Linux-audio-dev

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7440 discussions

[linux-audio-dev] question re: hammerfall cards

by Thomas Vander Stichele

Hey, I just got a new box and two hammerfall 9636 cards for a project at work. The motherboard is a KT4 Ultra that has some onboard audio chip I don't care about but can't turn off either in the bios. I've put in the first hammerfall card, got alsa 0.9.0 rc7 from the freshrpms site (it's a redhat box), and started configuring things. I've got the feeling I'm missing some things, so here are some simple questions. a) It looks like the Hammerfall driver doesn't have a mixer interface, is this correct ? Here's an ls in the relevant dir: [root@framboos asound]# ls card0/ id pcm0c pcm0p rme9652 b) It looks like the onboard audio chip is controlled by an OSS driver, it doesn't show up in the alsa drivers either, which is fine by me, since I'm not going to use it. Is there any problem with OSS modules being loaded at the same time as ALSA modules ? c) I bought the card so I could record optical S/PDIF. The manual says I need to tell the card that I want the ADAT1 Input source to be Optical S/PDIF. Right now I get, in /proc/asound/card0/rme9652: [root@framboos card0]# cat rme9652 RME Digi9636 (Rev 1.5) (Card #1) Buffers: capture cdc00000 playback cda00000 IRQ: 5 Registers bus: 0xde000000 VM: 0xd088a000 Control register: 44008 Latency: 1024 samples (2 periods of 4096 bytes) Hardware pointer (frames): 0 Passthru: no Clock mode: autosync Pref. sync source: ADAT1 ADAT1 Input source: ADAT1 optical IEC958 input: Coaxial IEC958 output: Coaxial only IEC958 quality: Consumer IEC958 emphasis: off IEC958 Dolby: off IEC958 sample rate: error flag set ADAT Sample rate: 44100Hz ADAT1: No Lock ADAT2: No Lock ADAT3: No Lock Timecode signal: no Punch Status: 1: off 2: off 3: off 4: off 5: off 6: off 7: off 8: off 9: off 10: off 11: off 12: off 13: off 14: off 15: off 16: off 17: off 18: off Which I read as the Input source being ADAT optical instead of S/PDIF. How do I set it to S/PDIF ? d) the card came with a sub-D-connector that connects to the card's 15 pin port, which branches off two RCA jacks. I don't suppose these RCA jacks provide an analogue output by any chance on which I can monitor for sound ? I'm sure I'll bug you with more questions later on, but these are the most pressing ones at this point. Any help is greatly appreciated. Thomas -- The Dave/Dina Project : future TV today ! - http://davedina.apestaart.org/ <-*- thomas (dot) apestaart (dot) org -*-> Oh, baby, give me one more chance <-*- thomas (at) apestaart (dot) org -*-> URGent, the best radio on the Internet - 24/7 ! - http://urgent.rug.ac.be/

21 years, 6 months

[linux-audio-dev] LADSPA hints (part II)

by Paul Davis

i like the recently suggested new hints. i'd like to add the following, which would allow hosts to do the right thing with both SooperLooper and SC4, which are the first (only?) LADSPA plugins to have control output ports, but use them in very different ways. its almost impossible as it stands to build a GUI for them both that does them justice. --p /* Hint LADSPA_HINT_OUTPUT_METER indicates that the value of output control port is likely to be most meaningful to the user if displayed as a meter. Can be combined with LADSPA_HINT_LOGARITHMIC if the meter should use a log scale (e.g. dB). */ #define LADSPA_HINT_OUTPUT_METER 0x?? /* Hint LADSPA_HINT_OUTPUT_VALUE indicates that the value of output control port is likely to be most meaningful to the user if displayed as some kind of numeric value display. */ #define LADSPA_HINT_OUTPUT_VALUE 0x??

21 years, 6 months

[linux-audio-dev] Update On PDAudio (Portable Digital Recorder)

by Len Moskowitz

We've posted an update about our forthcoming 24/192 portable recorder: http://www.core-sound.com/HighResRecorderNews.html It runs on an iPAQ and the Linux version of the software uses Familiar/GPE and ALSA. Thanks to all for the high level of interest! Len Moskowitz Core Sound

21 years, 6 months

[linux-audio-dev] POSIX clocks now in linux 2.5

by Bob Ham

>From the 2.5.63 changelog: o POSIX clocks & timers Phat :) -- Bob Ham <rah(a)bash.sh>

21 years, 6 months

[linux-audio-dev] MWPP I-Ds ...

