mirror of https://github.com/morpheus65535/bazarr
378 lines
12 KiB
Python
378 lines
12 KiB
Python
from __future__ import unicode_literals
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from past.builtins import basestring
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from .dag import KwargReprNode
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from ._utils import escape_chars, get_hash_int
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from builtins import object
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import os
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def _is_of_types(obj, types):
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valid = False
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for stream_type in types:
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if isinstance(obj, stream_type):
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valid = True
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break
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return valid
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def _get_types_str(types):
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return ', '.join(['{}.{}'.format(x.__module__, x.__name__) for x in types])
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class Stream(object):
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"""Represents the outgoing edge of an upstream node; may be used to create more downstream nodes."""
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def __init__(
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self, upstream_node, upstream_label, node_types, upstream_selector=None
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):
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if not _is_of_types(upstream_node, node_types):
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raise TypeError(
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'Expected upstream node to be of one of the following type(s): {}; got {}'.format(
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_get_types_str(node_types), type(upstream_node)
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)
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)
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self.node = upstream_node
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self.label = upstream_label
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self.selector = upstream_selector
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def __hash__(self):
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return get_hash_int([hash(self.node), hash(self.label)])
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def __eq__(self, other):
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return hash(self) == hash(other)
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def __repr__(self):
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node_repr = self.node.long_repr(include_hash=False)
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selector = ''
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if self.selector:
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selector = ':{}'.format(self.selector)
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out = '{}[{!r}{}] <{}>'.format(
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node_repr, self.label, selector, self.node.short_hash
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)
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return out
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def __getitem__(self, index):
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"""
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Select a component (audio, video) of the stream.
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Example:
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Process the audio and video portions of a stream independently::
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input = ffmpeg.input('in.mp4')
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audio = input['a'].filter("aecho", 0.8, 0.9, 1000, 0.3)
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video = input['v'].hflip()
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out = ffmpeg.output(audio, video, 'out.mp4')
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"""
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if self.selector is not None:
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raise ValueError('Stream already has a selector: {}'.format(self))
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elif not isinstance(index, basestring):
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raise TypeError("Expected string index (e.g. 'a'); got {!r}".format(index))
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return self.node.stream(label=self.label, selector=index)
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@property
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def audio(self):
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"""Select the audio-portion of a stream.
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Some ffmpeg filters drop audio streams, and care must be taken
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to preserve the audio in the final output. The ``.audio`` and
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``.video`` operators can be used to reference the audio/video
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portions of a stream so that they can be processed separately
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and then re-combined later in the pipeline. This dilemma is
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intrinsic to ffmpeg, and ffmpeg-python tries to stay out of the
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way while users may refer to the official ffmpeg documentation
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as to why certain filters drop audio.
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``stream.audio`` is a shorthand for ``stream['a']``.
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Example:
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Process the audio and video portions of a stream independently::
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input = ffmpeg.input('in.mp4')
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audio = input.audio.filter("aecho", 0.8, 0.9, 1000, 0.3)
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video = input.video.hflip()
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out = ffmpeg.output(audio, video, 'out.mp4')
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"""
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return self['a']
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@property
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def video(self):
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"""Select the video-portion of a stream.
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Some ffmpeg filters drop audio streams, and care must be taken
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to preserve the audio in the final output. The ``.audio`` and
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``.video`` operators can be used to reference the audio/video
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portions of a stream so that they can be processed separately
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and then re-combined later in the pipeline. This dilemma is
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intrinsic to ffmpeg, and ffmpeg-python tries to stay out of the
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way while users may refer to the official ffmpeg documentation
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as to why certain filters drop audio.
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``stream.video`` is a shorthand for ``stream['v']``.
