mirror of
https://github.com/NohamR/N_m3u8DL-RE.git
synced 2025-05-24 00:48:58 +00:00
870 lines
34 KiB
C#
870 lines
34 KiB
C#
using Mp4SubtitleParser;
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using N_m3u8DL_RE.Common.Entity;
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using N_m3u8DL_RE.Common.Util;
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using System.Text;
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using System.Text.RegularExpressions;
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// https://github.com/canalplus/rx-player/blob/48d1f845064cea5c5a3546d2c53b1855c2be149d/src/parsers/manifest/smooth/get_codecs.ts
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// https://github.dev/Dash-Industry-Forum/dash.js/blob/2aad3e79079b4de0bcd961ce6b4957103d98a621/src/mss/MssFragmentMoovProcessor.js
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// https://github.com/yt-dlp/yt-dlp/blob/3639df54c3298e35b5ae2a96a25bc4d3c38950d0/yt_dlp/downloader/ism.py
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// https://github.com/google/ExoPlayer/blob/a9444c880230d2c2c79097e89259ce0b9f80b87d/library/extractor/src/main/java/com/google/android/exoplayer2/video/HevcConfig.java#L38
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// https://github.com/sannies/mp4parser/blob/master/isoparser/src/main/java/org/mp4parser/boxes/iso14496/part15/HevcDecoderConfigurationRecord.java
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namespace N_m3u8DL_RE.Parser.Mp4;
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public partial class MSSMoovProcessor
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{
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[GeneratedRegex(@"\<KID\>(.*?)\<")]
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private static partial Regex KIDRegex();
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private static string StartCode = "00000001";
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private StreamSpec StreamSpec;
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private int TrackId = 2;
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private string FourCC;
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private string CodecPrivateData;
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private int Timesacle;
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private long Duration;
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private string Language => StreamSpec.Language ?? "und";
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private int Width => int.Parse((StreamSpec.Resolution ?? "0x0").Split('x').First());
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private int Height => int.Parse((StreamSpec.Resolution ?? "0x0").Split('x').Last());
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private string StreamType;
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private int Channels;
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private int BitsPerSample;
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private int SamplingRate;
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private int NalUnitLengthField;
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private long CreationTime = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
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private bool IsProtection;
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private string ProtectionSystemId;
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private string ProtectionData;
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private string? ProtectionKID;
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private string? ProtectionKID_PR;
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private byte[] UnityMatrix
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{
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get
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.WriteInt(0x10000);
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writer.WriteInt(0);
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writer.WriteInt(0);
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writer.WriteInt(0);
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writer.WriteInt(0x10000);
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writer.WriteInt(0);
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writer.WriteInt(0);
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writer.WriteInt(0);
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writer.WriteInt(0x40000000);
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return stream.ToArray();
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}
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}
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private static byte TRACK_ENABLED = 0x1;
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private static byte TRACK_IN_MOVIE = 0x2;
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private static byte TRACK_IN_PREVIEW = 0x4;
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private static byte SELF_CONTAINED = 0x1;
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private static List<string> SupportedFourCC =
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["HVC1", "HEV1", "AACL", "AACH", "EC-3", "H264", "AVC1", "DAVC", "AVC1", "TTML", "DVHE", "DVH1"];
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public MSSMoovProcessor(StreamSpec streamSpec)
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{
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this.StreamSpec = streamSpec;
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var data = streamSpec.MSSData!;
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this.NalUnitLengthField = data.NalUnitLengthField;
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this.CodecPrivateData = data.CodecPrivateData;
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this.FourCC = data.FourCC;
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this.Timesacle = data.Timesacle;
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this.Duration = data.Duration;
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this.StreamType = data.Type;
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this.Channels = data.Channels;
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this.SamplingRate = data.SamplingRate;
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this.BitsPerSample = data.BitsPerSample;
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this.IsProtection = data.IsProtection;
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this.ProtectionData = data.ProtectionData;
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this.ProtectionSystemId = data.ProtectionSystemID;
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// 需要手动生成CodecPrivateData
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if (string.IsNullOrEmpty(CodecPrivateData))
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{
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GenCodecPrivateDataForAAC();
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}
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// 解析KID
