1 /*---------------------------------------------------------------------------- 2 * 3 * File: 4 * eas_wtsynth.c 5 * 6 * Contents and purpose: 7 * Implements the synthesizer functions. 8 * 9 * Copyright Sonic Network Inc. 2004 10 11 * Licensed under the Apache License, Version 2.0 (the "License"); 12 * you may not use this file except in compliance with the License. 13 * You may obtain a copy of the License at 14 * 15 * http://www.apache.org/licenses/LICENSE-2.0 16 * 17 * Unless required by applicable law or agreed to in writing, software 18 * distributed under the License is distributed on an "AS IS" BASIS, 19 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 20 * See the License for the specific language governing permissions and 21 * limitations under the License. 22 * 23 *---------------------------------------------------------------------------- 24 * Revision Control: 25 * $Revision: 795 $ 26 * $Date: 2007-08-01 00:14:45 -0700 (Wed, 01 Aug 2007) $ 27 *---------------------------------------------------------------------------- 28 */ 29 30 // includes 31 #define LOG_TAG "SYNTH" 32 #include "log/log.h" 33 #include <cutils/log.h> 34 35 #include "eas_data.h" 36 #include "eas_report.h" 37 #include "eas_host.h" 38 #include "eas_math.h" 39 #include "eas_synth_protos.h" 40 #include "eas_wtsynth.h" 41 #include "eas_pan.h" 42 43 #ifdef DLS_SYNTHESIZER 44 #include "eas_dlssynth.h" 45 #endif 46 47 #ifdef _METRICS_ENABLED 48 #include "eas_perf.h" 49 #endif 50 51 /* local prototypes */ 52 static EAS_RESULT WT_Initialize(S_VOICE_MGR *pVoiceMgr); 53 static void WT_ReleaseVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum); 54 static void WT_MuteVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum); 55 static void WT_SustainPedal (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, S_SYNTH_CHANNEL *pChannel, EAS_I32 voiceNum); 56 static EAS_RESULT WT_StartVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum, EAS_U16 regionIndex); 57 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); 58 static void WT_UpdateChannel (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, EAS_U8 channel); 59 static EAS_I32 WT_UpdatePhaseInc (S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 pitchCents); 60 static EAS_I32 WT_UpdateGain (S_SYNTH_VOICE *pVoice, S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 gain); 61 static void WT_UpdateEG1 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv); 62 static void WT_UpdateEG2 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv); 63 64 #ifdef EAS_SPLIT_WT_SYNTH 65 extern EAS_BOOL WTE_StartFrame (EAS_FRAME_BUFFER_HANDLE pFrameBuffer); 66 extern EAS_BOOL WTE_EndFrame (EAS_FRAME_BUFFER_HANDLE pFrameBuffer, EAS_I32 *pMixBuffer, EAS_I16 masterGain); 67 #endif 68 69 #ifdef _FILTER_ENABLED 70 static void WT_UpdateFilter (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pIntFrame, const S_ARTICULATION *pArt); 71 #endif 72 73 #ifdef _STATS 74 extern double statsPhaseIncrement; 75 extern double statsMaxPhaseIncrement; 76 extern long statsPhaseSampleCount; 77 extern double statsSampleSize; 78 extern long statsSampleCount; 79 #endif 80 81 /*---------------------------------------------------------------------------- 82 * Synthesizer interface 83 *---------------------------------------------------------------------------- 84 */ 85 86 const S_SYNTH_INTERFACE wtSynth = 87 { 88 WT_Initialize, 89 WT_StartVoice, 90 WT_UpdateVoice, 91 WT_ReleaseVoice, 92 WT_MuteVoice, 93 WT_SustainPedal, 94 WT_UpdateChannel 95 }; 96 97 #ifdef EAS_SPLIT_WT_SYNTH 98 const S_FRAME_INTERFACE wtFrameInterface = 99 { 100 WTE_StartFrame, 101 WTE_EndFrame 102 }; 103 #endif 104 105 /*---------------------------------------------------------------------------- 106 * WT_Initialize() 107 *---------------------------------------------------------------------------- 108 * Purpose: 109 * 110 * Inputs: 111 * pVoice - pointer to voice to initialize 112 * 113 * Outputs: 114 * 115 *---------------------------------------------------------------------------- 116 */ 117 static EAS_RESULT WT_Initialize (S_VOICE_MGR *pVoiceMgr) 118 { 119 EAS_INT i; 120 121 for (i = 0; i < NUM_WT_VOICES; i++) 122 { 123 124 pVoiceMgr->wtVoices[i].artIndex = DEFAULT_ARTICULATION_INDEX; 125 126 pVoiceMgr->wtVoices[i].eg1State = DEFAULT_EG1_STATE; 127 pVoiceMgr->wtVoices[i].eg1Value = DEFAULT_EG1_VALUE; 128 pVoiceMgr->wtVoices[i].eg1Increment = DEFAULT_EG1_INCREMENT; 129 130 pVoiceMgr->wtVoices[i].eg2State = DEFAULT_EG2_STATE; 131 pVoiceMgr->wtVoices[i].eg2Value = DEFAULT_EG2_VALUE; 132 pVoiceMgr->wtVoices[i].eg2Increment = DEFAULT_EG2_INCREMENT; 133 134 /* left and right gain values are needed only if stereo output */ 135 #if (NUM_OUTPUT_CHANNELS == 2) 136 pVoiceMgr->wtVoices[i].gainLeft = DEFAULT_VOICE_GAIN; 137 pVoiceMgr->wtVoices[i].gainRight = DEFAULT_VOICE_GAIN; 138 #endif 139 140 pVoiceMgr->wtVoices[i].phaseFrac = DEFAULT_PHASE_FRAC; 141 pVoiceMgr->wtVoices[i].phaseAccum = DEFAULT_PHASE_INT; 142 143 #ifdef _FILTER_ENABLED 144 pVoiceMgr->wtVoices[i].filter.z1 = DEFAULT_FILTER_ZERO; 145 pVoiceMgr->wtVoices[i].filter.z2 = DEFAULT_FILTER_ZERO; 146 #endif 147 } 148 149 return EAS_TRUE; 150 } 151 152 /*---------------------------------------------------------------------------- 153 * WT_ReleaseVoice() 154 *---------------------------------------------------------------------------- 155 * Purpose: 156 * The selected voice is being released. 