优化`hvcC`生成
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nilaoda
parent
999f01e0a0
commit
093794cdd9
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@ -7,6 +7,8 @@ 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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{
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public partial class MSSMoovProcessor
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@ -92,6 +94,7 @@ namespace N_m3u8DL_RE.Parser.Mp4
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}
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}
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private static string[] HEVC_GENERAL_PROFILE_SPACE_STRINGS = new string[] { "", "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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@ -520,9 +523,9 @@ namespace N_m3u8DL_RE.Parser.Mp4
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else if (FourCC == "HVC1" || FourCC == "HEV1")
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{
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var arr = CodecPrivateData.Split(new[] { StartCode }, StringSplitOptions.RemoveEmptyEntries);
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var sps = HexUtil.HexToBytes(arr[0]);
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var pps = HexUtil.HexToBytes(arr[1]);
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var vps = arr.Length > 2 ? HexUtil.HexToBytes(arr[2]) : null;
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var vps = HexUtil.HexToBytes(arr[0]);
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var sps = HexUtil.HexToBytes(arr[1]);
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var pps = HexUtil.HexToBytes(arr[2]);
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//make hvcC
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var hvcC = GetHvcC(sps, pps, vps);
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writer.Write(hvcC);
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@ -582,19 +585,88 @@ namespace N_m3u8DL_RE.Parser.Mp4
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return Box("avcC", stream.ToArray()); //AVC Decoder Configuration Record
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}
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private byte[] GetHvcC(byte[] sps, byte[] pps, byte[]? vps)
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private byte[] GetHvcC(byte[] sps, byte[] pps, byte[] vps)
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{
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var oriSps = new List<byte>(sps);
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//https://www.itu.int/rec/dologin.asp?lang=f&id=T-REC-H.265-201504-S!!PDF-E&type=items
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//Read generalProfileSpace, generalTierFlag, generalProfileIdc,
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//generalProfileCompatibilityFlags, constraintBytes, generalLevelIdc
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//from sps
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var encList = new List<byte>();
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/**
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* 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
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* 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
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* 00 00 03 03 03 03 03 01 会被直接处理成 => 00 00 01
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* 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
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*
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* 测试的数据如下：
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* 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
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* 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
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*/
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using (var _reader = new BinaryReader(new MemoryStream(sps)))
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{
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while (_reader.BaseStream.Position < _reader.BaseStream.Length)
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{
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encList.Add(_reader.ReadByte());
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if (encList.Count >= 3 && encList[encList.Count - 3] == 0x00 && encList[encList.Count - 2] == 0x00 && encList[encList.Count - 1] == 0x03)
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{
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encList.RemoveAt(encList.Count - 1);
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}
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}
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}
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sps = encList.ToArray();
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using var reader = new BinaryReader2(new MemoryStream(sps));
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reader.ReadBytes(2); //Skip 2 bytes unit header
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var firstByte = reader.ReadByte();
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var maxSubLayersMinus1 = (firstByte & 0xe) >> 1;
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var nextByte = reader.ReadByte();
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var generalProfileSpace = (nextByte & 0xc0) >> 6;
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var generalTierFlag = (nextByte & 0x20) >> 5;
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var generalProfileIdc = nextByte & 0x1f;
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var generalProfileCompatibilityFlags = reader.ReadUInt32();
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var constraintBytes = reader.ReadBytes(6);
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var generalLevelIdc = reader.ReadByte();
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/*var skipBit = 0;
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for (int i = 0; i < maxSubLayersMinus1; i++)
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{
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skipBit += 2; //sub_layer_profile_present_flag sub_layer_level_present_flag
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}
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if (maxSubLayersMinus1 > 0)
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{
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for (int i = maxSubLayersMinus1; i < 8; i++)
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{
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skipBit += 2; //reserved_zero_2bits
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}
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}
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for (int i = 0; i < maxSubLayersMinus1; i++)
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{
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skipBit += 2; //sub_layer_profile_present_flag sub_layer_level_present_flag
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}*/
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//生成编码信息
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var codecs = $"hvc1" +
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$".{HEVC_GENERAL_PROFILE_SPACE_STRINGS[generalProfileSpace]}{generalProfileIdc}" +
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$".{Convert.ToString(generalProfileCompatibilityFlags, 16)}" +
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$".{(generalTierFlag == 1 ? 'H' : 'L')}{generalLevelIdc}" +
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$".{HexUtil.BytesToHex(constraintBytes.Where(b => b != 0).ToArray())}";
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StreamSpec.Codecs = codecs;
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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 generalProfileCompatibilityFlags = 0xffffffff;
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var generalConstraintIndicatorFlags = 0xffffffffffff;
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//var reserved1 = 0xF;
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writer.WriteByte(1); //configuration version
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writer.WriteByte(0 << 6 | 0 << 5 | 0); //general_profile_space + general_tier_flag + general_profile_idc
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writer.WriteByte((byte)((generalProfileSpace << 6) + (generalTierFlag == 1 ? 0x20 : 0) | generalProfileIdc)); //general_profile_space + general_tier_flag + general_profile_idc
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writer.WriteUInt(generalProfileCompatibilityFlags); //general_profile_compatibility_flags
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writer.WriteUInt(generalConstraintIndicatorFlags >> 16); //general_constraint_indicator_flags
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writer.WriteUShort(ushort.MaxValue);
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writer.WriteByte(0); //general_level_idc
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writer.Write(constraintBytes); //general_constraint_indicator_flags
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writer.WriteByte((byte)generalProfileIdc); //general_level_idc
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writer.WriteUShort(0xf000); //reserved + min_spatial_segmentation_idc
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writer.WriteByte(0xfc); //reserved + parallelismType
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writer.WriteByte(0 | 0xfc); //reserved + chromaFormat
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@ -602,21 +674,19 @@ namespace N_m3u8DL_RE.Parser.Mp4
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writer.WriteByte(0 | 0xf8); //reserved + bitDepthChromaMinus8
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writer.WriteUShort(0); //avgFrameRate
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writer.WriteByte((byte)(0 << 6 | 0 << 3 | 0 << 2 | (NalUnitLengthField - 1))); //constantFrameRate + numTemporalLayers + temporalIdNested + lengthSizeMinusOne
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writer.WriteByte((byte)(vps != null ? 0x03 : 0x02)); //numOfArrays (vps sps pps)
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writer.WriteByte(0x03); //numOfArrays (vps sps pps)
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if (vps != null)
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{
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writer.WriteByte(32); //array_completeness + reserved + NAL_unit_type
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writer.WriteUShort(1); //numNalus
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writer.WriteUShort(vps.Length);
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writer.Write(vps);
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}
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writer.WriteByte(33);
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writer.WriteByte(1); //numNalus
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sps = oriSps.ToArray();
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writer.WriteByte(0x20); //array_completeness + reserved + NAL_unit_type
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writer.WriteUShort(1); //numNalus
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writer.WriteUShort(vps.Length);
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writer.Write(vps);
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writer.WriteByte(0x21);
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writer.WriteUShort(1); //numNalus
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writer.WriteUShort(sps.Length);
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writer.Write(sps);
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writer.WriteByte(34);
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writer.WriteByte(1); //numNalus
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writer.WriteByte(0x22);
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writer.WriteUShort(1); //numNalus
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writer.WriteUShort(pps.Length);
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writer.Write(pps);
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