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Example:
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Process the audio and video portions of a stream independently::
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input = ffmpeg.input('in.mp4')
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audio = input.audio.filter("aecho", 0.8, 0.9, 1000, 0.3)
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video = input.video.hflip()
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out = ffmpeg.output(audio, video, 'out.mp4')
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"""
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return self['v']
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def get_stream_map(stream_spec):
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if stream_spec is None:
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stream_map = {}
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elif isinstance(stream_spec, Stream):
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stream_map = {None: stream_spec}
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elif isinstance(stream_spec, (list, tuple)):
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stream_map = dict(enumerate(stream_spec))
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elif isinstance(stream_spec, dict):
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stream_map = stream_spec
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return stream_map
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def get_stream_map_nodes(stream_map):
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nodes = []
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for stream in list(stream_map.values()):
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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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return nodes
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def get_stream_spec_nodes(stream_spec):
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stream_map = get_stream_map(stream_spec)
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return get_stream_map_nodes(stream_map)
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class Node(KwargReprNode):
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"""Node base"""
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@classmethod
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def __check_input_len(cls, stream_map, min_inputs, max_inputs):
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if min_inputs is not None and len(stream_map) < min_inputs:
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raise ValueError(
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'Expected at least {} input stream(s); got {}'.format(
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min_inputs, len(stream_map)
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)
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)
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elif max_inputs is not None and len(stream_map) > max_inputs:
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raise ValueError(
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'Expected at most {} input stream(s); got {}'.format(
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max_inputs, len(stream_map)
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)
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)
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@classmethod
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def __check_input_types(cls, stream_map, incoming_stream_types):
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for stream in list(stream_map.values()):
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if not _is_of_types(stream, incoming_stream_types):
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raise TypeError(
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'Expected incoming stream(s) to be of one of the following types: {}; got {}'.format(
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_get_types_str(incoming_stream_types), type(stream)
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)
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)
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@classmethod
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def __get_incoming_edge_map(cls, stream_map):
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incoming_edge_map = {}
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for downstream_label, upstream in list(stream_map.items()):
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incoming_edge_map[downstream_label] = (
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upstream.node,
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upstream.label,
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upstream.selector,
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)
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return incoming_edge_map
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def __init__(
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self,
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stream_spec,
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name,
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incoming_stream_types,
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outgoing_stream_type,
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min_inputs,
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max_inputs,
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args=[],
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kwargs={},
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):
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stream_map = get_stream_map(stream_spec)
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self.__check_input_len(stream_map, min_inputs, max_inputs)
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self.__check_input_types(stream_map, incoming_stream_types)
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incoming_edge_map = self.__get_incoming_edge_map(stream_map)
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super(Node, self).__init__(incoming_edge_map, name, args, kwargs)
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self.__outgoing_stream_type = outgoing_stream_type
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self.__incoming_stream_types = incoming_stream_types
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def stream(self, label=None, selector=None):
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"""Create an outgoing stream originating from this node.
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More nodes may be attached onto the outgoing stream.
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"""
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return self.__outgoing_stream_type(self, label, upstream_selector=selector)
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def __getitem__(self, item):
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"""Create an outgoing stream originating from this node; syntactic sugar for ``self.stream(label)``.
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It can also be used to apply a selector: e.g. ``node[0:'a']`` returns a stream with label 0 and
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selector ``'a'``, which is the same as ``node.stream(label=0, selector='a')``.