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if (IsProtection)
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{
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ExtractKID();
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}
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}
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private static string[] HEVC_GENERAL_PROFILE_SPACE_STRINGS = ["", "A", "B", "C"];
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private int SamplingFrequencyIndex(int samplingRate) => samplingRate switch
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{
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96000 => 0x0,
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88200 => 0x1,
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64000 => 0x2,
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48000 => 0x3,
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44100 => 0x4,
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32000 => 0x5,
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24000 => 0x6,
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22050 => 0x7,
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16000 => 0x8,
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12000 => 0x9,
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11025 => 0xA,
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8000 => 0xB,
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7350 => 0xC,
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_ => 0x0
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};
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private void GenCodecPrivateDataForAAC()
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{
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var objectType = 0x02; // AAC Main Low Complexity => object Type = 2
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var indexFreq = SamplingFrequencyIndex(SamplingRate);
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if (FourCC == "AACH")
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{
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// 4 bytes : XXXXX XXXX XXXX XXXX XXXXX XXX XXXXXXX
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// ' ObjectType' 'Freq Index' 'Channels value' 'Extens Sampl Freq' 'ObjectType' 'GAS' 'alignment = 0'
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objectType = 0x05; // High Efficiency AAC Profile = object Type = 5 SBR
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var codecPrivateData = new byte[4];
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var extensionSamplingFrequencyIndex = SamplingFrequencyIndex(SamplingRate * 2); // in HE AAC Extension Sampling frequence
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// equals to SamplingRate*2
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// Freq Index is present for 3 bits in the first byte, last bit is in the second
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codecPrivateData[0] = (byte)((objectType << 3) | (indexFreq >> 1));
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codecPrivateData[1] = (byte)((indexFreq << 7) | (Channels << 3) | (extensionSamplingFrequencyIndex >> 1));
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codecPrivateData[2] = (byte)((extensionSamplingFrequencyIndex << 7) | (0x02 << 2)); // origin object type equals to 2 => AAC Main Low Complexity
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codecPrivateData[3] = 0x0; // alignment bits
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var arr16 = new ushort[2];
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arr16[0] = (ushort)((codecPrivateData[0] << 8) + codecPrivateData[1]);
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arr16[1] = (ushort)((codecPrivateData[2] << 8) + codecPrivateData[3]);
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// convert decimal to hex value
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this.CodecPrivateData = HexUtil.BytesToHex(BitConverter.GetBytes(arr16[0])).PadLeft(16, '0');
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this.CodecPrivateData += HexUtil.BytesToHex(BitConverter.GetBytes(arr16[1])).PadLeft(16, '0');
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}
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else if (FourCC.StartsWith("AAC"))
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{
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// 2 bytes : XXXXX XXXX XXXX XXX
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// ' ObjectType' 'Freq Index' 'Channels value' 'GAS = 000'
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var codecPrivateData = new byte[2];
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// Freq Index is present for 3 bits in the first byte, last bit is in the second
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codecPrivateData[0] = (byte)((objectType << 3) | (indexFreq >> 1));
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codecPrivateData[1] = (byte)((indexFreq << 7) | Channels << 3);
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// put the 2 bytes in an 16 bits array
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var arr16 = new ushort[1];
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arr16[0] = (ushort)((codecPrivateData[0] << 8) + codecPrivateData[1]);
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// convert decimal to hex value
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this.CodecPrivateData = HexUtil.BytesToHex(BitConverter.GetBytes(arr16[0])).PadLeft(16, '0');
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}
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}
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private void ExtractKID()
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{
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// playready
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if (ProtectionSystemId.ToUpper() == "9A04F079-9840-4286-AB92-E65BE0885F95")
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{
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var bytes = HexUtil.HexToBytes(ProtectionData.Replace("00", ""));
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var text = Encoding.ASCII.GetString(bytes);
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var kidBytes = Convert.FromBase64String(KIDRegex().Match(text).Groups[1].Value);
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// save kid for playready
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this.ProtectionKID_PR = HexUtil.BytesToHex(kidBytes);
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// fix byte order
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var reverse1 = new[] { kidBytes[3], kidBytes[2], kidBytes[1], kidBytes[0] };
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var reverse2 = new[] { kidBytes[5], kidBytes[4], kidBytes[7], kidBytes[6] };
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Array.Copy(reverse1, 0, kidBytes, 0, reverse1.Length);
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Array.Copy(reverse2, 0, kidBytes, 4, reverse1.Length);
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this.ProtectionKID = HexUtil.BytesToHex(kidBytes);
