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* Partially revert "Use a different method for HRTF mixing"Chris Robinson2014-11-231-2/+23
| | | | | | | | | | | | The sound localization with virtual channel mixing was just too poor, so while it's more costly to do per-source HRTF mixing, it's unavoidable if you want good localization. This is only partially reverted because having the virtual channel is still beneficial, particularly with B-Format rendering and effect mixing which otherwise skip HRTF processing. As before, the number of virtual channels can potentially be customized, specifying more or less channels depending on the system's needs.
* Rename Voice's NumChannels to OutChannelsChris Robinson2014-11-221-1/+1
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* Store the number of output channels in the voiceChris Robinson2014-11-221-1/+1
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* Remove an unnecessary union containerChris Robinson2014-11-221-1/+1
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* Use a different method for HRTF mixingChris Robinson2014-11-221-23/+2
| | | | | | | | | | | | | | | | | | | | | | | This new method mixes sources normally into a 14-channel buffer with the channels placed all around the listener. HRTF is then applied to the channels given their positions and written to a 2-channel buffer, which gets written out to the device. This method has the benefit that HRTF processing becomes more scalable. The costly HRTF filters are applied to the 14-channel buffer after the mix is done, turning it into a post-process with a fixed overhead. Mixing sources is done with normal non-HRTF methods, so increasing the number of playing sources only incurs normal mixing costs. Another benefit is that it improves B-Format playback since the soundfield gets mixed into speakers covering all three dimensions, which then get filtered based on their locations. The main downside to this is that the spatial resolution of the HRTF dataset does not play a big role anymore. However, the hope is that with ambisonics- based panning, the perceptual position of panned sounds will still be good. It is also an option to increase the number of virtual channels for systems that can handle it, or maybe even decrease it for weaker systems.
* Rename speakers to channels, and remove an old incorrect commentChris Robinson2014-11-071-1/+1
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* Use a separate macro for the max output channel countChris Robinson2014-11-071-1/+1
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* Use the copy resampler only when there's no sub-sample offsetChris Robinson2014-11-021-7/+6
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* Add preliminary AL_EXT_BFORMAT supportChris Robinson2014-10-311-0/+17
| | | | | Currently missing the AL_ORIENTATION source property. Gain stepping also does not work.
* Rename activesource to voiceChris Robinson2014-08-211-9/+9
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* Use a NULL source for inactive activesourcesChris Robinson2014-08-211-2/+1
| | | | Also only access the activesource's source field once per update.
* Update COPYING to the latest ↵François Cami2014-08-181-2/+2
| | | | https://www.gnu.org/licenses/old-licenses/lgpl-2.0.txt to fix the FSF' address Fix the FSF' address in the source
* Make the source's buffer queue head and current queue item atomicChris Robinson2014-07-311-13/+14
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* Load soundfont samples into an ALbufferChris Robinson2014-06-291-15/+15
| | | | | Also remove ALsoundfont's now-unneeded sample storage functions and struct fields.
* Get the mixer and resampler functions when neededChris Robinson2014-06-131-12/+73
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* Combine the direct and send mixersChris Robinson2014-06-131-5/+5
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* Combine some dry and wet path typesChris Robinson2014-06-131-1/+1
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* Move InitiatePositionArrays to mixer_defs.hChris Robinson2014-06-061-0/+3
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* Avoid a loop when updating the source position variablesChris Robinson2014-06-021-6/+4
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* Move the active source's offset out of the direct paramsChris Robinson2014-05-241-2/+2
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* Use the current buffer item for static sources tooChris Robinson2014-05-211-1/+1
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* Properly process all samples with a bandpass filterChris Robinson2014-05-211-2/+2
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* Use the correct input for HRTF mixingChris Robinson2014-05-211-1/+1
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* Update the active source's direct and send properties after each mixChris Robinson2014-05-211-10/+9
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* Return a sample pointer from resamplersChris Robinson2014-05-191-7/+10
| | | | Both resampling and filtering now avoid copying samples when they no-op.
* Put per-channel filter properties togetherChris Robinson2014-05-191-11/+14
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* Return a sample pointer from DoFiltersChris Robinson2014-05-191-14/+18
| | | | | This allows us to avoid copying samples when no filtering is needed. Doing the same for resampling would require another temporary buffer in the device.
* Move an HRTF mixer parameter and shorten a couple variable namesChris Robinson2014-05-181-21/+17
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* Don't pass the SendParams to the wet-path mixerChris Robinson2014-05-181-1/+3
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* Don't pass the DirectParams to the dry-path mixerChris Robinson2014-05-181-2/+3
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* Use different parameters for HRTF mixersChris Robinson2014-05-181-3/+12
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* Pass some DirectParams as function parametersChris Robinson2014-05-181-1/+3
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* Add a ALfilterState method to process multiple samples at onceChris Robinson2014-05-181-9/+11
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* Apply high-pass source filters as neededChris Robinson2014-05-171-5/+20
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* Add a flag to specify when the low-pass filter needs to applyChris Robinson2014-05-171-8/+17
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* Ensure that LoopEnd > LoopStartChris Robinson2014-05-151-0/+1
| | | | | | For the benefit of Clang's static analysis, which doesn't know that a static source will always have a valid buffer and a buffer must have a non-0 loop range.
* Store the current buffer queue item, rather than played buffer countChris Robinson2014-05-101-22/+11
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* Avoid checking the previous buffer multiple timesChris Robinson2014-05-101-9/+9
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* Remove an unnecessary conditionalChris Robinson2014-03-231-7/+1
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* Remove the last bits of the predictive sample processingChris Robinson2014-03-231-3/+1
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* Remove the click removal buffers for auxiliary effect slotsChris Robinson2014-03-231-2/+1
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* Remove the now-unneeded click removal buffers for the deviceChris Robinson2014-03-231-2/+1
| | | | | | They are still there for auxiliary sends. However, they should go away soon enough too, and then we won't have to mess around with calculating extra "predictive" samples in the mixer.
* Step mixing gains per-sample for non-HRTF mixingChris Robinson2014-03-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | This fades the dry mixing gains using a logarithmic curve, which should produce a smoother transition than a linear one. It functions similarly to a linear fade except that step = (target - current) / numsteps; ... gain += step; becomes step = powf(target / current, 1.0f / numsteps); ... gain *= step; where 'target' and 'current' are clamped to a lower bound that is greater than 0 (which makes no sense on a logarithmic scale). Consequently, the non-HRTF direct mixers do not do not feed into the click removal and pending click buffers, as this per-sample fading would do an adequate job of stopping clicks and pops caused by extreme gain changes. These buffers should be removed shortly.
* Move the step counter and moving flag to DirectParamsChris Robinson2014-03-231-3/+3
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* Store the HrtfState directly in the DirectParamsChris Robinson2014-03-231-4/+4
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* Store some source mixing parameters in the active source structChris Robinson2014-03-191-10/+11
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* Fix a commentChris Robinson2013-10-261-1/+1
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* Don't store the effect slot in SendParamsChris Robinson2013-10-061-1/+1
| | | | This makes it much more like DirectParams.
* Rename Filter param member to LpFilterChris Robinson2013-10-061-2/+2
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* Use C99's inline instead of __inlineChris Robinson2013-05-281-3/+3
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