| from __future__ import unicode_literals |
|
|
| from builtins import str |
| from .dag import get_outgoing_edges |
| from ._run import topo_sort |
| import tempfile |
|
|
| from ffmpeg.nodes import ( |
| FilterNode, |
| get_stream_spec_nodes, |
| InputNode, |
| OutputNode, |
| stream_operator, |
| ) |
|
|
|
|
| _RIGHT_ARROW = '\u2192' |
|
|
|
|
| def _get_node_color(node): |
| if isinstance(node, InputNode): |
| color = '#99cc00' |
| elif isinstance(node, OutputNode): |
| color = '#99ccff' |
| elif isinstance(node, FilterNode): |
| color = '#ffcc00' |
| else: |
| color = None |
| return color |
|
|
|
|
| @stream_operator() |
| def view(stream_spec, detail=False, filename=None, pipe=False, **kwargs): |
| try: |
| import graphviz |
| except ImportError: |
| raise ImportError( |
| 'failed to import graphviz; please make sure graphviz is installed (e.g. `pip install ' |
| 'graphviz`)' |
| ) |
|
|
| show_labels = kwargs.pop('show_labels', True) |
| if pipe and filename is not None: |
| raise ValueError('Can\'t specify both `filename` and `pipe`') |
| elif not pipe and filename is None: |
| filename = tempfile.mktemp() |
|
|
| nodes = get_stream_spec_nodes(stream_spec) |
|
|
| sorted_nodes, outgoing_edge_maps = topo_sort(nodes) |
| graph = graphviz.Digraph(format='png') |
| graph.attr(rankdir='LR') |
| if len(list(kwargs.keys())) != 0: |
| raise ValueError( |
| 'Invalid kwargs key(s): {}'.format(', '.join(list(kwargs.keys()))) |
| ) |
|
|
| for node in sorted_nodes: |
| color = _get_node_color(node) |
|
|
| if detail: |
| lines = [node.short_repr] |
| lines += ['{!r}'.format(arg) for arg in node.args] |
| lines += [ |
| '{}={!r}'.format(key, node.kwargs[key]) for key in sorted(node.kwargs) |
| ] |
| node_text = '\n'.join(lines) |
| else: |
| node_text = node.short_repr |
| graph.node( |
| str(hash(node)), node_text, shape='box', style='filled', fillcolor=color |
| ) |
| outgoing_edge_map = outgoing_edge_maps.get(node, {}) |
|
|
| for edge in get_outgoing_edges(node, outgoing_edge_map): |
| kwargs = {} |
| up_label = edge.upstream_label |
| down_label = edge.downstream_label |
| up_selector = edge.upstream_selector |
|
|
| if show_labels and ( |
| up_label is not None |
| or down_label is not None |
| or up_selector is not None |
| ): |
| if up_label is None: |
| up_label = '' |
| if up_selector is not None: |
| up_label += ":" + up_selector |
| if down_label is None: |
| down_label = '' |
| if up_label != '' and down_label != '': |
| middle = ' {} '.format(_RIGHT_ARROW) |
| else: |
| middle = '' |
| kwargs['label'] = '{} {} {}'.format(up_label, middle, down_label) |
| upstream_node_id = str(hash(edge.upstream_node)) |
| downstream_node_id = str(hash(edge.downstream_node)) |
| graph.edge(upstream_node_id, downstream_node_id, **kwargs) |
|
|
| if pipe: |
| return graph.pipe() |
| else: |
| graph.view(filename, cleanup=True) |
| return stream_spec |
|
|
|
|
| __all__ = ['view'] |
|
|