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}
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// widevine
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else if (ProtectionSystemId.ToUpper() == "EDEF8BA9-79D6-4ACE-A3C8-27DCD51D21ED")
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{
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// Console.WriteLine($"WV Protection Data: {ProtectionData}");
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throw new NotSupportedException();
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}
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}
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public static bool CanHandle(string fourCC) => SupportedFourCC.Contains(fourCC);
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private byte[] Box(string boxType, byte[] payload)
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.WriteUInt(8 + (uint)payload.Length);
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writer.Write(boxType);
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writer.Write(payload);
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return stream.ToArray();
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}
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private byte[] FullBox(string boxType, byte version, uint flags, byte[] payload)
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.Write(version);
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writer.WriteUInt(flags, offset: 1);
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writer.Write(payload);
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return Box(boxType, stream.ToArray());
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}
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private byte[] GenSinf(string codec)
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{
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var frmaBox = Box("frma", Encoding.ASCII.GetBytes(codec));
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var sinfPayload = new List<byte>();
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sinfPayload.AddRange(frmaBox);
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var schmPayload = new List<byte>();
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schmPayload.AddRange(Encoding.ASCII.GetBytes("cenc")); // scheme_type 'cenc' => common encryption
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schmPayload.AddRange([0, 1, 0, 0]); // scheme_version Major version 1, Minor version 0
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var schmBox = FullBox("schm", 0, 0, schmPayload.ToArray());
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sinfPayload.AddRange(schmBox);
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var tencPayload = new List<byte>();
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tencPayload.AddRange([0, 0]);
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tencPayload.Add(0x1); // default_IsProtected
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tencPayload.Add(0x8); // default_Per_Sample_IV_size
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tencPayload.AddRange(HexUtil.HexToBytes(ProtectionKID)); // default_KID
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// tencPayload.Add(0x8);// default_constant_IV_size
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// tencPayload.AddRange(new byte[8]);// default_constant_IV
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var tencBox = FullBox("tenc", 0, 0, tencPayload.ToArray());
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var schiBox = Box("schi", tencBox);
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sinfPayload.AddRange(schiBox);
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var sinfBox = Box("sinf", sinfPayload.ToArray());
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return sinfBox;
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}
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private byte[] GenFtyp()
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.Write("isml"); // major brand
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writer.WriteUInt(1); // minor version
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writer.Write("iso5"); // compatible brand
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writer.Write("iso6"); // compatible brand
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writer.Write("piff"); // compatible brand
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writer.Write("msdh"); // compatible brand
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return Box("ftyp", stream.ToArray());
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}
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private byte[] GenMvhd()
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.WriteULong(CreationTime); // creation_time
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writer.WriteULong(CreationTime); // modification_time
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writer.WriteUInt(Timesacle); // timescale
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writer.WriteULong(Duration); // duration
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writer.WriteUShort(1, padding: 2); // rate
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writer.WriteByte(1, padding: 1); // volume
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writer.WriteUShort(0); // reserved
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writer.WriteUInt(0);
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writer.WriteUInt(0);
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writer.Write(UnityMatrix);
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writer.WriteUInt(0); // pre defined
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writer.WriteUInt(0);
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writer.WriteUInt(0);
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writer.WriteUInt(0);
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writer.WriteUInt(0);
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writer.WriteUInt(0);
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writer.WriteUInt(0xffffffff); // next track id
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return FullBox("mvhd", 1, 0, stream.ToArray());
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}
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private byte[] GenTkhd()
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.WriteULong(CreationTime); // creation_time
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writer.WriteULong(CreationTime); // modification_time
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writer.WriteUInt(TrackId); // track id
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writer.WriteUInt(0); // reserved
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writer.WriteULong(Duration); // duration
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writer.WriteUInt(0); // reserved
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writer.WriteUInt(0);
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writer.WriteShort(0); // layer
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writer.WriteShort(0); // alternate group
