public void Init(StreamReader.IReader fileReader, UInt64 offset, ref VGM_Stream vgmStream, bool InitReader, UInt64 fileLength)
{
bool loop_flag = (fileReader.Read_32bits(offset + 0x1C) != 0xFFFFFFFF);
int channel_count = (int)fileReader.Read_32bits(offset + 0x10);
int sample_rate = (int)fileReader.Read_32bits(offset + 0x0c);
/* build the VGMSTREAM */
VGM_Utils.allocate_vgmStream(ref vgmStream, channel_count, loop_flag);
vgmStream.vgmLoopFlag = loop_flag;
vgmStream.vgmChannelCount = channel_count;
vgmStream.vgmSampleRate = sample_rate;
vgmStream.vgmTotalSamples = (int)fileReader.Read_32bits(offset + 0x24) / 16 * 28 / channel_count;
vgmStream.vgmLayout = new Interleave();
vgmStream.vgmInterleaveBlockSize = (int)fileReader.Read_32bits(offset + 0x14);
vgmStream.vgmDecoder = new PSX_Decoder();
if (loop_flag)
{
vgmStream.vgmLoopStartSample = ((int)fileReader.Read_32bits(offset + 0x18) * 0x10) / 16 * 28 / vgmStream.vgmChannelCount;
vgmStream.vgmLoopEndSample = ((int)fileReader.Read_32bits(offset + 0x1C) * 0x10) / 16 * 28 / vgmStream.vgmChannelCount;
if (vgmStream.vgmLoopEndSample > vgmStream.vgmTotalSamples)
{
vgmStream.vgmLoopStartSample = ((int)fileReader.Read_32bits(offset + 0x18)) / 16 * 28 / vgmStream.vgmChannelCount;
vgmStream.vgmLoopEndSample = ((int)fileReader.Read_32bits(offset + 0x1C)) / 16 * 28 / vgmStream.vgmChannelCount;
}
}
UInt64 start_offset = offset + 0x28;
if (!VGM_Utils.IsPS2ADPCM(fileReader, start_offset, start_offset + 0x8000))
{
start_offset = offset + 0x800;
if (!VGM_Utils.IsPS2ADPCM(fileReader, start_offset, start_offset + 0x8000))
{
start_offset = offset + 0x28;
vgmStream.vgmDecoder = new PCM16_Decoder();
vgmStream.vgmDecoderType = VGM_Decoder_Type.PCM16BITS;
vgmStream.vgmTotalSamples = (int)fileReader.Read_32bits(offset + 0x24) / 2 / channel_count;
if (loop_flag)
{
vgmStream.vgmLoopStartSample = (int)fileReader.Read_32bits(offset + 0x18);
vgmStream.vgmLoopEndSample = (int)fileReader.Read_32bits(offset + 0x1C);
}
}
}
if (InitReader)
{
for (int i = 0; i < channel_count; i++)
{
vgmStream.vgmChannel[i].fReader = (StreamReader.IReader)Activator.CreateInstance(fileReader.GetType());;
vgmStream.vgmChannel[i].fReader.Open(fileReader.GetFilename());
vgmStream.vgmChannel[i].fReader.SetSessionID(fileReader.GetSessionID());
vgmStream.vgmChannel[i].startOffset = vgmStream.vgmChannel[i].currentOffset = start_offset + (UInt64)(vgmStream.vgmInterleaveBlockSize * i);
}
}
}
public UInt64 IsFormat(StreamReader.IReader fileReader, UInt64 offset, UInt64 length)
{
// Check for Mark ID ("VAGx") where x can be "p","i","s"
if ((fileReader.Read_32bitsBE(offset) & 0xFFFFFF00) != 0x56414700)
{
return(0);
}
uint vagLength = fileReader.Read_32bitsBE(offset + 0x0C) + 0x30;
if (fileReader.Read_32bitsBE(offset + 0x24) == 0x56414778)
{
uint k = 0;
do
{
k += 0x10;
vagLength += 0x10;
}while (fileReader.Read_16bitsBE(offset + fileReader.Read_32bitsBE(offset + 0x0C) + k) != 0x0007);
}
if ((length != (UInt64)(0xFFFFFFFFF)) && (vagLength != length))
{
return(0);
}
// Check for Sample Rate
if (!VGM_Utils.CheckSampleRate(fileReader.Read_32bitsBE(offset + 0x10)))
{
return(0);
}
if (!VGM_Utils.IsPS2ADPCM(fileReader, offset + 0x30, offset + vagLength))
{
return(0);
}
// Filename is stored at offset +0x20
m_Filename = fileReader.Read_String(offset + 0x20, 0x10);
return(vagLength + 0x30);
}