public HcaDecoder(Stream hcaStream, ulong key)
{
hca = new HcaContext();
Header.DecodeHeader(hca, hcaStream);
SetKey(key);
}
public static void DecodeHeader(HcaContext hca, Stream hcaStream)
{
if (!IsHeaderValid(hcaStream, out int headerSize))
{
throw new InvalidDataException("Invalid HCA header.");
}
BinaryReader binaryReader = new(hcaStream);
binaryReader.BaseStream.Position = 0;
BitReader bitReader = new(binaryReader.ReadBytes((int)headerSize));
if ((bitReader.Peek(32) & Mask) == StringToUInt32("HCA"))
{
bitReader.Skip(32);
hca.Version = bitReader.Read(16);
hca.HeaderSize = bitReader.Read(16);
headerSize -= 8;
}
else
{
throw new InvalidDataException("Not an HCA file.");
}
if (headerSize >= 16 && (bitReader.Peek(32) & Mask) == StringToUInt32("fmt"))
{
bitReader.Skip(32);
hca.ChannelCount = bitReader.Read(8);
hca.SampleRate = bitReader.Read(24);
hca.FrameCount = bitReader.Read(32);
hca.EncoderDelay = bitReader.Read(16);
hca.EncoderPadding = bitReader.Read(16);
if (hca.ChannelCount < MinChannels || hca.ChannelCount > MaxChannels)
{
throw new InvalidDataException("Invalid channel count.");
}
if (hca.FrameCount == 0)
{
throw new InvalidDataException("Frame count is zero.");
}
if (hca.SampleRate < MinSampleRate || hca.SampleRate > MaxSampleRate)
{
throw new InvalidDataException("Invalid sample rate.");
}
headerSize -= 16;
}
else
{
throw new InvalidDataException("No format chunk.");
}
if (headerSize >= 16 && (bitReader.Peek(32) & Mask) == StringToUInt32("comp"))
{
bitReader.Skip(32);
hca.FrameSize = bitReader.Read(16);
hca.MinResolution = bitReader.Read(8);
hca.MaxResolution = bitReader.Read(8);
hca.TrackCount = bitReader.Read(8);
hca.ChannelConfig = bitReader.Read(8);
hca.TotalBandCount = bitReader.Read(8);
hca.BaseBandCount = bitReader.Read(8);
hca.StereoBandCount = bitReader.Read(8);
hca.BandsPerHfrGroup = bitReader.Read(8);
hca.MsStereo = bitReader.Read(8);
hca.Reserved = bitReader.Read(8);
headerSize -= 16;
}
else if (headerSize >= 0x0c && (bitReader.Peek(32) & Mask) == StringToUInt32("dec"))
{
bitReader.Skip(32);
hca.FrameSize = bitReader.Read(16);
hca.MinResolution = bitReader.Read(8);
hca.MaxResolution = bitReader.Read(8);
hca.TotalBandCount = bitReader.Read(8) + 1;
hca.BaseBandCount = bitReader.Read(8) + 1;
hca.TrackCount = bitReader.Read(4);
hca.ChannelConfig = bitReader.Read(4);
hca.StereoType = bitReader.Read(8);
if (hca.StereoType == 0)
{
hca.BaseBandCount = hca.TotalBandCount;
}
hca.StereoBandCount = hca.TotalBandCount - hca.BaseBandCount;
hca.BandsPerHfrGroup = 0;
headerSize -= 12;
}
else
{
throw new InvalidDataException("No compression or decode chunk.");
}
if (headerSize >= 8 && (bitReader.Peek(32) & Mask) == StringToUInt32("vbr"))
{
bitReader.Skip(32);
hca.VbrMaxFrameSize = bitReader.Read(16);
hca.VbrNoiseLevel = bitReader.Read(16);
if (hca.FrameSize != 0 || hca.VbrMaxFrameSize <= 8 || hca.VbrMaxFrameSize > 0x1FF)
{
throw new InvalidDataException("Invalid frame size.");
}
headerSize -= 8;
}
if (headerSize >= 6 && (bitReader.Peek(32) & Mask) == StringToUInt32("ath"))
{
bitReader.Skip(32);
hca.AthType = bitReader.Read(16);
}
else
{
hca.AthType = (hca.Version < Version200) ? 1 : 0;
}
if (headerSize >= 16 && (bitReader.Peek(32) & Mask) == StringToUInt32("loop"))
{
bitReader.Skip(32);
hca.LoopStartFrame = bitReader.Read(32);
hca.LoopEndFrame = bitReader.Read(32);
hca.LoopStartDelay = bitReader.Read(16);
hca.LoopEndPadding = bitReader.Read(16);
hca.LoopFlag = true;
if (hca.LoopStartFrame < 0 || hca.LoopStartFrame > hca.LoopEndFrame || hca.LoopEndFrame >= hca.FrameCount)
{
throw new InvalidDataException("Invalid loop frames.");
}
headerSize -= 16;
}
else
{
hca.LoopStartFrame = 0;
hca.LoopEndFrame = 0;
hca.LoopStartDelay = 0;
hca.LoopEndPadding = 0;
hca.LoopFlag = false;
}
if (headerSize >= 6 && (bitReader.Peek(32) & Mask) == StringToUInt32("ciph"))
{
bitReader.Skip(32);
hca.CiphType = bitReader.Read(16);
