mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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1451 lines
48 KiB
XML
1451 lines
48 KiB
XML
<!-- ############ chapter ############# -->
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<chapter id="chapter-building-types">
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<title>Types and Properties</title>
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<para>
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There is a very large set of possible types that may be used to pass data
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between elements. Indeed, each new element that is defined may use a new
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data format (though unless at least one other element recognises that
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format, it will be most likely be useless since nothing will be able to
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link with it).
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</para>
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<para>
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In order for types to be useful, and for systems like autopluggers to
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work, it is necessary that all elements agree on the type definitions,
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and which properties are required for each type. The &GStreamer; framework
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itself simply provides the ability to define types and parameters, but
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does not fix the meaning of types and parameters, and does not enforce
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standards on the creation of new types. This is a matter for a policy to
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decide, not technical systems to enforce.
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</para>
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<para>
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For now, the policy is simple:
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<itemizedlist>
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<listitem>
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<para>
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Do not create a new type if you could use one which already exists.
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</para>
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</listitem>
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<listitem>
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<para>
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If creating a new type, discuss it first with the other &GStreamer;
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developers, on at least one of: IRC, mailing lists.
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</para>
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</listitem>
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<listitem>
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<para>
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Try to ensure that the name for a new format is as unlikely to
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conflict with anything else created already, and is not a more
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generalised name than it should be. For example: "audio/compressed"
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would be too generalised a name to represent audio data compressed
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with an mp3 codec. Instead "audio/mp3" might be an appropriate name,
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or "audio/compressed" could exist and have a property indicating the
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type of compression used.
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</para>
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</listitem>
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<listitem>
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<para>
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Ensure that, when you do create a new type, you specify it clearly,
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and get it added to the list of known types so that other developers
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can use the type correctly when writing their elements.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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<!-- ############ sect1 ############# -->
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<sect1 id="section-types-test" xreflabel="Building a Simple Format for Testing">
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<title>Building a Simple Format for Testing</title>
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<para>
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If you need a new format that has not yet been defined in our <xref
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linkend="section-types-definitions"/>, you will want to have some general
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guidelines on mimetype naming, properties and such. A mimetype would
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ideally be one defined by IANA; else, it should be in the form
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type/x-name, where type is the sort of data this mimetype handles (audio,
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video, ...) and name should be something specific for this specific type.
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Audio and video mimetypes should try to support the general audio/video
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properties (see the list), and can use their own properties, too. To get
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an idea of what properties we think are useful, see (again) the list.
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</para>
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<para>
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Take your time to find the right set of properties for your type. There
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is no reason to hurry. Also, experimenting with this is generally a good
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idea. Experience learns that theoretically thought-out types are good,
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but they still need practical use to assure that they serve their needs.
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Make sure that your property names do not clash with similar properties
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used in other types. If they match, make sure they mean the same thing;
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properties with different types but the same names are
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<emphasis>not</emphasis> allowed.
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</para>
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</sect1>
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<!-- ############ sect1 ############# -->
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<sect1 id="section-types-typefind" xreflabel="Typefind Functions and Autoplugging">
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<title>Typefind Functions and Autoplugging</title>
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<para>
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With only <emphasis>defining</emphasis> the types, we're not yet there.
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In order for a random data file to be recognized and played back as
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such, we need a way of recognizing their type out of the blue. For this
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purpose, <quote>typefinding</quote> was introduced. Typefinding is the
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process of detecting the type of a data stream. Typefinding consists of
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two separate parts: first, there's an unlimited number of functions
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that we call <emphasis>typefind functions</emphasis>, which are each
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able to recognize one or more types from an input stream. Then,
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secondly, there's a small engine which registers and calls each of
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those functions. This is the typefind core. On top of this typefind
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core, you would normally write an autoplugger, which is able to use
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this type detection system to dynamically build a pipeline around an
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input stream. Here, we will focus only on typefind functions.