157 * 158 * Inputs: 159 * pEASData - pointer to S_EAS_DATA 160 * pVoice - pointer to voice to release 161 * 162 * Outputs: 163 * None 164 *---------------------------------------------------------------------------- 165 */ 166 /*lint -esym(715, pVoice) used in some implementations */ 167 static void WT_ReleaseVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum) 168 { 169 S_WT_VOICE *pWTVoice; 170 const S_ARTICULATION *pArticulation; 171 172 #ifdef DLS_SYNTHESIZER 173 if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) 174 { 175 DLS_ReleaseVoice(pVoiceMgr, pSynth, pVoice, voiceNum); 176 return; 177 } 178 #endif 179 180 pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; 181 pArticulation = &pSynth->pEAS->pArticulations[pWTVoice->artIndex]; 182 183 /* release EG1 */ 184 pWTVoice->eg1State = eEnvelopeStateRelease; 185 pWTVoice->eg1Increment = pArticulation->eg1.releaseTime; 186 187 /* 188 The spec says we should release EG2, but doing so with the current 189 voicing is causing clicks. This fix will need to be coordinated with 190 a new sound library release 191 */ 192 193 /* release EG2 */ 194 pWTVoice->eg2State = eEnvelopeStateRelease; 195 pWTVoice->eg2Increment = pArticulation->eg2.releaseTime; 196 } 197 198 /*---------------------------------------------------------------------------- 199 * WT_MuteVoice() 200 *---------------------------------------------------------------------------- 201 * Purpose: 202 * The selected voice is being muted. 203 * 204 * Inputs: 205 * pVoice - pointer to voice to release 206 * 207 * Outputs: 208 * None 209 *---------------------------------------------------------------------------- 210 */ 211 /*lint -esym(715, pSynth) used in some implementations */ 212 static void WT_MuteVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum) 213 { 214 215 #ifdef DLS_SYNTHESIZER 216 if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) 217 { 218 DLS_MuteVoice(pVoiceMgr, pSynth, pVoice, voiceNum); 219 return; 220 } 221 #endif 222 223 /* clear deferred action flags */ 224 pVoice->voiceFlags &= 225 ~(VOICE_FLAG_DEFER_MIDI_NOTE_OFF | 226 VOICE_FLAG_SUSTAIN_PEDAL_DEFER_NOTE_OFF | 227 VOICE_FLAG_DEFER_MUTE); 228 229 /* set the envelope state */ 230 pVoiceMgr->wtVoices[voiceNum].eg1State = eEnvelopeStateMuted; 231 pVoiceMgr->wtVoices[voiceNum].eg2State = eEnvelopeStateMuted; 232 } 233 234 /*---------------------------------------------------------------------------- 235 * WT_SustainPedal() 236 *---------------------------------------------------------------------------- 237 * Purpose: 238 * The selected voice is held due to sustain pedal 239 * 240 * Inputs: 241 * pVoice - pointer to voice to sustain 242 * 243 * Outputs: 244 * None 245 *---------------------------------------------------------------------------- 246 */ 247 /*lint -esym(715, pChannel) used in some implementations */ 248 static void WT_SustainPedal (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, S_SYNTH_CHANNEL *pChannel, EAS_I32 voiceNum) 249 { 250 S_WT_VOICE *pWTVoice; 251 252 #ifdef DLS_SYNTHESIZER 253 if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) 254 { 255 DLS_SustainPedal(pVoiceMgr, pSynth, pVoice, pChannel, voiceNum); 256 return; 257 } 258 #endif 259 260 /* don't catch the voice if below the sustain level */ 261 pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; 262 if (pWTVoice->eg1Value < pSynth->pEAS->pArticulations[pWTVoice->artIndex].eg1.sustainLevel) 263 return; 264 265 /* sustain flag is set, damper pedal is on */ 266 /* defer releasing this note until the damper pedal is off */ 267 pWTVoice->eg1State = eEnvelopeStateDecay; 268 pVoice->voiceState = eVoiceStatePlay; 269 270 /* 271 because sustain pedal is on, this voice 272 should defer releasing its note 273 */ 274 pVoice->voiceFlags |= VOICE_FLAG_SUSTAIN_PEDAL_DEFER_NOTE_OFF; 275 276 #ifdef _DEBUG_SYNTH 277 { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_SustainPedal: defer note off because sustain pedal is on\n"); */ } 278 #endif 279 } 280 281 /*---------------------------------------------------------------------------- 282 * WT_StartVoice() 283 *---------------------------------------------------------------------------- 284 * Purpose: 285 * Assign the region for the given instrument using the midi key number 286 * and the RPN2 (coarse tuning) value. By using RPN2 as part of the 287 * region selection process, we reduce the amount a given sample has 288 * to be transposed by selecting the closest recorded root instead. 289 * 290 * This routine is the second half of SynthAssignRegion(). 291 * If the region was successfully found by SynthFindRegionIndex(), 292 * then assign the region's parameters to the voice. 293 * 294 * Setup and initialize the following voice parameters: 295 * m_nRegionIndex 296 * 297 * Inputs: 298 * pVoice - ptr to the voice we have assigned for this channel 299 * nRegionIndex - index of the region 300 * pEASData - pointer to overall EAS data structure 301 * 302 * Outputs: 303 * success - could find and assign the region for this voice's note otherwise 304 * failure - could not find nor assign the region for this voice's note 305 * 306 * Side Effects: 307 * psSynthObject->m_sVoice[].m_nRegionIndex is assigned 308 * psSynthObject->m_sVoice[] parameters are assigned 309 *---------------------------------------------------------------------------- 310 */ 311 static EAS_RESULT WT_StartVoice (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, S_SYNTH_VOICE *pVoice, EAS_I32 voiceNum, EAS_U16 regionIndex) 312 { 313 S_WT_VOICE *pWTVoice; 314 const S_WT_REGION *pRegion; 315 const S_ARTICULATION *pArt; 316 S_SYNTH_CHANNEL *pChannel; 317 318 #if (NUM_OUTPUT_CHANNELS == 2) 319 EAS_INT pan; 320 #endif 321 322 #ifdef EAS_SPLIT_WT_SYNTH 323 S_WT_CONFIG wtConfig; 324 #endif 325 326 /* no samples have been synthesized for this note yet */ 327 pVoice->regionIndex = regionIndex; 328 pVoice->voiceFlags = VOICE_FLAG_NO_SAMPLES_SYNTHESIZED_YET; 329 330 /* get the articulation index for this region */ 331 pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; 332 pChannel = &pSynth->channels[pVoice->channel & 15]; 333 334 /* update static channel parameters */ 335 if (pChannel->channelFlags & CHANNEL_FLAG_UPDATE_CHANNEL_PARAMETERS) 336 WT_UpdateChannel(pVoiceMgr, pSynth, pVoice->channel & 15); 337 338 #ifdef DLS_SYNTHESIZER 339 if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) 340 return DLS_StartVoice(pVoiceMgr, pSynth, pVoice, voiceNum, regionIndex); 341 #endif 342 343 pRegion = &(pSynth->pEAS->pWTRegions[regionIndex]); 344 pWTVoice->artIndex = pRegion->artIndex; 345 346 #ifdef _DEBUG_SYNTH 347 { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_StartVoice: Voice %ld; Region %d\n", (EAS_I32) (pVoice - pVoiceMgr->voices), regionIndex); */ } 348 #endif 349 350 pArt = &pSynth->pEAS->pArticulations[pWTVoice->artIndex]; 351 352 /* MIDI note on puts this voice into attack state */ 353 pWTVoice->eg1State = eEnvelopeStateAttack; 354 pWTVoice->eg1Value = 0; 355 pWTVoice->eg1Increment = pArt->eg1.attackTime; 356 pWTVoice->eg2State = eEnvelopeStateAttack; 357 pWTVoice->eg2Value = 0; 358 pWTVoice->eg2Increment = pArt->eg2.attackTime; 359 360 /* init the LFO */ 361 pWTVoice->modLFO.lfoValue = 0; 362 pWTVoice->modLFO.lfoPhase = -pArt->lfoDelay; 363 364 pVoice->gain = 0; 365 366 #if (NUM_OUTPUT_CHANNELS == 2) 367 /* 368 Get the Midi CC10 pan value for this voice's channel 369 convert the pan value to an "angle" representation suitable for 370 our sin, cos calculator. This representation is NOT necessarily the same 371 as the transform in the GM manuals because of our sin, cos calculator. 372 "angle" = (CC10 - 64)/128 373 */ 374 pan = (EAS_INT) pSynth->channels[pVoice->channel & 15].pan - 64; 375 pan += pArt->pan; 376 EAS_CalcPanControl(pan, &pWTVoice->gainLeft, &pWTVoice->gainRight); 377 #endif 378 379 #ifdef _FILTER_ENABLED 380 /* clear out the filter states */ 381 pWTVoice->filter.z1 = 0; 382 pWTVoice->filter.z2 = 0; 383 #endif 384 385 /* if this wave is to be generated using noise generator */ 386 if (pRegion->region.keyGroupAndFlags & REGION_FLAG_USE_WAVE_GENERATOR) 387 { 388 pWTVoice->phaseAccum = 4574296; 389 pWTVoice->loopStart = WT_NOISE_GENERATOR; 390 pWTVoice->loopEnd = 4574295; 391 } 392 393 /* normal sample */ 394 else 395 { 396 397 #ifdef EAS_SPLIT_WT_SYNTH 398 if (voiceNum < NUM_PRIMARY_VOICES) 399 pWTVoice->phaseAccum = (EAS_U32) pSynth->pEAS->pSamples + pSynth->pEAS->pSampleOffsets[pRegion->waveIndex]; 400 else 401 pWTVoice->phaseAccum = pSynth->pEAS->pSampleOffsets[pRegion->waveIndex]; 402 #else 403 pWTVoice->phaseAccum = (EAS_U32) pSynth->pEAS->pSamples + pSynth->pEAS->pSampleOffsets[pRegion->waveIndex]; 404 #endif 405 406 if (pRegion->region.keyGroupAndFlags & REGION_FLAG_IS_LOOPED) 407 { 408 pWTVoice->loopStart = pWTVoice->phaseAccum + pRegion->loopStart; 409 pWTVoice->loopEnd = pWTVoice->phaseAccum + pRegion->loopEnd - 1; 410 } 411 else 412 pWTVoice->loopStart = pWTVoice->loopEnd = pWTVoice->phaseAccum + pSynth->pEAS->pSampleLen[pRegion->waveIndex] - 1; 413 } 414 415 #ifdef EAS_SPLIT_WT_SYNTH 416 /* configure off-chip voices */ 417 if (voiceNum >= NUM_PRIMARY_VOICES) 418 { 419 wtConfig.phaseAccum = pWTVoice->phaseAccum; 420 wtConfig.loopStart = pWTVoice->loopStart; 421 wtConfig.loopEnd = pWTVoice->loopEnd; 422 wtConfig.gain = pVoice->gain; 423 424 #if (NUM_OUTPUT_CHANNELS == 2) 425 wtConfig.gainLeft = pWTVoice->gainLeft; 426 wtConfig.gainRight = pWTVoice->gainRight; 427 #endif 428 429 WTE_ConfigVoice(voiceNum - NUM_PRIMARY_VOICES, &wtConfig, pVoiceMgr->pFrameBuffer); 430 } 431 #endif 432 433 return EAS_SUCCESS; 434 } 435 436 /*---------------------------------------------------------------------------- 437 * WT_CheckSampleEnd 438 *---------------------------------------------------------------------------- 439 * Purpose: 440 * Check for end of sample and calculate number of samples to synthesize 441 * 442 * Inputs: 443 * 444 * Outputs: 445 * 446 * Notes: 447 * 448 *---------------------------------------------------------------------------- 449 */ 450 EAS_BOOL WT_CheckSampleEnd (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pWTIntFrame, EAS_BOOL update) 451 { 452 EAS_U32 endPhaseAccum; 453 EAS_U32 endPhaseFrac; 454 EAS_I32 numSamples; 455 EAS_BOOL done = EAS_FALSE; 456 457 /* check to see if we hit the end of the waveform this time */ 458 /*lint -e{703} use shift for performance */ 459 endPhaseFrac = pWTVoice->phaseFrac + (pWTIntFrame->frame.phaseIncrement << SYNTH_UPDATE_PERIOD_IN_BITS); 460 endPhaseAccum = pWTVoice->phaseAccum + GET_PHASE_INT_PART(endPhaseFrac); 461 if (endPhaseAccum >= pWTVoice->loopEnd) 462 { 463 /* calculate how far current ptr is from end */ 464 numSamples = (EAS_I32) (pWTVoice->loopEnd - pWTVoice->phaseAccum); 465 466 /* now account for the fractional portion */ 467 /*lint -e{703} use shift for performance */ 468 numSamples = (EAS_I32) ((numSamples << NUM_PHASE_FRAC_BITS) - pWTVoice->phaseFrac); 469 if (pWTIntFrame->frame.phaseIncrement) { 470 pWTIntFrame->numSamples = 1 + (numSamples / pWTIntFrame->frame.phaseIncrement); 471 } else { 472 pWTIntFrame->numSamples = numSamples; 473 } 474 if (pWTIntFrame->numSamples < 0) { 475 ALOGE("b/26366256"); 476 android_errorWriteLog(0x534e4554, "26366256"); 477 pWTIntFrame->numSamples = 0; 478 } 479 480 /* sound will be done this frame */ 481 done = EAS_TRUE; 482 } 483 484 /* update data for off-chip synth */ 485 if (update) 486 { 487 pWTVoice->phaseFrac = endPhaseFrac; 488 pWTVoice->phaseAccum = endPhaseAccum; 489 } 490 491 return done; 492 } 493 494 /*---------------------------------------------------------------------------- 495 * WT_UpdateVoice() 496 *---------------------------------------------------------------------------- 497 * Purpose: 498 * Synthesize a block of samples for the given voice. 