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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // | ||
| // MultiPlayer+Export.swift | ||
| // Trackomatic | ||
| // | ||
| // Created by Tom Cowland on 07/03/2020. | ||
| // Copyright © 2020 Tom Cowland. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import AVFoundation | ||
|
|
||
| extension MultiPlayer { | ||
|
|
||
| // MARK: - Export current mix | ||
|
|
||
| func aiffSettings() -> [ String: Any ] | ||
| { | ||
| var settings: [ String: Any ] = [:]; | ||
| settings[ AVFormatIDKey ] = kAudioFormatLinearPCM; | ||
| settings[ AVSampleRateKey ] = audioFormat.sampleRate; | ||
| settings[ AVNumberOfChannelsKey ] = audioFormat.channelCount; | ||
| settings[ AVLinearPCMBitDepthKey ] = 24; | ||
| return settings; | ||
| } | ||
|
|
||
| func renderTo( output url: URL, settings: [ String: Any ] ) | ||
| { | ||
| engine.stop(); | ||
|
|
||
| do { | ||
| let maxFrames: AVAudioFrameCount = 4096; | ||
| try engine.enableManualRenderingMode( .offline, format: audioFormat, maximumFrameCount: maxFrames ); | ||
| try engine.start(); | ||
| play( atFrame: 0, offline: true ); | ||
| } catch { | ||
| fatalError("Enabling manual rendering mode failed: \(error).") | ||
| } | ||
|
|
||
| let buffer = AVAudioPCMBuffer( | ||
| pcmFormat: engine.manualRenderingFormat, | ||
| frameCapacity: engine.manualRenderingMaximumFrameCount | ||
| )! | ||
|
|
||
| let outputFile: AVAudioFile | ||
| do { | ||
| outputFile = try AVAudioFile( | ||
| forWriting: url, | ||
| settings: settings | ||
| ); | ||
| } catch { | ||
| print("Unable to open output audio file: \(error).") | ||
| return; | ||
| } | ||
|
|
||
| while engine.manualRenderingSampleTime < length | ||
| { | ||
| do | ||
| { | ||
| let frameCount = length - engine.manualRenderingSampleTime; | ||
| let framesToRender = min( AVAudioFrameCount(frameCount), buffer.frameCapacity ); | ||
|
|
||
| let status = try engine.renderOffline( framesToRender, to: buffer ); | ||
|
|
||
| switch status { | ||
|
|
||
| case .success: | ||
| // The data rendered successfully. Write it to the output file. | ||
| try outputFile.write( from: buffer ); | ||
|
|
||
| case .insufficientDataFromInputNode: | ||
| // Applicable only when using the input node as one of the sources. | ||
| break | ||
|
|
||
| case .cannotDoInCurrentContext: | ||
| // The engine couldn't render in the current render call. | ||
| // Retry in the next iteration. | ||
| break | ||
|
|
||
| case .error: | ||
| // An error occurred while rendering the audio. | ||
| fatalError("The manual rendering failed."); | ||
|
|
||
| @unknown default: | ||
| break; | ||
| } | ||
|
|
||
| } catch { | ||
| print("The manual rendering failed: \(error)."); | ||
| } | ||
| } | ||
|
|
||
| // Stop the player node and engine. | ||
| stop(); | ||
| engine.stop() | ||
|
|
||
| engine.disableManualRenderingMode(); | ||
|
|
||
| do | ||
| { | ||
| try engine.start(); | ||
| } | ||
| catch | ||
| { | ||
| print("Unable to restart audio engine: \(error)."); | ||
| } | ||
| } | ||
|
|
||
| } |
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