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Added many more details about types.

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Original commit message from CVS:
Added many more details about types.
This commit is contained in:
Richard Boulton 2001-03-18 05:21:47 +00:00
parent d5c2bc5f98
commit 5ee51757d1
1 changed files with 83 additions and 7 deletions
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90
docs/fwg/gst-plugin-writers-guide.sgml
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@ -288,15 +288,13 @@
mu law, 2 for A law.
</para><para>
<emphasis>endianness</emphasis>
- The order of bytes in a sample. This is an integer for
which there are two valid values: 0 for little-endian (ie, bytes
are least significant first), 1 for big-endian (ie, most
significant byte first).
- The order of bytes in a sample. This is a boolean:
0 means little-endian (ie, bytes are least significant first),
1 means big-endian (ie, most significant byte first).
</para><para>
<emphasis>signed</emphasis>
- Whether the samples are signed or not. This is an integer
for which there are two valid values: 0 for unsigned, 1 for
signed.
- Whether the samples are signed or not. This is a boolean:
0 means unsigned, 1 means signed.
</para><para>
<emphasis>width</emphasis>
- The number of bits per sample. This is extremely likely to be
@ -327,6 +325,84 @@
<listitem>
<para>
<emphasis>audio/mp3</emphasis>
- Audio data compressed using the mp3 encoding scheme.
</para><para>
<emphasis>framed</emphasis>
- This is a boolean. If true (1), each buffer contains exactly
one frame. If false (0), frames and buffers do not (necessarily)
match up. If the data is not framed, the values of some of the
properties will not be available, but others will be assumed to
be constant throughout the file, or may be found in other ways.
</para><para>
<emphasis>layer</emphasis>
- The compression scheme layer used to compress the data.
This is an integer, and can currently have the value 1, 2
or 3.
</para><para>
<emphasis>bitrate</emphasis>
- The bitrate, in kilobits per second.
For VBR (variable bitrate) mp3 data, this is the average bitrate.
</para><para>
<emphasis>channels</emphasis>
- The number of channels of audio data present. This could
theoretically be any integer greater than 0, but in practice will
be either 1 or 2.
</para><para>
<emphasis>joint-stereo</emphasis>
- Boolean. If true, channels must not be zero. If true, this
implies that stereo data is stored as a combined signal and
the difference between the signals, rather than as two entirely
separate signals.
</para><para>
There are many other properties relevant for
<emphasis>audio/mp3</emphasis> data: these may be added to this
specification at a later date.
</para>
</listitem>
</itemizedlist>
<itemizedlist>
<listitem>
<para>
<emphasis>audio/x-ogg</emphasis>
- Audio data compressed using the Ogg Vorbis encoding scheme.
There are currently no parameters defined for this type. FIXME.
</para>
</listitem>
</itemizedlist>
<itemizedlist>
<listitem>
<para>
<emphasis>video/raw</emphasis>
- Raw video data.
</para><para>
<emphasis>fourcc</emphasis>
</para><para>
<emphasis>width</emphasis>
- The number of pixels wide that each video frame is.
</para><para>
<emphasis>height</emphasis>
- The number of pixels high that each video frame is.
</para>
</listitem>
</itemizedlist>
<itemizedlist>
<listitem>
<para>
<emphasis>video/mpeg</emphasis>
- Video data compressed using an mpeg encoding scheme.
</para><para>
<emphasis>mpegversion</emphasis>
</para><para>
<emphasis>systemstream</emphasis>
</para>
</listitem>
</itemizedlist>
<itemizedlist>
<listitem>
<para>
<emphasis>video/avi</emphasis>
- Video data compressed using the AVI encoding scheme.
There are currently no parameters defined for this type. FIXME.
</para>
</listitem>
</itemizedlist>