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2ba45a60 DM |
1 | /* |
2 | * SBG (SBaGen) file format decoder | |
3 | * Copyright (c) 2011 Nicolas George | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <time.h> | |
25 | #include "libavutil/intreadwrite.h" | |
26 | #include "libavutil/log.h" | |
27 | #include "libavutil/opt.h" | |
28 | #include "avformat.h" | |
29 | #include "internal.h" | |
30 | ||
31 | #define SBG_SCALE (1 << 16) | |
32 | #define DAY (24 * 60 * 60) | |
33 | #define DAY_TS ((int64_t)DAY * AV_TIME_BASE) | |
34 | ||
35 | struct sbg_demuxer { | |
36 | AVClass *class; | |
37 | int sample_rate; | |
38 | int frame_size; | |
39 | int max_file_size; | |
40 | }; | |
41 | ||
42 | struct sbg_string { | |
43 | char *s; | |
44 | char *e; | |
45 | }; | |
46 | ||
47 | enum sbg_fade_type { | |
48 | SBG_FADE_SILENCE = 0, | |
49 | SBG_FADE_SAME = 1, | |
50 | SBG_FADE_ADAPT = 3, | |
51 | }; | |
52 | ||
53 | struct sbg_fade { | |
54 | int8_t in, out, slide; | |
55 | }; | |
56 | ||
57 | enum sbg_synth_type { | |
58 | SBG_TYPE_NONE, | |
59 | SBG_TYPE_SINE, | |
60 | SBG_TYPE_NOISE, | |
61 | SBG_TYPE_BELL, | |
62 | SBG_TYPE_MIX, | |
63 | SBG_TYPE_SPIN, | |
64 | }; | |
65 | ||
66 | /* bell: freq constant, ampl decreases exponentially, can be approx lin */ | |
67 | ||
68 | struct sbg_timestamp { | |
69 | int64_t t; | |
70 | char type; /* 0 for relative, 'N' for now, 'T' for absolute */ | |
71 | }; | |
72 | ||
73 | struct sbg_script_definition { | |
74 | char *name; | |
75 | int name_len; | |
76 | int elements, nb_elements; | |
77 | char type; /* 'S' or 'B' */ | |
78 | }; | |
79 | ||
80 | struct sbg_script_synth { | |
81 | int carrier; | |
82 | int beat; | |
83 | int vol; | |
84 | enum sbg_synth_type type; | |
85 | struct { | |
86 | int l, r; | |
87 | } ref; | |
88 | }; | |
89 | ||
90 | struct sbg_script_tseq { | |
91 | struct sbg_timestamp ts; | |
92 | char *name; | |
93 | int name_len; | |
94 | int lock; | |
95 | struct sbg_fade fade; | |
96 | }; | |
97 | ||
98 | struct sbg_script_event { | |
99 | int64_t ts; | |
100 | int64_t ts_int, ts_trans, ts_next; | |
101 | int elements, nb_elements; | |
102 | struct sbg_fade fade; | |
103 | }; | |
104 | ||
105 | struct sbg_script { | |
106 | struct sbg_script_definition *def; | |
107 | struct sbg_script_synth *synth; | |
108 | struct sbg_script_tseq *tseq; | |
109 | struct sbg_script_tseq *block_tseq; | |
110 | struct sbg_script_event *events; | |
111 | int nb_def; | |
112 | int nb_tseq; | |
113 | int nb_events; | |
114 | int nb_synth; | |
115 | int64_t start_ts; | |
116 | int64_t end_ts; | |
117 | int64_t opt_fade_time; | |
118 | int64_t opt_duration; | |
119 | char *opt_mix; | |
120 | int sample_rate; | |
121 | uint8_t opt_start_at_first; | |
122 | uint8_t opt_end_at_last; | |
123 | }; | |
124 | ||
125 | struct sbg_parser { | |
126 | void *log; | |
127 | char *script, *end; | |
128 | char *cursor; | |
129 | struct sbg_script scs; | |
130 | struct sbg_timestamp current_time; | |
131 | int nb_block_tseq; | |
132 | int nb_def_max, nb_synth_max, nb_tseq_max, nb_block_tseq_max; | |
133 | int line_no; | |
134 | char err_msg[128]; | |
135 | }; | |
136 | ||
137 | enum ws_interval_type { | |
138 | WS_SINE = MKTAG('S','I','N','E'), | |
139 | WS_NOISE = MKTAG('N','O','I','S'), | |
140 | }; | |
141 | ||
142 | struct ws_interval { | |
143 | int64_t ts1, ts2; | |
144 | enum ws_interval_type type; | |
145 | uint32_t channels; | |
146 | int32_t f1, f2; | |
147 | int32_t a1, a2; | |
148 | uint32_t phi; | |
149 | }; | |
150 | ||
151 | struct ws_intervals { | |
152 | struct ws_interval *inter; | |
153 | int nb_inter; | |
154 | int max_inter; | |
155 | }; | |
156 | ||
157 | static void *alloc_array_elem(void **array, size_t elsize, | |
158 | int *size, int *max_size) | |
159 | { | |
160 | void *ret; | |
161 | ||
162 | if (*size == *max_size) { | |
163 | int m = FFMAX(32, FFMIN(*max_size, INT_MAX / 2) * 2); | |
164 | if (*size >= m) | |
165 | return NULL; | |
166 | *array = av_realloc_f(*array, m, elsize); | |
167 | if (!*array) | |
168 | return NULL; | |
169 | *max_size = m; | |
170 | } | |
171 | ret = (char *)*array + elsize * *size; | |
172 | memset(ret, 0, elsize); | |
173 | (*size)++; | |
174 | return ret; | |
175 | } | |
176 | ||
177 | static int str_to_time(const char *str, int64_t *rtime) | |
178 | { | |
179 | const char *cur = str; | |
180 | char *end; | |
181 | int hours, minutes; | |
182 | double seconds = 0; | |
183 | ||
184 | if (*cur < '0' || *cur > '9') | |
185 | return 0; | |
186 | hours = strtol(cur, &end, 10); | |
187 | if (end == cur || *end != ':' || end[1] < '0' || end[1] > '9') | |
188 | return 0; | |
189 | cur = end + 1; | |
190 | minutes = strtol(cur, &end, 10); | |
191 | if (end == cur) | |
192 | return 0; | |
193 | cur = end; | |
194 | if (*end == ':'){ | |
195 | seconds = strtod(cur + 1, &end); | |
196 | if (end > cur + 1) | |
197 | cur = end; | |
198 | } | |
199 | *rtime = (hours * 3600 + minutes * 60 + seconds) * AV_TIME_BASE; | |
200 | return cur - str; | |
201 | } | |
202 | ||
203 | static inline int is_space(char c) | |
204 | { | |
205 | return c == ' ' || c == '\t' || c == '\r'; | |
206 | } | |
207 | ||
208 | static inline int scale_double(void *log, double d, double m, int *r) | |
209 | { | |
210 | m *= d * SBG_SCALE; | |
211 | if (m < INT_MIN || m >= INT_MAX) { | |
212 | if (log) | |
213 | av_log(log, AV_LOG_ERROR, "%g is too large\n", d); | |
214 | return AVERROR(EDOM); | |
215 | } | |
216 | *r = m; | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static int lex_space(struct sbg_parser *p) | |
221 | { | |
222 | char *c = p->cursor; | |
223 | ||
224 | while (p->cursor < p->end && is_space(*p->cursor)) | |
225 | p->cursor++; | |
226 | return p->cursor > c; | |
227 | } | |
228 | ||
229 | static int lex_char(struct sbg_parser *p, char c) | |
230 | { | |
231 | int r = p->cursor < p->end && *p->cursor == c; | |
232 | ||
233 | p->cursor += r; | |
234 | return r; | |
235 | } | |
236 | ||
237 | static int lex_double(struct sbg_parser *p, double *r) | |
238 | { | |
239 | double d; | |
240 | char *end; | |
241 | ||
242 | if (p->cursor == p->end || is_space(*p->cursor) || *p->cursor == '\n') | |
