Skip to content

Commit

Permalink
Removed tile media type parameter for transmitting multi-tile images …
Browse files Browse the repository at this point in the history 
…as multiple single tile images
  • Loading branch information
@palemieux
palemieux authored Jul 17, 2024
1 parent a5ad3f3 commit 11dbf07
Showing 1 changed file with 15 additions and 273 deletions.
288 changes: 15 additions & 273 deletions draft-ietf-avtcore-rtp-j2k-scl-01.xml
View file
Original file line number Diff line number Diff line change
Expand Up @@ -137,10 +137,6 @@ docName="draft-ietf-avtcore-rtp-j2k-scl-01" xml:lang="en" version="3">
can be further divided into contiguous rectangular tiles that are each
independently coded and decoded.</t>

<t>NOTE: This payload format allows the transmission of multi-tile images
as multiple single-tile images per stream, as specified at <xref
target="sec-mt-images"/>.</t>

<t>JPEG 2000 codes each image as a standalone codestream. Each codestream
consists of (i) marker segments, which contain coding parameters and
metadata, and (ii) coded data.</t>
Expand Down Expand Up @@ -817,76 +813,6 @@ Packets | Main | Body | ... | Body | Main ...
decomposition.</t>
</section>

<section anchor="sec-mt-images">
<name>Transmitting multi-tile images as multiple single-tile images</name>

<t>A sequence of multi-tile images can be transmitted by splitting it
into multiple sequences of single-tile images, where:</t>

<ul>
<li>each sequence of single-tile images corresponds to a unique tile
of the multi-tile image;</li>
<li>each sequence of single-tile images is transmitted in a separate
RTP stream;</li>
<li>the coordinates of each single-tile image are expressed using the
coordinate system of the multi-tile image; and</li>
<li>the bitstreams of each of each single-tile image are identical to
the corresponding bitstreams in the multi-tile image.</li>
</ul>

<t>Such sequences of single-tile images are identified using the
<tt>tile</tt> media type parameter specified at <xref
target="dt-tile"/>.</t>

<t><xref target="fig-multi-tile-splitting"/> illustrates this
process.</t>

<figure anchor="fig-multi-tile-splitting">
<name>Illustration of the process of transmitting a multi-tile image
sequence as two single-tile image sequences, each in its own RTP
stream.</name>
<artwork type="ascii-art">
<![CDATA[
(a) Multi-tile image
<- Header -> <- Tile #0 -> <- Tile #1 ->
| | | |
+-----+-----+-----+-------+-----+-------+-----+
| SOC | ... | SOT | .(1). | SOT | .(2). | EOC |
+-----+-----+-----+-------+-----+-------+-----+
(1) data for Tile #0
(2) data for Tile #1
(b) Resulting two single-tile images each in its own RTP stream
"tile" parameter of the media type
associated with the RTP stream
RTP stream #1
<- Header -> <- Tile #0 ->
| | |
+-----+-----+-----+-------+-----+
| SOC | ... | SOT | .(1). | EOC | tile=0&amp;00000190000000c80000\
+-----+-----+-----+-------+-----+ 00c800000000000000c8000000\
c8000000640000000000010800\
00
RTP stream #2
<- Header -> <- Tile #0 ->
| | |
+-----+-----+-----+-------+-----+
| SOC | ... | SOT | .(2). | EOC | tile=1&amp;00000190000000c80000\
+-----+-----+-----+-------+-----+ 00c800000000000000c8000000\
c8000000640000000000010800\
00
]]>
</artwork>
</figure>

</section>
</section>


Expand Down Expand Up @@ -928,9 +854,7 @@ Packets | Main | Body | ... | Body | Main ...

