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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstParse: GStreamer 1.0 Core Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer 1.0 Core Reference Manual">
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<link rel="up" href="libgstreamer.html" title="GStreamer Core Library">
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<link rel="prev" href="gstreamer-GstParamSpec.html" title="GstParamSpec">
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<link rel="next" href="GstPipeline.html" title="GstPipeline">
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<meta name="generator" content="GTK-Doc V1.27 (XML mode)">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description |
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Object Hierarchy
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GstParse
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GstParse — Get a pipeline from a text pipeline description
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Functions
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GQuark
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gst_parse_error_quark ()
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GstElement *
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gst_parse_launch ()
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GstElement *
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gst_parse_launch_full ()
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GstElement *
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gst_parse_launchv ()
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GstElement *
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gst_parse_launchv_full ()
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GstElement *
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gst_parse_bin_from_description ()
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GstElement *
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gst_parse_bin_from_description_full ()
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GstParseContext *
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gst_parse_context_new ()
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GstParseContext *
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gst_parse_context_copy ()
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void
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gst_parse_context_free ()
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gchar **
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gst_parse_context_get_missing_elements ()
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Types and Values
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#define
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GST_PARSE_ERROR
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enum
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GstParseError
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GstParseContext
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enum
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GstParseFlags
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Object Hierarchy
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GBoxed
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╰── GstParseContext
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Includes
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#include <gst/gst.h>
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Description
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These function allow to create a pipeline based on the syntax used in the
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gst-launch-1.0 utility (see man-page for syntax documentation).
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Please note that these functions take several measures to create
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somewhat dynamic pipelines. Due to that such pipelines are not always
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reusable (set the state to NULL and back to PLAYING).
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Functions
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gst_parse_error_quark ()
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GQuark
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gst_parse_error_quark (void);
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Get the error quark used by the parsing subsystem.
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Returns
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the quark of the parse errors.
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gst_parse_launch ()
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GstElement *
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gst_parse_launch (const gchar *pipeline_description,
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GError **error);
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Create a new pipeline based on command line syntax.
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Please note that you might get a return value that is not NULL even though
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the error
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can try to play the pipeline.
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Parameters
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pipeline_description
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the command line describing the pipeline
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error
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the error message in case of an erroneous pipeline.
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Returns
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a new element on success, NULL on
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failure. If more than one toplevel element is specified by the
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pipeline_description
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, all elements are put into a GstPipeline, which
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than is returned.
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[transfer floating][nullable]
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gst_parse_launch_full ()
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GstElement *
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gst_parse_launch_full (const gchar *pipeline_description,
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GstParseContext *context,
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GstParseFlags flags,
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GError **error);
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Create a new pipeline based on command line syntax.
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the error
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Parameters
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pipeline_description
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the command line describing the pipeline
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context
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a parse context allocated with
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gst_parse_context_new(), or NULL.
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[allow-none]
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flags
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parsing options, or GST_PARSE_FLAG_NONE
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error
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the error message in case of an erroneous pipeline.
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Returns
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a new element on success, NULL on
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failure. If more than one toplevel element is specified by the
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pipeline_description
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then is returned (unless the GST_PARSE_FLAG_PLACE_IN_BIN flag is set, in
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which case they are put in a GstBin instead).
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[transfer floating][nullable]
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gst_parse_launchv ()
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GstElement *
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gst_parse_launchv (const gchar **argv,
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GError **error);
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Create a new element based on command line syntax.
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error
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will contain an error message if an erroneous pipeline is specified.
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An error does not mean that the pipeline could not be constructed.
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Parameters
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argv
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null-terminated array of arguments.
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[in][array zero-terminated=1]
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error
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pointer to a GError
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Returns
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a new element on success and NULL
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on failure.
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[transfer floating][nullable]
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gst_parse_launchv_full ()
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GstElement *
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gst_parse_launchv_full (const gchar **argv,
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GstParseContext *context,
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GstParseFlags flags,
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GError **error);
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Create a new element based on command line syntax.
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error
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will contain an error message if an erroneous pipeline is specified.
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An error does not mean that the pipeline could not be constructed.
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Parameters
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argv
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null-terminated array of arguments.
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[in][array zero-terminated=1]
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context
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a parse context allocated with
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gst_parse_context_new(), or NULL.