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</para>
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<para>
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A typefind function usually lives in
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<filename>gst-plugins-base/gst/typefind/gsttypefindfunctions.c</filename>,
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unless there's a good reason (like library dependencies) to put it
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elsewhere. The reason for this centralization is to reduce the
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number of plugins that need to be loaded in order to detect a stream's
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type. Below is an example that will recognize AVI files, which start
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with a <quote>RIFF</quote> tag, then the size of the file and then an
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<quote>AVI </quote> tag:
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</para>
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<programlisting>
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static void
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gst_my_typefind_function (GstTypeFind *tf,
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gpointer data)
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{
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guint8 *data = gst_type_find_peek (tf, 0, 12);
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if (data &&
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GUINT32_FROM_LE (&((guint32 *) data)[0]) == GST_MAKE_FOURCC ('R','I','F','F') &&
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GUINT32_FROM_LE (&((guint32 *) data)[2]) == GST_MAKE_FOURCC ('A','V','I',' ')) {
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gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM,
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gst_caps_new_simple ("video/x-msvideo", NULL));
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}
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}
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static gboolean
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plugin_init (GstPlugin *plugin)
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{
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static gchar *exts[] = { "avi", NULL };
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if (!gst_type_find_register (plugin, "", GST_RANK_PRIMARY,
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gst_my_typefind_function, exts,
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gst_caps_new_simple ("video/x-msvideo",
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NULL), NULL))
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return FALSE;
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}
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</programlisting>
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<para>
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Note that
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<filename>gst-plugins/gst/typefind/gsttypefindfunctions.c</filename>
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has some simplification macros to decrease the amount of code. Make
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good use of those if you want to submit typefinding patches with new
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typefind functions.
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</para>
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<para>
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Autoplugging has been discussed in great detail in the Application
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Development Manual.
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</para>
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</sect1>
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<!-- ############ sect1 ############# -->
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<sect1 id="section-types-definitions" xreflabel="List of Defined Types">
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<title>List of Defined Types</title>
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<para>
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Below is a list of all the defined types in &GStreamer;. They are split
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up in separate tables for audio, video, container, subtitle and other
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types, for the sake of readability. Below each table might follow a
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list of notes that apply to that table. In the definition of each type,
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we try to follow the types and rules as defined by <ulink type="http"
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url="http://www.iana.org/assignments/media-types">
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IANA</ulink> for as far as possible.
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</para>
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<para>
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Jump directly to a specific table:
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<itemizedlist>
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<listitem>
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<para><xref linkend="table-audio-types"/></para>
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</listitem>
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<listitem>
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<para><xref linkend="table-video-types"/></para>
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</listitem>
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<listitem>
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<para><xref linkend="table-container-types"/></para>
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</listitem>
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<listitem>
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<para><xref linkend="table-subtitle-types"/></para>
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</listitem>
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<listitem>
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<para><xref linkend="table-other-types"/></para>
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</listitem>
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</itemizedlist>
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</para>
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<para>
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Note that many of the properties are not <emphasis>required</emphasis>,
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but rather <emphasis>optional</emphasis> properties. This means that
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most of these properties can be extracted from the container header,
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but that - in case the container header does not provide these - they
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can also be extracted by parsing the stream header or the stream
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content. The policy is that your element should provide the data that
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it knows about by only parsing its own content, not another element's
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content. Example: the AVI header provides samplerate of the contained
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audio stream in the header. MPEG system streams don't. This means that
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an AVI stream demuxer would provide samplerate as a property for MPEG
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audio streams, whereas an MPEG demuxer would not. A decoder needing
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this data would require a stream parser in between two extract this
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from the header or calculate it from the stream.
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</para>
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<table frame="all" id="table-audio-types" xreflabel="Table of Audio Types">
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<title>Table of Audio Types</title>
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<tgroup cols="6" align="left" colsep="1" rowsep="1">
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<colspec colnum="1" colname="cola1" colwidth="1*"/>
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<colspec colnum="6" colname="cola6" colwidth="6*"/>
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<spanspec spanname="fullwidth" namest="cola1" nameend="cola6"/>
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<thead>
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<row>
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<entry>Mime Type</entry>
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<entry>Description</entry>
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<entry>Property</entry>
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<entry>Property Type</entry>
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<entry>Property Values</entry>
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<entry>Property Description</entry>
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</row>
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</thead>
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<tbody valign="top">
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<!-- ############ subtitle ############# -->
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<row>
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<entry spanname="fullwidth">
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<emphasis>All audio types.</emphasis>
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry morerows="1">audio/*</entry>
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<entry morerows="1">
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<emphasis>All audio types</emphasis>
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</entry>
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<entry>rate</entry>
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<entry>integer</entry>
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<entry>greater than 0</entry>
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<entry>
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The sample rate of the data, in samples (per channel) per second.
