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LooperAutoViewController.m
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LooperAutoViewController.m
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//
// LooperAutoViewController.m
// LoopMusic
//
// Created by Johann Gan on 1/21/18.
// Copyright © 2018 Cheng Hann Gan. All rights reserved.
//
#import "LooperAutoViewController.h"
@implementation LooperAutoViewController
@synthesize estimateToggler, initialEstimateView, loopDurationView, loopEndpointView, finder;
- (void)viewDidLoad
{
// Set up subview UI interaction programmatically by their tag within the subview.
[self setupAllUIObjects];
finder = [[LoopFinderAuto alloc] init];
// [finder performFFTSetup]; // TOO SLOW
alreadyLooped = false;
// Default estimate flags/values, display settings
[self disableEstimates];
startEst = finder.t1Estimate;
endEst = finder.t2Estimate;
currentDurationRank = -1;
currentPairRanks = [NSMutableArray new];
originalLoopInfo = @{@"duration":@0U,
@"startFrame":@0U,
@"endFrame":@0U
};
loopFinderResults = @{};
}
// Function to set up all the UI objects in subviews
- (void)setupAllUIObjects
{
[self setupUIObject:initialEstimateView:startEstimateTextField:@selector(closeEstimates:):UIControlEventTouchDown];
[self setupUIObject:initialEstimateView:startEstimateTextField:@selector(updateStartEstValueChanged:):UIControlEventEditingDidEnd];
[self setupUIObject:initialEstimateView:endEstimateTextField:@selector(closeEstimates:):UIControlEventTouchDown];
[self setupUIObject:initialEstimateView:endEstimateTextField:@selector(updateEndEstValueChanged:):UIControlEventEditingDidEnd];
[self setupUIObject:initialEstimateView:startEstimateDecrementButton:@selector(decStartEst:):UIControlEventTouchUpInside];
[self setupUIObject:initialEstimateView:startEstimateIncrementButton:@selector(incStartEst:):UIControlEventTouchUpInside];
[self setupUIObject:initialEstimateView:endEstimateDecrementButton:@selector(decEndEst:):UIControlEventTouchUpInside];
[self setupUIObject:initialEstimateView:endEstimateIncrementButton:@selector(incEndEst:):UIControlEventTouchUpInside];
[self setupUIObject:loopDurationView:previousDurationButton:@selector(prevDuration:):UIControlEventTouchUpInside];
[self setupUIObject:loopDurationView:nextDurationButton:@selector(nextDuration:):UIControlEventTouchUpInside];
[self setupUIObject:loopEndpointView:previousEndpointsButton:@selector(prevEndpoints:):UIControlEventTouchUpInside];
[self setupUIObject:loopEndpointView:nextEndpointsButton:@selector(nextEndpoints:):UIControlEventTouchUpInside];
}
// Helper function to set up a UI object in a subview programmatically
- (void)setupUIObject:(UIView *)subview :(NSInteger)tag :(SEL)actionSelector :(UIControlEvents)event
{
[(UIButton *)[subview viewWithTag:tag] addTarget:self action:actionSelector forControlEvents:event];
}
// Helper function to update the text field of a UI object in a subview.
- (void)updateText:(UIView *)subview :(NSInteger)tag :(NSString *)text
{
id uiObj = (id)[subview viewWithTag:tag];
if ([uiObj respondsToSelector:@selector(setText:)])
{
[uiObj performSelector:@selector(setText:) withObject:text];
}
}
// Essentially a sort of ctor (due to the way this function is called by the LooperParentViewController), but is called every time the view is re-opened, rather than just once when the view controller is instantiated.
- (void)loadPresenter:(LoopMusicViewController *)presenterPtr
{
[super loadPresenter:presenterPtr];
// If swiching from manual to auto, throw out the manual time unless the original loop time was being messed with.
if (currentDurationRank == -1)
{
originalLoopInfo = [self loadCurrentLoopInfo];
[self revertOriginalLoop:nil]; // Call outside of a button press
}
}
// Helper function to return the current loop information from the audio player.