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[allow-none]
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flags
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parsing options, or GST_PARSE_FLAG_NONE
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error
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pointer to a GError (which must be initialised to NULL)
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
a new element on success; on
|
|
Packit |
f546b1 |
failure, either NULL or a partially-constructed bin or element will be
|
|
Packit |
f546b1 |
returned and error
|
|
Packit |
f546b1 |
will be set (unless you passed
|
|
Packit |
f546b1 |
GST_PARSE_FLAG_FATAL_ERRORS in flags
|
|
Packit |
f546b1 |
, then NULL will always be returned
|
|
Packit |
f546b1 |
on failure).
|
|
Packit |
f546b1 |
[transfer floating][nullable]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_parse_bin_from_description ()
|
|
Packit |
f546b1 |
GstElement *
|
|
Packit |
f546b1 |
gst_parse_bin_from_description (const gchar *bin_description,
|
|
Packit |
f546b1 |
gboolean ghost_unlinked_pads,
|
|
Packit |
f546b1 |
GError **err);
|
|
Packit |
f546b1 |
This is a convenience wrapper around gst_parse_launch() to create a
|
|
Packit |
f546b1 |
GstBin from a gst-launch-style pipeline description. See
|
|
Packit |
f546b1 |
gst_parse_launch() and the gst-launch man page for details about the
|
|
Packit |
f546b1 |
syntax. Ghost pads on the bin for unlinked source or sink pads
|
|
Packit |
f546b1 |
within the bin can automatically be created (but only a maximum of
|
|
Packit |
f546b1 |
one ghost pad for each direction will be created; if you expect
|
|
Packit |
f546b1 |
multiple unlinked source pads or multiple unlinked sink pads
|
|
Packit |
f546b1 |
and want them all ghosted, you will have to create the ghost pads
|
|
Packit |
f546b1 |
yourself).
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
bin_description
|
|
Packit |
f546b1 |
command line describing the bin
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
ghost_unlinked_pads
|
|
Packit |
f546b1 |
whether to automatically create ghost pads
|
|
Packit |
f546b1 |
for unlinked source or sink pads within the bin
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
err
|
|
Packit |
f546b1 |
where to store the error message in case of an error, or NULL
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
a
|
|
Packit |
f546b1 |
newly-created bin, or NULL if an error occurred.
|
|
Packit |
f546b1 |
[transfer floating][type Gst.Bin][nullable]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_parse_bin_from_description_full ()
|
|
Packit |
f546b1 |
GstElement *
|
|
Packit |
f546b1 |
gst_parse_bin_from_description_full (const gchar *bin_description,
|
|
Packit |
f546b1 |
gboolean ghost_unlinked_pads,
|
|
Packit |
f546b1 |
GstParseContext *context,
|
|
Packit |
f546b1 |
GstParseFlags flags,
|
|
Packit |
f546b1 |
GError **err);
|
|
Packit |
f546b1 |
This is a convenience wrapper around gst_parse_launch() to create a
|
|
Packit |
f546b1 |
GstBin from a gst-launch-style pipeline description. See
|
|
Packit |
f546b1 |
gst_parse_launch() and the gst-launch man page for details about the
|
|
Packit |
f546b1 |
syntax. Ghost pads on the bin for unlinked source or sink pads
|
|
Packit |
f546b1 |
within the bin can automatically be created (but only a maximum of
|
|
Packit |
f546b1 |
one ghost pad for each direction will be created; if you expect
|
|
Packit |
f546b1 |
multiple unlinked source pads or multiple unlinked sink pads
|
|
Packit |
f546b1 |
and want them all ghosted, you will have to create the ghost pads
|
|
Packit |
f546b1 |
yourself).
