Linux-audio-dev November 2002

linux-audio-dev@lists.linuxaudio.org

87 participants
85 discussions

[linux-audio-dev] Multi-port MIDI interfaces

by iroro

Hi, I'm looking for an "off-the-shelf" Multi-port MIDI interface, (Serial or USB) with some decent linux drivers. Anyone have any suggestions, advice, stories, pointers ?? ... i've googled but nothing interesting turned up. thanks! iroro -- --o0o------------------------------------------------------o0o-- Soon we will be together, writhing profitably on a bed of non-seasonal vegetables in equine bliss. With this vision I see no reason why the operation to remove a 2.2kg uneviscerated turkey carcass from my pericardium should fail [tscg, 2002] --o0o------------------------------------------------------o0o--

22 years, 1 month

[linux-audio-dev] Cheap 8 channel Out: multi-IO or USB ? performance etc

by Benno Senoner

Hi, a friend of mine is building a system that plays sounds on different speakers (up to 8-10 mono channels ) based on certain input events such as light sensors and mechanical triggers. The audio quality does not need to be high. Latency can be as high as 100 msec. My question is what is the cheapest way to get 8-10 analogue outs. (consumer quality). I heard of USB speakers, could this be a valid solution ? Are they supported under linux ? If yes which kind of models ? Can one use multiple stereo USB speakers on the same USB bus ? e.g. CD quality stereo audio uses 1.4Mbit thus I was wondering how much channels one can reliably stream over USB so that there no dropouts occur ? Recent PCs have two USB outs, is this the same shared bus or can one max out the bandwidth on both ports simultaneously ? How about adding more USB cards, is this supported under Linux ? The other alternative would be to use a multi-io card with 8 or more channels or multiple 4 channel cards ? The Terratec EWS88 8-analogue channels out seems interesting but a bit expensive for my purpose. How about using 2 4-channel cards ? Which card would you suggest ? Hoontech ? Are these (or similar cards) still available ? Sorry for all these questions and thanks for infos ! cheers, Benno -- http://linuxsampler.sourceforge.net Building a professional grade software sampler for Linux. Please help us designing and developing it.

22 years, 1 month

[linux-audio-dev] Alternitif Bitkisel kanser ilaci Carctol Alternative Cancer Healing

by carctol＠yahoo.com

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22 years, 1 month

[linux-audio-dev] mpu401 fifo scheduling on linux2.4.18

by Bruce M Beach

Hello All I'm sending some midi data to synthesizer for playback and it appears that the fifo /dev/midi (cmpci mpu401 driver) is not emptying as fast as it should(could), since the play back is highly irregular. Here are some numbers. 1) The timeing slice remains constant at 30 msec +/- 3usec, timed both at the beginning and end of the loop, so the irregularities are not due to loop variations. 2) A maximum of 64 bytes burst, with around 5 bytes normal and an average of 1 byte (say) (ie many slices do nothing) can occur during a slice, the buffer for the driver is 128 bytes with around a maximum capability of around 116 bytes transmitted per slice, so the midi channel can easily sustain the transmission rate at the rate I am sending information. 4) System load while the program is running is around 0.1% 5) The midi performance remains the same even if I do something like build the kernel, and untar some package say glibc at the same time. When I say irregular I mean, for instance on a run of 16th notes the notes will radically speed up and slow down. The notes all have the correct pitches and voice changes etc. are all happening correctly. Just this strange tempo problem. Any thoughts or suggestions would be welcome. Bruce

22 years, 1 month

Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt

by Stefan Nitschke

> > > On my asus A7V266-E board i had to set down dma mode from DMA100 to >DMA33 > > get LL working fine. (<3ms) > >That is very interesting information (I have the same board). Did you >discover >this by trial and error? > Yes and No ;) i had one "old" cable to disk2 and when i tried the latency test on the 2nd drive (DMA33) all worked fine. I have the latest BIOS installed. - Stefan _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail

22 years, 1 month

Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt

by Stefan Nitschke

>From: Maarten de Boer <mdeboer(a)iua.upf.es> >Date: Wed, 20 Nov 2002 08:29:31 +0100 > >On 19 Nov 2002 15:29:19 -0500 >jfm3 <jfm3(a)ouroboros-complex.org> wrote: > > > I'm running the low latency and preemption kernel patches on 2.4.19. I'm > > getting disk copy latency of around 10ms. Since I'm a real time person > > (according to M. Goggins) who doesn't use the hd in real time, I can > > live with this, but it bugs me. I've tried ext2 and ext3, no difference. > > Any other tips? > >Do you have support for your chipset unabled under "IDE, ATA and ATAPI >Block devices" in your kernel configuration, and "Use PCI DMA by default >when available"? I believe this is rather important. > On my asus A7V266-E board i had to set down dma mode from DMA100 to DMA33 get LL working fine. (<3ms) - Stefan _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

