private void UpdateBuffer(AMemory Memory)
{
//TODO: Implement conversion for formats other
//than interleaved stereo (2 channels).
//As of now, it assumes that HostChannelsCount == 2.
WaveBuffer Wb = WaveBuffers[BufferIndex];
if (SampleFormat == SampleFormat.PcmInt16)
{
int SamplesCount = (int)(Wb.Size / (sizeof(short) * ChannelsCount));
Samples = new int[SamplesCount * AudioConsts.HostChannelsCount];
if (ChannelsCount == 1)
{
for (int Index = 0; Index < SamplesCount; Index++)
{
short Sample = Memory.ReadInt16(Wb.Position + Index * 2);
Samples[Index * 2 + 0] = Sample;
Samples[Index * 2 + 1] = Sample;
}
}
else
{
for (int Index = 0; Index < SamplesCount * 2; Index++)
{
Samples[Index] = Memory.ReadInt16(Wb.Position + Index * 2);
}
}
}
else if (SampleFormat == SampleFormat.Adpcm)
{
byte[] Buffer = Memory.ReadBytes(Wb.Position, Wb.Size);
Samples = AdpcmDecoder.Decode(Buffer, AdpcmCtx);
}
else
{
throw new InvalidOperationException();
}
if (SampleRate != AudioConsts.HostSampleRate)
{
//TODO: We should keep the frames being discarded (see the 4 below)
//on a buffer and include it on the next samples buffer, to allow
//the resampler to do seamless interpolation between wave buffers.
int SamplesCount = Samples.Length / AudioConsts.HostChannelsCount;
SamplesCount = Math.Max(SamplesCount - 4, 0);
Samples = Resampler.Resample2Ch(
Samples,
SampleRate,
AudioConsts.HostSampleRate,
SamplesCount,
ref ResamplerFracPart);
}
}
private ElfSym GetSymbol(long Position, long StrTblAddr)
{
int NameIndex = Memory.ReadInt32(Position + 0);
int Info = Memory.ReadByte(Position + 4);
int Other = Memory.ReadByte(Position + 5);
int SHIdx = Memory.ReadInt16(Position + 6);
long Value = Memory.ReadInt64(Position + 8);
long Size = Memory.ReadInt64(Position + 16);
string Name = string.Empty;
for (int Chr; (Chr = Memory.ReadByte(StrTblAddr + NameIndex++)) != 0;)
{
Name += (char)Chr;
}
return(new ElfSym(Name, Info, Other, SHIdx, Value, Size));
}
private AdpcmDecoderContext GetAdpcmDecoderContext(long Position, long Size)
{
if (Size == 0)
{
return(null);
}
AdpcmDecoderContext Context = new AdpcmDecoderContext();
Context.Coefficients = new short[Size >> 1];
for (int Offset = 0; Offset < Size; Offset += 2)
{
Context.Coefficients[Offset >> 1] = Memory.ReadInt16(Position + Offset);
}
return(Context);
}
