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 ------------------------------------------------------------------------------ Own the Future-Intel® Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