499 * Use linear interpolation. 500 * 501 * Inputs: 502 * pEASData - pointer to overall EAS data structure 503 * 504 * Outputs: 505 * number of samples actually written to buffer 506 * 507 * Side Effects: 508 * - samples are added to the presently free buffer 509 * 510 *---------------------------------------------------------------------------- 511 */ 512 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) 513 { 514 S_WT_VOICE *pWTVoice; 515 S_WT_INT_FRAME intFrame; 516 S_SYNTH_CHANNEL *pChannel; 517 const S_WT_REGION *pWTRegion; 518 const S_ARTICULATION *pArt; 519 EAS_I32 temp; 520 EAS_BOOL done; 521 522 #ifdef DLS_SYNTHESIZER 523 if (pVoice->regionIndex & FLAG_RGN_IDX_DLS_SYNTH) 524 return DLS_UpdateVoice(pVoiceMgr, pSynth, pVoice, voiceNum, pMixBuffer, numSamples); 525 #endif 526 527 /* establish pointers to critical data */ 528 pWTVoice = &pVoiceMgr->wtVoices[voiceNum]; 529 pWTRegion = &pSynth->pEAS->pWTRegions[pVoice->regionIndex & REGION_INDEX_MASK]; 530 pArt = &pSynth->pEAS->pArticulations[pWTVoice->artIndex]; 531 pChannel = &pSynth->channels[pVoice->channel & 15]; 532 intFrame.prevGain = pVoice->gain; 533 534 /* update the envelopes */ 535 WT_UpdateEG1(pWTVoice, &pArt->eg1); 536 WT_UpdateEG2(pWTVoice, &pArt->eg2); 537 538 /* update the LFO */ 539 WT_UpdateLFO(&pWTVoice->modLFO, pArt->lfoFreq); 540 541 #ifdef _FILTER_ENABLED 542 /* calculate filter if library uses filter */ 543 if (pSynth->pEAS->libAttr & LIB_FORMAT_FILTER_ENABLED) 544 WT_UpdateFilter(pWTVoice, &intFrame, pArt); 545 else 546 intFrame.frame.k = 0; 547 #endif 548 549 /* update the gain */ 550 intFrame.frame.gainTarget = WT_UpdateGain(pVoice, pWTVoice, pArt, pChannel, pWTRegion->gain); 551 552 /* calculate base pitch*/ 553 temp = pChannel->staticPitch + pWTRegion->tuning; 554 555 /* include global transpose */ 556 if (pChannel->channelFlags & CHANNEL_FLAG_RHYTHM_CHANNEL) 557 temp += pVoice->note * 100; 558 else 559 temp += (pVoice->note + pSynth->globalTranspose) * 100; 560 intFrame.frame.phaseIncrement = WT_UpdatePhaseInc(pWTVoice, pArt, pChannel, temp); 561 temp = pWTVoice->loopEnd - pWTVoice->loopStart; 562 if (temp != 0) { 563 temp = temp << NUM_PHASE_FRAC_BITS; 564 if (intFrame.frame.phaseIncrement > temp) { 565 ALOGW("%p phaseIncrement=%d", pWTVoice, (int)intFrame.frame.phaseIncrement); 566 intFrame.frame.phaseIncrement %= temp; 567 } 568 } 569 570 /* call into engine to generate samples */ 571 intFrame.pAudioBuffer = pVoiceMgr->voiceBuffer; 572 intFrame.pMixBuffer = pMixBuffer; 573 intFrame.numSamples = numSamples; 574 575 /* check for end of sample */ 576 if ((pWTVoice->loopStart != WT_NOISE_GENERATOR) && (pWTVoice->loopStart == pWTVoice->loopEnd)) 577 done = WT_CheckSampleEnd(pWTVoice, &intFrame, (EAS_BOOL) (voiceNum >= NUM_PRIMARY_VOICES)); 578 else 579 done = EAS_FALSE; 580 581 if (intFrame.numSamples < 0) intFrame.numSamples = 0; 582 583 if (intFrame.numSamples > BUFFER_SIZE_IN_MONO_SAMPLES) 584 intFrame.numSamples = BUFFER_SIZE_IN_MONO_SAMPLES; 585 586 #ifdef EAS_SPLIT_WT_SYNTH 587 if (voiceNum < NUM_PRIMARY_VOICES) 588 { 589 #ifndef _SPLIT_WT_TEST_HARNESS 590 WT_ProcessVoice(pWTVoice, &intFrame); 591 #endif 592 } 593 else 594 WTE_ProcessVoice(voiceNum - NUM_PRIMARY_VOICES, &intFrame.frame, pVoiceMgr->pFrameBuffer); 595 #else 596 WT_ProcessVoice(pWTVoice, &intFrame); 597 #endif 598 599 /* clear flag */ 600 pVoice->voiceFlags &= ~VOICE_FLAG_NO_SAMPLES_SYNTHESIZED_YET; 601 602 /* if voice has finished, set flag for voice manager */ 603 if ((pVoice->voiceState != eVoiceStateStolen) && (pWTVoice->eg1State == eEnvelopeStateMuted)) 604 done = EAS_TRUE; 605 606 /* if the update interval has elapsed, then force the current gain to the next 607 * gain since we never actually reach the next gain when ramping -- we just get 608 * very close to the target gain. 609 */ 610 pVoice->gain = (EAS_I16) intFrame.frame.gainTarget; 611 612 return done; 613 } 614 615 /*---------------------------------------------------------------------------- 616 * WT_UpdatePhaseInc() 617 *---------------------------------------------------------------------------- 618 * Purpose: 619 * Calculate the phase increment 620 * 621 * Inputs: 622 * pVoice - pointer to the voice being updated 623 * psRegion - pointer to the region 624 * psArticulation - pointer to the articulation 625 * nChannelPitchForThisVoice - the portion of the pitch that is fixed for this 626 * voice during the duration of this synthesis 627 * pEASData - pointer to overall EAS data structure 628 * 629 * Outputs: 630 * 631 * Side Effects: 632 * set the phase increment for this voice 633 *---------------------------------------------------------------------------- 634 */ 635 static EAS_I32 WT_UpdatePhaseInc (S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 pitchCents) 636 { 637 EAS_I32 temp; 638 639 /*pitchCents due to CC1 = LFO * (CC1 / 128) * DEFAULT_LFO_MOD_WHEEL_TO_PITCH_CENTS */ 640 temp = MULT_EG1_EG1(DEFAULT_LFO_MOD_WHEEL_TO_PITCH_CENTS, 641 ((pChannel->modWheel) << (NUM_EG1_FRAC_BITS -7))); 642 643 /* pitchCents due to channel pressure = LFO * (channel pressure / 128) * DEFAULT_LFO_CHANNEL_PRESSURE_TO_PITCH_CENTS */ 644 temp += MULT_EG1_EG1(DEFAULT_LFO_CHANNEL_PRESSURE_TO_PITCH_CENTS, 