1 /*
2 * libmad - MPEG audio decoder library
3 * Copyright (C) 2000-2003 Underbit Technologies, Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * If you would like to negotiate alternate licensing terms, you may do
20 * so by contacting: Underbit Technologies, Inc. <info@underbit.com>
21 */
22
23 # ifdef __cplusplus
24 extern "C" {
25 # endif
26
27 # define FPM_INTEL
28
29
30
31 # define SIZEOF_INT 4
32 # define SIZEOF_LONG 4
33 # define SIZEOF_LONG_LONG 8
34
35
36 /* Id: version.h,v 1.24 2003/05/27 22:40:37 rob Exp */
37
38 # ifndef LIBMAD_VERSION_H
39 # define LIBMAD_VERSION_H
40
41 # define MAD_VERSION_MAJOR 0
42 # define MAD_VERSION_MINOR 15
43 # define MAD_VERSION_PATCH 0
44 # define MAD_VERSION_EXTRA " (beta)"
45
46 # define MAD_VERSION_STRINGIZE(str) #str
47 # define MAD_VERSION_STRING(num) MAD_VERSION_STRINGIZE(num)
48
49 # define MAD_VERSION MAD_VERSION_STRING(MAD_VERSION_MAJOR) "." \
50 MAD_VERSION_STRING(MAD_VERSION_MINOR) "." \
51 MAD_VERSION_STRING(MAD_VERSION_PATCH) \
52 MAD_VERSION_EXTRA
53
54 # define MAD_PUBLISHYEAR "2000-2003"
55 # define MAD_AUTHOR "Underbit Technologies, Inc."
56 # define MAD_EMAIL "info@underbit.com"
57
58 extern char const mad_version[];
59 extern char const mad_copyright[];
60 extern char const mad_author[];
61 extern char const mad_build[];
62
63 # endif
64
65 /* Id: fixed.h,v 1.36 2003/05/28 04:36:00 rob Exp */
66
67 # ifndef LIBMAD_FIXED_H
68 # define LIBMAD_FIXED_H
69
70 # if SIZEOF_INT >= 4
71 typedef signed int mad_fixed_t;
72
73 typedef signed int mad_fixed64hi_t;
74 typedef unsigned int mad_fixed64lo_t;
75 # else
76 typedef signed long mad_fixed_t;
77
78 typedef signed long mad_fixed64hi_t;
79 typedef unsigned long mad_fixed64lo_t;
80 # endif
81
82 # if defined(_MSC_VER)
83 # define mad_fixed64_t signed __int64
84 # elif 1 || defined(__GNUC__)
85 # define mad_fixed64_t signed long long
86 # endif
87
88 # if defined(FPM_FLOAT)
89 typedef double mad_sample_t;
90 # else
91 typedef mad_fixed_t mad_sample_t;
92 # endif
93
94 /*
95 * Fixed-point format: 0xABBBBBBB
96 * A == whole part (sign + 3 bits)
97 * B == fractional part (28 bits)
98 *
99 * Values are signed two's complement, so the effective range is:
100 * 0x80000000 to 0x7fffffff
101 * -8.0 to +7.9999999962747097015380859375
102 *
103 * The smallest representable value is:
104 * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
105 *
106 * 28 bits of fractional accuracy represent about
107 * 8.6 digits of decimal accuracy.
108 *
109 * Fixed-point numbers can be added or subtracted as normal
110 * integers, but multiplication requires shifting the 64-bit result
111 * from 56 fractional bits back to 28 (and rounding.)
112 *
113 * Changing the definition of MAD_F_FRACBITS is only partially
114 * supported, and must be done with care.
