/[svn]/libgig/trunk/src/gig.cpp
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Diff of /libgig/trunk/src/gig.cpp

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revision 21 by schoenebeck, Thu Dec 25 01:09:08 2003 UTC revision 36 by schoenebeck, Wed Mar 10 21:34:28 2004 UTC
# Line 73  namespace gig { Line 73  namespace gig {
73          }          }
74          FrameOffset = 0; // just for streaming compressed samples          FrameOffset = 0; // just for streaming compressed samples
75    
76          LoopStart /= FrameSize; // convert to sample points          LoopSize = LoopEnd - LoopStart;
         LoopEnd   /= FrameSize; // convert to sample points  
         LoopSize   = LoopEnd - LoopStart;  
77      }      }
78    
79      /// Scans compressed samples for mandatory informations (e.g. actual number of total sample points).      /// Scans compressed samples for mandatory informations (e.g. actual number of total sample points).
# Line 315  namespace gig { Line 313  namespace gig {
313      }      }
314    
315      /**      /**
316         * Reads \a SampleCount number of sample points from the position stored
317         * in \a pPlaybackState into the buffer pointed by \a pBuffer and moves
318         * the position within the sample respectively, this method honors the
319         * looping informations of the sample (if any). The sample wave stream
320         * will be decompressed on the fly if using a compressed sample. Use this
321         * method if you don't want to load the sample into RAM, thus for disk
322         * streaming. All this methods needs to know to proceed with streaming
323         * for the next time you call this method is stored in \a pPlaybackState.
324         * You have to allocate and initialize the playback_state_t structure by
325         * yourself before you use it to stream a sample:
326         *
327         * <i>
328         * gig::playback_state_t playbackstate;                           <br>
329         * playbackstate.position         = 0;                            <br>
330         * playbackstate.reverse          = false;                        <br>
331         * playbackstate.loop_cycles_left = pSample->LoopPlayCount;       <br>
332         * </i>
333         *
334         * You don't have to take care of things like if there is actually a loop
335         * defined or if the current read position is located within a loop area.
336         * The method already handles such cases by itself.
337         *
338         * @param pBuffer          destination buffer
339         * @param SampleCount      number of sample points to read
340         * @param pPlaybackState   will be used to store and reload the playback
341         *                         state for the next ReadAndLoop() call
342         * @returns                number of successfully read sample points
343         */
344        unsigned long Sample::ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState) {
345            unsigned long samplestoread = SampleCount, totalreadsamples = 0, readsamples, samplestoloopend;
346            uint8_t* pDst = (uint8_t*) pBuffer;
347    
348            SetPos(pPlaybackState->position); // recover position from the last time
349    
350            if (this->Loops && GetPos() <= this->LoopEnd) { // honor looping if there are loop points defined
351    
352                switch (this->LoopType) {
353    
354                    case loop_type_bidirectional: { //TODO: not tested yet!
355                        do {
356                            // if not endless loop check if max. number of loop cycles have been passed
357                            if (this->LoopPlayCount && !pPlaybackState->loop_cycles_left) break;
358    
359                            if (!pPlaybackState->reverse) { // forward playback
360                                do {
361                                    samplestoloopend  = this->LoopEnd - GetPos();
362                                    readsamples       = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoread, samplestoloopend));
363                                    samplestoread    -= readsamples;
364                                    totalreadsamples += readsamples;
365                                    if (readsamples == samplestoloopend) {
366                                        pPlaybackState->reverse = true;
367                                        break;
368                                    }
369                                } while (samplestoread && readsamples);
370                            }
371                            else { // backward playback
372    
373                                // as we can only read forward from disk, we have to
374                                // determine the end position within the loop first,
375                                // read forward from that 'end' and finally after
376                                // reading, swap all sample frames so it reflects
377                                // backward playback
378    
379                                unsigned long swapareastart       = totalreadsamples;
380                                unsigned long loopoffset          = GetPos() - this->LoopStart;
381                                unsigned long samplestoreadinloop = Min(samplestoread, loopoffset);
382                                unsigned long reverseplaybackend  = GetPos() - samplestoreadinloop;
383    
384                                SetPos(reverseplaybackend);
385    
386                                // read samples for backward playback
387                                do {
388                                    readsamples          = Read(&pDst[totalreadsamples * this->FrameSize], samplestoreadinloop);
389                                    samplestoreadinloop -= readsamples;
390                                    samplestoread       -= readsamples;
391                                    totalreadsamples    += readsamples;
392                                } while (samplestoreadinloop && readsamples);
393    
394                                SetPos(reverseplaybackend); // pretend we really read backwards
395    
396                                if (reverseplaybackend == this->LoopStart) {
397                                    pPlaybackState->loop_cycles_left--;
398                                    pPlaybackState->reverse = false;
399                                }
400    
401                                // reverse the sample frames for backward playback
402                                SwapMemoryArea(&pDst[swapareastart * this->FrameSize], (totalreadsamples - swapareastart) * this->FrameSize, this->FrameSize);
403                            }
404                        } while (samplestoread && readsamples);
405                        break;
406                    }
407    
408                    case loop_type_backward: { // TODO: not tested yet!
