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394 lines
18 KiB
394 lines
18 KiB
#! /usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Copyright 2021, Nils Hilbricht, Germany ( https://www.hilbricht.net )
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This file is part of Patroneo ( https://www.laborejo.org )
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Laborejo is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import logging; logger = logging.getLogger(__name__); logger.info("import")
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#Standard Library Modules
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from typing import List, Set, Dict, Tuple
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from warnings import warn
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from statistics import median
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#Third Party Modules
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from calfbox import cbox
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DEFAULT_VELOCITY = 90
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class Pattern(object):
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"""A pattern can be in only one track.
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In fact a pattern IS a track.
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Having it as its own class is only for code readability
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A pattern is an unordered list of dicts.
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Each dict is an step, or a note.
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Only existing steps (Switched On) are in self.data
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{"index": from 0 to parentTrack.parentData.howManyUnits * stretchfactor. But can be higher, will just not be played or exported.,
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"factor": float,
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"pitch": int 0-7,
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"velocity":int 0-127,
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}
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The pitch is determined by an external scale, which is a list of midi pitches.
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Our "pitch" is an index in this list.
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The scale works in screen coordinates(rows and columns).
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So usually the highest values comes first.
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We do force the correct order of on and off for the same pitch by cutting off the previous
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note.
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The pattern has always its maximum length.
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"""
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def __init__(self, parentTrack, data:List[dict]=None, scale:Tuple[int]=None, simpleNoteNames:List[str]=None):
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self._prepareBeforeInit()
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self.parentTrack = parentTrack
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self.scale = scale if scale else (72, 71, 69, 67, 65, 64, 62, 60) #Scale needs to be set first because on init/load data already depends on it, at least the default scale. The scale is part of the track meta callback.
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self.data = data if data else list() #For content see docstring. this cannot be the default parameter because we would set the same list for all instances.
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self.simpleNoteNames = simpleNoteNames if simpleNoteNames else self.parentTrack.parentData.lastUsedNotenames[:] #This is mostly for the GUI or other kinds of representation instead midi notes
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assert self.simpleNoteNames
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self._processAfterInit()
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def _prepareBeforeInit(self):
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self._cachedTransposedScale = {}
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def _processAfterInit(self):
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self.averageVelocity = DEFAULT_VELOCITY # cached on each build
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self._exportCacheVersion = 0 # increased each time the cache is renewed. Can be used to check for changes in the pattern itself.
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self.exportCache = [] #filled in by self.buildExportCache. Used by parentTrack.export() to send to the GUI
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self.buildExportCache()
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self._builtPatternCache = {} #holds a ready cbox pattern for a clip as value. Key is a tuple of hashable parameters. see self.buildPattern
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def copyData(self):
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"""Return only the data as copy.
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Used by other functions and api-Undo"""
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data = [note.copy() for note in self.data] #list of mutable dicts. Dicts have only primitve data types inside
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return data
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def copy(self, newParentTrack):
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"""Return an independent copy of this pattern as Pattern() instance"""
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data = self.copyData()
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scale = self.scale #it is immutable so there is no risk of changing it in place for both patterns at once
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simpleNoteNames = self.simpleNoteNames[:] #this mutable list always gets replaced completely by setting a new list, but we don't want to take any chances and create a slice copy.
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result = Pattern(newParentTrack, data, scale, simpleNoteNames)
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return result
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@property
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def scale(self):
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return self._scale
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@scale.setter
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def scale(self, value):
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"""The scale can never be modified in place! Only replace it with a different list.
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For that reason we keep scale an immutable tuple instead of a list.
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The number of steps are determined by the scale length
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"""
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self._scale = tuple(value)
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self.createCachedTonalRange()
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@property
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def simpleNoteNames(self):
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return self._simpleNoteNames
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@simpleNoteNames.setter
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def simpleNoteNames(self, value):
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self._simpleNoteNames = tuple(value) #we keep it immutable, this is safer to avoid accidental linked structures when creating a clone.
