libcw/cwFlowPerf.cpp

#include "cwCommon.h"
#include "cwLog.h"
#include "cwCommonImpl.h"
#include "cwTest.h"
#include "cwMem.h"
#include "cwText.h"
#include "cwObject.h"
#include "cwVectOps.h"

#include "cwMtx.h"

#include "cwDspTypes.h" // srate_t, sample_t, coeff_t, ...

#include "cwTime.h"
#include "cwMidiDecls.h"
#include "cwMidi.h"
#include "cwMidiFile.h"

#include "cwFlowDecl.h"
#include "cwFlow.h"
#include "cwFlowValue.h"
#include "cwFlowTypes.h"
#include "cwFlowNet.h"
#include "cwFlowProc.h"


#include "cwDynRefTbl.h"    
#include "cwScoreParse.h"
#include "cwSfScore.h"
#include "cwSfTrack.h"
#include "cwPerfMeas.h"
#include "cwScoreFollowerPerf.h"
#include "cwScoreFollower.h"

#include "cwPianoScore.h"

#include "cwPresetSel.h"

#include "cwFlowPerf.h"

namespace cw
{

  namespace flow
  {
    //------------------------------------------------------------------------------------------------------------------
    //
    // Score Player
    //

    
    namespace score_player
    {
      enum {
        kScoreFNamePId,
        kDoneFlPId,
        kOutPId,
        kLocPId
      };

      typedef struct
      {        
        unsigned         sample_idx;
        unsigned         loc;
        unsigned         meas;
        unsigned         d1;   // inital d1 value before velocity mapping was applied
        midi::ch_msg_t*  midi; // index of associated msg in chMsgA
      } msg_t;

      typedef struct
      {

        unsigned        msgAllocN;
        unsigned        msgN;
        msg_t*          msgA;    // msgA[ msgN ]
        midi::ch_msg_t* chMsgA;  // chMsgA[ msgN ]

        recd_array_t* recd_array;
        unsigned      midi_fld_idx;
        unsigned      loc_fld_idx;
        unsigned      meas_fld_idx;

        unsigned sample_idx;
        unsigned msg_idx;
      } inst_t;

      rc_t _load_score( proc_t* proc, inst_t* p, const char* score_fname )
      {
        rc_t rc = kOkRC;

        perf_score::handle_t       perfScoreH;
        const perf_score::event_t* score_evt   = nullptr;
        char*                      fname       = nullptr;

        if( score_fname == nullptr || textLength(score_fname)==0  )
        {
          rc = cwLogError(kInvalidArgRC,"The score filename is blank.");
          goto errLabel;
        }

        if((fname = proc_expand_filename( proc, score_fname )) == nullptr )
        {
          rc = cwLogError(kOpFailRC,"The score filename (%s) is invalid.",score_fname);
          goto errLabel;
        }

        if((rc= perf_score::create( perfScoreH, fname )) != kOkRC )
        {
          rc = cwLogError(rc,"Score create failed on '%s'.",fname);
          goto errLabel;          
        }

        if((p->msgAllocN = perf_score::event_count(perfScoreH)) == 0 )
        {
          rc = cwLogWarning("The score '%s' is empty.",fname);
          goto errLabel;
        }

        if((score_evt = perf_score::base_event(perfScoreH)) == nullptr )
        {
          rc = cwLogError(kOpFailRC,"The score '%s' could not be accessed.",fname);
          goto errLabel;
        }

        p->msgA   = mem::allocZ<msg_t>(p->msgAllocN);
        p->chMsgA = mem::allocZ<midi::ch_msg_t>(p->msgAllocN);

        for(; p->msgN<p->msgAllocN && score_evt !=nullptr; score_evt=score_evt->link)
        {
          if( score_evt->status != 0 )
          {
            msg_t*          m  = p->msgA   + p->msgN;
            midi::ch_msg_t* mm = p->chMsgA + p->msgN;
            
            m->sample_idx = (unsigned)(proc->ctx->sample_rate * score_evt->sec);
            m->loc        = score_evt->loc;
            m->meas       = score_evt->meas;           
            m->midi       = mm;
            
            time::fracSecondsToSpec( mm->timeStamp, score_evt->sec );

            mm->devIdx = kInvalidIdx;
            mm->portIdx= kInvalidIdx;
            mm->uid    = score_evt->uid;
            mm->ch     = score_evt->status & 0x0f;
            mm->status = score_evt->status & 0xf0;
            mm->d0     = score_evt->d0;
            mm->d1     = score_evt->d1;
            m->d1      = score_evt->d1;
            
