eqbandvvv.c

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#include "stdio.h"
#ifndef mips
#include "stdlib.h"
#endif
#include "xlisp.h"
#include "sound.h"

#include "falloc.h"
#include "cext.h"
#include "eqbandvvv.h"

void eqbandvvv_free();


typedef struct eqbandvvv_susp_struct {
    snd_susp_node susp;
    boolean started;
    long terminate_cnt;
    boolean logically_stopped;
    sound_type input;
    long input_cnt;
    sample_block_values_type input_ptr;
    sound_type hz;
    long hz_cnt;
    sample_block_values_type hz_ptr;

    /* support for interpolation of hz */
    sample_type hz_x1_sample;
    double hz_pHaSe;
    double hz_pHaSe_iNcR;

    /* support for ramp between samples of hz */
    double output_per_hz;
    long hz_n;
    sound_type gain;
    long gain_cnt;
    sample_block_values_type gain_ptr;

    /* support for interpolation of gain */
    sample_type gain_x1_sample;
    double gain_pHaSe;
    double gain_pHaSe_iNcR;

    /* support for ramp between samples of gain */
    double output_per_gain;
    long gain_n;
    sound_type width;
    long width_cnt;
    sample_block_values_type width_ptr;

    /* support for interpolation of width */
    sample_type width_x1_sample;
    double width_pHaSe;
    double width_pHaSe_iNcR;

    /* support for ramp between samples of width */
    double output_per_width;
    long width_n;

    double inp_scale;
    double w1;
    double sw;
    double cw;
    double J;
    double gg;
    double b0;
    double b1;
    double b2;
    double a0;
    double a1;
    double a2;
    double z1;
    double z2;
    boolean recompute;
    double inp_period;
} eqbandvvv_susp_node, *eqbandvvv_susp_type;

#define log_of_2_over_2 0.3465735902799726547086


void eqbandvvv_ssss_fetch(register eqbandvvv_susp_type susp, snd_list_type snd_list)
{
    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 double w1_reg;
    register double sw_reg;
    register double cw_reg;
    register double J_reg;
    register double gg_reg;
    register double b0_reg;
    register double b1_reg;
    register double b2_reg;
    register double a0_reg;
    register double a1_reg;
    register double a2_reg;
    register double z1_reg;
    register double z2_reg;
    register boolean recompute_reg;
    register double inp_period_reg;
    register sample_type width_scale_reg = susp->width->scale;
    register sample_block_values_type width_ptr_reg;
    register sample_type gain_scale_reg = susp->gain->scale;
    register sample_block_values_type gain_ptr_reg;
    register sample_type hz_scale_reg = susp->hz->scale;
    register sample_block_values_type hz_ptr_reg;
    register sample_type input_scale_reg = susp->input->scale;
    register sample_block_values_type input_ptr_reg;
    falloc_sample_block(out, "eqbandvvv_ssss_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 input input sample block: */
	susp_check_term_log_samples(input, input_ptr, input_cnt);
	togo = MIN(togo, susp->input_cnt);

	/* don't run past the hz input sample block: */
	susp_check_term_log_samples(hz, hz_ptr, hz_cnt);
	togo = MIN(togo, susp->hz_cnt);

	/* don't run past the gain input sample block: */
	susp_check_term_log_samples(gain, gain_ptr, gain_cnt);
	togo = MIN(togo, susp->gain_cnt);

	/* don't run past the width input sample block: */
	susp_check_term_log_samples(width, width_ptr, width_cnt);
	togo = MIN(togo, susp->width_cnt);

