From e442bb7cd6a085b33a4dd52c0e20a157ada7feb1 Mon Sep 17 00:00:00 2001 From: The Android Open Source Project Date: Tue, 21 Oct 2008 07:00:00 -0700 Subject: Initial Contribution --- arm-wt-22k/lib_src/eas_wtsynth.c | 1257 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 1257 insertions(+) create mode 100644 arm-wt-22k/lib_src/eas_wtsynth.c (limited to 'arm-wt-22k/lib_src/eas_wtsynth.c') diff --git a/arm-wt-22k/lib_src/eas_wtsynth.c b/arm-wt-22k/lib_src/eas_wtsynth.c new file mode 100644 index 0000000..3eadf2d --- /dev/null +++ b/arm-wt-22k/lib_src/eas_wtsynth.c @@ -0,0 +1,1257 @@ +/*---------------------------------------------------------------------------- + * + * File: + * eas_wtsynth.c + * + * Contents and purpose: + * Implements the synthesizer functions. + * + * Copyright Sonic Network Inc. 2004 + + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + *---------------------------------------------------------------------------- + * Revision Control: + * $Revision: 795 $ + * $Date: 2007-08-01 00:14:45 -0700 (Wed, 01 Aug 2007) $ + *---------------------------------------------------------------------------- +*/ + +// includes +#include "eas_data.h" +#include "eas_report.h" +#include "eas_host.h" +#include "eas_math.h" +#include "eas_synth_protos.h" +#include "eas_wtsynth.h" +#include "eas_pan.h" + +#ifdef DLS_SYNTHESIZER +#include "eas_dlssynth.h" +#endif + +#ifdef _METRICS_ENABLED +#include "eas_perf.h" +#endif + +/* local prototypes */ +static EAS_RESULT WT_Initialize(S_VOICE_MGR *pVoiceMgr); +static void WT_ReleaseVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum); +static void WT_MuteVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum); +static void WT_SustainPedal (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, S_SYNTH_CHANNEL *pChannel, EAS_I32 voiceNum); +static EAS_RESULT WT_StartVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum, EAS_U16 regionIndex); +static EAS_BOOL WT_UpdateVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum, EAS_I32 *pMixBuffer, EAS_I32 numSamples); +static void WT_UpdateChannel (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, EAS_U8 channel); +static EAS_I32 WT_UpdatePhaseInc (S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 pitchCents); +static EAS_I32 WT_UpdateGain (S_SYNTH_VOICE *pVoice, S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 gain); +static void WT_UpdateEG1 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv); +static void WT_UpdateEG2 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv); + +#ifdef EAS_SPLIT_WT_SYNTH +extern EAS_BOOL WTE_StartFrame (EAS_FRAME_BUFFER_HANDLE pFrameBuffer); +extern EAS_BOOL WTE_EndFrame (EAS_FRAME_BUFFER_HANDLE pFrameBuffer, EAS_I32 *pMixBuffer, EAS_I16 masterGain); +#endif + +#ifdef _FILTER_ENABLED +static void WT_UpdateFilter (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pIntFrame, const S_ARTICULATION *pArt); +#endif + +#ifdef _STATS +extern double statsPhaseIncrement; +extern double statsMaxPhaseIncrement; +extern long statsPhaseSampleCount; +extern double statsSampleSize; +extern long statsSampleCount; +#endif + +/*---------------------------------------------------------------------------- + * Synthesizer interface + *---------------------------------------------------------------------------- +*/ + +const S_SYNTH_INTERFACE wtSynth = +{ + WT_Initialize, + WT_StartVoice, + WT_UpdateVoice, + WT_ReleaseVoice, + WT_MuteVoice, + WT_SustainPedal, + WT_UpdateChannel +}; + +#ifdef EAS_SPLIT_WT_SYNTH +const S_FRAME_INTERFACE wtFrameInterface = +{ + WTE_StartFrame, + WTE_EndFrame +}; +#endif + +/*---------------------------------------------------------------------------- + * WT_Initialize() + *---------------------------------------------------------------------------- + * Purpose: + * + * Inputs: + * pVoice - pointer to voice to initialize + * + * Outputs: + * + *---------------------------------------------------------------------------- +*/ +static EAS_RESULT WT_Initialize (S_VOICE_MGR *pVoiceMgr) +{ + EAS_INT i; + + for (i = 0; i < NUM_WT_VOICES; i++) + { + + pVoiceMgr->wtVoices[i].artIndex = DEFAULT_ARTICULATION_INDEX; + + pVoiceMgr->wtVoices[i].eg1State = DEFAULT_EG1_STATE; + pVoiceMgr->wtVoices[i].eg1Value = DEFAULT_EG1_VALUE; + pVoiceMgr->wtVoices[i].eg1Increment = DEFAULT_EG1_INCREMENT; + + pVoiceMgr->wtVoices[i].eg2State = DEFAULT_EG2_STATE; + pVoiceMgr->wtVoices[i].eg2Value = DEFAULT_EG2_VALUE; + pVoiceMgr->wtVoices[i].eg2Increment = DEFAULT_EG2_INCREMENT; + + /* left and right gain values are needed only if stereo output */ +#if (NUM_OUTPUT_CHANNELS == 2) + pVoiceMgr->wtVoices[i].gainLeft = DEFAULT_VOICE_GAIN; + pVoiceMgr->wtVoices[i].gainRight = DEFAULT_VOICE_GAIN; +#endif + + pVoiceMgr->wtVoices[i].phaseFrac = DEFAULT_PHASE_FRAC; + pVoiceMgr->wtVoices[i].phaseAccum = DEFAULT_PHASE_INT; + +#ifdef _FILTER_ENABLED + pVoiceMgr->wtVoices[i].filter.z1 = DEFAULT_FILTER_ZERO; + pVoiceMgr->wtVoices[i].filter.z2 = DEFAULT_FILTER_ZERO; +#endif + } + + return EAS_TRUE; +} + +/*---------------------------------------------------------------------------- + * WT_ReleaseVoice() + *---------------------------------------------------------------------------- + * Purpose: + * The selected voice is being released. + * + * Inputs: + * pEASData - pointer to S_EAS_DATA + * pVoice - pointer to voice to release + * + * Outputs: + * None + *---------------------------------------------------------------------------- +*/ +/*lint -esym(715, pVoice) used in some implementations */ +static void WT_ReleaseVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum) +{ + S_WT_VOICE *pWTVoice; + const S_ARTICULATION *pArticulation; + +#ifdef DLS_SYNTHESIZER + if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) + { + DLS_ReleaseVoice(pVoiceMgr, pSynth, pVoice, voiceNum); + return; + } +#endif + + pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; + pArticulation = &pSynth->pEAS->pArticulations[pWTVoice->artIndex]; + + /* release EG1 */ + pWTVoice->eg1State = eEnvelopeStateRelease; + pWTVoice->eg1Increment = pArticulation->eg1.releaseTime; + + /* + The spec says we should release EG2, but doing so with the current + voicing is causing clicks. This fix will need to be coordinated with + a new sound library release + */ + + /* release EG2 */ + pWTVoice->eg2State = eEnvelopeStateRelease; + pWTVoice->eg2Increment = pArticulation->eg2.releaseTime; +} + +/*---------------------------------------------------------------------------- + * WT_MuteVoice() + *---------------------------------------------------------------------------- + * Purpose: + * The selected voice is being muted. + * + * Inputs: + * pVoice - pointer to voice to release + * + * Outputs: + * None + *---------------------------------------------------------------------------- +*/ +/*lint -esym(715, pSynth) used in some implementations */ +static void WT_MuteVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum) +{ + +#ifdef DLS_SYNTHESIZER + if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) + { + DLS_MuteVoice(pVoiceMgr, pSynth, pVoice, voiceNum); + return; + } +#endif + + /* clear deferred action flags */ + pVoice->voiceFlags &= + ~(VOICE_FLAG_DEFER_MIDI_NOTE_OFF | + VOICE_FLAG_SUSTAIN_PEDAL_DEFER_NOTE_OFF | + VOICE_FLAG_DEFER_MUTE); + + /* set the envelope state */ + pVoiceMgr->wtVoices[voiceNum].eg1State = eEnvelopeStateMuted; + pVoiceMgr->wtVoices[voiceNum].eg2State = eEnvelopeStateMuted; +} + +/*---------------------------------------------------------------------------- + * WT_SustainPedal() + *---------------------------------------------------------------------------- + * Purpose: + * The selected voice is held due to sustain pedal + * + * Inputs: + * pVoice - pointer to voice to sustain + * + * Outputs: + * None + *---------------------------------------------------------------------------- +*/ +/*lint -esym(715, pChannel) used in some implementations */ +static void WT_SustainPedal (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, S_SYNTH_CHANNEL *pChannel, EAS_I32 voiceNum) +{ + S_WT_VOICE *pWTVoice; + +#ifdef DLS_SYNTHESIZER + if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) + { + DLS_SustainPedal(pVoiceMgr, pSynth, pVoice, pChannel, voiceNum); + return; + } +#endif + + /* don't catch the voice if below the sustain level */ + pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; + if (pWTVoice->eg1Value < pSynth->pEAS->pArticulations[pWTVoice->artIndex].eg1.sustainLevel) + return; + + /* sustain flag is set, damper pedal is on */ + /* defer releasing this note until the damper pedal is off */ + pWTVoice->eg1State = eEnvelopeStateDecay; + pVoice->voiceState = eVoiceStatePlay; + + /* + because sustain pedal is on, this voice + should defer releasing its note + */ + pVoice->voiceFlags |= VOICE_FLAG_SUSTAIN_PEDAL_DEFER_NOTE_OFF; + +#ifdef _DEBUG_SYNTH + { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_SustainPedal: defer note off because sustain pedal is on\n"); */ } +#endif +} + +/*---------------------------------------------------------------------------- + * WT_StartVoice() + *---------------------------------------------------------------------------- + * Purpose: + * Assign the region for the given instrument using the midi key number + * and the RPN2 (coarse tuning) value. By using RPN2 as part of the + * region selection process, we reduce the amount a given sample has + * to be transposed by selecting the closest recorded root instead. + * + * This routine is the second half of SynthAssignRegion(). + * If the region was successfully found by SynthFindRegionIndex(), + * then assign the region's parameters to the voice. + * + * Setup and initialize the following voice parameters: + * m_nRegionIndex + * + * Inputs: + * pVoice - ptr to the voice we have assigned for this channel + * nRegionIndex - index of the region + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * success - could find and assign the region for this voice's note otherwise + * failure - could not find nor assign the region for this voice's note + * + * Side Effects: + * psSynthObject->m_sVoice[].m_nRegionIndex is assigned + * psSynthObject->m_sVoice[] parameters are assigned + *---------------------------------------------------------------------------- +*/ +static EAS_RESULT WT_StartVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum, EAS_U16 