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