recorder/AudioView.m at master · ringw/recorder · GitHub

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//
//	AudioView.m
//	Recorder
//
//	Created by Daniel Ringwalt on 11/29/11.
//

#import "AudioView.h"

const double AUDIO_VIEW_PREVIEW_SIZE = 10.f;

@implementation AudioVolumeView
@dynamic volume, peakVolume;
- (instancetype)initWithFrame:(NSRect)frame {
	self = [super initWithFrame:frame];
	if (self) {
		CGColorRef mainBackgroundColor = CGColorCreateGenericRGB(1, 1, 1, 1);
		CGColorRef peakLayerBackgroundColor = CGColorCreateGenericRGB(1, 0, 0, 1);
		CGColorRef volumeLayerBackgroundColor = CGColorCreateGenericRGB(1, 0, 0, 1);

		self.wantsLayer = YES;
		self.layer.autoresizingMask = kCALayerWidthSizable | kCALayerHeightSizable;
		self.layer.backgroundColor = mainBackgroundColor;
		peakLayer = [CALayer new];
		peakLayer.frame = CGRectMake(1, 0, 2, self.layer.bounds.size.height);
		peakLayer.backgroundColor = peakLayerBackgroundColor;
		volumeLayer = [CALayer new];
		volumeLayer.frame = CGRectMake(0, 0, 1, self.layer.bounds.size.height);
		volumeLayer.backgroundColor = volumeLayerBackgroundColor;
		[self.layer addSublayer: peakLayer];
		[self.layer addSublayer: volumeLayer];

		CFRelease(mainBackgroundColor);
		CFRelease(peakLayerBackgroundColor);
		CFRelease(volumeLayerBackgroundColor);
	}
	return self;
}
- (void)setVolume:(double)_volume {
	volume = _volume;
	CGRect volFrame = volumeLayer.frame;
	volFrame.size.width = self.layer.bounds.size.width * volume;
	volumeLayer.frame = volFrame;
}
- (void)setPeakVolume:(double)_peakVolume {
	peakVolume = _peakVolume;
	CGRect frame = peakLayer.frame;
	frame.origin.x = (self.layer.bounds.size.width - 2) * peakVolume;
	peakLayer.frame = frame;
}
@end

@implementation AudioView
@synthesize position, length, volumeView;
@dynamic recording;

- (instancetype)initWithFrame:(NSRect)frame {
	self = [super initWithFrame:frame];
	if (self) {
		CGColorRef mainBackgroundColor = CGColorCreateGenericRGB(1, 1, 1, 1);
		CGColorRef progressLayerBackgroundColor = CGColorCreateGenericRGB(1, .1, .1, 1);

		progressLayer = [[CALayer alloc] init];
		progressLayer.backgroundColor = progressLayerBackgroundColor;
		self.wantsLayer = YES;
		progressLayer.frame = CGRectMake(0, 0, 1, self.layer.bounds.size.height);
		[self.layer addSublayer: progressLayer];
		self.layer.backgroundColor = mainBackgroundColor;

		CFRelease(mainBackgroundColor);
		CFRelease(progressLayerBackgroundColor);
	}

	return self;
}

- (void)drawRect:(NSRect)dirtyRect {
}

- (void)setIsRecording:(BOOL)recording {
	NSLog(@"recording? %d", recording);
	isRecording = recording;
	if (isRecording) {
		double time = AUDIO_VIEW_PREVIEW_SIZE - length;
		if (time <= 0) {
			progressLayer.frame = self.layer.bounds;
			return;
		}
		CABasicAnimation *progressAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
		progressAnimation.fromValue = [NSValue valueWithRect: NSMakeRect(0, 0,
																		 self.layer.bounds.size.width
																			 * length / AUDIO_VIEW_PREVIEW_SIZE,
																		 self.layer.bounds.size.height)];
		progressAnimation.toValue = [NSValue valueWithRect: NSMakeRect(0, 0,
																	   self.layer.bounds.size.width*2,
																	   self.layer.bounds.size.height)];
		progressAnimation.duration = 5.f;
		progressAnimation.fillMode = kCAFillModeForwards;
		progressAnimation.delegate = self;
		[progressLayer addAnimation: progressAnimation forKey: @"timeAnimate"];
	}
}

- (void)animationDidStop:(CABasicAnimation *)anim finished:(BOOL)flag {
	[CATransaction begin];
	[CATransaction setValue: (id)kCFBooleanTrue forKey: kCATransactionDisableActions];
	[progressLayer setValue: anim.toValue forKey: anim.keyPath];
	[CATransaction commit];
}

- (void)displayPcmSamples: (void *)samples count: (long)count startTime: (double)start endTime: (double)end {
	double average = 0;
	int32_t *pcm = (int32_t *)samples;
	if (start - peakTime > 2) {
		peakTime = start;
		peakAudio = 0;
	}
	int i;
	for (i = 0; i < count; i++) {
		double this = (double)abs(pcm[i]) / INT32_MAX;
		average += this / count;
	}
	if (average > peakAudio) peakAudio = average;
	[CATransaction begin];
	[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
	volumeView.volume = average;
	volumeView.peakVolume = peakAudio;
	[CATransaction commit];
}

@end