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writer.WriteByte(StreamType == "audio" ? (byte)1 : (byte)0, padding: 1); // volume
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writer.WriteUShort(0); // reserved
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writer.Write(UnityMatrix);
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writer.WriteUShort(Width, padding: 2); // width
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writer.WriteUShort(Height, padding: 2); // height
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return FullBox("tkhd", 1, (uint)TRACK_ENABLED | TRACK_IN_MOVIE | TRACK_IN_PREVIEW, stream.ToArray());
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}
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private byte[] GenMdhd()
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.WriteULong(CreationTime); // creation_time
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writer.WriteULong(CreationTime); // modification_time
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writer.WriteUInt(Timesacle); // timescale
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writer.WriteULong(Duration); // duration
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writer.WriteUShort((Language[0] - 0x60) << 10 | (Language[1] - 0x60) << 5 | (Language[2] - 0x60)); // language
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writer.WriteUShort(0); // pre defined
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return FullBox("mdhd", 1, 0, stream.ToArray());
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}
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private byte[] GenHdlr()
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.WriteUInt(0); // pre defined
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if (StreamType == "audio") writer.Write("soun");
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else if (StreamType == "video") writer.Write("vide");
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else if (StreamType == "text") writer.Write("subt");
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else throw new NotSupportedException();
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writer.WriteUInt(0); // reserved
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writer.WriteUInt(0);
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writer.WriteUInt(0);
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writer.Write($"{StreamSpec.GroupId ?? "RE Handler"}\0"); // name
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return FullBox("hdlr", 0, 0, stream.ToArray());
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}
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private byte[] GenMinf()
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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var minfPayload = new List<byte>();
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if (StreamType == "audio")
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{
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var smhd = new List<byte>();
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smhd.Add(0); smhd.Add(0); // balance
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smhd.Add(0); smhd.Add(0); // reserved
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minfPayload.AddRange(FullBox("smhd", 0, 0, smhd.ToArray())); // Sound Media Header
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}
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else if (StreamType == "video")
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{
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var vmhd = new List<byte>();
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vmhd.Add(0); vmhd.Add(0); // graphics mode
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vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0);// opcolor
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minfPayload.AddRange(FullBox("vmhd", 0, 1, vmhd.ToArray())); // Video Media Header
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}
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else if (StreamType == "text")
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{
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minfPayload.AddRange(FullBox("sthd", 0, 0, [])); // Subtitle Media Header
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}
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else
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{
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throw new NotSupportedException();
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}
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var drefPayload = new List<byte>();
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drefPayload.Add(0); drefPayload.Add(0); drefPayload.Add(0); drefPayload.Add(1); // entry count
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drefPayload.AddRange(FullBox("url ", 0, SELF_CONTAINED, [])); // Data Entry URL Box
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var dinfPayload = FullBox("dref", 0, 0, drefPayload.ToArray()); // Data Reference Box
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minfPayload.AddRange(Box("dinf", dinfPayload.ToArray())); // Data Information Box
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return minfPayload.ToArray();
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}
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private byte[] GenEsds(byte[] audioSpecificConfig)
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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// ESDS length = esds box header length (= 12) +
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// ES_Descriptor header length (= 5) +
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// DecoderConfigDescriptor header length (= 15) +
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// decoderSpecificInfo header length (= 2) +
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// AudioSpecificConfig length (= codecPrivateData length)
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// esdsLength = 34 + len(audioSpecificConfig)
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// ES_Descriptor (see ISO/IEC 14496-1 (Systems))
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writer.WriteByte(0x03); // tag = 0x03 (ES_DescrTag)
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writer.WriteByte((byte)(20 + audioSpecificConfig.Length)); // size
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writer.WriteByte((byte)((TrackId & 0xFF00) >> 8)); // ES_ID = track_id
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writer.WriteByte((byte)(TrackId & 0x00FF));
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writer.WriteByte(0); // flags and streamPriority
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// DecoderConfigDescriptor (see ISO/IEC 14496-1 (Systems))
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writer.WriteByte(0x04); // tag = 0x04 (DecoderConfigDescrTag)
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writer.WriteByte((byte)(15 + audioSpecificConfig.Length)); // size
