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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#include "voice.h" |
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|
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// FIXME: no support for layers (nor crossfades) yet |
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|
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DiskThread* Voice::pDiskThread = NULL; |
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|
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Voice::Voice(DiskThread* pDiskThread) { |
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Active = false; |
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Voice::pDiskThread = pDiskThread; |
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} |
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|
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Voice::~Voice() { |
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} |
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|
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void Voice::Trigger(int MIDIKey, uint8_t Velocity, gig::Instrument* Instrument) { |
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Active = true; |
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this->MIDIKey = MIDIKey; |
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pRegion = Instrument->GetRegion(MIDIKey); |
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PlaybackState = playback_state_ram; // we always start playback from RAM cache and switch then to disk if needed |
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Pos = 0; |
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|
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if (!pRegion) { |
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std::cerr << "Audio Thread: No Region defined for MIDI key " << MIDIKey << std::endl << std::flush; |
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Active = false; |
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return; |
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} |
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|
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//TODO: current MIDI controller values are not taken into account yet |
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gig::DimensionRegion* pDimRgn = NULL; |
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for (int i = pRegion->Dimensions - 1; i >= 0; i--) { // Check if instrument has a velocity split |
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if (pRegion->pDimensionDefinitions[i].dimension == gig::dimension_velocity) { |
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uint DimValues[5] = {0,0,0,0,0}; |
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DimValues[i] = Velocity; |
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pDimRgn = pRegion->GetDimensionRegionByValue(DimValues[4],DimValues[3],DimValues[2],DimValues[1],DimValues[0]); |
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break; |
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} |
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} |
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if (!pDimRgn) { // if there was no velocity split |
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pDimRgn = pRegion->GetDimensionRegionByValue(0,0,0,0,0); |
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} |
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|
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pSample = pDimRgn->pSample; // sample won't change until the voice is finished |
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|
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// Check if the sample needs disk streaming or is too short for that |
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long cachedsamples = pSample->GetCache().Size / pSample->FrameSize; |
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DiskVoice = cachedsamples < pSample->SamplesTotal; |
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|
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if (DiskVoice) { |
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MaxRAMPos = cachedsamples - (OutputBufferSize << MAX_PITCH) / pSample->Channels; |
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pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos); |
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dmsg(5,("Disk voice launched (cached samples: %d, total Samples: %d, MaxRAMPos: %d\n", cachedsamples, pSample->SamplesTotal, MaxRAMPos)); |
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} |
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else { |
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MaxRAMPos = cachedsamples; |
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dmsg(5,("RAM only voice launched\n")); |
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} |
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|
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CurrentPitch = pow(2, (double) (MIDIKey - (int) pSample->MIDIUnityNote) / (double) 12); |
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|
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// ************************************************ |
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// TODO: ARTICULATION DATA HANDLING IS MISSING HERE |
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// ************************************************ |
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} |
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|
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void Voice::RenderAudio() { |
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|
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switch (this->PlaybackState) { |
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|
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case playback_state_ram: { |
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Interpolate((sample_t*) pSample->GetCache().pStart); |
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if (DiskVoice) { |
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// check if we reached the allowed limit of the sample RAM cache |
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if (Pos > MaxRAMPos) { |
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dmsg(5,("Voice: switching to disk playback (Pos=%f)\n", Pos)); |
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this->PlaybackState = playback_state_disk; |
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} |
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} |
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else if (Pos >= pSample->GetCache().Size / pSample->FrameSize) { |
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this->PlaybackState = playback_state_end; |
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} |
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} |
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break; |
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|
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case playback_state_disk: { |
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if (!DiskStreamRef.pStream) { |
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// check if the disk thread created our ordered disk stream in the meantime |
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DiskStreamRef.pStream = pDiskThread->AskForCreatedStream(DiskStreamRef.OrderID); |
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if (!DiskStreamRef.pStream) { |
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std::cout << stderr << "Disk stream not available in time!" << std::endl << std::flush; |
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pDiskThread->OrderDeletionOfStream(&DiskStreamRef); |
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this->Active = false; |