	/* 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;
	w1_reg = susp->w1;
	sw_reg = susp->sw;
	cw_reg = susp->cw;
	J_reg = susp->J;
	gg_reg = susp->gg;
	b0_reg = susp->b0;
	b1_reg = susp->b1;
	b2_reg = susp->b2;
	a0_reg = susp->a0;
	a1_reg = susp->a1;
	a2_reg = susp->a2;
	z1_reg = susp->z1;
	z2_reg = susp->z2;
	recompute_reg = susp->recompute;
	inp_period_reg = susp->inp_period;
	width_ptr_reg = susp->width_ptr;
	gain_ptr_reg = susp->gain_ptr;
	hz_ptr_reg = susp->hz_ptr;
	input_ptr_reg = susp->input_ptr;
	out_ptr_reg = out_ptr;
	if (n) do { /* the inner sample computation loop */
            double z0;
	    w1_reg = PI2 * (hz_scale_reg * *hz_ptr_reg++) * inp_period_reg;
	    sw_reg = sin(w1_reg);
	    cw_reg = cos(w1_reg);
	    b1_reg = -2.0 * cw_reg;
	    a1_reg = -b1_reg;
	    J_reg = sqrt((gain_scale_reg * *gain_ptr_reg++));
	    recompute_reg = true;
	    recompute_reg = true;
	    recompute_reg = true;
	    if (recompute_reg) {
	        /* a0_reg = 1.0 + gg_reg / J_reg; */
	        double a_0_recip = J_reg / (J_reg + gg_reg);
	        recompute_reg = false;
	        gg_reg = sw_reg * sinh(log_of_2_over_2 * (width_scale_reg * *width_ptr_reg++) * w1_reg / sw_reg);
	        b0_reg = (1.0 + gg_reg * J_reg) * a_0_recip;
	        b1_reg *= a_0_recip;
	        b2_reg = (1.0 - gg_reg * J_reg) * a_0_recip;
	        a1_reg *= a_0_recip;
	        a2_reg = (gg_reg / J_reg - 1.0) * a_0_recip;
	    }
    z0 = (input_scale_reg * *input_ptr_reg++) + a1_reg*z1_reg + a2_reg*z2_reg;
    *out_ptr_reg++ = (sample_type) (z0*b0_reg + z1_reg*b1_reg + z2_reg*b2_reg);
    z2_reg = z1_reg; z1_reg = z0;;
	} while (--n); /* inner loop */

	susp->z1 = z1_reg;
	susp->z2 = z2_reg;
	susp->recompute = recompute_reg;
	/* using width_ptr_reg is a bad idea on RS/6000: */
	susp->width_ptr += togo;
	/* using gain_ptr_reg is a bad idea on RS/6000: */
	susp->gain_ptr += togo;
	/* using hz_ptr_reg is a bad idea on RS/6000: */
	susp->hz_ptr += togo;
	/* using input_ptr_reg is a bad idea on RS/6000: */
	susp->input_ptr += togo;
	out_ptr += togo;
	susp_took(input_cnt, togo);
	susp_took(hz_cnt, togo);
	susp_took(gain_cnt, togo);
	susp_took(width_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;
    }
} /* eqbandvvv_ssss_fetch */


void eqbandvvv_siii_fetch(register eqbandvvv_susp_type susp, snd_list_type snd_list)
{
    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 double w1_reg;
    register double sw_reg;
    register double cw_reg;
    register double J_reg;
    register double gg_reg;
    register double b0_reg;
    register double b1_reg;
    register double b2_reg;
    register double a0_reg;
    register double a1_reg;
    register double a2_reg;
    register double z1_reg;
    register double z2_reg;
    register boolean recompute_reg;
    register double inp_period_reg;
    register double width_pHaSe_iNcR_rEg = susp->width_pHaSe_iNcR;
    register double width_pHaSe_ReG;
    register sample_type width_x1_sample_reg;
    register double gain_pHaSe_iNcR_rEg = susp->gain_pHaSe_iNcR;
    register double gain_pHaSe_ReG;
    register sample_type gain_x1_sample_reg;
    register double hz_pHaSe_iNcR_rEg = susp->hz_pHaSe_iNcR;
    register double hz_pHaSe_ReG;
    register sample_type hz_x1_sample_reg;
    register sample_type input_scale_reg = susp->input->scale;
    register sample_block_values_type input_ptr_reg;
    falloc_sample_block(out, "eqbandvvv_siii_fetch");
    out_ptr = out->samples;
    snd_list->block = out;

    /* make sure sounds are primed with first values */
    if (!susp->started) {
	susp->started = true;
	susp_check_term_log_samples(hz, hz_ptr, hz_cnt);
	susp->hz_x1_sample = susp_fetch_sample(hz, hz_ptr, hz_cnt);
	susp->w1 = PI2 * susp->hz_x1_sample * susp->inp_period;
	susp->sw = sin(susp->w1);
	susp->cw = cos(susp->w1);
	susp->b1 = -2.0 * susp->cw;
	susp->a1 = -susp->b1;
	susp->recompute = true;
	susp_check_term_log_samples(gain, gain_ptr, gain_cnt);
	susp->gain_x1_sample = susp_fetch_sample(gain, gain_ptr, gain_cnt);
	susp->J = sqrt(susp->gain_x1_sample);
	susp->recompute = true;
	susp_check_term_log_samples(width, width_ptr, width_cnt);
	susp->width_x1_sample = susp_fetch_sample(width, width_ptr, width_cnt);
	susp->recompute = true;
    }