            p->msgN += 1;
          }

        }
        
        
      errLabel:
        if( rc != kOkRC )
          rc = cwLogError(rc,"Score load failed on '%s'.",cwStringNullGuard(fname));
        
        perf_score::destroy(perfScoreH);

        mem::release(fname);

        return rc;
      }


      rc_t _alloc_recd_array( proc_t* proc, const char* var_label, unsigned sfx_id, unsigned chIdx, const recd_type_t* base, recd_array_t*& recd_array_ref  )
      {
        rc_t        rc  = kOkRC;
        variable_t* var = nullptr;
        
        // find the record variable
        if((rc = var_find( proc, var_label, sfx_id, chIdx, var )) != kOkRC )
        {
          rc = cwLogError(rc,"The record variable '%s:%i' could was not found.",cwStringNullGuard(var_label),sfx_id);
          goto errLabel;
        }

        // verify that the variable has a record format
        if( !var_has_recd_format(var) )
        {
          rc = cwLogError(kInvalidArgRC,"The variable does not have a valid record format.");
          goto errLabel;
        }
        else
        {
          recd_fmt_t* recd_fmt = var->varDesc->fmt.recd_fmt;

          // create the recd_array
          if((rc = recd_array_create( recd_array_ref, recd_fmt->recd_type, base, recd_fmt->alloc_cnt )) != kOkRC )
          {
            goto errLabel;
          }
        }
        
      errLabel:
        if( rc != kOkRC )
          rc = cwLogError(rc,"Record array create failed on the variable '%s:%i ch:%i.",cwStringNullGuard(var_label),sfx_id,chIdx);
        
        return rc;
        
      }

      rc_t _create( proc_t* proc, inst_t* p )
      {
        rc_t    rc   = kOkRC;        
        const char* score_fname = nullptr;
        
        if((rc = var_register_and_get(proc,kAnyChIdx, kScoreFNamePId,    "fname",         kBaseSfxId, score_fname)) != kOkRC )
        {
          goto errLabel;
        }

        if((rc = var_register(proc,kAnyChIdx,
                              kLocPId,"loc", kBaseSfxId,
                              kDoneFlPId,"done_fl", kBaseSfxId )) != kOkRC )
        {
          goto errLabel;
        }

        // load the score
        if((rc = _load_score( proc, p, score_fname )) != kOkRC )
        {
          goto errLabel;
        }

        // allocate the output recd array
        if((rc = _alloc_recd_array( proc, "out", kBaseSfxId, kAnyChIdx, nullptr, p->recd_array  )) != kOkRC )
        {
          goto errLabel;
        }
        
        // create one output record buffer
        rc = var_register_and_set( proc, "out", kBaseSfxId, kOutPId, kAnyChIdx, p->recd_array->type, nullptr, 0  );

        p->midi_fld_idx = recd_type_field_index( p->recd_array->type, "midi");
        p->loc_fld_idx  = recd_type_field_index( p->recd_array->type, "loc");
        p->meas_fld_idx = recd_type_field_index( p->recd_array->type, "meas");


      errLabel:
        return rc;
      }

      rc_t _destroy( proc_t* proc, inst_t* p )
      {
        rc_t rc = kOkRC;

        recd_array_destroy(p->recd_array);
        mem::release(p->msgA);
        mem::release(p->chMsgA);
        return rc;
      }

      rc_t _value( proc_t* proc, inst_t* p, variable_t* var )
      {
        rc_t rc = kOkRC;
        return rc;
      }

      rc_t _exec( proc_t* proc, inst_t* p )
      {
        rc_t    rc      = kOkRC;
        rbuf_t* rbuf    = nullptr;
        bool    done_fl = false;

        p->sample_idx += proc->ctx->framesPerCycle;

