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Merge pull request #1420 from shogo4405/feature/IOSingleAudioMixer
Add an ON/OFF switch for the multi-track audio mixing feature.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import AVFoundation | ||
| import Foundation | ||
|
|
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| final class IOAudioMixerConvertibleBySingleTrack: IOAudioMixerConvertible { | ||
| var delegate: (any IOAudioMixerDelegate)? | ||
| var inputFormat: AVAudioFormat? | ||
| var settings: IOAudioMixerSettings = .init() | ||
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|
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| private lazy var resampler: IOAudioResampler<IOAudioMixerConvertibleBySingleTrack> = { | ||
| var resampler = IOAudioResampler<IOAudioMixerConvertibleBySingleTrack>() | ||
| resampler.delegate = self | ||
| return resampler | ||
| }() | ||
|
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| func append(_ buffer: CMSampleBuffer, track: UInt8) { | ||
| guard settings.mainTrack == track else { | ||
| return | ||
| } | ||
| resampler.append(buffer) | ||
| } | ||
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| func append(_ buffer: AVAudioPCMBuffer, when: AVAudioTime, track: UInt8) { | ||
| guard settings.mainTrack == track else { | ||
| return | ||
| } | ||
| resampler.append(buffer, when: when) | ||
| } | ||
| } | ||
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| extension IOAudioMixerConvertibleBySingleTrack: IOAudioResamplerDelegate { | ||
| // MARK: IOAudioResamplerDelegate | ||
| func resampler(_ resampler: IOAudioResampler<IOAudioMixerConvertibleBySingleTrack>, didOutput audioFormat: AVAudioFormat) { | ||
| delegate?.audioMixer(self, didOutput: audioFormat) | ||
| } | ||
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| func resampler(_ resampler: IOAudioResampler<IOAudioMixerConvertibleBySingleTrack>, didOutput audioPCMBuffer: AVAudioPCMBuffer, when: AVAudioTime) { | ||
| delegate?.audioMixer(self, didOutput: audioPCMBuffer, when: when) | ||
| } | ||
|
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| func resampler(_ resampler: IOAudioResampler<IOAudioMixerConvertibleBySingleTrack>, errorOccurred error: IOAudioUnitError) { | ||
| delegate?.audioMixer(self, errorOccurred: error) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import Foundation | ||
|
|
||
| /// The util object to get feature flag info. | ||
| public enum FeatureUtil { | ||
| /// A structure that defines the name of a feature. | ||
| public struct Name: RawRepresentable, ExpressibleByStringLiteral { | ||
| // swiftlint:disable:next nesting | ||
| public typealias RawValue = String | ||
| // swiftlint:disable:next nesting | ||
| public typealias StringLiteralType = String | ||
|
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| /// This is a feature to mix multiple audio tracks. For example, it is possible to mix .appAudio and .micAudio from ReplayKit. | ||
| public static let multiTrackMixing: Name = "multiTrackMixing" | ||
|
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| /// The raw type value. | ||
| public let rawValue: String | ||
|
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| /// Create a feature name by rawValue. | ||
| public init(rawValue: String) { | ||
| self.rawValue = rawValue | ||
| } | ||
|
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| /// Create a feature name by stringLiteral. | ||
| public init(stringLiteral value: String) { | ||
| self.rawValue = value | ||
| } | ||
| } | ||
|
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| private static var flags: [String: Bool] = [:] | ||
|
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| /// Whether or not a flag is enabled. | ||
| public static func isEnabled(feature: Name) -> Bool { | ||
| return flags[feature.rawValue] ?? false | ||
| } | ||
|
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| /// Setter for a feature flag. | ||
| public static func setEnabled( | ||
| feature: Name, | ||
| isEnabled: Bool | ||
| ) { | ||
| flags[feature.rawValue] = isEnabled | ||
| } | ||
| } |