    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 input input sample block: */
	susp_check_term_log_samples(input, input_ptr, input_cnt);
	togo = MIN(togo, susp->input_cnt);

	/* 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;
	w1_reg = susp->w1;
	sw_reg = susp->sw;
	cw_reg = susp->cw;
	J_reg = susp->J;
	gg_reg = susp->gg;
	b0_reg = susp->b0;
	b1_reg = susp->b1;
	b2_reg = susp->b2;
	a0_reg = susp->a0;
	a1_reg = susp->a1;
	a2_reg = susp->a2;
	z1_reg = susp->z1;
	z2_reg = susp->z2;
	recompute_reg = susp->recompute;
	inp_period_reg = susp->inp_period;
	width_pHaSe_ReG = susp->width_pHaSe;
	width_x1_sample_reg = susp->width_x1_sample;
	gain_pHaSe_ReG = susp->gain_pHaSe;
	gain_x1_sample_reg = susp->gain_x1_sample;
	hz_pHaSe_ReG = susp->hz_pHaSe;
	hz_x1_sample_reg = susp->hz_x1_sample;
	input_ptr_reg = susp->input_ptr;
	out_ptr_reg = out_ptr;
	if (n) do { /* the inner sample computation loop */
            double z0;
	    if (hz_pHaSe_ReG >= 1.0) {
/* fixup-depends hz */
		/* pick up next sample as hz_x1_sample: */
		susp->hz_ptr++;
		susp_took(hz_cnt, 1);
		hz_pHaSe_ReG -= 1.0;
		susp_check_term_log_samples_break(hz, hz_ptr, hz_cnt, hz_x1_sample_reg);
		hz_x1_sample_reg = susp_current_sample(hz, hz_ptr);
		w1_reg = susp->w1 = PI2 * hz_x1_sample_reg * inp_period_reg;
		sw_reg = susp->sw = sin(w1_reg);
		cw_reg = susp->cw = cos(w1_reg);
		b1_reg = susp->b1 = -2.0 * cw_reg;
		a1_reg = susp->a1 = -b1_reg;
		recompute_reg = susp->recompute = true;
	    }
	    if (gain_pHaSe_ReG >= 1.0) {
/* fixup-depends gain */
		/* pick up next sample as gain_x1_sample: */
		susp->gain_ptr++;
		susp_took(gain_cnt, 1);
		gain_pHaSe_ReG -= 1.0;
		susp_check_term_log_samples_break(gain, gain_ptr, gain_cnt, gain_x1_sample_reg);
		gain_x1_sample_reg = susp_current_sample(gain, gain_ptr);
		J_reg = susp->J = sqrt(gain_x1_sample_reg);
		recompute_reg = susp->recompute = true;
	    }
	    if (width_pHaSe_ReG >= 1.0) {
/* fixup-depends width */
		/* pick up next sample as width_x1_sample: */
		susp->width_ptr++;
		susp_took(width_cnt, 1);
		width_pHaSe_ReG -= 1.0;
		susp_check_term_log_samples_break(width, width_ptr, width_cnt, width_x1_sample_reg);
		width_x1_sample_reg = susp_current_sample(width, width_ptr);
		recompute_reg = susp->recompute = true;
	    }
	    if (recompute_reg) {
	        /* a0_reg = 1.0 + gg_reg / J_reg; */
	        double a_0_recip = J_reg / (J_reg + gg_reg);
	        recompute_reg = false;
	        gg_reg = sw_reg * sinh(log_of_2_over_2 * width_x1_sample_reg * w1_reg / sw_reg);
	        b0_reg = (1.0 + gg_reg * J_reg) * a_0_recip;
	        b1_reg *= a_0_recip;
	        b2_reg = (1.0 - gg_reg * J_reg) * a_0_recip;
	        a1_reg *= a_0_recip;
	        a2_reg = (gg_reg / J_reg - 1.0) * a_0_recip;
	    }
    z0 = (input_scale_reg * *input_ptr_reg++) + a1_reg*z1_reg + a2_reg*z2_reg;
    *out_ptr_reg++ = (sample_type) (z0*b0_reg + z1_reg*b1_reg + z2_reg*b2_reg);
    z2_reg = z1_reg; z1_reg = z0;;
	    hz_pHaSe_ReG += hz_pHaSe_iNcR_rEg;
	    gain_pHaSe_ReG += gain_pHaSe_iNcR_rEg;
	    width_pHaSe_ReG += width_pHaSe_iNcR_rEg;
	} while (--n); /* inner loop */