aresonvv.c

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	     */
	    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 = to_stop;
	    }
	}

	n = togo;
	c3co_reg = susp->c3co;
	c3p1_reg = susp->c3p1;
	c3t4_reg = susp->c3t4;
	omc3_reg = susp->omc3;
	coshz_reg = susp->coshz;
	c2_reg = susp->c2;
	c1_reg = susp->c1;
	recompute_reg = susp->recompute;
	normalization_reg = susp->normalization;
	y1_reg = susp->y1;
	y2_reg = susp->y2;
	bw_pHaSe_ReG = susp->bw_pHaSe;
	bw_x1_sample_reg = susp->bw_x1_sample;
	s1_ptr_reg = susp->s1_ptr;
	out_ptr_reg = out_ptr;
	if (n) do { /* the inner sample computation loop */
            register double y0, current;	    if (bw_pHaSe_ReG >= 1.0) {
/* fixup-depends bw */
		/* pick up next sample as bw_x1_sample: */
		susp->bw_ptr++;
		susp_took(bw_cnt, 1);
		bw_pHaSe_ReG -= 1.0;
		susp_check_term_samples_break(bw, bw_ptr, bw_cnt, bw_x1_sample_reg);
		bw_x1_sample_reg = susp_current_sample(bw, bw_ptr);
		c3co_reg = susp->c3co = exp(bw_x1_sample_reg);
		c3p1_reg = susp->c3p1 = c3co_reg + 1.0;
		c3t4_reg = susp->c3t4 = c3co_reg * 4.0;
		omc3_reg = susp->omc3 = 1.0 - c3co_reg;
		recompute_reg = susp->recompute = true;
	    }
	    if (recompute_reg) {
	        recompute_reg = false;
	        c2_reg = c3t4_reg * coshz_reg / c3p1_reg;
	        c1_reg = (normalization_reg == 0 ? 0.0 :
	              (normalization_reg == 1 ? 1.0 - omc3_reg * sqrt(1.0 - c2_reg * c2_reg / c3t4_reg) :
	               1.0 - sqrt(c3p1_reg * c3p1_reg - c2_reg * c2_reg) * omc3_reg / c3p1_reg));
	    }
current = *s1_ptr_reg++;
            y0 = c1_reg * current + c2_reg * y1_reg - c3co_reg * y2_reg;
            *out_ptr_reg++ = (sample_type) y0;
            y2_reg = y1_reg; y1_reg = y0 - current;
	    bw_pHaSe_ReG += bw_pHaSe_iNcR_rEg;
	} while (--n); /* inner loop */

	togo -= n;
	susp->recompute = recompute_reg;
	susp->y1 = y1_reg;
	susp->y2 = y2_reg;
	susp->bw_pHaSe = bw_pHaSe_ReG;
	susp->bw_x1_sample = bw_x1_sample_reg;
	/* using s1_ptr_reg is a bad idea on RS/6000: */
	susp->s1_ptr += togo;
	out_ptr += togo;
	susp_took(s1_cnt, togo);
	susp->hz1_pHaSe += togo * susp->hz1_pHaSe_iNcR;
	susp->hz1_n -= 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;
    }
} /* aresonvv_nri_fetch */


void aresonvv_nrr_fetch(register aresonvv_susp_type susp, snd_list_type snd_list)
{
    int cnt = 0; /* how many samples computed */
    sample_type hz1_val;
    sample_type bw_val;
    int togo;
    int n;
    sample_block_type out;
    register sample_block_values_type out_ptr;

    register sample_block_values_type out_ptr_reg;

    register double c3co_reg;
    register double c2_reg;
    register double c1_reg;
    register boolean recompute_reg;
    register double y1_reg;
    register double y2_reg;
    register sample_block_values_type s1_ptr_reg;
    falloc_sample_block(out, "aresonvv_nrr_fetch");
    out_ptr = out->samples;
    snd_list->block = out;

