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GstTag-1.0.gir
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GstTag-1.0.gir
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<?xml version="1.0"?>
<!-- This file was automatically generated from C sources - DO NOT EDIT!
To affect the contents of this file, edit the original C definitions,
and/or use gtk-doc annotations. -->
<repository xmlns="http://www.gtk.org/introspection/core/1.0" xmlns:c="http://www.gtk.org/introspection/c/1.0" xmlns:glib="http://www.gtk.org/introspection/glib/1.0" version="1.2">
<include name="Gst" version="1.0"/>
<include name="GstBase" version="1.0"/>
<package name="gstreamer-tag-1.0"/>
<c:include name="gst/tag/tag.h"/>
<namespace name="GstTag" version="1.0" shared-library="libgsttag-1.0.so.0" c:identifier-prefixes="Gst" c:symbol-prefixes="gst">
<function-macro name="IS_TAG_DEMUX" c:identifier="GST_IS_TAG_DEMUX" introspectable="0">
<parameters>
<parameter name="obj">
</parameter>
</parameters>
</function-macro>
<function-macro name="IS_TAG_DEMUX_CLASS" c:identifier="GST_IS_TAG_DEMUX_CLASS" introspectable="0">
<parameters>
<parameter name="klass">
</parameter>
</parameters>
</function-macro>
<function-macro name="IS_TAG_MUX" c:identifier="GST_IS_TAG_MUX" introspectable="0">
<parameters>
<parameter name="obj">
</parameter>
</parameters>
</function-macro>
<function-macro name="IS_TAG_MUX_CLASS" c:identifier="GST_IS_TAG_MUX_CLASS" introspectable="0">
<parameters>
<parameter name="klass">
</parameter>
</parameters>
</function-macro>
<function-macro name="IS_TAG_XMP_WRITER" c:identifier="GST_IS_TAG_XMP_WRITER" introspectable="0">
<parameters>
<parameter name="obj">
</parameter>
</parameters>
</function-macro>
<constant name="TAG_ACOUSTID_FINGERPRINT" value="chromaprint-fingerprint" c:type="GST_TAG_ACOUSTID_FINGERPRINT" version="1.18">
<doc xml:space="preserve">AcoustID Fingerprint (Chromaprint)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_ACOUSTID_ID" value="acoustid-id" c:type="GST_TAG_ACOUSTID_ID" version="1.18">
<doc xml:space="preserve">AcoustID Identifier</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_CONTRAST" value="capturing-contrast" c:type="GST_TAG_CAPTURING_CONTRAST">
<doc xml:space="preserve">Direction of contrast processing applied when capturing an image. (string)
The allowed values are:
"normal"
"soft"
"hard"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_DIGITAL_ZOOM_RATIO" value="capturing-digital-zoom-ratio" c:type="GST_TAG_CAPTURING_DIGITAL_ZOOM_RATIO">
<doc xml:space="preserve">Digital zoom ratio used when capturing an image. (double)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_EXPOSURE_COMPENSATION" value="capturing-exposure-compensation" c:type="GST_TAG_CAPTURING_EXPOSURE_COMPENSATION">
<doc xml:space="preserve">Exposure compensation using when capturing an image in EV. (double)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_EXPOSURE_MODE" value="capturing-exposure-mode" c:type="GST_TAG_CAPTURING_EXPOSURE_MODE">
<doc xml:space="preserve">Exposure mode used when capturing an image. (string)
The allowed values are:
"auto-exposure"
"manual-exposure"
"auto-bracket"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_EXPOSURE_PROGRAM" value="capturing-exposure-program" c:type="GST_TAG_CAPTURING_EXPOSURE_PROGRAM">
<doc xml:space="preserve">Type of exposure control used when capturing an image. (string)
The allowed values are:
"undefined"
"manual"
"normal" - automatically controlled
"aperture-priority" - user selects aperture value
"shutter-priority" - user selects shutter speed
"creative" - biased towards depth of field
"action" - biased towards fast shutter speed
"portrait" - closeup, leaving background out of focus
"landscape" - landscape photos, background in focus</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_FLASH_FIRED" value="capturing-flash-fired" c:type="GST_TAG_CAPTURING_FLASH_FIRED">
<doc xml:space="preserve">If flash was fired during the capture of an image. (boolean)
Note that if this tag isn't present, it should not be assumed that
the flash did not fire. It should be treated as unknown.</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_FLASH_MODE" value="capturing-flash-mode" c:type="GST_TAG_CAPTURING_FLASH_MODE">
<doc xml:space="preserve">The flash mode selected during the capture of an image. (string)
The allowed values are:
"auto"
"always"
"never"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_FOCAL_LENGTH" value="capturing-focal-length" c:type="GST_TAG_CAPTURING_FOCAL_LENGTH">
<doc xml:space="preserve">Focal length used when capturing an image, in mm. (double)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_FOCAL_LENGTH_35_MM" value="capturing-focal-length-35mm" c:type="GST_TAG_CAPTURING_FOCAL_LENGTH_35_MM" version="1.10">
<doc xml:space="preserve">35 mm equivalent focal length used when capturing an image, in mm. (double)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_FOCAL_RATIO" value="capturing-focal-ratio" c:type="GST_TAG_CAPTURING_FOCAL_RATIO">
<doc xml:space="preserve">Focal ratio (f-number) used when capturing an image. (double)
The value stored is the denominator of the focal ratio (f-number).
