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cog/SpectrumViewCG.m

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//
// SpectrumViewCG.m
// Cog
//
// Created by Christopher Snowhill on 2/12/22.
//
#import "SpectrumViewCG.h"
#import "NSView+Visibility.h"
#import "analyzer.h"
#define LOWER_BOUND -80
static void *kSpectrumViewCGContext = &kSpectrumViewCGContext;
extern NSString *CogPlaybackDidBeginNotficiation;
extern NSString *CogPlaybackDidPauseNotficiation;
extern NSString *CogPlaybackDidResumeNotficiation;
extern NSString *CogPlaybackDidStopNotficiation;
@interface SpectrumViewCG () {
VisualizationController *visController;
NSTimer *timer;
float saLowerBound;
BOOL paused;
BOOL stopped;
BOOL isListening;
BOOL observersAdded;
BOOL isFullView;
NSRect initFrame;
NSDictionary *textAttrs;
NSColor *baseColor;
NSColor *peakColor;
NSColor *backgroundColor;
NSColor *borderColor;
ddb_analyzer_t _analyzer;
ddb_analyzer_draw_data_t _draw_data;
float visAudio[4096], visFFT[2048];
}
@end
@implementation SpectrumViewCG
@synthesize isListening;
- (id)initWithFrame:(NSRect)frame {
self = [super initWithFrame:frame];
if(self) {
initFrame = frame;
[self setup];
}
return self;
}
- (void)updateVisListening {
if(self.isListening && (![self visibleInWindow] || paused || stopped)) {
[self stopTimer];
self.isListening = NO;
} else if(!self.isListening && ([self visibleInWindow] && !stopped && !paused)) {
[self startTimer];
self.isListening = YES;
}
}
- (void)setup {
visController = [NSClassFromString(@"VisualizationController") sharedController];
timer = nil;
stopped = YES;
paused = NO;
isListening = NO;
saLowerBound = LOWER_BOUND;
[self colorsDidChange:nil];
BOOL freqMode = [[NSUserDefaults standardUserDefaults] boolForKey:@"spectrumFreqMode"];
ddb_analyzer_init(&_analyzer);
_analyzer.db_lower_bound = LOWER_BOUND;
_analyzer.min_freq = 10;
_analyzer.max_freq = 22000;
_analyzer.peak_hold = 10;
_analyzer.view_width = 64;
_analyzer.fractional_bars = 1;
_analyzer.octave_bars_step = 2;
_analyzer.max_of_stereo_data = 1;
_analyzer.freq_is_log = 0;
_analyzer.mode = freqMode ? DDB_ANALYZER_MODE_FREQUENCIES : DDB_ANALYZER_MODE_OCTAVE_NOTE_BANDS;
[self addObservers];
}
- (void)enableFullView {
isFullView = YES;
_analyzer.freq_is_log = 1;
[self repaint];
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary<NSKeyValueChangeKey, id> *)change
context:(void *)context {
if(context == kSpectrumViewCGContext) {
if([keyPath isEqualToString:@"self.window.visible"]) {
[self updateVisListening];
} else {
[self colorsDidChange:nil];
}
} else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
- (void)addObservers {
if(!observersAdded) {
[[NSUserDefaultsController sharedUserDefaultsController] addObserver:self forKeyPath:@"values.spectrumBarColor" options:0 context:kSpectrumViewCGContext];
[[NSUserDefaultsController sharedUserDefaultsController] addObserver:self forKeyPath:@"values.spectrumDotColor" options:0 context:kSpectrumViewCGContext];
[self addObserver:self forKeyPath:@"self.window.visible" options:0 context:kSpectrumViewCGContext];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(colorsDidChange:)
name:NSSystemColorsDidChangeNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playbackDidBegin:)
name:CogPlaybackDidBeginNotficiation
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playbackDidPause:)
name:CogPlaybackDidPauseNotficiation
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playbackDidResume:)
name:CogPlaybackDidResumeNotficiation
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playbackDidStop:)
name:CogPlaybackDidStopNotficiation
