mirror of
https://github.com/kkroening/ffmpeg-python.git
synced 2025-04-05 12:48:09 +08:00
295 lines
10 KiB
Python
295 lines
10 KiB
Python
from __future__ import unicode_literals
|
|
|
|
from .dag import KwargReprNode
|
|
from ._utils import escape_chars, get_hash_int
|
|
from builtins import object
|
|
import os
|
|
|
|
|
|
def _is_of_types(obj, types):
|
|
valid = False
|
|
for stream_type in types:
|
|
if isinstance(obj, stream_type):
|
|
valid = True
|
|
break
|
|
return valid
|
|
|
|
|
|
def _get_types_str(types):
|
|
return ', '.join(['{}.{}'.format(x.__module__, x.__name__) for x in types])
|
|
|
|
|
|
class Stream(object):
|
|
"""Represents the outgoing edge of an upstream node; may be used to create more downstream nodes."""
|
|
|
|
def __init__(self, upstream_node, upstream_label, node_types, upstream_selector=None):
|
|
if not _is_of_types(upstream_node, node_types):
|
|
raise TypeError('Expected upstream node to be of one of the following type(s): {}; got {}'.format(
|
|
_get_types_str(node_types), type(upstream_node)))
|
|
self.node = upstream_node
|
|
self.label = upstream_label
|
|
self.selector = upstream_selector
|
|
|
|
def __hash__(self):
|
|
return get_hash_int([hash(self.node), hash(self.label)])
|
|
|
|
def __eq__(self, other):
|
|
return hash(self) == hash(other)
|
|
|
|
def __repr__(self):
|
|
node_repr = self.node.long_repr(include_hash=False)
|
|
selector = ""
|
|
if self.selector:
|
|
selector = ":{}".format(self.selector)
|
|
out = '{}[{!r}{}] <{}>'.format(node_repr, self.label, selector, self.node.short_hash)
|
|
return out
|
|
|
|
def __getitem__(self, item):
|
|
"""
|
|
Select a component of the stream. `stream[:X]` is analogous to `stream.node.stream(select=X)`.
|
|
Please note that this can only be used to select a substream that already exist. If you want to split
|
|
the stream, use the `split` filter.
|
|
"""
|
|
if not isinstance(item, slice) or item.start is not None:
|
|
raise ValueError("Invalid syntax. Use 'stream[:\"something\"]', not 'stream[\"something\"]'.")
|
|
|
|
return self.node.stream(select=item.stop)
|
|
|
|
|
|
def get_stream_map(stream_spec):
|
|
if stream_spec is None:
|
|
stream_map = {}
|
|
elif isinstance(stream_spec, Stream):
|
|
stream_map = {None: stream_spec}
|
|
elif isinstance(stream_spec, (list, tuple)):
|
|
stream_map = dict(enumerate(stream_spec))
|
|
elif isinstance(stream_spec, dict):
|
|
stream_map = stream_spec
|
|
return stream_map
|
|
|
|
|
|
def get_stream_map_nodes(stream_map):
|
|
nodes = []
|
|
for stream in list(stream_map.values()):
|
|
if not isinstance(stream, Stream):
|
|
raise TypeError('Expected Stream; got {}'.format(type(stream)))
|
|
nodes.append(stream.node)
|
|
return nodes
|
|
|
|
|
|
def get_stream_spec_nodes(stream_spec):
|
|
stream_map = get_stream_map(stream_spec)
|
|
return get_stream_map_nodes(stream_map)
|
|
|
|
|
|
class Node(KwargReprNode):
|
|
"""Node base"""
|
|
|
|
@classmethod
|
|
def __check_input_len(cls, stream_map, min_inputs, max_inputs):
|
|
if min_inputs is not None and len(stream_map) < min_inputs:
|
|
raise ValueError('Expected at least {} input stream(s); got {}'.format(min_inputs, len(stream_map)))
|
|
elif max_inputs is not None and len(stream_map) > max_inputs:
|
|
raise ValueError('Expected at most {} input stream(s); got {}'.format(max_inputs, len(stream_map)))