        // get the output variable
        if((rc = var_get(proc,kOutPId,kAnyChIdx,rbuf)) != kOkRC )
          rc = cwLogError(kInvalidStateRC,"The MIDI file instance '%s' does not have a valid MIDI output buffer.",proc->label);
        else
        {
          rbuf->recdA = nullptr;
          rbuf->recdN = 0;
                    
          while( p->msg_idx < p->msgN && p->sample_idx >= p->msgA[p->msg_idx].sample_idx  )
          {
            recd_t* r = p->recd_array->recdA + rbuf->recdN;
            msg_t*  m = p->msgA + p->msg_idx;

            if( rbuf->recdA == nullptr )
              rbuf->recdA = r;

            if( rbuf->recdN >= p->recd_array->allocRecdN )
            {
              rc = cwLogError(kBufTooSmallRC,"The internal record buffer overflowed. (buf recd count:%i).",p->recd_array->allocRecdN);
              goto errLabel;
            }
            
            recd_set( rbuf->type, nullptr, r, p->midi_fld_idx, m->midi );
            recd_set( rbuf->type, nullptr, r, p->loc_fld_idx,  m->loc  );
            recd_set( rbuf->type, nullptr, r, p->meas_fld_idx, m->meas );            
              
            rbuf->recdN += 1;

            p->msg_idx += 1;

            done_fl = p->msg_idx == p->msgN;

          }

          
          if( done_fl )            
            var_set(proc, kDoneFlPId, kAnyChIdx, true );
          
        }
      errLabel:
        return rc;
      }

      rc_t _report( proc_t* proc, inst_t* p )
      { return kOkRC; }

      class_members_t members = {
        .create  = std_create<inst_t>,
        .destroy = std_destroy<inst_t>,
        .value   = std_value<inst_t>,
        .exec    = std_exec<inst_t>,
        .report  = std_report<inst_t>
      };
      
    } // score_player

    //------------------------------------------------------------------------------------------------------------------
    //
    // vel_table
    //
    namespace vel_table
    {
      enum {
        kVelTblFnamePId,
        kVelTblLabelPId,
        kInPId,
        kOutPId,
        kRecdBufNPId
      };
      
      typedef struct vel_tbl_str
      {
        unsigned* tblA;
        unsigned  tblN;
        char*     label;
        struct vel_tbl_str* link;
      } vel_tbl_t;
      
      typedef struct
      {
        vel_tbl_t*    velTblL;
        vel_tbl_t*    activeVelTbl;
        unsigned      i_midi_fld_idx;
        unsigned      o_midi_fld_idx;
        
        recd_array_t*   recd_array;  // output record array        
        midi::ch_msg_t* midiA;       // midiA[midiN] output MIDI msg array
        unsigned        midiN; 
      } inst_t;

      rc_t _load_vel_table_file( proc_t* proc, inst_t* p, const char* vel_tbl_fname )
      {
        rc_t            rc    = kOkRC;
        object_t*       cfg   = nullptr;
        const object_t* tblL  = nullptr;
        unsigned        tblN  = 0;
        char*           fname = nullptr;

        if( vel_tbl_fname == nullptr || textLength(vel_tbl_fname)==0  )
        {
          rc = cwLogError(kInvalidArgRC,"The velocity table filename is blank.");
          goto errLabel;
        }

        if((fname = proc_expand_filename( proc, vel_tbl_fname )) == nullptr )
        {
          rc = cwLogError(kOpFailRC,"The velocity table filename (%s) is invalid.",vel_tbl_fname);
          goto errLabel;
        }
        
        if((rc = objectFromFile(fname,cfg)) != kOkRC )
        {
          rc = cwLogError(rc,"Velocity table file parse failed.");
          goto errLabel;
        }

        if((rc = cfg->getv("tables",tblL)) != kOkRC )
        {
          rc = cwLogError(rc,"Velocity table file has no 'tables' field.");
          goto errLabel;
        }

        tblN = tblL->child_count();

        for(unsigned i=0; i<tblN; ++i)
        {
          const object_t* tbl        = tblL->child_ele(i);
          const object_t* velListCfg = nullptr;
          vel_tbl_t*      vt         = nullptr;          
          const char*     label      = nullptr;

          if((rc = tbl->getv("table",velListCfg,
                             "name",label)) != kOkRC )
          {
            rc = cwLogError(rc,"Velocity table at index %i failed.",i);
            goto errLabel;
          }

          vt         = mem::allocZ<vel_tbl_t>();
          vt->link   = p->velTblL;
          p->velTblL = vt;          
          vt->tblN   = velListCfg->child_count();
          vt->label  = mem::duplStr(label);