645 ((pChannel->channelPressure) << (NUM_EG1_FRAC_BITS -7))); 646 647 /* now multiply the (channel pressure + CC1) pitch values by the LFO value */ 648 temp = MULT_EG1_EG1(pWTVoice->modLFO.lfoValue, temp); 649 650 /* 651 add in the LFO pitch due to 652 channel pressure and CC1 along with 653 the LFO pitch, the EG2 pitch, and the 654 "static" pitch for this voice on this channel 655 */ 656 temp += pitchCents + 657 (MULT_EG1_EG1(pWTVoice->eg2Value, pArt->eg2ToPitch)) + 658 (MULT_EG1_EG1(pWTVoice->modLFO.lfoValue, pArt->lfoToPitch)); 659 660 /* convert from cents to linear phase increment */ 661 return EAS_Calculate2toX(temp); 662 } 663 664 /*---------------------------------------------------------------------------- 665 * WT_UpdateChannel() 666 *---------------------------------------------------------------------------- 667 * Purpose: 668 * Calculate and assign static channel parameters 669 * These values only need to be updated if one of the controller values 670 * for this channel changes 671 * 672 * Inputs: 673 * nChannel - channel to update 674 * pEASData - pointer to overall EAS data structure 675 * 676 * Outputs: 677 * 678 * Side Effects: 679 * - the given channel's static gain and static pitch are updated 680 *---------------------------------------------------------------------------- 681 */ 682 /*lint -esym(715, pVoiceMgr) reserved for future use */ 683 static void WT_UpdateChannel (S_VOICE_MGR *pVoiceMgr, S_SYNTH *pSynth, EAS_U8 channel) 684 { 685 EAS_I32 staticGain; 686 EAS_I32 pitchBend; 687 S_SYNTH_CHANNEL *pChannel; 688 689 pChannel = &pSynth->channels[channel]; 690 691 /* 692 nChannelGain = (CC7 * CC11)^2 * master volume 693 where CC7 == 100 by default, CC11 == 127, master volume == 32767 694 */ 695 staticGain = MULT_EG1_EG1((pChannel->volume) << (NUM_EG1_FRAC_BITS - 7), 696 (pChannel->expression) << (NUM_EG1_FRAC_BITS - 7)); 697 698 /* staticGain has to be squared */ 699 staticGain = MULT_EG1_EG1(staticGain, staticGain); 700 701 pChannel->staticGain = (EAS_I16) MULT_EG1_EG1(staticGain, pSynth->masterVolume); 702 703 /* 704 calculate pitch bend: RPN0 * ((2*pitch wheel)/16384 -1) 705 However, if we use the EG1 macros, remember that EG1 has a full 706 scale value of 32768 (instead of 16384). So instead of multiplying 707 by 2, multiply by 4 (left shift by 2), and subtract by 32768 instead 708 of 16384. This utilizes the fact that the EG1 macro places a binary 709 point 15 places to the left instead of 14 places. 710 */ 711 /*lint -e{703} <avoid multiply for performance>*/ 712 pitchBend = 713 (((EAS_I32)(pChannel->pitchBend) << 2) 714 - 32768); 715 716 pChannel->staticPitch = 717 MULT_EG1_EG1(pitchBend, pChannel->pitchBendSensitivity); 718 719 /* if this is not a drum channel, then add in the per-channel tuning */ 720 if (!(pChannel->channelFlags & CHANNEL_FLAG_RHYTHM_CHANNEL)) 721 pChannel->staticPitch += pChannel->finePitch + (pChannel->coarsePitch * 100); 722 723 /* clear update flag */ 724 pChannel->channelFlags &= ~CHANNEL_FLAG_UPDATE_CHANNEL_PARAMETERS; 725 return; 726 } 727 728 /*---------------------------------------------------------------------------- 729 * WT_UpdateGain() 730 *---------------------------------------------------------------------------- 731 * Purpose: 732 * Calculate and assign static voice parameters as part of WT_UpdateVoice() 733 * 734 * Inputs: 735 * pVoice - ptr to the synth voice that we want to synthesize 736 * pEASData - pointer to overall EAS data structure 737 * 738 * Outputs: 739 * 740 * Side Effects: 741 * - various voice parameters are calculated and assigned 742 * 743 *---------------------------------------------------------------------------- 744 */ 745 static EAS_I32 WT_UpdateGain (S_SYNTH_VOICE *pVoice, S_WT_VOICE *pWTVoice, const S_ARTICULATION *pArt, S_SYNTH_CHANNEL *pChannel, EAS_I32 gain) 746 { 747 EAS_I32 lfoGain; 748 EAS_I32 temp; 749 750 /* 751 If this voice was stolen, then the velocity is actually 752 for the new note, not the note that we are currently ramping down. 753 So we really shouldn't use this velocity. However, that would require 754 more memory to store the velocity value, and the improvement may 755 not be sufficient to warrant the added memory. 756 */ 757 /* velocity is fixed at note start for a given voice and must be squared */ 758 temp = (pVoice->velocity) << (NUM_EG1_FRAC_BITS - 7); 759 temp = MULT_EG1_EG1(temp, temp); 760 761 /* region gain is fixed as part of the articulation */ 762 temp = MULT_EG1_EG1(temp, gain); 763 764 /* include the channel gain */ 765 temp = MULT_EG1_EG1(temp, pChannel->staticGain); 766 767 /* calculate LFO gain using an approximation for 10^x */ 768 lfoGain = MULT_EG1_EG1(pWTVoice->modLFO.lfoValue, pArt->lfoToGain); 769 lfoGain = MULT_EG1_EG1(lfoGain, LFO_GAIN_TO_CENTS); 770 771 /* convert from a dB-like value to linear gain */ 772 lfoGain = EAS_Calculate2toX(lfoGain); 773 temp = MULT_EG1_EG1(temp, lfoGain); 774 775 /* calculate the voice's gain */ 776 temp = (EAS_I16)MULT_EG1_EG1(temp, pWTVoice->eg1Value); 777 778 return temp; 779 } 780 781 /*---------------------------------------------------------------------------- 782 * WT_UpdateEG1() 783 *---------------------------------------------------------------------------- 784 * Purpose: 785 * Calculate the EG1 envelope for the given voice (but do not update any 786 * state) 787 * 788 * Inputs: 789 * pVoice - ptr to the voice whose envelope we want to update 790 * nVoice - this voice's number - used only for debug 791 * pEASData - pointer to overall EAS data structure 792 * 793 * Outputs: 794 * nValue - the envelope value 795 * 796 * Side Effects: 797 * - updates EG1 state value for the given voice 798 *---------------------------------------------------------------------------- 799 */ 800 static void WT_UpdateEG1 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv) 801 { 802 EAS_I32 temp; 803 804 switch (pWTVoice->eg1State) 805 { 806 case eEnvelopeStateAttack: 807 temp = pWTVoice->eg1Value + pWTVoice->eg1Increment; 808 809 /* check if we have reached peak amplitude */ 810 if (temp >= SYNTH_FULL_SCALE_EG1_GAIN) 811 { 812 /* limit the volume */ 813 temp = SYNTH_FULL_SCALE_EG1_GAIN; 814 815 /* prepare to move to decay state */ 816 pWTVoice->eg1State = eEnvelopeStateDecay; 817 pWTVoice->eg1Increment = pEnv->decayTime; 818 } 819 820 break; 821 822 /* exponential decay */ 823 case eEnvelopeStateDecay: 824 temp = MULT_EG1_EG1(pWTVoice->eg1Value, pWTVoice->eg1Increment); 825 826 /* check if we have reached sustain level */ 827 if (temp <= pEnv->sustainLevel) 828 { 829 /* enforce the sustain level */ 830 temp = pEnv->sustainLevel; 831 832 /* if sustain level is zero, skip sustain & release the voice */ 833 if (temp > 0) 834 pWTVoice->eg1State = eEnvelopeStateSustain; 835 836 /* move to sustain state */ 837 else 838 pWTVoice->eg1State = eEnvelopeStateMuted; 839 } 840 841 break; 842 843 case eEnvelopeStateSustain: 844 return; 845 846 case eEnvelopeStateRelease: 847 temp = MULT_EG1_EG1(pWTVoice->eg1Value, pWTVoice->eg1Increment); 848 849 /* if we hit zero, this voice isn't contributing any audio */ 850 if (temp <= 0) 851 { 852 temp = 0; 853 pWTVoice->eg1State = eEnvelopeStateMuted; 854 } 855 break; 856 857 /* voice is muted, set target to zero */ 858 case eEnvelopeStateMuted: 859 temp = 0; 860 break; 861 862 case eEnvelopeStateInvalid: 863 default: 864 temp = 0; 865 #ifdef _DEBUG_SYNTH 866 { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_UpdateEG1: error, %d is an unrecognized state\n", 867 pWTVoice->eg1State); */ } 868 #endif 869 break; 870 871 } 872 873 pWTVoice->eg1Value = (EAS_I16) temp; 874 } 875 876 /*---------------------------------------------------------------------------- 877 * WT_UpdateEG2() 878 *---------------------------------------------------------------------------- 879 * Purpose: 880 * Update the EG2 envelope for the given voice 881 * 882 * Inputs: 883 * pVoice - ptr to the voice whose envelope we want to update 884 * pEASData - pointer to overall EAS data structure 885 * 886 * Outputs: 887 * 888 * Side Effects: 889 * - updates EG2 values for the given voice 890 *---------------------------------------------------------------------------- 891 */ 892 893 static void WT_UpdateEG2 (S_WT_VOICE *pWTVoice, const S_ENVELOPE *pEnv) 894 { 895 EAS_I32 temp; 896 897 switch (pWTVoice->eg2State) 898 { 899 case eEnvelopeStateAttack: 900 temp = pWTVoice->eg2Value + pWTVoice->eg2Increment; 901 902 /* check if we have reached peak amplitude */ 903 if (temp >= SYNTH_FULL_SCALE_EG1_GAIN) 904 { 905 /* limit the volume */ 906 temp = SYNTH_FULL_SCALE_EG1_GAIN; 907 908 /* prepare to move to decay state */ 909 pWTVoice->eg2State = eEnvelopeStateDecay; 910 911 pWTVoice->eg2Increment = pEnv->decayTime; 912 } 913 914 break; 915 916 /* implement linear pitch decay in cents */ 917 case eEnvelopeStateDecay: 918 temp = pWTVoice->eg2Value -pWTVoice->eg2Increment; 919 920 /* check if we have reached sustain level */ 921 if (temp <= pEnv->sustainLevel) 922 { 923 /* enforce the sustain level */ 924 temp = pEnv->sustainLevel; 925 926 /* prepare to move to sustain state */ 927 pWTVoice->eg2State = eEnvelopeStateSustain; 928 } 929 break; 930 931 case eEnvelopeStateSustain: 932 return; 933 934 case eEnvelopeStateRelease: 935 temp = pWTVoice->eg2Value - pWTVoice->eg2Increment; 936 937 if (temp <= 0) 938 { 939 temp = 0; 940 pWTVoice->eg2State = eEnvelopeStateMuted; 941 } 942 943 break; 944 945 /* voice is muted, set target to zero */ 946 case eEnvelopeStateMuted: 947 temp = 0; 948 break; 949 950 case eEnvelopeStateInvalid: 951 default: 952 temp = 0; 953 #ifdef _DEBUG_SYNTH 954 { /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WT_UpdateEG2: error, %d is an unrecognized state\n", 955 pWTVoice->eg2State); */ } 956 #endif 957 break; 958 } 959 960 pWTVoice->eg2Value = (EAS_I16) temp; 961 } 962 963 /*---------------------------------------------------------------------------- 964 * WT_UpdateLFO () 965 *---------------------------------------------------------------------------- 966 * Purpose: 967 * Calculate the LFO for the given voice 968 * 969 * Inputs: 970 * pLFO - ptr to the LFO data 971 * phaseInc - phase increment 972 * 973 * Outputs: 974 * 975 * Side Effects: 976 * - updates LFO values for the given voice 977 *---------------------------------------------------------------------------- 978 */ 979 void WT_UpdateLFO (S_LFO_CONTROL *pLFO, EAS_I16 phaseInc) 980 { 981 982 /* To save memory, if m_nPhaseValue is negative, we are in the 983 * delay phase, and m_nPhaseValue represents the time left 984 * in the delay. 