tag:old.nabble.com,2006:forum-14243Nabble - OpenAL2009-12-02T03:54:22ZOpenAL is a cross-platform 3D audio API appropriate for use with gaming applications and many other types of audio applications. OpenAL home is <a href="http://www.openal.org/" target="_top" rel="nofollow">here</a>.tag:old.nabble.com,2006:post-26607769Re: How to create a openal filter to process ALL SOUNDS played on the system2009-12-02T03:54:22Z2009-12-02T03:54:22ZDaniel PEACOCK<br><br><br><br>If you are talking about adding a filter to all audio from all applications
<br>(each using any audio API) before it is output to speakers/headphones, then
<br>this beyond the scope of OpenAL.
<br><br>On Windows Vista and Windows 7 you may be able to achieve this by creating
<br>your own Global APO.
<br><br>Dan
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<br> javi oliver
<br> <javioliver@gmail
<br> .com> To
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<br> [Openal] How to create a openal
<br> filter to process ALL SOUNDS played
<br> 12/02/2009 11:31 on the system
<br> AM
<br>
<br>
<br>
<br>
<br>
<br><br><br><br><br>My question is how to capture all sounds that are sent to the Default
<br>output device in Windows, and filter them all before they get out the
<br>system.
<br><br>I started capturing sounds using MSVAD (WINDDK 3790.1830), which is an
<br>example of virtual audio device provided by Microsoft, but I could never do
<br>it worked well...
<br><br>I'm a bit new in OpenAL, so sorry if the question is too obvious.
<br><br>Thanks in advance,
<br>Javier_______________________________________________
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<br><blockquote class="quote light-black dark-border-color"><div class="quote light-border-color">
<div class="quote-author" style="font-weight: bold;">javi oliver wrote:</div>
<div class="quote-message shrinkable-quote">My question is how to *capture all sounds that are sent to the Default
<br>output device in Windows,* and filter them all before they get out the
<br>system.
<br><br>I started capturing sounds using MSVAD (WINDDK 3790.1830), which is an
<br>example of virtual audio device provided by Microsoft, but I could never do
<br>it worked well...
<br><br>I'm a bit new in OpenAL, so sorry if the question is too obvious.
<br><br>Thanks in advance,
<br>Javier
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</div></blockquote>
<p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26607573How to create a openal filter to process ALL SOUNDS played on the system2009-12-02T03:31:20Z2009-12-02T03:31:20Zjavi oliverMy question is how to <b>capture all sounds that are sent to the Default
output device in Windows,</b> and filter them all before they get out the
system.
<br><br>I started capturing sounds using MSVAD (WINDDK 3790.1830), which is an
example of virtual audio device provided by Microsoft, but I could
never do it worked well...<br><br>I'm a bit new in OpenAL, so sorry if the question is too obvious.<br><br>Thanks in advance,<br>Javier<br>
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<br>> The 'openal-soft' package merely contains the README, config and
<br>> openal-info binary. libopenal.so.1 is in a separate package that
<br>> only contains the library as per library packaging policy.
<br><br>I see.
<br><br>> Yes, I too think it's a race. SuperTuxKart locks up on startup,
<br>> even openal-info locks up sometimes.
<br><br>I think I got something knocked out that should work. It works for me still,
<br>and it fixes it for someone who was having lockups with the latest pulse. The
<br>changes have been pushed to Git/SVN.
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<br>> I'm planning 4-player split-screen multiplayer for a game and must
<br>> have multiple listeners for sound effects. Can someone tell me if
<br>> I've got anything wrong here?
<br>>
<br>> As best I can tell from reading old posts and stuff there will never
<br>> be multiple listener support in OpenAL (at least, not in the
<br>> foreseeable future).
<br><br>Technically, OpenAL Soft does support it. You can't get multiple listeners in
<br>a single context, but you can create multiple contexts from a single device
<br>and each context will have one listener. All contexts on a given device will
<br>go into a single mix, so there won't be any added latency. The contexts can
<br>share buffers (as they're on the same device), but not sources (each context
<br>has its own list of sources).
<br><br>However, you may need the latest Git/SVN version for this to work properly.
<br>There's a few bugs in 1.10 that can be tripped over.
<br><br>> The best way I've heard of simulating multiple listeners in OpenAL is
<br>> to set the listener to (0,0,0) and do the necessary transformations to
<br>> place sounds relative to the listener. Then for multiple listeners
<br>> you would play the same sound through multiple sources at different
<br>> positions relative to the listener. Is that about right? Are there
<br>> any other decent ways to do this? I'm a bit worried that I'll run low
<br>> on sources on some computers. For example, I have one computer with
<br>> motherboard audio that only provides 14 sources, which is barely
<br>> enough for single player.
<br><br>Software devices should be able to provide at least 256 sources (Generic
<br>Software, or OpenAL Soft's devices). If hardware can only provide 14 sources,
<br>then it's not really capable of handling what you need anyway, so such users
<br>should switch to software. I think any halfway decent hardware these days can
<br>provide at least 32.
