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author | Takashi Iwai <tiwai@suse.de> | 2016-11-10 16:31:07 +0100 |
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committer | Takashi Iwai <tiwai@suse.de> | 2016-11-10 22:33:22 +0100 |
commit | e7030c96fc0e08b9d1c4fb1cbedb326a3f46dad3 (patch) | |
tree | 8a6ae356bdc57b8e5b9185e267e791cf91123f2e /Documentation/sound/cards | |
parent | 72e69166714bfa7bfafb7a06a8499de472299ab9 (diff) | |
download | linux-stable-e7030c96fc0e08b9d1c4fb1cbedb326a3f46dad3.tar.gz linux-stable-e7030c96fc0e08b9d1c4fb1cbedb326a3f46dad3.tar.bz2 linux-stable-e7030c96fc0e08b9d1c4fb1cbedb326a3f46dad3.zip |
ALSA: doc: ReSTize emu10k1-jack.txt
Another simple conversion from a plain text file.
Put to cards directory.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound/cards')
-rw-r--r-- | Documentation/sound/cards/emu10k1-jack.rst | 78 | ||||
-rw-r--r-- | Documentation/sound/cards/index.rst | 2 |
2 files changed, 79 insertions, 1 deletions
diff --git a/Documentation/sound/cards/emu10k1-jack.rst b/Documentation/sound/cards/emu10k1-jack.rst new file mode 100644 index 000000000000..6597f1ea83f0 --- /dev/null +++ b/Documentation/sound/cards/emu10k1-jack.rst @@ -0,0 +1,78 @@ +================================================================= +Low latency, multichannel audio with JACK and the emu10k1/emu10k2 +================================================================= + +This document is a guide to using the emu10k1 based devices with JACK for low +latency, multichannel recording functionality. All of my recent work to allow +Linux users to use the full capabilities of their hardware has been inspired +by the kX Project. Without their work I never would have discovered the true +power of this hardware. + + http://www.kxproject.com + - Lee Revell, 2005.03.30 + + +Until recently, emu10k1 users on Linux did not have access to the same low +latency, multichannel features offered by the "kX ASIO" feature of their +Windows driver. As of ALSA 1.0.9 this is no more! + +For those unfamiliar with kX ASIO, this consists of 16 capture and 16 playback +channels. With a post 2.6.9 Linux kernel, latencies down to 64 (1.33 ms) or +even 32 (0.66ms) frames should work well. + +The configuration is slightly more involved than on Windows, as you have to +select the correct device for JACK to use. Actually, for qjackctl users it's +fairly self explanatory - select Duplex, then for capture and playback select +the multichannel devices, set the in and out channels to 16, and the sample +rate to 48000Hz. The command line looks like this: +:: + + /usr/local/bin/jackd -R -dalsa -r48000 -p64 -n2 -D -Chw:0,2 -Phw:0,3 -S + +This will give you 16 input ports and 16 output ports. + +The 16 output ports map onto the 16 FX buses (or the first 16 of 64, for the +Audigy). The mapping from FX bus to physical output is described in +sb-live-mixer.rst (or audigy-mixer.rst). + +The 16 input ports are connected to the 16 physical inputs. Contrary to +popular belief, all emu10k1 cards are multichannel cards. Which of these +input channels have physical inputs connected to them depends on the card +model. Trial and error is highly recommended; the pinout diagrams +for the card have been reverse engineered by some enterprising kX users and are +available on the internet. Meterbridge is helpful here, and the kX forums are +packed with useful information. + +Each input port will either correspond to a digital (SPDIF) input, an analog +input, or nothing. The one exception is the SBLive! 5.1. On these devices, +the second and third input ports are wired to the center/LFE output. You will +still see 16 capture channels, but only 14 are available for recording inputs. + +This chart, borrowed from kxfxlib/da_asio51.cpp, describes the mapping of JACK +ports to FXBUS2 (multitrack recording input) and EXTOUT (physical output) +channels. + +JACK (& ASIO) mappings on 10k1 5.1 SBLive cards: + +============== ======== ============ +JACK Epilog FXBUS2(nr) +============== ======== ============ +capture_1 asio14 FXBUS2(0xe) +capture_2 asio15 FXBUS2(0xf) +capture_3 asio0 FXBUS2(0x0) +~capture_4 Center EXTOUT(0x11) // mapped to by Center +~capture_5 LFE EXTOUT(0x12) // mapped to by LFE +capture_6 asio3 FXBUS2(0x3) +capture_7 asio4 FXBUS2(0x4) +capture_8 asio5 FXBUS2(0x5) +capture_9 asio6 FXBUS2(0x6) +capture_10 asio7 FXBUS2(0x7) +capture_11 asio8 FXBUS2(0x8) +capture_12 asio9 FXBUS2(0x9) +capture_13 asio10 FXBUS2(0xa) +capture_14 asio11 FXBUS2(0xb) +capture_15 asio12 FXBUS2(0xc) +capture_16 asio13 FXBUS2(0xd) +============== ======== ============ + +TODO: describe use of ld10k1/qlo10k1 in conjunction with JACK diff --git a/Documentation/sound/cards/index.rst b/Documentation/sound/cards/index.rst index c9d7ce4286b2..251f1d7675f7 100644 --- a/Documentation/sound/cards/index.rst +++ b/Documentation/sound/cards/index.rst @@ -8,4 +8,4 @@ Card-Specific Information cmipci sb-live-mixer audigy-mixer - + emu10k1-jack |