1 #include "stdio.h"
2 #ifndef mips
3 #include "stdlib.h"
4 #endif
5 #include "xlisp.h"
6 #include "sound.h"
7
8 #include "falloc.h"
9 #include "cext.h"
10 #include "biquadfilt.h"
11
12 void biquadfilt_free(snd_susp_type a_susp);
13
14
15 typedef struct biquadfilt_susp_struct {
16 snd_susp_node susp;
17 int64_t terminate_cnt;
18 boolean logically_stopped;
19 sound_type s;
20 int s_cnt;
21 sample_block_values_type s_ptr;
22
23 double z1;
24 double z2;
25 double b0;
26 double b1;
27 double b2;
28 double a1;
29 double a2;
30 } biquadfilt_susp_node, *biquadfilt_susp_type;
31
32
biquadfilt_n_fetch(snd_susp_type a_susp,snd_list_type snd_list)33 void biquadfilt_n_fetch(snd_susp_type a_susp, snd_list_type snd_list)
34 {
35 biquadfilt_susp_type susp = (biquadfilt_susp_type) a_susp;
36 int cnt = 0; /* how many samples computed */
37 int togo;
38 int n;
39 sample_block_type out;
40 register sample_block_values_type out_ptr;
41
42 register sample_block_values_type out_ptr_reg;
43
44 register double z1_reg;
45 register double z2_reg;
46 register double b0_reg;
47 register double b1_reg;
48 register double b2_reg;
49 register double a1_reg;
50 register double a2_reg;
51 register sample_block_values_type s_ptr_reg;
52 falloc_sample_block(out, "biquadfilt_n_fetch");
53 out_ptr = out->samples;
54 snd_list->block = out;
55
56 while (cnt < max_sample_block_len) { /* outer loop */
57 /* first compute how many samples to generate in inner loop: */
58 /* don't overflow the output sample block: */
59 togo = max_sample_block_len - cnt;
60
61 /* don't run past the s input sample block: */
62 susp_check_term_log_samples(s, s_ptr, s_cnt);
63 togo = min(togo, susp->s_cnt);
64
65 /* don't run past terminate time */
66 if (susp->terminate_cnt != UNKNOWN &&
67 susp->terminate_cnt <= susp->susp.current + cnt + togo) {
68 togo = (int) (susp->terminate_cnt - (susp->susp.current + cnt));
69 if (togo < 0) togo = 0; /* avoids rounding errros */
70 if (togo == 0) break;
71 }
72
73
74 /* don't run past logical stop time */
75 if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) {
76 int64_t to_stop = susp->susp.log_stop_cnt - (susp->susp.current + cnt);
77 /* break if to_stop == 0 (we're at the logical stop)
78 * AND cnt > 0 (we're not at the beginning of the
79 * output block).
80 */
81 if (to_stop < 0) to_stop = 0; /* avoids rounding errors */
82 if (to_stop < togo) {
83 if (to_stop == 0) {
84 if (cnt) {
85 togo = 0;
86 break;
87 } else /* keep togo as is: since cnt == 0, we
88 * can set the logical stop flag on this
89 * output block
90 */
91 susp->logically_stopped = true;
92 } else /* limit togo so we can start a new
93 * block at the LST
94 */
95 togo = (int) to_stop;
96 }
97 }
98
99 n = togo;
100 z1_reg = susp->z1;
101 z2_reg = susp->z2;
102 b0_reg = susp->b0;
103 b1_reg = susp->b1;
104 b2_reg = susp->b2;
105 a1_reg = susp->a1;
106 a2_reg = susp->a2;
107 s_ptr_reg = susp->s_ptr;
108 out_ptr_reg = out_ptr;
109 if (n) do { /* the inner sample computation loop */
110 double z0; z0 = *s_ptr_reg++ + a1_reg*z1_reg + a2_reg*z2_reg;
111 *out_ptr_reg++ = (sample_type) (z0*b0_reg + z1_reg*b1_reg + z2_reg*b2_reg);
112 z2_reg = z1_reg; z1_reg = z0;
113 } while (--n); /* inner loop */
114
115 susp->z1 = z1_reg;
116 susp->z2 = z2_reg;
117 /* using s_ptr_reg is a bad idea on RS/6000: */
118 susp->s_ptr += togo;
119 out_ptr += togo;
120 susp_took(s_cnt, togo);
121 cnt += togo;
122 } /* outer loop */
123
124 /* test for termination */
125 if (togo == 0 && cnt == 0) {
126 snd_list_terminate(snd_list);
127 } else {
128 snd_list->block_len = cnt;
129 susp->susp.current += cnt;
130 }
131 /* test for logical stop */
132 if (susp->logically_stopped) {
133 snd_list->logically_stopped = true;
134 } else if (susp->susp.log_stop_cnt == susp->susp.current) {
135 susp->logically_stopped = true;
136 }