For example, if this tag value is 2, the focal ratio is f/2.</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_GAIN_ADJUSTMENT" value="capturing-gain-adjustment" c:type="GST_TAG_CAPTURING_GAIN_ADJUSTMENT">
<doc xml:space="preserve">Gain adjustment applied to an image. (string)
The allowed values are:
"none"
"low-gain-up"
"high-gain-up"
"low-gain-down"
"high-gain-down"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_ISO_SPEED" value="capturing-iso-speed" c:type="GST_TAG_CAPTURING_ISO_SPEED">
<doc xml:space="preserve">ISO speed used when capturing an image. (integer)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_METERING_MODE" value="capturing-metering-mode" c:type="GST_TAG_CAPTURING_METERING_MODE">
<doc xml:space="preserve">Defines the way a camera determines the exposure. (string)
The allowed values are:
"unknown"
"average"
"center-weighted-average"
"spot"
"multi-spot"
"pattern"
"partial"
"other"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_SATURATION" value="capturing-saturation" c:type="GST_TAG_CAPTURING_SATURATION">
<doc xml:space="preserve">Direction of saturation processing applied when capturing an image. (string)
The allowed values are:
"normal"
"low-saturation"
"high-saturation"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_SCENE_CAPTURE_TYPE" value="capturing-scene-capture-type" c:type="GST_TAG_CAPTURING_SCENE_CAPTURE_TYPE">
<doc xml:space="preserve">Scene mode used when capturing an image. (string)
The allowed values are:
"standard"
"landscape"
"portrait"
"night-scene"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_SHARPNESS" value="capturing-sharpness" c:type="GST_TAG_CAPTURING_SHARPNESS">
<doc xml:space="preserve">Direction of sharpness processing applied when capturing an image. (string)
The allowed values are:
"normal"
"soft"
"hard"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_SHUTTER_SPEED" value="capturing-shutter-speed" c:type="GST_TAG_CAPTURING_SHUTTER_SPEED">
<doc xml:space="preserve">Shutter speed used when capturing an image, in seconds. (fraction)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_SOURCE" value="capturing-source" c:type="GST_TAG_CAPTURING_SOURCE">
<doc xml:space="preserve">Indicates the source of capture. The device/medium used to do the
capture. (string)
Allowed values are:
"dsc" (= digital still camera)
"transparent-scanner"
"reflex-scanner"
"other"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CAPTURING_WHITE_BALANCE" value="capturing-white-balance" c:type="GST_TAG_CAPTURING_WHITE_BALANCE">
<doc xml:space="preserve">White balance mode used when capturing an image. (string)
The allowed values are:
"auto"
"manual"
"daylight"
"cloudy"
"tungsten"
"fluorescent"
"fluorescent h" (newer daylight-calibrated fluorescents)
"flash"</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CDDA_CDDB_DISCID" value="discid" c:type="GST_TAG_CDDA_CDDB_DISCID">
<doc xml:space="preserve">CDDB disc id in its short form (e.g. 'aa063d0f')</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CDDA_CDDB_DISCID_FULL" value="discid-full" c:type="GST_TAG_CDDA_CDDB_DISCID_FULL">
<doc xml:space="preserve">CDDB disc id including all details</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CDDA_MUSICBRAINZ_DISCID" value="musicbrainz-discid" c:type="GST_TAG_CDDA_MUSICBRAINZ_DISCID">
<doc xml:space="preserve">Musicbrainz disc id (e.g. 'ahg7JUcfR3vCYBphSDIogOOWrr0-')</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CDDA_MUSICBRAINZ_DISCID_FULL" value="musicbrainz-discid-full" c:type="GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL">
<doc xml:space="preserve">Musicbrainz disc id details</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CMML_CLIP" value="cmml-clip" c:type="GST_TAG_CMML_CLIP">
<doc xml:space="preserve">Annodex CMML clip element tag</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CMML_HEAD" value="cmml-head" c:type="GST_TAG_CMML_HEAD">
<doc xml:space="preserve">Annodex CMML head element tag</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_CMML_STREAM" value="cmml-stream" c:type="GST_TAG_CMML_STREAM">
<doc xml:space="preserve">Annodex CMML stream element tag</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<function-macro name="TAG_DEMUX" c:identifier="GST_TAG_DEMUX" introspectable="0">
<parameters>
<parameter name="obj">
</parameter>
</parameters>
</function-macro>
<function-macro name="TAG_DEMUX_CLASS" c:identifier="GST_TAG_DEMUX_CLASS" introspectable="0">
<parameters>
<parameter name="klass">
</parameter>
</parameters>
</function-macro>
<constant name="TAG_ID3V2_HEADER_SIZE" value="10" c:type="GST_TAG_ID3V2_HEADER_SIZE">
<doc xml:space="preserve">ID3V2 header size considered minimum input for some functions such as
gst_tag_list_from_id3v2_tag() and gst_tag_get_id3v2_tag_size() for example.</doc>
<type name="gint" c:type="gint"/>
</constant>
<constant name="TAG_IMAGE_HORIZONTAL_PPI" value="image-horizontal-ppi" c:type="GST_TAG_IMAGE_HORIZONTAL_PPI">
<doc xml:space="preserve">Media (image/video) intended horizontal pixel density in ppi. (double)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_IMAGE_VERTICAL_PPI" value="image-vertical-ppi" c:type="GST_TAG_IMAGE_VERTICAL_PPI">
<doc xml:space="preserve">Media (image/video) intended vertical pixel density in ppi. (double)</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICAL_KEY" value="musical-key" c:type="GST_TAG_MUSICAL_KEY" version="1.2">
<doc xml:space="preserve">Musical key in which the sound starts. It is represented as a string
with a maximum length of three characters. The ground keys are
represented with "A","B","C","D","E", "F" and "G" and halfkeys
represented with "b" and "#". Minor is represented as "m" (e.g. "Dbm").
Off key is represented with an "o" only.