|
|
|
|
@classmethod
|
|
def __check_input_types(cls, stream_map, incoming_stream_types):
|
|
for stream in list(stream_map.values()):
|
|
if not _is_of_types(stream, incoming_stream_types):
|
|
raise TypeError('Expected incoming stream(s) to be of one of the following types: {}; got {}'
|
|
.format(_get_types_str(incoming_stream_types), type(stream)))
|
|
|
|
@classmethod
|
|
def __get_incoming_edge_map(cls, stream_map):
|
|
incoming_edge_map = {}
|
|
for downstream_label, upstream in list(stream_map.items()):
|
|
incoming_edge_map[downstream_label] = (upstream.node, upstream.label, upstream.selector)
|
|
return incoming_edge_map
|
|
|
|
def __init__(self, stream_spec, name, incoming_stream_types, outgoing_stream_type, min_inputs, max_inputs, args=[],
|
|
kwargs={}):
|
|
stream_map = get_stream_map(stream_spec)
|
|
self.__check_input_len(stream_map, min_inputs, max_inputs)
|
|
self.__check_input_types(stream_map, incoming_stream_types)
|
|
incoming_edge_map = self.__get_incoming_edge_map(stream_map)
|
|
super(Node, self).__init__(incoming_edge_map, name, args, kwargs)
|
|
self.__outgoing_stream_type = outgoing_stream_type
|
|
|
|
self.__incoming_stream_types = incoming_stream_types
|
|
self.__min_inputs = min_inputs
|
|
self.__max_inputs = max_inputs
|
|
|
|
def stream(self, label=None, select=None):
|
|
"""Create an outgoing stream originating from this node.
|
|
|
|
More nodes may be attached onto the outgoing stream.
|
|
"""
|
|
return self.__outgoing_stream_type(self, label, upstream_selector=select)
|
|
|
|
def __getitem__(self, item):
|
|
"""Create an outgoing stream originating from this node; syntactic sugar for ``self.stream(label)``.
|
|
It can also be used to apply a selector: e.g. node[0:"audio"] returns a stream with label 0 and
|
|
selector "audio", which is the same as ``node.stream(label=0, select="audio")``.
|
|
"""
|
|
if isinstance(item, slice):
|
|
return self.stream(label=item.start, select=item.stop)
|
|
else:
|
|
return self.stream(label=item)
|
|
|
|
def _add_streams(self, stream_spec):
|
|
"""Attach additional streams after the Node is initialized.
|
|
"""
|
|
# Back up previous edges
|
|
prev_edges = self.incoming_edge_map.values()
|
|
|
|
# Check new edges
|
|
new_stream_map = get_stream_map(stream_spec)
|
|
self.__check_input_types(new_stream_map, self.__incoming_stream_types)
|
|
|
|
# Generate new edge map
|
|
new_inc_edge_map = self.__get_incoming_edge_map(new_stream_map)
|
|
new_edges = new_inc_edge_map.values()
|
|
|
|
# Rename all edges
|
|
new_edge_map = dict(enumerate(list(prev_edges) + list(new_edges)))
|
|
|
|
# Check new length
|
|
self.__check_input_len(new_edge_map, self.__min_inputs, self.__max_inputs)
|
|
|
|
# Overwrite old map (exploiting the fact that dict is mutable; incoming_edge_map is a read-only property)
|
|
if None in self.incoming_edge_map:
|
|
self.incoming_edge_map.pop(None)
|
|
self.incoming_edge_map.update(new_edge_map)
|
|
|
|
|
|
class FilterableStream(Stream):
|
|
def __init__(self, upstream_node, upstream_label, upstream_selector=None):
|
|
super(FilterableStream, self).__init__(upstream_node, upstream_label, {InputNode, FilterNode},
|
|
upstream_selector)
|
|
|
|
|
|
class InputNode(Node):
|
|
"""InputNode type"""
|
|
|
|
def __init__(self, name, args=[], kwargs={}):
