FOURCC
header.riff.riff_id = FOURCC('R','I','F','F');
header.riff.wave_id = FOURCC('W','A','V','E');
header.format_chunk.fourcc = FOURCC('f','m','t',' ');
header.data_chunk.fourcc = FOURCC('d','a','t','a');
header.riff.riff_id = FOURCC('R','I','F','F');
header.riff.wave_id = FOURCC('W','A','V','E');
header.format_chunk.fourcc = FOURCC('f','m','t',' ');
header.data_chunk.fourcc = FOURCC('d','a','t','a');