243 | return 0; | |
244 | d = strtod(p->cursor, &end); | |
245 | if (end > p->cursor) { | |
246 | *r = d; | |
247 | p->cursor = end; | |
248 | return 1; | |
249 | } | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static int lex_fixed(struct sbg_parser *p, const char *t, int l) | |
254 | { | |
255 | if (p->end - p->cursor < l || memcmp(p->cursor, t, l)) | |
256 | return 0; | |
257 | p->cursor += l; | |
258 | return 1; | |
259 | } | |
260 | ||
261 | static int lex_line_end(struct sbg_parser *p) | |
262 | { | |
263 | if (p->cursor < p->end && *p->cursor == '#') { | |
264 | p->cursor++; | |
265 | while (p->cursor < p->end && *p->cursor != '\n') | |
266 | p->cursor++; | |
267 | } | |
268 | if (p->cursor == p->end) | |
269 | /* simulate final LF for files lacking it */ | |
270 | return 1; | |
271 | if (*p->cursor != '\n') | |
272 | return 0; | |
273 | p->cursor++; | |
274 | p->line_no++; | |
275 | lex_space(p); | |
276 | return 1; | |
277 | } | |
278 | ||
279 | static int lex_wsword(struct sbg_parser *p, struct sbg_string *rs) | |
280 | { | |
281 | char *s = p->cursor, *c = s; | |
282 | ||
283 | if (s == p->end || *s == '\n') | |
284 | return 0; | |
285 | while (c < p->end && *c != '\n' && !is_space(*c)) | |
286 | c++; | |
287 | rs->s = s; | |
288 | rs->e = p->cursor = c; | |
289 | lex_space(p); | |
290 | return 1; | |
291 | } | |
292 | ||
293 | static int lex_name(struct sbg_parser *p, struct sbg_string *rs) | |
294 | { | |
295 | char *s = p->cursor, *c = s; | |
296 | ||
297 | while (c < p->end && ((*c >= 'a' && *c <= 'z') || (*c >= 'A' && *c <= 'Z') | |
298 | || (*c >= '0' && *c <= '9') || *c == '_' || *c == '-')) | |
299 | c++; | |
300 | if (c == s) | |
301 | return 0; | |
302 | rs->s = s; | |
303 | rs->e = p->cursor = c; | |
304 | return 1; | |
305 | } | |
306 | ||
307 | static int lex_time(struct sbg_parser *p, int64_t *rt) | |
308 | { | |
309 | int r = str_to_time(p->cursor, rt); | |
310 | p->cursor += r; | |
311 | return r > 0; | |
312 | } | |
313 | ||
314 | #define FORWARD_ERROR(c) \ | |
315 | do { \ | |
316 | int errcode = c; \ | |
317 | if (errcode <= 0) \ | |
318 | return errcode ? errcode : AVERROR_INVALIDDATA; \ | |
319 | } while(0); | |
320 | ||
321 | static int parse_immediate(struct sbg_parser *p) | |
322 | { | |
323 | snprintf(p->err_msg, sizeof(p->err_msg), | |
324 | "immediate sequences not yet implemented"); | |
325 | return AVERROR_PATCHWELCOME; | |
326 | } | |
327 | ||
328 | static int parse_preprogrammed(struct sbg_parser *p) | |
329 | { | |
330 | snprintf(p->err_msg, sizeof(p->err_msg), | |
331 | "preprogrammed sequences not yet implemented"); | |
332 | return AVERROR_PATCHWELCOME; | |
333 | } | |
334 | ||
335 | static int parse_optarg(struct sbg_parser *p, char o, struct sbg_string *r) | |
336 | { | |
337 | if (!lex_wsword(p, r)) { | |
338 | snprintf(p->err_msg, sizeof(p->err_msg), | |
339 | "option '%c' requires an argument", o); | |
340 | return AVERROR_INVALIDDATA; | |
341 | } | |
342 | return 1; | |
343 | } | |
344 | ||
345 | static int parse_options(struct sbg_parser *p) | |
346 | { | |
347 | struct sbg_string ostr, oarg; | |
348 | char mode = 0; | |
349 | int r; | |
350 | char *tptr; | |
351 | double v; | |
352 | ||
353 | if (p->cursor == p->end || *p->cursor != '-') | |
354 | return 0; | |
355 | while (lex_char(p, '-') && lex_wsword(p, &ostr)) { | |
356 | for (; ostr.s < ostr.e; ostr.s++) { | |
357 | char opt = *ostr.s; | |
358 | switch (opt) { | |
359 | case 'S': | |
360 | p->scs.opt_start_at_first = 1; | |
361 | break; | |
362 | case 'E': | |
363 | p->scs.opt_end_at_last = 1; | |
364 | break; | |
365 | case 'i': | |
366 | mode = 'i'; | |
367 | break; | |
368 | case 'p': | |
369 | mode = 'p'; | |
370 | break; | |
371 | case 'F': | |
372 | FORWARD_ERROR(parse_optarg(p, opt, &oarg)); | |
373 | v = strtod(oarg.s, &tptr); | |
374 | if (oarg.e != tptr) { | |
375 | snprintf(p->err_msg, sizeof(p->err_msg), | |
376 | "syntax error for option -F"); | |
377 | return AVERROR_INVALIDDATA; | |
378 | } | |
379 | p->scs.opt_fade_time = v * AV_TIME_BASE / 1000; | |
380 | break; | |
381 | case 'L': | |
382 | FORWARD_ERROR(parse_optarg(p, opt, &oarg)); | |
383 | r = str_to_time(oarg.s, &p->scs.opt_duration); | |
384 | if (oarg.e != oarg.s + r) { | |
385 | snprintf(p->err_msg, sizeof(p->err_msg), | |
386 | "syntax error for option -L"); | |
387 | return AVERROR_INVALIDDATA; | |
388 | } | |
389 | break; | |
390 | case 'T': | |
391 | FORWARD_ERROR(parse_optarg(p, opt, &oarg)); | |
392 | r = str_to_time(oarg.s, &p->scs.start_ts); | |
393 | if (oarg.e != oarg.s + r) { | |
394 | snprintf(p->err_msg, sizeof(p->err_msg), | |
395 | "syntax error for option -T"); | |
396 | return AVERROR_INVALIDDATA; | |
397 | } | |
398 | break; | |
399 | case 'm': | |
400 | FORWARD_ERROR(parse_optarg(p, opt, &oarg)); | |
401 | tptr = av_malloc(oarg.e - oarg.s + 1); | |
402 | if (!tptr) | |
403 | return AVERROR(ENOMEM); | |
404 | memcpy(tptr, oarg.s, oarg.e - oarg.s); | |
405 | tptr[oarg.e - oarg.s] = 0; | |
406 | av_free(p->scs.opt_mix); | |
407 | p->scs.opt_mix = tptr; | |
408 | break; | |
409 | case 'q': | |
410 | FORWARD_ERROR(parse_optarg(p, opt, &oarg)); | |
411 | v = strtod(oarg.s, &tptr); | |
412 | if (oarg.e != tptr) { | |
413 | snprintf(p->err_msg, sizeof(p->err_msg), | |
414 | "syntax error for option -q"); | |
415 | return AVERROR_INVALIDDATA; | |
416 | } | |
417 | if (v != 1) { | |
418 | snprintf(p->err_msg, sizeof(p->err_msg), | |
419 | "speed factor other than 1 not supported"); | |
420 | return AVERROR_PATCHWELCOME; | |
421 | } | |
422 | break; | |
423 | case 'r': | |
424 | FORWARD_ERROR(parse_optarg(p, opt, &oarg)); | |
425 | r = strtol(oarg.s, &tptr, 10); | |
426 | if (oarg.e != tptr) { | |
427 | snprintf(p->err_msg, sizeof(p->err_msg), | |
428 | "syntax error for option -r"); | |
429 | return AVERROR_INVALIDDATA; | |
430 | } | |
431 | if (r < 40) { | |
432 | snprintf(p->err_msg, sizeof(p->err_msg), | |
433 | "invalid sample rate"); | |
434 | return AVERROR_PATCHWELCOME; | |
435 | } | |
436 | p->scs.sample_rate = r; | |
437 | break; | |
438 | default: | |
