diff options
Diffstat (limited to 'Alc/ALu.c')
| -rw-r--r-- | Alc/ALu.c | 59 |
1 files changed, 59 insertions, 0 deletions
@@ -1483,6 +1483,54 @@ static void UpdateContextSources(ALCcontext *ctx, const struct ALeffectslotArray } +static void ApplyStablizer(FrontStablizer *Stablizer, ALfloat (*restrict Buffer)[BUFFERSIZE], + int lidx, int ridx, int cidx, ALsizei SamplesToDo, + ALsizei NumChannels) +{ + ALfloat (*restrict lsplit)[BUFFERSIZE] = ASSUME_ALIGNED(Stablizer->LSplit, 16); + ALfloat (*restrict rsplit)[BUFFERSIZE] = ASSUME_ALIGNED(Stablizer->RSplit, 16); + ALsizei i; + + /* Apply an all-pass to all channels, except the front-left and front- + * right, so they maintain the same relative phase. + */ + for(i = 0;i < NumChannels;i++) + { + if(i == lidx || i == ridx) + continue; + splitterap_process(&Stablizer->APFilter[i], Buffer[i], SamplesToDo); + } + + bandsplit_process(&Stablizer->LFilter, lsplit[1], lsplit[0], Buffer[lidx], SamplesToDo); + bandsplit_process(&Stablizer->RFilter, rsplit[1], rsplit[0], Buffer[ridx], SamplesToDo); + + for(i = 0;i < SamplesToDo;i++) + { + ALfloat lfsum, hfsum; + ALfloat m, s, c; + + lfsum = lsplit[0][i] + rsplit[0][i]; + hfsum = lsplit[1][i] + rsplit[1][i]; + s = lsplit[0][i] + lsplit[1][i] - rsplit[0][i] - rsplit[1][i]; + + /* This pans the separate low- and high-frequency sums between being on + * the center channel and the left/right channels. The low-frequency + * sum is 1/3rd toward center (2/3rds on left/right) and the high- + * frequency sum is 1/4th toward center (3/4ths on left/right). These + * values can be tweaked. + */ + m = lfsum*cosf(1.0f/3.0f * F_PI_2) + hfsum*cosf(1.0f/4.0f * F_PI_2); + c = lfsum*sinf(1.0f/3.0f * F_PI_2) + hfsum*sinf(1.0f/4.0f * F_PI_2); + + /* The generated center channel signal adds to the existing signal, + * while the modified left and right channels replace. + */ + Buffer[lidx][i] = (m + s) * 0.5f; + Buffer[ridx][i] = (m - s) * 0.5f; + Buffer[cidx][i] += c * 0.5f; + } +} + static void ApplyDistanceComp(ALfloatBUFFERSIZE *restrict Samples, DistanceComp *distcomp, ALfloat *restrict Values, ALsizei SamplesToDo, ALsizei numchans) { @@ -1756,6 +1804,17 @@ void aluMixData(ALCdevice *device, ALvoid *OutBuffer, ALsizei NumSamples) ALfloat (*Buffer)[BUFFERSIZE] = device->RealOut.Buffer; ALsizei Channels = device->RealOut.NumChannels; + if(device->Stablizer) + { + int lidx = GetChannelIdxByName(device->RealOut, FrontLeft); + int ridx = GetChannelIdxByName(device->RealOut, FrontRight); + int cidx = GetChannelIdxByName(device->RealOut, FrontCenter); + assert(lidx >= 0 && ridx >= 0 && cidx >= 0); + + ApplyStablizer(device->Stablizer, Buffer, lidx, ridx, cidx, + SamplesToDo, Channels); + } + /* Use NFCtrlData for temp value storage. */ ApplyDistanceComp(Buffer, device->ChannelDelay, device->NFCtrlData, SamplesToDo, Channels); |