alaw_codec_registration.src.html

<pre class='metadata'>
Title: A-law PCM WebCodecs Registration
Repository: w3c/webcodecs
Status: NOTE-ED
Shortname: webcodecs-alaw-codec-registration
Level: none
Group: mediawg
ED: https://w3c.github.io/webcodecs/alaw_codec_registration.html
TR: https://www.w3.org/TR/webcodecs-alaw-codec-registration/
Editor: Paul Adenot, w3cid 62410, Mozilla https://www.mozilla.org/
Editor: Bernard Aboba, w3cid 65611, Microsoft Corporation https://www.microsoft.com/
Former Editor: Chris Cunningham, w3cid 114832, Google Inc. https://www.google.com/

Abstract: This registration is entered into the [[webcodecs-codec-registry]].
    It describes, for A-law encoded PCM, the (1) fully qualified codec strings,
    (2) the codec-specific {{EncodedAudioChunk}}
    {{EncodedAudioChunk/[[internal data]]}} bytes, (3) the
    {{AudioDecoderConfig/description|AudioDecoderConfig.description}},
    and (4) the values of {{EncodedAudioChunk}} {{EncodedAudioChunk/[[type]]}}.

    The registration is not intended to include any information on whether a
    codec format is encumbered by intellectual property claims. Implementers and
    authors are advised to seek appropriate legal counsel in this matter if they
    intend to implement or use a specific codec format. Implementers of
    WebCodecs are not required to support the A-law PCM codec.

    This registration is non-normative.

Markup Shorthands:css no, markdown yes, dfn yes
!Participate: <a href="https://github.com/w3c/webcodecs">Git Repository.</a>
!Participate: <a href="https://github.com/w3c/webcodecs/issues/new">File an issue.</a>
!Version History: <a href="https://github.com/w3c/webcodecs/commits">https://github.com/w3c/webcodecs/commits</a>
</pre>

<pre class='biblio'>
{
  "ITU-G.711": {
    "href": "https://www.itu.int/rec/T-REC-G.711/",
    "title": "G.711 : Pulse code modulation (PCM) of voice frequencies",
    "publisher": "ITU",
    "date": "November 1988"
  }
}
</pre>

Fully qualified codec strings {#fully-qualified-codec-strings}
==============================================================

The codec string is `"alaw"`.

EncodedAudioChunk data {#encodedaudiochunk-data}
================================================

{{EncodedAudioChunk}} {{EncodedAudioChunk/[[internal data]]}} is expected to be
a sequence of bytes of arbitrary length, where each byte is an A-law
encoded PCM sample as defined by Tables 1a and 1b in [[ITU-G.711]].

AudioDecoderConfig description {#audiodecoderconfig-description}
================================================================

The {{AudioDecoderConfig/description}} is expected to be omitted from the
{{AudioDecoderConfig}}.

EncodedAudioChunk type {#encodedaudiochunk-type}
================================================

The {{EncodedAudioChunk/[[type]]}} for an {{EncodedAudioChunk}} containing
A-law PCM is always "{{EncodedAudioChunkType/key}}".

Privacy Considerations {#privacy-considerations}
==========================================================================

Please refer to the section [[WEBCODECS#privacy-considerations|Privacy
Considerations]] in [[WEBCODECS]].

Security Considerations {#security-considerations}
==========================================================================

Please refer to the section [[WEBCODECS#security-considerations|Security
Considerations]] in [[WEBCODECS]].