mirror of
https://github.com/kkroening/ffmpeg-python.git
synced 2025-04-05 20:11:11 +08:00
91 lines
2.6 KiB
Python
91 lines
2.6 KiB
Python
from __future__ import unicode_literals
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from .dag import get_outgoing_edges
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from ._run import topo_sort
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import os
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import tempfile
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from ffmpeg.nodes import (
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FilterNode,
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InputNode,
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OutputNode,
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Stream,
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stream_operator,
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)
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_RIGHT_ARROW = '\u2192'
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def _get_node_color(node):
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if isinstance(node, InputNode):
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color = '#99cc00'
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elif isinstance(node, OutputNode):
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color = '#99ccff'
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elif isinstance(node, FilterNode):
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color = '#ffcc00'
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else:
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color = None
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return color
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@stream_operator()
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def view(*streams, **kwargs):
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try:
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import graphviz
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except ImportError:
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raise ImportError('failed to import graphviz; please make sure graphviz is installed (e.g. `pip install '
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'graphviz`)')
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filename = kwargs.pop('filename', None)
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show_labels = kwargs.pop('show_labels', True)
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if filename is None:
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filename = tempfile.mktemp()
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nodes = []
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for stream in streams:
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if not isinstance(stream, Stream):
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raise TypeError('Expected Stream; got {}'.format(type(stream)))
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nodes.append(stream.node)
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sorted_nodes, outgoing_edge_maps = topo_sort(nodes)
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graph = graphviz.Digraph()
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graph.attr(rankdir='LR')
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if len(kwargs.keys()) != 0:
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raise ValueError('Invalid kwargs key(s): {}'.format(', '.join(kwargs.keys())))
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for node in sorted_nodes:
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name = node.name
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if '_kwargs' in dir(node) and 'filename' in node._kwargs:
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name = os.path.basename(node._kwargs['filename'])
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color = _get_node_color(node)
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graph.node(str(hash(node)), name, shape='box', style='filled', fillcolor=color)
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outgoing_edge_map = outgoing_edge_maps.get(node, {})
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for edge in get_outgoing_edges(node, outgoing_edge_map):
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kwargs = {}
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up_label = edge.upstream_label
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down_label = edge.downstream_label
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if show_labels and (up_label is not None or down_label is not None):
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if up_label is None:
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up_label = ''
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if down_label is None:
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down_label = ''
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if up_label != '' and down_label != '':
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middle = ' {} '.format(_RIGHT_ARROW)
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else:
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middle = ''
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kwargs['label'] = '{} {} {}'.format(up_label, middle, down_label)
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upstream_node_id = str(hash(edge.upstream_node))
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downstream_node_id = str(hash(edge.downstream_node))
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graph.edge(upstream_node_id, downstream_node_id, **kwargs)
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graph.view(filename)
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__all__ = [
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'view',
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]
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