public override int Read(byte[] buffer, int offset, int count)
{
var remaining = Math.Min(count, _remaining);
var result = 0;
var sector = _currentSector.UserData;
while (remaining > 0)
{
buffer[offset] = sector[_offset];
offset++;
_offset++;
_position++;
if (_offset >= _sectorSize)
{
_offset -= _sectorSize;
_sectorEnumerator.MoveNext();
_currentSector = _isoSectorInfoDecoder.Decode(_sectorEnumerator.Current);
sector = _currentSector.UserData;
}
remaining--;
_remaining--;
result++;
}
return(result);
}
public IsoSectorStream(int sectorSize, IEnumerable <ICdSector> sectors, IIsoSectorInfoDecoder isoSectorInfoDecoder, long?length)
{
_sectorSize = sectorSize;
_isoSectorInfoDecoder = isoSectorInfoDecoder;
_sectorEnumerator = sectors.GetEnumerator();
_sectorEnumerator.MoveNext();
_currentSector = _isoSectorInfoDecoder.Decode(_sectorEnumerator.Current);
_remaining = length ?? long.MaxValue;
_length = length;
}
public IsoSectorInfo Decode(ICdSector sector)
{
var result = new IsoSectorInfo
{
Number = sector.Number,
Data = sector.Data,
UserDataOffset = 0,
UserDataLength = 2352
};
var data = sector.Data;
if (!(data[0x0000] == 0x00 &&
data[0x0001] == 0xFF &&
data[0x0002] == 0xFF &&
data[0x0003] == 0xFF &&
data[0x0004] == 0xFF &&
data[0x0005] == 0xFF &&
data[0x0006] == 0xFF &&
data[0x0007] == 0xFF &&
data[0x0008] == 0xFF &&
data[0x0009] == 0xFF &&
data[0x000A] == 0xFF &&
data[0x000B] == 0x00))
{
return(result);
}
result.Minutes = Bcd.Decode(data[0x000C]);
result.Seconds = Bcd.Decode(data[0x000D]);
result.Frames = Bcd.Decode(data[0x000E]);
result.Mode = data[0x000F];
switch (result.Mode)
{
case 0x01:
result.UserDataOffset = 16;
result.UserDataLength = 2048;
result.EdcOffset = 2064;
result.EccOffset = 2072;
break;
case 0x02:
result.UserDataOffset = 24;
result.Id = data[0x0010];
result.Channel = data[0x0011];
result.EndOfRecord = (data[0x0012] & 0x01) != 0;
result.IsVideo = (data[0x0012] & 0x02) != 0;
result.IsAudio = (data[0x0012] & 0x04) != 0;
result.IsData = (data[0x0012] & 0x08) != 0;
result.Trigger = (data[0x0012] & 0x10) != 0;
result.Form = (data[0x0012] & 0x020) != 0 ? 2 : 1;
result.IsTimeDependent = (data[0x0012] & 0x40) != 0;
result.EndOfFile = (data[0x0012] & 0x80) != 0;
if (result.IsAudio ?? false)
{
switch (data[0x0013] & 0x03)
{
case 0x0:
result.AudioChannels = 1;
break;
case 0x1:
result.AudioChannels = 2;
break;
}
switch (data[0x0013] & 0x0C)
{
case 0x0:
result.AudioRate = 37800;
break;
case 0x4:
result.AudioRate = 18900;
break;
}
switch (data[0x0013] & 0x30)
{
case 0x00:
result.AudioBitsPerSample = 4;
break;
case 0x10:
result.AudioBitsPerSample = 8;
break;
}
result.AudioEmphasis = (data[0x0013] & 0x40) != 0;
}
switch (result.Form ?? 1)
{
case 1:
result.UserDataLength = 2048;
result.EdcOffset = 2072;
result.EccOffset = 2076;
break;
case 2:
result.UserDataLength = (result.IsAudio ?? false) ? 2304 : 2324;
result.EdcOffset = 2348;
break;
}
break;
}
return(result);
}