115 */
116
117 # define MAD_F_FRACBITS 28
118
119 # if MAD_F_FRACBITS == 28
120 # define MAD_F(x) ((mad_fixed_t) (x##L))
121 # else
122 # if MAD_F_FRACBITS < 28
123 # warning "MAD_F_FRACBITS < 28"
124 # define MAD_F(x) ((mad_fixed_t) \
125 (((x##L) + \
126 (1L << (28 - MAD_F_FRACBITS - 1))) >> \
127 (28 - MAD_F_FRACBITS)))
128 # elif MAD_F_FRACBITS > 28
129 # error "MAD_F_FRACBITS > 28 not currently supported"
130 # define MAD_F(x) ((mad_fixed_t) \
131 ((x##L) << (MAD_F_FRACBITS - 28)))
132 # endif
133 # endif
134
135 # define MAD_F_MIN ((mad_fixed_t) -0x80000000L)
136 # define MAD_F_MAX ((mad_fixed_t) +0x7fffffffL)
137
138 # define MAD_F_ONE MAD_F(0x10000000)
139
140 # define mad_f_tofixed(x) ((mad_fixed_t) \
141 ((x) * (double) (1L << MAD_F_FRACBITS) + 0.5))
142 # define mad_f_todouble(x) ((double) \
143 ((x) / (double) (1L << MAD_F_FRACBITS)))
144
145 # define mad_f_intpart(x) ((x) >> MAD_F_FRACBITS)
146 # define mad_f_fracpart(x) ((x) & ((1L << MAD_F_FRACBITS) - 1))
147 /* (x should be positive) */
148
149 # define mad_f_fromint(x) ((x) << MAD_F_FRACBITS)
150
151 # define mad_f_add(x, y) ((x) + (y))
152 # define mad_f_sub(x, y) ((x) - (y))
153
154 # if defined(FPM_FLOAT)
155 # error "FPM_FLOAT not yet supported"
156
157 # undef MAD_F
158 # define MAD_F(x) mad_f_todouble(x)
159
160 # define mad_f_mul(x, y) ((x) * (y))
161 # define mad_f_scale64
162
163 # undef ASO_ZEROCHECK
164
165 # elif defined(FPM_64BIT)
166
167 /*
168 * This version should be the most accurate if 64-bit types are supported by
169 * the compiler, although it may not be the most efficient.
170 */
171 # if defined(OPT_ACCURACY)
172 # define mad_f_mul(x, y) \
173 ((mad_fixed_t) \
174 ((((mad_fixed64_t) (x) * (y)) + \
175 (1L << (MAD_F_SCALEBITS - 1))) >> MAD_F_SCALEBITS))
176 # else
177 # define mad_f_mul(x, y) \
178 ((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS))
179 # endif
180
181 # define MAD_F_SCALEBITS MAD_F_FRACBITS
182
183 /* --- Intel --------------------------------------------------------------- */
184
185 # elif defined(FPM_INTEL)
186
187 # if defined(_MSC_VER)
188 # pragma warning(push)
189 # pragma warning(disable: 4035) /* no return value */
190 static __forceinline
mad_f_mul_inline(mad_fixed_t x,mad_fixed_t y)191 mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y)
192 {
193 enum {
194 fracbits = MAD_F_FRACBITS
195 };
196
197 __asm {
198 mov eax, x
199 imul y
200 shrd eax, edx, fracbits
201 }
202
203 /* implicit return of eax */
204 }
205 # pragma warning(pop)
206
207 # define mad_f_mul mad_f_mul_inline
208 # define mad_f_scale64
209 # else
210 /*
211 * This Intel version is fast and accurate; the disposition of the least
212 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
213 */
214 # define MAD_F_MLX(hi, lo, x, y) \
215 asm ("imull %3" \
216 : "=a" (lo), "=d" (hi) \
217 : "%a" (x), "rm" (y) \
218 : "cc")
219
220 # if defined(OPT_ACCURACY)
221 /*
222 * This gives best accuracy but is not very fast.
223 */
224 # define MAD_F_MLA(hi, lo, x, y) \
225 ({ mad_fixed64hi_t __hi; \
226 mad_fixed64lo_t __lo; \
227 MAD_F_MLX(__hi, __lo, (x), (y)); \
228 asm ("addl %2,%0\n\t" \
229 "adcl %3,%1" \
230 : "=rm" (lo), "=rm" (hi) \
231 : "r" (__lo), "r" (__hi), "0" (lo), "1" (hi) \
232 : "cc"); \
233 })
234 # endif /* OPT_ACCURACY */
235
236 # if defined(OPT_ACCURACY)
237 /*
238 * Surprisingly, this is faster than SHRD followed by ADC.