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</entry>
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</row>
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<row>
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<entry>channels</entry>
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<entry>integer</entry>
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<entry>greater than 0</entry>
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<entry>
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The number of channels of audio data.
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</entry>
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</row>
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<!-- ############ subtitle ############# -->
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<row>
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<entry spanname="fullwidth">
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<emphasis>All raw audio types.</emphasis>
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry morerows="3">audio/x-raw-int</entry>
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<entry morerows="3">
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Unstructured and uncompressed raw fixed-integer audio data.
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</entry>
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<entry>endianness</entry>
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<entry>integer</entry>
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<entry>G_BIG_ENDIAN (4321) or G_LITTLE_ENDIAN (1234)</entry>
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<entry>
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The order of bytes in a sample. The value G_LITTLE_ENDIAN (1234)
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means <quote>little-endian</quote> (byte-order is <quote>least
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significant byte first</quote>). The value G_BIG_ENDIAN (4321)
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means <quote>big-endian</quote> (byte order is <quote>most
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significant byte first</quote>).
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</entry>
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</row>
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<row>
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<entry>signed</entry>
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<entry>boolean</entry>
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<entry>TRUE or FALSE</entry>
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<entry>
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Whether the values of the integer samples are signed or not.
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Signed samples use one bit to indicate sign (negative or
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positive) of the value. Unsigned samples are always positive.
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</entry>
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</row>
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<row>
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<entry>width</entry>
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<entry>integer</entry>
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<entry>greater than 0</entry>
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<entry>
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Number of bits allocated per sample.
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</entry>
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</row>
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<row>
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<entry>depth</entry>
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<entry>integer</entry>
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<entry>greater than 0</entry>
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<entry>
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The number of bits used per sample. This must be less than or
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equal to the width: If the depth is less than the width, the
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low bits are assumed to be the ones used. For example, a width
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of 32 and a depth of 24 means that each sample is stored in a
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32 bit word, but only the low 24 bits are actually used.
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry morerows="1">audio/x-raw-float</entry>
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<entry>
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Unstructured and uncompressed raw floating-point audio data.
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</entry>
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<entry>endianness</entry>
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<entry>integer</entry>
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<entry>G_BIG_ENDIAN (4321) or G_LITTLE_ENDIAN (1234)</entry>
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<entry>
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The order of bytes in a sample. The value G_LITTLE_ENDIAN (1234)
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means <quote>little-endian</quote> (byte-order is <quote>least
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significant byte first</quote>). The value G_BIG_ENDIAN (4321)
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means <quote>big-endian</quote> (byte order is <quote>most
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significant byte first</quote>).
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</entry>
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</row>
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<row>
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<entry>width</entry>
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<entry>integer</entry>
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<entry>greater than 0</entry>
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<entry>
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The amount of bits used and allocated per sample.
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</entry>
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</row>
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<!-- ############ subtitle ############# -->
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<row>
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<entry spanname="fullwidth">
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<emphasis>All encoded audio types.</emphasis>
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry>audio/x-ac3</entry>
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<entry>AC-3 or A52 audio streams.</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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<entry>
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There are currently no specific properties defined or needed for
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this type.
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry morerows="1">audio/x-adpcm</entry>
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<entry morerows="1">ADPCM Audio streams.</entry>
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<entry>layout</entry>
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<entry>string</entry>
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<entry>
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<quote>quicktime</quote>, <quote>dvi</quote>,
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<quote>microsoft</quote> or <quote>4xm</quote>.