439 | snprintf(p->err_msg, sizeof(p->err_msg), | |
440 | "unknown option: '%c'", *ostr.s); | |
441 | return AVERROR_INVALIDDATA; | |
442 | } | |
443 | } | |
444 | } | |
445 | switch (mode) { | |
446 | case 'i': | |
447 | return parse_immediate(p); | |
448 | case 'p': | |
449 | return parse_preprogrammed(p); | |
450 | case 0: | |
451 | if (!lex_line_end(p)) | |
452 | return AVERROR_INVALIDDATA; | |
453 | return 1; | |
454 | } | |
455 | return AVERROR_BUG; | |
456 | } | |
457 | ||
458 | static int parse_timestamp(struct sbg_parser *p, | |
459 | struct sbg_timestamp *rts, int64_t *rrel) | |
460 | { | |
461 | int64_t abs = 0, rel = 0, dt; | |
462 | char type = 0; | |
463 | int r; | |
464 | ||
465 | if (lex_fixed(p, "NOW", 3)) { | |
466 | type = 'N'; | |
467 | r = 1; | |
468 | } else { | |
469 | r = lex_time(p, &abs); | |
470 | if (r) | |
471 | type = 'T'; | |
472 | } | |
473 | while (lex_char(p, '+')) { | |
474 | if (!lex_time(p, &dt)) | |
475 | return AVERROR_INVALIDDATA; | |
476 | rel += dt; | |
477 | r = 1; | |
478 | } | |
479 | if (r) { | |
480 | if (!lex_space(p)) | |
481 | return AVERROR_INVALIDDATA; | |
482 | rts->type = type; | |
483 | rts->t = abs; | |
484 | *rrel = rel; | |
485 | } | |
486 | return r; | |
487 | } | |
488 | ||
489 | static int parse_fade(struct sbg_parser *p, struct sbg_fade *fr) | |
490 | { | |
491 | struct sbg_fade f = {0}; | |
492 | ||
493 | if (lex_char(p, '<')) | |
494 | f.in = SBG_FADE_SILENCE; | |
495 | else if (lex_char(p, '-')) | |
496 | f.in = SBG_FADE_SAME; | |
497 | else if (lex_char(p, '=')) | |
498 | f.in = SBG_FADE_ADAPT; | |
499 | else | |
500 | return 0; | |
501 | if (lex_char(p, '>')) | |
502 | f.out = SBG_FADE_SILENCE; | |
503 | else if (lex_char(p, '-')) | |
504 | f.out = SBG_FADE_SAME; | |
505 | else if (lex_char(p, '=')) | |
506 | f.out = SBG_FADE_ADAPT; | |
507 | else | |
508 | return AVERROR_INVALIDDATA; | |
509 | *fr = f; | |
510 | return 1; | |
511 | } | |
512 | ||
513 | static int parse_time_sequence(struct sbg_parser *p, int inblock) | |
514 | { | |
515 | struct sbg_timestamp ts; | |
516 | int64_t rel_ts; | |
517 | int r; | |
518 | struct sbg_fade fade = { SBG_FADE_SAME, SBG_FADE_SAME, 0 }; | |
519 | struct sbg_string name; | |
520 | struct sbg_script_tseq *tseq; | |
521 | ||
522 | r = parse_timestamp(p, &ts, &rel_ts); | |
523 | if (!r) | |
524 | return 0; | |
525 | if (r < 0) | |
526 | return r; | |
527 | if (ts.type) { | |
528 | if (inblock) | |
529 | return AVERROR_INVALIDDATA; | |
530 | p->current_time.type = ts.type; | |
531 | p->current_time.t = ts.t; | |
532 | } else if(!inblock && !p->current_time.type) { | |
533 | snprintf(p->err_msg, sizeof(p->err_msg), | |
534 | "relative time without previous absolute time"); | |
535 | return AVERROR_INVALIDDATA; | |
536 | } | |
537 | ts.type = p->current_time.type; | |
538 | ts.t = p->current_time.t + rel_ts; | |
539 | r = parse_fade(p, &fade); | |
540 | if (r < 0) | |
541 | return r; | |
542 | lex_space(p); | |
543 | if (!lex_name(p, &name)) | |
544 | return AVERROR_INVALIDDATA; | |
545 | lex_space(p); | |
546 | if (lex_fixed(p, "->", 2)) { | |
547 | fade.slide = SBG_FADE_ADAPT; | |
548 | lex_space(p); | |
549 | } | |
550 | if (!lex_line_end(p)) | |
551 | return AVERROR_INVALIDDATA; | |
552 | tseq = inblock ? | |
553 | alloc_array_elem((void **)&p->scs.block_tseq, sizeof(*tseq), | |
554 | &p->nb_block_tseq, &p->nb_block_tseq_max) : | |
555 | alloc_array_elem((void **)&p->scs.tseq, sizeof(*tseq), | |
556 | &p->scs.nb_tseq, &p->nb_tseq_max); | |
557 | if (!tseq) | |
558 | return AVERROR(ENOMEM); | |
559 | tseq->ts = ts; | |
560 | tseq->name = name.s; | |
561 | tseq->name_len = name.e - name.s; | |
562 | tseq->fade = fade; | |
563 | return 1; | |
564 | } | |
565 | ||
566 | static int parse_wave_def(struct sbg_parser *p, int wavenum) | |
567 | { | |
568 | snprintf(p->err_msg, sizeof(p->err_msg), | |
569 | "waveform definitions not yet implemented"); | |
570 | return AVERROR_PATCHWELCOME; | |
571 | } | |
572 | ||
573 | static int parse_block_def(struct sbg_parser *p, | |
574 | struct sbg_script_definition *def) | |
575 | { | |
576 | int r, tseq; | |
577 | ||
578 | lex_space(p); | |
579 | if (!lex_line_end(p)) | |
580 | return AVERROR_INVALIDDATA; | |
581 | tseq = p->nb_block_tseq; | |
582 | while (1) { | |
583 | r = parse_time_sequence(p, 1); | |
584 | if (r < 0) | |
585 | return r; | |
586 | if (!r) | |
587 | break; | |
588 | } | |
589 | if (!lex_char(p, '}')) | |
590 | return AVERROR_INVALIDDATA; | |
591 | lex_space(p); | |
592 | if (!lex_line_end(p)) | |
593 | return AVERROR_INVALIDDATA; | |
594 | def->type = 'B'; | |
595 | def->elements = tseq; | |
596 | def->nb_elements = p->nb_block_tseq - tseq; | |
597 | if (!def->nb_elements) | |
598 | return AVERROR_INVALIDDATA; | |
599 | return 1; | |
600 | } | |
601 | ||
602 | static int parse_volume(struct sbg_parser *p, int *vol) | |
603 | { | |
604 | double v; | |
605 | ||
606 | if (!lex_char(p, '/')) | |
607 | return 0; | |
608 | if (!lex_double(p, &v)) | |
609 | return AVERROR_INVALIDDATA; | |
610 | if (scale_double(p->log, v, 0.01, vol)) | |
611 | return AVERROR(ERANGE); | |
612 | return 1; | |
613 | } | |
614 | ||
615 | static int parse_synth_channel_sine(struct sbg_parser *p, | |
616 | struct sbg_script_synth *synth) | |
617 | { | |
618 | double carrierf, beatf; | |
619 | int carrier, beat, vol; | |
620 | ||
621 | if (!lex_double(p, &carrierf)) | |
622 | return 0; | |
623 | if (!lex_double(p, &beatf)) | |
624 | beatf = 0; | |
625 | FORWARD_ERROR(parse_volume(p, &vol)); | |
626 | if (scale_double(p->log, carrierf, 1, &carrier) < 0 || | |
627 | scale_double(p->log, beatf, 1, &beat) < 0) | |
628 | return AVERROR(EDOM); | |
629 | synth->type = SBG_TYPE_SINE; | |
630 | synth->carrier = carrier; | |
631 | synth->beat = beat; | |
632 | synth->vol = vol; | |
633 | return 1; | |
634 | } | |
635 | ||
636 | static int parse_synth_channel_pink(struct sbg_parser *p, | |
637 | struct sbg_script_synth *synth) | |
638 | { | |
639 | int vol; | |
640 | ||
641 | if (!lex_fixed(p, "pink", 4)) | |
642 | return 0; | |
643 | FORWARD_ERROR(parse_volume(p, &vol)); | |
644 | synth->type = SBG_TYPE_NOISE; | |
