/// <summary>
///
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static DSP ToDSP(byte[] data)
{
DSP dsp = new DSP();
dsp.Channels.Clear();
using (BinaryReaderExt r = new BinaryReaderExt(new MemoryStream(data)))
{
r.BigEndian = true;
if (new string(r.ReadChars(7)) != " HALPST")
{
throw new NotSupportedException("Invalid HPS file");
}
r.ReadByte();
dsp.Frequency = r.ReadInt32();
var channelCount = r.ReadInt32();
if (channelCount != 2)
{
throw new NotSupportedException("Only HPS with 2 channels are currently supported");
}
for (int i = 0; i < channelCount; i++)
{
var channel = new DSPChannel();
channel.LoopFlag = r.ReadInt16();
channel.Format = r.ReadInt16();
var SA = r.ReadInt32();
var EA = r.ReadInt32();
var CA = r.ReadInt32();
for (int k = 0; k < 0x10; k++)
{
channel.COEF[k] = r.ReadInt16();
}
channel.Gain = r.ReadInt16();
channel.InitialPredictorScale = r.ReadInt16();
channel.InitialSampleHistory1 = r.ReadInt16();
channel.InitialSampleHistory1 = r.ReadInt16();
channel.NibbleCount = EA - CA;
channel.LoopStart = SA - CA;
dsp.Channels.Add(channel);
}
// read blocks
r.Position = 0x80;
Dictionary <int, int> OffsetToLoopPosition = new Dictionary <int, int>();
List <byte> channelData1 = new List <byte>();
List <byte> channelData2 = new List <byte>();
while (true)
{
var pos = r.Position;
var length = r.ReadInt32();
var lengthMinusOne = r.ReadInt32();
var next = r.ReadInt32();
{
var initPS = r.ReadInt16();
var initsh1 = r.ReadInt16();
var initsh2 = r.ReadInt16();
var gain = r.ReadInt16();
}
{
var initPS = r.ReadInt16();
var initsh1 = r.ReadInt16();
var initsh2 = r.ReadInt16();
var gain = r.ReadInt16();
}
var extra = r.ReadInt32();
OffsetToLoopPosition.Add((int)pos, channelData1.Count * 2);
channelData1.AddRange(r.ReadBytes(length / 2));
channelData2.AddRange(r.ReadBytes(length / 2));
if (next < r.Position || next == -1)
{
if (next != -1)
{
foreach (var c in dsp.Channels)
{
c.LoopStart = OffsetToLoopPosition[next];
}
}
break;
}
else
{
r.Position = (uint)next;
}
}
dsp.Channels[0].Data = channelData1.ToArray();
dsp.Channels[1].Data = channelData2.ToArray();
}
return(dsp);
}
/// <summary>
///
/// </summary>
/// <param name="dsp"></param>
/// <param name="filePath"></param>
public static void SaveDSPAsHPS(DSP dsp, string filePath)
{
using (BinaryWriterExt w = new BinaryWriterExt(new FileStream(filePath, FileMode.Create)))
{
w.BigEndian = true;
w.Write(" HALPST".ToCharArray());
w.Write((byte)0);
w.Write(dsp.Frequency);
w.Write(dsp.Channels.Count);
// channel meta data
foreach (var c in dsp.Channels)
{
w.Write((short)1);
w.Write(c.Format);
w.Write(2);
w.Write(dsp.Channels[0].Data.Length * 2);
w.Write(2);
for (int k = 0; k < 0x10; k++)
{
w.Write(c.COEF[k]);
}
w.Write(c.Gain);
w.Write(c.InitialPredictorScale);
w.Write(c.InitialSampleHistory1);
w.Write(c.InitialSampleHistory2);
}
// now divide into chunks taking into account loop point
var loopStart = dsp.Channels[0].LoopStart / 2;
if (loopStart == 0)
{
loopStart = int.MaxValue;
}
if (loopStart % 56 == 0)
{
loopStart += 56 - (loopStart % 56);
}
var loopPosition = -1;
var nextPosition = 0;
int[] history = new int[dsp.Channels.Count];
int i;
for (i = 0; i < dsp.Channels[0].Data.Length;)
{
var chunkSize = 0x10000 / dsp.Channels.Count;
if (i < loopStart && i + chunkSize > loopStart && loopStart % chunkSize > 0)
{
chunkSize = loopStart % chunkSize;
}
if (i >= loopStart && loopPosition == -1)
{
loopPosition = (int)w.BaseStream.Position;
}
if (i + chunkSize > dsp.Channels[0].Data.Length)
{
chunkSize = dsp.Channels[0].Data.Length - i;
}
if (chunkSize % 0x20 != 0)
{
chunkSize += 0x20 - (chunkSize % 0x20);
}
var chunkStart = w.BaseStream.Position;
w.BaseStream.Position = nextPosition;
if (nextPosition != 0)
{
w.Write((int)chunkStart);
}
w.BaseStream.Position = chunkStart;
w.Write(chunkSize * 2);
w.Write(chunkSize * 2 - 1);
nextPosition = (int)w.BaseStream.Position;
w.Write(0); // next offsets
for (var j = 0; j < history.Length; j++)
{
w.Write((short)dsp.Channels[j].Data[i]);
w.Write(history[j]);
w.Write((short)0);
}
w.Write(0); //padding
for (var j = 0; j < history.Length; j++)
{
var c = dsp.Channels[j];
byte[] chunk = new byte[chunkSize];
var unpaddedChunk = chunkSize;
if (i + unpaddedChunk > dsp.Channels[0].Data.Length)
{
unpaddedChunk = dsp.Channels[0].Data.Length - i;
}
Array.Copy(c.Data, i, chunk, 0, unpaddedChunk);
var dec = VGAudio.Codecs.GcAdpcm.GcAdpcmDecoder.Decode(chunk, c.COEF);
history[j] = (ushort)dec[dec.Length - 2] | ((ushort)dec[dec.Length - 1] << 16);
w.Write(chunk);
}
i += chunkSize;
}
w.BaseStream.Position = nextPosition;
w.Write(loopPosition);
}
}