The associated Xcode project implements a SwiftUI app for macOS and iOS that processes audio samples in a file to plot their decibel levels over time.
Learn more about plotting audio samples from our in-depth blog post.
The subfolder PlotAudio contains a small set of independent files that prepare and display audio data in a specialized interactive view. The remaining files build an app around that functionality.
A list of audio and video files for processing is included in the bundle resources subdirectories Audio Files and Video Files.
Add your own audio and video files or use the sample set provided.
Tap on a file in the list to plot its audio.
Adjust controls for appearance and drag or tap on the audio plot to set play locations.
The core files that implement preparing and plotting audio data in a view:
- DownsampleAudio : The AVFoundation, Accelerate and SwiftUI code that processes audio samples for plotting as a Path with the
PlotAudioFunction. - PlotAudioWaveformView : The View that draws the plot of the processed audio samples.
- PlotAudioObservable : The ObservableObject that handles interacting with the plot such as dragging to set play location via its
PlotAudioDelegate, or updating when necessary.
The PlotAudio folder can be added to other projects to display audio plots of media URL or AVAsset. The Xcode preview of PlotAudioWaveformView is setup to display the audio plots of three included audio files.