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Addresses editorial feedback from Yannis, Maryla, and Thomas #61

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Addresses editorial feedback from Yannis, Maryla, and Thomas #61

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73e7cb8
will -> shall
podborski Mar 25, 2026
b7b26b5
hex code fix
podborski Mar 25, 2026
0188fbc
attempt on HDR definition rewrite based on the feedback
podborski Mar 26, 2026
1090a21
remove redundant date
podborski Mar 26, 2026
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30 changes: 20 additions & 10 deletions index.bs
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Expand Up @@ -26,22 +26,32 @@ Max ToC Depth: 3
"publisher": "ISO"
},
"BT-1886": {
"title": "Recommendation BT.1886 : Reference electro-optical transfer function for flat panel displays used in HDTV studio production",
"title": "Recommendation ITU-R BT.1886-0, Reference electro-optical transfer function for flat panel displays used in HDTV studio production",
"href": "https://www.itu.int/rec/R-REC-BT.1886",
"status": "Recommendation",
"publisher": "ITU"
"publisher": "ITU",
"date": "2011"
},
"BT-709": {
"title": "Recommendation BT.709 : Parameter values for the HDTV standards for production and international programme exchange",
"title": "Recommendation ITU-R BT.709-6, Parameter values for the HDTV standards for production and international programme exchange",
"href": "https://www.itu.int/rec/R-REC-BT.709",
"status": "Recommendation",
"publisher": "ITU"
"publisher": "ITU",
"date": "2015"
},
"BT-2100": {
"title": "Recommendation ITU-R BT.2100-2, Image parameter values for high dynamic range television for use in production and international programme exchange",
"href": "https://www.itu.int/rec/R-REC-BT.2100",
"status": "Recommendation",
"publisher": "ITU",
"date": "2018"
},
"BT-2020": {
"title": "Recommendation BT.2020 : Parameter values for ultra-high definition television systems for production and international programme exchange",
"title": "Recommendation ITU-R BT.2020-2, Parameter values for ultra-high definition television systems for production and international programme exchange",
"href": "https://www.itu.int/rec/R-REC-BT.2020",
"status": "Recommendation",
"publisher": "ITU"
"publisher": "ITU",
"date": "2015"
}
}
</pre>
Expand Down Expand Up @@ -208,7 +218,7 @@ AV1_video_descriptor() {

<b><code>seq_tier_0</code></b>, <b><code>twelve_bit</code></b>, <b><code>monochrome</code></b>, <b><code>chroma_subsampling_x</code></b>, <b><code>chroma_subsampling_y</code></b>, <b><code>chroma_sample_position</code></b> - These fields shall be coded according to the same semantics when they are present. If they are not present, they will be coded using the value inferred by the semantics.

<b><code>hdr_wcg_idc</code></b> - The value of this syntax element indicates the presence or absence of high dynamic range (HDR) and/or wide color gamut (WCG) video components in the associated PID according to the table below. HDR is defined to be video that has high dynamic range if the video stream EOTF is higher than the reference EOTF defined in [[!BT-1886]]. WCG is defined to be video that is coded using colour primaries with a colour gamut not contained within [[!BT-709]].
<b><code>hdr_wcg_idc</code></b> - The value of this syntax element indicates the presence or absence of high dynamic range (HDR) and/or wide color gamut (WCG) video components in the associated PID according to the table below. HDR is defined to be video that uses an HDR transfer function, such as those defined in [[!BT-2100]] (PQ or HLG). WCG is defined to be video that is coded using colour primaries with a colour gamut not contained within [[!BT-709]].

<table class="spec-table">
<thead>
Expand All @@ -227,15 +237,15 @@ AV1_video_descriptor() {
</tr>
<tr>
<td align="center">2</td>
<td align="left">Both HDR and WCG are to be indicated in the stream</td>
<td align="left">The video stream is both HDR and WCG</td>
</tr>
<tr>
<td align="center">3</td>
<td align="left">No indication made regarding HDR/WCG or SDR characteristics of the stream</td>
</tr>
</tbody></table>

<b><code>reserved_zeros</code></b> - Will be set to zeroes.
<b><code>reserved_zeros</code></b> - Shall be set to zeroes.

<b><code>initial_presentation_delay_present</code></b> - Indicates <b><code>initial_presentation_delay_minus_one</code></b> field is present.

Expand Down Expand Up @@ -276,7 +286,7 @@ Prior to carriage into PES, the AV1 <b><code>open_bitstream_unit()</code></b> is

```cpp
ts_open_bitstream_unit(NumBytesInTsObu) {
uimsbf(24) obu_start_code; /* equal to 0x01 */
uimsbf(24) obu_start_code; /* equal to 0x000001 */
NumBytesInObu = 0
for( i = 2; i < NumBytesInTsObu; i++ ) {
if( i + 2 < NumBytesInTsObu && nextbits(24) == 0x000003 ) {
Expand Down
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