[flac-dev] WAVEFORMATEXTENSIBLE_CHANNEL_MASK is not described

[Federico Miyara]

Martin,

Are you sure you are looking for ITU-R BR./138/?

I've found ITU-R BR.1384-2 that starts with the same digits and deals 
with the same subject. Please see if it is this one, which has 4, 8 and 
12 channels:

https://www.itu.int/dms_pubrec/itu-r/rec/br/R-REC-BR.1384-2-201103-I!!PDF-E.pdf 
<https://www.itu.int/dms_pubrec/itu-r/rec/br/R-REC-BR.1384-2-201103-I%21%21PDF-E.pdf>

Part 1,

https://www.itu.int/dms_pubrec/itu-r/rec/br/R-REC-BR.1384-1-200504-S!!PDF-E.pdf 
<https://www.itu.int/dms_pubrec/itu-r/rec/br/R-REC-BR.1384-1-200504-S%21%21PDF-E.pdf>

is also available but it has been superseded by the former.

Regards,

Feedrico

On 23/07/2015 14:04, Martin Leese wrote:
> On 7/16/15, Martin Leese <martin.leese at stanfordalumni.org> wrote:
>
>> Martijn van Beurden wrote:
>>> I would propose: 0000-0111 : (number of independent channels)-1.
>>> The channel order is defined through the
>>> WAVEFORMATEXTENSIBLE_CHANNEL_MASK vorbis comment, if defined. If
>>> no WAVEFORMATEXTENSIBLE_CHANNEL_MASK is present, the channel
>>> order follows SMPTE/ITU-R recommendations, which are as follows:
>> This looks like an excellent proposal.
> I tried to find the specific SMPTE/ITU-R
> recommendation on channel order.  I found a
> reference to "ITU-R BR.138", but this is not
> available from the ITU-R Recommendations
> website.  Does anybody have a copy of this?
>
> I found lots of places which state the
> SMPTE/ITU-R recommendation on channel
> order.  But all these are only for 5.1, and
> are the usual front left, front right, front center,
> LFE, surround left, surround right.  I therefore
> suspect the SMPTE/ITU-R recommendation is
> only for 5.1.
>
> With this in mind, I now propose the following
> wording in the FLAC spec:
> 0000-0111 : (number of independent channels)-1. The channel assignment
> and order is defined through the WAVEFORMATEXTENSIBLE_CHANNEL_MASK
> FLAC tag. If no WAVEFORMATEXTENSIBLE_CHANNEL_MASK is present, the
> channel assignment and order follow SMPTE/ITU-R recommendations (where
> defined) and are as follows:
>
> Regards,
> Martin

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