239 */
240 # define mad_f_scale64(hi, lo) \
241 ({ mad_fixed64hi_t __hi_; \
242 mad_fixed64lo_t __lo_; \
243 mad_fixed_t __result; \
244 asm ("addl %4,%2\n\t" \
245 "adcl %5,%3" \
246 : "=rm" (__lo_), "=rm" (__hi_) \
247 : "0" (lo), "1" (hi), \
248 "ir" (1L << (MAD_F_SCALEBITS - 1)), "ir" (0) \
249 : "cc"); \
250 asm ("shrdl %3,%2,%1" \
251 : "=rm" (__result) \
252 : "0" (__lo_), "r" (__hi_), "I" (MAD_F_SCALEBITS) \
253 : "cc"); \
254 __result; \
255 })
256 # else
257 # define mad_f_scale64(hi, lo) \
258 ({ mad_fixed_t __result; \
259 asm ("shrdl %3,%2,%1" \
260 : "=rm" (__result) \
261 : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS) \
262 : "cc"); \
263 __result; \
264 })
265 # endif /* OPT_ACCURACY */
266
267 # define MAD_F_SCALEBITS MAD_F_FRACBITS
268 # endif
269
270 /* --- ARM ----------------------------------------------------------------- */
271
272 # elif defined(FPM_ARM)
273
274 /*
275 * This ARM V4 version is as accurate as FPM_64BIT but much faster. The
276 * least significant bit is properly rounded at no CPU cycle cost!
277 */
278 # if 1
279 /*
280 * This is faster than the default implementation via MAD_F_MLX() and
281 * mad_f_scale64().
282 */
283 # define mad_f_mul(x, y) \
284 ({ mad_fixed64hi_t __hi; \
285 mad_fixed64lo_t __lo; \
286 mad_fixed_t __result; \
287 asm ("smull %0, %1, %3, %4\n\t" \
288 "movs %0, %0, lsr %5\n\t" \
289 "adc %2, %0, %1, lsl %6" \
290 : "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
291 : "%r" (x), "r" (y), \
292 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
293 : "cc"); \
294 __result; \
295 })
296 # endif
297
298 # define MAD_F_MLX(hi, lo, x, y) \
299 asm ("smull %0, %1, %2, %3" \
300 : "=&r" (lo), "=&r" (hi) \
301 : "%r" (x), "r" (y))
302
303 # define MAD_F_MLA(hi, lo, x, y) \
304 asm ("smlal %0, %1, %2, %3" \
305 : "+r" (lo), "+r" (hi) \
306 : "%r" (x), "r" (y))
307
308 # define MAD_F_MLN(hi, lo) \
309 asm ("rsbs %0, %2, #0\n\t" \
310 "rsc %1, %3, #0" \
311 : "=r" (lo), "=r" (hi) \
312 : "0" (lo), "1" (hi) \
313 : "cc")
314
315 # define mad_f_scale64(hi, lo) \
316 ({ mad_fixed_t __result; \
317 asm ("movs %0, %1, lsr %3\n\t" \
318 "adc %0, %0, %2, lsl %4" \
319 : "=&r" (__result) \
320 : "r" (lo), "r" (hi), \
321 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
322 : "cc"); \
323 __result; \
324 })
325
326 # define MAD_F_SCALEBITS MAD_F_FRACBITS
327
328 /* --- MIPS ---------------------------------------------------------------- */
329
330 # elif defined(FPM_MIPS)
331
332 /*
333 * This MIPS version is fast and accurate; the disposition of the least
334 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
335 */
336 # define MAD_F_MLX(hi, lo, x, y) \
337 asm ("mult %2,%3" \
338 : "=l" (lo), "=h" (hi) \
339 : "%r" (x), "r" (y))
340
341 # if defined(HAVE_MADD_ASM)
342 # define MAD_F_MLA(hi, lo, x, y) \
343 asm ("madd %2,%3" \
344 : "+l" (lo), "+h" (hi) \
345 : "%r" (x), "r" (y))
346 # elif defined(HAVE_MADD16_ASM)
347 /*
348 * This loses significant accuracy due to the 16-bit integer limit in the
349 * multiply/accumulate instruction.