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<br>have multiple listeners for sound effects. Can someone tell me if
<br>I've got anything wrong here?
<br><br>As best I can tell from reading old posts and stuff there will never
<br>be multiple listener support in OpenAL (at least, not in the
<br>foreseeable future).
<br><br>The best way I've heard of simulating multiple listeners in OpenAL is
<br>to set the listener to (0,0,0) and do the necessary transformations to
<br>place sounds relative to the listener. Then for multiple listeners
<br>you would play the same sound through multiple sources at different
<br>positions relative to the listener. Is that about right? Are there
<br>any other decent ways to do this? I'm a bit worried that I'll run low
<br>on sources on some computers. For example, I have one computer with
<br>motherboard audio that only provides 14 sources, which is barely
<br>enough for single player.
<br>--
<br>Terry
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<br><br>> 1. The Room Roll-off applies when the receiving FX Slot is "Environmental" in
<br>> EAX terminology, or has the AL_EFFECTSLOT_AUXILIARY_SEND_AUTO flag enabled
<br>> in EFX terminology. If the FX Slot contains a Reverb then the Room
<br>> Roll-off used in the calculations is the sum of the source and reverb's
<br>> Room Roll Factors, if the FX slot does not contain a reverb then the Room
<br>> RollOff used in the calculations is just the Source Room RollOff Factor.
<br><br>Ah good. I wanted to be 100% sure since the EFX specification relates the source room roll-off to the "reflected sound (early reflections and reverberation)" which is clearly reverb-centric.
<br><br>> 2. Source Gain clamping (AL_MIN_GAIN and AL_MAX_GAIN properties) should occur
<br>> after distance and cone attentuation, and (Source) gain (see AL Spec
<br>> Section 3.5). It should be done before Listener Gain is applied (which
<br>> acts like a master volume control).
<br><br>That's how I read it.
<br><br>> However, Chris is right ... it seems that the Generic Software or Generic
<br>> Hardware devices are not doing cone attenuation before source gain
<br>> clamping.
<br><br>Which is where the confusion was coming from.
<br><br>> 3. The EFX Filter Gain is applied after clamping. I guess you could argue
<br>> that this is a source-related attenuation and perhaps should be performed
<br>> before clamping - but because it is a frequency dependant attenuation it
<br>> doesn't really fit in with the other attenuations.
<br><br>Makes sense.
<br><br>> Dan
<br><br>Thanks for the clarifications. :)
<br><br>Regards,
<br> - Christopher
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<br><br>> Don't know about 1, but for 2, according to the 1.1 spec clamping is supposed
<br>> to occur after distance and cone attenuation, and after the source gain is
<br>> applied, but before the listener gain is applied (interestingly, it seems the
<br>> old Windows code did the clamping before the cones and listener gain, but
<br>> after the source gain is applied to distance attenuation; behavior which
<br>> OpenAL Soft has inherited).
<br><br>Precisely why I am checking, I noticed this discrepancy while verifying the send flags (which are correct, by the way).
<br><br>> Though that makes me curious now if the clamping is done before or after the
<br>> EFX filter gain.
<br><br>Good point, hopefully we can get this clarified.
<br><br>Regards,
<br> - Christopher
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<br>> Greetings,
<br>>
<br>> Just a couple quick questions today. I though I asked the first one
<br>> before, but can't seem to find it in my archives.
<br>>
<br>> 1. Does room roll-off apply to any effect type, or just the reverbs?
<br>>
<br>> 2. Should gain clamping occur after all attenuations (such as for cones),
<br>> or just the distance attenuation?
<br><br>Don't know about 1, but for 2, according to the 1.1 spec clamping is supposed
<br>to occur after distance and cone attenuation, and after the source gain is
<br>applied, but before the listener gain is applied (interestingly, it seems the
<br>old Windows code did the clamping before the cones and listener gain, but
<br>after the source gain is applied to distance attenuation; behavior which
<br>OpenAL Soft has inherited).
<br><br>Though that makes me curious now if the clamping is done before or after the
<br>EFX filter gain.
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<br><br>Just a couple quick questions today. I though I asked the first one before, but can't seem to find it in my archives.
<br><br>1. Does room roll-off apply to any effect type, or just the reverbs?
<br><br>2. Should gain clamping occur after all attenuations (such as for cones), or just the distance attenuation?
<br><br>Thanks in advance. :)
<br><br>Regards,
<br> - Christopher
<br>
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<br>> Seems the report of the crash wasn't with openal-soft, though. Comment 11 says
<br>> that openal-soft wasn't installed, and installing it and configuring to use
<br>> alsa makes it work fine (doesn't say what happens with openal-soft and pulse,
<br>> though I don't see why it wouldn't fallback to something else if pulse isn't
<br>> actually running).
<br><br>The 'openal-soft' package merely contains the README, config and
<br>openal-info binary. libopenal.so.1 is in a separate package that
<br>only contains the library as per library packaging policy.
