length= (MusicBrainz::TRM)

    /*
     * Set the length of an audio stream (in seconds).
     *
     * Note: This method is optional, but if it is called, it must be called
     * after MusicBrainz::TRM#pcm_data and before any calls to
     * MusicBrainz::TRM#generate_signature.
     *
     * Aliases:
     *   MusicBrainz::TRM#set_length
     *   MusicBrainz::TRM#song_length=
     *   MusicBrainz::TRM#set_song_length
     *
     * Examples:
     *   trm.length = 4000
     */
    static VALUE mb_trm_set_length(VALUE self, VALUE len) {