CMReadySampleBuffer.copyPCMData() завершается с ошибкой -12731 (kCMSampleBufferError_RequiredParameterMissing). ⇐ IOS

[Anonymous]

Я пытаюсь понять, как использовать новый API вывода Provider в AVAssetReader. В частности, я хочу открыть медиафайл (видео или аудио), извлечь из него звук и записать его обратно в формате PCM. У меня есть следующий код:

Код: Выделить всё

import Foundation
import AVFoundation

enum AudioExtractorError: Error {
case noAudio
case bufferAllocationFailed
}

@available(macOS 26.0, iOS 26.0, *)
class AudioExtractor {

init(fileURL: URL) {
self.fileURL = fileURL
}

func extractAudio(from fileURL: URL, to outputFolder: URL) async throws -> URL {
let asset = AVAsset(url: fileURL)
guard let audioTrack = try await asset.loadTracks(withMediaType: .audio).first else {
throw AudioExtractorError.noAudio
}

let reader = try AVAssetReader(asset: asset)
let outputSettings: [String: Any] = [
AVFormatIDKey: kAudioFormatLinearPCM,
AVLinearPCMIsBigEndianKey: false,
AVLinearPCMBitDepthKey: 32,
AVLinearPCMIsFloatKey: true,
AVLinearPCMIsNonInterleaved: false,
AVNumberOfChannelsKey: 2
]

let trackOutput = AVAssetReaderTrackOutput(track: audioTrack, outputSettings: outputSettings)
let outputProvider = reader.outputProvider(for: trackOutput)

try reader.start()

let outputURL = outputFolder
.appendingPathComponent(UUID().uuidString)
.appendingPathExtension("caf")

let outputFile = try AVAudioFile(forWriting: outputURL, settings: outputSettings)
while let sampleBuffer = try await outputProvider.next() {
guard case let CMSampleBuffer.DynamicContent.dataBuffer(blockBuffer) = sampleBuffer.content else {
continue
}
let blockSampleBuffer = CMReadySampleBuffer(dataBuffer: blockBuffer,
formatDescription: sampleBuffer.formatDescription!,
sampleProperties: sampleBuffer.sampleProperties)

guard let pcmBuffer = AVAudioPCMBuffer(pcmFormat: outputFile.processingFormat, frameCapacity: AVAudioFrameCount(sampleBuffer.sampleCount)) else {
throw AudioExtractorError.bufferAllocationFailed
}
try blockSampleBuffer.copyPCMData(fromRange: 0..

Подробнее здесь: [url]https://stackoverflow.com/questions/79843349/cmreadysamplebuffer-copypcmdata-fails-with-12731-kcmsamplebuffererror-requir[/url]