<br><br>> Does SuperTuxKart freeze on startup, or during play? If it's on startup, it
<br>> sounds like it might be hitting a race condition.
<br><br>Yes, I too think it's a race. SuperTuxKart locks up on startup,
<br>even openal-info locks up sometimes.
<br><br>cu
<br>Ludwig
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<br>> Users report that supertuxkart even crashes if pulseaudio is not
<br>> installed (ie only the lib but not the daemon):
<br>> <a href="https://bugzilla.novell.com/show_bug.cgi?id=557537" target="_top" rel="nofollow">https://bugzilla.novell.com/show_bug.cgi?id=557537</a><br>> I couldn't reproduce the crash but rather see supertuxkart and
<br>> openal-info lock up. Pulseaudio version is 0.9.19.
<br><br>I'm becoming convinced PulseAudio doesn't have a proper way to initialize a
<br>stream, that won't leave dangling signals waiting to be accepted or risk a
<br>race condition.
<br><br>Seems the report of the crash wasn't with openal-soft, though. Comment 11 says
<br>that openal-soft wasn't installed, and installing it and configuring to use
<br>alsa makes it work fine (doesn't say what happens with openal-soft and pulse,
<br>though I don't see why it wouldn't fallback to something else if pulse isn't
<br>actually running).
<br><br>Does SuperTuxKart freeze on startup, or during play? If it's on startup, it
<br>sounds like it might be hitting a race condition.
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<br><br>Users report that supertuxkart even crashes if pulseaudio is not
<br>installed (ie only the lib but not the daemon):
<br><a href="https://bugzilla.novell.com/show_bug.cgi?id=557537" target="_top" rel="nofollow">https://bugzilla.novell.com/show_bug.cgi?id=557537</a><br>I couldn't reproduce the crash but rather see supertuxkart and
<br>openal-info lock up. Pulseaudio version is 0.9.19.
<br><br>cu
<br>Ludwig
<br><br>--
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<div class='shrinkable-quote'><br>> Chris, you say
<br>>
<br>> > One way to do it would be to set the source property AL_SOURCE_RELATIVE
<br>> > to AL_TRUE and AL_REFERENCE_DISTANCE to 1. Then you can use the source's
<br>> > 3D position to set it where a speaker should be. Such as 0,0,-1, which
<br>> > would place the sound where the front-center speaker would be.
<br>>
<br>> I was thinking on using a similar approach, however I could not find any
<br>> info on speaker location coordinates. You said, 0,0,-1 is a front center.
<br>> Is there any info available on where the rest of the speakers will be ?
</div><br>Here is a page that mentions the default positioning for some surround sound
<br>setups:
<br><a href="http://en.wikipedia.org/wiki/Surround_sound" target="_top" rel="nofollow">http://en.wikipedia.org/wiki/Surround_sound</a><br><br>Though the idea here wouldn't be putting the source right on the wanted
<br>speaker, so much as it is putting the source on a "virtual" speaker and openal
<br>will pan to make it sound like it's coming from there, whether there's a
<br>speaker or not. Eg. if you want the sound to come from the back-left, put the
<br>source at {-0.707, 0, 0.707} for -135deg, or for front-right at {0.707, 0,
<br>-0.707} for +45deg.
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26569095Re: Sending an effect to a particular speaker of sb5.12009-11-29T19:18:27Z2009-11-29T19:18:27ZChris Robinson-5On Sunday 29 November 2009 9:07:31 am Oleksiy Frolov wrote:
<br>> Thank you Kris
<br>>
<br>> > Another way would be to make a 5.1, 6.1, or 7.1 buffer and place the mono
<br>> > data in one channel, leaving the others silent. This has the same benefit
<br>> > as above (input channels that are missing an output are virtualized) and
<br>> > it will work with the LFE channel, but those formats aren't always
<br>> > available.
<br>>
<br>> But this will not allow for the effect to be used, correct ?
<br><br>It won't be guaranteed for EFX effects to work with them, no. IIRC, some newer
<br>hardware can enable effects on multi-channel streams, and the latest Git
<br>version of OpenAL Soft can pass multi-channel streams to the effects, though
<br>in OpenAL Soft's case it's down-mixed to mono before processing.
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<br>> Just wondering if one can send an effect to a particular channel of the
<br>> SB5.1 compatible card. So far it seems the effects can only be used to
<br>> work on the mono channels, and to be sent to the speakers using the 3D
<br>> positioning. Is there a way however to route a mono channel (or effect
<br>> output) to a particular speaker (no 3D) ?
<br><br>One way to do it would be to set the source property AL_SOURCE_RELATIVE to
<br>AL_TRUE and AL_REFERENCE_DISTANCE to 1. Then you can use the source's 3D
<br>position to set it where a speaker should be. Such as 0,0,-1, which would
<br>place the sound where the front-center speaker would be.
