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44 changes: 35 additions & 9 deletions index.html
Original file line number Diff line number Diff line change
Expand Up @@ -224,8 +224,8 @@ <h3>Edit script to match performance: <dfn data-lt="PS5">Process Step 5</dfn>. <
<section>
<h2>Requirements</h2>
<p>The following table lists the requirements at each stage of the workflow:</p>
<p class="ednote">TODO: Add [[media-accessibility-reqs]]</p>
<table class="simple">

<table class="data">
<caption>Table of requirements, each having a unique requirement number,
links to the workflow process stages from which it arises,
and a detailed description.</caption>
Expand Down Expand Up @@ -260,13 +260,23 @@ <h2>Requirements</h2>
either matching a dialogue spoken by a single character or matching on-screen text from the programme,
or that is an opportunity for adding descriptions.</p>
<p class="note">Within a <a>script event</a>, there may be other timed content, whose times are relative to the beginning of the script event.</p>
<p>[[media-accessibility-reqs]] DV-2 Render descriptions in a time-synchronized manner, using the primary media resource as the timebase master.</p>
</td>
</tr>
<tr>
<td>R3</td>
<td><a>PS2a</a></td>
<td><p>A document must be able to incorporate description text to be voiced,
each description located within a timed interval defined by a begin time and an end time.</p></td>
each description located within a timed interval defined by a begin time and an end time.</p>
<div>[[media-accessibility-reqs]] TVD-2 TVDs need to be provided in a format that contains the following information:
<ol type="a">
<li>start time, text per description cue (the duration is determined dynamically, though an end time could provide a cut point)</li>
<li>possibly a speech-synthesis markup to improve quality of the description (existing speech synthesis markups include SSML ([[speech-synthesis11]]) and CSS 3 Speech Module ([[css-speech-1]]))</li>
<li>accompanying metadata providing labeling for speakers, language, etc. and</li>
<li>visual style markup.</li>
</ol>
</div>
</td>
</tr>
<tr>
<td>R4</td>
Expand All @@ -287,7 +297,10 @@ <h2>Requirements</h2>
what gender and age voice would be appropriate to voice the descriptions;
it is also feasible to include data used to improve the quality of text to speech synthesis,
such as phonetic descriptions of the text, intonation and emotion data etc.
The format of any extensions for this purpose need not be defined.</p></td>
The format of any extensions for this purpose need not be defined.</p>
<p>[[media-accessibility-reqs]] DV-10 Allow the user to select from among different languages of descriptions, if available, even if they are different from the language of the main soundtrack.</p>
<p>[[media-accessibility-reqs]] DV-13 Support metadata, such as copyright information, usage rights, language, etc.</p>
</td>
</tr>
<tr>
<td>R6</td>
Expand Down Expand Up @@ -356,30 +369,39 @@ <h2>Requirements</h2>
<td><a>PS3</a></td>
<td><p>A document must be able to reference audio tracks either
included as binary data within the document
or separately.</p></td>
or separately.</p>
<p>[[media-accessibility-reqs]] DV-4 Support recordings of high quality speech as a track of the media resource, or as an external file.</p>
<p>[[media-accessibility-reqs]] DV-9 Allow the author to use a codec which is optimized for voice only, rather than requiring the same codec as the original soundtrack.</p>
</td>
</tr>
<tr>
<td>R16</td>
<td><a>PS3</a></td>
<td><p>A document must be able to associate a begin time
with the beginning of playback of each audio track,
for the case that multiple audio tracks are created,
one per description.</p></td>
one per description.</p>
<p>[[media-accessibility-reqs]] DV-2 Render descriptions in a time-synchronized manner, using the primary media resource as the timebase master.</p>
</td>
</tr>
<tr>
<td>R17</td>
<td><a>PS3</a></td>
<td><p>A document must be able to associate a begin time with a playback entry time
within an audio track,
for the case that a single audio track is generated
that contains multiple segments of audio to be played back at different times.</p></td>
that contains multiple segments of audio to be played back at different times.</p>
<p>[[media-accessibility-reqs]] DV-2 Render descriptions in a time-synchronized manner, using the primary media resource as the timebase master.</p>
</td>
</tr>
<tr>
<td>R18</td>
<td><a>PS4</a></td>
<td><p>A document must be able to associate a left/right pan value
with playback of each or every audio description.
This value applies to the audio description prior to mixing with the main programme audio.</p></td>
This value applies to the audio description prior to mixing with the main programme audio.</p>
<p>[[media-accessibility-reqs]] DV-8 Allow the author to provide fade and pan controls to be accurately synchronized with the original soundtrack.</p>
</td>
</tr>
<tr>
<td>R19</td>
Expand All @@ -388,7 +410,11 @@ <h2>Requirements</h2>
that applies to the main programme audio prior to mixing with the audio description,
where that fade level curve is defined by
a set of pairs of level and times
and an interpolation algorithm.</p></td>
and an interpolation algorithm.</p>
<p>[[media-accessibility-reqs]] DV-5 Allow the author to independently adjust the volumes of the audio description and original soundtracks where these are available as separate audio channel resources.</p>
<p>[[media-accessibility-reqs]] DV-7 Permit smooth changes in volume rather than stepped changes. The degree and speed of volume change should be under user control.</p>
<p>[[media-accessibility-reqs]] DV-8 Allow the author to provide fade and pan controls to be accurately synchronized with the original soundtrack.</p>
</td>
</tr>
<tr>
<td>R20</td>
Expand Down