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self.parentTrack.parentData.lastUsedNotenames = self._simpleNoteNames #new default for new tracks
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@property
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def numberOfSteps(self):
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return len(self.scale)
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def fill(self):
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"""Create a 2 dimensional array"""
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l = len(self.scale)
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lst = []
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vel = self.averageVelocity
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for index in range(self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator):
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for pitchindex in range(l):
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lst.append({"index":index, "factor": 1, "pitch": pitchindex, "velocity":vel})
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self.data = lst
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def empty(self):
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self.data = []
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def invert(self):
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l = len(self.scale)
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lst = []
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existing = [(d["index"], d["pitch"]) for d in self.data]
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vel = self.averageVelocity
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for index in range(self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator):
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for pitchindex in range(l):
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if not (index, pitchindex) in existing:
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lst.append({"index":index, "factor": 1, "pitch": pitchindex, "velocity":vel})
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self.data = lst
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def getRow(self, pitchindex):
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"""Returns a row of steps, sorted by index/column.
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Includes the original mutable dictionaries, which can be changed
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"""
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return sorted([d for d in self.data if d["pitch"] == pitchindex], key = lambda i: i["index"])
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def _putRow(self, pitchindex, rowAsListOfSteps):
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"""Replace a row with the given one"""
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self.clearRow(pitchindex)
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self.data.extend(rowAsListOfSteps)
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def clearRow(self, pitchindex):
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"""pure convenience. This could be done with
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repeatFromStep on the first empty step"""
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existingSteps = self.getRow(pitchindex)
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for step in existingSteps:
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self.data.remove(step)
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def _rowAsBooleans(self, pitchindex):
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"""Existence or not"""
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existingSteps = self.getRow(pitchindex)
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existingIndices = set(s["index"] for s in existingSteps)
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result = [False] * self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator
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for i in existingIndices:
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result[i] = True
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return result
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def _getRowWithNoneFillers(self, pitchindex):
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existingSteps = self.getRow(pitchindex)
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result = [None] * self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator
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for st in existingSteps:
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result[st["index"]] = st
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return result
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def _old_repeatFromStep(self, pitchindex, stepIndex):
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"""Includes the given step.
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Uses average velocities
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"""
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vel = self.averageVelocity
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rowAsBools = self._rowAsBooleans(pitchindex)
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toRepeatChunk = rowAsBools[:stepIndex+1]
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numberOfRepeats, rest = divmod(self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator, stepIndex+1)
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index = 0
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newRow = []
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for i in range(numberOfRepeats):
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for b in toRepeatChunk:
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if b:
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newRow.append({"index":index, "factor": 1, "pitch": pitchindex, "velocity":vel})
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index += 1
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self._putRow(pitchindex, newRow)
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def repeatFromStep(self, pitchindex, stepIndex):
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"""Includes the given step.
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Uses original velocities and scale factors
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"""
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originalRow = self._getRowWithNoneFillers(pitchindex)
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toRepeatChunk = originalRow[:stepIndex+1]
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numberOfRepeats, rest = divmod(self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator, stepIndex+1)
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newRow = []
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for i in range(numberOfRepeats):
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for st in toRepeatChunk:
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if st:
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s = st.copy()
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s["index"] = len(toRepeatChunk)*i + s["index"]
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newRow.append(s)
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self._putRow(pitchindex, newRow)
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def invertRow(self, pitchindex):
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vel = self.averageVelocity
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existingSteps = self.getRow(pitchindex)
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existingIndices = set(s["index"] for s in existingSteps)
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for step in existingSteps:
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self.data.remove(step)
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for index in range(self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator):
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if not index in existingIndices:
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self.data.append({"index":index, "factor": 1, "pitch": pitchindex, "velocity":vel})
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def stepByIndexAndPitch(self, index, pitch):
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for d in self.data:
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if d["index"] == index and d["pitch"] == pitch:
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return d
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return None
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def createCachedTonalRange(self):
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"""Take the existing scale and generate all possible notes for it. This way we don't
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need to regenerate them each time the pattern change.
