52 lines
1.5 KiB
Swift
52 lines
1.5 KiB
Swift
import Foundation
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struct MP4SampleToChunkBox: MP4BoxConvertible {
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struct Entry: CustomDebugStringConvertible {
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let firstChunk: UInt32
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let samplesPerChunk: UInt32
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let sampleDescriptionIndex: UInt32
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var debugDescription: String {
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Mirror(reflecting: self).debugDescription
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}
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}
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// MARK: MP4BoxConvertible
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var size: UInt32 = 0
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let type: String = "stsc"
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var offset: UInt64 = 0
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var children: [MP4BoxConvertible] = []
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// MARK: MP4SampleToChunkBox
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var entries: [Entry] = []
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}
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extension MP4SampleToChunkBox: 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.readUTF8Bytes(4)
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buffer.position += 4
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let numberOfEntries: UInt32 = try buffer.readUInt32()
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entries.removeAll()
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for _ in 0..<numberOfEntries {
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entries.append(Entry(
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firstChunk: try buffer.readUInt32(),
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samplesPerChunk: try buffer.readUInt32(),
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sampleDescriptionIndex: try buffer.readUInt32()
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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 stsc = MP4Box.Name<MP4SampleToChunkBox>(rawValue: "stsc")
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}
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