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</entry>
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<entry>
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The layout defines the packing of the samples in the stream. In
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ADPCM, most formats store multiple samples per channel together.
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This number of samples differs per format, hence the different
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layouts. On the long term, we probably want this variable to die
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and use something more descriptive, but this will do for now.
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</entry>
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</row>
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<row>
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<entry>block_align</entry>
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<entry>integer</entry>
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<entry>
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Any
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</entry>
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<entry>
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Chunk buffer size.
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry>audio/x-cinepak</entry>
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<entry>Audio as provided in a Cinepak (Quicktime) stream.</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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<entry>
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There are currently no specific properties defined or needed for
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this type.
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry>audio/x-dv</entry>
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<entry>Audio as provided in a Digital Video stream.</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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<entry>
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There are currently no specific properties defined or needed for
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this type.
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</entry>
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</row>
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<!-- ############ type ############# -->
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<row>
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<entry>audio/x-flac</entry>
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<entry>Free Lossless Audio codec (FLAC).</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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<entry>
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There are currently no specific properties defined or needed for
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this type.
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</entry>
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</row>
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|
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<!-- ############ type ############# -->
|
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|
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<row>
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<entry>audio/x-gsm</entry>
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<entry>Data encoded by the GSM codec.</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
|
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<entry>
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There are currently no specific properties defined or needed for
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|
this type.
|
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</entry>
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</row>
|
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|
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<!-- ############ type ############# -->
|
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|
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<row>
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<entry>audio/x-alaw</entry>
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<entry>A-Law Audio.</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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<entry>
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There are currently no specific properties defined or needed for
|
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this type.
|
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</entry>
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</row>
|
|
|
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<!-- ############ type ############# -->
|
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|
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<row>
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<entry>audio/x-mulaw</entry>
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<entry>Mu-Law Audio.</entry>
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|
<entry></entry>
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<entry></entry>
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<entry></entry>
|
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<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
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<entry>audio/x-mace</entry>
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|
<entry>MACE Audio (used in Quicktime).</entry>
|
|
<entry>maceversion</entry>
|
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<entry>integer</entry>
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<entry>3 or 6</entry>
|
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<entry>
|
|
The version of the MACE audio codec used to encode the stream.
|
|
</entry>
|
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</row>
|
|
|
|
<!-- ############ type ############# -->
|
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|
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<row>
|
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<entry morerows="3">audio/mpeg</entry>
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<entry morerows="3">
|
|
Audio data compressed using the MPEG audio encoding scheme.
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|
</entry>
|
|
<entry>mpegversion</entry>
|
|
<entry>integer</entry>
|
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<entry>1, 2 or 4</entry>
|
|
<entry>
|
|
The MPEG-version used for encoding the data. The value 1 refers
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|
to MPEG-1, -2 and -2.5 layer 1, 2 or 3. The values 2 and 4 refer
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to the MPEG-AAC audio encoding schemes.
|
|
</entry>
|
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</row>
|
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<row>
|
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<entry>framed</entry>
|
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<entry>boolean</entry>
|
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<entry>0 or 1</entry>
|
|
<entry>
|
|
A true value indicates that each buffer contains exactly one
|
|
frame. A false value indicates that frames and buffers do not
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|
necessarily match up.
|
|
</entry>
|
|
</row>
|
|
<row>
|
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<entry>layer</entry>
|
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<entry>integer</entry>
|
|
<entry>1, 2, or 3</entry>
|
|
<entry>
|
|
The compression scheme layer used to compress the data
|
|
<emphasis>(only if mpegversion=1)</emphasis>.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>bitrate</entry>
|
|
<entry>integer</entry>
|
|
<entry>greater than 0</entry>
|
|
<entry>
|
|
The bitrate, in bits per second. For VBR (variable bitrate)
|
|
MPEG data, this is the average bitrate.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-qdm2</entry>
|
|
<entry>Data encoded by the QDM version 2 codec.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-pn-realaudio</entry>
|
|
<entry>Realmedia Audio data.</entry>
|
|
<entry>raversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1 or 2</entry>
|
|
<entry>
|
|
The version of the Real Audio codec used to encode the stream.