          // if the table is empty
          if( vt->tblN == 0 )
          {
            rc = cwLogError(rc,"The velocity table named '%s' appears to be blank.",cwStringNullGuard(label));
            continue;
          }

          vt->tblA = mem::allocZ<unsigned>(vt->tblN);

          for(unsigned j=0; j<vt->tblN; ++j)
          {
            const object_t* intCfg;
            
            if((intCfg = velListCfg->child_ele(j)) == nullptr )
            {
              rc = cwLogError(rc,"Access to the integer value at index %i failed on vel. table '%s'.",j,cwStringNullGuard(label));
              goto errLabel;
            }
            
            if((rc = intCfg->value(vt->tblA[j])) != kOkRC )
            {              
              rc = cwLogError(rc,"Parse failed on integer value at index %i in vel. table '%s'.",j,cwStringNullGuard(label));
              goto errLabel;
            }            
          }
          
        }
        

      errLabel:
        if( rc != kOkRC )
          rc = cwLogError(rc,"Score velocity table file load failed on '%s'.",cwStringNullGuard(vel_tbl_fname));          

        if( cfg != nullptr )
          cfg->free();
        
        mem::release(fname);

        return rc;
      }
      
      rc_t _activate_vel_table( proc_t* proc, inst_t* p, const char* vel_tbl_label )
      {
        for(vel_tbl_t* vt = p->velTblL; vt!=nullptr; vt=vt->link)
          if( textIsEqual(vt->label,vel_tbl_label))
          {
            p->activeVelTbl = vt;
            return kOkRC;
          }

        cwLogWarning("The requested velocity table '%s' was not found on the score instance '%s:%i'.",vel_tbl_label,proc->label, proc->label_sfx_id);
        
        return kOkRC;
      }

      rc_t _alloc_recd_array( proc_t* proc, const char* var_label, unsigned sfx_id, unsigned chIdx, const recd_type_t* base, recd_array_t*& recd_array_ref  )
      {
        rc_t        rc  = kOkRC;
        variable_t* var = nullptr;
        
        // find the record variable
        if((rc = var_find( proc, var_label, sfx_id, chIdx, var )) != kOkRC )
        {
          rc = cwLogError(rc,"The record variable '%s:%i' could was not found.",cwStringNullGuard(var_label),sfx_id);
          goto errLabel;
        }

        // verify that the variable has a record format
        if( !var_has_recd_format(var) )
        {
          rc = cwLogError(kInvalidArgRC,"The variable does not have a valid record format.");
          goto errLabel;
        }
        else
        {
          recd_fmt_t* recd_fmt = var->varDesc->fmt.recd_fmt;

          // create the recd_array
          if((rc = recd_array_create( recd_array_ref, recd_fmt->recd_type, base, recd_fmt->alloc_cnt )) != kOkRC )
          {
            goto errLabel;
          }
        }
        
      errLabel:
        if( rc != kOkRC )
          rc = cwLogError(rc,"Record array create failed on the variable '%s:%i ch:%i.",cwStringNullGuard(var_label),sfx_id,chIdx);
        
        return rc;
        
      }
              
      rc_t _create( proc_t* proc, inst_t* p )
      {
        rc_t    rc   = kOkRC;        

        const char* vel_tbl_fname = nullptr;
        const char* vel_tbl_label = nullptr;
        const rbuf_t* rbuf = nullptr;
        unsigned recdBufN = 128;
        
        if((rc = var_register_and_get(proc,kAnyChIdx,
                                      kVelTblFnamePId,   "vel_tbl_fname", kBaseSfxId, vel_tbl_fname,
                                      kVelTblLabelPId,   "vel_tbl_label", kBaseSfxId, vel_tbl_label,
                                      kRecdBufNPId,      "recdbufN",      kBaseSfxId, recdBufN,
                                      kInPId,            "in",            kBaseSfxId, rbuf)) != kOkRC )
        {
          goto errLabel;
        }

        // load p->velTblL from the vel table file
        if((rc = _load_vel_table_file( proc, p, vel_tbl_fname )) != kOkRC )
        {
          goto errLabel;
        }

        // activate the selected velocity table
        if((rc = _activate_vel_table( proc, p, vel_tbl_label )) != kOkRC )
        {
          goto errLabel;
        }

        // create the output recd_array using the 'in' record type as the base type
        if((rc = _alloc_recd_array( proc, "out", kBaseSfxId, kAnyChIdx, rbuf->type, p->recd_array  )) != kOkRC )
        {
          goto errLabel;
        }

        // get the record field index for the incoming record
        if((p->i_midi_fld_idx = recd_type_field_index( rbuf->type, "midi")) == kInvalidIdx )
        {
          rc = cwLogError(kInvalidArgRC,"The incoming record does not have a 'midi' field.");
          goto errLabel;                          
        }