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This is meant to return a midi pitch. However, not all 128 are possible."""
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#We create three full octaves because the code is much easier to write and read. no modulo, no divmod.
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#We may not present all of them to the user.
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self._cachedTransposedScale.clear()
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for step in range(self.numberOfSteps):
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self._cachedTransposedScale[step] = self.scale[step]
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if not step+7 in self._cachedTransposedScale:
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self._cachedTransposedScale[step+7] = self.scale[step] - 12 #yes, that is correct. We do top-bottom for our steps.
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if not step-7 in self._cachedTransposedScale:
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self._cachedTransposedScale[step-7] = self.scale[step] + 12
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def buildExportCache(self):
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"""Called by the api directly and once on init/load"""
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self.exportCache = [] #only used by parentTrack.export()
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patternOnlyCurrentHowManyUnits = (p for p in self.data if p["index"] < self.parentTrack.parentData.howManyUnits * self.parentTrack.patternLengthMultiplicator) # < and not <= because index counts from 0 but howManyUnits counts from 1
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patternOnlyCurrentNumberOfSteps = (p for p in patternOnlyCurrentHowManyUnits if p["pitch"] < self.numberOfSteps)
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for pattern in patternOnlyCurrentNumberOfSteps:
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note = {}
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note["pitch"] = pattern["pitch"]
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note["index"] = pattern["index"]
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note["factor"] = pattern["factor"] #size multiplier -> longer or short note
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note["velocity"] = pattern["velocity"]
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note["midipitch"] = self.scale[pattern["pitch"]] #we always report the untransposed note. For a GUI the pattern gets transposed, not the note.
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note["exceedsPlayback"] = False #This is set by buildPattern.
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self.exportCache.append(note)
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#self.averageVelocity = int( sum((n["velocity"] for n in self.data)) / len(self.data) ) if self.data else DEFAULT_VELOCITY
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self.averageVelocity = int(median(n["velocity"] for n in self.data)) if self.data else DEFAULT_VELOCITY
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self._exportCacheVersion += 1 #used by build pattern for its cache hash
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def buildPattern(self, scaleTransposition, halftoneTransposition, howManyUnits, whatTypeOfUnit, subdivisions, patternLengthMultiplicator):
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"""return a cbox pattern ready to insert into a cbox clip.
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This is the function to communicate with the outside, e.g. the track.
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All ticks are relativ to the pattern start
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We cache internally, but for the outside it looks like we generate a new pattern each time
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on each little note update or transposition change.
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The cache restores the cbox-pattern, not the note configuration in our python data. It is
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used for placing the same pattern into multiple measures. But _not_ to return to a note
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configuration we already had once. If you change the pattern itself the cache is cleared.
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For that we keep the _exportCacheVersion around.
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Actually we do not clear the cache, we simply let it sit.
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#TODO: since exportCacheVersion is basically a very basic hash of the grid status we could use it to also cache buildExportCache. Profile on a slow system first!
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Relevant for caching:
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scaleTransposition
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halftoneTransposition
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howManyUnits
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whatTypeOfUnit
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subdivisions
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scale (as tuple so it is hashable)
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self._exportCacheVersion
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patternLengthMultiplicator
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_cachedTransposedScale is updated with self.scale changes and therefore already covered.
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Shuffle / Swing:
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subdivisions is the "group size" of the GUI. Default=1. GUI allows 1, 2, 3, 4 only.
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They are the eights, triplets and 16th notes of a measure, if we assume quarters as the base duration (->whatTypeOfUnit)
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We imagine shuffle as the point where the first note ends and the second begins.