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writer.WriteByte(0x40); // objectTypeIndication = 0x40 (MPEG-4 AAC)
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writer.WriteByte((0x05 << 2) | (0 << 1) | 1); // reserved = 1
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writer.WriteByte(0xFF); // buffersizeDB = undefined
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writer.WriteByte(0xFF);
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writer.WriteByte(0xFF);
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var bandwidth = StreamSpec.Bandwidth!;
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writer.WriteByte((byte)((bandwidth & 0xFF000000) >> 24)); // maxBitrate
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writer.WriteByte((byte)((bandwidth & 0x00FF0000) >> 16));
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writer.WriteByte((byte)((bandwidth & 0x0000FF00) >> 8));
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writer.WriteByte((byte)(bandwidth & 0x000000FF));
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writer.WriteByte((byte)((bandwidth & 0xFF000000) >> 24)); // avgbitrate
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writer.WriteByte((byte)((bandwidth & 0x00FF0000) >> 16));
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writer.WriteByte((byte)((bandwidth & 0x0000FF00) >> 8));
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writer.WriteByte((byte)(bandwidth & 0x000000FF));
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// DecoderSpecificInfo (see ISO/IEC 14496-1 (Systems))
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writer.WriteByte(0x05); // tag = 0x05 (DecSpecificInfoTag)
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writer.WriteByte((byte)audioSpecificConfig.Length); // size
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writer.Write(audioSpecificConfig); // AudioSpecificConfig bytes
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return FullBox("esds", 0, 0, stream.ToArray());
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}
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private byte[] GetSampleEntryBox()
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{
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using var stream = new MemoryStream();
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using var writer = new BinaryWriter2(stream);
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writer.WriteByte(0); // reserved
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writer.WriteByte(0);
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writer.WriteByte(0);
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writer.WriteByte(0);
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writer.WriteByte(0);
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writer.WriteByte(0);
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writer.WriteUShort(1); // data reference index
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if (StreamType == "audio")
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{
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writer.WriteUInt(0); // reserved2
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writer.WriteUInt(0);
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writer.WriteUShort(Channels); // channels
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writer.WriteUShort(BitsPerSample); // bits_per_sample
|
||
writer.WriteUShort(0); // pre defined
|
||
writer.WriteUShort(0); // reserved3
|
||
writer.WriteUShort(SamplingRate, padding: 2); // sampling_rate
|
||
|
||
var audioSpecificConfig = HexUtil.HexToBytes(CodecPrivateData);
|
||
var esdsBox = GenEsds(audioSpecificConfig);
|
||
writer.Write(esdsBox);
|
||
|
||
if (FourCC.StartsWith("AAC"))
|
||
{
|
||
if (IsProtection)
|
||
{
|
||
var sinfBox = GenSinf("mp4a");
|
||
writer.Write(sinfBox);
|
||
return Box("enca", stream.ToArray()); // Encrypted Audio
|
||
}
|
||
return Box("mp4a", stream.ToArray());
|
||
}
|
||
if (FourCC == "EC-3")
|
||
{
|
||
if (IsProtection)
|
||
{
|
||
var sinfBox = GenSinf("ec-3");
|
||
writer.Write(sinfBox);
|
||
return Box("enca", stream.ToArray()); // Encrypted Audio
|
||
}
|
||
return Box("ec-3", stream.ToArray());
|
||
}
|
||
}
|
||
else if (StreamType == "video")
|
||
{
|
||
writer.WriteUShort(0); // pre defined
|
||
writer.WriteUShort(0); // reserved
|
||
writer.WriteUInt(0); // pre defined
|
||
writer.WriteUInt(0);
|
||
writer.WriteUInt(0);
|
||
writer.WriteUShort(Width); // width
|
||
writer.WriteUShort(Height); // height
|
||
writer.WriteUShort(0x48, padding: 2); // horiz resolution 72 dpi
|
||
writer.WriteUShort(0x48, padding: 2); // vert resolution 72 dpi
|
||
writer.WriteUInt(0); // reserved
|
||
writer.WriteUShort(1); // frame count
|
||
for (int i = 0; i < 32; i++) // compressor name
|
||
{
|
||
writer.WriteByte(0);
|
||
}
|
||
writer.WriteUShort(0x18); // depth
|
||
writer.WriteUShort(65535); // pre defined
|
||
|
||
var codecPrivateData = HexUtil.HexToBytes(CodecPrivateData);
|
||
|
||
if (FourCC is "H264" or "AVC1" or "DAVC")
|
||
{
|
||
var arr = CodecPrivateData.Split([StartCode], StringSplitOptions.RemoveEmptyEntries);
|
||
var sps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] & 0x1F) == 7));
|
||
var pps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] & 0x1F) == 8));
|
||
// make avcC
|
||
var avcC = GetAvcC(sps, pps);
|
||
writer.Write(avcC);
|
||
if (IsProtection)
|
||
{
|
||
var sinfBox = GenSinf("avc1");
|
||
writer.Write(sinfBox);
|
||
return Box("encv", stream.ToArray()); // Encrypted Video
|
||
}
|
||
return Box("avc1", stream.ToArray()); // AVC Simple Entry
|
||
}
|
||
if (FourCC is "HVC1" or "HEV1")
|
||
{
|
||
var arr = CodecPrivateData.Split([StartCode], StringSplitOptions.RemoveEmptyEntries);
|
||
var vps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x20));
|
||
var sps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x21));
|
||
var pps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x22));
|
||
// make hvcC
|
||
var hvcC = GetHvcC(sps, pps, vps);
|
||
writer.Write(hvcC);
|
||
if (IsProtection)
|
||
{
|
||
var sinfBox = GenSinf("hvc1");
|
||
writer.Write(sinfBox);
|
||
return Box("encv", stream.ToArray()); // Encrypted Video
|
||
}
|
||
return Box("hvc1", stream.ToArray()); // HEVC Simple Entry
|
||
}
|
||
// 杜比视界也按照hevc处理
|
||
if (FourCC is "DVHE" or "DVH1")
|
||
{
|
||
var arr = CodecPrivateData.Split([StartCode], StringSplitOptions.RemoveEmptyEntries);
|
||
var vps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x20));
|
||
var sps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x21));
|
||
var pps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x22));
|
||
// make hvcC
|
||
var hvcC = GetHvcC(sps, pps, vps, "dvh1");
|
||
writer.Write(hvcC);
|
||
if (IsProtection)
|
||
{
|
||
var sinfBox = GenSinf("dvh1");
|
||
writer.Write(sinfBox);
|
||
return Box("encv", stream.ToArray()); // Encrypted Video
|
||
}
|
||
return Box("dvh1", stream.ToArray()); // HEVC Simple Entry
|
||
}
|
||
|
||
throw new NotSupportedException();
|
||
}
|
||
else if (StreamType == "text")
|
||
{
|
||
if (FourCC == "TTML")
|
||
{
|
||
writer.Write("http://www.w3.org/ns/ttml\0"); // namespace
|
||
writer.Write("\0"); // schema location
|
||
writer.Write("\0"); // auxilary mime types(??)