object:nil];
observersAdded = YES;
}
}
- (void)dealloc {
ddb_analyzer_dealloc(&_analyzer);
ddb_analyzer_draw_data_dealloc(&_draw_data);
[self removeObservers];
}
- (void)removeObservers {
if(observersAdded) {
[[NSUserDefaultsController sharedUserDefaultsController] removeObserver:self forKeyPath:@"values.spectrumBarColor" context:kSpectrumViewCGContext];
[[NSUserDefaultsController sharedUserDefaultsController] removeObserver:self forKeyPath:@"values.spectrumDotColor" context:kSpectrumViewCGContext];
[self removeObserver:self forKeyPath:@"self.window.visible" context:kSpectrumViewCGContext];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:NSSystemColorsDidChangeNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:CogPlaybackDidBeginNotficiation
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:CogPlaybackDidPauseNotficiation
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:CogPlaybackDidResumeNotficiation
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:CogPlaybackDidStopNotficiation
object:nil];
observersAdded = NO;
}
}
- (void)repaint {
self.needsDisplay = YES;
}
- (void)startTimer {
[self stopTimer];
timer = [NSTimer timerWithTimeInterval:1.0 / 60.0
target:self
selector:@selector(timerRun:)
userInfo:nil
repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
}
- (void)stopTimer {
[timer invalidate];
timer = nil;
}
- (void)timerRun:(NSTimer *)timer {
[self repaint];
}
- (void)colorsDidChange:(NSNotification *)notification {
backgroundColor = [NSColor textBackgroundColor];
backgroundColor = [backgroundColor colorWithAlphaComponent:0.0];
borderColor = [NSColor systemGrayColor];
NSValueTransformer *colorToValueTransformer = [NSValueTransformer valueTransformerForName:@"ColorToValueTransformer"];
baseColor = [colorToValueTransformer transformedValue:[[NSUserDefaults standardUserDefaults] dataForKey:@"spectrumBarColor"]];
peakColor = [colorToValueTransformer transformedValue:[[NSUserDefaults standardUserDefaults] dataForKey:@"spectrumDotColor"]];
NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.alignment = NSTextAlignmentLeft;
textAttrs = @{
NSFontAttributeName: [NSFont fontWithName:@"HelveticaNeue" size:10],
NSParagraphStyleAttributeName: paragraphStyle,
NSForegroundColorAttributeName: borderColor
};
[self repaint];
}
- (void)startPlayback {
[self playbackDidBegin:nil];
}
- (void)playbackDidBegin:(NSNotification *)notification {
stopped = NO;
paused = NO;
[self updateVisListening];
}
- (void)playbackDidPause:(NSNotification *)notification {
stopped = NO;
paused = YES;
[self updateVisListening];
}
- (void)playbackDidResume:(NSNotification *)notification {
stopped = NO;
paused = NO;
[self updateVisListening];
}
- (void)playbackDidStop:(NSNotification *)notification {
stopped = YES;
paused = NO;
[self updateVisListening];
[self repaint];
}
- (void)drawSaGrid {
CGContextRef context = NSGraphicsContext.currentContext.CGContext;
// horz lines, db scale
CGContextSetStrokeColorWithColor(context, borderColor.CGColor);
CGFloat lower = -floor(saLowerBound);
for(int db = 10; db < lower; db += 10) {
CGFloat y = (CGFloat)(db / lower) * NSHeight(self.bounds);
if(y >= NSHeight(self.bounds)) {
break;
}
CGPoint points[] = {
CGPointMake(0, y),
CGPointMake(NSWidth(self.bounds) - 1, y)
};
CGContextAddLines(context, points, 2);
}
CGFloat dash[2] = { 1, 2 };
CGContextSetLineDash(context, 0, dash, 2);
CGContextStrokePath(context);
CGContextSetLineDash(context, 0, NULL, 0);
// db text
for(int db = 10; db < lower; db += 10) {
CGFloat y = (CGFloat)(db / lower) * NSHeight(self.bounds);
if(y >= NSHeight(self.bounds)) {