This notation might be extended in the future to support non-minor/major
keys.</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICBRAINZ_ALBUMARTISTID" value="musicbrainz-albumartistid" c:type="GST_TAG_MUSICBRAINZ_ALBUMARTISTID">
<doc xml:space="preserve">MusicBrainz album artist ID</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICBRAINZ_ALBUMID" value="musicbrainz-albumid" c:type="GST_TAG_MUSICBRAINZ_ALBUMID">
<doc xml:space="preserve">MusicBrainz album ID</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICBRAINZ_ARTISTID" value="musicbrainz-artistid" c:type="GST_TAG_MUSICBRAINZ_ARTISTID">
<doc xml:space="preserve">MusicBrainz artist ID</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICBRAINZ_RELEASEGROUPID" value="musicbrainz-releasegroupid" c:type="GST_TAG_MUSICBRAINZ_RELEASEGROUPID" version="1.18">
<doc xml:space="preserve">MusicBrainz Release Group ID</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICBRAINZ_RELEASETRACKID" value="musicbrainz-releasetrackid" c:type="GST_TAG_MUSICBRAINZ_RELEASETRACKID" version="1.18">
<doc xml:space="preserve">MusicBrainz Release Track ID</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICBRAINZ_TRACKID" value="musicbrainz-trackid" c:type="GST_TAG_MUSICBRAINZ_TRACKID">
<doc xml:space="preserve">MusicBrainz track ID</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<constant name="TAG_MUSICBRAINZ_TRMID" value="musicbrainz-trmid" c:type="GST_TAG_MUSICBRAINZ_TRMID">
<doc xml:space="preserve">MusicBrainz track TRM ID</doc>
<type name="utf8" c:type="gchar*"/>
</constant>
<function-macro name="TAG_MUX" c:identifier="GST_TAG_MUX" introspectable="0">
<parameters>
<parameter name="obj">
</parameter>
</parameters>
</function-macro>
<function-macro name="TAG_MUX_CLASS" c:identifier="GST_TAG_MUX_CLASS" introspectable="0">
<parameters>
<parameter name="klass">
</parameter>
</parameters>
</function-macro>
<function-macro name="TAG_XMP_WRITER" c:identifier="GST_TAG_XMP_WRITER" introspectable="0">
<parameters>
<parameter name="obj">
</parameter>
</parameters>
</function-macro>
<function-macro name="TAG_XMP_WRITER_GET_INTERFACE" c:identifier="GST_TAG_XMP_WRITER_GET_INTERFACE" introspectable="0">
<parameters>
<parameter name="inst">
</parameter>
</parameters>
</function-macro>
<class name="TagDemux" c:symbol-prefix="tag_demux" c:type="GstTagDemux" parent="Gst.Element" abstract="1" glib:type-name="GstTagDemux" glib:get-type="gst_tag_demux_get_type" glib:type-struct="TagDemuxClass">
<doc xml:space="preserve">Provides a base class for demuxing tags at the beginning or end of a
stream and handles things like typefinding, querying, seeking, and
different modes of operation (chain-based, pull_range-based, and providing
downstream elements with random access if upstream supports that). The tag
is stripped from the output, and all offsets are adjusted for the tag
sizes, so that to the downstream element the stream will appear as if
there was no tag at all. Also, once the tag has been parsed, GstTagDemux
will try to determine the media type of the resulting stream and add a
source pad with the appropriate caps in order to facilitate auto-plugging.
## Deriving from GstTagDemux
Subclasses have to do four things:
* In their base init function, they must add a pad template for the sink
pad to the element class, describing the media type they can parse in
the caps of the pad template.
* In their class init function, they must override
GST_TAG_DEMUX_CLASS(demux_klass)->identify_tag with their own identify
function.
* In their class init function, they must override
GST_TAG_DEMUX_CLASS(demux_klass)->parse_tag with their own parse
function.
* In their class init function, they must also set
GST_TAG_DEMUX_CLASS(demux_klass)->min_start_size and/or
GST_TAG_DEMUX_CLASS(demux_klass)->min_end_size to the minimum size required
for the identify function to decide whether the stream has a supported tag
or not. A class parsing ID3v1 tags, for example, would set min_end_size to
128 bytes.</doc>
<virtual-method name="identify_tag">
<doc xml:space="preserve">identify tag and determine the size required to parse the
tag. Buffer may be larger than the specified minimum size.
Subclassed MUST override this vfunc in their class_init function.</doc>
<return-value transfer-ownership="none">
<type name="gboolean" c:type="gboolean"/>
</return-value>
<parameters>
<instance-parameter name="demux" transfer-ownership="none">
<type name="TagDemux" c:type="GstTagDemux*"/>
</instance-parameter>
<parameter name="buffer" transfer-ownership="none">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</parameter>
<parameter name="start_tag" transfer-ownership="none">
<type name="gboolean" c:type="gboolean"/>
</parameter>
<parameter name="tag_size" transfer-ownership="none">
<type name="guint" c:type="guint*"/>
</parameter>
</parameters>
</virtual-method>
<virtual-method name="merge_tags">
<doc xml:space="preserve">merge start and end tags. Subclasses may want to override this
vfunc to allow prioritising of start or end tag according to user
preference. Note that both start_tags and end_tags may be NULL. By default
start tags are preferred over end tags.</doc>
<return-value transfer-ownership="full">
<type name="Gst.TagList" c:type="GstTagList*"/>
</return-value>
<parameters>
<instance-parameter name="demux" transfer-ownership="none">
<type name="TagDemux" c:type="GstTagDemux*"/>
</instance-parameter>
<parameter name="start_tags" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
<parameter name="end_tags" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
</parameters>
</virtual-method>
<virtual-method name="parse_tag">
<doc xml:space="preserve">parse the tag. Buffer will be exactly of the size determined by
the identify_tag vfunc before. The parse_tag vfunc may change the size
stored in *tag_size and return GST_TAG_DEMUX_RESULT_AGAIN to request a
larger or smaller buffer. It is also permitted to adjust the tag_size to a
smaller value and then return GST_TAG_DEMUX_RESULT_OK in one go.
Subclassed MUST override the parse_tag vfunc in their class_init function.</doc>
<return-value transfer-ownership="none">
<type name="TagDemuxResult" c:type="GstTagDemuxResult"/>
</return-value>
<parameters>
<instance-parameter name="demux" transfer-ownership="none">
<type name="TagDemux" c:type="GstTagDemux*"/>
</instance-parameter>
<parameter name="buffer" transfer-ownership="none">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</parameter>
<parameter name="start_tag" transfer-ownership="none">
<type name="gboolean" c:type="gboolean"/>
</parameter>
<parameter name="tag_size" transfer-ownership="none">
<type name="guint" c:type="guint*"/>
</parameter>
<parameter name="tags" transfer-ownership="none">
<type name="Gst.TagList" c:type="GstTagList**"/>
</parameter>
</parameters>
</virtual-method>
<field name="element">
<doc xml:space="preserve">parent element</doc>
<type name="Gst.Element" c:type="GstElement"/>
</field>
<field name="priv" readable="0" private="1">
<type name="TagDemuxPrivate" c:type="GstTagDemuxPrivate*"/>
</field>
<field name="reserved" readable="0" private="1">
<array zero-terminated="0" fixed-size="4">
<type name="gpointer" c:type="gpointer"/>
</array>
</field>
</class>
<record name="TagDemuxClass" c:type="GstTagDemuxClass" glib:is-gtype-struct-for="TagDemux">
<doc xml:space="preserve">The #GstTagDemuxClass structure. See documentation at beginning of section
for details about what subclasses need to override and do.</doc>
<field name="parent_class">
<doc xml:space="preserve">the parent class.</doc>
<type name="Gst.ElementClass" c:type="GstElementClass"/>
</field>
<field name="min_start_size">
<doc xml:space="preserve">minimum size required to identify a tag at the start and
determine its total size. Set to 0 if not interested in start tags.
