sequences.py 文件源码

def find_effect_strips(sequence):
    """
    Takes a single strip and finds effect strips that use it as input
    Returns the effect strip(s) found as a list, ordered by starting frame
    Returns None if no effect was found
    """
    if sequence.type not in SequenceTypes.VIDEO and sequence.type not in SequenceTypes.IMAGE:
        return None

    effect_sequences = (s
                        for s in bpy.context.sequences
                        if s.type in SequenceTypes.EFFECT)
    found_effect_strips = []
    for s in effect_sequences:
        if s.input_1.name == sequence.name:
            found_effect_strips.append(s)
        if s.input_count == 2:
            if s.input_2.name == sequence.name:
                found_effect_strips.append(s)

    found_effect_strips = sorted(found_effect_strips,
                                 key=attrgetter('frame_final_start'))
    return found_effect_strips