137 } /* biquadfilt_n_fetch */
138
139
biquadfilt_toss_fetch(snd_susp_type a_susp,snd_list_type snd_list)140 void biquadfilt_toss_fetch(snd_susp_type a_susp, snd_list_type snd_list)
141 {
142 biquadfilt_susp_type susp = (biquadfilt_susp_type) a_susp;
143 time_type final_time = susp->susp.t0;
144 int n;
145
146 /* fetch samples from s up to final_time for this block of zeros */
147 while ((ROUNDBIG((final_time - susp->s->t0) * susp->s->sr)) >=
148 susp->s->current)
149 susp_get_samples(s, s_ptr, s_cnt);
150 /* convert to normal processing when we hit final_count */
151 /* we want each signal positioned at final_time */
152 n = (int) ROUNDBIG((final_time - susp->s->t0) * susp->s->sr -
153 (susp->s->current - susp->s_cnt));
154 susp->s_ptr += n;
155 susp_took(s_cnt, n);
156 susp->susp.fetch = susp->susp.keep_fetch;
157 (*(susp->susp.fetch))(a_susp, snd_list);
158 }
159
160
biquadfilt_mark(snd_susp_type a_susp)161 void biquadfilt_mark(snd_susp_type a_susp)
162 {
163 biquadfilt_susp_type susp = (biquadfilt_susp_type) a_susp;
164 sound_xlmark(susp->s);
165 }
166
167
biquadfilt_free(snd_susp_type a_susp)168 void biquadfilt_free(snd_susp_type a_susp)
169 {
170 biquadfilt_susp_type susp = (biquadfilt_susp_type) a_susp;
171 sound_unref(susp->s);
172 ffree_generic(susp, sizeof(biquadfilt_susp_node), "biquadfilt_free");
173 }
174
175
biquadfilt_print_tree(snd_susp_type a_susp,int n)176 void biquadfilt_print_tree(snd_susp_type a_susp, int n)
177 {
178 biquadfilt_susp_type susp = (biquadfilt_susp_type) a_susp;
179 indent(n);
180 stdputstr("s:");
181 sound_print_tree_1(susp->s, n);
182 }
183
184
snd_make_biquadfilt(sound_type s,double b0,double b1,double b2,double a1,double a2,double z1init,double z2init)185 sound_type snd_make_biquadfilt(sound_type s, double b0, double b1, double b2, double a1, double a2, double z1init, double z2init)
186 {
187 register biquadfilt_susp_type susp;
188 rate_type sr = s->sr;
189 time_type t0 = s->t0;
190 sample_type scale_factor = 1.0F;
191 time_type t0_min = t0;
192 /* combine scale factors of linear inputs (S) */
193 scale_factor *= s->scale;
194 s->scale = 1.0F;
195
196 /* try to push scale_factor back to a low sr input */
197 if (s->sr < sr) { s->scale = scale_factor; scale_factor = 1.0F; }
198
199 falloc_generic(susp, biquadfilt_susp_node, "snd_make_biquadfilt");
200 susp->z1 = z1init;
201 susp->z2 = z2init;
202 susp->b0 = b0;
203 susp->b1 = b1;
204 susp->b2 = b2;
205 susp->a1 = a1;
206 susp->a2 = a2;
207 susp->susp.fetch = biquadfilt_n_fetch;
208 susp->terminate_cnt = UNKNOWN;
209 /* handle unequal start times, if any */
210 if (t0 < s->t0) sound_prepend_zeros(s, t0);
211 /* minimum start time over all inputs: */
212 t0_min = min(s->t0, t0);
213 /* how many samples to toss before t0: */
214 susp->susp.toss_cnt = (long) ((t0 - t0_min) * sr + 0.5);
215 if (susp->susp.toss_cnt > 0) {
216 susp->susp.keep_fetch = susp->susp.fetch;
217 susp->susp.fetch = biquadfilt_toss_fetch;
218 }
219
220 /* initialize susp state */
221 susp->susp.free = biquadfilt_free;
222 susp->susp.sr = sr;
223 susp->susp.t0 = t0;
224 susp->susp.mark = biquadfilt_mark;
225 susp->susp.print_tree = biquadfilt_print_tree;
226 susp->susp.name = "biquadfilt";
227 susp->logically_stopped = false;
228 susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s);
229 susp->susp.current = 0;
230 susp->s = s;
231 susp->s_cnt = 0;
232 return sound_create((snd_susp_type)susp, t0, sr, scale_factor);
233 }
234
235
snd_biquadfilt(sound_type s,double b0,double b1,double b2,double a1,double a2,double z1init,double z2init)236 sound_type snd_biquadfilt(sound_type s, double b0, double b1, double b2, double a1, double a2, double z1init, double z2init)
237 {
238 sound_type s_copy = sound_copy(s);
239 return snd_make_biquadfilt(s_copy, b0, b1, b2, a1, a2, z1init, z2init);
240 }
241