|
|
1 stands for a 14k4 stream, 2 stands for a 28k8 stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-speex</entry>
|
|
<entry>Data encoded by the Speex audio codec</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-vorbis</entry>
|
|
<entry>Vorbis audio data</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-wma</entry>
|
|
<entry>Windows Media Audio</entry>
|
|
<entry>wmaversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1,2 or 3</entry>
|
|
<entry>
|
|
The version of the WMA codec used to encode the stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-paris</entry>
|
|
<entry>Ensoniq PARIS audio</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-svx</entry>
|
|
<entry>Amiga IFF / SVX8 / SV16 audio</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-nist</entry>
|
|
<entry>Sphere NIST audio</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-voc</entry>
|
|
<entry>Sound Blaster VOC audio</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-ircam</entry>
|
|
<entry>Berkeley/IRCAM/CARL audio</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-w64</entry>
|
|
<entry>Sonic Foundry's 64 bit RIFF/WAV</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table frame="all" id="table-video-types" xreflabel="Table of Video Types">
|
|
<title>Table of Video Types</title>
|
|
<tgroup cols="6" align="left" colsep="1" rowsep="1">
|
|
<colspec colnum="1" colname="colv1" colwidth="1*"/>
|
|
<colspec colnum="6" colname="colv6" colwidth="6*"/>
|
|
<spanspec spanname="fullwidth" namest="colv1" nameend="colv6"/>
|
|
|
|
<thead>
|
|
<row>
|
|
<entry>Mime Type</entry>
|
|
<entry>Description</entry>
|
|
<entry>Property</entry>
|
|
<entry>Property Type</entry>
|
|
<entry>Property Values</entry>
|
|
<entry>Property Description</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody valign="top">
|
|
|
|
<!-- ############ subtitle ############# -->
|
|
|
|
<row>
|
|
<entry spanname="fullwidth">
|
|
<emphasis>All video types.</emphasis>
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry morerows="2">video/*</entry>
|
|
<entry morerows="2">
|
|
<emphasis>All video types</emphasis>
|
|
</entry>
|
|
<entry>width</entry>
|
|
<entry>integer</entry>
|
|
<entry>greater than 0</entry>
|
|
<entry>The width of the video image</entry>
|
|
</row>
|
|
<row>
|
|
<entry>height</entry>
|
|
<entry>integer</entry>
|
|
<entry>greater than 0</entry>
|
|
<entry>The height of the video image</entry>
|
|
</row>
|
|
<row>
|
|
<entry>framerate</entry>
|
|
<entry>fraction</entry>
|
|
<entry>greater or equal 0</entry>
|
|
<entry>
|
|
The (average) framerate in frames per second. Note that this
|
|
property does not guarantee in <emphasis>any</emphasis> way that
|
|
it will actually come close to this value. If you need a fixed
|
|
framerate, please use an element that provides that (such as
|
|
<quote>videorate</quote>). 0 means a variable framerate.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ subtitle ############# -->
|
|
|
|
<row>
|
|
<entry spanname="fullwidth">
|
|
<emphasis>All raw video types.</emphasis>
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-raw-yuv</entry>
|
|
<entry>YUV (or Y'Cb'Cr) video format.</entry>
|
|
<entry>format</entry>
|
|
<entry>fourcc</entry>
|
|
<entry>
|
|
YUY2, YVYU, UYVY, Y41P, IYU2, Y42B, YV12, I420, Y41B, YUV9, YVU9,
|
|
Y800
|
|
</entry>
|
|
<entry>
|
|
The layout of the video. See <ulink type="http"
|
|
url="http://www.fourcc.org/">FourCC definition site</ulink>
|
|
for references and definitions. YUY2, YVYU and UYVY are 4:2:2
|
|
packed-pixel, Y41P is 4:1:1 packed-pixel and IYU2 is 4:4:4
|
|
packed-pixel. Y42B is 4:2:2 planar, YV12 and I420 are 4:2:0
|
|
planar, Y41B is 4:1:1 planar and YUV9 and YVU9 are 4:1:0 planar.
|
|
Y800 contains Y-samples only (black/white).