409                        // forward playback (not entered the loop yet)
410                        if (!pPlaybackState->reverse) do {
411                            samplestoloopend  = this->LoopEnd - GetPos();
412                            readsamples       = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoread, samplestoloopend));
413                            samplestoread    -= readsamples;
414                            totalreadsamples += readsamples;
415                            if (readsamples == samplestoloopend) {
416                                pPlaybackState->reverse = true;
417                                break;
418                            }
419                        } while (samplestoread && readsamples);
420    
421                        if (!samplestoread) break;
422    
423                        // as we can only read forward from disk, we have to
424                        // determine the end position within the loop first,
425                        // read forward from that 'end' and finally after
426                        // reading, swap all sample frames so it reflects
427                        // backward playback
428    
429                        unsigned long swapareastart       = totalreadsamples;
430                        unsigned long loopoffset          = GetPos() - this->LoopStart;
431                        unsigned long samplestoreadinloop = (this->LoopPlayCount) ? Min(samplestoread, pPlaybackState->loop_cycles_left * LoopSize - loopoffset)
432                                                                                  : samplestoread;
433                        unsigned long reverseplaybackend  = this->LoopStart + Abs((loopoffset - samplestoreadinloop) % this->LoopSize);
434    
435                        SetPos(reverseplaybackend);
436    
437                        // read samples for backward playback
438                        do {
439                            // if not endless loop check if max. number of loop cycles have been passed
440                            if (this->LoopPlayCount && !pPlaybackState->loop_cycles_left) break;
441                            samplestoloopend     = this->LoopEnd - GetPos();
442                            readsamples          = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoreadinloop, samplestoloopend));
443                            samplestoreadinloop -= readsamples;
444                            samplestoread       -= readsamples;
445                            totalreadsamples    += readsamples;
446                            if (readsamples == samplestoloopend) {
447                                pPlaybackState->loop_cycles_left--;
448                                SetPos(this->LoopStart);
449                            }
450                        } while (samplestoreadinloop && readsamples);
451    
452                        SetPos(reverseplaybackend); // pretend we really read backwards
453    
454                        // reverse the sample frames for backward playback
455                        SwapMemoryArea(&pDst[swapareastart * this->FrameSize], (totalreadsamples - swapareastart) * this->FrameSize, this->FrameSize);
456                        break;
457                    }
458    
459                    default: case loop_type_normal: {
460                        do {
461                            // if not endless loop check if max. number of loop cycles have been passed
462                            if (this->LoopPlayCount && !pPlaybackState->loop_cycles_left) break;
463                            samplestoloopend  = this->LoopEnd - GetPos();
464                            readsamples       = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoread, samplestoloopend));
465                            samplestoread    -= readsamples;
466                            totalreadsamples += readsamples;
467                            if (readsamples == samplestoloopend) {
468                                pPlaybackState->loop_cycles_left--;
469                                SetPos(this->LoopStart);
470                            }
471                        } while (samplestoread && readsamples);
472                        break;
473                    }
474                }
475            }
476    
477            // read on without looping
478            if (samplestoread) do {
479                readsamples = Read(&pDst[totalreadsamples * this->FrameSize], samplestoread);
480                samplestoread    -= readsamples;
481                totalreadsamples += readsamples;
482            } while (readsamples && samplestoread);
483    
484            // store current position
485            pPlaybackState->position = GetPos();
486    
487            return totalreadsamples;
488        }
489    
490        /**
491       * Reads \a SampleCount number of sample points from the current       * Reads \a SampleCount number of sample points from the current
492       * position into the buffer pointed by \a pBuffer and increments the       * position into the buffer pointed by \a pBuffer and increments the
493       * position within the sample. The sample wave stream will be       * position within the sample. The sample wave stream will be
# Line 523  namespace gig { Line 696  namespace gig {
696          _3ewa->ReadInt16(); // unknown          _3ewa->ReadInt16(); // unknown
697          EG1Sustain          = _3ewa->ReadUint16();          EG1Sustain          = _3ewa->ReadUint16();
698          EG1Release          = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());          EG1Release          = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