|
|
super(InputNode, self).__init__(
|
|
stream_spec=None,
|
|
name=name,
|
|
incoming_stream_types={},
|
|
outgoing_stream_type=FilterableStream,
|
|
min_inputs=0,
|
|
max_inputs=0,
|
|
args=args,
|
|
kwargs=kwargs
|
|
)
|
|
|
|
@property
|
|
def short_repr(self):
|
|
return os.path.basename(self.kwargs['filename'])
|
|
|
|
|
|
class FilterNode(Node):
|
|
def __init__(self, stream_spec, name, max_inputs=1, args=[], kwargs={}):
|
|
super(FilterNode, self).__init__(
|
|
stream_spec=stream_spec,
|
|
name=name,
|
|
incoming_stream_types={FilterableStream},
|
|
outgoing_stream_type=FilterableStream,
|
|
min_inputs=1,
|
|
max_inputs=max_inputs,
|
|
args=args,
|
|
kwargs=kwargs
|
|
)
|
|
|
|
"""FilterNode"""
|
|
|
|
def _get_filter(self, outgoing_edges):
|
|
args = self.args
|
|
kwargs = self.kwargs
|
|
if self.name == 'split':
|
|
args = [len(outgoing_edges)]
|
|
|
|
out_args = [escape_chars(x, '\\\'=:') for x in args]
|
|
out_kwargs = {}
|
|
for k, v in list(kwargs.items()):
|
|
k = escape_chars(k, '\\\'=:')
|
|
v = escape_chars(v, '\\\'=:')
|
|
out_kwargs[k] = v
|
|
|
|
arg_params = [escape_chars(v, '\\\'=:') for v in out_args]
|
|
kwarg_params = ['{}={}'.format(k, out_kwargs[k]) for k in sorted(out_kwargs)]
|
|
params = arg_params + kwarg_params
|
|
|
|
params_text = escape_chars(self.name, '\\\'=:')
|
|
|
|
if params:
|
|
params_text += '={}'.format(':'.join(params))
|
|
return escape_chars(params_text, '\\\'[],;')
|
|
|
|
|
|
class OutputNode(Node):
|
|
def __init__(self, stream, name, args=[], kwargs={}):
|
|
super(OutputNode, self).__init__(
|
|
stream_spec=stream,
|
|
name=name,
|
|
incoming_stream_types={FilterableStream},
|
|
outgoing_stream_type=OutputStream,
|
|
min_inputs=0, # Allow streams to be mapped afterwards
|
|
max_inputs=None,
|
|
args=args,
|
|
kwargs=kwargs
|
|
)
|
|
|
|
@property
|
|
def short_repr(self):
|
|
return os.path.basename(self.kwargs['filename'])
|
|
|
|
|
|
class OutputStream(Stream):
|
|
def __init__(self, upstream_node, upstream_label, upstream_selector=None):
|
|
super(OutputStream, self).__init__(upstream_node, upstream_label, {OutputNode, GlobalNode, MergeOutputsNode},
|
|
upstream_selector=upstream_selector)
|
|
|
|
|
|
class MergeOutputsNode(Node):
|
|
def __init__(self, streams, name):
|
|
super(MergeOutputsNode, self).__init__(
|
|
stream_spec=streams,
|
|
name=name,
|
|
incoming_stream_types={OutputStream},
|
|
outgoing_stream_type=OutputStream,
|
|
min_inputs=1,
|
|
max_inputs=None
|
|
)
|
|
|
|
|
|
class GlobalNode(Node):
|
|
def __init__(self, stream, name, args=[], kwargs={}):
|
|
super(GlobalNode, self).__init__(
|
|
stream_spec=stream,
|
|
name=name,
|
|
incoming_stream_types={OutputStream},
|
|
outgoing_stream_type=OutputStream,
|
|
min_inputs=1,
|
|
max_inputs=1,
|
|
args=args,
|
|
kwargs=kwargs
|
|
)
|
|
|
|
|
|
def stream_operator(stream_classes={Stream}, name=None):
|
|
def decorator(func):
|
|
func_name = name or func.__name__
|
|
[setattr(stream_class, func_name, func) for stream_class in stream_classes]
|
|
return func
|
|
|
|
return decorator
|
|
|
|
|
|
def filter_operator(name=None):
|
|
return stream_operator(stream_classes={FilterableStream}, name=name)
|
|
|
|
|
|
def output_operator(name=None):
|
|
return stream_operator(stream_classes={OutputStream}, name=name)
|