22 years, 1 month

[linux-audio-dev] disk latency under 2.4.19 ll+preempt

by jfm3

I'm running the low latency and preemption kernel patches on 2.4.19. I'm getting disk copy latency of around 10ms. Since I'm a real time person (according to M. Goggins) who doesn't use the hd in real time, I can live with this, but it bugs me. I've tried ext2 and ext3, no difference. Any other tips? (Tue Nov 19 15:20:19) (root@head:/home/jfm3/latencytest/latencytest0.42-png) bash> ./do_tests none 3 256 0 350000000 x11perf - X11 performance program, version 1.5 The XFree86 Project, Inc server version 40200000 on :0.0 from head Tue Nov 19 15:20:32 2002 Sync time adjustment is 0.2320 msecs. 2000 reps @ 3.8063 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8071 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8092 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8064 msec ( 263.0/sec): Scroll 500x500 pixels 2000 reps @ 3.8187 msec ( 262.0/sec): Scroll 500x500 pixels 10000 trep @ 3.8095 msec ( 262.0/sec): Scroll 500x500 pixels 120 reps @ 52.5438 msec ( 19.0/sec): ShmPutImage 500x500 square 120 reps @ 52.7976 msec ( 18.9/sec): ShmPutImage 500x500 square 120 reps @ 52.9418 msec ( 18.9/sec): ShmPutImage 500x500 square 120 reps @ 52.8095 msec ( 18.9/sec): ShmPutImage 500x500 square 120 reps @ 52.8810 msec ( 18.9/sec): ShmPutImage 500x500 square 600 trep @ 52.7948 msec ( 18.9/sec): ShmPutImage 500x500 square fragment latency = 1.451247 ms cpu latency = 1.160998 ms 2.1ms ( 0)| 1MS num_time_samples=57348 num_times_within_1ms=57348 factor=100.000000 2MS num_time_samples=57348 num_times_within_2ms=57348 factor=100.000000 PIXEL_PER_MS=155 fragment latency = 1.451247 ms cpu latency = 1.160998 ms 2.0ms ( 0)| 1MS num_time_samples=20877 num_times_within_1ms=20877 factor=100.000000 2MS num_time_samples=20877 num_times_within_2ms=20877 factor=100.000000 PIXEL_PER_MS=155 fragment latency = 1.451247 ms cpu latency = 1.160998 ms 4.6ms ( 2)| 1MS num_time_samples=28116 num_times_within_1ms=28113 factor=99.989330 2MS num_time_samples=28116 num_times_within_2ms=28115 factor=99.996443 PIXEL_PER_MS=155 -rw-r--r-- 1 root root 350000000 Nov 19 15:23 tmpfile fragment latency = 1.451247 ms cpu latency = 1.160998 ms 6.9ms ( 44)| 1MS num_time_samples=68188 num_times_within_1ms=68144 factor=99.935473 2MS num_time_samples=68188 num_times_within_2ms=68144 factor=99.935473 PIXEL_PER_MS=155 -rw-r--r-- 1 root root 350000000 Nov 19 15:23 tmpfile -rw-r--r-- 1 root root 350000000 Nov 19 15:25 tmpfile2 fragment latency = 1.451247 ms cpu latency = 1.160998 ms 6.5ms ( 8)| 1MS num_time_samples=54930 num_times_within_1ms=54921 factor=99.983616 2MS num_time_samples=54930 num_times_within_2ms=54923 factor=99.987257 PIXEL_PER_MS=155 -rw-r--r-- 1 root root 350000000 Nov 19 15:23 tmpfile -rw-r--r-- 1 root root 350000000 Nov 19 15:25 tmpfile2 -- (jfm3 2838 BCBA 93BA 3058 ED95 A42C 37DB 66D1 B43C 9FD0)

22 years, 1 month

[linux-audio-dev] [OT] Linux Music & Sound Software site updated

by Dave Phillips

Greetings: As of November 19 2002 the Linux Music & Sound Applications pages have been updated. This site contains more links to Linux audio, MIDI, and DSP sites than you can shake a stick at (== a lot), making it the most comprehensive listing of its kind on the Internet. The site may be reached here: http://sound.condorow.net (USA) Here: http://linuxsound.at (Europe) Here: http://linuxsound.ymo.org (Japan) (As aways, the Japanese site will not update until midnight tonight.) Best regards, == Dave Phillips The Book Of Linux Music & Sound at http://www.nostarch.com/lms.htm The Linux Soundapps Site at http://linux-sound.org Currently listening to: New London Consort, "Veritas veritatum" (Carmina Burana)

22 years, 1 month

[linux-audio-dev] libsndfile failure

by Miha Tomsic

Hello! I keep getting strange problems with libsndfile 1.0.1 lib. I first noticed it running sweep and then I went back to libsndfile source and tried out ht etests and they die at reading wav files. josef:/usr/src/libsndfile-1.0.1/tests$ ./write_read_test wav pcm_test_char : char.wav .......... Line 314: sf_open (SFM_RDWR) failed : File contains data in an unimplemented format. josef:/usr/src/libsndfile-1.0.1/tests$ ./misc_test wav update_header_test : header.wav ........ Line 175: sf_open (SFM_RDWR) failed : File contains data in an unimplemented format. I don't remember having any problems with libsndfile apps before and I don't remember changing anything on my box lately. Any ideas what to do and what to check? Thanks and take care, Miha...

22 years, 1 month

[linux-audio-dev] wow. who'da thunk it?

by Paul Davis

We might be a bit early to the party. Maybe the real guests will kick our asses out the door. Hope not .... ---------------------------------------------------------------------- Yamaha Validates MontaVista Vision for Next-Generation Digital Audio Products ... MontaVista Linux Professional Edition 2.1 is one of the most widely used embedded Linux operating systems and development platforms. It includes an impressive array of cross-development tools for system and application code, unparalleled processor and board support, native real-time performance in Linux, and hundreds of deployable utilities, libraries, drivers, and other run-time components. Earlier this year, MontaVista Linux Professional Edition was named Best Embedded Linux Solution at the New York Linux World and Expo. The product received the Electron dOr award for Best Embedded Tool and Development Solution for 2002 from the prestigious French publication Electronique, and the Readers Choice Award for Favorite Embedded Solution 2002 from the American magazine Linux Journal. http://www.mvista.com/news/2002/yamaha.html

22 years, 1 month

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Linux-audio-dev November 2002