Bluejay RTTTL Parse 

A JavaScript library for Nokia Ring Tone Text Transfer Language (RTTTL) <-> Bluejay ESC startup tunes conversions

About

This library allows conversion between RTTTL strings and Bluejay Startup Melody datastructure - which can played on ESCs with Bluejay firmware.

Bluejay Startup Melody is a bytearray of default length 128, and has a structure like:

| [bpm] | [default octave] | [default duration] | [62 (Temp4, Temp3) values] |
| ------- | :--------------: | :-----------------: | :------------------------: |
| 2 bytes | 1 byte | 1 byte | 124 bytes |

In general,
* The first 4 bytes of the byte array are considered metadata and are ignored by the parer in the ESC firmware.
* Temp3 is the pulse duration - a measure of the frequency of the note
* Temp4 is the number of pulses - a measure of the duration of the note

If you just want to play some RTTTL files online, use the demo player: rtttl-play

Usage

``javascript
> Rtttl.parse('Back to the Future:d=16,o=5,b=200:4g.,p,4c.,p,2f#.,p,g.,p,a.,p,8g,p,8e,p,8c,p,4f#,p,g.,p,a.,p,8g.,p,8d.,p,8g.,p,8d.6,p,4d.6,p,4c#6,p,b.,p,c#.6,p,2d.6');
{ name: 'Back to the Future',
defaults: { duration: '16', octave: '5', bpm: '200' },
melody:
[ { duration: 450, frequency: 784 },
{ duration: 75, frequency: 0 },
{ duration: 450, frequency: 523.3 },
{ duration: 75, frequency: 0 },
{ duration: 900, frequency: 740 },
{ duration: 75, frequency: 0 },
{ duration: 112.5, frequency: 784 },
{ duration: 75, frequency: 0 },
{ duration: 112.5, frequency: 880 },
{ duration: 75, frequency: 0 },
{ duration: 150, frequency: 784 },
{ duration: 75, frequency: 0 },
{ duration: 150, frequency: 659.3 },
{ duration: 75, frequency: 0 },
{ duration: 150, frequency: 523.3 },
{ duration: 75, frequency: 0 },
{ duration: 300, frequency: 740 },
{ duration: 75, frequency: 0 },
{ duration: 112.5, frequency: 784 },
{ duration: 75, frequency: 0 },
{ duration: 112.5, frequency: 880 },
{ duration: 75, frequency: 0 },
{ duration: 225, frequency: 784 },
{ duration: 75, frequency: 0 },
{ duration: 225, frequency: 587.3 },
{ duration: 75, frequency: 0 },
{ duration: 225, frequency: 784 },
{ duration: 75, frequency: 0 },
{ duration: 225, frequency: 587.3 },
{ duration: 75, frequency: 0 },
{ duration: 450, frequency: 587.3 },
{ duration: 75, frequency: 0 },
{ duration: 300, frequency: 1108.7 },
{ duration: 75, frequency: 0 },
{ duration: 112.5, frequency: 987.8 },
{ duration: 75, frequency: 0 },
{ duration: 112.5, frequency: 554.4 },
{ duration: 75, frequency: 0 },
{ duration: 900, frequency: 587.3 } ] }

> Rtttl.toBluejayStartupMelody('Back to the Future:d=16,o=5,b=200:4g.,p,4c.,p,2f#.,p,g.,p,a.,p,8g,p,8e,p,8c,p,4f#,p,g.,p,a.,p,8g.,p,8d.,p,8g.,p,8d.6,p,4d.6,p,4c#6,p,b.,p,c#.6,p,2d.6')
{
data: Uint8Array(128) [
0, 200, 5, 16, 255, 35, 98, 35, 75, 0, 235, 61,
75, 0, 255, 39, 255, 39, 156, 39, 75, 0, 88, 35,
75, 0, 99, 30, 75, 0, 118, 35, 75, 0, 99, 45,
75, 0, 78, 61, 75, 0, 222, 39, 75, 0, 88, 35,
75, 0, 99, 30, 75, 0, 176, 35, 75, 0, 132, 53,
75, 0, 176, 35, 75, 0, 255, 18, 9, 18, 75, 0,
255, 18, 255, 18, 19, 18, 75, 0, 255, 20, 78, 20,
75, 0, 111, 25, 75, 0, 125, 20, 75, 0, 255, 18,
255, 18, 255, 18,
... 28 more items
],
errorCodes: [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0
]
}

> Rtttl.fromBluejayStartupMelody(Rtttl.toBluejayStartupMelody('Back to the Future:d=16,o=5,b=200:4g.,p,4c.,p,2f#.,p,g.,p,a.,p,8g,p,8e,p,8c,p,4f#,p,g.,p,a.,p,8g.,p,8d.,p,8g.,p,8d.6,p,4d.6,p,4c#6,p,b.,p,c#.6,p,2d.6').data)
Melody:b=200,o=5,b=16:4g.,p,4c.,p,2f#.,p,16g.,p,16a.,p,8g,p,8e,p,8c,p,4f#,p,16g.,p,16a.,p,8g.,p,8d.,p,8g.,p,8d6.,p,4d6.,p,4c#6,p,16b.,p,16c#6.,p,2d6.
``