<br><br>Another way would be to make a 5.1, 6.1, or 7.1 buffer and place the mono data
<br>in one channel, leaving the others silent. This has the same benefit as above
<br>(input channels that are missing an output are virtualized) and it will work
<br>with the LFE channel, but those formats aren't always available.
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26562245Re: Changing the refresh rate of OpenAL2009-11-29T05:48:21Z2009-11-29T05:48:21ZChris Robinson-5On Sunday 29 November 2009 4:26:16 am Oleksiy Frolov wrote:
<br>> There was a statement earlier in the mailing list that OpenAL is not for
<br>> a low latency applications. But I don't see why one could not make it mix
<br>> faster (and consume more CPU), when necessary - to achieve a lower
<br>> propagation times ?
<br><br>Hi.
<br><br>The full delay/latency introduced by OpenAL is not exposed or settable through
<br>the API. The ALC_REFRESH parameter is the number of times it updates per
<br>second (or indirectly, a rough estimate of the period size with software
<br>mixing). However, that doesn't say anything about the delay between a command
<br>getting issued and it becoming audible.
<br><br>Increasing the number of updates per second won't necessarily affect the
<br>delay.. eg. an ALC_REFRESH of 20, with a buffer comprised of 3 periods,
<br>compared to an ALC_REFRESH of 40, with a buffer of 6 periods. The latter has
<br>twice as many updates per second, and will be more responsive, but the overall
<br>latency is still roughly the same.
<br><br>Currently, OpenAL Soft does not support setting the ALC_REFRESH attribute.
<br>However, there are changes coming that should make it possible to take the
<br>default period and buffer sizes down, noticeably decreasing latency (some of
<br>it is already in place in the latest Git/SVN). You can change the buffer and
<br>period size settings with a config file, though. See here:
<br><a href="http://repo.or.cz/w/openal-soft.git/blob/HEAD:/alsoftrc.sample" target="_top" rel="nofollow">http://repo.or.cz/w/openal-soft.git/blob/HEAD:/alsoftrc.sample</a><br>_______________________________________________
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<br><br> There was a statement earlier in the mailing list that OpenAL is not for
<br>a low latency applications. But I don't see why one could not make it mix
<br>faster (and consume more CPU), when necessary - to achieve a lower
<br>propagation times ?
<br><br> However, when I try to do so - specify the different refresh rate, like
<br><br> int attrlist[] = { ALC_REFRESH, 50, ALC_INVALID };
<br> ctx = alcCreateContext(dev[0], attrlist);
<br><br>the refresh rate does not change. It always stays at 40 (or 43 for openAL
<br>soft) at my windows XP.
<br><br>Any idea if this parameter can be controlled in some other way ?
<br><br>Thank you
<br><br>regards,
<br>Oleksiy
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<br><br> Just wondering if one can send an effect to a particular channel of the
<br>SB5.1 compatible card. So far it seems the effects can only be used to
<br>work on the mono channels, and to be sent to the speakers using the 3D
<br>positioning. Is there a way however to route a mono channel (or effect
<br>output) to a particular speaker (no 3D) ?
<br><br>I have tried the CHANNEL_MASK variable, but there seems to be no effect.
<br><br>Thank you
<br>regards,
<br>Oleksiy
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26550495Re: AL_EXT_source_distance_model revisit2009-11-27T20:39:23Z2009-11-27T20:39:23ZChris Robinson-5On Tuesday 20 October 2009 10:39:59 am Chris Robinson wrote:
<div class='shrinkable-quote'><br>> Or perhaps another option I just thought of.. have an alEnable/alDisable
<br>> context state for per-source distance models. When disabled (default) the
<br>> context's model is used, otherwise the source's model is. Then
<br>> alDistanceModel has no explicit effect on source state, but the enable
<br>> says which should be used. Eg:
<br>>
<br>> alSourcei(sID, AL_DISTANCE_MODEL, AL_LINEAR_DISTANCE_CLAMPED);
<br>> alDistanceModel(AL_NONE);
<br>> ... AL_NONE is used for all sources ...
<br>>
<br>> alEnable(AL_SOURCE_DISTANCE_MODEL);
<br>> ... now linear distance clamped is used for sID, inverse distance clamped
<br>> for other sources ...
<br>>
<br>> alDisable(AL_SOURCE_DISTANCE_MODEL);
<br>> ... now AL_NONE is used for all sources ...
<br>>
<br>> alGetSourceiv(sID, AL_DISTANCE_MODEL, &val);
<br>> ... gives val == AL_LINEAR_DISTANCE_CLAMPED ...
</div><br>I decided to switch over to this method, as it does provide a cleaner-looking
<br>addition (as opposed to unsavory side effects of alDistanceModel). It needed a
<br>new token name, though, which I tentatively added. I updated the spec page and
<br>the Git/SVN version of OpenAL Soft to work this way.
