Re: [Alsa-user] Bluetooth audio
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From: Torstein H. <he...@re...> - 2013-03-27 18:56:41
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On Wed, Mar 06, 2013 at 12:34:58 +0100, Thorsten Mühlfelder wrote: > > But there are some questions left: Bluetooth A2DP uses lossy > > compression on the audio data and only SBC codec is mandatory. AFAIK > > some devices also can use MP3 or the new APT-X codec. > > 1. Can I use APT-X with Alsa? > > 2. Is the compression done by software (in the driver) or in > > hardware (e.g. in the USB dongle)? > > On some review I've read that the Apt-X compression is done in > hardware by the BT stick and it should also work with Alsa. Is this > correct? I just tried this with Sennheiser BTD 500 USB and Sennheiser MM-450X, both Apt-X capable. The BTD 500 only supports A2DP, AVRCP and HSP Bluetooth profiles, and handles the Bluetooth stack in the USB dongle. It only exposes a USB sound card that works fine with ALSA. According to the led on the dongle, it uses Apt-X. There aren't that many USB dongles with Apt-X support for sale. Creative BT-D1/BT-W1 looks to be similar to the BTD 500, exposing only a USB sound card. Azio BTD-V400 on the other hand appears to support other Bluetooth profiles like DUN and FTP, and might require more software support. Torstein |