regionIndex) +{ + S_WT_VOICE *pWTVoice; + const S_WT_REGION *pRegion; + const S_ARTICULATION *pArt; + S_SYNTH_CHANNEL *pChannel; + +#if (NUM_OUTPUT_CHANNELS == 2) + EAS_INT pan; +#endif + +#ifdef EAS_SPLIT_WT_SYNTH + S_WT_CONFIG wtConfig; +#endif + + /* no samples have been synthesized for this note yet */ + pVoice->regionIndex = regionIndex; + pVoice->voiceFlags = VOICE_FLAG_NO_SAMPLES_SYNTHESIZED_YET; + + /* get the articulation index for this region */ + pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; + pChannel = &pSynth->channels[pVoice->channel & 15]; + + /* update static channel parameters */ + if (pChannel->channelFlags & CHANNEL_FLAG_UPDATE_CHANNEL_PARAMETERS) + WT_UpdateChannel(pVoiceMgr, pSynth, pVoice->channel & 15); + +#ifdef DLS_SYNTHESIZER + if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) + return DLS_StartVoice(pVoiceMgr, pSynth, pVoice, voiceNum, regionIndex); +#endif + + pRegion = &(pSynth->pEAS->pWTRegions[regionIndex]); + pWTVoice->artIndex = pRegion->artIndex; + +#ifdef _DEBUG_SYNTH + { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_StartVoice: Voice %ld; Region %d\n", (EAS_I32) (pVoice - pVoiceMgr->voices), regionIndex); */ } +#endif + + pArt = &pSynth->pEAS->pArticulations[pWTVoice->artIndex]; + + /* MIDI note on puts this voice into attack state */ + pWTVoice->eg1State = eEnvelopeStateAttack; + pWTVoice->eg1Value = 0; + pWTVoice->eg1Increment = pArt->eg1.attackTime; + pWTVoice->eg2State = eEnvelopeStateAttack; + pWTVoice->eg2Value = 0; + pWTVoice->eg2Increment = pArt->eg2.attackTime; + + /* init the LFO */ + pWTVoice->modLFO.lfoValue = 0; + pWTVoice->modLFO.lfoPhase = -pArt->lfoDelay; + + pVoice->gain = 0; + +#if (NUM_OUTPUT_CHANNELS == 2) + /* + Get the Midi CC10 pan value for this voice's channel + convert the pan value to an "angle" representation suitable for + our sin, cos calculator. This representation is NOT necessarily the same + as the transform in the GM manuals because of our sin, cos calculator. + "angle" = (CC10 - 64)/128 + */ + pan = (EAS_INT) pSynth->channels[pVoice->channel & 15].pan - 64; + pan += pArt->pan; + EAS_CalcPanControl(pan, &pWTVoice->gainLeft, &pWTVoice->gainRight); +#endif + +#ifdef _FILTER_ENABLED + /* clear out the filter states */ + pWTVoice->filter.z1 = 0; + pWTVoice->filter.z2 = 0; +#endif + + /* if this wave is to be generated using noise generator */ + if (pRegion->region.keyGroupAndFlags & REGION_FLAG_USE_WAVE_GENERATOR) + { + pWTVoice->phaseAccum = 4574296; + pWTVoice->loopStart = WT_NOISE_GENERATOR; + pWTVoice->loopEnd = 4574295; + } + + /* normal sample */ + else + { + +#ifdef EAS_SPLIT_WT_SYNTH + if (voiceNum < NUM_PRIMARY_VOICES) + pWTVoice->phaseAccum = (EAS_U32) pSynth->pEAS->pSamples + pSynth->pEAS->pSampleOffsets[pRegion->waveIndex]; + else + pWTVoice->phaseAccum = pSynth->pEAS->pSampleOffsets[pRegion->waveIndex]; +#else + pWTVoice->phaseAccum = (EAS_U32) pSynth->pEAS->pSamples + pSynth->pEAS->pSampleOffsets[pRegion->waveIndex]; +#endif + + if (pRegion->region.keyGroupAndFlags & REGION_FLAG_IS_LOOPED) + { + pWTVoice->loopStart = pWTVoice->phaseAccum + pRegion->loopStart; + pWTVoice->loopEnd = pWTVoice->phaseAccum + pRegion->loopEnd - 1; + } + else + pWTVoice->loopStart = pWTVoice->loopEnd = pWTVoice->phaseAccum + pSynth->pEAS->pSampleLen[pRegion->waveIndex] - 1; + } + +#ifdef EAS_SPLIT_WT_SYNTH + /* configure off-chip voices */ + if (voiceNum >= NUM_PRIMARY_VOICES) + { + wtConfig.phaseAccum = pWTVoice->phaseAccum; + wtConfig.loopStart = pWTVoice->loopStart; + wtConfig.loopEnd = pWTVoice->loopEnd; + wtConfig.gain = pVoice->gain; + +#if (NUM_OUTPUT_CHANNELS == 2) + wtConfig.gainLeft = pWTVoice->gainLeft; + wtConfig.gainRight = pWTVoice->gainRight; +#endif + + WTE_ConfigVoice(voiceNum - NUM_PRIMARY_VOICES, &wtConfig, pVoiceMgr->pFrameBuffer); + } +#endif + + return EAS_SUCCESS; +} + +/*---------------------------------------------------------------------------- + * WT_CheckSampleEnd + *---------------------------------------------------------------------------- + * Purpose: + * Check for end of sample and calculate number of samples to synthesize + * + * Inputs: + * + * Outputs: + * + * Notes: + * + *---------------------------------------------------------------------------- +*/ +EAS_BOOL WT_CheckSampleEnd (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pWTIntFrame, EAS_BOOL update) +{ + EAS_U32 endPhaseAccum; + EAS_U32 endPhaseFrac; + EAS_I32 numSamples; + EAS_BOOL done = EAS_FALSE; + + /* check to see if we hit the end of the waveform this time */ + /*lint -e{703} use shift for performance */ + endPhaseFrac = pWTVoice->phaseFrac + (pWTIntFrame->frame.phaseIncrement << SYNTH_UPDATE_PERIOD_IN_BITS); + endPhaseAccum = pWTVoice->phaseAccum + GET_PHASE_INT_PART(endPhaseFrac); + if (endPhaseAccum >= pWTVoice->loopEnd) + { + /* calculate how far current ptr is from end */ + numSamples = (EAS_I32) (pWTVoice->loopEnd - pWTVoice->phaseAccum); + + /* now account for the fractional portion */ + /*lint -e{703} use shift for performance */ + numSamples = (EAS_I32) ((numSamples << NUM_PHASE_FRAC_BITS) - pWTVoice->phaseFrac); + if (pWTIntFrame->frame.phaseIncrement) { + pWTIntFrame->numSamples = 1 + (numSamples / pWTIntFrame->frame.phaseIncrement); + } else { + pWTIntFrame->numSamples = numSamples; + } + + /* sound will be done this frame */ + done = EAS_TRUE; + } + + /* update data for off-chip synth */ + if (update) + { + pWTVoice->phaseFrac = endPhaseFrac; + pWTVoice->phaseAccum = endPhaseAccum; + } + + return done; +} + +/*---------------------------------------------------------------------------- + * WT_UpdateVoice() + *---------------------------------------------------------------------------- + * Purpose: + * Synthesize a block of samples for the given voice. + * Use linear interpolation. + * + * Inputs: + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * number of samples actually written to buffer + * + * Side Effects: + * - samples are added to the presently free buffer + * + *---------------------------------------------------------------------------- +*/ +static EAS_BOOL WT_UpdateVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum, EAS_I32 *pMixBuffer, EAS_I32 numSamples) +{ + S_WT_VOICE *pWTVoice; + S_WT_INT_FRAME intFrame; + S_SYNTH_CHANNEL *pChannel; + const S_WT_REGION *pWTRegion; + const S_ARTICULATION *pArt; + EAS_I32 temp; + EAS_BOOL done; + +#ifdef DLS_SYNTHESIZER + if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) + return DLS_UpdateVoice(pVoiceMgr, pSynth, pVoice, voiceNum, pMixBuffer, numSamples); +#endif + + /* establish pointers to critical data */ + pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; + pWTRegion = &pSynth->pEAS->pWTRegions[pVoice->regionIndex & REGION_INDEX_MASK]; + pArt = &pSynth->pEAS->pArticulations[pWTVoice->artIndex]; + pChannel = &pSynth->channels[pVoice->channel & 15]; + intFrame.prevGain = pVoice->gain; + + /* update the envelopes */ + WT_UpdateEG1(pWTVoice, &pArt->eg1); + WT_UpdateEG2(pWTVoice, &pArt->eg2); + + /* update the LFO */ + WT_UpdateLFO(&pWTVoice->modLFO, pArt->lfoFreq); + +#ifdef _FILTER_ENABLED + /* calculate filter if library uses filter */ + if (pSynth->pEAS->libAttr & LIB_FORMAT_FILTER_ENABLED) + WT_UpdateFilter(pWTVoice, &intFrame, pArt); + else + intFrame.frame.k = 0; +#endif + + /* update the gain */ + intFrame.frame.gainTarget = WT_UpdateGain(pVoice, pWTVoice, pArt, pChannel, pWTRegion->gain); + + /* calculate base pitch*/ + temp = pChannel->staticPitch + pWTRegion->tuning; + + /* include global transpose */ + if (pChannel->channelFlags & CHANNEL_FLAG_RHYTHM_CHANNEL) + temp += pVoice->note * 100; + else + temp += (pVoice->note + pSynth->globalTranspose) * 100; + intFrame.frame.phaseIncrement = WT_UpdatePhaseInc(pWTVoice, pArt, pChannel, temp); + + /* call into engine to generate samples */ + intFrame.pAudioBuffer = pVoiceMgr->voiceBuffer; + intFrame.pMixBuffer = pMixBuffer; + intFrame.numSamples = numSamples; + + /* check for end of sample */ + if ((pWTVoice->loopStart != WT_NOISE_GENERATOR) && (pWTVoice->loopStart == pWTVoice->loopEnd)) + done = WT_CheckSampleEnd(pWTVoice, &intFrame, (EAS_BOOL) (voiceNum >= NUM_PRIMARY_VOICES)); + else + done = EAS_FALSE; + + if (intFrame.numSamples < 0) intFrame.numSamples = 0; + +#ifdef EAS_SPLIT_WT_SYNTH + if (voiceNum < NUM_PRIMARY_VOICES) + { +#ifndef _SPLIT_WT_TEST_HARNESS + WT_ProcessVoice(pWTVoice, &intFrame); +#endif + } + else + WTE_ProcessVoice(voiceNum - NUM_PRIMARY_VOICES, &intFrame.frame, pVoiceMgr->pFrameBuffer); +#else + WT_ProcessVoice(pWTVoice, &intFrame); +#endif + + /* clear flag */ + pVoice->voiceFlags &= ~VOICE_FLAG_NO_SAMPLES_SYNTHESIZED_YET; + + /* if voice has finished, set flag for voice manager */ + if ((pVoice->voiceState != eVoiceStateStolen) && (pWTVoice->eg1State == eEnvelopeStateMuted)) + done = EAS_TRUE; + + /* if the update interval has elapsed, then force the current gain to the next + * gain since we never actually reach the next gain when ramping -- we just get + * very close to the target gain. + */ + pVoice->gain = (EAS_I16) intFrame.frame.gainTarget; + + return done; +} + +/*---------------------------------------------------------------------------- + * WT_UpdatePhaseInc() + *---------------------------------------------------------------------------- + * Purpose: + * Calculate the phase increment + * + * Inputs: + * pVoice - pointer to the voice being updated + * psRegion - pointer to the region + * psArticulation - pointer to the articulation + * nChannelPitchForThisVoice - the portion of the pitch that is fixed for this + * voice during the duration of this synthesis + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * + * Side Effects: + * set the phase increment for this voice + *---------------------------------------------------------------------------- +*/ +static EAS_I32 WT_UpdatePhaseInc (S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 pitchCents) +{ + EAS_I32 temp; + + /*pitchCents due to CC1 = LFO * (CC1 / 128) * DEFAULT_LFO_MOD_WHEEL_TO_PITCH_CENTS */ + temp = MULT_EG1_EG1(DEFAULT_LFO_MOD_WHEEL_TO_PITCH_CENTS, + ((pChannel->modWheel) << (NUM_EG1_FRAC_BITS -7))); + + /* pitchCents due to channel pressure = LFO * (channel pressure / 128) * DEFAULT_LFO_CHANNEL_PRESSURE_TO_PITCH_CENTS */ + temp += MULT_EG1_EG1(DEFAULT_LFO_CHANNEL_PRESSURE_TO_PITCH_CENTS, + ((pChannel->channelPressure) << (NUM_EG1_FRAC_BITS -7))); + + /* now multiply the (channel pressure + CC1) pitch values by the LFO value */ + temp = MULT_EG1_EG1(pWTVoice->modLFO.lfoValue, temp); + + /* + add in the LFO pitch due to + channel pressure and CC1 along with + the LFO pitch, the EG2 pitch, and the + "static" pitch for this voice on this channel + */ + temp += pitchCents + + (MULT_EG1_EG1(pWTVoice->eg2Value, pArt->eg2ToPitch)) + + (MULT_EG1_EG1(pWTVoice->modLFO.lfoValue, pArt->lfoToPitch)); + + /* convert from cents to linear phase increment */ + return EAS_Calculate2toX(temp); +} + +/*---------------------------------------------------------------------------- + * WT_UpdateChannel() + *---------------------------------------------------------------------------- + * Purpose: + * Calculate and assign static channel parameters + * These values only need to be updated if one of the controller values + * for this channel changes + * + * Inputs: + * nChannel - channel to update + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * + * Side Effects: + * - the given channel's static gain and static pitch are updated + *---------------------------------------------------------------------------- +*/ +/*lint -esym(715, pVoiceMgr) reserved for future use */ +static void WT_UpdateChannel (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, EAS_U8 channel) +{ + EAS_I32 staticGain; + EAS_I32 pitchBend; + S_SYNTH_CHANNEL *pChannel; + + pChannel = &pSynth->channels[channel]; + + /* + nChannelGain = (CC7 * CC11)^2 * master volume + where CC7 == 100 by default, CC11 == 127, master volume == 32767 + */ + staticGain = MULT_EG1_EG1((pChannel->volume) << (NUM_EG1_FRAC_BITS - 7), + (pChannel->expression) << (NUM_EG1_FRAC_BITS - 7)); + + /* staticGain has to be squared */ + staticGain = MULT_EG1_EG1(staticGain, staticGain); + + pChannel->staticGain = (EAS_I16) MULT_EG1_EG1(staticGain, pSynth->masterVolume); + + /* + calculate pitch bend: RPN0 * ((2*pitch wheel)/16384 -1) + However, if we use the EG1 macros, remember that EG1 has a full + scale value of 32768 (instead of 16384). So instead of multiplying + by 2, multiply by 4 (left shift by 2), and subtract by 32768 instead + of 16384. This utilizes the fact that the EG1 macro places a binary + point 15 places to the left instead of 14 places. + */ + /*lint -e{703} */ + pitchBend = + (((EAS_I32)(pChannel->pitchBend) << 2) + - 32768); + + pChannel->staticPitch = + MULT_EG1_EG1(pitchBend, pChannel->pitchBendSensitivity); + + /* if this is not a drum channel, then add in the per-channel tuning */ + if (!(pChannel->channelFlags & CHANNEL_FLAG_RHYTHM_CHANNEL)) + pChannel->staticPitch += pChannel->finePitch + (pChannel->coarsePitch * 100); + + /* clear update flag */ + pChannel->channelFlags &= ~CHANNEL_FLAG_UPDATE_CHANNEL_PARAMETERS; + return; +} + +/*---------------------------------------------------------------------------- + * WT_UpdateGain() + *---------------------------------------------------------------------------- + * Purpose: + * Calculate and assign static voice parameters as part of WT_UpdateVoice() + * + * Inputs: + * pVoice - ptr to the synth voice that we want to synthesize + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * + * Side Effects: + * - various voice parameters are calculated and assigned + * + *---------------------------------------------------------------------------- +*/ +static EAS_I32 WT_UpdateGain (S_SYNTH_VOICE *pVoice, S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 gain) +{ + EAS_I32 lfoGain; + EAS_I32 temp; + + /* + If this voice was stolen, then the velocity is actually + for the new note, not the note that we are currently ramping down. + So we really shouldn't use this velocity. However, that would require + more memory to store the velocity value, and the improvement may + not be sufficient to warrant the added memory. + */ + /* velocity is fixed at note start for a given voice and must be squared */ + temp = (pVoice->velocity) << (NUM_EG1_FRAC_BITS - 7); + temp = MULT_EG1_EG1(temp, temp); + + /* region gain is fixed as part of the articulation */ + temp = MULT_EG1_EG1(temp, gain); + + /* include the channel gain */ + temp = MULT_EG1_EG1(temp, pChannel->staticGain); + + /* calculate LFO gain using an approximation for 10^x */ + lfoGain = MULT_EG1_EG1(pWTVoice->modLFO.lfoValue, pArt->lfoToGain); + lfoGain = MULT_EG1_EG1(lfoGain, LFO_GAIN_TO_CENTS); + + /* convert from a dB-like value to linear gain */ + lfoGain = EAS_Calculate2toX(lfoGain); + temp = MULT_EG1_EG1(temp, lfoGain); + + /* calculate the voice's gain */ + temp = (EAS_I16)MULT_EG1_EG1(temp, pWTVoice->eg1Value); + + return temp; +} + +/*---------------------------------------------------------------------------- + * WT_UpdateEG1() + *---------------------------------------------------------------------------- + * Purpose: + * Calculate the EG1 envelope for the given voice (but do not update any + * state) + * + * Inputs: + * pVoice - ptr to the voice whose envelope we want to update + * nVoice - this voice's number - used only for debug + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * nValue - the envelope value + * + * Side Effects: + * - updates EG1 state value for the given voice + *---------------------------------------------------------------------------- +*/ +static void WT_UpdateEG1 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv) +{ + EAS_I32 temp; + + switch (pWTVoice->eg1State) + { + case eEnvelopeStateAttack: + temp = pWTVoice->eg1Value + pWTVoice->eg1Increment; + + /* check if we have reached peak amplitude */ + if (temp >= SYNTH_FULL_SCALE_EG1_GAIN) + { + /* limit the volume */ + temp = SYNTH_FULL_SCALE_EG1_GAIN; + + /* prepare to move to decay state */ + pWTVoice->eg1State = eEnvelopeStateDecay; + pWTVoice->eg1Increment = pEnv->decayTime; + } + + break; + + /* exponential decay */ + case eEnvelopeStateDecay: + temp = MULT_EG1_EG1(pWTVoice->eg1Value, pWTVoice->eg1Increment); + + /* check if we have reached sustain level */ + if (temp <= pEnv->sustainLevel) + { + /* enforce the sustain level */ + temp = pEnv->sustainLevel; + + /* if sustain level is zero, skip sustain & release the voice */ + if (temp > 0) + pWTVoice->eg1State = eEnvelopeStateSustain; + + /* move to sustain state */ + else + pWTVoice->eg1State = eEnvelopeStateMuted; + } + + break; + + case eEnvelopeStateSustain: + return; + + case eEnvelopeStateRelease: + temp = MULT_EG1_EG1(pWTVoice->eg1Value, pWTVoice->eg1Increment); + + /* if we hit zero, this voice isn't contributing any audio */ + if (temp <= 0) + { + temp = 0; + pWTVoice->eg1State = eEnvelopeStateMuted; + } + break; + + /* voice is muted, set target to zero */ + case eEnvelopeStateMuted: + temp = 0; + break; + + case eEnvelopeStateInvalid: + default: + temp = 0; +#ifdef _DEBUG_SYNTH + { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_UpdateEG1: error, %d is an unrecognized state\n", + pWTVoice->eg1State); */ } +#endif + break; + + } + + pWTVoice->eg1Value = (EAS_I16) temp; +} + +/*---------------------------------------------------------------------------- + * WT_UpdateEG2() + *---------------------------------------------------------------------------- + * Purpose: + * Update the EG2 envelope for the given voice + * + * Inputs: + * pVoice - ptr to the voice whose envelope we want to update + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * + * Side Effects: + * - updates EG2 values for the given voice + *---------------------------------------------------------------------------- +*/ + +static void WT_UpdateEG2 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv) +{ + EAS_I32 temp; + + switch (pWTVoice->eg2State) + { + case eEnvelopeStateAttack: + temp = pWTVoice->eg2Value + pWTVoice->eg2Increment; + + /* check if we have reached peak amplitude */ + if (temp >= SYNTH_FULL_SCALE_EG1_GAIN) + { + /* limit the volume */ + temp = SYNTH_FULL_SCALE_EG1_GAIN; + + /* prepare to move to decay state */ + pWTVoice->eg2State = eEnvelopeStateDecay; + + pWTVoice->eg2Increment = pEnv->decayTime; + } + + break; + + /* implement linear pitch decay in cents */ + case eEnvelopeStateDecay: + temp = pWTVoice->eg2Value -pWTVoice->eg2Increment; + + /* check if we have reached sustain level */ + if (temp <= pEnv->sustainLevel) + { + /* enforce the sustain level */ + temp = pEnv->sustainLevel; + + /* prepare to move to sustain state */ + pWTVoice->eg2State = eEnvelopeStateSustain; + } + break; + + case eEnvelopeStateSustain: + return; + + case eEnvelopeStateRelease: + temp = pWTVoice->eg2Value - pWTVoice->eg2Increment; + + if (temp <= 0) + { + temp = 0; + pWTVoice->eg2State = eEnvelopeStateMuted; + } + + break; + + /* voice is muted, set target to zero */ + case eEnvelopeStateMuted: + temp = 0; + break; + + case eEnvelopeStateInvalid: + default: + temp = 0; +#ifdef _DEBUG_SYNTH + { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_UpdateEG2: error, %d is an unrecognized state\n", + pWTVoice->eg2State); */ } +#endif + break; + } + + pWTVoice->eg2Value = (EAS_I16) temp; +} + +/*---------------------------------------------------------------------------- + * WT_UpdateLFO () + *---------------------------------------------------------------------------- + * Purpose: + * Calculate the LFO for the given voice + * + * Inputs: + * pLFO - ptr to the LFO data + * phaseInc - phase increment + * + * Outputs: + * + * Side Effects: + * - updates LFO values for the given voice + *---------------------------------------------------------------------------- +*/ +void WT_UpdateLFO (S_LFO_CONTROL *pLFO, EAS_I16 phaseInc) +{ + + /* To save memory, if m_nPhaseValue is negative, we are in the + * delay phase, and m_nPhaseValue represents the time left + * in the delay. + */ + if (pLFO->lfoPhase < 0) + { + pLFO->lfoPhase++; + return; + } + + /* calculate LFO output from phase value */ + /*lint -e{701} Use shift for performance */ + pLFO->lfoValue = (EAS_I16) (pLFO->lfoPhase << 2); + /*lint -e{502} */ + if ((pLFO->lfoPhase > 0x1fff) && (pLFO->lfoPhase < 0x6000)) + pLFO->lfoValue = ~pLFO->lfoValue; + + /* update LFO phase */ + pLFO->lfoPhase = (pLFO->lfoPhase + phaseInc) & 0x7fff; +} + +#ifdef _FILTER_ENABLED +/*---------------------------------------------------------------------------- + * WT_UpdateFilter() + *---------------------------------------------------------------------------- + * Purpose: + * Update the Filter parameters + * + * Inputs: + * pVoice - ptr to the voice whose filter we want to update + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * + * Side Effects: + * - updates Filter values for the given voice + *---------------------------------------------------------------------------- +*/ +static void WT_UpdateFilter (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pIntFrame, const S_ARTICULATION *pArt) +{ + EAS_I32 cutoff; + + /* no need to calculate filter coefficients if it is bypassed */ + if (pArt->filterCutoff == DEFAULT_EAS_FILTER_CUTOFF_FREQUENCY) + { + pIntFrame->frame.k = 0; + return; + } + + /* determine the dynamic cutoff frequency */ + cutoff = MULT_EG1_EG1(pWTVoice->eg2Value, pArt->eg2ToFc); + cutoff += pArt->filterCutoff; + + /* subtract the A5 offset and the sampling frequency */ + cutoff -= FILTER_CUTOFF_FREQ_ADJUST + A5_PITCH_OFFSET_IN_CENTS; + + /* limit the cutoff frequency */ + if (cutoff > FILTER_CUTOFF_MAX_PITCH_CENTS) + cutoff = FILTER_CUTOFF_MAX_PITCH_CENTS; + else if (cutoff < FILTER_CUTOFF_MIN_PITCH_CENTS) + cutoff = FILTER_CUTOFF_MIN_PITCH_CENTS; + + WT_SetFilterCoeffs(pIntFrame, cutoff, pArt->filterQ); +} +#endif + +#if defined(_FILTER_ENABLED) || defined(DLS_SYNTHESIZER) +/*---------------------------------------------------------------------------- + * coef + *---------------------------------------------------------------------------- + * Table of filter coefficients for low-pass filter + *---------------------------------------------------------------------------- + * + * polynomial coefficients are based on 8kHz sampling frequency + * filter coef b2 = k2 = k2g0*k^0 + k2g1*k^1*(2^x) + k2g2*k^2*(2^x) + * + *where k2g0, k2g1, k2g2 are from the truncated power series expansion on theta + *(k*2^x = theta, but we incorporate the k along with the k2g0, k2g1, k2g2) + *note: this is a power series in 2^x, not k*2^x + *where k = (2*pi*440)/8kHz == convert octaves to radians + * + * so actually, the following coefs listed as k2g0, k2g1, k2g2 are really + * k2g0*k^0 = k2g0 + * k2g1*k^1 + * k2g2*k^2 + * + * + * filter coef n1 = numerator = n1g0*k^0 + n1g1*k^1*(2^x) + n1g2*k^2*(2^x) + n1g3*k^3*(2^x) + * + *where n1g0, n1g1, n1g2, n1g3 are from the truncated power series expansion on theta + *(k*2^x = theta, but we incorporate the k along with the n1g0, n1g1, n1g2, n2g3) + *note: this is a power series in 2^x, not k*2^x + *where k = (2*pi*440)/8kHz == convert octaves to radians + *we also include the optimization factor of 0.81 + * + * so actually, the following coefs listed as n1g0, n1g1, n1g2, n2g3 are really + * n1g0*k^0 = n1g0 + * n1g1*k^1 + * n1g2*k^2 + * n1g3*k^3 + * + * NOTE that n1g0 == n1g1 == 0, always, so we only need to store n1g2 and n1g3 + *---------------------------------------------------------------------------- +*/ + +static const EAS_I16 nk1g0 = -32768; +static const EAS_I16 nk1g2 = 1580; +static const EAS_I16 k2g0 = 32767; + +static const EAS_I16 k2g1[] = +{ + -11324, /* k2g1[0] = -0.3455751918948761 */ + -10387, /* k2g1[1] = -0.3169878073928751 */ + -9528, /* k2g1[2] = -0.29076528753345476 */ + -8740, /* k2g1[3] = -0.2667120011011279 */ + -8017, /* k2g1[4] = -0.24464850028971705 */ + -7353, /* k2g1[5] = -0.22441018194495696 */ + -6745, /* k2g1[6] = -0.20584605955455101 */ + -6187, /* k2g1[7] = -0.18881763682420102 */ + -5675, /* k2g1[8] = -0.1731978744360067 */ + -5206, /* k2g1[9] = -0.15887024228080968 */ + -4775, /* k2g1[10] = -0.14572785009373057 */ + -4380, /* k2g1[11] = -0.13367265000706827 */ + -4018, /* k2g1[12] = -0.1226147050712642 */ + -3685, /* k2g1[13] = -0.11247151828678581 */ + -3381, /* k2g1[14] = -0.10316741714122014 */ + -3101, /* k2g1[15] = -0.0946329890599603 */ + -2844, /* k2g1[16] = -0.08680456355870586 */ + -2609, /* k2g1[17] = -0.07962373723441349 */ + -2393, /* k2g1[18] = -0.07303693805092666 */ + -2195, /* k2g1[19] = -0.06699502566866912 */ + -2014, /* k2g1[20] = -0.06145292483669077 */ + -1847, /* k2g1[21] = -0.056369289112013346 */ + -1694, /* k2g1[22] = -0.05170619239747895 */ + -1554, /* k2g1[23] = -0.04742884599684141 */ + -1426, /* k2g1[24] = -0.043505339076210514 */ + -1308, /* k2g1[25] = -0.03990640059558053 */ + -1199, /* k2g1[26] = -0.03660518093435039 */ + -1100, /* k2g1[27] = -0.03357705158166837 */ + -1009, /* k2g1[28] = -0.030799421397205727 */ + -926, /* k2g1[29] = -0.028251568071585884 */ + -849 /* k2g1[30] = -0.025914483529091967 */ +}; + +static const EAS_I16 k2g2[] = +{ + 1957, /* k2g2[0] = 0.059711106626580836 */ + 1646, /* k2g2[1] = 0.05024063501786333 */ + 1385, /* k2g2[2] = 0.042272226217199664 */ + 1165, /* k2g2[3] = 0.03556764576567844 */ + 981, /* k2g2[4] = 0.029926444346999134 */ + 825, /* k2g2[5] = 0.025179964880280382 */ + 694, /* k2g2[6] = 0.02118630011706455 */ + 584, /* k2g2[7] = 0.01782604998793514 */ + 491, /* k2g2[8] = 0.014998751854573014 */ + 414, /* k2g2[9] = 0.012619876941179595 */ + 348, /* k2g2[10] = 0.010618303146468736 */ + 293, /* k2g2[11] = 0.008934188679954682 */ + 246, /* k2g2[12] = 0.007517182949855368 */ + 207, /* k2g2[13] = 0.006324921212866403 */ + 174, /* k2g2[14] = 