- (NSDictionary *)loadCurrentLoopInfo
{
UInt32 startFrame = [presenter getAudioLoopStartFrame];
UInt32 endFrame = [presenter getAudioLoopEndFrame];
return @{@"duration":[NSNumber numberWithUnsignedInteger:(endFrame - startFrame)],
@"startFrame":[NSNumber numberWithUnsignedInteger:startFrame],
@"endFrame":[NSNumber numberWithUnsignedInteger:endFrame]
};
}
// Helper to display "No results" alert
- (void)displayNoResultsAlert
{
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Error" message:@"No loop points found!" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *okayButton = [UIAlertAction actionWithTitle:@"Okay" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
[alert dismissViewControllerAnimated:YES completion:nil]; }];
[alert addAction:okayButton];
[self presentViewController:alert animated:YES completion:nil];
}
- (IBAction)findLoop:(id)sender
{
NSDictionary *results;
long numResults = 0;
if (!alreadyLooped) // Don't rerun if the song has already been looped under the same settings
{
results = [finder findLoop:[presenter getAudioData]];
numResults = [results[@"baseDurations"] count];
}
if (numResults > 0)
{
loopFinderResults = results; // Store the results internally
currentDurationRank = 0;
[currentPairRanks removeAllObjects];
for (int i = 0; i < numResults; ++i)
{
[currentPairRanks addObject:@0];
}
[self updateAllResults];
}
else if (!alreadyLooped)
[self displayNoResultsAlert];
alreadyLooped = true; // Don't loop again under the same settings
}
- (IBAction)toggleEstimates:(id)sender
{
useEstimates = self.estimateToggler.isOn;
// Settings have changed, so enable loop algorithm to execute again
alreadyLooped = false;
if (useEstimates)
[self enableEstimates];
else
[self disableEstimates];
}
- (void)enableEstimates
{
initialEstimateView.alpha = 1;
[initialEstimateView setUserInteractionEnabled:YES];
// Restore estimates to the finder
finder.t1Estimate = startEst;
finder.t2Estimate = endEst;
}
- (void)disableEstimates
{
initialEstimateView.alpha = 0.25;
[initialEstimateView setUserInteractionEnabled:NO];
// So the no-estimate algorithm will run
finder.t1Estimate = -1;
finder.t2Estimate = -1;
[self closeEstimates:nil]; // Call closeEstimates outside of an action by just passing nil as the sender.
}
- (IBAction)closeEstimates:(id)sender
{
[sender resignFirstResponder];
}
- (void)setStartEstimate:(double)est
{
if (est < 0)
est = 0;
else if (endEst != -1 && est > endEst)
est = endEst;
else if (est > [presenter getAudioDuration])
est = [presenter getAudioDuration];
startEst = est;
finder.t1Estimate = startEst;
[self updateText:initialEstimateView :startEstimateTextField :[NSString stringWithFormat:@"%.6f", startEst]];
// Settings have changed, so enable loop algorithm to execute again
alreadyLooped = false;
}
- (void)resetStartEstimate
{
startEst = -1;
finder.t1Estimate = startEst;
[self updateText:initialEstimateView :startEstimateTextField :@""];
// Settings have changed, so enable loop algorithm to execute again
alreadyLooped = false;
}
- (void)setEndEstimate:(double)est
{
if (est < 0)
est = 0;
else if (startEst != -1 && est < startEst)
est = startEst;
else if (est > [presenter getAudioDuration])
est = [presenter getAudioDuration];
endEst = est;
finder.t2Estimate = endEst;
[self updateText:initialEstimateView :endEstimateTextField :[NSString stringWithFormat:@"%.6f", endEst]];
// Settings have changed, so enable loop algorithm to execute again
alreadyLooped = false;
}
- (void)resetEndEstimate
{
endEst = -1;
finder.t2Estimate = endEst;
[self updateText:initialEstimateView :endEstimateTextField :@""];
// Settings have changed, so enable loop algorithm to execute again
alreadyLooped = false;
}
- (void)incStartEst:(id)sender
{
[self setStartEstimate:(startEst + 0.001)];
}
- (void)decStartEst:(id)sender
{
[self setStartEstimate:(startEst - 0.001)];
}
- (void)incEndEst:(id)sender
{
if (endEst == -1)
{
[self setEndEstimate:[presenter getAudioDuration]];
}
else
{
[self setEndEstimate:(endEst + 0.001)];
}
}
- (void)decEndEst:(id)sender
{
if (endEst == -1)
{
[self setEndEstimate:[presenter getAudioDuration]];
}
else
{
[self setEndEstimate:(endEst - 0.001)];
}
}
- (IBAction)updateStartEstValueChanged:(id)sender
{
NSString *text = ((UITextField *)sender).text;
NSScanner *scan = [NSScanner scannerWithString:text];
double doubleVal;
if ([scan scanDouble:&doubleVal] && [scan isAtEnd])
{
[self setStartEstimate:doubleVal];
}
else
{
// If invalid and not empty, try to fall back on the previous estimate.