        // get the record field index for the outgoing record
        if((p->o_midi_fld_idx = recd_type_field_index( p->recd_array->type, "midi")) == kInvalidIdx )
        {
          rc = cwLogError(kInvalidArgRC,"The outgoing record does not have a 'midi' field.");
          goto errLabel;                          
        }
        
        // create one output record buffer
        rc = var_register_and_set( proc, "out", kBaseSfxId, kOutPId, kAnyChIdx, p->recd_array->type, nullptr, 0  );

        p->midiN = p->recd_array->allocRecdN;
        p->midiA = mem::allocZ<midi::ch_msg_t>(p->midiN);
         
        
      errLabel:
        return rc;
      }

      rc_t _destroy( proc_t* proc, inst_t* p )
      {
        rc_t rc = kOkRC;

        vel_tbl_t* vt=p->velTblL;
        
        while( vt!=nullptr )
        {
          vel_tbl_t* vt0 = vt->link;
          mem::release(vt->label);
          mem::release(vt->tblA);
          mem::release(vt);
          vt = vt0;
        }

        mem::release(p->midiA);
        recd_array_destroy(p->recd_array);
        return rc;
      }

      rc_t _value( proc_t* proc, inst_t* p, variable_t* var )
      {
        rc_t rc = kOkRC;
        return rc;
      }

      rc_t _exec( proc_t* proc, inst_t* p )
      {
        rc_t rc      = kOkRC;

        const rbuf_t* i_rbuf = nullptr;
        rbuf_t*       o_rbuf = nullptr;

        if((rc = var_get(proc,kInPId,kAnyChIdx,i_rbuf)) != kOkRC )
          goto errLabel;

        if((rc = var_get(proc,kOutPId,kAnyChIdx,o_rbuf)) != kOkRC )
          goto errLabel;


        // for each incoming record
        for(unsigned i=0; i<i_rbuf->recdN; ++i)
        {
          const recd_t*         i_r = i_rbuf->recdA + i;          
          const midi::ch_msg_t* i_m = nullptr;

          // verify that there is space in the output array
          if( i >= p->midiN || i >= p->recd_array->allocRecdN )
          {
            rc = cwLogError(kBufTooSmallRC,"The velocity table MIDI processing buffers overflow (%i).",i);
            goto errLabel;
          }

          // Get pointers to the output records
          recd_t*         o_r = p->recd_array->recdA + i;
          midi::ch_msg_t* o_m = p->midiA + i;

          // get a pointer to the incoming MIDI record
          if((rc = recd_get(i_rbuf->type,i_r,p->i_midi_fld_idx,i_m)) != kOkRC )
          {
            rc = cwLogError(rc,"Record 'midi' field read failed.");
            goto errLabel;
          }

          // copy the incoming MIDI record to the output array
          *o_m = *i_m;

          // if this is a note on
          if( midi::isNoteOn(i_m->status,i_m->d1) )
          {
            // and the velocity is valid
            if( i_m->d1 >= p->activeVelTbl->tblN )
            {
              rc = cwLogError(kInvalidArgRC,"The pre-mapped velocity value %i is outside of the range (%i) of the velocity table '%s'.",i_m->d1,p->activeVelTbl->tblN,cwStringNullGuard(p->activeVelTbl->label));
              goto errLabel;
            }

            // map the velocity through the active table
            o_m->d1 = p->activeVelTbl->tblA[ i_m->d1 ];

            //printf("%i %i %s\n",i_m->d1,o_m->d1,p->activeVelTbl->label);
          }

          // update the MIDI pointer in the output record 
          recd_set(o_rbuf->type,i_r,o_r,p->o_midi_fld_idx, o_m );
        }

        //printf("RECDN:%i\n",i_rbuf->recdN);
        
        o_rbuf->recdA = p->recd_array->recdA;
        o_rbuf->recdN = i_rbuf->recdN;
        
        
        
      errLabel:
        if( rc != kOkRC )
          rc = cwLogError(rc,"Vel table exec failed.");
                          
        return rc;
      }

      rc_t _report( proc_t* proc, inst_t* p )
      { return kOkRC; }

      class_members_t members = {
        .create  = std_create<inst_t>,
        .destroy = std_destroy<inst_t>,
        .value   = std_value<inst_t>,
        .exec    = std_exec<inst_t>,
        .report  = std_report<inst_t>
      };
      