985 */ 986 if (pLFO->lfoPhase < 0) 987 { 988 pLFO->lfoPhase++; 989 return; 990 } 991 992 /* calculate LFO output from phase value */ 993 /*lint -e{701} Use shift for performance */ 994 pLFO->lfoValue = (EAS_I16) (pLFO->lfoPhase << 2); 995 /*lint -e{502} <shortcut to turn sawtooth into triangle wave> */ 996 if ((pLFO->lfoPhase > 0x1fff) && (pLFO->lfoPhase < 0x6000)) 997 pLFO->lfoValue = ~pLFO->lfoValue; 998 999 /* update LFO phase */ 1000 pLFO->lfoPhase = (pLFO->lfoPhase + phaseInc) & 0x7fff; 1001 } 1002 1003 #ifdef _FILTER_ENABLED 1004 /*---------------------------------------------------------------------------- 1005 * WT_UpdateFilter() 1006 *---------------------------------------------------------------------------- 1007 * Purpose: 1008 * Update the Filter parameters 1009 * 1010 * Inputs: 1011 * pVoice - ptr to the voice whose filter we want to update 1012 * pEASData - pointer to overall EAS data structure 1013 * 1014 * Outputs: 1015 * 1016 * Side Effects: 1017 * - updates Filter values for the given voice 1018 *---------------------------------------------------------------------------- 1019 */ 1020 static void WT_UpdateFilter (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pIntFrame, const S_ARTICULATION *pArt) 1021 { 1022 EAS_I32 cutoff; 1023 1024 /* no need to calculate filter coefficients if it is bypassed */ 1025 if (pArt->filterCutoff == DEFAULT_EAS_FILTER_CUTOFF_FREQUENCY) 1026 { 1027 pIntFrame->frame.k = 0; 1028 return; 1029 } 1030 1031 /* determine the dynamic cutoff frequency */ 1032 cutoff = MULT_EG1_EG1(pWTVoice->eg2Value, pArt->eg2ToFc); 1033 cutoff += pArt->filterCutoff; 1034 1035 /* subtract the A5 offset and the sampling frequency */ 1036 cutoff -= FILTER_CUTOFF_FREQ_ADJUST + A5_PITCH_OFFSET_IN_CENTS; 1037 1038 /* limit the cutoff frequency */ 1039 if (cutoff > FILTER_CUTOFF_MAX_PITCH_CENTS) 1040 cutoff = FILTER_CUTOFF_MAX_PITCH_CENTS; 1041 else if (cutoff < FILTER_CUTOFF_MIN_PITCH_CENTS) 1042 cutoff = FILTER_CUTOFF_MIN_PITCH_CENTS; 1043 1044 WT_SetFilterCoeffs(pIntFrame, cutoff, pArt->filterQ); 1045 } 1046 #endif 1047 1048 #if defined(_FILTER_ENABLED) || defined(DLS_SYNTHESIZER) 1049 /*---------------------------------------------------------------------------- 1050 * coef 1051 *---------------------------------------------------------------------------- 1052 * Table of filter coefficients for low-pass filter 1053 *---------------------------------------------------------------------------- 1054 * 1055 * polynomial coefficients are based on 8kHz sampling frequency 1056 * filter coef b2 = k2 = k2g0*k^0 + k2g1*k^1*(2^x) + k2g2*k^2*(2^x) 1057 * 1058 *where k2g0, k2g1, k2g2 are from the truncated power series expansion on theta 1059 *(k*2^x = theta, but we incorporate the k along with the k2g0, k2g1, k2g2) 1060 *note: this is a power series in 2^x, not k*2^x 1061 *where k = (2*pi*440)/8kHz == convert octaves to radians 1062 * 1063 * so actually, the following coefs listed as k2g0, k2g1, k2g2 are really 1064 * k2g0*k^0 = k2g0 1065 * k2g1*k^1 1066 * k2g2*k^2 1067 * 1068 * 1069 * filter coef n1 = numerator = n1g0*k^0 + n1g1*k^1*(2^x) + n1g2*k^2*(2^x) + n1g3*k^3*(2^x) 1070 * 1071 *where n1g0, n1g1, n1g2, n1g3 are from the truncated power series expansion on theta 1072 *(k*2^x = theta, but we incorporate the k along with the n1g0, n1g1, n1g2, n2g3) 1073 *note: this is a power series in 2^x, not k*2^x 1074 *where k = (2*pi*440)/8kHz == convert octaves to radians 1075 *we also include the optimization factor of 0.81 1076 * 1077 * so actually, the following coefs listed as n1g0, n1g1, n1g2, n2g3 are really 1078 * n1g0*k^0 = n1g0 1079 * n1g1*k^1 1080 * n1g2*k^2 1081 * n1g3*k^3 1082 * 1083 * NOTE that n1g0 == n1g1 == 0, always, so we only need to store n1g2 and n1g3 1084 *---------------------------------------------------------------------------- 1085 */ 1086 1087 static const EAS_I16 nk1g0 = -32768; 1088 static const EAS_I16 nk1g2 = 1580; 1089 static const EAS_I16 k2g0 = 32767; 1090 1091 static const EAS_I16 k2g1[] = 1092 { 1093 -11324, /* k2g1[0] = -0.3455751918948761 */ 1094 -10387, /* k2g1[1] = -0.3169878073928751 */ 1095 -9528, /* k2g1[2] = -0.29076528753345476 */ 1096 -8740, /* k2g1[3] = -0.2667120011011279 */ 1097 -8017, /* k2g1[4] = -0.24464850028971705 */ 1098 -7353, /* k2g1[5] = -0.22441018194495696 */ 1099 -6745, /* k2g1[6] = -0.20584605955455101 */ 1100 -6187, /* k2g1[7] = -0.18881763682420102 */ 1101 -5675, /* k2g1[8] = -0.1731978744360067 */ 1102 -5206, /* k2g1[9] = -0.15887024228080968 */ 1103 -4775, /* k2g1[10] = -0.14572785009373057 */ 1104 -4380, /* k2g1[11] = -0.13367265000706827 */ 1105 -4018, /* k2g1[12] = -0.1226147050712642 */ 1106 -3685, /* k2g1[13] = -0.11247151828678581 */ 1107 -3381, /* k2g1[14] = -0.10316741714122014 */ 1108 -3101, /* k2g1[15] = -0.0946329890599603 */ 1109 -2844, /* k2g1[16] = -0.08680456355870586 */ 1110 -2609, /* k2g1[17] = -0.07962373723441349 */ 1111 -2393, /* k2g1[18] = -0.07303693805092666 */ 1112 -2195, /* k2g1[19] = -0.06699502566866912 */ 1113 -2014, /* k2g1[20] = -0.06145292483669077 */ 1114 -1847, /* k2g1[21] = -0.056369289112013346 */ 1115 -1694, /* k2g1[22] = -0.05170619239747895 */ 1116 -1554, /* k2g1[23] = -0.04742884599684141 */ 1117 -1426, /* k2g1[24] = -0.043505339076210514 */ 1118 -1308, /* k2g1[25] = -0.03990640059558053 */ 1119 -1199, /* k2g1[26] = -0.03660518093435039 */ 1120 -1100, /* k2g1[27] = -0.03357705158166837 */ 1121 -1009, /* k2g1[28] = -0.030799421397205727 */ 1122 -926, /* k2g1[29] = -0.028251568071585884 */ 1123 -849 /* k2g1[30] = -0.025914483529091967 */ 1124 }; 1125 1126 static const EAS_I16 k2g2[] = 1127 { 1128 1957, /* k2g2[0] = 0.059711106626580836 */ 1129 1646, /* k2g2[1] = 0.05024063501786333 */ 1130 1385, /* k2g2[2] = 0.042272226217199664 */ 1131 1165, /* k2g2[3] = 0.03556764576567844 */ 1132 981, /* k2g2[4] = 0.029926444346999134 */ 1133 825, /* k2g2[5] = 0.025179964880280382 */ 1134 694, /* k2g2[6] = 0.02118630011706455 */ 1135 584, /* k2g2[7] = 0.01782604998793514 */ 1136 491, /* k2g2[8] = 0.014998751854573014 */ 1137 414, /* k2g2[9] = 0.012619876941179595 */ 1138 348, /* k2g2[10] = 0.010618303146468736 */ 1139 293, /* k2g2[11] = 0.008934188679954682 */ 1140 246, /* k2g2[12] = 0.007517182949855368 */ 1141 207, /* k2g2[13] = 