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* Store the HRTF coeffs as a stereo pairChris Robinson2017-04-071-2/+2
| | | | | This will make it easier to handle HRTF data sets that have separate left and right ear responses. Will need an mhr version update to take advantage of that.
* Reference count HRTFs and unload them when unusedChris Robinson2017-04-061-0/+5
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* Load HRTF files as neededChris Robinson2017-04-051-6/+3
| | | | | Currently only applies to external files, rather than embedded datasets. Also, HRTFs aren't unloaded after being loaded, until library shutdown.
* Store the loaded hrtf entry container in the enumerated hrtf entryChris Robinson2017-04-051-9/+17
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* Store the HRTF's filename separate from the entry storageChris Robinson2017-04-051-3/+0
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* Load HRTF coefficients as pre-normalized floatsChris Robinson2017-03-311-1/+1
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* Rework HRTF coefficient fadingChris Robinson2017-03-111-1/+1
| | | | | | | | | | | | | | | This improves fading between HRIRs as sources pan around. In particular, it improves the issue with individual coefficients having various rounding errors in the stepping values, as well as issues with interpolating delay values. It does this by doing two mixing passes for each source. First using the last coefficients that fade to silence, and then again using the new coefficients that fade from silence. When added together, it creates a linear fade from one to the other. Additionally, the gain is applied separately so the individual coefficients don't step with rounding errors. Although this does increase CPU cost since it's doing two mixes per source, each mix is a bit cheaper now since the stepping is simplified to a single gain value, and the overall quality is improved.
* Allocate as many channels for DirectHrtfState as neededChris Robinson2017-03-111-1/+1
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* Move the B-Format HRTF virtual speaker stuff to InitHrtfPanningChris Robinson2017-01-181-15/+12
| | | | | This keeps the decoder matrices and coefficient mapping together for if it changes in the future.
* Use ALsizei for sizes and offsets with the mixerChris Robinson2017-01-161-3/+3
| | | | | | Unsigned 32-bit offsets actually have some potential overhead on 64-bit targets for pointer/array accesses due to rules on integer wrapping. No idea how much impact it has in practice, but it's nice to be correct about it.
* Use second-order ambisonics for basic HRTF renderingChris Robinson2017-01-151-1/+1
| | | | | | This should improve positional quality for relatively low cost. Full HRTF rendering still only uses first-order since the only use of the dry buffer there is for first-order content (B-Format buffers, effects).
* Don't interpolate between nearest HRIRsChris Robinson2016-10-091-1/+1
| | | | | | | | It still fades between HRIRs when it changes, but now it selects the nearest one instead of blending the nearest four. Due to the minimum-phase nature of the HRIRs, interpolating between delays lead to some oddities which are exasperated by the fading (and the fading is needed to avoid clicks and pops, and smooth out changes).
* Decode directly from B-Format to HRTF instead of a cubeChris Robinson2016-08-111-0/+7
| | | | | | | | | | | | | | | | | | | | | Last time this attempted to average the HRIRs according to their contribution to a given B-Format channel as if they were loudspeakers, as well as averaging the HRIR delays. The latter part resulted in the loss of the ITD (inter-aural time delay), a key component of HRTF. This time, the HRIRs are averaged similar to above, except instead of averaging the delays, they're applied to the resulting coefficients (for example, a delay of 8 would apply the HRIR starting at the 8th sample of the target HRIR). This does roughly double the IR length, as the largest delay is about 35 samples while the filter is normally 32 samples. However, this is still smaller the original data set IR (which was 256 samples), it also only needs to be applied to 4 channels for first-order ambisonics, rather than the 8-channel cube. So it's doing twice as much work per sample, but only working on half the number of samples. Additionally, since the resulting HRIRs no longer rely on an extra delay line, a more efficient HRTF mixing function can be made that doesn't use one. Such a function can also avoid the per-sample stepping parameters the original uses.
* Avoid function calls to get the HRTF sample rate and IR sizeChris Robinson2016-07-071-4/+14
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* Improve radius behavior with scaling of ambisonic coefficientsChris Robinson2016-04-241-1/+1
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* Remove an unused declarationChris Robinson2016-02-201-2/+0
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* Include the HRTF filename in the HRTF memory chunkChris Robinson2016-02-201-1/+0
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* Use an 8-channel cube for HRTF's virtual format.Chris Robinson2016-02-201-1/+0
| | | | | | There were phase issues caused by applying HRTF directly to the B-Format channels, since the HRIR delays were all averaged which removed the inter-aural time-delay, which in turn removed significant spatial information.
* Calculate HRTF stepping params right before mixingChris Robinson2016-02-141-1/+0
| | | | | This means we track the current params and the target params, rather than the target params and the stepping. This closer matches the non-HRTF mixers.
* Don't pass the channel count to GetBFormatHrtfCoeffsChris Robinson2016-02-091-1/+1
| | | | Since it's hard-coded anyway, there's no need to specify it.
* Use the enumerated HRTF list for selecting an HRTFChris Robinson2015-10-061-5/+4
| | | | Also report the proper specifier of the one currently in use.
* Store the Hrtf struct with the corresponding HrtfEntryChris Robinson2015-10-061-0/+2
| | | | | Also store the filename with the Hrtf struct so it can be reused for multiple HrtfEntry objects.
* Enumerate and list HRTFs per-deviceChris Robinson2015-10-061-0/+9
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* Allow the hrtf_tables option to be device-specificChris Robinson2015-09-201-2/+4
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* Calculate HRTF coefficients for all B-Format channels at onceChris Robinson2015-02-101-1/+1
| | | | | | It's possible to calculate HRTF coefficients for full third-order ambisonics now, but it's still not possible to use them here without upmixing first-order content.
* Pass the (FuMa) channel number to GetBFormatHrtfCoeffsChris Robinson2015-02-101-1/+1
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* Use B-Format for HRTF's virtual output formatChris Robinson2015-02-091-0/+1
| | | | | | | | This adds the ability to directly decode B-Format with HRTF, though only first- order (WXYZ) for now. Second- and third-order would be easilly doable, however we'd need to be able to up-mix first-order content (from the BFORMAT2D and BFORMAT3D buffer formats) since it would be inappropriate to decode lower-order content with a higher-order decoder.
* Make CalcHrtfDelta more genericChris Robinson2014-11-241-1/+0
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* Partially revert "Use a different method for HRTF mixing"Chris Robinson2014-11-231-1/+3
| | | | | | | | | | | | 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.
* Use a different method for HRTF mixingChris Robinson2014-11-221-3/+1
| | | | | | | | | | | | | | | | | | | | | | | 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.
* Add a source radius property that determines the directionality of a soundChris Robinson2014-07-111-2/+2
| | | | | | | | | At 0 distance from the listener, the sound is omni-directional. As the source and listener become 'radius' units apart, the sound becomes more directional. With HRTF, an omni-directional sound is handled using 0-delay, pass-through filter coefficients, which is blended with the real delay and coefficients as needed to become more directional.
* Don't pass the device to HRTF methodsChris Robinson2014-06-201-2/+2
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* Move HRTF macros and function declarations to a separate headerChris Robinson2014-02-231-0/+28
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