text: #include "stdio.h"
  #ifndef mips
  #include "stdlib.h"
  #endif
  #include "xlisp.h"
  #include "sound.h"
  
  #include "falloc.h"
  #include "cext.h"
  #include "stkpitshift.h"
  
  void stkpitshift_free(snd_susp_type a_susp);
  
  
  typedef struct stkpitshift_susp_struct {
      snd_susp_node susp;
      int64_t terminate_cnt;
      boolean logically_stopped;
      sound_type s1;
      int s1_cnt;
      sample_block_values_type s1_ptr;
  
      struct stkEffect *mych;
  } stkpitshift_susp_node, *stkpitshift_susp_type;
  
  
  #include "stkint.h"
  
  
  void stkpitshift_s_fetch(snd_susp_type a_susp, snd_list_type snd_list)
  {
      stkpitshift_susp_type susp = (stkpitshift_susp_type) a_susp;
      int cnt = 0; /* how many samples computed */
      int togo;
      int n;
      sample_block_type out;
      register sample_block_values_type out_ptr;
  
      register sample_block_values_type out_ptr_reg;
  
      register struct stkEffect * mych_reg;
      register sample_type s1_scale_reg = susp->s1->scale;
      register sample_block_values_type s1_ptr_reg;
      falloc_sample_block(out, "stkpitshift_s_fetch");
      out_ptr = out->samples;
      snd_list->block = out;
  
      while (cnt < max_sample_block_len) { /* outer loop */
          /* first compute how many samples to generate in inner loop: */
          /* don't overflow the output sample block: */
          togo = max_sample_block_len - cnt;
  
          /* don't run past the s1 input sample block: */
          susp_check_term_log_samples(s1, s1_ptr, s1_cnt);
          togo = min(togo, susp->s1_cnt);
  
          /* don't run past terminate time */
          if (susp->terminate_cnt != UNKNOWN &&
              susp->terminate_cnt <= susp->susp.current + cnt + togo) {
              togo = (int) (susp->terminate_cnt - (susp->susp.current + cnt));
              if (togo < 0) togo = 0;  /* avoids rounding errros */
              if (togo == 0) break;
          }
  
  
          /* don't run past logical stop time */
          if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) {
              int64_t to_stop = susp->susp.log_stop_cnt - (susp->susp.current + cnt);
              /* break if to_stop == 0 (we're at the logical stop)
               * AND cnt > 0 (we're not at the beginning of the
               * output block).
               */
              if (to_stop < 0) to_stop = 0; /* avoids rounding errors */
              if (to_stop < togo) {
                  if (to_stop == 0) {
                      if (cnt) {
                          togo = 0;
                          break;
                      } else /* keep togo as is: since cnt == 0, we
                              * can set the logical stop flag on this
                              * output block
                              */
                          susp->logically_stopped = true;
                  } else /* limit togo so we can start a new
                          * block at the LST
                          */
                      togo = (int) to_stop;
              }
          }
  
          n = togo;
          mych_reg = susp->mych;
          s1_ptr_reg = susp->s1_ptr;
          out_ptr_reg = out_ptr;
          if (n) do { /* the inner sample computation loop */
              *out_ptr_reg++ = (sample_type) (stkEffectTick(mych_reg, (s1_scale_reg * *s1_ptr_reg++)));
          } while (--n); /* inner loop */
  
          susp->mych = mych_reg;
          /* using s1_ptr_reg is a bad idea on RS/6000: */
          susp->s1_ptr += togo;
          out_ptr += togo;
          susp_took(s1_cnt, togo);
          cnt += togo;
      } /* outer loop */
  