|
||
return Box("stpp", stream.ToArray()); // TTML Simple Entry
|
||
}
|
||
throw new NotSupportedException();
|
||
}
|
||
else
|
||
{
|
||
throw new NotSupportedException();
|
||
}
|
||
|
||
throw new NotSupportedException();
|
||
}
|
||
|
||
private byte[] GetAvcC(byte[] sps, byte[] pps)
|
||
{
|
||
using var stream = new MemoryStream();
|
||
using var writer = new BinaryWriter2(stream);
|
||
|
||
writer.WriteByte(1); // configuration version
|
||
writer.Write(sps[1..4]); // avc profile indication + profile compatibility + avc level indication
|
||
writer.WriteByte((byte)(0xfc | (NalUnitLengthField - 1))); // complete representation (1) + reserved (11111) + length size minus one
|
||
writer.WriteByte(1); // reserved (0) + number of sps (0000001)
|
||
writer.WriteUShort(sps.Length);
|
||
writer.Write(sps);
|
||
writer.WriteByte(1); // number of pps
|
||
writer.WriteUShort(pps.Length);
|
||
writer.Write(pps);
|
||
|
||
return Box("avcC", stream.ToArray()); // AVC Decoder Configuration Record
|
||
}
|
||
|
||
private byte[] GetHvcC(byte[] sps, byte[] pps, byte[] vps, string code = "hvc1")
|
||
{
|
||
var oriSps = new List<byte>(sps);
|
||
// https://www.itu.int/rec/dologin.asp?lang=f&id=T-REC-H.265-201504-S!!PDF-E&type=items
|
||
// Read generalProfileSpace, generalTierFlag, generalProfileIdc,
|
||
// generalProfileCompatibilityFlags, constraintBytes, generalLevelIdc
|
||
// from sps
|
||
var encList = new List<byte>();
|
||
/**
|
||
* 处理payload, 有00 00 03 0,1,2,3的情况 统一换成00 00 XX 即丢弃03
|
||
* 注意：此处采用的逻辑是直接简单粗暴地判断列表末尾3字节，如果是0x000003就删掉最后的0x03，可能会导致以下情况
|
||
* 00 00 03 03 03 03 03 01 会被直接处理成 => 00 00 01
|
||
* 此处经过测试只有直接跳过才正常，如果处理成 00 00 03 03 03 03 01 是有问题的
|
||
*
|
||
* 测试的数据如下：
|
||
* 原始：42 01 01 01 60 00 00 03 00 90 00 00 03 00 00 03 00 96 a0 01 e0 20 06 61 65 95 9a 49 30 bf fc 0c 7c 0c 81 a8 08 08 08 20 00 00 03 00 20 00 00 03 03 01
|
||
* 处理后：42 01 01 01 60 00 00 00 90 00 00 00 00 00 96 A0 01 E0 20 06 61 65 95 9A 49 30 BF FC 0C 7C 0C 81 A8 08 08 08 20 00 00 00 20 00 00 01
|
||
*/
|
||
using (var _reader = new BinaryReader(new MemoryStream(sps)))
|
||
{
|
||
while (_reader.BaseStream.Position < _reader.BaseStream.Length)
|
||
{
|
||
encList.Add(_reader.ReadByte());
|
||
if (encList is [.., 0x00, 0x00, 0x03])
|
||
{
|
||
encList.RemoveAt(encList.Count - 1);
|
||
}
|
||
}
|
||
}
|
||
sps = encList.ToArray();
|
||
|
||
using var reader = new BinaryReader2(new MemoryStream(sps));
|
||
reader.ReadBytes(2); // Skip 2 bytes unit header
|
||
var firstByte = reader.ReadByte();
|
||
var maxSubLayersMinus1 = (firstByte & 0xe) >> 1;
|
||
var nextByte = reader.ReadByte();
|
||
var generalProfileSpace = (nextByte & 0xc0) >> 6;
|
||
var generalTierFlag = (nextByte & 0x20) >> 5;
|
||
var generalProfileIdc = nextByte & 0x1f;
|
||
var generalProfileCompatibilityFlags = reader.ReadUInt32();
|
||
var constraintBytes = reader.ReadBytes(6);
|
||
var generalLevelIdc = reader.ReadByte();
|
||
|
||
/*var skipBit = 0;
|
||
for (int i = 0; i < maxSubLayersMinus1; i++)
|
||
{
|
||
skipBit += 2; // sub_layer_profile_present_flag sub_layer_level_present_flag
|
||
}
|
||
if (maxSubLayersMinus1 > 0)
|
||
{
|
||
for (int i = maxSubLayersMinus1; i < 8; i++)
|
||
{
|
||
skipBit += 2; // reserved_zero_2bits
|
||
}
|
||
}
|
||
for (int i = 0; i < maxSubLayersMinus1; i++)
|
||
{
|
||
skipBit += 2; // sub_layer_profile_present_flag sub_layer_level_present_flag
|
||
}*/
|
||
|
||
// 生成编码信息
|
||
var codecs = code +
|
||
$".{HEVC_GENERAL_PROFILE_SPACE_STRINGS[generalProfileSpace]}{generalProfileIdc}" +
|
||
$".{Convert.ToString(generalProfileCompatibilityFlags, 16)}" +
|
||
$".{(generalTierFlag == 1 ? 'H' : 'L')}{generalLevelIdc}" +
|
||
$".{HexUtil.BytesToHex(constraintBytes.Where(b => b != 0).ToArray())}";