645 | synth->vol = vol; | |
646 | return 1; | |
647 | } | |
648 | ||
649 | static int parse_synth_channel_bell(struct sbg_parser *p, | |
650 | struct sbg_script_synth *synth) | |
651 | { | |
652 | double carrierf; | |
653 | int carrier, vol; | |
654 | ||
655 | if (!lex_fixed(p, "bell", 4)) | |
656 | return 0; | |
657 | if (!lex_double(p, &carrierf)) | |
658 | return AVERROR_INVALIDDATA; | |
659 | FORWARD_ERROR(parse_volume(p, &vol)); | |
660 | if (scale_double(p->log, carrierf, 1, &carrier) < 0) | |
661 | return AVERROR(EDOM); | |
662 | synth->type = SBG_TYPE_BELL; | |
663 | synth->carrier = carrier; | |
664 | synth->vol = vol; | |
665 | return 1; | |
666 | } | |
667 | ||
668 | static int parse_synth_channel_mix(struct sbg_parser *p, | |
669 | struct sbg_script_synth *synth) | |
670 | { | |
671 | int vol; | |
672 | ||
673 | if (!lex_fixed(p, "mix", 3)) | |
674 | return 0; | |
675 | FORWARD_ERROR(parse_volume(p, &vol)); | |
676 | synth->type = SBG_TYPE_MIX; | |
677 | synth->vol = vol; | |
678 | return 1; | |
679 | } | |
680 | ||
681 | static int parse_synth_channel_spin(struct sbg_parser *p, | |
682 | struct sbg_script_synth *synth) | |
683 | { | |
684 | double carrierf, beatf; | |
685 | int carrier, beat, vol; | |
686 | ||
687 | if (!lex_fixed(p, "spin:", 5)) | |
688 | return 0; | |
689 | if (!lex_double(p, &carrierf)) | |
690 | return AVERROR_INVALIDDATA; | |
691 | if (!lex_double(p, &beatf)) | |
692 | return AVERROR_INVALIDDATA; | |
693 | FORWARD_ERROR(parse_volume(p, &vol)); | |
694 | if (scale_double(p->log, carrierf, 1, &carrier) < 0 || | |
695 | scale_double(p->log, beatf, 1, &beat) < 0) | |
696 | return AVERROR(EDOM); | |
697 | synth->type = SBG_TYPE_SPIN; | |
698 | synth->carrier = carrier; | |
699 | synth->beat = beat; | |
700 | synth->vol = vol; | |
701 | return 1; | |
702 | } | |
703 | ||
704 | static int parse_synth_channel(struct sbg_parser *p) | |
705 | { | |
706 | int r; | |
707 | struct sbg_script_synth *synth; | |
708 | ||
709 | synth = alloc_array_elem((void **)&p->scs.synth, sizeof(*synth), | |
710 | &p->scs.nb_synth, &p->nb_synth_max); | |
711 | if (!synth) | |
712 | return AVERROR(ENOMEM); | |
713 | r = lex_char(p, '-'); | |
714 | if (!r) | |
715 | r = parse_synth_channel_pink(p, synth); | |
716 | if (!r) | |
717 | r = parse_synth_channel_bell(p, synth); | |
718 | if (!r) | |
719 | r = parse_synth_channel_mix(p, synth); | |
720 | if (!r) | |
721 | r = parse_synth_channel_spin(p, synth); | |
722 | /* Unimplemented: wave%d:%f%f/vol (carrier, beat) */ | |
723 | if (!r) | |
724 | r = parse_synth_channel_sine(p, synth); | |
725 | if (r <= 0) | |
726 | p->scs.nb_synth--; | |
727 | return r; | |
728 | } | |
729 | ||
730 | static int parse_synth_def(struct sbg_parser *p, | |
731 | struct sbg_script_definition *def) | |
732 | { | |
733 | int r, synth; | |
734 | ||
735 | synth = p->scs.nb_synth; | |
736 | while (1) { | |
737 | r = parse_synth_channel(p); | |
738 | if (r < 0) | |
739 | return r; | |
740 | if (!r || !lex_space(p)) | |
741 | break; | |
742 | } | |
743 | lex_space(p); | |
744 | if (synth == p->scs.nb_synth) | |
745 | return AVERROR_INVALIDDATA; | |
746 | if (!lex_line_end(p)) | |
747 | return AVERROR_INVALIDDATA; | |
748 | def->type = 'S'; | |
749 | def->elements = synth; | |
750 | def->nb_elements = p->scs.nb_synth - synth; | |
751 | return 1; | |
752 | } | |
753 | ||
754 | static int parse_named_def(struct sbg_parser *p) | |
755 | { | |
756 | char *cursor_save = p->cursor; | |
757 | struct sbg_string name; | |
758 | struct sbg_script_definition *def; | |
759 | ||
760 | if (!lex_name(p, &name) || !lex_char(p, ':') || !lex_space(p)) { | |
761 | p->cursor = cursor_save; | |
762 | return 0; | |
763 | } | |
764 | if (name.e - name.s == 6 && !memcmp(name.s, "wave", 4) && | |
765 | name.s[4] >= '0' && name.s[4] <= '9' && | |
766 | name.s[5] >= '0' && name.s[5] <= '9') { | |
767 | int wavenum = (name.s[4] - '0') * 10 + (name.s[5] - '0'); | |
768 | return parse_wave_def(p, wavenum); | |
769 | } | |
770 | def = alloc_array_elem((void **)&p->scs.def, sizeof(*def), | |
771 | &p->scs.nb_def, &p->nb_def_max); | |
772 | if (!def) | |
773 | return AVERROR(ENOMEM); | |
774 | def->name = name.s; | |
775 | def->name_len = name.e - name.s; | |
776 | if (lex_char(p, '{')) | |
777 | return parse_block_def(p, def); | |
778 | return parse_synth_def(p, def); | |
779 | } | |
780 | ||
781 | static void free_script(struct sbg_script *s) | |
782 | { | |
783 | av_freep(&s->def); | |
784 | av_freep(&s->synth); | |
785 | av_freep(&s->tseq); | |
786 | av_freep(&s->block_tseq); | |
787 | av_freep(&s->events); | |
788 | av_freep(&s->opt_mix); | |
789 | } | |
790 | ||
791 | static int parse_script(void *log, char *script, int script_len, | |
792 | struct sbg_script *rscript) | |
793 | { | |
794 | struct sbg_parser sp = { | |
795 | .log = log, | |
796 | .script = script, | |
797 | .end = script + script_len, | |
798 | .cursor = script, | |
799 | .line_no = 1, | |
800 | .err_msg = "", | |
801 | .scs = { | |
802 | /* default values */ | |
803 | .start_ts = AV_NOPTS_VALUE, | |
804 | .sample_rate = 44100, | |
805 | .opt_fade_time = 60 * AV_TIME_BASE, | |
806 | }, | |
807 | }; | |
808 | int r; | |
809 | ||
810 | lex_space(&sp); | |
811 | while (sp.cursor < sp.end) { | |
812 | r = parse_options(&sp); | |
813 | if (r < 0) | |
814 | goto fail; | |
815 | if (!r && !lex_line_end(&sp)) | |
816 | break; | |
817 | } | |
818 | while (sp.cursor < sp.end) { | |
819 | r = parse_named_def(&sp); | |
820 | if (!r) | |
821 | r = parse_time_sequence(&sp, 0); | |
822 | if (!r) | |
823 | r = lex_line_end(&sp) ? 1 : AVERROR_INVALIDDATA; | |
824 | if (r < 0) | |
825 | goto fail; | |
826 | } | |
827 | *rscript = sp.scs; | |
828 | return 1; | |
829 | fail: | |
830 | free_script(&sp.scs); | |
831 | if (!*sp.err_msg) | |
832 | if (r == AVERROR_INVALIDDATA) | |
833 | snprintf(sp.err_msg, sizeof(sp.err_msg), "syntax error"); | |
834 | if (log && *sp.err_msg) { | |
835 | const char *ctx = sp.cursor; | |
836 | const char *ectx = av_x_if_null(memchr(ctx, '\n', sp.end - sp.cursor), | |
837 | sp.end); | |
838 | int lctx = ectx - ctx; | |
839 | const char *quote = "\""; | |
