1 /*
2 * libmad - MPEG audio decoder library
3 * Copyright (C) 2000-2004 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 1.26 2004/01/23 09:41:33 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 1
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 "2000-2004"
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 1.38 2004/02/17 02:02:03 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 # define MAD_F(x) ((mad_fixed_t) (x##L))
120
121 # define MAD_F_MIN ((mad_fixed_t) -0x80000000L)
122 # define MAD_F_MAX ((mad_fixed_t) +0x7fffffffL)
123
124 # define MAD_F_ONE MAD_F(0x10000000)
125
126 # define mad_f_tofixed(x) ((mad_fixed_t) \
127 ((x) * (double) (1L << MAD_F_FRACBITS) + 0.5))
128 # define mad_f_todouble(x) ((double) \
129 ((x) / (double) (1L << MAD_F_FRACBITS)))
130
131 # define mad_f_intpart(x) ((x) >> MAD_F_FRACBITS)
132 # define mad_f_fracpart(x) ((x) & ((1L << MAD_F_FRACBITS) - 1))
133 /* (x should be positive) */
134
135 # define mad_f_fromint(x) ((x) << MAD_F_FRACBITS)
136
137 # define mad_f_add(x, y) ((x) + (y))
138 # define mad_f_sub(x, y) ((x) - (y))
139
140 # if defined(FPM_FLOAT)
141 # error "FPM_FLOAT not yet supported"
142
143 # undef MAD_F
144 # define MAD_F(x) mad_f_todouble(x)
145
146 # define mad_f_mul(x, y) ((x) * (y))
147 # define mad_f_scale64
148
149 # undef ASO_ZEROCHECK
150
151 # elif defined(FPM_64BIT)
152
153 /*
154 * This version should be the most accurate if 64-bit types are supported by
155 * the compiler, although it may not be the most efficient.
156 */
157 # if defined(OPT_ACCURACY)
158 # define mad_f_mul(x, y) \
159 ((mad_fixed_t) \
160 ((((mad_fixed64_t) (x) * (y)) + \
161 (1L << (MAD_F_SCALEBITS - 1))) >> MAD_F_SCALEBITS))
162 # else
163 # define mad_f_mul(x, y) \
164 ((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS))
165 # endif
166
167 # define MAD_F_SCALEBITS MAD_F_FRACBITS
168
169 /* --- Intel --------------------------------------------------------------- */
170
171 # elif defined(FPM_INTEL)
172
173 # if defined(_MSC_VER)
174 # pragma warning(push)
175 # pragma warning(disable: 4035) /* no return value */
176 static __forceinline
mad_f_mul_inline(mad_fixed_t x,mad_fixed_t y)177 mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y)
178 {
179 enum {
180 fracbits = MAD_F_FRACBITS
181 };
182
183 __asm {
184 mov eax, x
185 imul y
186 shrd eax, edx, fracbits
187 }
188
189 /* implicit return of eax */
190 }
191 # pragma warning(pop)
192
193 # define mad_f_mul mad_f_mul_inline
194 # define mad_f_scale64
195 # else
196 /*
197 * This Intel version is fast and accurate; the disposition of the least
198 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
199 */
200 # define MAD_F_MLX(hi, lo, x, y) \
201 asm ("imull %3" \
202 : "=a" (lo), "=d" (hi) \
203 : "%a" (x), "rm" (y) \
204 : "cc")
205
206 # if defined(OPT_ACCURACY)
207 /*
208 * This gives best accuracy but is not very fast.
209 */
210 # define MAD_F_MLA(hi, lo, x, y) \
211 ({ mad_fixed64hi_t __hi; \
212 mad_fixed64lo_t __lo; \
213 MAD_F_MLX(__hi, __lo, (x), (y)); \
214 asm ("addl %2,%0\n\t" \
215 "adcl %3,%1" \
216 : "=rm" (lo), "=rm" (hi) \
217 : "r" (__lo), "r" (__hi), "0" (lo), "1" (hi) \
218 : "cc"); \
219 })
220 # endif /* OPT_ACCURACY */
221
222 # if defined(OPT_ACCURACY)
223 /*
224 * Surprisingly, this is faster than SHRD followed by ADC.