    }    

    //------------------------------------------------------------------------------------------------------------------
    //
    // preset_select
    //
    namespace preset_select
    {
      enum {
        kInPId,
        kInitCfgPId,
        kXfCntPId,
        kFNamePId,
        kLocPId,
        kOutIdxPId,
        kPresetLabelPId,
      };
      
      typedef struct
      {
        const char*          preset_proc_label; // proc containing preset label->value mapping
        unsigned             xf_cnt;        // count of transform processors 
        preset_sel::handle_t psH;           // location->preset map
        unsigned             loc_fld_idx;   // 
        unsigned             loc;           // Last received location
        unsigned             out_idx;       // Current transform processor index (0:xf_cnt)
        unsigned             presetN;       // Count of preset labels. Same as preset_count(psH).
        unsigned             preset_idx;    // Index (0:presetN) of last selected preset.
      } inst_t;

      unsigned _next_avail_xf_channel( inst_t* p )
      {
        p->out_idx += 1;
        if( p->out_idx == p->xf_cnt )
          p->out_idx = 0;
        return p->out_idx;
      }
      

      rc_t _create( proc_t* proc, inst_t* p )
      {
        rc_t        rc    = kOkRC;        
        const char* fname = nullptr;
        rbuf_t*     rbuf;
        const object_t* cfg = nullptr;
        char* exp_fname = nullptr;
        
        if((rc = var_register_and_get(proc,kAnyChIdx,
                                      kInitCfgPId,  "cfg",     kBaseSfxId, cfg,
                                      //kXfCntPId,    "xf_cnt",  kBaseSfxId, p->xf_cnt,
                                      kInPId,       "in",      kBaseSfxId, rbuf,
                                      kFNamePId,    "fname",   kBaseSfxId, fname,
                                      kLocPId,      "loc",     kBaseSfxId, p->loc)) != kOkRC )
        {
          goto errLabel;
        }

        if((rc = var_register_and_set(proc,kAnyChIdx,
                                      //kOutIdxPId,   "out_idx", kBaseSfxId, -1,
                                      kPresetLabelPId,"preset_label", kBaseSfxId, "")) != kOkRC )
        {
          goto errLabel;
        }
                                      

        if((exp_fname = proc_expand_filename(proc,fname)) == nullptr )
        {
          rc = cwLogError(kOpFailRC,"Preset filename expansion failed.");
          goto errLabel;
        }

        // create the cwPresetSel object
        if(cfg==nullptr || (rc = preset_sel::create(p->psH,cfg)) != kOkRC )
        {
          rc = cwLogError(kOpFailRC,"The preset select object could not be initialized.");
          goto errLabel;
        }

        // read in the loc->preset map file
        if((rc = preset_sel::read(p->psH,exp_fname)) != kOkRC )
        {
          rc = cwLogError(rc,"The preset_sel data file '%s' could not be read.",cwStringNullGuard(exp_fname));
          goto errLabel;
        }

        // The location is coming from a 'record', get the location field.
        if((p->loc_fld_idx  = recd_type_field_index( rbuf->type, "loc")) == kInvalidIdx )
        {
          rc = cwLogError(kInvalidArgRC,"The 'in' record does not have a 'loc' field.");
          goto errLabel;
        }

        p->presetN = preset_count(p->psH);
        
      errLabel:
        mem::release(exp_fname);
        return rc;
      }

      rc_t _destroy( proc_t* proc, inst_t* p )
      {
        rc_t rc = kOkRC;

        preset_sel::destroy(p->psH);

        return rc;
      }

      rc_t _value( proc_t* proc, inst_t* p, variable_t* var )
      {
        rc_t rc = kOkRC;
        return rc;
      }

      rc_t _exec( proc_t* proc, inst_t* p )
      {
        rc_t rc      = kOkRC;
        rbuf_t* in_rbuf = nullptr;
        unsigned loc = kInvalidIdx;

        /*
        if( p->preset_recd_array == nullptr )
        {
          // Fill p->preset_recd_array with values from the network presets
          if((rc = _alloc_preset_recd_array(proc,p)) != kOkRC )
            goto errLabel;
        }
        */
        
        if((rc = var_get(proc,kInPId,kAnyChIdx,in_rbuf)) != kOkRC)
          goto errLabel;
        
        // for each incoming record
        for(unsigned i=0; i<in_rbuf->recdN; ++i)
        {

