view Source/TouchKeys/TouchkeyEntropyGenerator.cpp @ 20:dfff66c07936

Lots of minor changes to support building on Visual Studio. A few MSVC-specific #ifdefs to eliminate things Visual Studio doesn't like. This version now compiles on Windows (provided liblo, Juce and pthread are present) but the TouchKeys device support is not yet enabled. Also, the code now needs to be re-checked on Mac and Linux.

/*
  TouchKeys: multi-touch musical keyboard control software
  Copyright (c) 2013 Andrew McPherson

  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/>.
 
  =====================================================================
 
  TouchkeyEntropyGenerator.cpp: generate random TouchKeys data for testing
*/

#include "TouchkeyEntropyGenerator.h"
#include <cstdlib>

TouchkeyEntropyGenerator::TouchkeyEntropyGenerator(PianoKeyboard& keyboard)
: Thread("TouchkeyEntropyGenerator"), keyboard_(keyboard),
  waitableEvent_(true), isRunning_(false),
  keyboardRangeLow_(36), keyboardRangeHigh_(60),
  dataInterval_(milliseconds_to_timestamp(5.0))
{
    srand(time(NULL));
}

// Start the thread handling the scheduling.
void TouchkeyEntropyGenerator::start() {
	if(isRunning_)
		return;
    // Initialize the touch data before starting
    for(int i = 0; i <= 127; i++) {
        clearTouchData(i);
        nextOnOffFrameCount_[i] = abs(rand()) % 8192;
    }
    isRunning_ = true;
    startThread();
}

// Stop the scheduler thread if it is currently running.
void TouchkeyEntropyGenerator::stop() {
	if(!isRunning_)
		return;
    
    // Tell the thread to quit and signal the event it waits on
    signalThreadShouldExit();
    stopThread(-1);
    
	isRunning_ = false;
}

// Run the entropy generator in its own thread
void TouchkeyEntropyGenerator::run() {
    timestamp_type lastDataTime = keyboard_.schedulerCurrentTimestamp();
    timestamp_type currentTime;
    
    while(!threadShouldExit()) {
        // Generate random data at regular intervals
        currentTime = keyboard_.schedulerCurrentTimestamp();
        while(currentTime - lastDataTime < dataInterval_ && !threadShouldExit()) {
            waitableEvent_.wait(1);
            currentTime = keyboard_.schedulerCurrentTimestamp();
        }
        
        for(int i = keyboardRangeLow_; i <= keyboardRangeHigh_; i++) {
            if(touchFrames_[i].count != 0) {
                // This key is on. Check if it should go off; otherwise generate new data
                if(--nextOnOffFrameCount_[i] <= 0) {
                    clearTouchData(i);
                    if(keyboard_.key(i) != 0)
                        keyboard_.key(i)->touchOff(currentTime);
                    nextOnOffFrameCount_[i] = abs(rand()) % 8192;
                }
                else {
                    generateRandomFrame(i);
                    if(keyboard_.key(i) != 0) {
                        KeyTouchFrame copyFrame(touchFrames_[i]);
                        keyboard_.key(i)->touchInsertFrame(copyFrame, currentTime);
                    }
                }
            }
            else {
                // This key is off. Check if it should go on
                if(--nextOnOffFrameCount_[i] <= 0) {
                    generateRandomFrame(i);
                    if(keyboard_.key(i) != 0) {
                        KeyTouchFrame copyFrame(touchFrames_[i]);
                        keyboard_.key(i)->touchInsertFrame(copyFrame, currentTime);
                    }
                    nextOnOffFrameCount_[i] = abs(rand()) % 8192;
                }
            }
        }
    }
    
    // Tell all currently enabled notes to turn off
    for(int i = 0; i < 128; i++) {
        if(touchFrames_[i].count > 0 && keyboard_.key(i) != 0)
            keyboard_.key(i)->touchOff(currentTime);
    }
}

// Clear touch data for a particular key
void TouchkeyEntropyGenerator::clearTouchData(int i) {
    touchFrames_[i].count = 0;
    touchFrames_[i].locH = -1.0;
    touchFrames_[i].nextId = 0;
    for(int j = 0; j < 3; j++) {
        touchFrames_[i].ids[j] = -1;
        touchFrames_[i].locs[j] = -1.0;
        touchFrames_[i].sizes[j] = 0;
    }
    int key = i % 12;
    if(key == 1 || key == 3 || key == 6 || key == 8 || key == 10)
        touchFrames_[i].white = false;
    else
        touchFrames_[i].white = true;
}

// Generate a random frame of touch data on this key
void TouchkeyEntropyGenerator::generateRandomFrame(int key) {
    touchFrames_[key].count = 1;
    touchFrames_[key].locH = (float)abs(rand()) / (float)RAND_MAX;
    touchFrames_[key].locs[0] = (float)abs(rand()) / (float)RAND_MAX;
    touchFrames_[key].sizes[0] = (float)abs(rand()) / (float)RAND_MAX;
}