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry morerows="3">video/x-raw-rgb</entry>
|
|
<entry morerows="3">Red-Green-Blue (RGB) video.</entry>
|
|
<entry>bpp</entry>
|
|
<entry>integer</entry>
|
|
<entry>greater than 0</entry>
|
|
<entry>
|
|
The number of bits allocated per pixel. This is usually 16, 24
|
|
or 32.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>depth</entry>
|
|
<entry>integer</entry>
|
|
<entry>greater than 0</entry>
|
|
<entry>
|
|
The number of bits used per pixel by the R/G/B components. This
|
|
is usually 15, 16 or 24.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>endianness</entry>
|
|
<entry>integer</entry>
|
|
<entry>G_BIG_ENDIAN (4321) or G_LITTLE_ENDIAN (1234)</entry>
|
|
<entry>
|
|
The order of bytes in a sample. The value G_LITTLE_ENDIAN (1234)
|
|
means <quote>little-endian</quote> (byte-order is <quote>least
|
|
significant byte first</quote>). The value G_BIG_ENDIAN (4321)
|
|
means <quote>big-endian</quote> (byte order is <quote>most
|
|
significant byte first</quote>). For 24/32bpp, this should always
|
|
be big endian because the byte order can be given in both.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>red_mask, green_mask and blue_mask</entry>
|
|
<entry>integer</entry>
|
|
<entry>any</entry>
|
|
<entry>
|
|
The masks that cover all the bits used by each of the samples.
|
|
The mask should be given in the endianness specified above. This
|
|
means that for 24/32bpp, the masks might be opposite to host byte
|
|
order (if you are working on little-endian computers).
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ subtitle ############# -->
|
|
|
|
<row>
|
|
<entry spanname="fullwidth">
|
|
<emphasis>All encoded video types.</emphasis>
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-3ivx</entry>
|
|
<entry>3ivx video.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-divx</entry>
|
|
<entry>DivX video.</entry>
|
|
<entry>divxversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>3, 4 or 5</entry>
|
|
<entry>
|
|
Version of the DivX codec used to encode the stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-dv</entry>
|
|
<entry>Digital Video.</entry>
|
|
<entry>systemstream</entry>
|
|
<entry>boolean</entry>
|
|
<entry>FALSE</entry>
|
|
<entry>
|
|
Indicates that this stream is <emphasis>not</emphasis> a system
|
|
container stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-ffv</entry>
|
|
<entry>FFMpeg video.</entry>
|
|
<entry>ffvversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1</entry>
|
|
<entry>
|
|
Version of the FFMpeg video codec used to encode the stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry morerows="1">video/x-h263</entry>
|
|
<entry morerows="1">H-263 video.</entry>
|
|
<entry>variant</entry>
|
|
<entry>string</entry>
|
|
<entry>itu, lead, microsoft, vdolive, vivo, xirlink </entry>
|
|
<entry>
|
|
Vendor specific variant of the format. 'itu' is the standard.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>h263version</entry>
|
|
<entry>string</entry>
|
|
<entry>h263, h263p, h263pp</entry>
|
|
<entry>
|
|
Enhanced versions of the h263 codec.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-h264</entry>
|
|
<entry>H-264 video.</entry>
|
|
<entry>variant</entry>
|
|
<entry>string</entry>
|
|
<entry>itu, videosoft</entry>
|
|
<entry>
|
|
Vendor specific variant of the format. 'itu' is the standard.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-huffyuv</entry>
|
|
<entry>Huffyuv video.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-indeo</entry>
|
|
<entry>Indeo video.</entry>
|
|
<entry>indeoversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>3</entry>
|
|
<entry>
|
|
Version of the Indeo codec used to encode this stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-intel-h263</entry>
|
|
<entry>H-263 video.</entry>
|
|
<entry>variant</entry>
|
|
<entry>string</entry>
|
|
<entry>intel</entry>
|
|
<entry>
|
|
Vendor specific variant of the format.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-jpeg</entry>
|
|
<entry>Motion-JPEG video.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type. Note that video/x-jpeg only applies to Motion-JPEG
|
|
pictures (YUY2 colourspace). RGB colourspace JPEG images are
|
|
referred to as image/jpeg (JPEG image).