          // get the 'loc' field
          if((rc = recd_get( in_rbuf->type, in_rbuf->recdA+i, p->loc_fld_idx, loc)) != kOkRC )
          {
            rc = cwLogError(rc,"The 'loc' field read failed.");
            goto errLabel;
          }
        }

        if( loc != kInvalidIdx )
        {        
          //rbuf_t*                   xf_rbuf    = nullptr;
          const preset_sel::frag_t* frag       = nullptr;
          unsigned                  preset_idx = kInvalidIdx;
          
          // lookup the fragment associated with the location
          if( preset_sel::track_loc( p->psH, loc, frag ) && frag != nullptr )
          {
            // select the preset(s) from the current frag
            //if((rc = var_get(proc, kXfArgsPId + p->out_idx, kAnyChIdx, xf_rbuf)) != kOkRC )
            //  goto errLabel;

            // get the preset index associated with the current frag
            if((preset_idx = fragment_play_preset_index(p->psH, frag )) == kInvalidIdx )
            {
              rc = cwLogError(kInvalidArgRC,"The current frag does not have valid preset associated with it.");
              goto errLabel;
            }

            // validate the preset index
            if( preset_idx >= p->presetN )
            {
              rc = cwLogError(kAssertFailRC,"The selected preset index %i is out of range.",preset_idx);
              goto errLabel;
            }
            

            if( preset_idx != p->preset_idx )
            {
            
              // get the next available xf output channel
              //p->out_idx = _next_avail_xf_channel(p);


              //if((rc = var_set(proc, kOutIdxPId, kAnyChIdx, p->out_idx)) != kOkRC )
              //  goto errLabel;

              if( preset_idx != kInvalidIdx )
                if((rc = var_set(proc, kPresetLabelPId, kAnyChIdx, preset_sel::preset_label(p->psH,preset_idx))) != kOkRC )
                  goto errLabel;
            }
          }
        
        }
        
      errLabel:
        return rc;
      }

      rc_t _report( proc_t* proc, inst_t* p )
      { return kOkRC; }

      class_members_t members = {
        .create  = std_create<inst_t>,
        .destroy = std_destroy<inst_t>,
        .value   = std_value<inst_t>,
        .exec    = std_exec<inst_t>,
        .report  = std_report<inst_t>
      };
      
    }    

    //------------------------------------------------------------------------------------------------------------------
    //
    // Score Follower
    //
    namespace score_follower
    {

      enum
      {
        kInPId,
        kDynTblFnamePId,
        kFnamePId,
        kScoreWndCntPId,
        kMidiWndCntPId,
        kPrintFlPId,
        kBacktrackFlPId,        
        kLocPId,
        kOutPId,
      };
      
      typedef struct
      {
        cw::dyn_ref_tbl::handle_t    dynRefH;
        cw::score_parse::handle_t    scParseH;
        cw::sfscore::handle_t scoreH;
        cw::score_follower::handle_t sfH;
        unsigned midi_field_idx;
        unsigned loc_field_idx;
        
      } inst_t;


      rc_t _create( proc_t* proc, inst_t* p )
      {
        rc_t                   rc                   = kOkRC;        
        rbuf_t*                in_rbuf              = nullptr;
        const char*            score_fname          = nullptr;
        const char*            dyn_tbl_fname        = nullptr;
        bool                   printParseWarningsFl = true;
        cw::score_follower::args_t args;

        if((rc = var_register_and_get(proc,kAnyChIdx,
                                      kInPId,         "in",            kBaseSfxId, in_rbuf,
                                      kFnamePId,      "fname",         kBaseSfxId, score_fname,
                                      kDynTblFnamePId,"dyn_ref_fname", kBaseSfxId, dyn_tbl_fname,
                                      kScoreWndCntPId,"score_wnd",     kBaseSfxId, args.scoreWndLocN,
                                      kMidiWndCntPId, "midi_wnd",      kBaseSfxId, args.midiWndLocN,
                                      kPrintFlPId,    "print_fl",      kBaseSfxId, args.trackPrintFl,
                                      kBacktrackFlPId,"back_track_fl", kBaseSfxId, args.trackResultsBacktrackFl )) != kOkRC )
        {
          goto errLabel;
        }

        // get the input record 'midi' field index
        if((p->midi_field_idx = recd_type_field_index( in_rbuf->type, "midi")) == kInvalidIdx )
        {
          rc = cwLogError(rc,"The input record type on '%s:%i' does not have a 'midi' field.",cwStringNullGuard(proc->label),proc->label_sfx_id);
          goto errLabel;          
        }

