SCWaveformView

A blazing fast customizable waveform view. Extract the audio section of an asset (which can be both video or audio) and display a waveform.

The SCWaveformView is optimized to do the less file read possible. When scrolling or displaying another part of the waveform, it will only read whatever it needs to render the new section. It will cache the file data to avoid having to read sections that have been already computed. Furthermore, if it does have to read the file, it will read it by bigger segment to minimize the number of read operations next time the timeRange changes.

Main features:

• Can show a play progress.
• Colors are changeable at runtime without reprocessing the asset.
• Doesn't have to read the whole file if you display only a portion of your audio on screen.
• Scrollable.
• Can set a precision to make the drawing faster on some devices.
• Custom LineWidth so you can have a unique waveform design.
• Support mono and stereo (dual waveforms).

Podfile

If you are using cocoapods, you can use this project with the following Podfile

platform :ios, '7.0'
pod "SCWaveformView"

Example

// Allocating the waveformview
SCWaveformView *waveformView = [[SCWaveformView alloc] init];

// Setting the asset
AVAsset *asset = [AVURLAsset URLAssetWithURL:[NSURL URLWithString:@"blabla.mp3"]];
waveformView.asset = asset;

// Setting the waveform colors
waveformView.normalColor = [UIColor greenColor];
waveformView.progressColor = [UIColor redColor];

// Set the play progress
waveformView.progressTime = CMTimeMakeWithSeconds(5, 10000);

// Show only the first second of your asset
waveformView.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(1, 1));

// Use it inside a scrollView
SCScrollableWaveformView *scrollableWaveformView = [SCScrollableWaveformView new];
scrollableWaveformView.waveformView; // Access the waveformView from there

// Set the precision, 1 being the maximum
waveformView.precision = 0.25; // We are going to render one line per four pixels

// Set the lineWidth so we have some space between the lines
waveformView.lineWidthRatio = 0.5;

// Show stereo if available
waveformView.channelStartIndex = 0;
waveformView.channelEndIndex = 1;

// Show only right channel
waveformView.channelStartIndex = 1;
waveformView.channelEndIndex = 1;

// Add some padding between the channels
waveformView.channelsPadding = 10;