172 lines
5.7 KiB
Python
172 lines
5.7 KiB
Python
'''
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Base classes for components to import.
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'''
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from PyQt5 import uic, QtCore, QtWidgets
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import os
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class Component(QtCore.QObject):
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'''
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A class for components to inherit. Read comments for documentation
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on making a valid component. All subclasses must implement this signal:
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modified = QtCore.pyqtSignal(int, bool)
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'''
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def __init__(self, moduleIndex, compPos, core):
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super().__init__()
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self.currentPreset = None
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self.canceled = False
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self.moduleIndex = moduleIndex
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self.compPos = compPos
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self.core = core
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def __str__(self):
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return self.__doc__
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def version(self):
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'''
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Change this number to identify new versions of a component
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'''
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return 1
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def properties(self):
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'''
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Return a list of properties to signify if your component is
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non-animated ('static'), returns sound ('audio'), or has
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encountered an error in configuration ('error').
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'''
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return []
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def error(self):
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'''
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Return a string containing an error message, or None for a default.
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'''
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return
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def cancel(self):
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'''
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Stop any lengthy process in response to this variable
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'''
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self.canceled = True
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def reset(self):
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self.canceled = False
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def update(self):
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'''
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Read your widget values from self.page, then call super().update()
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'''
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self.parent.drawPreview()
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saveValueStore = self.savePreset()
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saveValueStore['preset'] = self.currentPreset
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self.modified.emit(self.compPos, saveValueStore)
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def loadPreset(self, presetDict, presetName):
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'''
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Subclasses take (presetDict, presetName=None) as args.
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Must use super().loadPreset(presetDict, presetName) first,
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then update self.page widgets using the preset dict.
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'''
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self.currentPreset = presetName \
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if presetName is not None else presetDict['preset']
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def preFrameRender(self, **kwargs):
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'''
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Triggered only before a video is exported (video_thread.py)
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self.worker = the video thread worker
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self.completeAudioArray = a list of audio samples
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self.sampleSize = number of audio samples per video frame
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self.progressBarUpdate = signal to set progress bar number
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self.progressBarSetText = signal to set progress bar text
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Use the latter two signals to update the MainWindow if needed
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for a long initialization procedure (i.e., for a visualizer)
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'''
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for key, value in kwargs.items():
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setattr(self, key, value)
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def command(self, arg):
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'''
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Configure a component using argument from the commandline.
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Use super().command(arg) at the end of a subclass's method,
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if no arguments are found in that method first
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'''
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if arg.startswith('preset='):
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_, preset = arg.split('=', 1)
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path = os.path.join(self.core.getPresetDir(self), preset)
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if not os.path.exists(path):
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print('Couldn\'t locate preset "%s"' % preset)
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quit(1)
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else:
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print('Opening "%s" preset on layer %s' % (
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preset, self.compPos)
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)
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self.core.openPreset(path, self.compPos, preset)
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else:
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print(
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self.__doc__, 'Usage:\n'
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'Open a preset for this component:\n'
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' "preset=Preset Name"')
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self.commandHelp()
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quit(0)
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def commandHelp(self):
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'''Print help text for this Component's commandline arguments'''
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def loadUi(self, filename):
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return uic.loadUi(os.path.join(self.core.componentsPath, filename))
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'''
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### Reference methods for creating a new component
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### (Inherit from this class and define these)
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def widget(self, parent):
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self.parent = parent
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page = self.loadUi('example.ui')
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# --- connect widget signals here ---
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self.page = page
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return page
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def previewRender(self, previewWorker):
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width = int(previewWorker.core.settings.value('outputWidth'))
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height = int(previewWorker.core.settings.value('outputHeight'))
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from frame import BlankFrame
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image = BlankFrame(width, height)
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return image
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def frameRender(self, layerNo, frameNo):
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audioArrayIndex = frameNo * self.sampleSize
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width = int(self.worker.core.settings.value('outputWidth'))
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height = int(self.worker.core.settings.value('outputHeight'))
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from frame import BlankFrame
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image = BlankFrame(width, height)
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return image
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def audio(self):
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\'''
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Return audio to mix into master as a tuple with two elements:
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The first element can be:
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- A string (path to audio file),
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- Or an object that returns audio data through a pipe
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The second element must be a dictionary of ffmpeg filters/options
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to apply to the input stream. See the filter docs for ideas:
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https://ffmpeg.org/ffmpeg-filters.html
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\'''
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@classmethod
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def names(cls):
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\'''
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Alternative names for renaming a component between project files.
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\'''
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return []
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'''
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class BadComponentInit(Exception):
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def __init__(self, arg, name):
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string = '''################################
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Mandatory argument "%s" not specified
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in %s instance initialization
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###################################'''
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print(string % (arg, name))
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quit()
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