        // get the input record 'loc' field index
        if((p->loc_field_idx = recd_type_field_index( in_rbuf->type, "loc")) == kInvalidIdx )
        {
          rc = cwLogError(rc,"The input record type on '%s:%i' does not have a 'loc' field.",cwStringNullGuard(proc->label),proc->label_sfx_id);
          goto errLabel;          
        }

        // parse the dynamics reference array
        if((rc = dyn_ref_tbl::create(p->dynRefH,dyn_tbl_fname)) != kOkRC )
        {
          rc = cwLogError(rc,"The reference dynamics array parse failed.");
          goto errLabel;
        }
        
        // parse the score
        if((rc = create( p->scParseH, score_fname, proc->ctx->sample_rate, p->dynRefH, printParseWarningsFl )) != kOkRC )
        {
          rc = cwLogError(rc,"Score parse failed.");
          goto errLabel;
        }
        
        // create the SF score
        if((rc = create( p->scoreH, p->scParseH, printParseWarningsFl)) != kOkRC )
        {
          rc = cwLogError(rc,"SF Score create failed.");
          goto errLabel;
        }

        args.enableFl = true;
        args.scoreH   = p->scoreH;

        // create the score follower
        if((rc = create( p->sfH, args )) != kOkRC )
        {
          rc = cwLogError(rc,"Score follower create failed.");
          goto errLabel;          
        }

      errLabel:
        return rc;
      }

      rc_t _destroy( proc_t* proc, inst_t* p )
      {
        rc_t rc = kOkRC;

        destroy(p->sfH);
        destroy(p->scoreH);
        destroy(p->scParseH);
        destroy(p->dynRefH);

        return rc;
      }

      rc_t _value( proc_t* proc, inst_t* p, variable_t* var )
      {
        rc_t rc = kOkRC;
        return rc;
      }

      rc_t _exec( proc_t* proc, inst_t* p )
      {
        rc_t rc      = kOkRC;

        unsigned sample_idx = proc->ctx->cycleIndex * proc->ctx->framesPerCycle;
        double   sec        = ((double)sample_idx) / proc->ctx->sample_rate;
        rbuf_t*  rbuf       = nullptr;
        unsigned result_recd_idx = kInvalidIdx;

        if((rc = var_get(proc,kInPId,kAnyChIdx,rbuf)) != kOkRC)
          goto errLabel;

        // for each incoming record
        for(unsigned i=0; i<rbuf->recdN; ++i)
        {
          bool match_fl= false;
          midi::ch_msg_t* m = nullptr;

          if((rc = recd_get( rbuf->type, rbuf->recdA+i, p->midi_field_idx, m)) != kOkRC )
          {
            rc = cwLogError(rc,"The 'midi' field read failed.");
            goto errLabel;
          }
                    
          if((rc = exec( p->sfH, sec, sample_idx, m->uid, m->status, m->d0,m->d1, match_fl )) != kOkRC )
          {
            rc = cwLogError(rc,"Score follower exec failed.");
            goto errLabel;
          }

          if( match_fl )
            result_recd_idx = i;

        }

        if( result_recd_idx != kInvalidIdx )
        {
          unsigned        resultIdxN       = 0;
          const unsigned* resultIdxA       = current_result_index_array(p->sfH, resultIdxN );
          const sftrack::result_t* resultA = cw::score_follower::track_result(p->sfH);
          
          for(unsigned i=0; i<resultIdxN; ++i)
          {
            const sftrack::result_t* r = resultA + resultIdxA[i];                
            const sfscore::event_t* e = event(p->scoreH, r->scEvtIdx );

            // store the performance data in the score
            set_perf( p->scoreH, r->scEvtIdx, r->sec, r->pitch, r->vel, r->cost );
            
            if( i+1 == resultIdxN )
            {
              //recd_set( rbuf->type, rbuf->recdA + result_recd_idx, p->loc_field_idx, e->oLocId );
              var_set( proc, kLocPId, kAnyChIdx, e->oLocId );
            }
            
          }

          var_set( proc, kOutPId, kAnyChIdx, rbuf );
        }
        
        
      errLabel:
        return rc;
      }

      rc_t _report( proc_t* proc, inst_t* p )
      { return kOkRC; }

      class_members_t members = {
        .create  = std_create<inst_t>,
        .destroy = std_destroy<inst_t>,
        .value   = std_value<inst_t>,
        .exec    = std_exec<inst_t>,
        .report  = std_report<inst_t>
      };
      
    } // score_follower    

    
    
  } // flow
} //cw