350 */
351 # define MAD_F_ML0(hi, lo, x, y) \
352 asm ("mult %2,%3" \
353 : "=l" (lo), "=h" (hi) \
354 : "%r" ((x) >> 12), "r" ((y) >> 16))
355 # define MAD_F_MLA(hi, lo, x, y) \
356 asm ("madd16 %2,%3" \
357 : "+l" (lo), "+h" (hi) \
358 : "%r" ((x) >> 12), "r" ((y) >> 16))
359 # define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo))
360 # endif
361
362 # if defined(OPT_SPEED)
363 # define mad_f_scale64(hi, lo) \
364 ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS)))
365 # define MAD_F_SCALEBITS MAD_F_FRACBITS
366 # endif
367
368 /* --- SPARC --------------------------------------------------------------- */
369
370 # elif defined(FPM_SPARC)
371
372 /*
373 * This SPARC V8 version is fast and accurate; the disposition of the least
374 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
375 */
376 # define MAD_F_MLX(hi, lo, x, y) \
377 asm ("smul %2, %3, %0\n\t" \
378 "rd %%y, %1" \
379 : "=r" (lo), "=r" (hi) \
380 : "%r" (x), "rI" (y))
381
382 /* --- PowerPC ------------------------------------------------------------- */
383
384 # elif defined(FPM_PPC)
385
386 /*
387 * This PowerPC version is fast and accurate; the disposition of the least
388 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
389 */
390 # define MAD_F_MLX(hi, lo, x, y) \
391 do { \
392 asm ("mullw %0,%1,%2" \
393 : "=r" (lo) \
394 : "%r" (x), "r" (y)); \
395 asm ("mulhw %0,%1,%2" \
396 : "=r" (hi) \
397 : "%r" (x), "r" (y)); \
398 } \
399 while (0)
400
401 # if defined(OPT_ACCURACY)
402 /*
403 * This gives best accuracy but is not very fast.
404 */
405 # define MAD_F_MLA(hi, lo, x, y) \
406 ({ mad_fixed64hi_t __hi; \
407 mad_fixed64lo_t __lo; \
408 MAD_F_MLX(__hi, __lo, (x), (y)); \
409 asm ("addc %0,%2,%3\n\t" \
410 "adde %1,%4,%5" \
411 : "=r" (lo), "=r" (hi) \
412 : "%r" (lo), "r" (__lo), \
413 "%r" (hi), "r" (__hi) \
414 : "xer"); \
415 })
416 # endif
417
418 # if defined(OPT_ACCURACY)
419 /*
420 * This is slower than the truncating version below it.
421 */
422 # define mad_f_scale64(hi, lo) \
423 ({ mad_fixed_t __result, __round; \
424 asm ("rotrwi %0,%1,%2" \
425 : "=r" (__result) \
426 : "r" (lo), "i" (MAD_F_SCALEBITS)); \
427 asm ("extrwi %0,%1,1,0" \
428 : "=r" (__round) \
429 : "r" (__result)); \
430 asm ("insrwi %0,%1,%2,0" \
431 : "+r" (__result) \
432 : "r" (hi), "i" (MAD_F_SCALEBITS)); \
433 asm ("add %0,%1,%2" \
434 : "=r" (__result) \
435 : "%r" (__result), "r" (__round)); \
436 __result; \
437 })
438 # else
439 # define mad_f_scale64(hi, lo) \
440 ({ mad_fixed_t __result; \
441 asm ("rotrwi %0,%1,%2" \
442 : "=r" (__result) \
443 : "r" (lo), "i" (MAD_F_SCALEBITS)); \
444 asm ("insrwi %0,%1,%2,0" \
445 : "+r" (__result) \
446 : "r" (hi), "i" (MAD_F_SCALEBITS)); \
447 __result; \
448 })
449 # endif
450
451 # define MAD_F_SCALEBITS MAD_F_FRACBITS
452
453 /* --- Default ------------------------------------------------------------- */
454
455 # elif defined(FPM_DEFAULT)
456
457 /*
458 * This version is the most portable but it loses significant accuracy.