840 | if (lctx > 0 && ctx[lctx - 1] == '\r') | |
841 | lctx--; | |
842 | if (lctx == 0) { | |
843 | ctx = "the end of line"; | |
844 | lctx = strlen(ctx); | |
845 | quote = ""; | |
846 | } | |
847 | av_log(log, AV_LOG_ERROR, "Error line %d: %s near %s%.*s%s.\n", | |
848 | sp.line_no, sp.err_msg, quote, lctx, ctx, quote); | |
849 | } | |
850 | return r; | |
851 | } | |
852 | ||
853 | static int read_whole_file(AVIOContext *io, int max_size, char **rbuf) | |
854 | { | |
855 | char *buf = NULL; | |
856 | int size = 0, bufsize = 0, r; | |
857 | ||
858 | while (1) { | |
859 | if (bufsize - size < 1024) { | |
860 | bufsize = FFMIN(FFMAX(2 * bufsize, 8192), max_size); | |
861 | if (bufsize - size < 2) { | |
862 | size = AVERROR(EFBIG); | |
863 | goto fail; | |
864 | } | |
865 | buf = av_realloc_f(buf, bufsize, 1); | |
866 | if (!buf) { | |
867 | size = AVERROR(ENOMEM); | |
868 | goto fail; | |
869 | } | |
870 | } | |
871 | r = avio_read(io, buf, bufsize - size - 1); | |
872 | if (r == AVERROR_EOF) | |
873 | break; | |
874 | if (r < 0) | |
875 | goto fail; | |
876 | size += r; | |
877 | } | |
878 | buf[size] = 0; | |
879 | *rbuf = buf; | |
880 | return size; | |
881 | fail: | |
882 | av_free(buf); | |
883 | return size; | |
884 | } | |
885 | ||
886 | static void expand_timestamps(void *log, struct sbg_script *s) | |
887 | { | |
888 | int i, nb_rel = 0; | |
889 | int64_t now, cur_ts, delta = 0; | |
890 | ||
891 | for (i = 0; i < s->nb_tseq; i++) | |
892 | nb_rel += s->tseq[i].ts.type == 'N'; | |
893 | if (nb_rel == s->nb_tseq) { | |
894 | /* All ts are relative to NOW: consider NOW = 0 */ | |
895 | now = 0; | |
896 | if (s->start_ts != AV_NOPTS_VALUE) | |
897 | av_log(log, AV_LOG_WARNING, | |
898 | "Start time ignored in a purely relative script.\n"); | |
899 | } else if (nb_rel == 0 && s->start_ts != AV_NOPTS_VALUE || | |
900 | s->opt_start_at_first) { | |
901 | /* All ts are absolute and start time is specified */ | |
902 | if (s->start_ts == AV_NOPTS_VALUE) | |
903 | s->start_ts = s->tseq[0].ts.t; | |
904 | now = s->start_ts; | |
905 | } else { | |
906 | /* Mixed relative/absolute ts: expand */ | |
907 | time_t now0; | |
908 | struct tm *tm; | |
909 | ||
910 | av_log(log, AV_LOG_WARNING, | |
911 | "Scripts with mixed absolute and relative timestamps can give " | |
912 | "unexpected results (pause, seeking, time zone change).\n"); | |
913 | #undef time | |
914 | time(&now0); | |
915 | tm = localtime(&now0); | |
916 | now = tm ? tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec : | |
917 | now0 % DAY; | |
918 | av_log(log, AV_LOG_INFO, "Using %02d:%02d:%02d as NOW.\n", | |
919 | (int)(now / 3600), (int)(now / 60) % 60, (int)now % 60); | |
920 | now *= AV_TIME_BASE; | |
921 | for (i = 0; i < s->nb_tseq; i++) { | |
922 | if (s->tseq[i].ts.type == 'N') { | |
923 | s->tseq[i].ts.t += now; | |
924 | s->tseq[i].ts.type = 'T'; /* not necessary */ | |
925 | } | |
926 | } | |
927 | } | |
928 | if (s->start_ts == AV_NOPTS_VALUE) | |
929 | s->start_ts = s->opt_start_at_first ? s->tseq[0].ts.t : now; | |
930 | s->end_ts = s->opt_duration ? s->start_ts + s->opt_duration : | |
931 | AV_NOPTS_VALUE; /* may be overridden later by -E option */ | |
932 | cur_ts = now; | |
933 | for (i = 0; i < s->nb_tseq; i++) { | |
934 | if (s->tseq[i].ts.t + delta < cur_ts) | |
935 | delta += DAY_TS; | |
936 | cur_ts = s->tseq[i].ts.t += delta; | |
937 | } | |
938 | } | |
939 | ||
940 | static int expand_tseq(void *log, struct sbg_script *s, int *nb_ev_max, | |
941 | int64_t t0, struct sbg_script_tseq *tseq) | |
942 | { | |
943 | int i, r; | |
944 | struct sbg_script_definition *def; | |
945 | struct sbg_script_tseq *be; | |
946 | struct sbg_script_event *ev; | |
947 | ||
948 | if (tseq->lock++) { | |
949 | av_log(log, AV_LOG_ERROR, "Recursion loop on \"%.*s\"\n", | |
950 | tseq->name_len, tseq->name); | |
951 | return AVERROR(EINVAL); | |
952 | } | |
953 | t0 += tseq->ts.t; | |
954 | for (i = 0; i < s->nb_def; i++) { | |
955 | if (s->def[i].name_len == tseq->name_len && | |
956 | !memcmp(s->def[i].name, tseq->name, tseq->name_len)) | |
957 | break; | |
958 | } | |
959 | if (i >= s->nb_def) { | |
960 | av_log(log, AV_LOG_ERROR, "Tone-set \"%.*s\" not defined\n", | |
961 | tseq->name_len, tseq->name); | |
962 | return AVERROR(EINVAL); | |
963 | } | |
964 | def = &s->def[i]; | |
965 | if (def->type == 'B') { | |
966 | be = s->block_tseq + def->elements; | |
967 | for (i = 0; i < def->nb_elements; i++) { | |
968 | r = expand_tseq(log, s, nb_ev_max, t0, &be[i]); | |
969 | if (r < 0) | |
970 | return r; | |
971 | } | |
972 | } else { | |
973 | ev = alloc_array_elem((void **)&s->events, sizeof(*ev), | |
974 | &s->nb_events, nb_ev_max); | |
975 | ev->ts = tseq->ts.t; | |
976 | ev->elements = def->elements; | |
977 | ev->nb_elements = def->nb_elements; | |
978 | ev->fade = tseq->fade; | |
979 | } | |
980 | tseq->lock--; | |
981 | return 0; | |
982 | } | |
983 | ||
984 | static int expand_script(void *log, struct sbg_script *s) | |
985 | { | |
986 | int i, r, nb_events_max = 0; | |
987 | ||
988 | expand_timestamps(log, s); | |
989 | for (i = 0; i < s->nb_tseq; i++) { | |
990 | r = expand_tseq(log, s, &nb_events_max, 0, &s->tseq[i]); | |
991 | if (r < 0) | |
992 | return r; | |
993 | } | |
994 | if (!s->nb_events) { | |
995 | av_log(log, AV_LOG_ERROR, "No events in script\n"); | |
996 | return AVERROR_INVALIDDATA; | |
997 | } | |
998 | if (s->opt_end_at_last) | |
999 | s->end_ts = s->events[s->nb_events - 1].ts; | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static int add_interval(struct ws_intervals *inter, | |
1004 | enum ws_interval_type type, uint32_t channels, int ref, | |
1005 | int64_t ts1, int32_t f1, int32_t a1, | |
1006 | int64_t ts2, int32_t f2, int32_t a2) | |
1007 | { | |
1008 | struct ws_interval *i, *ri; | |
1009 | ||
1010 | if (ref >= 0) { | |
1011 | ri = &inter->inter[ref]; | |
1012 | /* ref and new intervals are constant, identical and adjacent */ | |
1013 | if (ri->type == type && ri->channels == channels && | |
1014 | ri->f1 == ri->f2 && ri->f2 == f1 && f1 == f2 && | |
1015 | ri->a1 == ri->a2 && ri->a2 == a1 && a1 == a2 && | |
