Nick Payne
55 lines
2.0 KiB
Swift
55 lines
2.0 KiB
Swift
import AudioToolbox
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import CoreAudio
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import Foundation
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public class AudioFormatManager {
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public static func getDeviceFormat(deviceID: AudioObjectID) -> AudioStreamBasicDescription {
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var propertyAddress = getPropertyAddress(
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selector: kAudioDevicePropertyStreamFormat,
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scope: kAudioDevicePropertyScopeInput)
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var propertySize = UInt32(MemoryLayout<AudioStreamBasicDescription>.stride)
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var streamFormat = AudioStreamBasicDescription()
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let status = AudioObjectGetPropertyData(
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deviceID, &propertyAddress, 0, nil, &propertySize, &streamFormat)
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guard status == noErr else {
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fatalError("Failed to get stream format: \(status)")
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}
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return streamFormat
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}
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static func createMetadata(for format: AudioStreamBasicDescription) -> AudioStreamMetadata {
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return AudioStreamMetadata(
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sampleRate: format.mSampleRate,
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channelsPerFrame: format.mChannelsPerFrame,
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bitsPerChannel: format.mBitsPerChannel,
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isFloat: format.mFormatFlags & kAudioFormatFlagIsFloat != 0,
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captureMode: "audio",
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deviceName: nil, // TODO: Get device name if needed
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deviceUID: nil, // TODO: Get device UID if needed
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encoding: format.mFormatFlags & kAudioFormatFlagIsFloat != 0 ? "pcm_f32le" : "pcm_s16le"
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)
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}
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public static func writeMetadata(for format: AudioStreamBasicDescription) {
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let metadata = createMetadata(for: format)
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Logger.writeMessage(.metadata, data: metadata)
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Logger.writeMessage(.streamStart, data: Optional<String>.none)
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}
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public static func logFormatInfo(_ format: AudioStreamBasicDescription) {
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Logger.debug(
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"Using device's native format",
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context: [
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"channels": String(format.mChannelsPerFrame),
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"sample_rate": String(format.mSampleRate),
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"bits_per_channel": String(format.mBitsPerChannel),
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"format_id": String(format.mFormatID),
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"format_flags": String(format: "0x%08x", format.mFormatFlags),
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"bytes_per_frame": String(format.mBytesPerFrame),
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]
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)
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}
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}
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