Method _readHeader

Engine/source/sfx/media/sfxWavStream.cpp:120–228

}

bool SFXWavStream::_readHeader()
{
   // We read the wav chunks to gather than header info
   // and find the start and end position of the data chunk. 
   mDataStart = -1;

   WAVFileHdr fileHdr;
   mStream->read( 4, &fileHdr.id[0] );
   mStream->read( &fileHdr.size );
   mStream->read( 4, &fileHdr.type[0] );

   fileHdr.size=((fileHdr.size+1)&~1)-4;

   WAVChunkHdr chunkHdr;
   mStream->read( 4, &chunkHdr.id[0] );
   mStream->read( &chunkHdr.size );

   // Unread chunk data rounded up to nearest WORD.
   S32 chunkRemaining = chunkHdr.size + ( chunkHdr.size & 1 );

   WAVFmtHdr   fmtHdr;
   WAVFmtExHdr fmtExHdr;
   WAVSmplHdr  smplHdr;

   dMemset(&fmtHdr, 0, sizeof(fmtHdr));

   while ((fileHdr.size!=0) && (mStream->getStatus() != Stream::EOS))
   {
      // WAV format header chunk.
      if ( !dStrncmp( (const char*)chunkHdr.id, "fmt ", 4 ) )
      {
         mStream->read(&fmtHdr.format);
         mStream->read(&fmtHdr.channels);
         mStream->read(&fmtHdr.samplesPerSec);
         mStream->read(&fmtHdr.bytesPerSec);
         mStream->read(&fmtHdr.blockAlign);
         mStream->read(&fmtHdr.bitsPerSample);

         if ( fmtHdr.format == 0x0001 )
         {
            mFormat.set( fmtHdr.channels, fmtHdr.bitsPerSample * fmtHdr.channels, fmtHdr.samplesPerSec );
            chunkRemaining -= sizeof( WAVFmtHdr );
         }
         else
         {
            mStream->read(sizeof(WAVFmtExHdr), &fmtExHdr);
            chunkRemaining -= sizeof(WAVFmtExHdr);
         }
      }

      // WAV data chunk
      else if (!dStrncmp((const char*)chunkHdr.id,"data",4))
      {
         // TODO: Handle these other formats in a more graceful manner!

         if (fmtHdr.format==0x0001)
         {
            mDataStart = mStream->getPosition();