by John Lazzaro

Hi everyone, The months fly off the calendar, and the time for the next IETF meeting arrives (in San Francisco later this month). Pick up the latest version of the MWPP I-D's at: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-mwpp.txt http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-guide.txt Back at the end of the last meeting, I had predicted these documents would be "candidate Last Call" (the end of the writing process and the beginning of the vetting process ...), but alas, it was not meant to be. But I really think we're only a month away or so ... the things left to do are doable and not overwhelming. ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

21 years, 6 months

[linux-audio-dev] Re: [linux-audio-user] Re: New LADSPA Hints (Was: [ANNOUNCE] tapiir-0.7.1)

by Mike Rawes

Think this needs to go to LAD too... --- Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> wrote: > I think there was one more too, but I can't think what it was... I remember one about sidechains or something. I don't know what a sidechain is, though, I just recall seeing it somewhere :) > I agree AUDIO_RATE_CONTROL should be renamed. > > There was a suggestion on ardour-dev that a hint to say whether control outs > were supposed to be informative or a source of control data might help, > but I'm not sure about it. Not sure what 'informative' means here... what information do we get if we ignore the control data on the output? > Does someone want to reword these in a more meaningful way? If not I'l do > it, then you'l be sorry ;). I'll have a go :) (The LADSPA_IS_* things will need to be added too) /* Hint MOMENTARY indicates that that a control should behave like a momentary switch, such as a reset or sync control. LADSPA_HINT_MOMENTARY may only be used in combination with LADSPA_HINT_TOGGLED. */ #define LADSPA_HINT_MOMENTARY 0x40 /* Hint RANDOMISABLE indicates that it's meaningful to randomise the port if the user hits a button. This is useful for the steps of control sequencers, reverbs, and just about anything that's complex. A control with this hint should not result in anything too suprising happening to the user (eg. sudden +100dB gain would be unpleasant). */ #define LADSPA_HINT_RANDOMISABLE 0x80 /* Plugin Ports: Plugins have `ports' that are inputs or outputs for audio or data. Ports can communicate arrays of LADSPA_Data (for audio or continuous control inputs/outputs) or single LADSPA_Data values (for control input/outputs). This information is encapsulated in the LADSPA_PortDescriptor type which is assembled by ORing individual properties together. Note that a port must be an input or an output port but not both and that a port must be one of either control, audio or continuous. */ [...] /* Property LADSPA_PORT_CONTINUOUS_CONTROL indicates that the port is a control port with data supplied at audio rate. */ #define LADSPA_PORT_CONTINUOUS_CONTROL 0x10 - Mike > > - Steve > > > On Wed, 15 Jan 2003 18:13:35 +0000 > > Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> wrote: > > > > > There have been a few suggestions recently, I'l try to summarise them > > > for comment. > > > > > > MOMENTARY. A hint to suggest that a control should behave like a > > > momentary switch, eg. on for as long as the user holds down the > > > key/mouse button/whatever. Useful for reset or sync controls for > > > example. Would be useful in the DJ flanger. Only applies to TOGGLED > > > controls. > > > > > > AUDIO_RATE_CONTROL. Hints than an audio control should/could be > > > controlled by a high time res. slider or control data, but shouldn't > > > be connected to the next audio signal by default. I can't think of any > > > simple examples off hand, but combined with MOMENTARY it could be used > > > for sample accurate tempo tapping. > > > > > > RANDOMISABLE. Hints that its useful/meaningful to randomise the port > > > if the user hits a button. This is useful for the steps of control > > > sequencers, reverbs, and just about anything that's complex. Allows > > > you to specify which controls can be randomised without anything too > > > supprising happening to the user (eg. sudden +100dB gain would be > > > unpleasent). __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com

21 years, 6 months

[linux-audio-dev] using kernel 2.5

by Paul Davis

bob mentioned issues with the serial port. i'd like to amplify that. if you are using a serial modem (COM1, COM2) etc, and you don't specify "EXPERIMENTAL" source support, you won't even have a chance to build the serial driver. once you do build it, it won't work for PPP (in my experience).

