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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,88 @@ | ||
| import CoreMedia | ||
| import Foundation | ||
|
|
||
| enum HEVCNALUnitType: UInt8 { | ||
| case unspec = 0 | ||
| case codedSliceTrailN = 0 | ||
| case codedSliceTrailR = 1 | ||
| case codedSliceTsaN = 2 | ||
| case codedSliceTsaR = 3 | ||
| case codedSliceStsaN = 4 | ||
| case codedSliceStsaR = 5 | ||
| case codedSliceRadlN = 6 | ||
| case codedSliceRadlR = 7 | ||
| case codedSliceRaslN = 8 | ||
| case codedSliceRsslR = 9 | ||
| /// 10...15 Reserved | ||
| case vps = 32 | ||
| case sps = 33 | ||
| case pps = 34 | ||
| case accessUnitDelimiter = 35 | ||
| case unspec = 0xFF | ||
| } | ||
|
|
||
| struct HEVCNALUnit: NALUnit, Equatable { | ||
| let type: HEVCNALUnitType | ||
| let temporalIdPlusOne: UInt8 | ||
| let payload: Data | ||
|
|
||
| init(_ data: Data) { | ||
| self.init(data, length: data.count) | ||
| } | ||
|
|
||
| init(_ data: Data, length: Int) { | ||
| self.type = HEVCNALUnitType(rawValue: (data[0] & 0x7e) >> 1) ?? .unspec | ||
| self.temporalIdPlusOne = data[1] & 0b00011111 | ||
| self.payload = data.subdata(in: 2..<length) | ||
| } | ||
|
|
||
| var data: Data { | ||
| var result = Data() | ||
| result.append(type.rawValue << 1) | ||
| result.append(temporalIdPlusOne) | ||
| result.append(payload) | ||
| return result | ||
| } | ||
| } | ||
|
|
||
| extension [HEVCNALUnit] { | ||
| func makeFormatDescription(_ nalUnitHeaderLength: Int32 = 4) -> CMFormatDescription? { | ||
| guard | ||
| let vps = first(where: { $0.type == .vps }), | ||
| let sps = first(where: { $0.type == .sps }), | ||
| let pps = first(where: { $0.type == .pps }) else { | ||
| return nil | ||
| } | ||
| return vps.data.withUnsafeBytes { (vpsBuffer: UnsafeRawBufferPointer) -> CMFormatDescription? in | ||
| guard let vpsBaseAddress = vpsBuffer.baseAddress else { | ||
| return nil | ||
| } | ||
| return sps.data.withUnsafeBytes { (spsBuffer: UnsafeRawBufferPointer) -> CMFormatDescription? in | ||
| guard let spsBaseAddress = spsBuffer.baseAddress else { | ||
| return nil | ||
| } | ||
| return pps.data.withUnsafeBytes { (ppsBuffer: UnsafeRawBufferPointer) -> CMFormatDescription? in | ||
| guard let ppsBaseAddress = ppsBuffer.baseAddress else { | ||
| return nil | ||
| } | ||
| var formatDescriptionOut: CMFormatDescription? | ||
| let pointers: [UnsafePointer<UInt8>] = [ | ||
| vpsBaseAddress.assumingMemoryBound(to: UInt8.self), | ||
| spsBaseAddress.assumingMemoryBound(to: UInt8.self), | ||
| ppsBaseAddress.assumingMemoryBound(to: UInt8.self) | ||
| ] | ||
| let sizes: [Int] = [vpsBuffer.count, spsBuffer.count, ppsBuffer.count] | ||
| let status = CMVideoFormatDescriptionCreateFromHEVCParameterSets( | ||
| allocator: kCFAllocatorDefault, | ||
| parameterSetCount: pointers.count, | ||
| parameterSetPointers: pointers, | ||
| parameterSetSizes: sizes, | ||
| nalUnitHeaderLength: nalUnitHeaderLength, | ||
| extensions: nil, | ||
| formatDescriptionOut: &formatDescriptionOut | ||
| ) | ||
| return formatDescriptionOut | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| import CoreMedia | ||
| import Foundation | ||
|
|
||
| protocol NALUnit { | ||
| init(_ data: Data) | ||
| } | ||
|
|
||
| final class NALUnitReader { | ||
| static let defaultNALUnitHeaderLength: Int32 = 4 | ||
| var nalUnitHeaderLength: Int32 = NALUnitReader.defaultNALUnitHeaderLength | ||
|
|
||
| func read<T: NALUnit>(_ data: inout Data, type: T.Type) -> [T] { | ||
| var units: [T] = .init() | ||
| var lastIndexOf = data.count - 1 | ||
| for i in (2..<data.count).reversed() { | ||
| guard data[i] == 1 && data[i - 1] == 0 && data[i - 2] == 0 else { | ||
| continue | ||
| } | ||
| let startCodeLength = 0 <= i - 3 && data[i - 3] == 0 ? 4 : 3 | ||
| units.append(T.init(data.subdata(in: (i + 1)..<lastIndexOf + 1))) | ||
| lastIndexOf = i - startCodeLength | ||
| } | ||
| return units | ||
| } | ||
|
|
||
| func makeFormatDescription(_ data: inout Data, type: ESStreamType) -> CMFormatDescription? { | ||
| switch type { | ||
| case .h264: | ||
| let units = read(&data, type: AVCNALUnit.self) | ||
| return units.makeFormatDescription(nalUnitHeaderLength) | ||
| case .h265: | ||
| let units = read(&data, type: HEVCNALUnit.self) | ||
| return units.makeFormatDescription(nalUnitHeaderLength) | ||
| default: | ||
| return nil | ||
| } | ||
| } | ||
| } |
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