diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/sound/alsa/Audiophile-Usb.txt | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/Documentation/sound/alsa/Audiophile-Usb.txt b/Documentation/sound/alsa/Audiophile-Usb.txt index 3ba45ad..4692c8e 100644 --- a/Documentation/sound/alsa/Audiophile-Usb.txt +++ b/Documentation/sound/alsa/Audiophile-Usb.txt @@ -1,4 +1,4 @@ - Guide to using M-Audio Audiophile USB with ALSA and Jack v1.1 + Guide to using M-Audio Audiophile USB with ALSA and Jack v1.2 ======================================================== Thibault Le Meur <Thibault.LeMeur@supelec.fr> @@ -13,6 +13,9 @@ of the device. The device has 4 audio interfaces, and 2 MIDI ports: * Analog Stereo Input (Ai) + - This port supports 2 pairs of line-level audio inputs (1/4" TS and RCA) + - When the 1/4" TS (jack) connectors are connected, the RCA connectors + are disabled * Analog Stereo Output (Ao) * Digital Stereo Input (Di) * Digital Stereo Output (Do) @@ -42,7 +45,7 @@ Important facts about the Digital interface: though I haven't tested it under linux - Note that in this setup only the Do interface can be enabled * Apart from recording an audio digital stream, enabling the Di port is a way -to syncrhonize the device to an external sample clock +to synchronize the device to an external sample clock - As a consequence, the Di port must be enable only if an active Digital source is connected - Enabling Di when no digital source is connected can result in a @@ -180,7 +183,7 @@ IMPORTANT NOTE WHEN SWITCHING CONFIGURATION: or changing modprobe.conf) - turn on the device -2.2.2.3 - Setting and switching configurations with the device_setup parameter +2.2.2.3 - Audiophile USB's device_setup structure If you want to understand the device_setup magic numbers for the Audiophile USB, you need some very basic understanding of binary computation. However, @@ -226,7 +229,7 @@ Caution: - choosing b2 will prepare all interfaces for 24bits/96kHz but you'll only be able to use one at the same time -2.2.3 - Technical Details for Audiophile Usb +2.2.3 - USB implementation details for this device You may safely skip this section if you're not interrested in driver development. @@ -234,20 +237,20 @@ development. This section describes some internals aspect of the device and summarize the data I got by usb-snooping the windows and linux drivers. -The M-Audio Audiophile USB has 7 Usb Interfaces: +The M-Audio Audiophile USB has 7 USB Interfaces: a "USB interface": - * Usb Interface nb.0 - * Usb Interface nb.1 + * USB Interface nb.0 + * USB Interface nb.1 - Audio Control function - * Usb Interface nb.2 + * USB Interface nb.2 - Analog Output - * Usb Interface nb.3 + * USB Interface nb.3 - Digital Output - * Usb Interface nb.4 + * USB Interface nb.4 - Analog Input - * Usb Interface nb.5 + * USB Interface nb.5 - Digital Input - * Usb Interface nb.6 + * USB Interface nb.6 - MIDI interface compliant with the MIDIMAN quirk Each interface has 5 altsettings (AltSet 1,2,3,4,5) except: @@ -326,5 +329,5 @@ atid=425939 After having applied the patch you can run jackd with the following command line: -# /usr/local/bin/jackd -R -dalsa -Phw:1,0 -r48000 -p128 -n2 -D -Chw:1,1 + % jackd -R -dalsa -Phw:1,0 -r48000 -p128 -n2 -D -Chw:1,1 |