Subclasses should set this in their class_init function.</doc>
<type name="guint" c:type="guint"/>
</field>
<field name="min_end_size">
<doc xml:space="preserve">minimum size required to identify a tag at the end and
determine its total size. Set to 0 if not interested in end tags.
Subclasses should set this in their class_init function.</doc>
<type name="guint" c:type="guint"/>
</field>
<field name="identify_tag">
<doc xml:space="preserve">identify tag and determine the size required to parse the
tag. Buffer may be larger than the specified minimum size.
Subclassed MUST override this vfunc in their class_init function.</doc>
<callback name="identify_tag">
<return-value transfer-ownership="none">
<type name="gboolean" c:type="gboolean"/>
</return-value>
<parameters>
<parameter name="demux" transfer-ownership="none">
<type name="TagDemux" c:type="GstTagDemux*"/>
</parameter>
<parameter name="buffer" transfer-ownership="none">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</parameter>
<parameter name="start_tag" transfer-ownership="none">
<type name="gboolean" c:type="gboolean"/>
</parameter>
<parameter name="tag_size" transfer-ownership="none">
<type name="guint" c:type="guint*"/>
</parameter>
</parameters>
</callback>
</field>
<field name="parse_tag">
<doc xml:space="preserve">parse the tag. Buffer will be exactly of the size determined by
the identify_tag vfunc before. The parse_tag vfunc may change the size
stored in *tag_size and return GST_TAG_DEMUX_RESULT_AGAIN to request a
larger or smaller buffer. It is also permitted to adjust the tag_size to a
smaller value and then return GST_TAG_DEMUX_RESULT_OK in one go.
Subclassed MUST override the parse_tag vfunc in their class_init function.</doc>
<callback name="parse_tag">
<return-value transfer-ownership="none">
<type name="TagDemuxResult" c:type="GstTagDemuxResult"/>
</return-value>
<parameters>
<parameter name="demux" transfer-ownership="none">
<type name="TagDemux" c:type="GstTagDemux*"/>
</parameter>
<parameter name="buffer" transfer-ownership="none">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</parameter>
<parameter name="start_tag" transfer-ownership="none">
<type name="gboolean" c:type="gboolean"/>
</parameter>
<parameter name="tag_size" transfer-ownership="none">
<type name="guint" c:type="guint*"/>
</parameter>
<parameter name="tags" transfer-ownership="none">
<type name="Gst.TagList" c:type="GstTagList**"/>
</parameter>
</parameters>
</callback>
</field>
<field name="merge_tags">
<doc xml:space="preserve">merge start and end tags. Subclasses may want to override this
vfunc to allow prioritising of start or end tag according to user
preference. Note that both start_tags and end_tags may be NULL. By default
start tags are preferred over end tags.</doc>
<callback name="merge_tags">
<return-value transfer-ownership="full">
<type name="Gst.TagList" c:type="GstTagList*"/>
</return-value>
<parameters>
<parameter name="demux" transfer-ownership="none">
<type name="TagDemux" c:type="GstTagDemux*"/>
</parameter>
<parameter name="start_tags" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
<parameter name="end_tags" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
</parameters>
</callback>
</field>
<field name="reserved" readable="0" private="1">
<array zero-terminated="0" fixed-size="4">
<type name="gpointer" c:type="gpointer"/>
</array>
</field>
</record>
<record name="TagDemuxPrivate" c:type="GstTagDemuxPrivate" disguised="1" opaque="1"/>
<enumeration name="TagDemuxResult" glib:type-name="GstTagDemuxResult" glib:get-type="gst_tag_demux_result_get_type" c:type="GstTagDemuxResult">
<doc xml:space="preserve">Result values from the parse_tag virtual function.</doc>
<member name="broken_tag" value="0" c:identifier="GST_TAG_DEMUX_RESULT_BROKEN_TAG" glib:nick="broken-tag" glib:name="GST_TAG_DEMUX_RESULT_BROKEN_TAG">
<doc xml:space="preserve">cannot parse tag, just skip it</doc>
</member>
<member name="again" value="1" c:identifier="GST_TAG_DEMUX_RESULT_AGAIN" glib:nick="again" glib:name="GST_TAG_DEMUX_RESULT_AGAIN">
<doc xml:space="preserve">call again with less or more data</doc>
</member>
<member name="ok" value="2" c:identifier="GST_TAG_DEMUX_RESULT_OK" glib:nick="ok" glib:name="GST_TAG_DEMUX_RESULT_OK">
<doc xml:space="preserve">parsed tag successfully</doc>
</member>
</enumeration>
<enumeration name="TagImageType" glib:type-name="GstTagImageType" glib:get-type="gst_tag_image_type_get_type" c:type="GstTagImageType">
<doc xml:space="preserve">Type of image contained in an image tag (specified as "image-type" field in
the info structure in the image's #GstSample)</doc>
<member name="none" value="-1" c:identifier="GST_TAG_IMAGE_TYPE_NONE" glib:nick="none" glib:name="GST_TAG_IMAGE_TYPE_NONE">