<br><br><a href="http://kcat.strangesoft.net/openal-extensions/EXT_source_distance_model.txt" target="_top" rel="nofollow">http://kcat.strangesoft.net/openal-extensions/EXT_source_distance_model.txt</a><br>_______________________________________________
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal-devel" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal-devel</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---Dev-f14242.html" embed="fixTarget[14242]" target="_top" >OpenAL - Dev</a></p>tag:old.nabble.com,2006:post-26549780Re: Where are the OpenAL dynamic or static libraries on MacOS 10.5.7 with with XCode 312?2009-11-27T17:28:35Z2009-11-27T17:28:35ZE. WingOn 11/27/09, "Alexander Günzel" <<a href="http://old.nabble.com/user/SendEmail.jtp?type=post&post=26549780&i=0" target="_top" rel="nofollow">awg@...</a>> wrote:
<div class='shrinkable-quote'><br>> Hello especially to E. Wing,
<br>>
<br>> who gave a wonderful answer to Luca Brayda in the thread "[Openal]
<br>> cannot find openal 1.1 for MacOSX" in November 2009. This helped me
<br>> to find the openal include files. But at the same location I can't
<br>> find the dynamic or static OpenAl libraries, which I need for let my
<br>> linker do it's work. It always complains about unresolved symbols
<br>> from OpenAL functions.
<br>>
<br>> So my question is:
<br>> In which path do I find the dynamic or static OpenAl libraries under
<br>> MacOS X 10.5.7 with XCode 312?
<br>>
</div><br>A .framework on OS X is a self-contained bundle that contains both
<br>header files and dynamic libraries (and sometimes extra resources) all
<br>in a single package. You want to link against that same
<br>OpenAL.framework I referred to in the previous email.
<br><br>In Xcode, the most common convention is to Ctrl-click on "External
<br>Frameworks and Libraries" in the Groups & Files panel to bring up a
<br>contextual menu and do Add->Existing Frameworks.
<br><br>Then look for the OpenAL.framework. Hopefully you'll only see one
<br>entry. If you see multiple, it probably means you installed a 3rd
<br>party version somewhere which might mess you up. You'll need to guess
<br>which is the correct one. Lastly, you need to add it to the correct
<br>target in your Xcode project if you have multiple build targets. To
<br>verify, select your desired target as the active build target, click
<br>on the
<br>"External Frameworks and Libraries" to highlight the group and in the
<br>main-right-side view, select the "Details" tab, and look for the
<br>OpenAL.framework and make sure the checkbox is checked.
<br><br><br>> I also installed the package "OpenAL_Installer_OSX.dmg", but it ended
<br>> silently and so I don't know, what it did.
<br><br>Hopefully it didn't do anything. You shouldn't be installing anything
<br>like this. Where did you get this? Through the years, I've been
<br>getting odd questions about linking problems with OpenAL on OS X and
<br>its always the case that somebody installed a 3rd party OpenAL which
<br>was built wrong or really old that they were linking to instead of the
<br>system supplied one. Everyone claims they never installed it even
<br>though its sitting right there on their system, but it had to come
<br>from somewhere, and I've been wanting to know where its been coming
<br>from.
<br><br>Make sure you don't have an OpenAL.framework in /Library/Frameworks or
<br>~/Library/Frameworks.
<br><br>-Eric
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26547132Where are the OpenAL dynamic or static libraries on MacOS 10.5.7 with with XCode 312?2009-11-27T11:50:23Z2009-11-27T11:50:23ZAlexander GünzelHello especially to E. Wing,
<br><br>who gave a wonderful answer to Luca Brayda in the thread "[Openal]
<br>cannot find openal 1.1 for MacOSX" in November 2009. This helped me
<br>to find the openal include files. But at the same location I can't
<br>find the dynamic or static OpenAl libraries, which I need for let my
<br>linker do it's work. It always complains about unresolved symbols
<br>from OpenAL functions.
<br><br>So my question is:
<br>In which path do I find the dynamic or static OpenAl libraries under
<br>MacOS X 10.5.7 with XCode 312?
<br><br>I also installed the package "OpenAL_Installer_OSX.dmg", but it ended
<br>silently and so I don't know, what it did.
<br><br>Hope anybody can help me with this? I think there should be others,
<br>who also develop on MacOS X with OpenAL in C or C++, so they also
<br>need to know, where the libraries are located?
<br>Any help is appreciated
<br> Alexander
<br><br>--
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<br><br>i have developed a PC application that stream and receive audio to a
<br>remote embedded device, in an half duplex fashon.
<br>Everything works quite fine now, except for a little problem:
<br>I have the following operation sequence:
<br>TX1) I start to capture and sending audio chunks to the remote device.
<br>RX1) I stop to capture, clear someway captured samples, and set the PC
<br>application in RX mode.
<br>TX2) I start to capture again, and sending udio chunks to the remote device.
<br><br>The second time i start to capture and send (TX2), seems i am sending
<br>still a chunk of old session TX1.
<br><br>I try to add some code:
<br><br>I open the capture device at application startup.