    /* make sure sounds are primed with first values */
    if (!susp->started) {
	susp->started = true;
	susp->hz1_pHaSe = 1.0;
	susp->bw_pHaSe = 1.0;
    }

    susp_check_term_samples(hz1, hz1_ptr, hz1_cnt);

    susp_check_term_samples(bw, bw_ptr, bw_cnt);

    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);

	/* grab next hz1_x1_sample when phase goes past 1.0; */
	/* use hz1_n (computed below) to avoid roundoff errors: */
	if (susp->hz1_n <= 0) {
	    susp_check_term_samples(hz1, hz1_ptr, hz1_cnt);
	    susp->hz1_x1_sample = susp_fetch_sample(hz1, hz1_ptr, hz1_cnt);
	    susp->hz1_pHaSe -= 1.0;
	    /* hz1_n gets number of samples before phase exceeds 1.0: */
	    susp->hz1_n = (long) ((1.0 - susp->hz1_pHaSe) *
					susp->output_per_hz1);
	    susp->coshz = cos(susp->hz1_x1_sample);
	    susp->recompute = true;
	}
	togo = MIN(togo, susp->hz1_n);
	hz1_val = susp->hz1_x1_sample;
	/* grab next bw_x1_sample when phase goes past 1.0; */
	/* use bw_n (computed below) to avoid roundoff errors: */
	if (susp->bw_n <= 0) {
	    susp_check_term_samples(bw, bw_ptr, bw_cnt);
	    susp->bw_x1_sample = susp_fetch_sample(bw, bw_ptr, bw_cnt);
	    susp->bw_pHaSe -= 1.0;
	    /* bw_n gets number of samples before phase exceeds 1.0: */
	    susp->bw_n = (long) ((1.0 - susp->bw_pHaSe) *
					susp->output_per_bw);
	    susp->c3co = exp(susp->bw_x1_sample);
	    susp->c3p1 = susp->c3co + 1.0;
	    susp->c3t4 = susp->c3co * 4.0;
	    susp->omc3 = 1.0 - susp->c3co;
	    susp->recompute = true;
	}
	togo = MIN(togo, susp->bw_n);
	bw_val = susp->bw_x1_sample;
	if (susp->recompute) {
	    susp->recompute = false;
	    susp->c2 = susp->c3t4 * susp->coshz / susp->c3p1;
	    susp->c1 = (susp->normalization == 0 ? 0.0 :
	          (susp->normalization == 1 ? 1.0 - susp->omc3 * sqrt(1.0 - susp->c2 * susp->c2 / susp->c3t4) :
	           1.0 - sqrt(susp->c3p1 * susp->c3p1 - susp->c2 * susp->c2) * susp->omc3 / susp->c3p1));
	}
	/* don't run past terminate time */
	if (susp->terminate_cnt != UNKNOWN &&
	    susp->terminate_cnt <= susp->susp.current + cnt + togo) {
	    togo = susp->terminate_cnt - (susp->susp.current + cnt);
	    if (togo == 0) break;
	}


	/* don't run past logical stop time */
	if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) {
	    int 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 < 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 = to_stop;
	    }
	}

	n = togo;
	c3co_reg = susp->c3co;
	c2_reg = susp->c2;
	c1_reg = susp->c1;
	recompute_reg = susp->recompute;
	y1_reg = susp->y1;
	y2_reg = susp->y2;
	s1_ptr_reg = susp->s1_ptr;
	out_ptr_reg = out_ptr;
	if (n) do { /* the inner sample computation loop */
            register double y0, current;current = *s1_ptr_reg++;
            y0 = c1_reg * current + c2_reg * y1_reg - c3co_reg * y2_reg;
            *out_ptr_reg++ = (sample_type) y0;
            y2_reg = y1_reg; y1_reg = y0 - current;
	} while (--n); /* inner loop */

