// Private functions for packing files
// Reads the beginning of each file and verifies it is formatted as a WAVE file. Locates
// the WaveFormatEx structure and start of data. The WaveFormat is stored in the waveFormats container.
// The current stream position is set to the start of the data chunk.
// Note: This function assumes that all stream positions are initially set to the beginning
// of the file. When reading the wave file header, it does not seek to the file start.
private static void ReadAllWaveHeaders(List <FileStream> filesToPackReaders, List <WaveFormatEx> waveFormats, List <IndexEntry> indexEntries)
{
RiffHeader header;
// Read in all the headers and find start of data
for (int i = 0; i < filesToPackReaders.Count; ++i)
{
using (BinaryReader reader = new BinaryReader(filesToPackReaders[i], System.Text.Encoding.ASCII, true))
{
// Read the file header
filesToPackReaders[i].Seek(0, SeekOrigin.Begin);
header = new RiffHeader(reader);
if (header.riffTag != CommonTags.tagRIFF || header.waveTag != CommonTags.tagWAVE)
{
throw new System.Exception("Error reading header from file " + filesToPackReaders[i].Name);
}
// Check that the file size makes sense (matches with header chunk length + 8)
if (header.chunkSize + 8 != filesToPackReaders[i].Length)
{
throw new System.Exception("Chunk size does not match file length in " + filesToPackReaders[i].Name);
}
// Find the format tag
FindChunk(CommonTags.tagFMT_, reader);
// Read in the wave format
WaveFormatEx waveFormat = new WaveFormatEx(reader);
waveFormat.cbSize = 0;
waveFormats.Add(waveFormat);
// Find the start of the data and record length
IndexEntry entry = new IndexEntry();
entry.dataLength = (int)FindChunk(CommonTags.tagDATA, reader);
indexEntries.Add(entry);
// Note: Current stream position is set to the start of the wave data
}
}
}
public WaveHeader(BinaryReader reader)
{
riffHeader = new RiffHeader(reader);
formatChunk = new FormatChunk(reader);
dataChunk = new ChunkHeader(reader);
}