break;
}
NSString *string = [NSString stringWithFormat:@"%d dB", -db];
[string drawAtPoint:NSMakePoint(0, NSHeight(self.bounds) - y - 12) withAttributes:textAttrs];
}
}
- (void)drawFrequencyLabels {
// octaves text
for(int i = 0; i < _draw_data.label_freq_count; i++) {
if(_draw_data.label_freq_positions < 0) {
continue;
}
NSString *string = [NSString stringWithUTF8String:_draw_data.label_freq_texts[i]];
CGFloat x = _draw_data.label_freq_positions[i];
[string drawAtPoint:NSMakePoint(x, NSHeight(self.bounds) - 12) withAttributes:textAttrs];
}
}
- (void)drawAnalyzerDescreteFrequencies {
CGContextRef context = NSGraphicsContext.currentContext.CGContext;
ddb_analyzer_draw_bar_t *bar = _draw_data.bars;
for(int i = 0; i < _draw_data.bar_count; i++, bar++) {
CGContextMoveToPoint(context, bar->xpos, 0);
CGContextAddLineToPoint(context, bar->xpos, bar->bar_height);
}
CGContextSetStrokeColorWithColor(context, baseColor.CGColor);
CGContextStrokePath(context);
bar = _draw_data.bars;
for(int i = 0; i < _draw_data.bar_count; i++, bar++) {
CGContextMoveToPoint(context, bar->xpos - 0.5, bar->peak_ypos);
CGContextAddLineToPoint(context, bar->xpos + 0.5, bar->peak_ypos);
}
CGContextSetStrokeColorWithColor(context, peakColor.CGColor);
CGContextStrokePath(context);
}
- (void)drawAnalyzerOctaveBands {
CGContextRef context = NSGraphicsContext.currentContext.CGContext;
ddb_analyzer_draw_bar_t *bar = _draw_data.bars;
for(int i = 0; i < _draw_data.bar_count; i++, bar++) {
CGContextAddRect(context, CGRectMake(bar->xpos, 0, _draw_data.bar_width, bar->bar_height));
}
CGContextSetFillColorWithColor(context, baseColor.CGColor);
CGContextFillPath(context);
bar = _draw_data.bars;
for(int i = 0; i < _draw_data.bar_count; i++, bar++) {
CGContextAddRect(context, CGRectMake(bar->xpos, bar->peak_ypos, _draw_data.bar_width, 1.0));
}
CGContextSetFillColorWithColor(context, peakColor.CGColor);
CGContextFillPath(context);
}
- (void)drawAnalyzer {
if(_analyzer.mode == DDB_ANALYZER_MODE_FREQUENCIES) {
[self drawAnalyzerDescreteFrequencies];
} else {
[self drawAnalyzerOctaveBands];
}
}
- (void)drawRect:(NSRect)dirtyRect {
[super drawRect:dirtyRect];
[self updateVisListening];
[backgroundColor setFill];
NSRectFill(dirtyRect);
if(!isFullView) {
CGContextRef context = NSGraphicsContext.currentContext.CGContext;
CGContextMoveToPoint(context, 0.0, 0.0);
CGContextAddLineToPoint(context, initFrame.size.width, 0.0);
CGContextAddLineToPoint(context, initFrame.size.width, initFrame.size.height);
CGContextAddLineToPoint(context, 0.0, initFrame.size.height);
CGContextAddLineToPoint(context, 0.0, 0.0);
CGContextSetStrokeColorWithColor(context, borderColor.CGColor);
CGContextStrokePath(context);
}
if(stopped) return;
if(isFullView) {
_analyzer.view_width = self.bounds.size.width;
}
[self->visController copyVisPCM:&visAudio[0] visFFT:&visFFT[0] latencyOffset:0];
ddb_analyzer_process(&_analyzer, [self->visController readSampleRate] / 2.0, 1, visFFT, 2048);
ddb_analyzer_tick(&_analyzer);
ddb_analyzer_get_draw_data(&_analyzer, self.bounds.size.width, self.bounds.size.height, &_draw_data);
if(isFullView) {
[self drawSaGrid];
[self drawFrequencyLabels];
}
[self drawAnalyzer];
}
- (void)mouseDown:(NSEvent *)event {
BOOL freqMode = ![[NSUserDefaults standardUserDefaults] boolForKey:@"spectrumFreqMode"];
[[NSUserDefaults standardUserDefaults] setBool:freqMode forKey:@"spectrumFreqMode"];
_analyzer.mode = freqMode ? DDB_ANALYZER_MODE_FREQUENCIES : DDB_ANALYZER_MODE_OCTAVE_NOTE_BANDS;
_analyzer.mode_did_change = 1;
[self repaint];
}
@end
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