/// <summary>
/// Unpacks next section of the compressed replay
/// </summary>
/// <param name="length">The length of the section</param>
/// <returns>The decoded data</returns>
protected byte[] UnpackNextSection(int length)
{
byte[] result = new byte[length];
Decoder decoder = new Decoder();
DecodeBuffer buffer = new DecodeBuffer(result);
decoder.DecodeBuffer = buffer;
int checksum = _reader.ReadInt32();
int blocks = _reader.ReadInt32();
for (int block = 0; block < blocks; block++)
{
// read the length of the next block of encoded data
int encodedLength = _reader.ReadInt32();
// we error if there is no space for the next block of encoded data
if (encodedLength > result.Length - buffer.ResultOffset)
{
throw new Exception("Insufficient space in decode buffer");
}
// read the block of encoded data into the result (decoded data will overwrite).
_reader.Read(result, buffer.ResultOffset, encodedLength);
// skip decoding if the encoded data filled the remaining space
if (encodedLength == Math.Min(result.Length - buffer.ResultOffset, buffer.BufferLength))
{
continue;
}
// set the decode buffer parameters
buffer.EncodedOffset = 0;
buffer.DecodedLength = 0;
buffer.EncodedLength = encodedLength;
// decode the block
if (decoder.DecodeBlock() != 0)
{
throw new Exception("Error decoding block offset " + block);
}
// sanity check the decoded length
if (buffer.DecodedLength == 0 ||
buffer.DecodedLength > buffer.BufferLength ||
buffer.DecodedLength > result.Length)
{
throw new Exception("Decode data length mismatch");
}
// flush the decoded bytes into the result
buffer.WriteDecodedBytes();
}
return result;
}
public static IEnumerable<StereoShortSoundSample> DecodeBlocksStream(Block[] Blocks)
{
var DecodedBlock = new short[28];
var Decoder = new Decoder();
int SamplesOffset = 0;
bool Ended = false;
var LastSample = default(StereoShortSoundSample);
var CurrentSample = default(StereoShortSoundSample);
for (int n = 0; !Ended && (n < Blocks.Length); n++)
{
var CurrentBlock = Blocks[n];
SamplesOffset = 0;
Decoder.DecodeBlock(CurrentBlock, DecodedBlock, ref SamplesOffset);
switch (CurrentBlock.Type)
{
case Block.TypeEnum.None:
// 16 bytes = 56 stereo 44100 samples
foreach (var DecodedMonoSample in DecodedBlock)
{
CurrentSample = new StereoShortSoundSample(DecodedMonoSample, DecodedMonoSample);
yield return StereoShortSoundSample.Mix(LastSample, CurrentSample);
yield return CurrentSample;
LastSample = CurrentSample;
}
break;
case Block.TypeEnum.End:
Ended = true;
break;
}
}
}
public static short[] DecodeBlocks(Block* Blocks, int BlockCount)
{
var Data = new short[28 * BlockCount];
var Decoder = new Decoder();
int SamplesOffset = 0;
for (int n = 0; n < BlockCount; n++)
{
if (Decoder.DecodeBlock(Blocks[n], Data, ref SamplesOffset))
{
//Console.WriteLine("STOP: {0}/{1}", n, BlockCount);
Data = Data.Slice(0, SamplesOffset);
break;
}
}
return Data;
}