699          EG1Controller       = static_cast<eg1_ctrl_t>(_3ewa->ReadUint8());          EG1Controller       = DecodeLeverageController(static_cast<_lev_ctrl_t>(_3ewa->ReadUint8()));
700          uint8_t eg1ctrloptions        = _3ewa->ReadUint8();          uint8_t eg1ctrloptions        = _3ewa->ReadUint8();
701          EG1ControllerInvert           = eg1ctrloptions & 0x01;          EG1ControllerInvert           = eg1ctrloptions & 0x01;
702          EG1ControllerAttackInfluence  = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg1ctrloptions);          EG1ControllerAttackInfluence  = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg1ctrloptions);
703          EG1ControllerDecayInfluence   = GIG_EG_CTR_DECAY_INFLUENCE_EXTRACT(eg1ctrloptions);          EG1ControllerDecayInfluence   = GIG_EG_CTR_DECAY_INFLUENCE_EXTRACT(eg1ctrloptions);
704          EG1ControllerReleaseInfluence = GIG_EG_CTR_RELEASE_INFLUENCE_EXTRACT(eg1ctrloptions);          EG1ControllerReleaseInfluence = GIG_EG_CTR_RELEASE_INFLUENCE_EXTRACT(eg1ctrloptions);
705          EG2Controller       = static_cast<eg2_ctrl_t>(_3ewa->ReadUint8());          EG2Controller       = DecodeLeverageController(static_cast<_lev_ctrl_t>(_3ewa->ReadUint8()));
706          uint8_t eg2ctrloptions        = _3ewa->ReadUint8();          uint8_t eg2ctrloptions        = _3ewa->ReadUint8();
707          EG2ControllerInvert           = eg2ctrloptions & 0x01;          EG2ControllerInvert           = eg2ctrloptions & 0x01;
708          EG2ControllerAttackInfluence  = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg2ctrloptions);          EG2ControllerAttackInfluence  = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg2ctrloptions);
# Line 591  namespace gig { Line 764  namespace gig {
764              ReleaseVelocityResponseDepth = 0;              ReleaseVelocityResponseDepth = 0;
765          }          }
766          VelocityResponseCurveScaling = _3ewa->ReadUint8();          VelocityResponseCurveScaling = _3ewa->ReadUint8();
767          AttenuationControlTreshold   = _3ewa->ReadInt8();          AttenuationControllerThreshold = _3ewa->ReadInt8();
768          _3ewa->ReadInt32(); // unknown          _3ewa->ReadInt32(); // unknown
769          SampleStartOffset = (uint16_t) _3ewa->ReadInt16();          SampleStartOffset = (uint16_t) _3ewa->ReadInt16();
770          _3ewa->ReadInt16(); // unknown          _3ewa->ReadInt16(); // unknown
# Line 607  namespace gig { Line 780  namespace gig {
780          uint8_t lfo3ctrl = _3ewa->ReadUint8();          uint8_t lfo3ctrl = _3ewa->ReadUint8();
781          LFO3Controller           = static_cast<lfo3_ctrl_t>(lfo3ctrl & 0x07); // lower 3 bits          LFO3Controller           = static_cast<lfo3_ctrl_t>(lfo3ctrl & 0x07); // lower 3 bits
782          LFO3Sync                 = lfo3ctrl & 0x20; // bit 5          LFO3Sync                 = lfo3ctrl & 0x20; // bit 5
783          InvertAttenuationControl = lfo3ctrl & 0x80; // bit 7          InvertAttenuationController = lfo3ctrl & 0x80; // bit 7
784          if (VCFType == vcf_type_lowpass) {          if (VCFType == vcf_type_lowpass) {
785              if (lfo3ctrl & 0x40) // bit 6              if (lfo3ctrl & 0x40) // bit 6
786                  VCFType = vcf_type_lowpassturbo;                  VCFType = vcf_type_lowpassturbo;
787          }          }
788          AttenuationControl = static_cast<attenuation_ctrl_t>(_3ewa->ReadUint8());          AttenuationController  = DecodeLeverageController(static_cast<_lev_ctrl_t>(_3ewa->ReadUint8()));
789          uint8_t lfo2ctrl       = _3ewa->ReadUint8();          uint8_t lfo2ctrl       = _3ewa->ReadUint8();
790          LFO2Controller         = static_cast<lfo2_ctrl_t>(lfo2ctrl & 0x07); // lower 3 bits          LFO2Controller         = static_cast<lfo2_ctrl_t>(lfo2ctrl & 0x07); // lower 3 bits
791          LFO2FlipPhase          = lfo2ctrl & 0x80; // bit 7          LFO2FlipPhase          = lfo2ctrl & 0x80; // bit 7
# Line 696  namespace gig { Line 869  namespace gig {
869              (*pVelocityTables)[tableKey] = pVelocityAttenuationTable; // put the new table into the tables map              (*pVelocityTables)[tableKey] = pVelocityAttenuationTable; // put the new table into the tables map
870          }          }
871      }      }
872        
873        leverage_ctrl_t DimensionRegion::DecodeLeverageController(_lev_ctrl_t EncodedController) {
874            leverage_ctrl_t decodedcontroller;
875            switch (EncodedController) {
876                // special controller
877                case _lev_ctrl_none:
878                    decodedcontroller.type = leverage_ctrl_t::type_none;
879                    decodedcontroller.controller_number = 0;
880                    break;
881                case _lev_ctrl_velocity:
882                    decodedcontroller.type = leverage_ctrl_t::type_velocity;
883                    decodedcontroller.controller_number = 0;
884                    break;
885                case _lev_ctrl_channelaftertouch:
886                    decodedcontroller.type = leverage_ctrl_t::type_channelaftertouch;
887                    decodedcontroller.controller_number = 0;
888                    break;
889                
890                // ordinary MIDI control change controller
891                case _lev_ctrl_modwheel:
892                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
893                    decodedcontroller.controller_number = 1;
894                    break;
895                case _lev_ctrl_breath:
896                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
897                    decodedcontroller.controller_number = 2;
898                    break;
899                case _lev_ctrl_foot:
900                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