225 */
226 # define mad_f_scale64(hi, lo) \
227 ({ mad_fixed64hi_t __hi_; \
228 mad_fixed64lo_t __lo_; \
229 mad_fixed_t __result; \
230 asm ("addl %4,%2\n\t" \
231 "adcl %5,%3" \
232 : "=rm" (__lo_), "=rm" (__hi_) \
233 : "0" (lo), "1" (hi), \
234 "ir" (1L << (MAD_F_SCALEBITS - 1)), "ir" (0) \
235 : "cc"); \
236 asm ("shrdl %3,%2,%1" \
237 : "=rm" (__result) \
238 : "0" (__lo_), "r" (__hi_), "I" (MAD_F_SCALEBITS) \
239 : "cc"); \
240 __result; \
241 })
242 # elif defined(OPT_INTEL)
243 /*
244 * Alternate Intel scaling that may or may not perform better.
245 */
246 # define mad_f_scale64(hi, lo) \
247 ({ mad_fixed_t __result; \
248 asm ("shrl %3,%1\n\t" \
249 "shll %4,%2\n\t" \
250 "orl %2,%1" \
251 : "=rm" (__result) \
252 : "0" (lo), "r" (hi), \
253 "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \
254 : "cc"); \
255 __result; \
256 })
257 # else
258 # define mad_f_scale64(hi, lo) \
259 ({ mad_fixed_t __result; \
260 asm ("shrdl %3,%2,%1" \
261 : "=rm" (__result) \
262 : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS) \
263 : "cc"); \
264 __result; \
265 })
266 # endif /* OPT_ACCURACY */
267
268 # define MAD_F_SCALEBITS MAD_F_FRACBITS
269 # endif
270
271 /* --- ARM ----------------------------------------------------------------- */
272
273 # elif defined(FPM_ARM)
274
275 /*
276 * This ARM V4 version is as accurate as FPM_64BIT but much faster. The
277 * least significant bit is properly rounded at no CPU cycle cost!
278 */
279 # if 1
280 /*
281 * This is faster than the default implementation via MAD_F_MLX() and
282 * mad_f_scale64().
283 */
284 # define mad_f_mul(x, y) \
285 ({ mad_fixed64hi_t __hi; \
286 mad_fixed64lo_t __lo; \
287 mad_fixed_t __result; \
288 asm ("smull %0, %1, %3, %4\n\t" \
289 "movs %0, %0, lsr %5\n\t" \
290 "adc %2, %0, %1, lsl %6" \
291 : "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
292 : "%r" (x), "r" (y), \
293 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
294 : "cc"); \
295 __result; \
296 })
297 # endif
298
299 # define MAD_F_MLX(hi, lo, x, y) \
300 asm ("smull %0, %1, %2, %3" \
301 : "=&r" (lo), "=&r" (hi) \
302 : "%r" (x), "r" (y))
303
304 # define MAD_F_MLA(hi, lo, x, y) \
305 asm ("smlal %0, %1, %2, %3" \
306 : "+r" (lo), "+r" (hi) \
307 : "%r" (x), "r" (y))
308
309 # define MAD_F_MLN(hi, lo) \
310 asm ("rsbs %0, %2, #0\n\t" \
311 "rsc %1, %3, #0" \
312 : "=r" (lo), "=r" (hi) \
313 : "0" (lo), "1" (hi) \
314 : "cc")
315
316 # define mad_f_scale64(hi, lo) \
317 ({ mad_fixed_t __result; \
318 asm ("movs %0, %1, lsr %3\n\t" \
319 "adc %0, %0, %2, lsl %4" \
320 : "=&r" (__result) \
321 : "r" (lo), "r" (hi), \
322 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
323 : "cc"); \
324 __result; \
325 })
326
327 # define MAD_F_SCALEBITS MAD_F_FRACBITS
328
329 /* --- MIPS ---------------------------------------------------------------- */
330
331 # elif defined(FPM_MIPS)
332
333 /*
334 * This MIPS version is fast and accurate; the disposition of the least
335 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
336 */
337 # define MAD_F_MLX(hi, lo, x, y) \
338 asm ("mult %2,%3" \
339 : "=l" (lo), "=h" (hi) \
340 : "%r" (x), "r" (y))
341
342 # if defined(HAVE_MADD_ASM)
343 # define MAD_F_MLA(hi, lo, x, y) \
344 asm ("madd %2,%3" \
345 : "+l" (lo), "+h" (hi) \
346 : "%r" (x), "r" (y))
347 # elif defined(HAVE_MADD16_ASM)
348 /*
349 * This loses significant accuracy due to the 16-bit integer limit in the
350 * multiply/accumulate instruction.
