From 5303930fc9f8f33bc5e8b314f0f03716c2ad8860 Mon Sep 17 00:00:00 2001
From: jsiegle <jsiegle@mit.edu>
Date: Tue, 21 May 2013 21:33:10 -0400
Subject: [PATCH] Add source code for FileReader
---
Source/Processors/FileReader.cpp | 201 +++++++++++++++++++++++++++++++
Source/Processors/FileReader.h | 98 +++++++++++++++
2 files changed, 299 insertions(+)
create mode 100644 Source/Processors/FileReader.cpp
create mode 100644 Source/Processors/FileReader.h
diff --git a/Source/Processors/FileReader.cpp b/Source/Processors/FileReader.cpp
new file mode 100644
index 000000000..8b9939f30
--- /dev/null
+++ b/Source/Processors/FileReader.cpp
@@ -0,0 +1,201 @@
+/*
+ ------------------------------------------------------------------
+
+ 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, ×tamp, 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
diff --git a/Source/Processors/FileReader.h b/Source/Processors/FileReader.h
new file mode 100644
index 000000000..38e5c6974
--- /dev/null
+++ b/Source/Processors/FileReader.h
@@ -0,0 +1,98 @@
+/*
+ ------------------------------------------------------------------
+
+ 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__
--
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