/// <summary>
/// Decode DSP-ADPCM data.
/// </summary>
/// <param name="src">DSP-ADPCM source.</param>
/// <param name="dst">Destination array of samples.</param>
/// <param name="cxt">DSP-APCM context.</param>
/// <param name="samples">Number of samples.</param>
public static void Decode(byte[] src, ref Int16[] dst, ref DspAdpcmInfo cxt, UInt32 samples)
{
//Each DSP-APCM frame is 8 bytes long. It contains 1 header byte, and 7 sample bytes.
//Set initial values.
short hist1 = cxt.yn1;
short hist2 = cxt.yn2;
int dstIndex = 0;
int srcIndex = 0;
//Until all samples decoded.
while (dstIndex < samples)
{
//Get the header.
byte header = src[srcIndex++];
//Get scale and co-efficient index.
UInt16 scale = (UInt16)(1 << (header & 0xF));
byte coef_index = (byte)(header >> 4);
short coef1 = cxt.coefs[coef_index][0];
short coef2 = cxt.coefs[coef_index][1];
//7 sample bytes per frame.
for (UInt32 b = 0; b < 7; b++)
{
//Get byte.
byte byt = src[srcIndex++];
//2 samples per byte.
for (UInt32 s = 0; s < 2; s++)
{
sbyte adpcm_nibble = ((s == 0) ? GetHighNibble(byt) : GetLowNibble(byt));
short sample = Clamp16(((adpcm_nibble * scale) << 11) + 1024 + ((coef1 * hist1) + (coef2 * hist2)) >> 11);
hist2 = hist1;
hist1 = sample;
dst[dstIndex++] = sample;
if (dstIndex >= samples)
{
break;
}
}
if (dstIndex >= samples)
{
break;
}
}
}
}
/// <summary>
/// Encodes the samples.
/// </summary>
/// <returns>The samples.</returns>
/// <param name="samples">Samples.</param>
public static byte[] EncodeSamples(short[] samples, out DspAdpcmInfo info, uint loopStart)
{
//Encod data.
short[] coeffs = GcAdpcmCoefficients.CalculateCoefficients(samples);
byte[] dspAdpcm = GcAdpcmEncoder.Encode(samples, coeffs);
info = new DspAdpcmInfo();
info.coefs = new short[8][];
info.coefs[0] = new short[2];
info.coefs[1] = new short[2];
info.coefs[2] = new short[2];
info.coefs[3] = new short[2];
info.coefs[4] = new short[2];
info.coefs[5] = new short[2];
info.coefs[6] = new short[2];
info.coefs[7] = new short[2];
info.coefs[0][0] = coeffs[0];
info.coefs[0][1] = coeffs[1];
info.coefs[1][0] = coeffs[2];
info.coefs[1][1] = coeffs[3];
info.coefs[2][0] = coeffs[4];
info.coefs[2][1] = coeffs[5];
info.coefs[3][0] = coeffs[6];
info.coefs[3][1] = coeffs[7];
info.coefs[4][0] = coeffs[8];
info.coefs[4][1] = coeffs[9];
info.coefs[5][0] = coeffs[10];
info.coefs[5][1] = coeffs[11];
info.coefs[6][0] = coeffs[12];
info.coefs[6][1] = coeffs[13];
info.coefs[7][0] = coeffs[14];
info.coefs[7][1] = coeffs[15];
//Loop stuff.
if (loopStart > 0)
{
info.loop_yn1 = samples[loopStart - 1];
}
if (loopStart > 1)
{
info.loop_yn2 = samples[loopStart - 2];
}
return(dspAdpcm);
}
/// <summary>
/// Load a wave file.
/// </summary>
/// <param name="b">The byte array.</param>
public void Load(byte[] b)
{
//Read file.
MemoryStream src = new MemoryStream(b);
BinaryDataReader br = new BinaryDataReader(src);
//Get byte order.
br.ByteOrder = ByteOrder = Syroot.BinaryData.ByteOrder.BigEndian;
br.Position = 4;
if (br.ReadUInt16() == CitraFileLoader.ByteOrder.LittleEndian)
{
br.ByteOrder = ByteOrder = Syroot.BinaryData.ByteOrder.LittleEndian;
}
//Get version.
ushort version = br.ReadUInt16();
Major = (byte)((version & 0xFF00) >> 8);
Minor = (byte)(version & 0xFF);
//Get num channels.
br.Position = 0x0E;
ushort numChannels = br.ReadUInt16();
ChannelPans = new ChannelPan[numChannels];
//Get codic. Reference:vgmstream/src/meta/bwav.c .
br.Position = 0x10;
Codic = br.ReadUInt16();
//Get info from first channel.
br.Position = 0x12;
ChannelPans[0] = (ChannelPan)br.ReadUInt16();
SampleRate = br.ReadUInt32();
NumSamples = br.ReadUInt32();
br.ReadUInt32();
DspAdpcmInfo = new DspAdpcmInfo[numChannels];
DspAdpcmInfo[0] = new DspAdpcmInfo();
DspAdpcmInfo[0].coefs = new short[8][];
DspAdpcmInfo[0].coefs[0] = br.ReadInt16s(2);
DspAdpcmInfo[0].coefs[1] = br.ReadInt16s(2);
DspAdpcmInfo[0].coefs[2] = br.ReadInt16s(2);
DspAdpcmInfo[0].coefs[3] = br.ReadInt16s(2);
DspAdpcmInfo[0].coefs[4] = br.ReadInt16s(2);
DspAdpcmInfo[0].coefs[5] = br.ReadInt16s(2);
DspAdpcmInfo[0].coefs[6] = br.ReadInt16s(2);
DspAdpcmInfo[0].coefs[7] = br.ReadInt16s(2);
//Start offsets.
uint[] startOffsets = new uint[numChannels];
startOffsets[0] = br.ReadUInt32();
br.Position += 4;
//Loop info.