351 */
352 # define MAD_F_ML0(hi, lo, x, y) \
353 asm ("mult %2,%3" \
354 : "=l" (lo), "=h" (hi) \
355 : "%r" ((x) >> 12), "r" ((y) >> 16))
356 # define MAD_F_MLA(hi, lo, x, y) \
357 asm ("madd16 %2,%3" \
358 : "+l" (lo), "+h" (hi) \
359 : "%r" ((x) >> 12), "r" ((y) >> 16))
360 # define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo))
361 # endif
362
363 # if defined(OPT_SPEED)
364 # define mad_f_scale64(hi, lo) \
365 ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS)))
366 # define MAD_F_SCALEBITS MAD_F_FRACBITS
367 # endif
368
369 /* --- SPARC --------------------------------------------------------------- */
370
371 # elif defined(FPM_SPARC)
372
373 /*
374 * This SPARC V8 version is fast and accurate; the disposition of the least
375 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
376 */
377 # define MAD_F_MLX(hi, lo, x, y) \
378 asm ("smul %2, %3, %0\n\t" \
379 "rd %%y, %1" \
380 : "=r" (lo), "=r" (hi) \
381 : "%r" (x), "rI" (y))
382
383 /* --- PowerPC ------------------------------------------------------------- */
384
385 # elif defined(FPM_PPC)
386
387 /*
388 * This PowerPC version is fast and accurate; the disposition of the least
389 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
390 */
391 # define MAD_F_MLX(hi, lo, x, y) \
392 do { \
393 asm ("mullw %0,%1,%2" \
394 : "=r" (lo) \
395 : "%r" (x), "r" (y)); \
396 asm ("mulhw %0,%1,%2" \
397 : "=r" (hi) \
398 : "%r" (x), "r" (y)); \
399 } \
400 while (0)
401
402 # if defined(OPT_ACCURACY)
403 /*
404 * This gives best accuracy but is not very fast.
405 */
406 # define MAD_F_MLA(hi, lo, x, y) \
407 ({ mad_fixed64hi_t __hi; \
408 mad_fixed64lo_t __lo; \
409 MAD_F_MLX(__hi, __lo, (x), (y)); \
410 asm ("addc %0,%2,%3\n\t" \
411 "adde %1,%4,%5" \
412 : "=r" (lo), "=r" (hi) \
413 : "%r" (lo), "r" (__lo), \
414 "%r" (hi), "r" (__hi) \
415 : "xer"); \
416 })
417 # endif
418
419 # if defined(OPT_ACCURACY)
420 /*
421 * This is slower than the truncating version below it.
422 */
423 # define mad_f_scale64(hi, lo) \
424 ({ mad_fixed_t __result, __round; \
425 asm ("rotrwi %0,%1,%2" \
426 : "=r" (__result) \
427 : "r" (lo), "i" (MAD_F_SCALEBITS)); \
428 asm ("extrwi %0,%1,1,0" \
429 : "=r" (__round) \
430 : "r" (__result)); \
431 asm ("insrwi %0,%1,%2,0" \
432 : "+r" (__result) \
433 : "r" (hi), "i" (MAD_F_SCALEBITS)); \
434 asm ("add %0,%1,%2" \
435 : "=r" (__result) \
436 : "%r" (__result), "r" (__round)); \
437 __result; \
438 })
439 # else
440 # define mad_f_scale64(hi, lo) \
441 ({ mad_fixed_t __result; \
442 asm ("rotrwi %0,%1,%2" \
443 : "=r" (__result) \
444 : "r" (lo), "i" (MAD_F_SCALEBITS)); \
445 asm ("insrwi %0,%1,%2,0" \
446 : "+r" (__result) \
447 : "r" (hi), "i" (MAD_F_SCALEBITS)); \
448 __result; \
449 })
450 # endif
451
452 # define MAD_F_SCALEBITS MAD_F_FRACBITS
453
454 /* --- Default ------------------------------------------------------------- */
455
456 # elif defined(FPM_DEFAULT)
457
458 /*
459 * This version is the most portable but it loses significant accuracy.