<t>NOTE: Resync points cannot be specified if the codestream consists of
more than one tile (<tt>ORDB</tt> and <tt>ORDH</tt> are both equal to
zero). To transmit codestreams that consist of more than one tile and
benefit from resync points, the technique specified at <xref
target="sec-mt-images"/> can be used.</t>
zero).</t>

<t>NOTE: A resync point can be used by a receiver to process a
codestream even if earlier packets in the codestream have been
Expand Down Expand Up @@ -1415,197 +1339,6 @@ Packets | Main | Body | ... | Body | Main ...
specified in this document, are unspecified.</t>
</dd>

<dt anchor="dt-tile"><tt>tile</tt></dt>
<dd>
<t>The parameter MUST conform to the <tt>tile</tt> syntax
expressed using ABNF (<xref target="RFC5234"/>):</t>
<sourcecode type="abnf">
<![CDATA[
tile = tile-index "&" image-siz
tile-index = %x31-39 *%x30-39
image-siz = 1*HEXDIG
]]>
</sourcecode>

<t>If the <tt>tile</tt> parameter is present, each image MUST
correspond to one tile of a multi-tile image, as defined in
<xref target="sec-mt-images"/>.</t>

<t><tt>tile-index</tt> is the index of the tile in the
multi-tile image.</t>

<t><tt>image-siz</tt> contains the <tt>SIZ</tt> marker segment
parameters of the multi-tile image, encoded as a case
insensitive hexadecimal string.</t>

<t>The <tt>SIZ</tt> parameters of each single-tile image MUST
conform to the following:</t>

<ul>
<li><tt>Xsiz</tt> MUST be equal to the smaller of (i) the
coordinate of the right edge of tile index
<tt>tile-index</tt> in the multi-tile image and (ii)
<tt>Xsiz</tt> of the multi-tile image.</li>

<li><tt>Ysiz</tt> MUST be equal to the smaller of (i) the
coordinate of the bottom edge of tile index
<tt>tile-index</tt> in the multi-tile image and (ii)
<tt>Ysiz</tt> of the multi-tile image.</li>

<li><tt>XOsiz</tt> MUST be equal to the larger of (i) the
coordinate of the left edge of tile index
<tt>tile-index</tt> in the multi-tile image and (ii)
<tt>XOsiz</tt> of the multi-tile image.</li>

<li><tt>YOsiz</tt> MUST be equal to the larger of (i) the
coordinate of the top edge of tile index
<tt>tile-index</tt> in the multi-tile image and (ii)
<tt>YOsiz</tt> of the multi-tile image.</li>

<li><tt>XTOsiz</tt> MUST be equal to the coordinate of the
left edge of tile index <tt>tile-index</tt> in the multi-tile
image.</li>

<li><tt>YTOsiz</tt> MUST be equal to the coordinate of the top
edge of tile index <tt>tile-index</tt> in the multi-tile
image.</li>

<li>All other parameters MUST be equal to that in the
multi-tile image.</li>
</ul>

<t><xref target="fig-multi-tile-diagram"/> illustrates an
example where a multi-tile image that consists of two tiles is
transmitted as two single-tile images (images 1 and 2). <xref
target="fig-multi-tile-parameter-example"/> and <xref
target="t-mt-example"/> describe the <tt>tile</tt> and
<tt>SIZ</tt> parameter values, respectively.</t>

<figure anchor="fig-multi-tile-diagram">
<name>Ssiz parameters for a multi-tile image and two
corresponding single-tile images 1 and 2.</name>
<artwork type="ascii-art">
<![CDATA[
(a) Multi-tile image
<----------Xsiz---------->
<----> XTOSiz
+------------------------+
| <---Xtsiz----> |
| xxxxxxxxxxxxxxxxxxxxxxxxxxx
| x T0 x T1 | x
| x #######x####### x
| x #......x......# x
| x #......x......# x
+----xxxxxxxxxxxxxxxxxxxxxxxxxxx
<---XOsiz-->
(b) Single-tile image 1
<-------Xsiz------> +--+
<----> XTOSiz | | Reference grid
+-----------------+ +--+
| <---Xtsiz---->
| xxxxxxxxxxxxxx xxxx
| x T0 x x x Tile area
| x #######x xxxx
| x #......x
| x #......x ####
+----xxxxxxxxxxxxxx #..# Image area
<---XOsiz--> ####
(a) Single-tile image 2
<----------Xsiz---------->
<-----XTOSiz------>
+------------------------+
| |
| xxxxxxxxxxxxx
| x T0 | x
| x####### x
| x......# x
| x......# x
+-----------------xxxxxxxxxxxxx
<-------XOsiz-----X---Xtsiz--->
]]>
</artwork>
</figure>

