53 lines
1.7 KiB
Swift
53 lines
1.7 KiB
Swift
import Foundation
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struct MP4AudioSampleEntry: MP4SampleEntry {
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static let channelCount: UInt16 = 2
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static let sampleSize: UInt16 = 16
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// MARK: MP4SampleEntry
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var size: UInt32 = 0
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var type: String = ""
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var offset: UInt64 = 0
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var children: [MP4BoxConvertible] = []
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var dataReferenceIndex: UInt16 = 0
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// MARK: MP4AudioSampleEntry
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var channelCount: UInt16 = Self.channelCount
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var sampleSize: UInt16 = Self.sampleSize
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var sampleRate: UInt32 = 0
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}
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extension MP4AudioSampleEntry: DataConvertible {
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var data: Data {
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get {
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Data()
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}
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set {
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do {
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let buffer = ByteArray(data: newValue)
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size = try buffer.readUInt32()
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type = try buffer.readUTF8Bytes(4)
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buffer.position += 16
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channelCount = try buffer.readUInt16()
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sampleSize = try buffer.readUInt16()
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buffer.position += 4
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sampleRate = try buffer.readUInt32() >> 16
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children.removeAll()
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while 0 < buffer.bytesAvailable {
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let size = try buffer.readUInt32()
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_ = try buffer.readUTF8Bytes(4)
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buffer.position -= 8
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var entry = MP4Box()
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entry.data = try buffer.readBytes(Int(size))
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children.append(entry)
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}
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} catch {
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logger.error(error)
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}
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}
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}
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}
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extension MP4Box.Names {
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static let mp4a = MP4Box.Name<MP4AudioSampleEntry>(rawValue: "mp4a")
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static let mlpa = MP4Box.Name<MP4AudioSampleEntry>(rawValue: "mlpa")
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}
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