if([text isEqualToString:@""] || startEst == -1)
{
[self resetStartEstimate];
}
else
{
[self setStartEstimate:startEst];
}
}
}
- (IBAction)updateEndEstValueChanged:(id)sender
{
NSString *text = ((UITextField *)sender).text;
NSScanner *scan = [NSScanner scannerWithString:text];
double doubleVal;
if ([scan scanDouble:&doubleVal] && [scan isAtEnd])
{
[self setEndEstimate:doubleVal];
}
else
{
// If invalid and not empty, try to fall back on the previous estimate.
if([text isEqualToString:@""] || endEst == -1)
{
[self resetEndEstimate];
}
else
{
[self setEndEstimate:endEst];
}
}
}
- (IBAction)revertOriginalLoop:(id)sender
{
currentDurationRank = -1;
[self updateAllResults];
}
- (IBAction)prevDuration:(id)sender
{
currentDurationRank--;
[self updateAllResults];
}
- (IBAction)nextDuration:(id)sender
{
currentDurationRank++;
[self updateAllResults];
}
- (IBAction)prevEndpoints:(id)sender
{
currentPairRanks[currentDurationRank] = [NSNumber numberWithLong:[currentPairRanks[currentDurationRank] integerValue] - 1];
[self updateAllEndpointResults];
}
- (IBAction)nextEndpoints:(id)sender
{
currentPairRanks[currentDurationRank] = [NSNumber numberWithLong:[currentPairRanks[currentDurationRank] integerValue] + 1];
[self updateAllEndpointResults];
}
// Helper function to update all results-related display and storage for a for a given duration rank.
- (void)updateAllResults
{
[self updateLoop:currentDurationRank];
[self updateResultsDisplay:currentDurationRank];
[self updateResultScrollButtons];
}
// Like updateAllResults, but doesn't update the loop duration view.
- (void)updateAllEndpointResults
{
[self updateLoop:currentDurationRank];
[self updateEndpointsDisplay:currentDurationRank];
[self updateEndpointScrollButtons];
}
// Helper function to update the loop point in the DB.
- (void)updateLoop:(NSInteger)durationRank
{
if (durationRank == -1)
{
[self setLoopStart:[AudioPlayer frameToTime:(UInt32)[[originalLoopInfo objectForKey:@"startFrame"] unsignedIntegerValue]]];
[self setLoopEnd:[AudioPlayer frameToTime:(UInt32)[[originalLoopInfo objectForKey:@"endFrame"] unsignedIntegerValue]]];
}
else
{
NSInteger endpointsRank = [currentPairRanks[durationRank] integerValue];
[self setLoopStart:[AudioPlayer frameToTime:(UInt32)[[loopFinderResults objectForKey:@"startFrames"][durationRank][endpointsRank] unsignedIntegerValue]]];
[self setLoopEnd:[AudioPlayer frameToTime:(UInt32)[[loopFinderResults objectForKey:@"endFrames"][durationRank][endpointsRank] unsignedIntegerValue]]];
}
}
// Helper functions to enable/disable the result scrolling buttons as needed
- (void)updateResultScrollButtons
{
[self updatePreviousDurationButton];
[self updateNextDurationButton];
[self updateEndpointScrollButtons];
}
// Updates only the endpoint scroll buttons.
- (void)updateEndpointScrollButtons
{
[self updatePreviousEndpointsButton];
[self updateNextEndpointsButton];
}
- (void)updatePreviousDurationButton
{
// Disable at -1, since that's the original loop point.
if (currentDurationRank < 0)
{
[self disableButton:loopDurationView:previousDurationButton];
}
else
{
[self enableButton:loopDurationView:previousDurationButton];
}
}
- (void)updateNextDurationButton
{
if (currentDurationRank >= (NSInteger)[[loopFinderResults objectForKey:@"baseDurations"] count] - 1)
{
[self disableButton:loopDurationView:nextDurationButton];
}
else
{
[self enableButton:loopDurationView:nextDurationButton];
}
}
- (void)updatePreviousEndpointsButton
{
if (currentDurationRank < 0 || [currentPairRanks[currentDurationRank] integerValue] <= 0)
{
[self disableButton:loopEndpointView:previousEndpointsButton];
}
else
{
[self enableButton:loopEndpointView:previousEndpointsButton];
}
}
- (void)updateNextEndpointsButton
{
if (currentDurationRank < 0 || [currentPairRanks[currentDurationRank] integerValue] >= (NSInteger)[[loopFinderResults objectForKey:@"startFrames"][currentDurationRank] count] - 1)
{
[self disableButton:loopEndpointView:nextEndpointsButton];
}
else
{
[self enableButton:loopEndpointView:nextEndpointsButton];
}
}
// Helper functions to enable/disable a button in a subview programmatically
- (void)enableButton:(UIView *)subview :(NSInteger)tag
{
UIButton *button = (UIButton* )([subview viewWithTag:tag]);
button.alpha = 1;
[button setUserInteractionEnabled:YES];
}
- (void)disableButton:(UIView *)subview :(NSInteger)tag
{
UIButton *button = (UIButton* )([subview viewWithTag:tag]);
button.alpha = 0.35;
[button setUserInteractionEnabled:NO];
}
// Helper function to display the current loop results.