459 * Furthermore, accuracy is biased against the second argument, so care
460 * should be taken when ordering operands.
461 *
462 * The scale factors are constant as this is not used with SSO.
463 *
464 * Pre-rounding is required to stay within the limits of compliance.
465 */
466 # if defined(OPT_SPEED)
467 # define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16))
468 # else
469 # define mad_f_mul(x, y) ((((x) + (1L << 11)) >> 12) * \
470 (((y) + (1L << 15)) >> 16))
471 # endif
472
473 /* ------------------------------------------------------------------------- */
474
475 # else
476 # error "no FPM selected"
477 # endif
478
479 /* default implementations */
480
481 # if !defined(mad_f_mul)
482 # define mad_f_mul(x, y) \
483 ({ register mad_fixed64hi_t __hi; \
484 register mad_fixed64lo_t __lo; \
485 MAD_F_MLX(__hi, __lo, (x), (y)); \
486 mad_f_scale64(__hi, __lo); \
487 })
488 # endif
489
490 # if !defined(MAD_F_MLA)
491 # define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y)))
492 # define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y)))
493 # define MAD_F_MLN(hi, lo) ((lo) = -(lo))
494 # define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo))
495 # endif
496
497 # if !defined(MAD_F_ML0)
498 # define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y))
499 # endif
500
501 # if !defined(MAD_F_MLN)
502 # define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi))
503 # endif
504
505 # if !defined(MAD_F_MLZ)
506 # define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo))
507 # endif
508
509 # if !defined(mad_f_scale64)
510 # if defined(OPT_ACCURACY)
511 # define mad_f_scale64(hi, lo) \
512 ((((mad_fixed_t) \
513 (((hi) << (32 - (MAD_F_SCALEBITS - 1))) | \
514 ((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1)
515 # else
516 # define mad_f_scale64(hi, lo) \
517 ((mad_fixed_t) \
518 (((hi) << (32 - MAD_F_SCALEBITS)) | \
519 ((lo) >> MAD_F_SCALEBITS)))
520 # endif
521 # define MAD_F_SCALEBITS MAD_F_FRACBITS
522 # endif
523
524 /* C routines */
525
526 mad_fixed_t mad_f_abs(mad_fixed_t);
527 mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t);
528
529 # endif
530
531 /* Id: bit.h,v 1.11 2003/05/27 22:40:36 rob Exp */
532
533 # ifndef LIBMAD_BIT_H
534 # define LIBMAD_BIT_H
535
536 struct mad_bitptr {
537 unsigned char const *byte;
538 unsigned short cache;
539 unsigned short left;
540 };
541
542 void mad_bit_init(struct mad_bitptr *, unsigned char const *);
543
544 # define mad_bit_finish(bitptr) /* nothing */
545
546 unsigned int mad_bit_length(struct mad_bitptr const *,
547 struct mad_bitptr const *);
548
549 # define mad_bit_bitsleft(bitptr) ((bitptr)->left)
550 unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *);
551
552 void mad_bit_skip(struct mad_bitptr *, unsigned int);
553 unsigned long mad_bit_read(struct mad_bitptr *, unsigned int);
554 void mad_bit_write(struct mad_bitptr *, unsigned int, unsigned long);
555
556 unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short);
557
558 # endif
559
560 /* Id: timer.h,v 1.15 2003/05/27 22:40:37 rob Exp */
561
562 # ifndef LIBMAD_TIMER_H
563 # define LIBMAD_TIMER_H
564
565 typedef struct {
566 signed long seconds; /* whole seconds */
567 unsigned long fraction; /* 1/MAD_TIMER_RESOLUTION seconds */
568 } mad_timer_t;
569
570 extern mad_timer_t const mad_timer_zero;
571
572 # define MAD_TIMER_RESOLUTION 352800000UL
573
574 enum mad_units {
575 MAD_UNITS_HOURS = -2,
576 MAD_UNITS_MINUTES = -1,
577 MAD_UNITS_SECONDS = 0,
578
579 /* metric units */
580
581 MAD_UNITS_DECISECONDS = 10,
582 MAD_UNITS_CENTISECONDS = 100,
583 MAD_UNITS_MILLISECONDS = 1000,
584
585 /* audio sample units */
586
587 MAD_UNITS_8000_HZ = 8000,
588 MAD_UNITS_11025_HZ = 11025,
589 MAD_UNITS_12000_HZ = 12000,
590
591 MAD_UNITS_16000_HZ = 16000,