if (hca.CiphType != 0 && hca.CiphType != 1 && hca.CiphType != 56)
{
throw new InvalidDataException("Invalid cipher type.");
}
headerSize -= 6;
}
if (headerSize >= 8 && (bitReader.Peek(32) & Mask) == StringToUInt32("rva"))
{
bitReader.Skip(32);
int rvaVolumeInt = bitReader.Read(32);
hca.RvaVolume = BitConverter.ToSingle(BitConverter.GetBytes(rvaVolumeInt));
headerSize -= 8;
}
else
{
hca.RvaVolume = 1.0f;
}
if (headerSize >= 5 && (bitReader.Peek(32) & Mask) == StringToUInt32("comm"))
{
bitReader.Skip(32);
hca.CommentLength = bitReader.Read(8);
if (hca.CommentLength > headerSize)
{
throw new InvalidDataException("Comment string out of bounds.");
}
StringBuilder commentStringBuilder = new();
for (int i = 0; i < hca.CommentLength; i++)
{
commentStringBuilder.Append(bitReader.Read(8));
}
hca.Comment = commentStringBuilder.ToString();
}
else
{
hca.CommentLength = 0;
}
// IDE0059
//if (headerSize >= 4 && (bitReader.Peek(32) & Mask) == StringToUInt32("pad"))
//{
// headerSize -= (headerSize - 2);
//}
if (hca.FrameSize < MinFrameSize || hca.FrameSize > MaxFrameSize)
{
throw new InvalidDataException("Invalid frame size.");
}
if (hca.Version <= Version200)
{
if (hca.MinResolution != 1 || hca.MaxResolution != 15)
{
throw new InvalidDataException("Incompatible resolution.");
}
}
if (hca.TrackCount == 0)
{
hca.TrackCount = 1;
}
if (hca.TrackCount > hca.ChannelCount)
{
throw new InvalidDataException("Invalid track count.");
}
if (hca.TotalBandCount > SamplesPerSubframe ||
hca.BaseBandCount > SamplesPerSubframe ||
hca.StereoBandCount > SamplesPerSubframe ||
hca.BaseBandCount + hca.StereoBandCount > SamplesPerSubframe ||
hca.BandsPerHfrGroup > SamplesPerSubframe)
{
throw new InvalidDataException("Invalid bands.");
}
hca.HfrGroupCount = HeaderCeil2(
hca.TotalBandCount - hca.BaseBandCount - hca.StereoBandCount,
hca.BandsPerHfrGroup);
hca.AthCurve = Ath.Init(hca.AthType, hca.SampleRate);
hca.CipherTable = Cipher.Init(hca.CiphType, hca.KeyCode);
int channelsPerTrack = hca.ChannelCount / hca.TrackCount;
ChannelType[] channelTypes = new ChannelType[channelsPerTrack];
for (int i = 0; i < channelTypes.Length; i++)
{
channelTypes[i] = ChannelType.Discrete;
}
if (hca.StereoBandCount > 0 && channelsPerTrack > 1)
{
for (int i = 0; i < hca.TrackCount; i++)
{
switch (channelsPerTrack)
{
case 2:
case 3:
channelTypes[0] = ChannelType.StereoPrimary;
channelTypes[1] = ChannelType.StereoSecondary;
break;
case 4:
channelTypes[0] = ChannelType.StereoPrimary;
channelTypes[1] = ChannelType.StereoSecondary;
if (hca.ChannelConfig == 0)
{
channelTypes[2] = ChannelType.StereoPrimary;
channelTypes[3] = ChannelType.StereoSecondary;
}
break;
case 5:
channelTypes[0] = ChannelType.StereoPrimary;
channelTypes[1] = ChannelType.StereoSecondary;
if (hca.ChannelConfig <= 2)
{
channelTypes[3] = ChannelType.StereoPrimary;
channelTypes[4] = ChannelType.StereoSecondary;
}
break;
case 6:
case 7:
channelTypes[0] = ChannelType.StereoPrimary;
channelTypes[1] = ChannelType.StereoSecondary;
channelTypes[4] = ChannelType.StereoPrimary;
channelTypes[5] = ChannelType.StereoSecondary;
break;
case 8:
channelTypes[0] = ChannelType.StereoPrimary;
channelTypes[1] = ChannelType.StereoSecondary;
channelTypes[4] = ChannelType.StereoPrimary;
channelTypes[5] = ChannelType.StereoSecondary;
channelTypes[6] = ChannelType.StereoPrimary;
channelTypes[7] = ChannelType.StereoSecondary;
break;
default:
break;
}
}
}
hca.Channels = new Channel[hca.ChannelCount];
for (int i = 0; i < hca.ChannelCount; i++)
{
hca.Channels[i] = new Channel
{
Type = channelTypes[i],
CodedCount =
channelTypes[i] != ChannelType.StereoSecondary ?
hca.BaseBandCount + hca.StereoBandCount :
hca.BaseBandCount
};
}
hca.Random = DefaultRandom;
if (hca.MsStereo > 0)
{
throw new InvalidDataException();
}
if (hca.HfrGroupCount > 0 && hca.Version == Version300)
{
throw new InvalidDataException();
}
}