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return; |
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} |
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DiskStreamRef.pStream->IncrementReadPos(pSample->Channels * (double_to_int(Pos) - MaxRAMPos)); |
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Pos -= double_to_int(Pos); |
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} |
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|
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// add silence sample at the end if we reached the end of the stream (for the interpolator) |
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if (DiskStreamRef.State == Stream::state_end && DiskStreamRef.pStream->GetReadSpace() < (OutputBufferSize << MAX_PITCH) / pSample->Channels) { |
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DiskStreamRef.pStream->WriteSilence((OutputBufferSize << MAX_PITCH) / pSample->Channels); |
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this->PlaybackState = playback_state_end; |
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} |
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|
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sample_t* ptr = DiskStreamRef.pStream->GetReadPtr(); // get the current read_ptr within the ringbuffer where we read the samples from |
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Interpolate(ptr); |
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DiskStreamRef.pStream->IncrementReadPos(double_to_int(Pos) * pSample->Channels); |
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Pos -= double_to_int(Pos); |
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} |
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break; |
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|
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case playback_state_end: |
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this->Active = false; // free voice |
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break; |
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} |
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} |
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|
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void Voice::Interpolate(sample_t* pSrc) { |
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float effective_volume = 1; // TODO: use the art. data instead |
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int i = 0; |
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|
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// ************************************************ |
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// TODO: ARTICULATION DATA HANDLING IS MISSING HERE |
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// ************************************************ |
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|
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// FIXME: assuming either mono or stereo |
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if (this->pSample->Channels == 2) { // Stereo Sample |
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while (i < this->OutputBufferSize) { |
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#ifdef USE_LINEAR_INTERPOLATION |
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int pos_int = double_to_int(this->Pos); // integer position |
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float pos_fract = this->Pos - pos_int; // fractional part of position |
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pos_int <<= 1; |
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// left channel |
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this->pOutput[i++] += effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+2] - pSrc[pos_int])); |
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// right channel |
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this->pOutput[i++] += effective_volume * (pSrc[pos_int+1] + pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1])); |
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#else // polynomial interpolation |
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//FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile |
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xm1 = pSrc[pos_int]; |
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x0 = pSrc[pos_int+1]; |
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x1 = pSrc[pos_int+2]; |
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x2 = pSrc[pos_int+3]; |
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a = (3 * (x0-x1) - xm1 + x2) / 2; |
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b = 2 * x1 + xm1 - (5 * x0 + x2) / 2; |
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c = (x1 - xm1) / 2; |
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this->pOutput[u] += effective_volume*((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0); |
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#endif // USE_LINEAR_INTERPOLATION |
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|
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this->Pos += this->CurrentPitch; |
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} |
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} |
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else { // Mono Sample |
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while (i < this->OutputBufferSize) { |
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#ifdef USE_LINEAR_INTERPOLATION |
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int pos_int = double_to_int(this->Pos); // integer position |
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float pos_fract = this->Pos - pos_int; // fractional part of position |
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float sample_point = effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int])); |
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this->pOutput[i] += sample_point; |
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this->pOutput[i+1] += sample_point; |
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i += 2; |
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#else // polynomial interpolation |
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//FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile |
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xm1 = pSrc[pos_int]; |
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x0 = pSrc[pos_int+1]; |
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x1 = pSrc[pos_int+2]; |
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x2 = pSrc[pos_int+3]; |
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a = (3 * (x0-x1) - xm1 + x2) / 2; |
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b = 2 * x1 + xm1 - (5 * x0 + x2) / 2; |
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c = (x1 - xm1) / 2; |
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this->pOutput[u] += effective_volume*((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0); |
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#endif |
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|
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this->Pos += this->CurrentPitch; |
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} |
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} |
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} |
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|
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void Voice::Kill() { |
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if (DiskVoice && DiskStreamRef.State != Stream::state_unused) { |
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pDiskThread->OrderDeletionOfStream(&DiskStreamRef); |
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} |
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Active = false; |
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} |