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry morerows="1">video/mpeg</entry>
|
|
<entry morerows="1">MPEG video.</entry>
|
|
<entry>mpegversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1, 2 or 4</entry>
|
|
<entry>
|
|
Version of the MPEG codec that this stream was encoded with.
|
|
Note that we have different mimetypes for 3ivx, XviD, DivX and
|
|
"standard" ISO MPEG-4. This is <emphasis>not</emphasis> a good
|
|
thing and we're fully aware of this. However, we do not have a
|
|
solution yet.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>systemstream</entry>
|
|
<entry>boolean</entry>
|
|
<entry>FALSE</entry>
|
|
<entry>
|
|
Indicates that this stream is <emphasis>not</emphasis> a system
|
|
container stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-msmpeg</entry>
|
|
<entry>Microsoft MPEG-4 video deviations.</entry>
|
|
<entry>msmpegversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>41, 42 or 43</entry>
|
|
<entry>
|
|
Version of the MS-MPEG-4-like codec that was used to encode this
|
|
version. A value of 41 refers to MS MPEG 4.1, 42 to 4.2 and 43
|
|
to version 4.3.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-msvideocodec</entry>
|
|
<entry>Microsoft Video 1 (oldish codec).</entry>
|
|
<entry>msvideoversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1</entry>
|
|
<entry>
|
|
Version of the codec - always 1.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-pn-realvideo</entry>
|
|
<entry>Realmedia video.</entry>
|
|
<entry>rmversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1, 2 or 3</entry>
|
|
<entry>
|
|
Version of the Real Video codec that this stream was encoded
|
|
with.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry morerows="2">video/x-rle</entry>
|
|
<entry morerows="2">RLE animation format.</entry>
|
|
<entry>layout</entry>
|
|
<entry>string</entry>
|
|
<entry>"microsoft" or "quicktime"</entry>
|
|
<entry>
|
|
The RLE format inside the Microsoft AVI container has a
|
|
different byte layout than the RLE format inside Apple's
|
|
Quicktime container; this property keeps track of the
|
|
layout.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>depth</entry>
|
|
<entry>integer</entry>
|
|
<entry>1 to 64</entry>
|
|
<entry>
|
|
Bit depth of the used palette. This means that the palette
|
|
that belongs to this format defines 2^depth colors.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>palette_data</entry>
|
|
<entry>GstBuffer</entry>
|
|
<entry></entry>
|
|
<entry>
|
|
Buffer containing a color palette (in native-endian RGBA) used
|
|
by this format. The buffer is of size 4*2^depth.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-svq</entry>
|
|
<entry>Sorensen Video.</entry>
|
|
<entry>svqversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1 or 3</entry>
|
|
<entry>
|
|
Version of the Sorensen codec that the stream was encoded with.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-tarkin</entry>
|
|
<entry>Tarkin video.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-theora</entry>
|
|
<entry>Theora video.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-vp3</entry>
|
|
<entry>VP-3 video.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type. Note that we have different mimetypes for VP-3 and
|
|
Theora, which is not necessarily a good idea. This could probably
|
|
be improved.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-wmv</entry>
|
|
<entry>Windows Media Video</entry>
|
|
<entry>wmvversion</entry>
|
|
<entry>integer</entry>
|
|
<entry>1,2 or 3</entry>
|
|
<entry>
|
|
Version of the WMV codec that the stream was encoded with.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-xvid</entry>
|
|
<entry>XviD video.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ subtitle ############# -->
|
|
|
|
<row>
|
|
<entry spanname="fullwidth">
|
|
<emphasis>All image types.</emphasis>
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>image/gif</entry>
|
|
<entry>Graphics Interchange Format.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>image/jpeg</entry>
|
|
<entry>Joint Picture Expert Group Image.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type. Note that image/jpeg only applies to RGB-colourspace
|
|
JPEG images; YUY2-colourspace JPEG pictures are referred to as
|
|
video/x-jpeg ("Motion JPEG").