592 MAD_UNITS_22050_HZ = 22050,
593 MAD_UNITS_24000_HZ = 24000,
594
595 MAD_UNITS_32000_HZ = 32000,
596 MAD_UNITS_44100_HZ = 44100,
597 MAD_UNITS_48000_HZ = 48000,
598
599 /* video frame/field units */
600
601 MAD_UNITS_24_FPS = 24,
602 MAD_UNITS_25_FPS = 25,
603 MAD_UNITS_30_FPS = 30,
604 MAD_UNITS_48_FPS = 48,
605 MAD_UNITS_50_FPS = 50,
606 MAD_UNITS_60_FPS = 60,
607
608 /* CD audio frames */
609
610 MAD_UNITS_75_FPS = 75,
611
612 /* video drop-frame units */
613
614 MAD_UNITS_23_976_FPS = -24,
615 MAD_UNITS_24_975_FPS = -25,
616 MAD_UNITS_29_97_FPS = -30,
617 MAD_UNITS_47_952_FPS = -48,
618 MAD_UNITS_49_95_FPS = -50,
619 MAD_UNITS_59_94_FPS = -60
620 };
621
622 # define mad_timer_reset(timer) ((void) (*(timer) = mad_timer_zero))
623
624 int mad_timer_compare(mad_timer_t, mad_timer_t);
625
626 # define mad_timer_sign(timer) mad_timer_compare((timer), mad_timer_zero)
627
628 void mad_timer_negate(mad_timer_t *);
629 mad_timer_t mad_timer_abs(mad_timer_t);
630
631 void mad_timer_set(mad_timer_t *, unsigned long, unsigned long, unsigned long);
632 void mad_timer_add(mad_timer_t *, mad_timer_t);
633 void mad_timer_multiply(mad_timer_t *, signed long);
634
635 signed long mad_timer_count(mad_timer_t, enum mad_units);
636 unsigned long mad_timer_fraction(mad_timer_t, unsigned long);
637 void mad_timer_string(mad_timer_t, char *, char const *,
638 enum mad_units, enum mad_units, unsigned long);
639
640 # endif
641
642 /* Id: stream.h,v 1.18 2003/05/27 22:40:37 rob Exp */
643
644 # ifndef LIBMAD_STREAM_H
645 # define LIBMAD_STREAM_H
646
647
648 # define MAD_BUFFER_GUARD 8
649 # define MAD_BUFFER_MDLEN (511 + 2048 + MAD_BUFFER_GUARD)
650
651 enum mad_error {
652 MAD_ERROR_NONE = 0x0000, /* no error */
653
654 MAD_ERROR_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
655 MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
656
657 MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
658
659 MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
660 MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
661 MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
662 MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
663 MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
664
665 MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
666 MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
667 MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
668 MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
669 MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
670 MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
671 MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
672 MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
673 MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
674 MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
675 MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
676 MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
677 };
678
679 # define MAD_RECOVERABLE(error) ((error) & 0xff00)
680
681 struct mad_stream {
682 unsigned char const *buffer; /* input bitstream buffer */
683 unsigned char const *bufend; /* end of buffer */
684 unsigned long skiplen; /* bytes to skip before next frame */
685
686 int sync; /* stream sync found */
687 unsigned long freerate; /* free bitrate (fixed) */
688
689 unsigned char const *this_frame; /* start of current frame */
690 unsigned char const *next_frame; /* start of next frame */
691 struct mad_bitptr ptr; /* current processing bit pointer */
692
693 struct mad_bitptr anc_ptr; /* ancillary bits pointer */
694 unsigned int anc_bitlen; /* number of ancillary bits */
695
696 unsigned char (*main_data)[MAD_BUFFER_MDLEN];
697 /* Layer III main_data() */
698 unsigned int md_len; /* bytes in main_data */
699