901                    decodedcontroller.controller_number = 4;
902                    break;
903                case _lev_ctrl_effect1:
904                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
905                    decodedcontroller.controller_number = 12;
906                    break;
907                case _lev_ctrl_effect2:
908                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
909                    decodedcontroller.controller_number = 13;
910                    break;
911                case _lev_ctrl_genpurpose1:
912                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
913                    decodedcontroller.controller_number = 16;
914                    break;
915                case _lev_ctrl_genpurpose2:
916                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
917                    decodedcontroller.controller_number = 17;
918                    break;
919                case _lev_ctrl_genpurpose3:
920                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
921                    decodedcontroller.controller_number = 18;
922                    break;
923                case _lev_ctrl_genpurpose4:
924                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
925                    decodedcontroller.controller_number = 19;
926                    break;
927                case _lev_ctrl_portamentotime:
928                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
929                    decodedcontroller.controller_number = 5;
930                    break;
931                case _lev_ctrl_sustainpedal:
932                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
933                    decodedcontroller.controller_number = 64;
934                    break;
935                case _lev_ctrl_portamento:
936                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
937                    decodedcontroller.controller_number = 65;
938                    break;
939                case _lev_ctrl_sostenutopedal:
940                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
941                    decodedcontroller.controller_number = 66;
942                    break;
943                case _lev_ctrl_softpedal:
944                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
945                    decodedcontroller.controller_number = 67;
946                    break;
947                case _lev_ctrl_genpurpose5:
948                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
949                    decodedcontroller.controller_number = 80;
950                    break;
951                case _lev_ctrl_genpurpose6:
952                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
953                    decodedcontroller.controller_number = 81;
954                    break;
955                case _lev_ctrl_genpurpose7:
956                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
957                    decodedcontroller.controller_number = 82;
958                    break;
959                case _lev_ctrl_genpurpose8:
960                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
961                    decodedcontroller.controller_number = 83;
962                    break;
963                case _lev_ctrl_effect1depth:
964                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
965                    decodedcontroller.controller_number = 91;
966                    break;
967                case _lev_ctrl_effect2depth:
968                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
969                    decodedcontroller.controller_number = 92;
970                    break;
971                case _lev_ctrl_effect3depth:
972                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
973                    decodedcontroller.controller_number = 93;
974                    break;
975                case _lev_ctrl_effect4depth:
976                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
977                    decodedcontroller.controller_number = 94;
978                    break;
979                case _lev_ctrl_effect5depth:
980                    decodedcontroller.type = leverage_ctrl_t::type_controlchange;
981                    decodedcontroller.controller_number = 95;
982                    break;
983                
984                // unknown controller type
985                default:
986                    throw gig::Exception("Unknown leverage controller type.");
987            }
988            return decodedcontroller;
989        }
990    
991      DimensionRegion::~DimensionRegion() {      DimensionRegion::~DimensionRegion() {
992          Instances--;          Instances--;
# Line 720  namespace gig { Line 1011  namespace gig {
1011       * triggered to get the volume with which the sample should be played       * triggered to get the volume with which the sample should be played
1012       * back.       * back.
1013       *       *
1014       * @param    MIDI velocity value of the triggered key (between 0 and 127)       * @param MIDIKeyVelocity  MIDI velocity value of the triggered key (between 0 and 127)
1015       * @returns  amplitude factor (between 0.0 and 1.0)       * @returns                amplitude factor (between 0.0 and 1.0)
1016       */       */
1017      double DimensionRegion::GetVelocityAttenuation(uint8_t MIDIKeyVelocity) {      double DimensionRegion::GetVelocityAttenuation(uint8_t MIDIKeyVelocity) {
1018          return pVelocityAttenuationTable[MIDIKeyVelocity];          return pVelocityAttenuationTable[MIDIKeyVelocity];
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