On 06 Feb 2014, at 22:37, Tim Walker <[email protected]> wrote:
> ---
>
> This is pretty AC3-centric, but using abosulte scale factors rather than dB
> levels (or worse, indexes/codes) should make it compatible with other codecs
> should they implement a similar kind of downmix metadata.
>
> Justin suggested making even more codec-agnostic by using flags to indicate
> the precense or absence of certain fields, but I'm unsure as to how this could
> be implemented. Any ides or examples?
>
> doc/APIchanges | 4 ++++
> libavutil/Makefile | 2 ++
> libavutil/frame.h | 5 +++++
> libavutil/version.h | 2 +-
> 4 files changed, 12 insertions(+), 1 deletion(-)
Ping.
Still unsure on how to use flags with this. Something like:
if (flags & LTRT_SOME_FLAG)
{
// center_mix_level_ltrt, surround_mix_level_ltrt are set and can be used
}
else
{
// ignore center_mix_level_ltrt, surround_mix_level_ltrt, they are unset
// please use your own defaults
}
…seems a bit silly, when the fields can just be set to a sane default (which
may be specified in the spec., e.g. A/52). But YMMV.
Any opinions or ideas, or should this be left as-is?
I'd like it if this could make the cut for libav10.
Tim
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