63 lines
1.9 KiB
Swift
63 lines
1.9 KiB
Swift
import Foundation
|
|
|
|
/// ISO/IEC 14496-12 5th 8.7.3.2.1
|
|
struct MP4SampleSizeBox: MP4FullBox {
|
|
// MARK: MP4FullBox
|
|
var size: UInt32 = 0
|
|
let type: String = "stsz"
|
|
var offset: UInt64 = 0
|
|
var children: [MP4BoxConvertible] = []
|
|
var version: UInt8 = 0
|
|
var flags: UInt32 = 0
|
|
// MARK: MP4SampleSizeBox
|
|
var sampleSize: UInt32 = 0
|
|
var entries: [UInt32] = []
|
|
}
|
|
|
|
extension MP4SampleSizeBox: DataConvertible {
|
|
var data: Data {
|
|
get {
|
|
let buffer = ByteArray()
|
|
.writeUInt32(size)
|
|
.writeUTF8Bytes(type)
|
|
.writeUInt8(version)
|
|
.writeUInt24(flags)
|
|
.writeUInt32(sampleSize)
|
|
.writeUInt32(UInt32(entries.count))
|
|
for entry in entries {
|
|
buffer
|
|
.writeUInt32(entry)
|
|
}
|
|
let size = buffer.position
|
|
buffer.position = 0
|
|
buffer.writeUInt32(UInt32(size))
|
|
return buffer.data
|
|
}
|
|
set {
|
|
do {
|
|
let buffer = ByteArray(data: newValue)
|
|
size = try buffer.readUInt32()
|
|
_ = try buffer.readUTF8Bytes(4)
|
|
version = try buffer.readUInt8()
|
|
flags = try buffer.readUInt24()
|
|
sampleSize = try buffer.readUInt32()
|
|
entries.removeAll()
|
|
let numberOfEntries = try buffer.readUInt32()
|
|
if sampleSize == 0 {
|
|
for _ in 0..<numberOfEntries {
|
|
entries.append(try buffer.readUInt32())
|
|
}
|
|
} else {
|
|
entries.append(sampleSize)
|
|
}
|
|
} catch {
|
|
logger.error(error)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
extension MP4Box.Names {
|
|
static let stsz = MP4Box.Name<MP4SampleSizeBox>(rawValue: "stsz")
|
|
}
|