<doc xml:space="preserve">No image type. Can be used to
tell functions such as gst_tag_image_data_to_image_sample() that no
image type should be set.</doc>
</member>
<member name="undefined" value="0" c:identifier="GST_TAG_IMAGE_TYPE_UNDEFINED" glib:nick="undefined" glib:name="GST_TAG_IMAGE_TYPE_UNDEFINED">
<doc xml:space="preserve">Undefined/other image type</doc>
</member>
<member name="front_cover" value="1" c:identifier="GST_TAG_IMAGE_TYPE_FRONT_COVER" glib:nick="front-cover" glib:name="GST_TAG_IMAGE_TYPE_FRONT_COVER">
<doc xml:space="preserve">Cover (front)</doc>
</member>
<member name="back_cover" value="2" c:identifier="GST_TAG_IMAGE_TYPE_BACK_COVER" glib:nick="back-cover" glib:name="GST_TAG_IMAGE_TYPE_BACK_COVER">
<doc xml:space="preserve">Cover (back)</doc>
</member>
<member name="leaflet_page" value="3" c:identifier="GST_TAG_IMAGE_TYPE_LEAFLET_PAGE" glib:nick="leaflet-page" glib:name="GST_TAG_IMAGE_TYPE_LEAFLET_PAGE">
<doc xml:space="preserve">Leaflet page</doc>
</member>
<member name="medium" value="4" c:identifier="GST_TAG_IMAGE_TYPE_MEDIUM" glib:nick="medium" glib:name="GST_TAG_IMAGE_TYPE_MEDIUM">
<doc xml:space="preserve">Medium (e.g. label side of CD)</doc>
</member>
<member name="lead_artist" value="5" c:identifier="GST_TAG_IMAGE_TYPE_LEAD_ARTIST" glib:nick="lead-artist" glib:name="GST_TAG_IMAGE_TYPE_LEAD_ARTIST">
<doc xml:space="preserve">Lead artist/lead performer/soloist</doc>
</member>
<member name="artist" value="6" c:identifier="GST_TAG_IMAGE_TYPE_ARTIST" glib:nick="artist" glib:name="GST_TAG_IMAGE_TYPE_ARTIST">
<doc xml:space="preserve">Artist/performer</doc>
</member>
<member name="conductor" value="7" c:identifier="GST_TAG_IMAGE_TYPE_CONDUCTOR" glib:nick="conductor" glib:name="GST_TAG_IMAGE_TYPE_CONDUCTOR">
<doc xml:space="preserve">Conductor</doc>
</member>
<member name="band_orchestra" value="8" c:identifier="GST_TAG_IMAGE_TYPE_BAND_ORCHESTRA" glib:nick="band-orchestra" glib:name="GST_TAG_IMAGE_TYPE_BAND_ORCHESTRA">
<doc xml:space="preserve">Band/orchestra</doc>
</member>
<member name="composer" value="9" c:identifier="GST_TAG_IMAGE_TYPE_COMPOSER" glib:nick="composer" glib:name="GST_TAG_IMAGE_TYPE_COMPOSER">
<doc xml:space="preserve">Composer</doc>
</member>
<member name="lyricist" value="10" c:identifier="GST_TAG_IMAGE_TYPE_LYRICIST" glib:nick="lyricist" glib:name="GST_TAG_IMAGE_TYPE_LYRICIST">
<doc xml:space="preserve">Lyricist/text writer</doc>
</member>
<member name="recording_location" value="11" c:identifier="GST_TAG_IMAGE_TYPE_RECORDING_LOCATION" glib:nick="recording-location" glib:name="GST_TAG_IMAGE_TYPE_RECORDING_LOCATION">
<doc xml:space="preserve">Recording location</doc>
</member>
<member name="during_recording" value="12" c:identifier="GST_TAG_IMAGE_TYPE_DURING_RECORDING" glib:nick="during-recording" glib:name="GST_TAG_IMAGE_TYPE_DURING_RECORDING">
<doc xml:space="preserve">During recording</doc>
</member>
<member name="during_performance" value="13" c:identifier="GST_TAG_IMAGE_TYPE_DURING_PERFORMANCE" glib:nick="during-performance" glib:name="GST_TAG_IMAGE_TYPE_DURING_PERFORMANCE">
<doc xml:space="preserve">During performance</doc>
</member>
<member name="video_capture" value="14" c:identifier="GST_TAG_IMAGE_TYPE_VIDEO_CAPTURE" glib:nick="video-capture" glib:name="GST_TAG_IMAGE_TYPE_VIDEO_CAPTURE">
<doc xml:space="preserve">Movie/video screen capture</doc>
</member>
<member name="fish" value="15" c:identifier="GST_TAG_IMAGE_TYPE_FISH" glib:nick="fish" glib:name="GST_TAG_IMAGE_TYPE_FISH">
<doc xml:space="preserve">A fish as funny as the ID3v2 spec</doc>
</member>
<member name="illustration" value="16" c:identifier="GST_TAG_IMAGE_TYPE_ILLUSTRATION" glib:nick="illustration" glib:name="GST_TAG_IMAGE_TYPE_ILLUSTRATION">
<doc xml:space="preserve">Illustration</doc>
</member>
<member name="band_artist_logo" value="17" c:identifier="GST_TAG_IMAGE_TYPE_BAND_ARTIST_LOGO" glib:nick="band-artist-logo" glib:name="GST_TAG_IMAGE_TYPE_BAND_ARTIST_LOGO">
<doc xml:space="preserve">Band/artist logotype</doc>
</member>
<member name="publisher_studio_logo" value="18" c:identifier="GST_TAG_IMAGE_TYPE_PUBLISHER_STUDIO_LOGO" glib:nick="publisher-studio-logo" glib:name="GST_TAG_IMAGE_TYPE_PUBLISHER_STUDIO_LOGO">
<doc xml:space="preserve">Publisher/studio logotype</doc>
</member>
</enumeration>
<bitfield name="TagLicenseFlags" glib:type-name="GstTagLicenseFlags" glib:get-type="gst_tag_license_flags_get_type" c:type="GstTagLicenseFlags">
<doc xml:space="preserve">See http://creativecommons.org/ns for more information.</doc>
<member name="permits_reproduction" value="1" c:identifier="GST_TAG_LICENSE_PERMITS_REPRODUCTION" glib:nick="permits-reproduction" glib:name="GST_TAG_LICENSE_PERMITS_REPRODUCTION">