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Example:
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Process the audio and video portions of a stream independently::
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input = ffmpeg.input('in.mp4')
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audio = input[:'a'].filter("aecho", 0.8, 0.9, 1000, 0.3)
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video = input[:'v'].hflip()
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out = ffmpeg.output(audio, video, 'out.mp4')
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"""
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if isinstance(item, slice):
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return self.stream(label=item.start, selector=item.stop)
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else:
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return self.stream(label=item)
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class FilterableStream(Stream):
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def __init__(self, upstream_node, upstream_label, upstream_selector=None):
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super(FilterableStream, self).__init__(
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upstream_node, upstream_label, {InputNode, FilterNode}, upstream_selector
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)
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# noinspection PyMethodOverriding
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class InputNode(Node):
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"""InputNode type"""
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def __init__(self, name, args=[], kwargs={}):
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super(InputNode, self).__init__(
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stream_spec=None,
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name=name,
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incoming_stream_types={},
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outgoing_stream_type=FilterableStream,
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min_inputs=0,
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max_inputs=0,
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args=args,
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kwargs=kwargs,
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)
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@property
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def short_repr(self):
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return os.path.basename(self.kwargs['filename'])
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# noinspection PyMethodOverriding
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class FilterNode(Node):
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def __init__(self, stream_spec, name, max_inputs=1, args=[], kwargs={}):
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super(FilterNode, self).__init__(
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stream_spec=stream_spec,
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name=name,
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incoming_stream_types={FilterableStream},
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outgoing_stream_type=FilterableStream,
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min_inputs=1,
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max_inputs=max_inputs,
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args=args,
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kwargs=kwargs,
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)
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"""FilterNode"""
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def _get_filter(self, outgoing_edges):
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args = self.args
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kwargs = self.kwargs
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if self.name in ('split', 'asplit'):
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args = [len(outgoing_edges)]
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out_args = [escape_chars(x, '\\\'=:') for x in args]
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out_kwargs = {}
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for k, v in list(kwargs.items()):
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k = escape_chars(k, '\\\'=:')
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v = escape_chars(v, '\\\'=:')
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out_kwargs[k] = v
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arg_params = [escape_chars(v, '\\\'=:') for v in out_args]
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kwarg_params = ['{}={}'.format(k, out_kwargs[k]) for k in sorted(out_kwargs)]
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params = arg_params + kwarg_params
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params_text = escape_chars(self.name, '\\\'=:')
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if params:
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params_text += '={}'.format(':'.join(params))
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return escape_chars(params_text, '\\\'[],;')
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# noinspection PyMethodOverriding
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class OutputNode(Node):
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def __init__(self, stream, name, args=[], kwargs={}):
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super(OutputNode, self).__init__(
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stream_spec=stream,
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name=name,
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incoming_stream_types={FilterableStream},
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outgoing_stream_type=OutputStream,
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min_inputs=1,
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max_inputs=None,
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args=args,
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kwargs=kwargs,
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)
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@property
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def short_repr(self):
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return os.path.basename(self.kwargs['filename'])
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class OutputStream(Stream):
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def __init__(self, upstream_node, upstream_label, upstream_selector=None):
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super(OutputStream, self).__init__(
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upstream_node,
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upstream_label,
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{OutputNode, GlobalNode, MergeOutputsNode},
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upstream_selector=upstream_selector,
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)
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# noinspection PyMethodOverriding
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class MergeOutputsNode(Node):
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def __init__(self, streams, name):
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super(MergeOutputsNode, self).__init__(
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stream_spec=streams,
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name=name,
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incoming_stream_types={OutputStream},
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outgoing_stream_type=OutputStream,
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min_inputs=1,
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max_inputs=None,
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)
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# noinspection PyMethodOverriding
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class GlobalNode(Node):
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def __init__(self, stream, name, args=[], kwargs={}):
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super(GlobalNode, self).__init__(
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stream_spec=stream,
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name=name,
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incoming_stream_types={OutputStream},
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outgoing_stream_type=OutputStream,
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min_inputs=1,
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max_inputs=1,
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args=args,
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kwargs=kwargs,
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)
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def stream_operator(stream_classes={Stream}, name=None):
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def decorator(func):
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func_name = name or func.__name__
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[setattr(stream_class, func_name, func) for stream_class in stream_classes]
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return func
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return decorator
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def filter_operator(name=None):
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return stream_operator(stream_classes={FilterableStream}, name=name)
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def output_operator(name=None):
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return stream_operator(stream_classes={OutputStream}, name=name)
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__all__ = ['Stream']
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