sound/cards/audiophile-usb.rst

31 The device has 4 audio interfaces, and 2 MIDI ports:
35    - This port supports 2 pairs of line-level audio inputs (1/4" TS and RCA)
48 * sample rate from 8kHz to 96kHz
57  * 16-bit/48kHz ==> 4 channels in + 4 channels out
61  * 24-bit/48kHz ==> 4 channels in + 2 channels out,
62    or 2 channels in + 4 channels out
66  * 24-bit/96kHz ==> 2 channels in _or_ 2 channels out (half duplex only)
129  * hw:1,2 is Do in AC3/DTS passthrough mode
135 One exception is the hw:1,2 port which was reported to be Little Endian
137 This has been fixed in kernel 2.6.23 and above and now the hw:1,2 interface
156    % aplay -D hw:1,2 --channels=6 ac3_S16_BE_encoded_file.raw
197    - 16bits 48kHz mode with Di disabled
200    - hw:1,2 is not available
204    - 16bits 48kHz mode with Di enabled
207    - hw:1,2 is not available
234    - 24bits 48kHz mode with Di disabled
237    - hw:1,2 is not available
241    - 24bits 48kHz mode with Di enabled
245    - hw:1,2 is not available
249    - 24bits 96kHz mode
254    - hw:1,2 is not available
266    - 16bits 48kHz mode with only the Do port enabled
350    - When set to ``1`` the rate range is 48.1-96kHz
351    - Otherwise the sample rate range is 8-48kHz
357    - Note that b2 implies b3 as the 96kHz mode is only supported for 24 bits
377    - for instance choosing 0x05 (16bits 96kHz) will fail back to 0x09 since
382    - choosing b2 will prepare all interfaces for 24bits/96kHz but you'll
402  * USB Interface nb.2
422 Each interface has 5 altsettings (AltSet 1,2,3,4,5) except:
431   - 24-bit depth, 48.1-96kHz sample mode
434 * AltSettings 2 corresponds to
436   - 24-bit depth, 8-48kHz sample mode
441   - 24-bit depth, 8-48kHz sample mode
446   - 16-bit depth, 8-48kHz sample mode
451   - 16-bit depth, 8-48kHz sample mode
456   - 16-bit depth, 8-48kHz sample mode
462  * if DTS is chosen, only Interface 2 with AltSet nb.6 must be
464  * if 96KHz only AltSets nb.1 of each interface must be selected
465  * if samples are using 24bits/48KHz then AltSet 2 must me used if
468  * if samples are using 16bits/48KHz then AltSet 4 must me used if
482 There are 2 main potential issues when using Jackd with the device:
510 For instance here is one way to run Jack with 2 playback channels on Ao and 2
521 Getting 2 input and/or output interfaces in Jack
530 * The Audiophile USB is seen as 2 (or three) Alsa devices: hw:1,0, hw:1,1
531   (and optionally hw:1,2)