if(decoder->guts->has_stream_header&&decoder->guts->stream_header.data.stream_info.min_blocksize==decoder->guts->stream_header.data.stream_info.max_blocksize)/* i.e. it's a fixed-blocksize stream */
if(decoder->guts->has_stream_info&&decoder->guts->stream_info.data.stream_info.min_blocksize==decoder->guts->stream_info.data.stream_info.max_blocksize)/* i.e. it's a fixed-blocksize stream */
if(decoder->guts->has_stream_header&&decoder->guts->stream_header.data.stream_info.min_blocksize==decoder->guts->stream_header.data.stream_info.max_blocksize)/* i.e. it's a fixed-blocksize stream */
if(decoder->guts->has_stream_info&&decoder->guts->stream_info.data.stream_info.min_blocksize==decoder->guts->stream_info.data.stream_info.max_blocksize)/* i.e. it's a fixed-blocksize stream */