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Check-in [7c7ce6adb8]

Overview
Comment:Added support for top-down composition
Timelines: family | ancestors | descendants | both | tld
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SHA1: 7c7ce6adb86ec3329d3ccac1a6d7ae84667fffac
User & Date: spiffytech@gmail.com on 2010-11-17 00:07:43
Other Links: branch diff | manifest | tags
Context
2010-11-17
05:32
Now supports minor chords check-in: f02f66468f user: spiffytech@gmail.com tags: tld
00:07
Added support for top-down composition check-in: 7c7ce6adb8 user: spiffytech@gmail.com tags: tld
2010-11-16
19:15
Added todo list Leaf check-in: 3d4ddcbab5 user: spiffytech@gmail.com tags: ply
Changes
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Modified cfg.py from [8e359b2146] to [f6edc4689f]. 

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#!/usr/bin/env python

import os
import random
import sys
import time
random.seed(time.time())
import parse

def main():
    key = "A"
    note_grammars = {
        "u": ["I V V V I I IV u u", "I IV u u", "I VII IV u u"  , "e"],
        "e": [""],
    }
    chord_grammars = {
        "u": ['"I" "IV" "V" "IV" "I" u u', '"I" "VII" "IV" u u', '"I" "V" "IV" u u', "e"],
        "e": [""]
    }
    compose_piece(key, note_grammars)
    compose_piece(key, chord_grammars, chords=True)

def compose_piece(key, grammars, chords=False):
    score = ""
    while len(score.split()) < 10:
        score = "u u u"
        score = generate_score(score, grammars)
    score = parse.parse(score)
    score = transliterate_score(score, key, chords)
    score = generate_csound_score(score)
    print "f1  0   256 10  1 0 3   ; sine wave function table"
    for line in score:
        print line


    composition = {
        "a": {  # Movement block 'a' for reuse throughout the piece
            "melody": {  # Instrument 'melody'
                "csound_parameters": {
                    "instrument": 1,
                },
                "grammars": {  # Notes for this instrument to use in this piece
                    "u": ["I V V V I I IV u u", "I IV u u", "I VII IV u u"  , "e"],
                    "e": [""],
                },
                "score": "u u u",
            },
            "rhythm": {
                "csound_parameters": {
                    "instrument": 1,
                },
                "grammars": {
                    "u": ['"I" "IV"/2 "V"2 "IV" "I" u u', '"I" "VII" "IV" u u', '"I" "V" "IV" u u', "e"],
                    "e": [""]
                },
                "score": "u u u",
            },
        },
        "b": {
            "melody": {  # Instrument 'melody'
                "csound_parameters": {
                    "instrument": 1,
                },
                "grammars": {  # Notes for this instrument to use in this piece
                    "u": ["I V I I/2 IV/2 u u", "I4 IV u u", "I IV IV VI V u u"  , "e"],
                    "e": [""],
                },
                "score": "u u u",
            },
            "rhythm": {
                "csound_parameters": {
                    "instrument": 1,
                },
                "grammars": {
                    "u": ['"I" "IV"/2 "V"2 "IV" "I" u u', '"I" "VII" "IV" u u', '"I" "V" "IV" u u', "e"],
                    "e": [""]
                },
                "score": "u u u",
            },
        },
    }

    for comp_name, comp in composition.iteritems():
        for instr_name, instr in comp.iteritems():
            generated_score = generate_score(instr["score"], instr["grammars"])  # Fill in the scores by generating them based on the grammars
#                composition[comp_name][instr_name][grammar]["score"] = parse.parse(generate_score)  # Return Node/Chord objects
            score = parse.parse(generated_score)  # Return Node/Chord objects

            # Generate timestamps for the notes 
            t = 0
            for note in range(len(score)):
                score[note].time = t
                t += score[note].duration
            composition[comp_name][instr_name]["score"] = score

    # Must be done after all note times keyed in, else you c,an't coordinate melodies with the rhythm chords
    for comp_name, comp in composition.iteritems():
        for instr_name, instr in comp.iteritems():
            composition[comp_name][instr_name]["score"] = transliterate_score(composition[comp_name][instr_name]["score"], key)
#            print "\nMovement %s instrument %s" % (comp_name, instr_name)
#            print composition[comp_name][instr_name]["score"] 
            print "f1  0   256 10  1 0 3   ; sine wave function table"
            final_score = generate_csound_score(composition[comp_name][instr_name]["score"])
            for line in final_score:
                print line
            

def make_scale(key):
    notes = ["A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#"]
    scale = [key]
    pos = notes.index(key)
    progression = [2,2,1,2,2,2,1]
    for p in progression:
        pos = (pos + p) % 12
        scale.append(notes[pos])
    return scale


def generate_score(score, grammars):
    while 1:
        found_substitution = False
        for key,value in grammars.iteritems():
            if score.find(key) != -1:
                found_substitution = True
                while score.find(key) != -1:
                    score = score.replace(key, random.choice(grammars[key]), 1)
                    if len(score) > 200:
                    if len(score.split()) > 200:
                        score = score.replace("u", "")
                        score = score.replace("e", "")
                        return score
        if found_substitution is False:
            break
    return score

def transliterate_score(score, key, chords=False):
def transliterate_score(score, key):
    scale = make_scale(key)
    scale_conversion = {
        "I": 1,
        "II": 2,
        "III": 3,
        "IV": 4,
        "V": 5,
        "VI": 6,
        "VII": 7,
        "VIII": 8,
    }
    keyed_score = []
    if chords is False:
        for i in range(len(score)):
    for i in range(len(score)):
        if isinstance(score[i], parse.Note):
            score[i].value = scale[scale_conversion[score[i].value]-1]
    else:
        else:
        for i in range(len(score)):
            chord = []
            root_note_index = scale.index(key) + scale_conversion[score[i].value]
            chord.append(scale[root_note_index])
            chord.append(scale[(root_note_index+3) % 8])
            chord.append(scale[(root_note_index+5) % 8])
            score[i].chord = chord
    return score
︙

Modified todo.org from [9c9ed49773] to [9bec386f24]. 

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+

* Features [0/5]
- [ ] Top-down composition
- [ ] Transition the melody between chords appropriately
- [ ] Set maximum song length

* Bugs [0/1]
- [ ] Doesn't handle minor chords
- [ ] Duration syntax is absolute, not relative to BPM