Hi Marcel, On Tue, Apr 24, 2018 at 10:01 AM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote: > Hi Luiz, > >>>> Legacy bluetooth codecs have a latency of ~200 ms or more, which creates >>>> a noticeable lag when watching videos or during voice calls. >>>> >>>> The AptX Low Latency (LL) codec can provide a stable connection with at >>>> most 40 ms of latency. >>>> >>>> - Is there a way to get AptX LL to work on Linux? >>>> - Are there alternatives for a low latency Bluetooth connection? >>> >>> with BlueZ for Android we actually had AptX working (given CSR provided you with a correct binary). >> >> There is a pretty old patch for PulseAudio that enables AptX: >> >> https://build.tizen.org/package/view_file/Tizen/pulseaudio/0020-add-bluetooth-a2dp-aptx-codec-support-samsung.patch?expand=1 >> >> It doesn't have the actual AptX library, which I guess cannot be >> distributed under the same license. We could perhaps have OPUS (which >> should perform quite well) instead which should be available in all >> distros already, that said no headset or phone would support it >> initially, though it wouldn't be a problem for phones to add support >> for it since it has been in use in WebRTC, youtube, skype, etc. > > actually it seems FFmpeg has an open source aptX encoder and decoder. > > https://patchwork.ffmpeg.org/patch/5879/ > > https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/aptx.c > > So I think someone could extend PA to use FFmpeg’s aptX and just enable aptX for all devices. Interesting, I guess we could do that, most likely it will be hard for distros since they don't normally ship with libavcodec since other codecs might not be 'free', but I guess users may be able to install that by themselves. -- Luiz Augusto von Dentz -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