|
||
StreamSpec.Codecs = codecs;
|
||
|
||
|
||
///////////////////////
|
||
|
||
|
||
using var stream = new MemoryStream();
|
||
using var writer = new BinaryWriter2(stream);
|
||
|
||
// var reserved1 = 0xF;
|
||
|
||
writer.WriteByte(1); // configuration version
|
||
writer.WriteByte((byte)((generalProfileSpace << 6) + (generalTierFlag == 1 ? 0x20 : 0) | generalProfileIdc)); // general_profile_space + general_tier_flag + general_profile_idc
|
||
writer.WriteUInt(generalProfileCompatibilityFlags); // general_profile_compatibility_flags
|
||
writer.Write(constraintBytes); // general_constraint_indicator_flags
|
||
writer.WriteByte((byte)generalProfileIdc); // general_level_idc
|
||
writer.WriteUShort(0xf000); // reserved + min_spatial_segmentation_idc
|
||
writer.WriteByte(0xfc); // reserved + parallelismType
|
||
writer.WriteByte(0 | 0xfc); // reserved + chromaFormat
|
||
writer.WriteByte(0 | 0xf8); // reserved + bitDepthLumaMinus8
|
||
writer.WriteByte(0 | 0xf8); // reserved + bitDepthChromaMinus8
|
||
writer.WriteUShort(0); // avgFrameRate
|
||
writer.WriteByte((byte)(0 << 6 | 0 << 3 | 0 << 2 | (NalUnitLengthField - 1))); // constantFrameRate + numTemporalLayers + temporalIdNested + lengthSizeMinusOne
|
||
writer.WriteByte(0x03); // numOfArrays (vps sps pps)
|
||
|
||
sps = oriSps.ToArray();
|
||
writer.WriteByte(0x20); // array_completeness + reserved + NAL_unit_type
|
||
writer.WriteUShort(1); // numNalus
|
||
writer.WriteUShort(vps.Length);
|
||
writer.Write(vps);
|
||
writer.WriteByte(0x21);
|
||
writer.WriteUShort(1); // numNalus
|
||
writer.WriteUShort(sps.Length);
|
||
writer.Write(sps);
|
||
writer.WriteByte(0x22);
|
||
writer.WriteUShort(1); // numNalus
|
||
writer.WriteUShort(pps.Length);
|
||
writer.Write(pps);
|
||
|
||
return Box("hvcC", stream.ToArray()); // HEVC Decoder Configuration Record
|
||
}
|
||
|
||
private byte[] GetStsd()
|
||
{
|
||
using var stream = new MemoryStream();
|
||
using var writer = new BinaryWriter2(stream);
|
||
|
||
writer.WriteUInt(1); // entry count
|
||
var sampleEntryData = GetSampleEntryBox();
|
||
writer.Write(sampleEntryData);
|
||
|
||
return stream.ToArray();
|
||
}
|
||
|
||
private byte[] GetMehd()
|
||
{
|
||
using var stream = new MemoryStream();
|
||
using var writer = new BinaryWriter2(stream);
|
||
|
||
writer.WriteULong(Duration);
|
||
|
||
return FullBox("mehd", 1, 0, stream.ToArray()); // Movie Extends Header Box
|
||
}
|
||
private byte[] GetTrex()
|
||
{
|
||
using var stream = new MemoryStream();
|
||
using var writer = new BinaryWriter2(stream);
|
||
|
||
writer.WriteUInt(TrackId); // track id
|
||
writer.WriteUInt(1); // default sample description index
|
||
writer.WriteUInt(0); // default sample duration
|
||
writer.WriteUInt(0); // default sample size
|
||
writer.WriteUInt(0); // default sample flags
|
||
|
||
return FullBox("trex", 0, 0, stream.ToArray()); // Track Extends Box
|
||
}
|
||
|
||
private byte[] GenPsshBoxForPlayReady()
|
||
{
|
||
using var _stream = new MemoryStream();
|
||
using var _writer = new BinaryWriter2(_stream);
|
||
var sysIdData = HexUtil.HexToBytes(ProtectionSystemId.Replace("-", ""));
|
||
var psshData = HexUtil.HexToBytes(ProtectionData);
|
||
|
||
_writer.Write(sysIdData); // SystemID 16 bytes
|
||
_writer.WriteUInt(psshData.Length); // Size of Data 4 bytes
|
||
_writer.Write(psshData); // Data
|
||
var psshBox = FullBox("pssh", 0, 0, _stream.ToArray());
|
||
return psshBox;
|
||
}
|
||
|
||
private byte[] GenPsshBoxForWideVine()
|
||
{
|
||
using var _stream = new MemoryStream();
|
||
using var _writer = new BinaryWriter2(_stream);
|
||
var sysIdData = HexUtil.HexToBytes("edef8ba9-79d6-4ace-a3c8-27dcd51d21ed".Replace("-", ""));