<doc xml:space="preserve">making multiple copies
is allowed</doc>
</member>
<member name="permits_distribution" value="2" c:identifier="GST_TAG_LICENSE_PERMITS_DISTRIBUTION" glib:nick="permits-distribution" glib:name="GST_TAG_LICENSE_PERMITS_DISTRIBUTION">
<doc xml:space="preserve">distribution, public display
and public performance are allowed</doc>
</member>
<member name="permits_derivative_works" value="4" c:identifier="GST_TAG_LICENSE_PERMITS_DERIVATIVE_WORKS" glib:nick="permits-derivative-works" glib:name="GST_TAG_LICENSE_PERMITS_DERIVATIVE_WORKS">
<doc xml:space="preserve">distribution of derivative
works is allowed</doc>
</member>
<member name="permits_sharing" value="8" c:identifier="GST_TAG_LICENSE_PERMITS_SHARING" glib:nick="permits-sharing" glib:name="GST_TAG_LICENSE_PERMITS_SHARING">
<doc xml:space="preserve">commercial derivatives are allowed,
but only non-commercial distribution is allowed</doc>
</member>
<member name="requires_notice" value="256" c:identifier="GST_TAG_LICENSE_REQUIRES_NOTICE" glib:nick="requires-notice" glib:name="GST_TAG_LICENSE_REQUIRES_NOTICE">
<doc xml:space="preserve">copyright and license notices
must be kept intact</doc>
</member>
<member name="requires_attribution" value="512" c:identifier="GST_TAG_LICENSE_REQUIRES_ATTRIBUTION" glib:nick="requires-attribution" glib:name="GST_TAG_LICENSE_REQUIRES_ATTRIBUTION">
<doc xml:space="preserve">credit must be given to
copyright holder and/or author</doc>
</member>
<member name="requires_share_alike" value="1024" c:identifier="GST_TAG_LICENSE_REQUIRES_SHARE_ALIKE" glib:nick="requires-share-alike" glib:name="GST_TAG_LICENSE_REQUIRES_SHARE_ALIKE">
<doc xml:space="preserve">derivative works must be
licensed under the same terms or compatible terms as the original work</doc>
</member>
<member name="requires_source_code" value="2048" c:identifier="GST_TAG_LICENSE_REQUIRES_SOURCE_CODE" glib:nick="requires-source-code" glib:name="GST_TAG_LICENSE_REQUIRES_SOURCE_CODE">
<doc xml:space="preserve">source code (the preferred
form for making modifications) must be provided when exercising some
rights granted by the license</doc>
</member>
<member name="requires_copyleft" value="4096" c:identifier="GST_TAG_LICENSE_REQUIRES_COPYLEFT" glib:nick="requires-copyleft" glib:name="GST_TAG_LICENSE_REQUIRES_COPYLEFT">
<doc xml:space="preserve">derivative and combined works
must be licensed under specified terms, similar to those of the original
work</doc>
</member>
<member name="requires_lesser_copyleft" value="8192" c:identifier="GST_TAG_LICENSE_REQUIRES_LESSER_COPYLEFT" glib:nick="requires-lesser-copyleft" glib:name="GST_TAG_LICENSE_REQUIRES_LESSER_COPYLEFT">
<doc xml:space="preserve">derivative works must be
licensed under specified terms, with at least the same conditions as
the original work; combinations with the work may be licensed under
different terms</doc>
</member>
<member name="prohibits_commercial_use" value="65536" c:identifier="GST_TAG_LICENSE_PROHIBITS_COMMERCIAL_USE" glib:nick="prohibits-commercial-use" glib:name="GST_TAG_LICENSE_PROHIBITS_COMMERCIAL_USE">
<doc xml:space="preserve">exercising rights for
commercial purposes is prohibited</doc>
</member>
<member name="prohibits_high_income_nation_use" value="131072" c:identifier="GST_TAG_LICENSE_PROHIBITS_HIGH_INCOME_NATION_USE" glib:nick="prohibits-high-income-nation-use" glib:name="GST_TAG_LICENSE_PROHIBITS_HIGH_INCOME_NATION_USE">
<doc xml:space="preserve">use in a
non-developing country is prohibited</doc>
</member>
<member name="creative_commons_license" value="16777216" c:identifier="GST_TAG_LICENSE_CREATIVE_COMMONS_LICENSE" glib:nick="creative-commons-license" glib:name="GST_TAG_LICENSE_CREATIVE_COMMONS_LICENSE">
<doc xml:space="preserve">this license was created
by the Creative Commons project</doc>
</member>
<member name="free_software_foundation_license" value="33554432" c:identifier="GST_TAG_LICENSE_FREE_SOFTWARE_FOUNDATION_LICENSE" glib:nick="free-software-foundation-license" glib:name="GST_TAG_LICENSE_FREE_SOFTWARE_FOUNDATION_LICENSE">
<doc xml:space="preserve">this license was
created by the Free Software Foundation (FSF)</doc>
</member>
</bitfield>
<class name="TagMux" c:symbol-prefix="tag_mux" c:type="GstTagMux" parent="Gst.Element" abstract="1" glib:type-name="GstTagMux" glib:get-type="gst_tag_mux_get_type" glib:type-struct="TagMuxClass">
<doc xml:space="preserve">Provides a base class for adding tags at the beginning or end of a
stream.
## Deriving from GstTagMux
Subclasses have to do the following things:
* In their base init function, they must add pad templates for the sink
pad and the source pad to the element class, describing the media type
they accept and output in the caps of the pad template.