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>image/png</entry>
|
|
<entry>Portable Network Graphics Image.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>image/tiff</entry>
|
|
<entry>Tagged Image File Format.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table frame="all" id="table-container-types" xreflabel="Table of Container Types">
|
|
<title>Table of Container Types</title>
|
|
<tgroup cols="6" align="left" colsep="1" rowsep="1">
|
|
<colspec colnum="1" colname="colc1" colwidth="1*"/>
|
|
<colspec colnum="6" colname="colc6" colwidth="6*"/>
|
|
<spanspec spanname="fullwidth" namest="colc1" nameend="colc6"/>
|
|
|
|
<thead>
|
|
<row>
|
|
<entry>Mime Type</entry>
|
|
<entry>Description</entry>
|
|
<entry>Property</entry>
|
|
<entry>Property Type</entry>
|
|
<entry>Property Values</entry>
|
|
<entry>Property Description</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody valign="top">
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-ms-asf</entry>
|
|
<entry>Advanced Streaming Format (ASF).</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-msvideo</entry>
|
|
<entry>AVI.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-dv</entry>
|
|
<entry>Digital Video.</entry>
|
|
<entry>systemstream</entry>
|
|
<entry>boolean</entry>
|
|
<entry>TRUE</entry>
|
|
<entry>
|
|
Indicates that this is a container system stream rather than an
|
|
elementary video stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/x-matroska</entry>
|
|
<entry>Matroska.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/mpeg</entry>
|
|
<entry>Motion Pictures Expert Group System Stream.</entry>
|
|
<entry>systemstream</entry>
|
|
<entry>boolean</entry>
|
|
<entry>TRUE</entry>
|
|
<entry>
|
|
Indicates that this is a container system stream rather than an
|
|
elementary video stream.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>application/ogg</entry>
|
|
<entry>Ogg.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>video/quicktime</entry>
|
|
<entry>Quicktime.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>application/vnd.rn-realmedia</entry>
|
|
<entry>RealMedia.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry>audio/x-wav</entry>
|
|
<entry>WAV.</entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
There are currently no specific properties defined or needed for
|
|
this type.
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table frame="all" id="table-subtitle-types" xreflabel="Table of Subtitle Types">
|
|
<title>Table of Subtitle Types</title>
|
|
<tgroup cols="6" align="left" colsep="1" rowsep="1">
|
|
<colspec colnum="1" colname="colt1" colwidth="1*"/>
|
|
<colspec colnum="6" colname="colt6" colwidth="6*"/>
|
|
<spanspec spanname="fullwidth" namest="colt1" nameend="colt6"/>
|
|
|
|
<thead>
|
|
<row>
|
|
<entry>Mime Type</entry>
|
|
<entry>Description</entry>
|
|
<entry>Property</entry>
|
|
<entry>Property Type</entry>
|
|
<entry>Property Values</entry>
|
|
<entry>Property Description</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody valign="top">
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
None defined yet.
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table frame="all" id="table-other-types" xreflabel="Table of Other Types">
|
|
<title>Table of Other Types</title>
|
|
<tgroup cols="6" align="left" colsep="1" rowsep="1">
|
|
<colspec colnum="1" colname="colo1" colwidth="1*"/>
|
|
<colspec colnum="6" colname="colo6" colwidth="6*"/>
|
|
<spanspec spanname="fullwidth" namest="colo1" nameend="colo6"/>
|
|
|
|
<thead>
|
|
<row>
|
|
<entry>Mime Type</entry>
|
|
<entry>Description</entry>
|
|
<entry>Property</entry>
|
|
<entry>Property Type</entry>
|
|
<entry>Property Values</entry>
|
|
<entry>Property Description</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody valign="top">
|
|
|
|
<!-- ############ type ############# -->
|
|
|
|
<row>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry></entry>
|
|
<entry>
|
|
None defined yet.
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
</sect1>
|
|
</chapter>
|