|
||
// var kid = HexUtil.HexToBytes(ProtectionKID);
|
||
|
||
_writer.Write(sysIdData); // SystemID 16 bytes
|
||
var psshData = HexUtil.HexToBytes($"08011210{ProtectionKID}1A046E647265220400000000");
|
||
_writer.WriteUInt(psshData.Length); // Size of Data 4 bytes
|
||
_writer.Write(psshData); // Data
|
||
var psshBox = FullBox("pssh", 0, 0, _stream.ToArray());
|
||
return psshBox;
|
||
}
|
||
|
||
private byte[] GenMoof()
|
||
{
|
||
using var stream = new MemoryStream();
|
||
using var writer = new BinaryWriter2(stream);
|
||
|
||
// make senc
|
||
writer.WriteUInt(1); // sample_count
|
||
writer.Write(new byte[8]); // 8 bytes IV
|
||
|
||
var sencBox = FullBox("senc", 1, 0, stream.ToArray());
|
||
|
||
var moofBox = Box("moof", sencBox); // Movie Extends Box
|
||
|
||
return moofBox;
|
||
}
|
||
|
||
public byte[] GenHeader(byte[] firstSegment)
|
||
{
|
||
new MP4Parser()
|
||
.Box("moof", MP4Parser.Children)
|
||
.Box("traf", MP4Parser.Children)
|
||
.FullBox("tfhd", box =>
|
||
{
|
||
TrackId = (int)box.Reader.ReadUInt32();
|
||
})
|
||
.Parse(firstSegment);
|
||
|
||
return GenHeader();
|
||
}
|
||
|
||
public byte[] GenHeader()
|
||
{
|
||
using var stream = new MemoryStream();
|
||
|
||
var ftyp = GenFtyp(); // File Type Box
|
||
stream.Write(ftyp);
|
||
|
||
var moovPayload = GenMvhd(); // Movie Header Box
|
||
|
||
var trakPayload = GenTkhd(); // Track Header Box
|
||
|
||
var mdhdPayload = GenMdhd(); // Media Header Box
|
||
|
||
var hdlrPayload = GenHdlr(); // Handler Reference Box
|
||
|
||
var mdiaPayload = mdhdPayload.Concat(hdlrPayload).ToArray();
|
||
|
||
var minfPayload = GenMinf();
|
||
|
||
|
||
var sttsPayload = new byte[] { 0, 0, 0, 0 }; // entry count
|
||
var stblPayload = FullBox("stts", 0, 0, sttsPayload); // Decoding Time to Sample Box
|
||
|
||
var stscPayload = new byte[] { 0, 0, 0, 0 }; // entry count
|
||
var stscBox = FullBox("stsc", 0, 0, stscPayload); // Sample To Chunk Box
|
||
|
||
var stcoPayload = new byte[] { 0, 0, 0, 0 }; // entry count
|
||
var stcoBox = FullBox("stco", 0, 0, stcoPayload); // Chunk Offset Box
|
||
|
||
var stszPayload = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }; // sample size, sample count
|
||
var stszBox = FullBox("stsz", 0, 0, stszPayload); // Sample Size Box
|
||
|
||
var stsdPayload = GetStsd();
|
||
var stsdBox = FullBox("stsd", 0, 0, stsdPayload); // Sample Description Box
|
||
|
||
stblPayload = stblPayload.Concat(stscBox).Concat(stcoBox).Concat(stszBox).Concat(stsdBox).ToArray();
|
||
|
||
|
||
var stblBox = Box("stbl", stblPayload); // Sample Table Box
|
||
minfPayload = minfPayload.Concat(stblBox).ToArray();
|
||
|
||
var minfBox = Box("minf", minfPayload); // Media Information Box
|
||
mdiaPayload = mdiaPayload.Concat(minfBox).ToArray();
|
||
|
||
var mdiaBox = Box("mdia", mdiaPayload); // Media Box
|
||
trakPayload = trakPayload.Concat(mdiaBox).ToArray();
|
||
|
||
var trakBox = Box("trak", trakPayload); // Track Box
|
||
moovPayload = moovPayload.Concat(trakBox).ToArray();
|
||
|
||
var mvexPayload = GetMehd();
|
||
var trexBox = GetTrex();
|
||
mvexPayload = mvexPayload.Concat(trexBox).ToArray();
|
||
|
||
var mvexBox = Box("mvex", mvexPayload); // Movie Extends Box
|
||
moovPayload = moovPayload.Concat(mvexBox).ToArray();
|
||
|
||
if (IsProtection)
|
||
{
|
||
var psshBox1 = GenPsshBoxForPlayReady();
|
||
var psshBox2 = GenPsshBoxForWideVine();
|
||
moovPayload = moovPayload.Concat(psshBox1).Concat(psshBox2).ToArray();
|
||
}
|
||
|
||
var moovBox = Box("moov", moovPayload); // Movie Box
|
||
|
||
stream.Write(moovBox);
|
||
|
||
// var moofBox = GenMoof(); // Movie Extends Box
|
||
// stream.Write(moofBox);
|
||
|
||
return stream.ToArray();
|
||
}
|
||
} |