74 lines
2.3 KiB
Swift
74 lines
2.3 KiB
Swift
import Foundation
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/// ISO/IEC 14496-12 5th 8.8.8.2
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struct MP4TrackRunBox: MP4FullBox {
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struct Sample {
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var duration: UInt32?
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var size: UInt32?
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var flags: UInt32?
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var compositionTimeOffset: Int32?
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}
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enum Field: UInt32 {
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case dataOffset = 0x000001
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case firstSampleFlags = 0x000004
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case sampleDuration = 0x000100
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case sampleSize = 0x000200
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case sampleFlags = 0x000400
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case sampleCompositionTimeOffset = 0x000800
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}
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// MARK: MP4FullBox
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var size: UInt32 = 0
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let type: String = "trun"
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var offset: UInt64 = 0
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var children: [MP4BoxConvertible] = []
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var version: UInt8 = 0
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var flags: UInt32 = 0
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// MARK: MP4TrackRunBox
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var dataOffset: Int32 = 0
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var firstSampleFlags: UInt32 = 0
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var samples: [Sample] = []
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private func contains(_ value: Field) -> Bool {
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return (flags & value.rawValue) != 0
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}
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}
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extension MP4TrackRunBox: 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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_ = try buffer.readBytes(4)
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version = try buffer.readUInt8()
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flags = try buffer.readUInt24()
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let sampleCount: UInt32 = try buffer.readUInt32()
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if contains(.dataOffset) {
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dataOffset = try buffer.readInt32()
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}
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if contains(.firstSampleFlags) {
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firstSampleFlags = try buffer.readUInt32()
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}
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samples.removeAll()
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for _ in 0..<sampleCount {
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samples.append(Sample(
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duration: contains(.sampleDuration) ? try buffer.readUInt32() : nil,
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size: contains(.sampleSize) ? try buffer.readUInt32() : nil,
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flags: contains(.sampleFlags) ? try buffer.readUInt32() : nil,
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compositionTimeOffset: contains(.sampleCompositionTimeOffset) ? try buffer.readInt32() : nil
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))
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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 trun = MP4Box.Name<MP4TrackRunBox>(rawValue: "trun")
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}
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