* In their class init function, they must override the
GST_TAG_MUX_CLASS(mux_klass)->render_start_tag and/or
GST_TAG_MUX_CLASS(mux_klass)->render_end_tag vfuncs and set up a render
function.</doc>
<implements name="Gst.TagSetter"/>
<virtual-method name="render_end_tag">
<doc xml:space="preserve">create a tag buffer to add to the end of the
input stream given a tag list, or NULL</doc>
<return-value transfer-ownership="full">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</return-value>
<parameters>
<instance-parameter name="mux" transfer-ownership="none">
<type name="TagMux" c:type="GstTagMux*"/>
</instance-parameter>
<parameter name="tag_list" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
</parameters>
</virtual-method>
<virtual-method name="render_start_tag">
<doc xml:space="preserve">create a tag buffer to add to the beginning of the
input stream given a tag list, or NULL</doc>
<return-value transfer-ownership="full">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</return-value>
<parameters>
<instance-parameter name="mux" transfer-ownership="none">
<type name="TagMux" c:type="GstTagMux*"/>
</instance-parameter>
<parameter name="tag_list" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
</parameters>
</virtual-method>
<field name="element">
<doc xml:space="preserve">parent element</doc>
<type name="Gst.Element" c:type="GstElement"/>
</field>
<field name="priv" readable="0" private="1">
<type name="TagMuxPrivate" c:type="GstTagMuxPrivate*"/>
</field>
<field name="_gst_reserved" readable="0" private="1">
<array zero-terminated="0" fixed-size="4">
<type name="gpointer" c:type="gpointer"/>
</array>
</field>
</class>
<record name="TagMuxClass" c:type="GstTagMuxClass" glib:is-gtype-struct-for="TagMux">
<doc xml:space="preserve">The #GstTagMuxClass structure. Subclasses need to override at least one
of the two render vfuncs.</doc>
<field name="parent_class">
<doc xml:space="preserve">the parent class.</doc>
<type name="Gst.ElementClass" c:type="GstElementClass"/>
</field>
<field name="render_start_tag">
<doc xml:space="preserve">create a tag buffer to add to the beginning of the
input stream given a tag list, or NULL</doc>
<callback name="render_start_tag">
<return-value transfer-ownership="full">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</return-value>
<parameters>
<parameter name="mux" transfer-ownership="none">
<type name="TagMux" c:type="GstTagMux*"/>
</parameter>
<parameter name="tag_list" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
</parameters>
</callback>
</field>
<field name="render_end_tag">
<doc xml:space="preserve">create a tag buffer to add to the end of the
input stream given a tag list, or NULL</doc>
<callback name="render_end_tag">
<return-value transfer-ownership="full">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</return-value>
<parameters>
<parameter name="mux" transfer-ownership="none">
<type name="TagMux" c:type="GstTagMux*"/>
</parameter>
<parameter name="tag_list" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
</parameters>
</callback>
</field>
<field name="_gst_reserved" readable="0" private="1">
<array zero-terminated="0" fixed-size="4">
<type name="gpointer" c:type="gpointer"/>
</array>
</field>
</record>
<record name="TagMuxPrivate" c:type="GstTagMuxPrivate" disguised="1" opaque="1"/>
<interface name="TagXmpWriter" c:symbol-prefix="tag_xmp_writer" c:type="GstTagXmpWriter" glib:type-name="GstTagXmpWriter" glib:get-type="gst_tag_xmp_writer_get_type" glib:type-struct="TagXmpWriterInterface">
<doc xml:space="preserve">This interface is implemented by elements that are able to do XMP serialization. Examples for
such elements are #jifmux and #qtmux.
Applications can use this interface to configure which XMP schemas should be used when serializing
tags into XMP. Schemas are represented by their names, a full list of the supported schemas can be
obtained from gst_tag_xmp_list_schemas(). By default, all schemas are used.</doc>
<prerequisite name="Gst.Element"/>
<method name="add_all_schemas" c:identifier="gst_tag_xmp_writer_add_all_schemas">
<doc xml:space="preserve">Adds all available XMP schemas to the configuration. Meaning that
all will be used.</doc>
<return-value transfer-ownership="none">
<type name="none" c:type="void"/>
</return-value>
<parameters>
<instance-parameter name="config" transfer-ownership="none">
<doc xml:space="preserve">a #GstTagXmpWriter</doc>
<type name="TagXmpWriter" c:type="GstTagXmpWriter*"/>
</instance-parameter>
</parameters>
</method>
<method name="add_schema" c:identifier="gst_tag_xmp_writer_add_schema">
<doc xml:space="preserve">Adds @schema to the list schemas</doc>
<return-value transfer-ownership="none">
<type name="none" c:type="void"/>
</return-value>
<parameters>
<instance-parameter name="config" transfer-ownership="none">
<doc xml:space="preserve">a #GstTagXmpWriter</doc>
<type name="TagXmpWriter" c:type="GstTagXmpWriter*"/>
</instance-parameter>
<parameter name="schema" transfer-ownership="none">
<doc xml:space="preserve">the schema to be added</doc>
<type name="utf8" c:type="const gchar*"/>
</parameter>
</parameters>
</method>
<method name="has_schema" c:identifier="gst_tag_xmp_writer_has_schema">
<doc xml:space="preserve">Checks if @schema is going to be used</doc>
<return-value transfer-ownership="none">
<doc xml:space="preserve">%TRUE if it is going to be used</doc>
<type name="gboolean" c:type="gboolean"/>
</return-value>
<parameters>
<instance-parameter name="config" transfer-ownership="none">
<doc xml:space="preserve">a #GstTagXmpWriter</doc>
<type name="TagXmpWriter" c:type="GstTagXmpWriter*"/>
</instance-parameter>
<parameter name="schema" transfer-ownership="none">
<doc xml:space="preserve">the schema to test</doc>
<type name="utf8" c:type="const gchar*"/>
</parameter>
</parameters>
</method>
<method name="remove_all_schemas" c:identifier="gst_tag_xmp_writer_remove_all_schemas">
<doc xml:space="preserve">Removes all schemas from the list of schemas to use. Meaning that no
XMP will be generated.</doc>
<return-value transfer-ownership="none">
<type name="none" c:type="void"/>
</return-value>
<parameters>
<instance-parameter name="config" transfer-ownership="none">
<doc xml:space="preserve">a #GstTagXmpWriter</doc>
<type name="TagXmpWriter" c:type="GstTagXmpWriter*"/>
</instance-parameter>
</parameters>
</method>
<method name="remove_schema" c:identifier="gst_tag_xmp_writer_remove_schema">
<doc xml:space="preserve">Removes a schema from the list of schemas to use. Nothing is done if
the schema wasn't in the list</doc>
<return-value transfer-ownership="none">