460 * Furthermore, accuracy is biased against the second argument, so care
461 * should be taken when ordering operands.
462 *
463 * The scale factors are constant as this is not used with SSO.
464 *
465 * Pre-rounding is required to stay within the limits of compliance.
466 */
467 # if defined(OPT_SPEED)
468 # define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16))
469 # else
470 # define mad_f_mul(x, y) ((((x) + (1L << 11)) >> 12) * \
471 (((y) + (1L << 15)) >> 16))
472 # endif
473
474 /* ------------------------------------------------------------------------- */
475
476 # else
477 # error "no FPM selected"
478 # endif
479
480 /* default implementations */
481
482 # if !defined(mad_f_mul)
483 # define mad_f_mul(x, y) \
484 ({ register mad_fixed64hi_t __hi; \
485 register mad_fixed64lo_t __lo; \
486 MAD_F_MLX(__hi, __lo, (x), (y)); \
487 mad_f_scale64(__hi, __lo); \
488 })
489 # endif
490
491 # if !defined(MAD_F_MLA)
492 # define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y)))
493 # define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y)))
494 # define MAD_F_MLN(hi, lo) ((lo) = -(lo))
495 # define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo))
496 # endif
497
498 # if !defined(MAD_F_ML0)
499 # define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y))
500 # endif
501
502 # if !defined(MAD_F_MLN)
503 # define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi))
504 # endif
505
506 # if !defined(MAD_F_MLZ)
507 # define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo))
508 # endif
509
510 # if !defined(mad_f_scale64)
511 # if defined(OPT_ACCURACY)
512 # define mad_f_scale64(hi, lo) \
513 ((((mad_fixed_t) \
514 (((hi) << (32 - (MAD_F_SCALEBITS - 1))) | \
515 ((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1)
516 # else
517 # define mad_f_scale64(hi, lo) \
518 ((mad_fixed_t) \
519 (((hi) << (32 - MAD_F_SCALEBITS)) | \
520 ((lo) >> MAD_F_SCALEBITS)))
521 # endif
522 # define MAD_F_SCALEBITS MAD_F_FRACBITS
523 # endif
524
525 /* C routines */
526
527 mad_fixed_t mad_f_abs(mad_fixed_t);
528 mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t);
529
530 # endif
531
532 /* Id: bit.h,v 1.12 2004/01/23 09:41:32 rob Exp */
533
534 # ifndef LIBMAD_BIT_H
535 # define LIBMAD_BIT_H
536
537 struct mad_bitptr {
538 unsigned char const *byte;
539 unsigned short cache;
540 unsigned short left;
541 };
542
543 void mad_bit_init(struct mad_bitptr *, unsigned char const *);
544
545 # define mad_bit_finish(bitptr) /* nothing */
546
547 unsigned int mad_bit_length(struct mad_bitptr const *,
548 struct mad_bitptr const *);
549
550 # define mad_bit_bitsleft(bitptr) ((bitptr)->left)
551 unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *);
552
553 void mad_bit_skip(struct mad_bitptr *, unsigned int);
554 unsigned long mad_bit_read(struct mad_bitptr *, unsigned int);
555 void mad_bit_write(struct mad_bitptr *, unsigned int, unsigned long);
556
557 unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short);
558
559 # endif
560
561 /* Id: timer.h,v 1.16 2004/01/23 09:41:33 rob Exp */
562
563 # ifndef LIBMAD_TIMER_H
564 # define LIBMAD_TIMER_H
565
566 typedef struct {
567 signed long seconds; /* whole seconds */
568 unsigned long fraction; /* 1/MAD_TIMER_RESOLUTION seconds */
569 } mad_timer_t;
570
571 extern mad_timer_t const mad_timer_zero;
572
573 # define MAD_TIMER_RESOLUTION 352800000UL
574
575 enum mad_units {
576 MAD_UNITS_HOURS = -2,
577 MAD_UNITS_MINUTES = -1,
578 MAD_UNITS_SECONDS = 0,
579
580 /* metric units */
581
582 MAD_UNITS_DECISECONDS = 10,
583 MAD_UNITS_CENTISECONDS = 100,
584 MAD_UNITS_MILLISECONDS = 1000,
585
586 /* audio sample units */
587
588 MAD_UNITS_8000_HZ = 8000,
589 MAD_UNITS_11025_HZ = 11025,
590 MAD_UNITS_12000_HZ = 12000,
591
592 MAD_UNITS_16000_HZ = 16000,
593 MAD_UNITS_22050_HZ = 22050,