0.006324921212866403 */ 1142 174, /* k2g2[14] = 0.005321757979794424 */ 1143 147, /* k2g2[15] = 0.004477701309210577 */ 1144 123, /* k2g2[16] = 0.00376751612730811 */ 1145 104, /* k2g2[17] = 0.0031699697655869644 */ 1146 87, /* k2g2[18] = 0.00266719715992703 */ 1147 74, /* k2g2[19] = 0.0022441667321724647 */ 1148 62, /* k2g2[20] = 0.0018882309854916855 */ 1149 52, /* k2g2[21] = 0.0015887483774966232 */ 1150 44, /* k2g2[22] = 0.0013367651661223448 */ 1151 37, /* k2g2[23] = 0.0011247477162958733 */ 1152 31, /* k2g2[24] = 0.0009463572640678758 */ 1153 26, /* k2g2[25] = 0.0007962604042473498 */ 1154 22, /* k2g2[26] = 0.0006699696356181593 */ 1155 18, /* k2g2[27] = 0.0005637091964589207 */ 1156 16, /* k2g2[28] = 0.00047430217920125243 */ 1157 13, /* k2g2[29] = 0.00039907554925166274 */ 1158 11 /* k2g2[30] = 0.00033578022828973666 */ 1159 }; 1160 1161 static const EAS_I16 n1g2[] = 1162 { 1163 3170, /* n1g2[0] = 0.0967319927350769 */ 1164 3036, /* n1g2[1] = 0.0926446051254155 */ 1165 2908, /* n1g2[2] = 0.08872992911818503 */ 1166 2785, /* n1g2[3] = 0.08498066682523227 */ 1167 2667, /* n1g2[4] = 0.08138982872895201 */ 1168 2554, /* n1g2[5] = 0.07795072065216213 */ 1169 2446, /* n1g2[6] = 0.0746569312785634 */ 1170 2343, /* n1g2[7] = 0.07150232020051943 */ 1171 2244, /* n1g2[8] = 0.06848100647187474 */ 1172 2149, /* n1g2[9] = 0.06558735764447099 */ 1173 2058, /* n1g2[10] = 0.06281597926792246 */ 1174 1971, /* n1g2[11] = 0.06016170483307614 */ 1175 1888, /* n1g2[12] = 0.05761958614040857 */ 1176 1808, /* n1g2[13] = 0.05518488407540374 */ 1177 1732, /* n1g2[14] = 0.052853059773715245 */ 1178 1659, /* n1g2[15] = 0.05061976615964251 */ 1179 1589, /* n1g2[16] = 0.04848083984214659 */ 1180 1521, /* n1g2[17] = 0.046432293353298 */ 1181 1457, /* n1g2[18] = 0.04447030771468711 */ 1182 1396, /* n1g2[19] = 0.04259122531793907 */ 1183 1337, /* n1g2[20] = 0.040791543106060944 */ 1184 1280, /* n1g2[21] = 0.03906790604290942 */ 1185 1226, /* n1g2[22] = 0.037417100858604564 */ 1186 1174, /* n1g2[23] = 0.035836050059229754 */ 1187 1125, /* n1g2[24] = 0.03432180618965023 */ 1188 1077, /* n1g2[25] = 0.03287154633875494 */ 1189 1032, /* n1g2[26] = 0.03148256687687814 */ 1190 988, /* n1g2[27] = 0.030152278415589925 */ 1191 946, /* n1g2[28] = 0.028878200980459685 */ 1192 906, /* n1g2[29] = 0.02765795938779331 */ 1193 868 /* n1g2[30] = 0.02648927881672521 */ 1194 }; 1195 1196 static const EAS_I16 n1g3[] = 1197 { 1198 -548, /* n1g3[0] = -0.016714088475899017 */ 1199 -481, /* n1g3[1] = -0.014683605122742116 */ 1200 -423, /* n1g3[2] = -0.012899791676436092 */ 1201 -371, /* n1g3[3] = -0.01133268185193299 */ 1202 -326, /* n1g3[4] = -0.00995594976868754 */ 1203 -287, /* n1g3[5] = -0.008746467702146129 */ 1204 -252, /* n1g3[6] = -0.00768391756106361 */ 1205 -221, /* n1g3[7] = -0.006750449563854721 */ 1206 -194, /* n1g3[8] = -0.005930382380083576 */ 1207 -171, /* n1g3[9] = -0.005209939699767622 */ 1208 -150, /* n1g3[10] = -0.004577018805123356 */ 1209 -132, /* n1g3[11] = -0.004020987256990177 */ 1210 -116, /* n1g3[12] = -0.003532504280467257 */ 1211 -102, /* n1g3[13] = -0.00310336384922047 */ 1212 -89, /* n1g3[14] = -0.002726356832432369 */ 1213 -78, /* n1g3[15] = -0.002395149888601605 */ 1214 -69, /* n1g3[16] = -0.0021041790717285314 */ 1215 -61, /* n1g3[17] = -0.0018485563625771063 */ 1216 -53, /* n1g3[18] = -0.001623987554831628 */ 1217 -47, /* n1g3[19] = -0.0014267001167177025 */ 1218 -41, /* n1g3[20] = -0.0012533798162347005 */ 1219 -36, /* n1g3[21] = -0.0011011150453668693 */ 1220 -32, /* n1g3[22] = -0.0009673479079754438 */ 1221 -28, /* n1g3[23] = -0.0008498312496971563 */ 1222 -24, /* n1g3[24] = -0.0007465909079943587 */ 1223 -21, /* n1g3[25] = -0.0006558925481952733 */ 1224 -19, /* n1g3[26] = -0.0005762125284029567 */ 1225 -17, /* n1g3[27] = -0.0005062123038325457 */ 1226 -15, /* n1g3[28] = -0.0004447159405951901 */ 1227 -13, /* n1g3[29] = -0.00039069036118270117 */ 1228 -11 /* n1g3[30] = -0.00034322798979677605 */ 1229 }; 1230 1231 /*---------------------------------------------------------------------------- 1232 * WT_SetFilterCoeffs() 1233 *---------------------------------------------------------------------------- 1234 * Purpose: 1235 * Update the Filter parameters 1236 * 1237 * Inputs: 1238 * pVoice - ptr to the voice whose filter we want to update 1239 * pEASData - pointer to overall EAS data structure 1240 * 1241 * Outputs: 1242 * 1243 * Side Effects: 1244 * - updates Filter values for the given voice 1245 *---------------------------------------------------------------------------- 1246 */ 1247 void WT_SetFilterCoeffs (S_WT_INT_FRAME *pIntFrame, EAS_I32 cutoff, EAS_I32 resonance) 1248 { 1249 EAS_I32 temp; 1250 1251 /* 1252 Convert the cutoff, which has had A5 subtracted, using the 2^x approx 1253 Note, this cutoff is related to theta cutoff by 1254 theta = k * 2^x 1255 We use 2^x and incorporate k in the power series coefs instead 1256 */ 1257 cutoff = EAS_Calculate2toX(cutoff); 1258 1259 /* calculate b2 coef */ 1260 temp = k2g1[resonance] + MULT_AUDIO_COEF(cutoff, k2g2[resonance]); 1261 temp = k2g0 + MULT_AUDIO_COEF(cutoff, temp); 1262 pIntFrame->frame.b2 = temp; 1263 1264 /* calculate b1 coef */ 1265 temp = MULT_AUDIO_COEF(cutoff, nk1g2); 1266 temp = nk1g0 + MULT_AUDIO_COEF(cutoff, temp); 1267 temp += MULT_AUDIO_COEF(temp, pIntFrame->frame.b2); 1268 pIntFrame->frame.b1 = temp >> 1; 1269 1270 /* calculate K coef */ 1271 temp = n1g2[resonance] + MULT_AUDIO_COEF(cutoff, n1g3[resonance]); 1272 temp = MULT_AUDIO_COEF(cutoff, temp); 1273 temp = MULT_AUDIO_COEF(cutoff, temp); 1274 pIntFrame->frame.k = temp; 1275 } 1276 #endif 1277 1278