1016 | ri->ts2 == ts1) { | |
1017 | ri->ts2 = ts2; | |
1018 | return ref; | |
1019 | } | |
1020 | } | |
1021 | i = alloc_array_elem((void **)&inter->inter, sizeof(*i), | |
1022 | &inter->nb_inter, &inter->max_inter); | |
1023 | if (!i) | |
1024 | return AVERROR(ENOMEM); | |
1025 | i->ts1 = ts1; | |
1026 | i->ts2 = ts2; | |
1027 | i->type = type; | |
1028 | i->channels = channels; | |
1029 | i->f1 = f1; | |
1030 | i->f2 = f2; | |
1031 | i->a1 = a1; | |
1032 | i->a2 = a2; | |
1033 | i->phi = ref >= 0 ? ref | 0x80000000 : 0; | |
1034 | return i - inter->inter; | |
1035 | } | |
1036 | ||
1037 | static int add_bell(struct ws_intervals *inter, struct sbg_script *s, | |
1038 | int64_t ts1, int64_t ts2, int32_t f, int32_t a) | |
1039 | { | |
1040 | /* SBaGen uses an exponential decrease every 50ms. | |
1041 | We approximate it with piecewise affine segments. */ | |
1042 | int32_t cpoints[][2] = { | |
1043 | { 2, a }, | |
1044 | { 4, a - a / 4 }, | |
1045 | { 8, a / 2 }, | |
1046 | { 16, a / 4 }, | |
1047 | { 25, a / 10 }, | |
1048 | { 50, a / 80 }, | |
1049 | { 75, 0 }, | |
1050 | }; | |
1051 | int i, r; | |
1052 | int64_t dt = s->sample_rate / 20, ts3 = ts1, ts4; | |
1053 | for (i = 0; i < FF_ARRAY_ELEMS(cpoints); i++) { | |
1054 | ts4 = FFMIN(ts2, ts1 + cpoints[i][0] * dt); | |
1055 | r = add_interval(inter, WS_SINE, 3, -1, | |
1056 | ts3, f, a, ts4, f, cpoints[i][1]); | |
1057 | if (r < 0) | |
1058 | return r; | |
1059 | ts3 = ts4; | |
1060 | a = cpoints[i][1]; | |
1061 | } | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | static int generate_interval(void *log, struct sbg_script *s, | |
1066 | struct ws_intervals *inter, | |
1067 | int64_t ts1, int64_t ts2, | |
1068 | struct sbg_script_synth *s1, | |
1069 | struct sbg_script_synth *s2, | |
1070 | int transition) | |
1071 | { | |
1072 | int r; | |
1073 | ||
1074 | if (ts2 <= ts1 || (s1->vol == 0 && s2->vol == 0)) | |
1075 | return 0; | |
1076 | switch (s1->type) { | |
1077 | case SBG_TYPE_NONE: | |
1078 | break; | |
1079 | case SBG_TYPE_SINE: | |
1080 | if (s1->beat == 0 && s2->beat == 0) { | |
1081 | r = add_interval(inter, WS_SINE, 3, s1->ref.l, | |
1082 | ts1, s1->carrier, s1->vol, | |
1083 | ts2, s2->carrier, s2->vol); | |
1084 | if (r < 0) | |
1085 | return r; | |
1086 | s2->ref.l = s2->ref.r = r; | |
1087 | } else { | |
1088 | r = add_interval(inter, WS_SINE, 1, s1->ref.l, | |
1089 | ts1, s1->carrier + s1->beat / 2, s1->vol, | |
1090 | ts2, s2->carrier + s2->beat / 2, s2->vol); | |
1091 | if (r < 0) | |
1092 | return r; | |
1093 | s2->ref.l = r; | |
1094 | r = add_interval(inter, WS_SINE, 2, s1->ref.r, | |
1095 | ts1, s1->carrier - s1->beat / 2, s1->vol, | |
1096 | ts2, s2->carrier - s2->beat / 2, s2->vol); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | s2->ref.r = r; | |
1100 | } | |
1101 | break; | |
1102 | ||
1103 | case SBG_TYPE_BELL: | |
1104 | if (transition == 2) { | |
1105 | r = add_bell(inter, s, ts1, ts2, s1->carrier, s2->vol); | |
1106 | if (r < 0) | |
1107 | return r; | |
1108 | } | |
1109 | break; | |
1110 | ||
1111 | case SBG_TYPE_SPIN: | |
1112 | av_log(log, AV_LOG_WARNING, "Spinning noise not implemented, " | |
1113 | "using pink noise instead.\n"); | |
1114 | /* fall through */ | |
1115 | case SBG_TYPE_NOISE: | |
1116 | /* SBaGen's pink noise generator uses: | |
1117 | - 1 band of white noise, mean square: 1/3; | |
1118 | - 9 bands of subsampled white noise with linear | |
1119 | interpolation, mean square: 2/3 each; | |
1120 | with 1/10 weight each: the total mean square is 7/300. | |
1121 | Our pink noise generator uses 8 bands of white noise with | |
1122 | rectangular subsampling: the total mean square is 1/24. | |
1123 | Therefore, to match SBaGen's volume, we must multiply vol by | |
1124 | sqrt((7/300) / (1/24)) = sqrt(14/25) =~ 0.748 | |
1125 | */ | |
1126 | r = add_interval(inter, WS_NOISE, 3, s1->ref.l, | |
1127 | ts1, 0, s1->vol - s1->vol / 4, | |
1128 | ts2, 0, s2->vol - s2->vol / 4); | |
1129 | if (r < 0) | |
1130 | return r; | |
1131 | s2->ref.l = s2->ref.r = r; | |
1132 | break; | |
1133 | ||
1134 | case SBG_TYPE_MIX: | |
1135 | /* Unimplemented: silence; warning present elsewhere */ | |
1136 | default: | |
1137 | av_log(log, AV_LOG_ERROR, | |
1138 | "Type %d is not implemented\n", s1->type); | |
1139 | return AVERROR_PATCHWELCOME; | |
1140 | } | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int generate_plateau(void *log, struct sbg_script *s, | |
1145 | struct ws_intervals *inter, | |
1146 | struct sbg_script_event *ev1) | |
1147 | { | |
1148 | int64_t ts1 = ev1->ts_int, ts2 = ev1->ts_trans; | |
1149 | int i, r; | |
1150 | struct sbg_script_synth *s1; | |
1151 | ||
1152 | for (i = 0; i < ev1->nb_elements; i++) { | |
1153 | s1 = &s->synth[ev1->elements + i]; | |
1154 | r = generate_interval(log, s, inter, ts1, ts2, s1, s1, 0); | |
1155 | if (r < 0) | |
1156 | return r; | |
1157 | } | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | ||
1163 | ts1 ts2 ts1 tsmid ts2 | |
1164 | | | | | | | |
1165 | v v v | v | |
1166 | ____ ____ v ____ | |
1167 | ''''.... ''.. ..'' | |
1168 | ''''....____ ''....'' | |
1169 | ||
1170 | compatible transition incompatible transition | |
1171 | */ | |
1172 | ||
1173 | static int generate_transition(void *log, struct sbg_script *s, | |
1174 | struct ws_intervals *inter, | |
1175 | struct sbg_script_event *ev1, | |
1176 | struct sbg_script_event *ev2) | |
1177 | { | |
1178 | int64_t ts1 = ev1->ts_trans, ts2 = ev1->ts_next; | |
1179 | /* (ts1 + ts2) / 2 without overflow */ | |
1180 | int64_t tsmid = (ts1 >> 1) + (ts2 >> 1) + (ts1 & ts2 & 1); | |
1181 | enum sbg_fade_type type = ev1->fade.slide | (ev1->fade.out & ev2->fade.in); | |
1182 | int nb_elements = FFMAX(ev1->nb_elements, ev2->nb_elements); | |
1183 | struct sbg_script_synth *s1, *s2, s1mod, s2mod, smid; | |
1184 | int pass, i, r; | |
1185 | ||
1186 | for (pass = 0; pass < 2; pass++) { | |
1187 | /* pass = 0 -> compatible and first half of incompatible | |
1188 | pass = 1 -> second half of incompatible | |
1189 | Using two passes like that ensures that the intervals are generated | |