594 MAD_UNITS_24000_HZ = 24000,
595
596 MAD_UNITS_32000_HZ = 32000,
597 MAD_UNITS_44100_HZ = 44100,
598 MAD_UNITS_48000_HZ = 48000,
599
600 /* video frame/field units */
601
602 MAD_UNITS_24_FPS = 24,
603 MAD_UNITS_25_FPS = 25,
604 MAD_UNITS_30_FPS = 30,
605 MAD_UNITS_48_FPS = 48,
606 MAD_UNITS_50_FPS = 50,
607 MAD_UNITS_60_FPS = 60,
608
609 /* CD audio frames */
610
611 MAD_UNITS_75_FPS = 75,
612
613 /* video drop-frame units */
614
615 MAD_UNITS_23_976_FPS = -24,
616 MAD_UNITS_24_975_FPS = -25,
617 MAD_UNITS_29_97_FPS = -30,
618 MAD_UNITS_47_952_FPS = -48,
619 MAD_UNITS_49_95_FPS = -50,
620 MAD_UNITS_59_94_FPS = -60
621 };
622
623 # define mad_timer_reset(timer) ((void) (*(timer) = mad_timer_zero))
624
625 int mad_timer_compare(mad_timer_t, mad_timer_t);
626
627 # define mad_timer_sign(timer) mad_timer_compare((timer), mad_timer_zero)
628
629 void mad_timer_negate(mad_timer_t *);
630 mad_timer_t mad_timer_abs(mad_timer_t);
631
632 void mad_timer_set(mad_timer_t *, unsigned long, unsigned long, unsigned long);
633 void mad_timer_add(mad_timer_t *, mad_timer_t);
634 void mad_timer_multiply(mad_timer_t *, signed long);
635
636 signed long mad_timer_count(mad_timer_t, enum mad_units);
637 unsigned long mad_timer_fraction(mad_timer_t, unsigned long);
638 void mad_timer_string(mad_timer_t, char *, char const *,
639 enum mad_units, enum mad_units, unsigned long);
640
641 # endif
642
643 /* Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp */
644
645 # ifndef LIBMAD_STREAM_H
646 # define LIBMAD_STREAM_H
647
648
649 # define MAD_BUFFER_GUARD 8
650 # define MAD_BUFFER_MDLEN (511 + 2048 + MAD_BUFFER_GUARD)
651
652 enum mad_error {
653 MAD_ERROR_NONE = 0x0000, /* no error */
654
655 MAD_ERROR_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
656 MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
657
658 MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
659
660 MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
661 MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
662 MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
663 MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
664 MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
665
666 MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
667 MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
668 MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
669 MAD_ERROR_BADMODE = 0x0222, /* bad bitrate/mode combination */
670 MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
671 MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
672 MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
673 MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
674 MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
675 MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
676 MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
677 MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
678 MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
679 };
680
681 # define MAD_RECOVERABLE(error) ((error) & 0xff00)
682
683 struct mad_stream {
684 unsigned char const *buffer; /* input bitstream buffer */
685 unsigned char const *bufend; /* end of buffer */
686 unsigned long skiplen; /* bytes to skip before next frame */
687
688 int sync; /* stream sync found */
689 unsigned long freerate; /* free bitrate (fixed) */
690
691 unsigned char const *this_frame; /* start of current frame */
692 unsigned char const *next_frame; /* start of next frame */
693 struct mad_bitptr ptr; /* current processing bit pointer */
694
695 struct mad_bitptr anc_ptr; /* ancillary bits pointer */
696 unsigned int anc_bitlen; /* number of ancillary bits */
697
698 unsigned char (*main_data)[MAD_BUFFER_MDLEN];
699 /* Layer III main_data() */
700 unsigned int md_len; /* bytes in main_data */