<br><br>TX ()
<br>{
<br> alcCaptureStart( capture );
<br><br> AudioThread (true);
<br>}
<br><br>audio thread read and send now
<br><br>RX ()
<br>{
<br> if (capture)
<br> {
<br> alcCaptureStop (capture);
<br><br> ALCint remainder;
<br><br> alcGetIntegerv (capture, ALC_CAPTURE_SAMPLES, 1, &remainder);
<br><br> int block;
<br><br> while (remainder > 0)
<br> {
<br> block = (remainder)>512?512:remainder;
<br><br> alcCaptureSamples (capture, &buffsamples[OFS_PLD], block);
<br><br> remainder -= block;
<br> }
<br><br> /**
<br> * this clear every AL error, so that next "alut" functions don't
<br>fail,
<br> * in particular "alutCreateBufferFromFile" need a clean start.
<br> */
<br> alcGetError (capture);
<br> }
<br><br> .... RX init code
<br>}
<br><br>Is there a way to be sure i am not reading/capturing old samples still
<br>in AL buffer from the previous capture session ?
<br><br><br>many thanks in advice,
<br>Angelo
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26528195Re: iPhone OpenAL implementation2009-11-26T03:35:54Z2009-11-26T03:35:54ZE. WingAs far as I know, OpenAL on iPhone currently does not support any
<br>effects outside the standard effects required by the 1.1 spec.
<br><br><a href="http://developer.apple.com/iPhone/library/technotes/tn2008/tn2199.html#//apple_ref/doc/uid/DTS40007999" target="_top" rel="nofollow">http://developer.apple.com/iPhone/library/technotes/tn2008/tn2199.html#//apple_ref/doc/uid/DTS40007999</a><br><br>-Eric
<br><br>On 11/25/09, Greg Rahn <<a href="http://old.nabble.com/user/SendEmail.jtp?type=post&post=26528195&i=0" target="_top" rel="nofollow">g@...</a>> wrote:
<div class='shrinkable-quote'><br>> Hi,
<br>> I am creating audio games for the iPhone and would like to know if
<br>> the iPhone implements Open AL features like HRTF from a mono source.
<br>> Specifically, I want to play stereo binaural sound files for the
<br>> environment, and have mono emitters processed with 3d audio techniques
<br>> such as HRTF, doppler, etc. Perhaps someone could point me to
<br>> documentation?
<br>>
<br>> Kind regards,
<br>>
<br>> Greg
<br>>
<br>> _______________________________________________
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<br>> <a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br>>
</div>_______________________________________________
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26528158Re: cannot find openal 1.1 for MacOSX2009-11-26T03:31:55Z2009-11-26T03:31:55ZE. WingOn 11/26/09, Luca Brayda <<a href="http://old.nabble.com/user/SendEmail.jtp?type=post&post=26528158&i=0" target="_top" rel="nofollow">luca.brayda@...</a>> wrote:
<br>> Hi,
<br>> can anybody help me in finding openal 1.1 for MacOSX? It seems that
<br>> the package on the Creative website are for PowerPC only (I'm
<br>> referring to file OpenAL_Installer_OSX
<br><br>OpenAL is a standard/built-in component on OS X since 2005. Assuming
<br>you are running 10.4 or greater, it is located in
<br>/System/Library/Frameworks/OpenAL.framework.
<br><br>-Eric
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26526937cannot find openal 1.1 for MacOSX2009-11-26T01:49:23Z2009-11-26T01:49:23ZLuca BraydaHi,
<br>can anybody help me in finding openal 1.1 for MacOSX? It seems that
<br>the package on the Creative website are for PowerPC only (I'm
<br>referring to file OpenAL_Installer_OSX<br /> <br />), while the SDK is for Windows only (I'm referring to file
<br>OpenAL11CoreSDK<br /> <br />). I tried with macports, but only version 1.0 is available, and the
<br>openal svn repository seems broken.
<br>Thank you.
<br><br><br>--
<br><br>Luca
<br><br><br><br><br><br><br><br><br />_______________________________________________
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<br>> I don't know whether number 10 or number 1 is the default that will get
<br>> used...but device number 11 is oss I think.
<br><br>For me, PortAudio wouldn't pick a default device (the function that's supposed
<br>to return the index gives me -1), although forcing openal to use 10 in the
<br>config file works. So I don't know what PortAudio's method is for determining
<br>the default.
<br><br>> Anyhow the device does seem to close properly, so possibly it's a stall.
<br>> With the default period size this doesn't happen. I guess I wasn't sure
<br>> what this symptom was. If it's the mixer choking then I suppose that's
<br>> kind of normal and there's nothing I can do about it....perhaps I just
<br>> expected it to fail differently somehow.
<br><br>I can probably be a little more verbose when it stalls, but it is supposed to
<br>restore itself when it does (and if you're using 1.9/1.10, it probably is,
<br>otherwise it would give you a disconnection notification and print something).
<br>What's likely happening is that it keeps stalling, but because it restores
<br>successfully, it doesn't say or do anything more about it.
<br><br>I can try adding some logic so that if it continuously stalls within a short
<br>amount of time, it forces a disconnect. Although I don't think it will be
<br>necessary with the coming processing and priority changes.