1190 | in increasing order according to their start timestamp. | |
1191 | Otherwise it would be necessary to sort them | |
1192 | while keeping the mutual references. | |
1193 | */ | |
1194 | for (i = 0; i < nb_elements; i++) { | |
1195 | s1 = i < ev1->nb_elements ? &s->synth[ev1->elements + i] : &s1mod; | |
1196 | s2 = i < ev2->nb_elements ? &s->synth[ev2->elements + i] : &s2mod; | |
1197 | s1mod = s1 != &s1mod ? *s1 : (struct sbg_script_synth){ 0 }; | |
1198 | s2mod = s2 != &s2mod ? *s2 : (struct sbg_script_synth){ 0 }; | |
1199 | if (ev1->fade.slide) { | |
1200 | /* for slides, and only for slides, silence ("-") is equivalent | |
1201 | to anything with volume 0 */ | |
1202 | if (s1mod.type == SBG_TYPE_NONE) { | |
1203 | s1mod = s2mod; | |
1204 | s1mod.vol = 0; | |
1205 | } else if (s2mod.type == SBG_TYPE_NONE) { | |
1206 | s2mod = s1mod; | |
1207 | s2mod.vol = 0; | |
1208 | } | |
1209 | } | |
1210 | if (s1mod.type == s2mod.type && | |
1211 | s1mod.type != SBG_TYPE_BELL && | |
1212 | (type == SBG_FADE_ADAPT || | |
1213 | (s1mod.carrier == s2mod.carrier && | |
1214 | s1mod.beat == s2mod.beat))) { | |
1215 | /* compatible: single transition */ | |
1216 | if (!pass) { | |
1217 | r = generate_interval(log, s, inter, | |
1218 | ts1, ts2, &s1mod, &s2mod, 3); | |
1219 | if (r < 0) | |
1220 | return r; | |
1221 | s2->ref = s2mod.ref; | |
1222 | } | |
1223 | } else { | |
1224 | /* incompatible: silence at midpoint */ | |
1225 | if (!pass) { | |
1226 | smid = s1mod; | |
1227 | smid.vol = 0; | |
1228 | r = generate_interval(log, s, inter, | |
1229 | ts1, tsmid, &s1mod, &smid, 1); | |
1230 | if (r < 0) | |
1231 | return r; | |
1232 | } else { | |
1233 | smid = s2mod; | |
1234 | smid.vol = 0; | |
1235 | r = generate_interval(log, s, inter, | |
1236 | tsmid, ts2, &smid, &s2mod, 2); | |
1237 | if (r < 0) | |
1238 | return r; | |
1239 | s2->ref = s2mod.ref; | |
1240 | } | |
1241 | } | |
1242 | } | |
1243 | } | |
1244 | return 0; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | ev1 trats ev2 intts endts ev3 | |
1249 | | | | | | | | |
1250 | v v v v v v | |
1251 | ________________ | |
1252 | .... .... .... | |
1253 | '''....________________....''' '''...._______________ | |
1254 | ||
1255 | \_________/\______________/\_________/\______________/\_________/\_____________/ | |
1256 | tr x->1 int1 tr 1->2 int2 tr 2->3 int3 | |
1257 | */ | |
1258 | ||
1259 | static int generate_intervals(void *log, struct sbg_script *s, int sample_rate, | |
1260 | struct ws_intervals *inter) | |
1261 | { | |
1262 | int64_t trans_time = s->opt_fade_time / 2; | |
1263 | struct sbg_script_event ev0, *ev1, *ev2; | |
1264 | int64_t period; | |
1265 | int i, r; | |
1266 | ||
1267 | /* SBaGen handles the time before and after the extremal events, | |
1268 | and the corresponding transitions, as if the sequence were cyclic | |
1269 | with a 24-hours period. */ | |
1270 | period = s->events[s->nb_events - 1].ts - s->events[0].ts; | |
1271 | period = (period + (DAY_TS - 1)) / DAY_TS * DAY_TS; | |
1272 | period = FFMAX(period, DAY_TS); | |
1273 | ||
1274 | /* Prepare timestamps for transitions */ | |
1275 | for (i = 0; i < s->nb_events; i++) { | |
1276 | ev1 = &s->events[i]; | |
1277 | ev2 = &s->events[(i + 1) % s->nb_events]; | |
1278 | ev1->ts_int = ev1->ts; | |
1279 | ev1->ts_trans = ev1->fade.slide ? ev1->ts | |
1280 | : ev2->ts + (ev1 < ev2 ? 0 : period); | |
1281 | } | |
1282 | for (i = 0; i < s->nb_events; i++) { | |
1283 | ev1 = &s->events[i]; | |
1284 | ev2 = &s->events[(i + 1) % s->nb_events]; | |
1285 | if (!ev1->fade.slide) { | |
1286 | ev1->ts_trans = FFMAX(ev1->ts_int, ev1->ts_trans - trans_time); | |
1287 | ev2->ts_int = FFMIN(ev2->ts_trans, ev2->ts_int + trans_time); | |
1288 | } | |
1289 | ev1->ts_next = ev2->ts_int + (ev1 < ev2 ? 0 : period); | |
1290 | } | |
1291 | ||
1292 | /* Pseudo event before the first one */ | |
1293 | ev0 = s->events[s->nb_events - 1]; | |
1294 | ev0.ts_int -= period; | |
1295 | ev0.ts_trans -= period; | |
1296 | ev0.ts_next -= period; | |
1297 | ||
1298 | /* Convert timestamps */ | |
1299 | for (i = -1; i < s->nb_events; i++) { | |
1300 | ev1 = i < 0 ? &ev0 : &s->events[i]; | |
1301 | ev1->ts_int = av_rescale(ev1->ts_int, sample_rate, AV_TIME_BASE); | |
1302 | ev1->ts_trans = av_rescale(ev1->ts_trans, sample_rate, AV_TIME_BASE); | |
1303 | ev1->ts_next = av_rescale(ev1->ts_next, sample_rate, AV_TIME_BASE); | |
1304 | } | |
1305 | ||
1306 | /* Generate intervals */ | |
1307 | for (i = 0; i < s->nb_synth; i++) | |
1308 | s->synth[i].ref.l = s->synth[i].ref.r = -1; | |
1309 | for (i = -1; i < s->nb_events; i++) { | |
1310 | ev1 = i < 0 ? &ev0 : &s->events[i]; | |
1311 | ev2 = &s->events[(i + 1) % s->nb_events]; | |
1312 | r = generate_plateau(log, s, inter, ev1); | |
1313 | if (r < 0) | |
1314 | return r; | |
1315 | r = generate_transition(log, s, inter, ev1, ev2); | |
1316 | if (r < 0) | |
1317 | return r; | |
1318 | } | |
1319 | if (!inter->nb_inter) | |
1320 | av_log(log, AV_LOG_WARNING, "Completely silent script.\n"); | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | static int encode_intervals(struct sbg_script *s, AVCodecContext *avc, | |
1325 | struct ws_intervals *inter) | |
1326 | { | |
1327 | int i, edata_size = 4; | |
1328 | uint8_t *edata; | |
1329 | ||
1330 | for (i = 0; i < inter->nb_inter; i++) { | |
1331 | edata_size += inter->inter[i].type == WS_SINE ? 44 : | |
1332 | inter->inter[i].type == WS_NOISE ? 32 : 0; | |
1333 | if (edata_size < 0) | |
1334 | return AVERROR(ENOMEM); | |
1335 | } | |
1336 | if (ff_alloc_extradata(avc, edata_size)) | |
1337 | return AVERROR(ENOMEM); | |
1338 | edata = avc->extradata; | |
1339 | ||
1340 | #define ADD_EDATA32(v) do { AV_WL32(edata, (v)); edata += 4; } while(0) | |
1341 | #define ADD_EDATA64(v) do { AV_WL64(edata, (v)); edata += 8; } while(0) | |
1342 | ADD_EDATA32(inter->nb_inter); | |
1343 | for (i = 0; i < inter->nb_inter; i++) { | |
1344 | ADD_EDATA64(inter->inter[i].ts1); | |
1345 | ADD_EDATA64(inter->inter[i].ts2); | |
1346 | ADD_EDATA32(inter->inter[i].type); | |
1347 | ADD_EDATA32(inter->inter[i].channels); | |
1348 | switch (inter->inter[i].type) { | |
1349 | case WS_SINE: | |
