Enum ParseError 

pub enum ParseError {
    Empty,
    EmptyStage,
    TooFewStages,
    UnknownSource(String),
    UnknownElement(String),
    MalformedProperty {
        element: String,
        token: String,
    },
    UnknownProperty {
        element: String,
        key: String,
    },
    BadValue {
        element: String,
        key: String,
        value: String,
    },
    BadEnumValue {
        element: String,
        key: String,
        value: String,
        values: &'static str,
    },
    UnknownReference(String),
    DuplicateName(String),
    NotAMuxer(String),
    MuxerWithoutOutput(String),
    UnknownInputPad(String),
    DuplicateInputPad(String),
    QueueRole(String),
    DecodebinNoUpstream,
    NoDecodeChain(String),
    EncodingProfile(String),
    NoEncoder(String),
    EncodebinInput(String),
    UriSourceNotAtHead(String),
    MissingUri(String),
    Uri(String),
    Graph(GraphError),
}

Why parse_launch could not build a graph.

Variants

Empty

The pipeline string was empty or all whitespace.

EmptyStage

A node between ! separators had no element name.

TooFewStages

Fewer than two elements: a runnable pipeline needs at least a source and a sink.

UnknownSource(String)

A source-position element names no registered source.

UnknownElement(String)

A transform / sink-position element names no registered element.

MalformedProperty

A property token had no = (expected key=value).

Fields

element: String

token: String

UnknownProperty

The element has no property of that name.

Fields

element: String

key: String

BadValue

The value did not parse for the property’s kind, or was rejected.

Fields

element: String

key: String

value: String

BadEnumValue

The value names no declared choice of an enum / flag property. value is the offending nick (one entry of a +-joined set), or the whole value when the set was malformed; values is the property’s declared list.

Fields

element: String

key: String

value: String

values: &'static str

UnknownReference(String)

A name. reference names no element declared with that name=.

DuplicateName(String)

Two elements share the same name= handle.

NotAMuxer(String)

More than one link feeds an element’s input, but it names no registered muxer: fan-in needs a MuxerFactory.

MuxerWithoutOutput(String)

A muxer (an element with several inputs) has no outgoing link; its single output pad must feed a downstream consumer.

UnknownInputPad(String)

A named input-pad reference (mux.foo_0) names a request pad this muxer does not define (M481): the element’s input_pad_index scheme declined it.

DuplicateInputPad(String)

Two input-pad references resolve to the same muxer input index (M481), e.g. mux.video_0 named twice, or a named pad colliding with a positional one.

QueueRole(String)

A queue / queue2 sits anywhere but a 1-in/1-out position. It is not an element in g2g (it collapses into the edge’s backpressure policy), so it cannot be a source, a sink, or a fan-out / fan-in node.

DecodebinNoUpstream

A decodebin has no upstream element to take its input caps from (it was the first element, or followed a bare name. reference). decodebin auto-plugs from its predecessor’s declared caps, so it needs one.

NoDecodeChain(String)

decodebin found no chain of registered decoders / parsers from its input caps to raw video or audio (the input caps are quoted). Either no decoder feature is compiled in, or the input is a container that needs a demuxer (auto-plugging through fan-out demuxers is not yet supported).

EncodingProfile(String)

An encodebin had no profile=, or one that is not container-caps:stream-caps[:stream-caps...] (the message says which).

NoEncoder(String)

An encodebin profile named a container no registered muxer writes, or a stream codec no compiled-in encoder produces (the message quotes it).

EncodebinInput(String)

An encodebin chain’s input is not raw video or audio, or its profile has no stream of that kind, so nothing in the profile can encode it.

UriSourceNotAtHead(String)

A uridecodebin / playbin was not at the head of its chain. It provides the source, so it must start the pipeline.

MissingUri(String)

A uridecodebin / playbin had no uri= property.

Uri(String)

The uri= could not be turned into a source (bad URI, or no handler registered for its scheme). The message quotes the URI and reason.

Graph(GraphError)

Linking two nodes into the graph failed.

Trait Implementations

impl Clone for ParseError

fn clone(&self) -> ParseError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ParseError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ParseError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ParseError

impl From<GraphError> for ParseError

fn from(e: GraphError) -> Self

Converts to this type from the input type.

impl PartialEq for ParseError

fn eq(&self, other: &ParseError) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ParseError