	susp->recompute = recompute_reg;
	susp->y1 = y1_reg;
	susp->y2 = y2_reg;
	/* using s1_ptr_reg is a bad idea on RS/6000: */
	susp->s1_ptr += togo;
	out_ptr += togo;
	susp_took(s1_cnt, togo);
	susp->hz1_pHaSe += togo * susp->hz1_pHaSe_iNcR;
	susp->hz1_n -= togo;
	susp->bw_pHaSe += togo * susp->bw_pHaSe_iNcR;
	susp->bw_n -= 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;
    }
} /* aresonvv_nrr_fetch */


void aresonvv_toss_fetch(susp, snd_list)
  register aresonvv_susp_type susp;
  snd_list_type snd_list;
{
    long final_count = susp->susp.toss_cnt;
    time_type final_time = susp->susp.t0;
    long n;

    /* fetch samples from s1 up to final_time for this block of zeros */
    while ((round((final_time - susp->s1->t0) * susp->s1->sr)) >=
	   susp->s1->current)
	susp_get_samples(s1, s1_ptr, s1_cnt);
    /* fetch samples from hz1 up to final_time for this block of zeros */
    while ((round((final_time - susp->hz1->t0) * susp->hz1->sr)) >=
	   susp->hz1->current)
	susp_get_samples(hz1, hz1_ptr, hz1_cnt);
    /* fetch samples from bw up to final_time for this block of zeros */
    while ((round((final_time - susp->bw->t0) * susp->bw->sr)) >=
	   susp->bw->current)
	susp_get_samples(bw, bw_ptr, bw_cnt);
    /* convert to normal processing when we hit final_count */
    /* we want each signal positioned at final_time */
    n = round((final_time - susp->s1->t0) * susp->s1->sr -
         (susp->s1->current - susp->s1_cnt));
    susp->s1_ptr += n;
    susp_took(s1_cnt, n);
    n = round((final_time - susp->hz1->t0) * susp->hz1->sr -
         (susp->hz1->current - susp->hz1_cnt));
    susp->hz1_ptr += n;
    susp_took(hz1_cnt, n);
    n = round((final_time - susp->bw->t0) * susp->bw->sr -
         (susp->bw->current - susp->bw_cnt));
    susp->bw_ptr += n;
    susp_took(bw_cnt, n);
    susp->susp.fetch = susp->susp.keep_fetch;
    (*(susp->susp.fetch))(susp, snd_list);
}


void aresonvv_mark(aresonvv_susp_type susp)
{
    sound_xlmark(susp->s1);
    sound_xlmark(susp->hz1);
    sound_xlmark(susp->bw);
}


void aresonvv_free(aresonvv_susp_type susp)
{
    sound_unref(susp->s1);
    sound_unref(susp->hz1);
    sound_unref(susp->bw);
    ffree_generic(susp, sizeof(aresonvv_susp_node), "aresonvv_free");
}


void aresonvv_print_tree(aresonvv_susp_type susp, int n)
{
    indent(n);
    stdputstr("s1:");
    sound_print_tree_1(susp->s1, n);

    indent(n);
    stdputstr("hz1:");
    sound_print_tree_1(susp->hz1, n);

    indent(n);
    stdputstr("bw:");
    sound_print_tree_1(susp->bw, n);
}


sound_type snd_make_aresonvv(sound_type s1, sound_type hz1, sound_type bw, int normalization)
{
    register aresonvv_susp_type susp;
    rate_type sr = s1->sr;
    time_type t0 = MAX(MAX(s1->t0, hz1->t0), bw->t0);
    int interp_desc = 0;
    sample_type scale_factor = 1.0F;
    time_type t0_min = t0;
    /* combine scale factors of linear inputs (S1) */
    scale_factor *= s1->scale;
    s1->scale = 1.0F;