1350 | ADD_EDATA32(inter->inter[i].f1); | |
1351 | ADD_EDATA32(inter->inter[i].f2); | |
1352 | ADD_EDATA32(inter->inter[i].a1); | |
1353 | ADD_EDATA32(inter->inter[i].a2); | |
1354 | ADD_EDATA32(inter->inter[i].phi); | |
1355 | break; | |
1356 | case WS_NOISE: | |
1357 | ADD_EDATA32(inter->inter[i].a1); | |
1358 | ADD_EDATA32(inter->inter[i].a2); | |
1359 | break; | |
1360 | } | |
1361 | } | |
1362 | if (edata != avc->extradata + edata_size) | |
1363 | return AVERROR_BUG; | |
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | static av_cold int sbg_read_probe(AVProbeData *p) | |
1368 | { | |
1369 | int r, score; | |
1370 | struct sbg_script script = { 0 }; | |
1371 | ||
1372 | r = parse_script(NULL, p->buf, p->buf_size, &script); | |
1373 | score = r < 0 || !script.nb_def || !script.nb_tseq ? 0 : | |
1374 | AVPROBE_SCORE_MAX / 3; | |
1375 | free_script(&script); | |
1376 | return score; | |
1377 | } | |
1378 | ||
1379 | static av_cold int sbg_read_header(AVFormatContext *avf) | |
1380 | { | |
1381 | struct sbg_demuxer *sbg = avf->priv_data; | |
1382 | int r; | |
1383 | char *buf = NULL; | |
1384 | struct sbg_script script = { 0 }; | |
1385 | AVStream *st; | |
1386 | struct ws_intervals inter = { 0 }; | |
1387 | ||
1388 | r = read_whole_file(avf->pb, sbg->max_file_size, &buf); | |
1389 | if (r < 0) | |
1390 | goto fail; | |
1391 | r = parse_script(avf, buf, r, &script); | |
1392 | if (r < 0) | |
1393 | goto fail; | |
1394 | if (!sbg->sample_rate) | |
1395 | sbg->sample_rate = script.sample_rate; | |
1396 | else | |
1397 | script.sample_rate = sbg->sample_rate; | |
1398 | if (!sbg->frame_size) | |
1399 | sbg->frame_size = FFMAX(1, sbg->sample_rate / 10); | |
1400 | if (script.opt_mix) | |
1401 | av_log(avf, AV_LOG_WARNING, "Mix feature not implemented: " | |
1402 | "-m is ignored and mix channels will be silent.\n"); | |
1403 | r = expand_script(avf, &script); | |
1404 | if (r < 0) | |
1405 | goto fail; | |
1406 | av_freep(&buf); | |
1407 | r = generate_intervals(avf, &script, sbg->sample_rate, &inter); | |
1408 | if (r < 0) | |
1409 | goto fail; | |
1410 | ||
1411 | st = avformat_new_stream(avf, NULL); | |
1412 | if (!st) | |
1413 | return AVERROR(ENOMEM); | |
1414 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
1415 | st->codec->codec_id = AV_CODEC_ID_FFWAVESYNTH; | |
1416 | st->codec->channels = 2; | |
1417 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
1418 | st->codec->sample_rate = sbg->sample_rate; | |
1419 | st->codec->frame_size = sbg->frame_size; | |
1420 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
1421 | st->probe_packets = 0; | |
1422 | st->start_time = av_rescale(script.start_ts, | |
1423 | sbg->sample_rate, AV_TIME_BASE); | |
1424 | st->duration = script.end_ts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE : | |
1425 | av_rescale(script.end_ts - script.start_ts, | |
1426 | sbg->sample_rate, AV_TIME_BASE); | |
1427 | st->cur_dts = st->start_time; | |
1428 | r = encode_intervals(&script, st->codec, &inter); | |
1429 | if (r < 0) | |
1430 | goto fail; | |
1431 | ||
1432 | av_free(inter.inter); | |
1433 | free_script(&script); | |
1434 | return 0; | |
1435 | ||
1436 | fail: | |
1437 | av_free(inter.inter); | |
1438 | free_script(&script); | |
1439 | av_free(buf); | |
1440 | return r; | |
1441 | } | |
1442 | ||
1443 | static int sbg_read_packet(AVFormatContext *avf, AVPacket *packet) | |
1444 | { | |
1445 | int64_t ts, end_ts; | |
1446 | ||
1447 | ts = avf->streams[0]->cur_dts; | |
1448 | end_ts = ts + avf->streams[0]->codec->frame_size; | |
1449 | if (avf->streams[0]->duration != AV_NOPTS_VALUE) | |
1450 | end_ts = FFMIN(avf->streams[0]->start_time + avf->streams[0]->duration, | |
1451 | end_ts); | |
1452 | if (end_ts <= ts) | |
1453 | return AVERROR_EOF; | |
1454 | if (av_new_packet(packet, 12) < 0) | |
1455 | return AVERROR(ENOMEM); | |
1456 | packet->dts = packet->pts = ts; | |
1457 | packet->duration = end_ts - ts; | |
1458 | AV_WL64(packet->data + 0, ts); | |
1459 | AV_WL32(packet->data + 8, packet->duration); | |
1460 | return packet->size; | |
1461 | } | |
1462 | ||
1463 | static int sbg_read_seek2(AVFormatContext *avf, int stream_index, | |
1464 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) | |
1465 | { | |
1466 | if (flags || stream_index > 0) | |
1467 | return AVERROR(EINVAL); | |
1468 | if (stream_index < 0) | |
1469 | ts = av_rescale_q(ts, AV_TIME_BASE_Q, avf->streams[0]->time_base); | |
1470 | avf->streams[0]->cur_dts = ts; | |
1471 | return 0; | |
1472 | } | |
1473 | ||
1474 | static int sbg_read_seek(AVFormatContext *avf, int stream_index, | |
1475 | int64_t ts, int flags) | |
1476 | { | |
1477 | return sbg_read_seek2(avf, stream_index, ts, ts, ts, 0); | |
1478 | } | |
1479 | ||
1480 | static const AVOption sbg_options[] = { | |
1481 | { "sample_rate", "", offsetof(struct sbg_demuxer, sample_rate), | |
1482 | AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, | |
1483 | AV_OPT_FLAG_DECODING_PARAM }, | |
1484 | { "frame_size", "", offsetof(struct sbg_demuxer, frame_size), | |
1485 | AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, | |
1486 | AV_OPT_FLAG_DECODING_PARAM }, | |
1487 | { "max_file_size", "", offsetof(struct sbg_demuxer, max_file_size), | |
1488 | AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, | |
1489 | AV_OPT_FLAG_DECODING_PARAM }, | |
1490 | { NULL }, | |
1491 | }; | |
1492 | ||
1493 | static const AVClass sbg_demuxer_class = { | |
1494 | .class_name = "sbg_demuxer", | |
1495 | .item_name = av_default_item_name, | |
1496 | .option = sbg_options, | |
1497 | .version = LIBAVUTIL_VERSION_INT, | |
1498 | }; | |
1499 | ||
1500 | AVInputFormat ff_sbg_demuxer = { | |
1501 | .name = "sbg", | |
1502 | .long_name = NULL_IF_CONFIG_SMALL("SBaGen binaural beats script"), | |
1503 | .priv_data_size = sizeof(struct sbg_demuxer), | |
1504 | .read_probe = sbg_read_probe, | |
1505 | .read_header = sbg_read_header, | |
1506 | .read_packet = sbg_read_packet, | |
1507 | .read_seek = sbg_read_seek, | |
1508 | .read_seek2 = sbg_read_seek2, | |
1509 | .extensions = "sbg", | |
1510 | .priv_class = &sbg_demuxer_class, | |
1511 | }; |