<figure anchor="fig-multi-tile-parameter-example">
<name>Example <tt>tile</tt> parameter for a multi-tile image that consists of two tiles.</name>
<artwork type="ascii-art">
NOTE: '\' line wrapping per RFC 8792

tile=0&amp;00000190000000c8000000c800000000000000\
c8000000c800000064000000000001080000
</artwork>
</figure>

<table anchor="t-mt-example">
<name>Selected <tt>SIZ</tt> parameters for a two-tile image
and two corresponding single-time images.</name>
<thead>
<tr>
<th><tt>SIZ</tt> parameter</th>
<th>Two-tile image</th>
<th>Image where <tt>tile-index</tt> = 1</th>
<th>Image where <tt>tile-index</tt> = 2</th>
</tr>
</thead>
<tbody>
<tr>
<td>XSiz</td>
<td>400</td>
<td>300</td>
<td>400</td>
</tr>
<tr>
<td>YSiz</td>
<td>200</td>
<td>200</td>
<td>200</td>
</tr>
<tr>
<td>XTSiz</td>
<td>200</td>
<td>200</td>
<td>200</td>
</tr>
<tr>
<td>YTSiz</td>
<td>200</td>
<td>200</td>
<td>200</td>
</tr>
<tr>
<td>XOSiz</td>
<td>200</td>
<td>200</td>
<td>300</td>
</tr>
<tr>
<td>YOSiz</td>
<td>0</td>
<td>0</td>
<td>0</td>
</tr>
<tr>
<td>XTOSiz</td>
<td>100</td>
<td>100</td>
<td>300</td>
</tr>
<tr>
<td>YTOSiz</td>
<td>0</td>
<td>0</td>
<td>0</td>
</tr>
</tbody>
</table>

</dd>

<dt><tt>cache</tt></dt>
<dd>
<t>The value of the parameter MUST be either <tt>false</tt> or
Expand Down Expand Up @@ -1998,15 +1731,24 @@ c8000000c800000064000000000001080000
exhaustive.</t>
</section>

<section anchor="sec-soc-draft-ietf-avtcore-rtp-j2k-scl-01">
<name>Changes from <tt>draft-ietf-avtcore-rtp-j2k-scl-01</tt></name>
<section anchor="sec-soc-draft-ietf-avtcore-rtp-j2k-scl-00">
<name>Changes from <tt>draft-ietf-avtcore-rtp-j2k-scl-00</tt></name>

<ul>
<li>Allow multi-tile images in a single stream, in addition to
allowing multi-tile images to be transmitted as multiple single-tile
streams, as specified at <xref target="sec-mt-images"></xref>.</li>
<li>Fix incorrect <tt>TRANS</tt> values at <xref
target="t-pix-fmts"></xref>.</li>
streams.</li>
<li>Fix incorrect <tt>TRANS</tt> values.</li>
</ul>
</section>

<section anchor="sec-soc-draft-ietf-avtcore-rtp-j2k-scl-01">
<name>Changes from <tt>draft-ietf-avtcore-rtp-j2k-scl-01</tt></name>

<ul>
<li>Removed signalling for the transmission of multi-tile images as
multiple single-tile image streams (the <tt>tile</tt> media type
parameter).</li>
</ul>
</section>
</section>
Expand Down

0 comments on commit 11dbf07

Please sign in to comment.