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This divider is shifted to the left or right (earlier/later) but the overall duration of the sum remains the same.
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The start tick of the first note is not touched and the end tick of the second note is not touched.
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Shuffle is a value between -0.5 and 0.5, where 0 means no difference.
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0.5 makes the second note so short it doesn't really exist
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-0.5 makes the first extremely short.
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Value experiments:
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0.05 is very subtle but if you know that it is there you'll hear it
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0.1 is already very audible.
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0.15 is smooth, jazzy. Good for subdivisions=2, too sharp for subdivisions=4
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0.25 is "hopping", does not feel like swing at all, but "classical"
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0.333 is very sharp.
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A lookup-table function to musically map from -100% to 100% has been provided by the API
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api.swingPercentToAbsolute
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"""
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cacheHash = (scaleTransposition, halftoneTransposition, howManyUnits, whatTypeOfUnit, subdivisions, tuple(self.scale), self._exportCacheVersion, patternLengthMultiplicator)
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try:
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return self._builtPatternCache[cacheHash]
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except KeyError:
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pass
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oneMeasureInTicks = howManyUnits * whatTypeOfUnit
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oneMeasureInTicks /= subdivisions #subdivisions is 1 by default. bigger values mean shorter durations, which is compensated by the user setting bigger howManyUnits manually.
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oneMeasureInTicks = int(oneMeasureInTicks) * patternLengthMultiplicator
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exportPattern = bytes()
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shuffle = int(self.parentTrack.parentData.swing * whatTypeOfUnit)
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for noteDict in self.exportCache:
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index = noteDict["index"]
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startTick = index * whatTypeOfUnit
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endTick = startTick + noteDict["factor"] * whatTypeOfUnit
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startTick /= subdivisions
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endTick /= subdivisions
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if subdivisions > 1 and shuffle != 0 and subdivisions % 2 == 0:
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positionInSubdivisionGroup = index % subdivisions #0 is first note
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if positionInSubdivisionGroup % 2 == 0: #main beats
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endTick += shuffle
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else: #off beats
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startTick += shuffle
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startTick = int(startTick)
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endTick = int(endTick)
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if endTick > oneMeasureInTicks:
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endTick = oneMeasureInTicks #all note off must end at the end of the pattern
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noteDict["exceedsPlayback"] = True
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else:
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noteDict["exceedsPlayback"] = False
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velocity = noteDict["velocity"]
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pitch = self._cachedTransposedScale[noteDict["pitch"] + scaleTransposition] + halftoneTransposition
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exportPattern += cbox.Pattern.serialize_event(startTick, 0x90 + self.parentTrack.midiChannel, pitch, velocity) # note on
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exportPattern += cbox.Pattern.serialize_event(endTick-1, 0x80 + self.parentTrack.midiChannel, pitch, velocity) # note off #-1 ticks to create a small logical gap. Does not affect next note on.
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pattern = cbox.Document.get_song().pattern_from_blob(exportPattern, oneMeasureInTicks)
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self._builtPatternCache[cacheHash] = pattern
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return pattern
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#Save / Load / Export
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def serialize(self)->dict:
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return {
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"scale": self.scale,
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"data": self.data,
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"simpleNoteNames": self.simpleNoteNames,
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}
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@classmethod
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def instanceFromSerializedData(cls, parentTrack, serializedData):
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self = cls.__new__(cls)
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self._prepareBeforeInit()
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self.parentTrack = parentTrack
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#Use setters to trigger side effects like createCachedTonalRange()
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self.scale = serializedData["scale"] #Scale needs to be set first because on init/load data already depends on it, at least the default scale. The scale is part of the track meta callback.
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self.data = serializedData["data"] #For content see docstring.
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self.simpleNoteNames = serializedData["simpleNoteNames"] #This is mostly for the GUI or other kinds of representation instead midi notes
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self._processAfterInit()
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return self
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#No export. Track uses pattern data directly in its own export.
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