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Merged
beaufortfrancois merged 2 commits into from
Jun 1, 2017
Merged

Add VP9 codec string sample #517

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7ebe152
Add VP9 codec string sample
beaufortfrancois May 29, 2017
9d0d00e
Address @chcunningham feedback
beaufortfrancois May 31, 2017
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33 changes: 33 additions & 0 deletions media/vp9-codec-string.html
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---
feature_name: New VP9 codec string and Profile 2 support
chrome_version: 60
feature_id: 6230726177456128
check_min_version: true
---

<h3>Background</h3>
<p>
VP9 is an open and royalty-free video codec that has been supported in Chromium
since 2013. An update adds <a href="https://www.webmproject.org/vp9/mp4/">a new
string format</a> for describing the encoding properties, such as the profile,
level, etc. Such properties are common in video codecs but are not exposed in
the current VP9 string format.
<p>
</p>
In addition, this update includes a new format to advertise support for VP9
Profile 2. This profile is needed to enable higher bit-depth video and the new
binding allows higher granularity in the query for specific features of the VP9
bitstream. The string format is accepted by media-related APIs such as
<code>MediaSource.isTypeSupported()</code>, <code>HTMLMediaElement.canPlayType()</code>, and
<code>navigator.requestMediaKeySystemAccess()</code>.
</p>

{% include output_helper.html %}

<script>
log = ChromeSamples.log;
log('Your browser supports:');
</script>

{% include js_snippet.html filename='vp9-codec-string.js' %}

28 changes: 28 additions & 0 deletions media/vp9-codec-string.js
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if (MediaSource.isTypeSupported('video/webm; codecs="vp9"')) {
log('> Some VP9 profile');
}

if (MediaSource.isTypeSupported('video/webm; codecs="vp09.00.10.08"')) {
log('> VP9, Profile 0, level 1, bit depth 8 (later fields defaulted)');
}

if (MediaSource.isTypeSupported('video/webm; codecs="vp09.01.20.08.01"')) {
log('> VP9, Profile 1, level 2, bit depth 8, ' +
'4:2:0 chroma subsampling colocated with (0,0) luma, ' +
'(later fields defaulted)');
}

if (MediaSource.isTypeSupported('video/webm; codecs="vp09.01.20.08.01.01.01.01.00"')) {
log('> VP9, Profile 1, level 2, bit depth 8, ' +
'4:2:0 chroma subsampling colocated with (0,0) luma, ' +
'REC709 color/transfer/matrix, ' +
'luma/chroma encoded in the "legal" range.');
}

if (MediaSource.isTypeSupported('video/webm; codecs="vp09.02.10.10.01.09.16.09.01"')) {
log('> VP9, Profile 2, level 1, 10-bit YUV content, ' +
'4:2:0 colocated with luma (0,0) chroma subsampling, ' +
'ITU-R BT.2020 primaries, ' +
'ST 2084 EOTF, ITU-R BT.2020 non-constant luminance color matrix, ' +
'full-range chroma/luma encoding.');
}