Loops = br.ReadUInt32() > 0;
LoopEndSample = br.ReadUInt32();
LoopStartSample = br.ReadUInt32();
//More DSP info.
DspAdpcmInfo[0].pred_scale = DspAdpcmInfo[0].loop_pred_scale = br.ReadUInt16();
DspAdpcmInfo[0].yn1 = DspAdpcmInfo[0].loop_yn1 = br.ReadInt16();
DspAdpcmInfo[0].yn2 = DspAdpcmInfo[0].loop_yn2 = br.ReadInt16();
//Read each channel start offset.
for (int i = 1; i < numChannels; i++)
{
//Get channel pan.
br.Position = i * 0x4C + 0x10 + 0x2;
ChannelPans[i] = (ChannelPan)br.ReadUInt16();
//Start offset.
br.Position = i * 0x4C + 0x10 + 0x30;
startOffsets[i] = br.ReadUInt32();
//Get DSP info.
br.Position = i * 0x4C + 0x10 + 0x10;
DspAdpcmInfo[i] = new DspAdpcmInfo();
DspAdpcmInfo[i].coefs = new short[8][];
DspAdpcmInfo[i].coefs[0] = br.ReadInt16s(2);
DspAdpcmInfo[i].coefs[1] = br.ReadInt16s(2);
DspAdpcmInfo[i].coefs[2] = br.ReadInt16s(2);
DspAdpcmInfo[i].coefs[3] = br.ReadInt16s(2);
DspAdpcmInfo[i].coefs[4] = br.ReadInt16s(2);
DspAdpcmInfo[i].coefs[5] = br.ReadInt16s(2);
DspAdpcmInfo[i].coefs[6] = br.ReadInt16s(2);
DspAdpcmInfo[i].coefs[7] = br.ReadInt16s(2);
br.Position += 20;
DspAdpcmInfo[i].pred_scale = DspAdpcmInfo[i].loop_pred_scale = br.ReadUInt16();
DspAdpcmInfo[i].yn1 = DspAdpcmInfo[i].loop_yn1 = br.ReadInt16();
DspAdpcmInfo[i].yn2 = DspAdpcmInfo[i].loop_yn2 = br.ReadInt16();
}
//Read the wave data.
Data = new SoundNStreamDataBlock(br, startOffsets);
try { br.Dispose(); } catch { }
try { src.Dispose(); } catch { }
}
/// <summary>
/// Create a standard b_stm.
/// </summary>
/// <param name="sampleRate">The sample rate.</param>
/// <param name="numSamples">Number of samples.</param>
/// <param name="samples">Pcm8[][] or Pcm16[][] audio samples.</param>
/// <param name="encoding">If samples is Pcm8[][] always 0. Must be 1 or 2 for if samples is Pcm16[][].</param>
/// <param name="version">The version of the file.</param>
/// <returns></returns>
public static b_stm CreateStream(UInt32 sampleRate, UInt32 numSamples, object samples, byte encoding, byte vMajor, byte vMinor, byte vRevision)
{
b_stm s = new b_stm();
s.fileHeader = new FileHeader("FSTM", ByteOrder.BigEndian, vMajor, vMinor, vRevision, 0, new List <SizedReference>());
s.info = new b_stm.InfoBlock();
s.info.streamSoundInfo = new b_stm.StreamSoundInfo();
s.info.tracks = new List <b_stm.TrackInfo>();
s.info.channels = new List <b_stm.ChannelInfo>();
//Stream info.
s.info.streamSoundInfo = new b_stm.StreamSoundInfo();
s.info.streamSoundInfo.encoding = encoding;
s.info.streamSoundInfo.sampleCount = numSamples;
s.info.streamSoundInfo.sampleRate = sampleRate;
//Channels.
switch (encoding)
{
case EncodingTypes.PCM8:
s.data = new SoundNStreamDataBlock(EncoderFactory.Pcm8ToSignedPcm8(samples as byte[][]), encoding);
for (int i = 0; i < (samples as byte[][]).Length; i++)
{
s.info.channels.Add(new b_stm.ChannelInfo());
}
break;
case EncodingTypes.PCM16:
s.data = new SoundNStreamDataBlock(samples, encoding);
for (int i = 0; i < (samples as Int16[][]).Length; i++)
{
s.info.channels.Add(new b_stm.ChannelInfo());
}
break;
case EncodingTypes.DSP_ADPCM:
s.data = new SoundNStreamDataBlock(EncoderFactory.Pcm16ToDspAdpcmSTM(samples as Int16[][], s), encoding);
s.Update(ByteOrder.BigEndian);
//Get DSP-ADPCM info.
DspAdpcmInfo[] context = new DspAdpcmInfo[s.data.dspAdpcm.Length];
int cCount = 0;
foreach (var channel in s.info.channels)
{
context[cCount] = channel.dspAdpcmInfo;
cCount++;
}
//Create SEEK block.
s.seek = new SoundNStreamSeekBlock(s.data.dspAdpcm, s.info.streamSoundInfo.sampleCount, context);
break;
}
//Tracks.
for (int i = 0; i < s.info.channels.Count; i += 2)
{
s.info.tracks.Add(new b_stm.TrackInfo()
{
volume = 0x64, pan = 0x40, span = 0x0, surroundMode = 0, globalChannelIndexTable = new Table <byte>()
{
entries = new List <byte>()
{
(byte)i
}
}
});
if (i + 1 != s.info.channels.Count)
{
s.info.tracks[s.info.tracks.Count - 1].globalChannelIndexTable.entries.Add((byte)(i + 1));
}
}
s.Update(ByteOrder.BigEndian);
return(s);
}