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Adding Tone and RTTTL command support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| # Based on: | ||
| # https://github.com/asdwsda/rtttl | ||
| # GNU GENERAL PUBLIC LICENSE | ||
| # Version 3, 29 June 2007 | ||
|
|
||
| import re | ||
|
|
||
| def remove_whitespaces(string): | ||
| return ''.join(string.split()) | ||
|
|
||
| def parse_rtttl(rtttl_str, strict_note_syntax=False): | ||
| """Parse RTTTL ringtone | ||
| Args: | ||
| rtttl_str (str): RTTTL string to parse | ||
| strict_note_syntax (bool): Some RTTTL generator doesn't strictly follow | ||
| the RTTTL specification and generates a form like | ||
| <note> := [<duration>] <note> [<dot>] [<octave>] <delimiter> | ||
| instead of | ||
| <note> := [<duration>] <note> [<octave>] [<dot>] <delimiter> | ||
| parse_rtttl accepts both forms by default, but it can be set to | ||
| accept valid rtttl notes only. | ||
| Returns: | ||
| A dict containing the ringtone title and notes as frequency, duration pairs. | ||
| For example: | ||
| {'notes': [{'duration': 952.381 , 'frequency': 1396.8}, | ||
| {'duration': 178.571, 'frequency': 1661.2}, | ||
| {'duration': 1904.762, 'frequency': 0}, | ||
| {'duration': 952.381, 'frequency': 1975.6}], | ||
| 'title': 'Example ringtone'} | ||
| """ | ||
| rt = rtttl_str.split("=") | ||
| pp = -1 | ||
| try: | ||
| pp = rt[3].find(":") | ||
| except: | ||
| return {'title':False,'notes':False} | ||
| if pp==-1: | ||
| rt[3] = rt[3].replace(",",":",1) | ||
| rtttl_str = rt[0]+"="+rt[1]+"="+rt[2]+"="+rt[3] | ||
| rtttl_parts = rtttl_str.split(':') | ||
| if len(rtttl_parts) != 3: | ||
| return {'title':False,'notes':False} | ||
| if len(rtttl_parts[2]) == 0: | ||
| return {'title':False,'notes':False} | ||
| defaults = parse_defaults(remove_whitespaces(rtttl_parts[1])) | ||
| parsed_notes = parse_data(remove_whitespaces(rtttl_parts[2]).lower(), strict_note_syntax) | ||
| converted_notes = [convert_note(note, defaults) for note in parsed_notes] | ||
| return {'title': rtttl_parts[0], 'notes': converted_notes} | ||
|
|
||
| def parse_defaults(defaults_str): | ||
| if defaults_str == '': | ||
| return {'duration': 4, 'octave': 6, 'bpm': 63} | ||
| try: | ||
| if re.match(r'^(d=\d{1,2},o=\d,b=\d{1,3})?$', defaults_str): | ||
| defaults = dict([d.split('=') for d in defaults_str.split(',')]) | ||
| parsed_defaults = { | ||
| 'duration': parse_duration(defaults['d']), | ||
| 'octave': parse_octave(defaults['o']), | ||
| 'bpm': parse_bpm(defaults['b']) | ||
| } | ||
| else: | ||
| return {'duration': 4, 'octave': 6, 'bpm': 63} | ||
| except InvalidElementError as element: | ||
| return {'duration': 4, 'octave': 6, 'bpm': 63} | ||
| return parsed_defaults | ||
|
|
||
| def parse_data(notes, strict_note_syntax): | ||
| raw_notes = notes.split(',') | ||
| if not strict_note_syntax: | ||
| raw_notes = [correct_note_syntax(note) for note in raw_notes] | ||
| return [parse_note(note) for note in raw_notes] | ||
|
|
||
| def correct_note_syntax(note): | ||
| return re.sub(r'^(\d{0,2})([pbeh]|[cdfga]#?)(\.?)(\d*)$', r'\1\2\4\3', note) | ||
|
|
||
| def parse_note(note_str): | ||
| try: | ||
| elements = re.findall(r'^(\d{0,2})([pbeh]|[cdfga]#?)(\d?)(\.?)$', note_str)[0] | ||
| funcs = (parse_duration, parse_pitch, parse_octave, has_dot) | ||
| elements = [func(element) for func, element in zip(funcs, elements)] | ||
| except: | ||
| return False | ||
| keys = ('duration', 'pitch', 'octave', 'dot') | ||
| return dict(zip(keys, elements)) | ||
|
|
||
| def parse_duration(duration): | ||
| allowed_duration = [1, 2, 4, 8, 16, 32] | ||
| return parse_int(duration, allowed_duration) | ||
|
|
||
| def parse_octave(octave): | ||
| allowed_octave = [4, 5, 6, 7] | ||
| return parse_int(octave, allowed_octave) | ||
|
|
||
| def parse_bpm(bpm): | ||
| allowed_bpm = [ | ||
| 25, 28, 31, 35, 40, 45, 50, 56, 63, 70, 80, 90, | ||
| 100, 112, 125, 140, 160, 180, 200, 225, 250, 285, | ||
| 320, 355, 400, 450, 500, 565, 635, 715, 800, 900] | ||
| return parse_int(bpm, allowed_bpm) | ||
|
|
||
| def parse_pitch(pitch): | ||
| allowed_pitch = ['p', 'c', 'c#', 'd', 'd#', 'e', 'f', 'f#', 'g', 'g#', 'a', 'a#', 'h', 'b'] | ||
| return parse_element(pitch, allowed_pitch) | ||
|
|
||
| def parse_int(element, allowed): | ||
| if element: | ||
| return parse_element(int(element), allowed) | ||
| return None | ||
|
|
||
| def parse_element(element, allowed): | ||
| if element in allowed: | ||
| return element | ||
| else: | ||
| return False | ||
|
|
||
| def has_dot(dot): | ||
| return dot == '.' | ||
|
|
||
| def convert_note(note, defaults): | ||
| octave_multiplier = {4: 1, 5: 2, 6: 4, 7: 8} | ||
| pitch_frequencies = { | ||
| 'p': 0, | ||
| 'c': 261.6, | ||
| 'c#': 277.2, | ||
| 'd': 293.7, | ||
| 'd#': 311.1, | ||
| 'e': 329.6, | ||
| 'f': 349.2, | ||
| 'f#': 370.0, | ||
| 'g': 392.0, | ||
| 'g#': 415.3, | ||
| 'a': 440.0, | ||
| 'a#': 466.2, | ||
| 'b': 493.9, | ||
| 'h': 493.9 | ||
| } | ||
| msec_per_beat = (60.0 / defaults['bpm']) * 4 * 1000 | ||
| frequency = pitch_frequencies[note['pitch']] * octave_multiplier[note['octave'] or defaults['octave']] | ||
| if note['dot']: | ||
| multiplier = 1.5 | ||
| else: | ||
| multiplier = 1 | ||
| duration = round((msec_per_beat / (note['duration'] or defaults['duration'])) * multiplier, 3) | ||
| return {'frequency': frequency, 'duration': duration} |
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