public AWCFile(Stream stream)
{
this.Stream = stream;
Structs.AWCHeader header = new Structs.AWCHeader(stream);
if ((header.Flags >> 8) != 0xFF)
{
throw new Exception("Unsupported flag");
}
// first bit - means that there are unknown word for each stream after this header
// second bit - I think that it means that not all the tags are in the start of the file, but all the tags of a stream are near the data tag
// third bit - Multi channel audio
if ((header.Flags & 0xF8) != 0)
{
throw new Exception("Unsupported flag");
}
MultiChannel = ((header.Flags & 4) == 4);
// 0x10 - Header size
int audioInfoStart = 0x10 + ((header.Flags & 1) == 1 ? (2 * header.StreamsCount) : 0);
stream.Seek(audioInfoStart, SeekOrigin.Begin);
List <Structs.StreamInfo> info = new List <Structs.StreamInfo>();
Dictionary <int, Dictionary <byte, Structs.ChunkInfo> > streamsChunks = new Dictionary <int, Dictionary <byte, Structs.ChunkInfo> >();
for (int i = 0; i < header.StreamsCount; ++i)
{
info.Add(new Structs.StreamInfo(Stream, header.BigEndian));
}
for (int i = 0; i < header.StreamsCount; ++i)
{
streamsChunks[info[i].Id] = new Dictionary <byte, Structs.ChunkInfo>();
for (int j = 0; j < info[i].TagsCount; ++j)
{
Structs.ChunkInfo chunk = new Structs.ChunkInfo(stream, header.BigEndian);
streamsChunks[info[i].Id][chunk.Tag] = chunk;
}
}
if (MultiChannel)
{
List <Structs.ChannelsInfoChunkItem> streamsInfo = new List <Structs.ChannelsInfoChunkItem>();
Structs.ChannelsInfoChunkHeader channelsInfoHeader;
// Haven't figured out that hash yet
// stream with id 0 is just info on the other channels
using (Stream chunkReader = new ChunkStream(this.Stream, streamsChunks[0][Tag(0x81F95048)]))
{
channelsInfoHeader = new Structs.ChannelsInfoChunkHeader(chunkReader, header.BigEndian);
if (channelsInfoHeader.ChannelsCount != header.StreamsCount - 1)
{
throw new Exception("Unexcepted number of channels");
}
for (int i = 0; i < channelsInfoHeader.ChannelsCount; ++i)
{
streamsInfo.Add(new Structs.ChannelsInfoChunkItem(chunkReader, header.BigEndian));
AudioIds.Add(info[i + 1].Id);
}
}
AudioStreams.Add(new MultiChannelAudio(new ChunkStream(this.Stream, streamsChunks[0][Tag("data")]), channelsInfoHeader, streamsInfo, header.BigEndian));
}
else
{
List <Structs.FormatChunk> streamsInfo = new List <Structs.FormatChunk>();
for (int i = 0; i < header.StreamsCount; ++i)
{
using (Stream chunkReader = new ChunkStream(this.Stream, streamsChunks[info[i].Id][Tag("format")]))
{
AudioStreams.Add(new Audio(new ChunkStream(this.Stream, streamsChunks[info[i].Id][Tag("data")]), new Structs.FormatChunk(chunkReader, header.BigEndian)));
AudioIds.Add(info[i].Id);
}
}
}
// note: there is fourth unknown 0x21E86A3 tag
}
public MultiChannelAudio(Stream data, Structs.ChannelsInfoChunkHeader channelsInfoHeader, List <Structs.ChannelsInfoChunkItem> channelsInfo, bool bigEndian)
{
int chunkSize = 0x800;
List <Stream>[] channelsStreams = new List <Stream> [channelsInfoHeader.ChannelsCount];
List <Tuple <int, int> >[] samples = new List <Tuple <int, int> > [channelsInfoHeader.ChannelsCount];
for (int i = 0; i < channelsInfoHeader.ChannelsCount; ++i)
{
channelsStreams[i] = new List <Stream>();
samples[i] = new List <Tuple <int, int> >();
}
while (data.Position != data.Length)
{
int totalChunks = 0;
long startPos = data.Position;
long pos = startPos;
int[] dataSizes = new int[channelsInfoHeader.ChannelsCount];
int[] firstNewData = new int[channelsInfoHeader.ChannelsCount];
for (int i = 0; i < channelsInfoHeader.ChannelsCount; ++i)
{
Structs.ChannelChunkHeader header = new Structs.ChannelChunkHeader(data, bigEndian);
dataSizes[i] = header.DataSize;
totalChunks += header.Chunks;
samples[i].Add(Tuple.Create(header.SamplesSkip, (int)header.Samples - header.SamplesSkip));
}
int headerSize = totalChunks * 4 + channelsInfoHeader.ChannelsCount * Structs.ChannelChunkHeader.Size;
headerSize += (((-headerSize) % chunkSize) + chunkSize) % chunkSize;
pos += headerSize;
for (int i = 0; i < channelsInfoHeader.ChannelsCount; ++i)
{
channelsStreams[i].Add(new PartialStream(data, pos, dataSizes[i]));
if (channelsInfo[i].RoundSize != 0)
{
dataSizes[i] += (((-dataSizes[i]) % channelsInfo[i].RoundSize) + channelsInfo[i].RoundSize) % channelsInfo[i].RoundSize;
}
pos += dataSizes[i];
}
if (pos - startPos > channelsInfoHeader.BigChunkSize)
{
throw new Exception("Chunks too big");
}
if (totalChunks == 0 || startPos + channelsInfoHeader.BigChunkSize > data.Length)
{
throw new Exception("Unexpected value");
}
// After each chunk, there is header's size zeros block
data.Seek(startPos + channelsInfoHeader.BigChunkSize, SeekOrigin.Begin);
}
for (int i = 0; i < channelsInfoHeader.ChannelsCount; ++i)
{
Channels.Add(new SplittedAudio(channelsStreams[i], samples[i], channelsInfo[i].Samples, channelsInfo[i].SamplesPerSecond));
}
// following the headers, there is a seek table: For each chunk, there is the dword - which is the first sample in the block
}