701
702 int options; /* decoding options (see below) */
703 enum mad_error error; /* error code (see above) */
704 };
705
706 enum {
707 MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
708 MAD_OPTION_HALFSAMPLERATE = 0x0002 /* generate PCM at 1/2 sample rate */
709 # if 0 /* not yet implemented */
710 MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
711 MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
712 MAD_OPTION_SINGLECHANNEL = 0x0030 /* combine channels */
713 # endif
714 };
715
716 void mad_stream_init(struct mad_stream *);
717 void mad_stream_finish(struct mad_stream *);
718
719 # define mad_stream_options(stream, opts) \
720 ((void) ((stream)->options = (opts)))
721
722 void mad_stream_buffer(struct mad_stream *,
723 unsigned char const *, unsigned long);
724 void mad_stream_skip(struct mad_stream *, unsigned long);
725
726 int mad_stream_sync(struct mad_stream *);
727
728 char const *mad_stream_errorstr(struct mad_stream const *);
729
730 # endif
731
732 /* Id: frame.h,v 1.20 2004/01/23 09:41:32 rob Exp */
733
734 # ifndef LIBMAD_FRAME_H
735 # define LIBMAD_FRAME_H
736
737
738 enum mad_layer {
739 MAD_LAYER_I = 1, /* Layer I */
740 MAD_LAYER_II = 2, /* Layer II */
741 MAD_LAYER_III = 3 /* Layer III */
742 };
743
744 enum mad_mode {
745 MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */
746 MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */
747 MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */
748 MAD_MODE_STEREO = 3 /* normal LR stereo */
749 };
750
751 enum mad_emphasis {
752 MAD_EMPHASIS_NONE = 0, /* no emphasis */
753 MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */
754 MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */
755 MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */
756 };
757
758 struct mad_header {
759 enum mad_layer layer; /* audio layer (1, 2, or 3) */
760 enum mad_mode mode; /* channel mode (see above) */
761 int mode_extension; /* additional mode info */
762 enum mad_emphasis emphasis; /* de-emphasis to use (see above) */
763
764 unsigned long bitrate; /* stream bitrate (bps) */
765 unsigned int samplerate; /* sampling frequency (Hz) */
766
767 unsigned short crc_check; /* frame CRC accumulator */
768 unsigned short crc_target; /* final target CRC checksum */
769
770 int flags; /* flags (see below) */
771 int private_bits; /* private bits (see below) */
772
773 mad_timer_t duration; /* audio playing time of frame */
774 };
775
776 struct mad_frame {
777 struct mad_header header; /* MPEG audio header */
778
779 int options; /* decoding options (from stream) */
780
781 mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
782 mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
783 };
784
785 # define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)
786 # define MAD_NSBSAMPLES(header) \
787 ((header)->layer == MAD_LAYER_I ? 12 : \
788 (((header)->layer == MAD_LAYER_III && \
789 ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
790
791 enum {
792 MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */
793 MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */
794
795 MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */
796 MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */
797 MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */
798 MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */
799
800 MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */
801 MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */
802 MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */
803
804 MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */
805 MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */
806 MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */
807 };
808
809 enum {
810 MAD_PRIVATE_HEADER = 0x0100, /* header private bit */