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
bin_description
|
|
Packit |
f546b1 |
command line describing the bin
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
ghost_unlinked_pads
|
|
Packit |
f546b1 |
whether to automatically create ghost pads
|
|
Packit |
f546b1 |
for unlinked source or sink pads within the bin
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
context
|
|
Packit |
f546b1 |
a parse context allocated with
|
|
Packit |
f546b1 |
gst_parse_context_new(), or NULL.
|
|
Packit |
f546b1 |
[transfer none][allow-none]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
flags
|
|
Packit |
f546b1 |
parsing options, or GST_PARSE_FLAG_NONE
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
err
|
|
Packit |
f546b1 |
where to store the error message in case of an error, or NULL
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
a newly-created
|
|
Packit |
f546b1 |
element, which is guaranteed to be a bin unless
|
|
Packit |
f546b1 |
GST_FLAG_NO_SINGLE_ELEMENT_BINS was passed, or NULL if an error
|
|
Packit |
f546b1 |
occurred.
|
|
Packit |
f546b1 |
[transfer floating][type Gst.Element][nullable]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_parse_context_new ()
|
|
Packit |
f546b1 |
GstParseContext *
|
|
Packit |
f546b1 |
gst_parse_context_new (void);
|
|
Packit |
f546b1 |
Allocates a parse context for use with gst_parse_launch_full() or
|
|
Packit |
f546b1 |
gst_parse_launchv_full().
|
|
Packit |
f546b1 |
Free-function: gst_parse_context_free
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
a newly-allocated parse context. Free
|
|
Packit |
f546b1 |
with gst_parse_context_free() when no longer needed.
|
|
Packit |
f546b1 |
[transfer full][nullable]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_parse_context_copy ()
|
|
Packit |
f546b1 |
GstParseContext *
|
|
Packit |
f546b1 |
gst_parse_context_copy (const GstParseContext *context);
|
|
Packit |
f546b1 |
Copies the context
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
context
|
|
Packit |
f546b1 |
a GstParseContext
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
A copied GstParseContext.
|
|
Packit |
f546b1 |
[transfer full][nullable]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_parse_context_free ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_parse_context_free (GstParseContext *context);
|
|
Packit |
f546b1 |
Frees a parse context previously allocated with gst_parse_context_new().
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
context
|
|
Packit |
f546b1 |
a GstParseContext.
|
|
Packit |
f546b1 |
[transfer full]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_parse_context_get_missing_elements ()
|
|
Packit |
f546b1 |
gchar **
|
|
Packit |
f546b1 |
gst_parse_context_get_missing_elements
|
|
Packit |
f546b1 |
(GstParseContext *context);
|
|
Packit |
f546b1 |
Retrieve missing elements from a previous run of gst_parse_launch_full()
|
|
Packit |
f546b1 |
or gst_parse_launchv_full(). Will only return results if an error code
|
|
Packit |
f546b1 |
of GST_PARSE_ERROR_NO_SUCH_ELEMENT was returned.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
context
|
|
Packit |
f546b1 |
a GstParseContext
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
a
|
|
Packit |
f546b1 |
NULL-terminated array of element factory name strings of missing
|
|
Packit |
f546b1 |
elements. Free with g_strfreev() when no longer needed.
|
|
Packit |
f546b1 |
[transfer full][array zero-terminated=1][element-type gchar*][nullable]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Types and Values
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR
|
|
Packit |
f546b1 |
#define GST_PARSE_ERROR gst_parse_error_quark ()
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Get access to the error quark of the parse subsystem.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
enum GstParseError
|
|
Packit |
f546b1 |
The different parsing errors that can occur.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Members
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_SYNTAX
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
A syntax error occurred.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_NO_SUCH_ELEMENT
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
The description contained an unknown element
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_NO_SUCH_PROPERTY
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
An element did not have a specified property
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_LINK
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
There was an error linking two pads.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
There was an error setting a property
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_EMPTY_BIN
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
An empty bin was specified.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_EMPTY
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
An empty description was specified
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_ERROR_DELAYED_LINK
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
A delayed link did not get resolved.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GstParseContext
|
|
Packit |
f546b1 |
typedef struct _GstParseContext GstParseContext;
|
|
Packit |
f546b1 |
Opaque structure.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
enum GstParseFlags
|
|
Packit |
f546b1 |
Parsing options.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Members
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_FLAG_NONE
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Do not use any special parsing options.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_FLAG_FATAL_ERRORS
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Always return NULL when an error occurs
|
|
Packit |
f546b1 |
(default behaviour is to return partially constructed bins or elements
|
|
Packit |
f546b1 |
in some cases)
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
If a bin only has a single element,
|
|
Packit |
f546b1 |
just return the element.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GST_PARSE_FLAG_PLACE_IN_BIN
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
If more than one toplevel element is described
|
|
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GstPipeline. (Since 1.10)
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</html>
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