[pulseaudio-discuss] [PATCH 2/4] Add A2DP AAC codec support

Huang-Huang Bao eh5 at sokka.cn
Thu Dec 20 05:18:06 UTC 2018

On 12/20/18 1:09 AM, Pali Rohár wrote:
> On Thursday 13 December 2018 19:43:37 EHfive wrote:
>> Optional (build with --disable-bluez5-aac-codec)
>> AAC User Configurations:
>>    KEY                 VALUE    DESC                                      DEFAULT
>>    aac_bitrate_mode    [1, 5]   Variable Bitrate (VBR) (encoder)          5
>>                        0        Constant Bitrate (CBR) (encoder)
>>    aac_fmt             s16      16-bit signed LE (encoder)                auto
>>                        s32      32-bit signed LE (encoder)
>>                        auto
>>    aac_afterburner     <on/off> FDK-AAC afterburner feature (encoder)     on
> In my opinion, support for AAC make sense only in passthrough mode. E.g.
> when your music files are already stored in AAC and you have headset
> with AAC support; and you do not want to re-encode it twice.

I think if we have high enough sample rate and bit depth, decode -
encode wouldn't cause sound quality loss.

> But I do not see support for passthrough mode in this patch. It is
> planned?

Not planned.

Besides, AAC here stands for AAC-LC, so not all AAC could do what you say.

> Maybe similar thing could be useful for MPEG1 A2DP audio codec (as lot
> of people listen MP3 files), but I have not seen headset with MPEG1
> support...

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