    /* try to push scale_factor back to a low sr input */
    if (s1->sr < sr) { s1->scale = scale_factor; scale_factor = 1.0F; }

    falloc_generic(susp, aresonvv_susp_node, "snd_make_aresonvv");
    susp->scale1 = s1->scale;
    susp->c3co = 0.0;
    susp->c3p1 = 0.0;
    susp->c3t4 = 0.0;
    susp->omc3 = 0.0;
    susp->coshz = 0.0;
    susp->c2 = 0.0;
    susp->c1 = 0.0;
    susp->recompute = false;
    susp->normalization = normalization;
    susp->y1 = 0.0;
    susp->y2 = 0.0;
    hz1->scale = (sample_type) (hz1->scale * (PI2 / s1->sr));
    bw->scale = (sample_type) (bw->scale * (-PI2 / s1->sr));;

    /* select a susp fn based on sample rates */
    interp_desc = (interp_desc << 2) + interp_style(s1, sr);
    interp_desc = (interp_desc << 2) + interp_style(hz1, sr);
    interp_desc = (interp_desc << 2) + interp_style(bw, sr);
    switch (interp_desc) {
      case INTERP_nnn: /* handled below */
      case INTERP_nns: /* handled below */
      case INTERP_nsn: /* handled below */
      case INTERP_nss: susp->susp.fetch = aresonvv_nss_fetch; break;
      case INTERP_nni: /* handled below */
      case INTERP_nsi: susp->susp.fetch = aresonvv_nsi_fetch; break;
      case INTERP_nnr: /* handled below */
      case INTERP_nsr: susp->susp.fetch = aresonvv_nsr_fetch; break;
      case INTERP_nin: /* handled below */
      case INTERP_nis: susp->susp.fetch = aresonvv_nis_fetch; break;
      case INTERP_nii: susp->susp.fetch = aresonvv_nii_fetch; break;
      case INTERP_nir: susp->susp.fetch = aresonvv_nir_fetch; break;
      case INTERP_nrn: /* handled below */
      case INTERP_nrs: susp->susp.fetch = aresonvv_nrs_fetch; break;
      case INTERP_nri: susp->susp.fetch = aresonvv_nri_fetch; break;
      case INTERP_nrr: susp->susp.fetch = aresonvv_nrr_fetch; break;
      default: snd_badsr(); break;
    }

    susp->terminate_cnt = UNKNOWN;
    /* handle unequal start times, if any */
    if (t0 < s1->t0) sound_prepend_zeros(s1, t0);
    if (t0 < hz1->t0) sound_prepend_zeros(hz1, t0);
    if (t0 < bw->t0) sound_prepend_zeros(bw, t0);
    /* minimum start time over all inputs: */
    t0_min = MIN(s1->t0, MIN(hz1->t0, MIN(bw->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 = aresonvv_toss_fetch;
    }

    /* initialize susp state */
    susp->susp.free = aresonvv_free;
    susp->susp.sr = sr;
    susp->susp.t0 = t0;
    susp->susp.mark = aresonvv_mark;
    susp->susp.print_tree = aresonvv_print_tree;
    susp->susp.name = "aresonvv";
    susp->logically_stopped = false;
    susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s1);
    susp->started = false;
    susp->susp.current = 0;
    susp->s1 = s1;
    susp->s1_cnt = 0;
    susp->hz1 = hz1;
    susp->hz1_cnt = 0;
    susp->hz1_pHaSe = 0.0;
    susp->hz1_pHaSe_iNcR = hz1->sr / sr;
    susp->hz1_n = 0;
    susp->output_per_hz1 = sr / hz1->sr;
    susp->bw = bw;
    susp->bw_cnt = 0;
    susp->bw_pHaSe = 0.0;
    susp->bw_pHaSe_iNcR = bw->sr / sr;
    susp->bw_n = 0;
    susp->output_per_bw = sr / bw->sr;
    return sound_create((snd_susp_type)susp, t0, sr, scale_factor);
}


sound_type snd_aresonvv(sound_type s1, sound_type hz1, sound_type bw, int normalization)
{
    sound_type s1_copy = sound_copy(s1);
    sound_type hz1_copy = sound_copy(hz1);
    sound_type bw_copy = sound_copy(bw);
    return snd_make_aresonvv(s1_copy, hz1_copy, bw_copy, normalization);
}