811 MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */
812 };
813
814 void mad_header_init(struct mad_header *);
815
816 # define mad_header_finish(header) /* nothing */
817
818 int mad_header_decode(struct mad_header *, struct mad_stream *);
819
820 void mad_frame_init(struct mad_frame *);
821 void mad_frame_finish(struct mad_frame *);
822
823 int mad_frame_decode(struct mad_frame *, struct mad_stream *);
824
825 void mad_frame_mute(struct mad_frame *);
826
827 # endif
828
829 /* Id: synth.h,v 1.15 2004/01/23 09:41:33 rob Exp */
830
831 # ifndef LIBMAD_SYNTH_H
832 # define LIBMAD_SYNTH_H
833
834
835 struct mad_pcm {
836 unsigned int samplerate; /* sampling frequency (Hz) */
837 unsigned short channels; /* number of channels */
838 unsigned short length; /* number of samples per channel */
839 mad_fixed_t samples[2][1152]; /* PCM output samples [ch][sample] */
840 };
841
842 struct mad_synth {
843 mad_fixed_t filter[2][2][2][16][8]; /* polyphase filterbank outputs */
844 /* [ch][eo][peo][s][v] */
845
846 unsigned int phase; /* current processing phase */
847
848 struct mad_pcm pcm; /* PCM output */
849 };
850
851 /* single channel PCM selector */
852 enum {
853 MAD_PCM_CHANNEL_SINGLE = 0
854 };
855
856 /* dual channel PCM selector */
857 enum {
858 MAD_PCM_CHANNEL_DUAL_1 = 0,
859 MAD_PCM_CHANNEL_DUAL_2 = 1
860 };
861
862 /* stereo PCM selector */
863 enum {
864 MAD_PCM_CHANNEL_STEREO_LEFT = 0,
865 MAD_PCM_CHANNEL_STEREO_RIGHT = 1
866 };
867
868 void mad_synth_init(struct mad_synth *);
869
870 # define mad_synth_finish(synth) /* nothing */
871
872 void mad_synth_mute(struct mad_synth *);
873
874 void mad_synth_frame(struct mad_synth *, struct mad_frame const *);
875
876 # endif
877
878 /* Id: decoder.h,v 1.17 2004/01/23 09:41:32 rob Exp */
879
880 # ifndef LIBMAD_DECODER_H
881 # define LIBMAD_DECODER_H
882
883
884 enum mad_decoder_mode {
885 MAD_DECODER_MODE_SYNC = 0,
886 MAD_DECODER_MODE_ASYNC
887 };
888
889 enum mad_flow {
890 MAD_FLOW_CONTINUE = 0x0000, /* continue normally */
891 MAD_FLOW_STOP = 0x0010, /* stop decoding normally */
892 MAD_FLOW_BREAK = 0x0011, /* stop decoding and signal an error */
893 MAD_FLOW_IGNORE = 0x0020 /* ignore the current frame */
894 };
895
896 struct mad_decoder {
897 enum mad_decoder_mode mode;
898
899 int options;
900
901 struct {
902 long pid;
903 int in;
904 int out;
905 } async;
906
907 struct {
908 struct mad_stream stream;
909 struct mad_frame frame;
910 struct mad_synth synth;
911 } *sync;
912
913 void *cb_data;
914
915 enum mad_flow (*input_func)(void *, struct mad_stream *);
916 enum mad_flow (*header_func)(void *, struct mad_header const *);
917 enum mad_flow (*filter_func)(void *,
918 struct mad_stream const *, struct mad_frame *);
919 enum mad_flow (*output_func)(void *,
920 struct mad_header const *, struct mad_pcm *);
921 enum mad_flow (*error_func)(void *, struct mad_stream *, struct mad_frame *);
922 enum mad_flow (*message_func)(void *, void *, unsigned int *);
923 };
924
925 void mad_decoder_init(struct mad_decoder *, void *,
926 enum mad_flow (*)(void *, struct mad_stream *),
927 enum mad_flow (*)(void *, struct mad_header const *),
928 enum mad_flow (*)(void *,
929 struct mad_stream const *,
930 struct mad_frame *),
931 enum mad_flow (*)(void *,
932 struct mad_header const *,
933 struct mad_pcm *),
934 enum mad_flow (*)(void *,
935 struct mad_stream *,
936 struct mad_frame *),
937 enum mad_flow (*)(void *, void *, unsigned int *));
938 int mad_decoder_finish(struct mad_decoder *);
939
940 # define mad_decoder_options(decoder, opts) \
941 ((void) ((decoder)->options = (opts)))
942
943 int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
944 int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);
945
946 # endif
947
948 # ifdef __cplusplus
949 }
950 # endif
951