700 int options; /* decoding options (see below) */
701 enum mad_error error; /* error code (see above) */
702 };
703
704 enum {
705 MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
706 MAD_OPTION_HALFSAMPLERATE = 0x0002 /* generate PCM at 1/2 sample rate */
707 # if 0 /* not yet implemented */
708 MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
709 MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
710 MAD_OPTION_SINGLECHANNEL = 0x0030 /* combine channels */
711 # endif
712 };
713
714 void mad_stream_init(struct mad_stream *);
715 void mad_stream_finish(struct mad_stream *);
716
717 # define mad_stream_options(stream, opts) \
718 ((void) ((stream)->options = (opts)))
719
720 void mad_stream_buffer(struct mad_stream *,
721 unsigned char const *, unsigned long);
722 void mad_stream_skip(struct mad_stream *, unsigned long);
723
724 int mad_stream_sync(struct mad_stream *);
725
726 char const *mad_stream_errorstr(struct mad_stream const *);
727
728 # endif
729
730 /* Id: frame.h,v 1.19 2003/05/27 22:40:36 rob Exp */
731
732 # ifndef LIBMAD_FRAME_H
733 # define LIBMAD_FRAME_H
734
735
736 enum mad_layer {
737 MAD_LAYER_I = 1, /* Layer I */
738 MAD_LAYER_II = 2, /* Layer II */
739 MAD_LAYER_III = 3 /* Layer III */
740 };
741
742 enum mad_mode {
743 MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */
744 MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */
745 MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */
746 MAD_MODE_STEREO = 3 /* normal LR stereo */
747 };
748
749 enum mad_emphasis {
750 MAD_EMPHASIS_NONE = 0, /* no emphasis */
751 MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */
752 MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */
753 MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */
754 };
755
756 struct mad_header {
757 enum mad_layer layer; /* audio layer (1, 2, or 3) */
758 enum mad_mode mode; /* channel mode (see above) */
759 int mode_extension; /* additional mode info */
760 enum mad_emphasis emphasis; /* de-emphasis to use (see above) */
761
762 unsigned long bitrate; /* stream bitrate (bps) */
763 unsigned int samplerate; /* sampling frequency (Hz) */
764
765 unsigned short crc_check; /* frame CRC accumulator */
766 unsigned short crc_target; /* final target CRC checksum */
767
768 int flags; /* flags (see below) */
769 int private_bits; /* private bits (see below) */
770
771 mad_timer_t duration; /* audio playing time of frame */
772 };
773
774 struct mad_frame {
775 struct mad_header header; /* MPEG audio header */
776
777 int options; /* decoding options (from stream) */
778
779 mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
780 mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
781 };
782
783 # define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)
784 # define MAD_NSBSAMPLES(header) \
785 ((header)->layer == MAD_LAYER_I ? 12 : \
786 (((header)->layer == MAD_LAYER_III && \
787 ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
788
789 enum {
790 MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */
791 MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */
792
793 MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */
794 MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */
795 MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */
796 MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */
797
798 MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */
799 MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */
800 MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */
801
802 MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */
803 MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */
804 MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */
805 };
806
807 enum {
808 MAD_PRIVATE_HEADER = 0x0100, /* header private bit */