<br>_______________________________________________
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<br><a href="http://old.nabble.com/user/SendEmail.jtp?type=post&post=26523194&i=0" target="_top" rel="nofollow">Openal-devel@...</a>
<br><a href="http://opensource.creative.com/mailman/listinfo/openal-devel" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal-devel</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---Dev-f14242.html" embed="fixTarget[14242]" target="_top" >OpenAL - Dev</a></p>tag:old.nabble.com,2006:post-26522853Re: ALSA hangs with smaller period size2009-11-25T16:43:25Z2009-11-25T16:43:25ZPierre Proske-2I'm not sure what PortAudio uses by default either...I dug up an old
<br>PortAudio app and enumerated the devices:
<br>Device number: 0 Name: HDA Intel: ALC268 Analog (hw:0,0)
<br>MaxInputChannels: 2 MaxOuputChannels: 2
<br>Default sample rate: 44100.000000
<br><br>Device number: 1 Name: HDA Intel: ALC268 Analog (hw:0,2)
<br>MaxInputChannels: 2 MaxOuputChannels: 0
<br>Default sample rate: 44100.000000
<br><br>Device number: 2 Name: HDA Intel: NVIDIA HDMI (hw:0,3)
<br>MaxInputChannels: 0 MaxOuputChannels: 8
<br>Default sample rate: 48000.000000
<br><br>Device number: 3 Name: front
<br>MaxInputChannels: 0 MaxOuputChannels: 2
<br>Default sample rate: 44100.000000
<br><br>Device number: 4 Name: surround40
<br>MaxInputChannels: 0 MaxOuputChannels: 2
<br>Default sample rate: 44100.000000
<br><br>Device number: 5 Name: surround51
<br>MaxInputChannels: 0 MaxOuputChannels: 2
<br>Default sample rate: 44100.000000
<br><br>Device number: 6 Name: surround71
<br>MaxInputChannels: 0 MaxOuputChannels: 2
<br>Default sample rate: 44100.000000
<br><br>Device number: 7 Name: hdmi
<br>MaxInputChannels: 0 MaxOuputChannels: 8
<br>Default sample rate: 48000.000000
<br><br>Device number: 8 Name: pulse
<br>MaxInputChannels: 32 MaxOuputChannels: 32
<br>Default sample rate: 44100.000000
<br><br>Device number: 9 Name: dmix
<br>MaxInputChannels: 0 MaxOuputChannels: 2
<br>Default sample rate: 48000.000000
<br><br>Device number: 10 Name: default
<br>MaxInputChannels: 32 MaxOuputChannels: 32
<br>Default sample rate: 44100.000000
<br><br>Device number: 11 Name: /dev/dsp
<br>MaxInputChannels: 16 MaxOuputChannels: 16
<br>Default sample rate: 44100.000000
<br>Type sound card number: 11
<br><br>I don't know whether number 10 or number 1 is the default that will get
<br>used...but device number 11 is oss I think.
<br><br>Anyhow the device does seem to close properly, so possibly it's a stall.
<br>With the default period size this doesn't happen. I guess I wasn't sure
<br>what this symptom was. If it's the mixer choking then I suppose that's
<br>kind of normal and there's nothing I can do about it....perhaps I just
<br>expected it to fail differently somehow.
<br><br>Thanks
<br><br>Chris Robinson wrote:
<div class='shrinkable-quote'><br>> On Wednesday 25 November 2009 6:32:49 am Pierre Proske wrote:
<br>>
<br>>> I'm using the OpenAL-soft on linux and it seems that when I set the
<br>>> period size to 256 in the config file while using alsa, my application
<br>>> starts up and plays sound for a couple of seconds before hanging. If I
<br>>> use Portaudio, I don't have this problem. I'm just curious if PortAudio
<br>>> uses Alsa by default (I think it does), and if so, whether this problem
<br>>> could be fixed.
<br>>>
<br>>
<br>> Hi. I'm not sure what PortAudio uses by default. It might be OSS, but it's
<br>> probably system/version dependent.
<br>>
<br>> As for the sound hanging, does the device still close properly? If it does,
<br>> then it sounds like it's just stalling, which could be a problem with CPU load
<br>> (a period size of 256 without an adjusted period count might not leave enough
<br>> of a buffer to let the mixer keep up with everything, since it doesn't have
<br>> real-time prio).
<br>>
<br>> Otherwise, if it is a full deadlock on the thread, it still might be size- and
<br>> speed-related. Having a backtrace of the mixer thread would be helpful.
