Re: [Alsa-user] Bluetooth audio

2013-03-06 Thread Thorsten Mühlfelder
> 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.

[Alsa-user] Bluetooth audio

2013-03-01 Thread Thorsten Mühlfelder
a 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)? 3. Is it possible to define the used bitrates? Thanks for any tips. -- Tho

Re: [Alsa-user] Status of CM6631 USB

2013-02-28 Thread Thorsten Mühlfelder
ymore, so the device was lying around unused for the last three months. If someone else from Germany (shipping costs!) wants to test it, I can lend him the device for three months. -- Thorsten Mühlfelder Salix OS: www.salixos.org --

Re: [Alsa-user] Status of CM6631 USB

2012-12-13 Thread Thorsten Mühlfelder
> I've read a quite long discussion here about this USB Audio 2.0 chip. > Apparently there have been problems when switching sample rates. > Now I have bought a cheap USB to S/PDIF interface with this chip (search for > "CM6631 USB" at www.aliexpress.com) and I wonder if it is better supported >

Re: [Alsa-user] Status of CM6631 USB

2012-12-12 Thread Thorsten Mühlfelder
ven produces some noise when pressing stop. > This is a known bug, also most probably flaw in the CMEDIA chip, and not > yet properly worked around in the snd-usb driver. If you want to > investigate, have a look at the feedback format autodetection code in > sound/usb/endpoint.c. Th

Re: [Alsa-user] Status of CM6631 USB

2012-12-11 Thread Thorsten Mühlfelder
asound/card2/pcm0p/sub0/hw_params shows the correct playback format. Stop/start playback solves the problem. -- Thorsten Mühlfelder Salix OS: www.salixos.org -- LogMeIn Rescue: Anywhere, Anytime Remote support for

Re: [Alsa-user] Status of CM6631 USB

2012-12-11 Thread Thorsten Mühlfelder
me: Available formats: - S16_LE - S32_LE But nothing about sampling rate. I'll try a newer kernel first... -- Thorsten Mühlfelder Salix OS: www.salixos.org -- LogMeIn Rescue: Anywhere, Anytime Remote support for I

Re: [Alsa-user] Status of CM6631 USB

2012-12-11 Thread Thorsten Mühlfelder
cm0p/sub0/hw_params access: MMAP_INTERLEAVED format: S32_LE subformat: STD channels: 2 rate: 48000 (48000/1) period_size: 6000 buffer_size: 24001 Additional questions: * how can I check device capabilities? * which Alsa version is needed for USB Audio 2

Re: [Alsa-user] Status of CM6631 USB

2012-11-28 Thread Thorsten Mühlfelder
tion. So this is why I've asked here again. As soon as the China device arrives I can test if it has the same issues like your Schiit. Greetings -- Thorsten Mühlfelder Salix OS: www.salixos.org -- Keep yourself

[Alsa-user] Status of CM6631 USB

2012-11-28 Thread Thorsten Mühlfelder
r supported now. Greetings -- Thorsten Mühlfelder Salix OS: www.salixos.org -- Keep yourself connected to Go Parallel: INSIGHTS What's next for parallel hardware, programming and related areas? Interviews and blog