      /* test for termination */
      if (togo == 0 && cnt == 0) {
          snd_list_terminate(snd_list);
      } else {
          snd_list->block_len = cnt;
          susp->susp.current += cnt;
      }
      /* test for logical stop */
      if (susp->logically_stopped) {
          snd_list->logically_stopped = true;
      } else if (susp->susp.log_stop_cnt == susp->susp.current) {
          susp->logically_stopped = true;
      }
  } /* stkpitshift_s_fetch */
  
  
  void stkpitshift_toss_fetch(snd_susp_type a_susp, snd_list_type snd_list)
  {
      stkpitshift_susp_type susp = (stkpitshift_susp_type) a_susp;
      time_type final_time = susp->susp.t0;
      int n;
  
      /* fetch samples from s1 up to final_time for this block of zeros */
      while ((ROUNDBIG((final_time - susp->s1->t0) * susp->s1->sr)) >=
             susp->s1->current)
          susp_get_samples(s1, s1_ptr, s1_cnt);
      /* convert to normal processing when we hit final_count */
      /* we want each signal positioned at final_time */
      n = (int) ROUNDBIG((final_time - susp->s1->t0) * susp->s1->sr -
           (susp->s1->current - susp->s1_cnt));
      susp->s1_ptr += n;
      susp_took(s1_cnt, n);
      susp->susp.fetch = susp->susp.keep_fetch;
      (*(susp->susp.fetch))(a_susp, snd_list);
  }
  
  
  void stkpitshift_mark(snd_susp_type a_susp)
  {
      stkpitshift_susp_type susp = (stkpitshift_susp_type) a_susp;
      sound_xlmark(susp->s1);
  }
  
  
  void stkpitshift_free(snd_susp_type a_susp)
  {
      stkpitshift_susp_type susp = (stkpitshift_susp_type) a_susp;
      deleteStkEffect(susp->mych);
      sound_unref(susp->s1);
      ffree_generic(susp, sizeof(stkpitshift_susp_node), "stkpitshift_free");
  }
  
  
  void stkpitshift_print_tree(snd_susp_type a_susp, int n)
  {
      stkpitshift_susp_type susp = (stkpitshift_susp_type) a_susp;
      indent(n);
      stdputstr("s1:");
      sound_print_tree_1(susp->s1, n);
  }
  
  
  sound_type snd_make_stkpitshift(sound_type s1, double shift, double mix)
  {
      register stkpitshift_susp_type susp;
      rate_type sr = s1->sr;
      time_type t0 = s1->t0;
      sample_type scale_factor = 1.0F;
      time_type t0_min = t0;
      falloc_generic(susp, stkpitshift_susp_node, "snd_make_stkpitshift");
      susp->mych = initStkPitShift(shift, ROUND32(sr));
  stkEffectSetMix(susp->mych, mix);
      susp->susp.fetch = stkpitshift_s_fetch;
      susp->terminate_cnt = UNKNOWN;
      /* handle unequal start times, if any */
      if (t0 < s1->t0) sound_prepend_zeros(s1, t0);
      /* minimum start time over all inputs: */
      t0_min = min(s1->t0, t0);
      /* how many samples to toss before t0: */
      susp->susp.toss_cnt = (long) ((t0 - t0_min) * sr + 0.5);
      if (susp->susp.toss_cnt > 0) {
          susp->susp.keep_fetch = susp->susp.fetch;
          susp->susp.fetch = stkpitshift_toss_fetch;
      }
  
      /* initialize susp state */
      susp->susp.free = stkpitshift_free;
      susp->susp.sr = sr;
      susp->susp.t0 = t0;
      susp->susp.mark = stkpitshift_mark;
      susp->susp.print_tree = stkpitshift_print_tree;
      susp->susp.name = "stkpitshift";
      susp->logically_stopped = false;
      susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s1);
      susp->susp.current = 0;
      susp->s1 = s1;
      susp->s1_cnt = 0;
      return sound_create((snd_susp_type)susp, t0, sr, scale_factor);
  }
  
  
  sound_type snd_stkpitshift(sound_type s1, double shift, double mix)
  {
      sound_type s1_copy = sound_copy(s1);
      return snd_make_stkpitshift(s1_copy, shift, mix);
  }
  