<br>> _______________________________________________
<br>> Openal-devel mailing list
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<br>>
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal-devel" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal-devel</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---Dev-f14242.html" embed="fixTarget[14242]" target="_top" >OpenAL - Dev</a></p>tag:old.nabble.com,2006:post-26521562Re: ALSA hangs with smaller period size2009-11-25T14:38:45Z2009-11-25T14:38:45ZChris Robinson-5On Wednesday 25 November 2009 6:32:49 am Pierre Proske wrote:
<br>> I'm using the OpenAL-soft on linux and it seems that when I set the
<br>> period size to 256 in the config file while using alsa, my application
<br>> starts up and plays sound for a couple of seconds before hanging. If I
<br>> use Portaudio, I don't have this problem. I'm just curious if PortAudio
<br>> uses Alsa by default (I think it does), and if so, whether this problem
<br>> could be fixed.
<br><br>Hi. I'm not sure what PortAudio uses by default. It might be OSS, but it's
<br>probably system/version dependent.
<br><br>As for the sound hanging, does the device still close properly? If it does,
<br>then it sounds like it's just stalling, which could be a problem with CPU load
<br>(a period size of 256 without an adjusted period count might not leave enough
<br>of a buffer to let the mixer keep up with everything, since it doesn't have
<br>real-time prio).
<br><br>Otherwise, if it is a full deadlock on the thread, it still might be size- and
<br>speed-related. Having a backtrace of the mixer thread would be helpful.
<br>_______________________________________________
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal-devel" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal-devel</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---Dev-f14242.html" embed="fixTarget[14242]" target="_top" >OpenAL - Dev</a></p>tag:old.nabble.com,2006:post-26520685iPhone OpenAL implementation2009-11-25T13:27:25Z2009-11-25T13:27:25ZGreg RahnHi,
<br>I am creating audio games for the iPhone and would like to know if
<br>the iPhone implements Open AL features like HRTF from a mono source.
<br>Specifically, I want to play stereo binaural sound files for the
<br>environment, and have mono emitters processed with 3d audio techniques
<br>such as HRTF, doppler, etc. Perhaps someone could point me to
<br>documentation?
<br><br>Kind regards,
<br><br>Greg
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---User-f14244.html" embed="fixTarget[14244]" target="_top" >OpenAL - User</a></p>tag:old.nabble.com,2006:post-26519004Re: Learning OpenAL2009-11-25T11:30:25Z2009-11-25T11:30:25ZKip WarnerOn Wed, 2009-11-25 at 12:58 -0500, Jason Daly wrote:
<br>> No problem. I can't imagine why none of us brought it up in August
<br>> when
<br>> you asked the first time :-)
<br>>
<br>> --"J"
<br><br>Surprised you even remembered!
<br><br>--
<br>Kip Warner -- Software Developer
<br>President & CEO Kshatra Corp.
<br>OpenPGP encrypted/signed mail preferred
<br><a href="http://www.thevertigo.com" target="_top" rel="nofollow">http://www.thevertigo.com</a><br><br /> <br />_______________________________________________
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<br>> Thanks Jason. I should have looked at Creative's stuff first.
<br>>
<br>>
<br><br>No problem. I can't imagine why none of us brought it up in August when
<br>you asked the first time :-)
<br><br>--"J"
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<br><br>I'm using the OpenAL-soft on linux and it seems that when I set the
<br>period size to 256 in the config file while using alsa, my application
<br>starts up and plays sound for a couple of seconds before hanging. If I
<br>use Portaudio, I don't have this problem. I'm just curious if PortAudio
<br>uses Alsa by default (I think it does), and if so, whether this problem
<br>could be fixed.
<br><br>best,
<br>Pierre
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<br><a href="http://opensource.creative.com/mailman/listinfo/openal-devel" target="_top" rel="nofollow">http://opensource.creative.com/mailman/listinfo/openal-devel</a><br><p>From forum: <a href="http://old.nabble.com/OpenAL---Dev-f14242.html" embed="fixTarget[14242]" target="_top" >OpenAL - Dev</a></p>tag:old.nabble.com,2006:post-26506541Re: Learning OpenAL2009-11-24T18:04:22Z2009-11-24T18:04:22ZKip WarnerOn Tue, 2009-11-24 at 18:10 -0500, Jason Daly wrote:
<div class='shrinkable-quote'><div class='shrinkable-quote'><br>> Hi, Kip,
<br>>
<br>> Probably the most comprehensive document put out about OpenAL is the
<br>> OpenAL Programmer's Guide by Creative. You can find it here:
<br>>
<br>> <a href="http://connect.creativelabs.com/openal/Documentation/Forms/AllItems.aspx" target="_top" rel="nofollow">http://connect.creativelabs.com/openal/Documentation/Forms/AllItems.aspx</a><br>>
<br>>
<br>> That page also has the formal specifications for OpenAL and ALUT.
<br>>
<br>>
<br>> Hope this helps...
<br>>
<br>> --"J"
</div></div>Thanks Jason. I should have looked at Creative's stuff first.
<br><br>--
<br>Kip Warner -- Software Developer
<br>President & CEO Kshatra Corp.
<br>OpenPGP encrypted/signed mail preferred
<br><a href="http://www.thevertigo.com" target="_top" rel="nofollow">http://www.thevertigo.com</a><br><br /> <br />_______________________________________________
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