElement)
+{
+
+    XmlElement* childNode = parentElement->createNewChildElement("FILENAME");
+    childNode->setAttribute("path", getFile());
+
+}
+
+void FileReader::loadCustomParametersFromXml()
+{
+
+
+    if (parametersAsXml != nullptr)
+    {
+        // use parametersAsXml to restore state 
+
+        forEachXmlChildElement(*parametersAsXml, xmlNode)
+        {
+           if (xmlNode->hasTagName("FILENAME"))
+            {
+                String filepath = xmlNode->getStringAttribute("path");
+               FileReaderEditor* fre = (FileReaderEditor*) getEditor();
+                fre->setFile(filepath);
+
+            }
+        }   
+    }
+
+}
\ No newline at end of file

Source/Processors/FileReader.h

+/*
+    ------------------------------------------------------------------
+
+    This file is part of the Open Ephys GUI
+    Copyright (C) 2013 Open Ephys
+
+    ------------------------------------------------------------------
+
+    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, either 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 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/>.
+
+*/
+
+
+#ifndef __FILEREADER_H_B327D3D2__
+#define __FILEREADER_H_B327D3D2__
+
+
+#include "../../JuceLibraryCode/JuceHeader.h"
+
+#include "GenericProcessor.h"
+
+#define BUFFER_SIZE 102400
+
+/**
+
+  Reads data from a file.
+
+  @see GenericProcessor
+
+*/
+
+class FileReader : public GenericProcessor
+
+{
+public:
+
+    FileReader();
+    ~FileReader();
+
+    void process(AudioSampleBuffer& buffer, MidiBuffer& midiMessages, int& nSamples);
+    void setParameter(int parameterIndex, float newValue);
+
+    AudioProcessorEditor* createEditor();
+
+    bool hasEditor() const
+    {
+        return true;
+    }
+
+    void updateSettings();
+
+    bool isSource()
+    {
+    	return true;
+    }
+
+    void enabledState(bool t);
+
+    float getDefaultSampleRate();
+    int getDefaultNumOutputs();
+    float getDefaultBitVolts();
+
+    void setFile(String fullpath);
+    String getFile();
+
+    void saveCustomParametersToXml(XmlElement* parentElement);
+    void loadCustomParametersFromXml();
+
+private:
+
+	uint64 timestamp;
+
+	int lengthOfInputFile;
+    FILE* input;
+
+    int16 readBuffer[BUFFER_SIZE];
+
+    int bufferSize;
+
+    String filePath;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(FileReader);
+
+};
+
+
+#endif  // __FILEREADER_H_B327D3D2__