- (void)updateResultsDisplay:(NSInteger)durationRank
{
[self updateDurationDisplay:durationRank];
[self updateEndpointsDisplay:durationRank];
}
// Helper function to display the currentDuration
- (void)updateDurationDisplay:(NSInteger)durationRank
{
if (durationRank == -1) // Original loop
{
[self updateText:loopDurationView:durationRankLabel:@"Rank: Original Loop"];
[self updateText:loopDurationView:durationConfidenceLabel:@"Confidence: ---"];
[self setDurationLabel:(UInt32)[[originalLoopInfo objectForKey:@"duration"] unsignedIntegerValue]];
}
else
{
[self updateText:loopDurationView:durationRankLabel:[NSString stringWithFormat:@"Rank: %li", 1+durationRank]];
[self updateText:loopDurationView:durationConfidenceLabel:[NSString stringWithFormat:@"Confidence: %.2f%%", 100*[[loopFinderResults objectForKey:@"confidences"][durationRank] doubleValue]]];
[self setDurationLabel:(UInt32)[[loopFinderResults objectForKey:@"baseDurations"][durationRank] unsignedIntegerValue]];
}
}
// Helper function to display the an endpoint pair of a duration of some rank.
- (void)updateEndpointsDisplay:(NSInteger)durationRank
{
if (durationRank == -1) // Original loop
{
[self updateText:loopEndpointView:endpointsRankLabel:@"Rank: Original Loop"];
[self setStartEndpointLabel:(UInt32)[[originalLoopInfo objectForKey:@"startFrame"] unsignedIntegerValue]];
[self setEndEndpointLabel:(UInt32)[[originalLoopInfo objectForKey:@"endFrame"] unsignedIntegerValue]];
}
else
{
NSInteger endpointsRank = [currentPairRanks[durationRank] integerValue];
[self updateText:loopEndpointView:endpointsRankLabel:[NSString stringWithFormat:@"Rank: %li.%li", 1+durationRank, 1+endpointsRank]];
if ([loopFinderResults[@"startFrames"][durationRank] count] > 0)
{
[self setStartEndpointLabel:(UInt32)[[loopFinderResults objectForKey:@"startFrames"][durationRank][endpointsRank] unsignedIntegerValue]];
[self setEndEndpointLabel:(UInt32)[[loopFinderResults objectForKey:@"endFrames"][durationRank][endpointsRank] unsignedIntegerValue]];
}
else
{
[self updateText:loopEndpointView:startEndpointLabel:@"Start: None found."];
[self updateText:loopEndpointView:endEndpointLabel:@"End: None found."];
}
}
}
// Helper functions to change the time quantity labels from frame values.
- (void)setDurationLabel:(UInt32)frameDuration
{
[self updateText:loopDurationView:durationLabel:[NSString stringWithFormat:@"Duration: %.6fs", [AudioPlayer frameToTime:frameDuration]]];
}
- (void)setStartEndpointLabel:(UInt32)frameStart
{
[self updateText:loopEndpointView:startEndpointLabel:[NSString stringWithFormat:@"Start: %.6fs", [AudioPlayer frameToTime:frameStart]]];
}
- (void)setEndEndpointLabel:(UInt32)frameEnd
{
[self updateText:loopEndpointView:endEndpointLabel:[NSString stringWithFormat:@"End: %.6fs", [AudioPlayer frameToTime:frameEnd]]];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"OpenAdvancedLoopingSettings"])
{
// Reset the flag so that the looping algorithm gets executed again
alreadyLooped = false;
// Pass the loop finder object to the settings controller for settings modification.
UINavigationController *navigationController = segue.destinationViewController;
LooperSettingsMenuTableViewController *menuVC = navigationController.viewControllers[0];
menuVC.finder = finder;
}
}
- (void)loadFFTSetup:(FFTSetup)setup :(unsigned long)n
{
finder.fftSetup = setup;
finder.nSetup = n;
}
- (void)saveFFTSetup:(LoopMusicViewController *)mainScreen
{
// If a larger setup was made
if (finder.nSetup > mainScreen.nSetup)
{
// This seems to act like a pointer. If you destroy the FFT setup with one and try to access the other, a bad access occurs.
mainScreen.fftSetup = finder.fftSetup;
mainScreen.nSetup = finder.nSetup;
}
}
@end