0.005321757979794424 */ + 147, /* k2g2[15] = 0.004477701309210577 */ + 123, /* k2g2[16] = 0.00376751612730811 */ + 104, /* k2g2[17] = 0.0031699697655869644 */ + 87, /* k2g2[18] = 0.00266719715992703 */ + 74, /* k2g2[19] = 0.0022441667321724647 */ + 62, /* k2g2[20] = 0.0018882309854916855 */ + 52, /* k2g2[21] = 0.0015887483774966232 */ + 44, /* k2g2[22] = 0.0013367651661223448 */ + 37, /* k2g2[23] = 0.0011247477162958733 */ + 31, /* k2g2[24] = 0.0009463572640678758 */ + 26, /* k2g2[25] = 0.0007962604042473498 */ + 22, /* k2g2[26] = 0.0006699696356181593 */ + 18, /* k2g2[27] = 0.0005637091964589207 */ + 16, /* k2g2[28] = 0.00047430217920125243 */ + 13, /* k2g2[29] = 0.00039907554925166274 */ + 11 /* k2g2[30] = 0.00033578022828973666 */ +}; + +static const EAS_I16 n1g2[] = +{ + 3170, /* n1g2[0] = 0.0967319927350769 */ + 3036, /* n1g2[1] = 0.0926446051254155 */ + 2908, /* n1g2[2] = 0.08872992911818503 */ + 2785, /* n1g2[3] = 0.08498066682523227 */ + 2667, /* n1g2[4] = 0.08138982872895201 */ + 2554, /* n1g2[5] = 0.07795072065216213 */ + 2446, /* n1g2[6] = 0.0746569312785634 */ + 2343, /* n1g2[7] = 0.07150232020051943 */ + 2244, /* n1g2[8] = 0.06848100647187474 */ + 2149, /* n1g2[9] = 0.06558735764447099 */ + 2058, /* n1g2[10] = 0.06281597926792246 */ + 1971, /* n1g2[11] = 0.06016170483307614 */ + 1888, /* n1g2[12] = 0.05761958614040857 */ + 1808, /* n1g2[13] = 0.05518488407540374 */ + 1732, /* n1g2[14] = 0.052853059773715245 */ + 1659, /* n1g2[15] = 0.05061976615964251 */ + 1589, /* n1g2[16] = 0.04848083984214659 */ + 1521, /* n1g2[17] = 0.046432293353298 */ + 1457, /* n1g2[18] = 0.04447030771468711 */ + 1396, /* n1g2[19] = 0.04259122531793907 */ + 1337, /* n1g2[20] = 0.040791543106060944 */ + 1280, /* n1g2[21] = 0.03906790604290942 */ + 1226, /* n1g2[22] = 0.037417100858604564 */ + 1174, /* n1g2[23] = 0.035836050059229754 */ + 1125, /* n1g2[24] = 0.03432180618965023 */ + 1077, /* n1g2[25] = 0.03287154633875494 */ + 1032, /* n1g2[26] = 0.03148256687687814 */ + 988, /* n1g2[27] = 0.030152278415589925 */ + 946, /* n1g2[28] = 0.028878200980459685 */ + 906, /* n1g2[29] = 0.02765795938779331 */ + 868 /* n1g2[30] = 0.02648927881672521 */ +}; + +static const EAS_I16 n1g3[] = +{ + -548, /* n1g3[0] = -0.016714088475899017 */ + -481, /* n1g3[1] = -0.014683605122742116 */ + -423, /* n1g3[2] = -0.012899791676436092 */ + -371, /* n1g3[3] = -0.01133268185193299 */ + -326, /* n1g3[4] = -0.00995594976868754 */ + -287, /* n1g3[5] = -0.008746467702146129 */ + -252, /* n1g3[6] = -0.00768391756106361 */ + -221, /* n1g3[7] = -0.006750449563854721 */ + -194, /* n1g3[8] = -0.005930382380083576 */ + -171, /* n1g3[9] = -0.005209939699767622 */ + -150, /* n1g3[10] = -0.004577018805123356 */ + -132, /* n1g3[11] = -0.004020987256990177 */ + -116, /* n1g3[12] = -0.003532504280467257 */ + -102, /* n1g3[13] = -0.00310336384922047 */ + -89, /* n1g3[14] = -0.002726356832432369 */ + -78, /* n1g3[15] = -0.002395149888601605 */ + -69, /* n1g3[16] = -0.0021041790717285314 */ + -61, /* n1g3[17] = -0.0018485563625771063 */ + -53, /* n1g3[18] = -0.001623987554831628 */ + -47, /* n1g3[19] = -0.0014267001167177025 */ + -41, /* n1g3[20] = -0.0012533798162347005 */ + -36, /* n1g3[21] = -0.0011011150453668693 */ + -32, /* n1g3[22] = -0.0009673479079754438 */ + -28, /* n1g3[23] = -0.0008498312496971563 */ + -24, /* n1g3[24] = -0.0007465909079943587 */ + -21, /* n1g3[25] = -0.0006558925481952733 */ + -19, /* n1g3[26] = -0.0005762125284029567 */ + -17, /* n1g3[27] = -0.0005062123038325457 */ + -15, /* n1g3[28] = -0.0004447159405951901 */ + -13, /* n1g3[29] = -0.00039069036118270117 */ + -11 /* n1g3[30] = -0.00034322798979677605 */ +}; + +/*---------------------------------------------------------------------------- + * WT_SetFilterCoeffs() + *---------------------------------------------------------------------------- + * Purpose: + * Update the Filter parameters + * + * Inputs: + * pVoice - ptr to the voice whose filter we want to update + * pEASData - pointer to overall EAS data structure + * + * Outputs: + * + * Side Effects: + * - updates Filter values for the given voice + *---------------------------------------------------------------------------- +*/ +void WT_SetFilterCoeffs (S_WT_INT_FRAME *pIntFrame, EAS_I32 cutoff, EAS_I32 resonance) +{ + EAS_I32 temp; + + /* + Convert the cutoff, which has had A5 subtracted, using the 2^x approx + Note, this cutoff is related to theta cutoff by + theta = k * 2^x + We use 2^x and incorporate k in the power series coefs instead + */ + cutoff = EAS_Calculate2toX(cutoff); + + /* calculate b2 coef */ + temp = k2g1[resonance] + MULT_AUDIO_COEF(cutoff, k2g2[resonance]); + temp = k2g0 + MULT_AUDIO_COEF(cutoff, temp); + pIntFrame->frame.b2 = temp; + + /* calculate b1 coef */ + temp = MULT_AUDIO_COEF(cutoff, nk1g2); + temp = nk1g0 + MULT_AUDIO_COEF(cutoff, temp); + temp += MULT_AUDIO_COEF(temp, pIntFrame->frame.b2); + pIntFrame->frame.b1 = temp >> 1; + + /* calculate K coef */ + temp = n1g2[resonance] + MULT_AUDIO_COEF(cutoff, n1g3[resonance]); + temp = MULT_AUDIO_COEF(cutoff, temp); + temp = MULT_AUDIO_COEF(cutoff, temp); + pIntFrame->frame.k = temp; +} +#endif + -- cgit v1.2.3