<type name="none" c:type="void"/>
</return-value>
<parameters>
<instance-parameter name="config" transfer-ownership="none">
<doc xml:space="preserve">a #GstTagXmpWriter</doc>
<type name="TagXmpWriter" c:type="GstTagXmpWriter*"/>
</instance-parameter>
<parameter name="schema" transfer-ownership="none">
<doc xml:space="preserve">the schema to remove</doc>
<type name="utf8" c:type="const gchar*"/>
</parameter>
</parameters>
</method>
<method name="tag_list_to_xmp_buffer" c:identifier="gst_tag_xmp_writer_tag_list_to_xmp_buffer">
<return-value transfer-ownership="full">
<type name="Gst.Buffer" c:type="GstBuffer*"/>
</return-value>
<parameters>
<instance-parameter name="config" transfer-ownership="none">
<type name="TagXmpWriter" c:type="GstTagXmpWriter*"/>
</instance-parameter>
<parameter name="taglist" transfer-ownership="none">
<type name="Gst.TagList" c:type="const GstTagList*"/>
</parameter>
<parameter name="read_only" transfer-ownership="none">
<type name="gboolean" c:type="gboolean"/>
</parameter>
</parameters>
</method>
</interface>
<record name="TagXmpWriterInterface" c:type="GstTagXmpWriterInterface" glib:is-gtype-struct-for="TagXmpWriter">
<field name="parent">
<type name="GObject.TypeInterface" c:type="GTypeInterface"/>
</field>
</record>
<docsection name="gsttag">
<doc xml:space="preserve">Contains additional standardized GStreamer tag definitions for plugins
and applications, and functions to register them with the GStreamer
tag system.</doc>
</docsection>
<docsection name="gsttagexif">
<doc xml:space="preserve">Contains utility function to parse #GstTagList<!-- -->s from exif
buffers and to create exif buffers from #GstTagList<!-- -->s
Note that next IFD fields on the created exif buffers are set to 0.</doc>
</docsection>
<docsection name="gsttagid3">
<doc xml:space="preserve">Contains various utility functions for plugins to parse or create
ID3 tags and map ID3v2 identifiers to and from GStreamer identifiers.</doc>
</docsection>
<docsection name="gsttaglanguagecodes">
<doc xml:space="preserve">Provides helper functions to convert between the various ISO-639 language
codes, and to map language codes to language names.</doc>
</docsection>
<docsection name="gsttaglicenses">
<doc xml:space="preserve">Provides information about Creative Commons media licenses, which are
often expressed in media files as a license URI in tags. Also useful
for applications creating media files, in case the user wants to license
the content under a Creative Commons license.</doc>
</docsection>
<docsection name="gsttagvorbis">
<doc xml:space="preserve">Contains various utility functions for plugins to parse or create
vorbiscomments and map them to and from #GstTagList<!-- -->s.</doc>
</docsection>
<docsection name="gsttagxmp">
<doc xml:space="preserve">Contains various utility functions for plugins to parse or create
xmp packets and map them to and from #GstTagList<!-- -->s.
Please note that the xmp parser is very lightweight and not strict at all.</doc>
</docsection>
<function name="tag_check_language_code" c:identifier="gst_tag_check_language_code">
<doc xml:space="preserve">Check if a given string contains a known ISO 639 language code.
This is useful in situations where it's not clear whether a given
string is a language code (which should be put into a #GST_TAG_LANGUAGE_CODE
tag) or a free-form language name descriptor (which should be put into a
#GST_TAG_LANGUAGE_NAME tag instead).</doc>
<return-value transfer-ownership="none">
<doc xml:space="preserve">TRUE if the two- or three-letter language code in @lang_code
is a valid ISO-639 language code.</doc>
<type name="gboolean" c:type="gboolean"/>
</return-value>
<parameters>
<parameter name="lang_code" transfer-ownership="none">
<doc xml:space="preserve">ISO-639 language code (e.g. "deu" or "ger" or "de")</doc>
<type name="utf8" c:type="const gchar*"/>
</parameter>
</parameters>
</function>
<function name="tag_freeform_string_to_utf8" c:identifier="gst_tag_freeform_string_to_utf8">
<doc xml:space="preserve">Convenience function to read a string with unknown character encoding. If
the string is already in UTF-8 encoding, it will be returned right away.
If not it tries to detect byte-order-mark for UTF-16/32 cases and use that.
Otherwise, the environment will be searched for a number of environment
variables (whose names are specified in the NULL-terminated string array
@env_vars) containing a list of character encodings to try/use. If none
are specified, the current locale will be tried. If that also doesn't work,
WINDOWS-1252/ISO-8859-1 is assumed (which will almost always succeed).</doc>
<return-value transfer-ownership="full" nullable="1">
<doc xml:space="preserve">a newly-allocated string in UTF-8 encoding, or NULL</doc>
<type name="utf8" c:type="gchar*"/>
</return-value>
<parameters>
<parameter name="data" transfer-ownership="none">
<doc xml:space="preserve">string data</doc>
<array length="1" zero-terminated="0" c:type="const gchar*">
<type name="gchar"/>
</array>
</parameter>
<parameter name="size" transfer-ownership="none">
<doc xml:space="preserve">length of string data, or -1 if the string is NUL-terminated</doc>
<type name="gint" c:type="gint"/>
</parameter>
<parameter name="env_vars" transfer-ownership="none">
<doc xml:space="preserve">
a NULL-terminated string array of environment variable names, or NULL</doc>
<array c:type="const gchar**">
<type name="utf8" c:type="gchar*"/>
</array>
</parameter>
</parameters>
</function>
<function name="tag_from_id3_tag" c:identifier="gst_tag_from_id3_tag">
<doc xml:space="preserve">Looks up the GStreamer tag for a ID3v2 tag.</doc>
<return-value transfer-ownership="none" nullable="1">
<doc xml:space="preserve">The corresponding GStreamer tag or NULL if none exists.</doc>
<type name="utf8" c:type="const gchar*"/>
</return-value>
<parameters>
<parameter name="id3_tag" transfer-ownership="none">
<doc xml:space="preserve">ID3v2 tag to convert to GStreamer tag</doc>
<type name="utf8" c:type="const gchar*"/>
</parameter>
</parameters>
</function>
<function name="tag_from_id3_user_tag" c:identifier="gst_tag_from_id3_user_tag">
<doc xml:space="preserve">Looks up the GStreamer tag for an ID3v2 user tag (e.g. description in
TXXX frame or owner in UFID frame).</doc>
<return-value transfer-ownership="none" nullable="1">
<doc xml:space="preserve">The corresponding GStreamer tag or NULL if none exists.</doc>
<type name="utf8" c:type="const gchar*"/>
</return-value>
<parameters>
<parameter name="type" transfer-ownership="none">
<doc xml:space="preserve">the type of ID3v2 user tag (e.g. "TXXX" or "UDIF")</doc>