809 MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */
810 };
811
812 void mad_header_init(struct mad_header *);
813
814 # define mad_header_finish(header) /* nothing */
815
816 int mad_header_decode(struct mad_header *, struct mad_stream *);
817
818 void mad_frame_init(struct mad_frame *);
819 void mad_frame_finish(struct mad_frame *);
820
821 int mad_frame_decode(struct mad_frame *, struct mad_stream *);
822
823 void mad_frame_mute(struct mad_frame *);
824
825 # endif
826
827 /* Id: synth.h,v 1.14 2003/05/27 22:40:37 rob Exp */
828
829 # ifndef LIBMAD_SYNTH_H
830 # define LIBMAD_SYNTH_H
831
832
833 struct mad_pcm {
834 unsigned int samplerate; /* sampling frequency (Hz) */
835 unsigned short channels; /* number of channels */
836 unsigned short length; /* number of samples per channel */
837 mad_fixed_t samples[2][1152]; /* PCM output samples [ch][sample] */
838 };
839
840 struct mad_synth {
841 mad_fixed_t filter[2][2][2][16][8]; /* polyphase filterbank outputs */
842 /* [ch][eo][peo][s][v] */
843
844 unsigned int phase; /* current processing phase */
845
846 struct mad_pcm pcm; /* PCM output */
847 };
848
849 /* single channel PCM selector */
850 enum {
851 MAD_PCM_CHANNEL_SINGLE = 0
852 };
853
854 /* dual channel PCM selector */
855 enum {
856 MAD_PCM_CHANNEL_DUAL_1 = 0,
857 MAD_PCM_CHANNEL_DUAL_2 = 1
858 };
859
860 /* stereo PCM selector */
861 enum {
862 MAD_PCM_CHANNEL_STEREO_LEFT = 0,
863 MAD_PCM_CHANNEL_STEREO_RIGHT = 1
864 };
865
866 void mad_synth_init(struct mad_synth *);
867
868 # define mad_synth_finish(synth) /* nothing */
869
870 void mad_synth_mute(struct mad_synth *);
871
872 void mad_synth_frame(struct mad_synth *, struct mad_frame const *);
873
874 # endif
875
876 /* Id: decoder.h,v 1.16 2003/05/27 22:40:36 rob Exp */
877
878 # ifndef LIBMAD_DECODER_H
879 # define LIBMAD_DECODER_H
880
881
882 enum mad_decoder_mode {
883 MAD_DECODER_MODE_SYNC = 0,
884 MAD_DECODER_MODE_ASYNC
885 };
886
887 enum mad_flow {
888 MAD_FLOW_CONTINUE = 0x0000, /* continue normally */
889 MAD_FLOW_STOP = 0x0010, /* stop decoding normally */
890 MAD_FLOW_BREAK = 0x0011, /* stop decoding and signal an error */
891 MAD_FLOW_IGNORE = 0x0020 /* ignore the current frame */
892 };
893
894 struct mad_decoder {
895 enum mad_decoder_mode mode;
896
897 int options;
898
899 struct {
900 long pid;
901 int in;
902 int out;
903 } async;
904
905 struct {
906 struct mad_stream stream;
907 struct mad_frame frame;
908 struct mad_synth synth;
909 } *sync;
910
911 void *cb_data;
912
913 enum mad_flow (*input_func)(void *, struct mad_stream *);
914 enum mad_flow (*header_func)(void *, struct mad_header const *);
915 enum mad_flow (*filter_func)(void *,
916 struct mad_stream const *, struct mad_frame *);
917 enum mad_flow (*output_func)(void *,
918 struct mad_header const *, struct mad_pcm *);
919 enum mad_flow (*error_func)(void *, struct mad_stream *, struct mad_frame *);
920 enum mad_flow (*message_func)(void *, void *, unsigned int *);
921 };
922
923 void mad_decoder_init(struct mad_decoder *, void *,
924 enum mad_flow (*)(void *, struct mad_stream *),
925 enum mad_flow (*)(void *, struct mad_header const *),
926 enum mad_flow (*)(void *,
927 struct mad_stream const *,
928 struct mad_frame *),
929 enum mad_flow (*)(void *,
930 struct mad_header const *,
931 struct mad_pcm *),
932 enum mad_flow (*)(void *,
933 struct mad_stream *,
934 struct mad_frame *),
935 enum mad_flow (*)(void *, void *, unsigned int *));
936 int mad_decoder_finish(struct mad_decoder *);
937
938 # define mad_decoder_options(decoder, opts) \
939 ((void) ((decoder)->options = (opts)))
940
941 int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
942 int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);
943
944 # endif
945
946 # ifdef __cplusplus
947 }
948 # endif
949