ZLHistogramAudioPlot

A hardware-accelerated audio visualization view using EZAudio, inspired by AudioCopy. ZLHistogramAudioPlot was originally developed for Murmur.

Preview

###Buffer

###Rolling

CocoaPods

You can install ZLHistogramAudioPlot through CocoaPods adding the following to your Podfile:

pod 'ZLHistogramAudioPlot'

Usage

Checkout the demo app for an example.

Customizable attributes:

/// The upper bound of the frequency range the audio plot will display. Default:
/// 10000Hz
@property (nonatomic) float maxFrequency;

/// The lower bound of the frequency range the audio plot will display. Default:
/// 1200Hz
@property (nonatomic) float minFrequency;

/// The number of bins in the audio plot. Default: 30
@property (nonatomic) NSUInteger numOfBins;

/// The padding of each bin in percent width. Default: 0.1
@property (nonatomic) CGFloat padding;

/// The gain applied to the height of each bin. Default: 10
@property (nonatomic) CGFloat gain;

/// A float that specifies the vertical gravitational acceleration applied to
/// each bin. Default: 10 pixel/sec^2
@property (nonatomic) float gravity;

/// The color of all bins in the audio plot.
@property (strong, nonatomic) UIColor *color;

/// An array of color objects defining the color of each bin in the audio plot.
/// If not set, the color attribute will be used instead. Currently only
/// supported by plot type EZPlotTypeBuffer.
@property (strong, nonatomic) NSArray *colors;

Dependencies

• ZLHistogramAudioPlot is a subclass of EZAudioPlot. It requires EZAudio.
• It also requires Accelerate framework for hardware acceleration.

Compatibilty

ZLHistogramAudioPlot uses the following interface provided by EZAudio to get audio data:

- (void)updateBuffer:(float *)buffer withBufferSize:(UInt32)bufferSize;

It can be easily modified to work with Audio Unit and Core Audio.

Requirements

• iOS 6 or higher.
• Automatic Reference Counting (ARC).

License

ZLHistogramAudioPlot is available under the MIT license. See the LICENSE file for more info.