21 years, 6 months

[linux-audio-dev] Help wanted with audio app design

by Arthur Peters

I have been working on an audio processing/synthesis application that should have the power of Reason and Buzz plus the ability to be used effectivly in live proformance. Some of you may have read my earlier emails on this subject. I call it Voltage. The main features that I want but are not availiable in other software are: - Linux and Open-Source - the ability to route and process sequence data (MIDI like data). This would allow very powerful chordization and arpegiation. - the ability to create sequence loops in a flexible way (like Reason Matrix except without the limitations). I'd also like to be able to record/modify them live without stoping the playback. - the ability to control things in complex ways using scripting of some sort (maybe as a machine that is scripted to create certain sequence events) What I am looking for is someone to help me (an inexperienced software designer) design this program. That person don't nesseserily need to help code the program. I've desided I need help after multiple failed attempts. I think my current ideas are closer to a working design than past ones, but I don't want to code it then find out doesn't work (like I did last time round). If you are willing to help or have any tips or books I should read, etc. please email me. Thanks much. -Arthur -- Arthur Peters <amp(a)singingwizard.org>

21 years, 6 months

Re: [linux-audio-dev] Fwd: CSL Motivation (fwd)

by Stefan Westerfeld

Hi! On Tue, Feb 25, 2003 at 07:48:11PM +0200, Kai Vehmanen wrote: > Date: Tue, 25 Feb 2003 12:20:22 -0500 > From: Paul Davis <paul(a)linuxaudiosystems.com> > Reply-To: linux-audio-dev(a)music.columbia.edu > To: linux-audio-dev(a)music.columbia.edu > Subject: Re: [linux-audio-dev] Fwd: CSL Motivation > > >There are discussions on kde-multimedia about > >the future of Linux/Unix multimedia (especially sound). > >This is one of the most interesting messages. > > CSL is proposed primarily as a wrapper layer around existing APIs. as > such, it seems to me to have no particular merits over PortAudio, > which has the distinct advantages of (1) existing CSL also "exists". > (2) working on many platforms already and You're right about that one: CSL is not as complete as PortAudio w.r.t to portability. > (3) using well-developed abstractions. I do not believe that something is ever a "well-developed abstraction" by itself. Something is always a "well-developed abstraction" from something, designed to achieve a certain purpose. From the PortAudio homepage: | PortAudio is intended to promote the exchange of audio synthesis software | between developers on different platforms, and was recently selected as the | audio component of a larger PortMusic project that includes MIDI and sound | file support. This clearly states the purpose: if you want to write audio synthesis software, then you should use PortAudio. Then, I assume, the abstraction is well- developed. However, it does not state: "... is intended to play sound samples with sound servers easily. Or: ... is intended to port existing applications easily. Or: ... is intended to let the application choose its programming model freely." No. PortAudio makes a lot of choices for the software developer, and thus provides an easy abstraction. This will mean, however, that actually porting software to PortAudio will probably be hard (compared to CSL), whereas writing new software for PortAudio might be convenient, _if_ the software falls in the scope of what the abstraction was made for. > CSL was > written as if PortAudio doesn't exist. I don't know if this a NIH > attitude, or something else, but I see little reason not use consider > PortAudio as *the* CSL, and by corollary, little reason to develop Yet > Another Wrapper API. Well, I gave you some. The paper gives some more. Basically, CSL is intended for porting _most_ free software, whereas PortAudio is intended for portable synthesis software. I think PortAudio would benefit in _supporting_ CSL, rather than aRts for instance, because CSL is more generic ; once new sound servers (like MAS) come up, you need not patch PortAudio all the time, but just one place: a CSL driver. The same is valid for other meta-frameworks like SDL. > the only reason i was happy writing JACK was > precisely because its not another wrapper API - it specifically > removes 90% of the API present in ALSA, OSS and other similar HAL-type > APIs. I am glad you did write JACK, although back then I thought it was just another try to redo aRts (and we had some heated discussions back then), because some people seem to like it. If some people will like CSL, why not? If you added CSL support to JACK right now, you would never need to bother with any of the "sound server guys" like me again, because you could always say: "support CSL in your sound server thing, and then JACK will support your sound server". On the other hand, if you added JACK support to CSL, you could also mix the output of all of these "sound servers" into JACK, without endangering your latency properties. Cu... Stefan -- -* Stefan Westerfeld, stefan(a)space.twc.de (PGP!), Hamburg/Germany KDE Developer, project infos at http://space.twc.de/~stefan/kde *-

21 years, 6 months

[linux-audio-dev] LAD meeting - Linux Sound Night

by Frank Barknecht

Hallo, with the LAD meeting getting closer, I'm getting a bit curious about, what the plans are for the open "Linux Sound Night" on 15.3.? Will we hear some of you guys perform and Paul records it? ciao -- Frank Barknecht _ ______footils.org__

21 years, 6 months

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Linux-audio-dev