summaryrefslogtreecommitdiff
path: root/audio_codec/libmad/mad.h (plain)
blob: c7d373a8f485e362858c9bf76827da11a5991457
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
24extern "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# 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
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# elif defined(OPT_INTEL)
257 /*
258 * Alternate Intel scaling that may or may not perform better.
259 */
260# define mad_f_scale64(hi, lo) \
261 ({ mad_fixed_t __result; \
262 asm ("shrl %3,%1\n\t" \
263 "shll %4,%2\n\t" \
264 "orl %2,%1" \
265 : "=rm" (__result) \
266 : "0" (lo), "r" (hi), \
267 "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \
268 : "cc"); \
269 __result; \
270 })
271# else
272# define mad_f_scale64(hi, lo) \
273 ({ mad_fixed_t __result; \
274 asm ("shrdl %3,%2,%1" \
275 : "=rm" (__result) \
276 : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS) \
277 : "cc"); \
278 __result; \
279 })
280# endif /* OPT_ACCURACY */
281
282# define MAD_F_SCALEBITS MAD_F_FRACBITS
283# endif
284
285 /* --- ARM ----------------------------------------------------------------- */
286
287# elif defined(FPM_ARM)
288
289 /*
290 * This ARM V4 version is as accurate as FPM_64BIT but much faster. The
291 * least significant bit is properly rounded at no CPU cycle cost!
292 */
293# if 1
294 /*
295 * This is faster than the default implementation via MAD_F_MLX() and
296 * mad_f_scale64().
297 */
298# define mad_f_mul(x, y) \
299 ({ mad_fixed64hi_t __hi; \
300 mad_fixed64lo_t __lo; \
301 mad_fixed_t __result; \
302 asm ("smull %0, %1, %3, %4\n\t" \
303 "movs %0, %0, lsr %5\n\t" \
304 "adc %2, %0, %1, lsl %6" \
305 : "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
306 : "%r" (x), "r" (y), \
307 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
308 : "cc"); \
309 __result; \
310 })
311# endif
312
313# define MAD_F_MLX(hi, lo, x, y) \
314 asm ("smull %0, %1, %2, %3" \
315 : "=&r" (lo), "=&r" (hi) \
316 : "%r" (x), "r" (y))
317
318# define MAD_F_MLA(hi, lo, x, y) \
319 asm ("smlal %0, %1, %2, %3" \
320 : "+r" (lo), "+r" (hi) \
321 : "%r" (x), "r" (y))
322
323# define MAD_F_MLN(hi, lo) \
324 asm ("rsbs %0, %2, #0\n\t" \
325 "rsc %1, %3, #0" \
326 : "=r" (lo), "=r" (hi) \
327 : "0" (lo), "1" (hi) \
328 : "cc")
329
330# define mad_f_scale64(hi, lo) \
331 ({ mad_fixed_t __result; \
332 asm ("movs %0, %1, lsr %3\n\t" \
333 "adc %0, %0, %2, lsl %4" \
334 : "=&r" (__result) \
335 : "r" (lo), "r" (hi), \
336 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
337 : "cc"); \
338 __result; \
339 })
340
341# define MAD_F_SCALEBITS MAD_F_FRACBITS
342
343 /* --- MIPS ---------------------------------------------------------------- */
344
345# elif defined(FPM_MIPS)
346
347 /*
348 * This MIPS version is fast and accurate; the disposition of the least
349 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
350 */
351# define MAD_F_MLX(hi, lo, x, y) \
352 asm ("mult %2,%3" \
353 : "=l" (lo), "=h" (hi) \
354 : "%r" (x), "r" (y))
355
356# if defined(HAVE_MADD_ASM)
357# define MAD_F_MLA(hi, lo, x, y) \
358 asm ("madd %2,%3" \
359 : "+l" (lo), "+h" (hi) \
360 : "%r" (x), "r" (y))
361# elif defined(HAVE_MADD16_ASM)
362 /*
363 * This loses significant accuracy due to the 16-bit integer limit in the
364 * multiply/accumulate instruction.
365 */
366# define MAD_F_ML0(hi, lo, x, y) \
367 asm ("mult %2,%3" \
368 : "=l" (lo), "=h" (hi) \
369 : "%r" ((x) >> 12), "r" ((y) >> 16))
370# define MAD_F_MLA(hi, lo, x, y) \
371 asm ("madd16 %2,%3" \
372 : "+l" (lo), "+h" (hi) \
373 : "%r" ((x) >> 12), "r" ((y) >> 16))
374# define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo))
375# endif
376
377# if defined(OPT_SPEED)
378# define mad_f_scale64(hi, lo) \
379 ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS)))
380# define MAD_F_SCALEBITS MAD_F_FRACBITS
381# endif
382
383 /* --- SPARC --------------------------------------------------------------- */
384
385# elif defined(FPM_SPARC)
386
387 /*
388 * This SPARC V8 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 asm ("smul %2, %3, %0\n\t" \
393 "rd %%y, %1" \
394 : "=r" (lo), "=r" (hi) \
395 : "%r" (x), "rI" (y))
396
397 /* --- PowerPC ------------------------------------------------------------- */
398
399# elif defined(FPM_PPC)
400
401 /*
402 * This PowerPC version is fast and accurate; the disposition of the least
403 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
404 */
405# define MAD_F_MLX(hi, lo, x, y) \
406 do { \
407 asm ("mullw %0,%1,%2" \
408 : "=r" (lo) \
409 : "%r" (x), "r" (y)); \
410 asm ("mulhw %0,%1,%2" \
411 : "=r" (hi) \
412 : "%r" (x), "r" (y)); \
413 } \
414 while (0)
415
416# if defined(OPT_ACCURACY)
417 /*
418 * This gives best accuracy but is not very fast.
419 */
420# define MAD_F_MLA(hi, lo, x, y) \
421 ({ mad_fixed64hi_t __hi; \
422 mad_fixed64lo_t __lo; \
423 MAD_F_MLX(__hi, __lo, (x), (y)); \
424 asm ("addc %0,%2,%3\n\t" \
425 "adde %1,%4,%5" \
426 : "=r" (lo), "=r" (hi) \
427 : "%r" (lo), "r" (__lo), \
428 "%r" (hi), "r" (__hi) \
429 : "xer"); \
430 })
431# endif
432
433# if defined(OPT_ACCURACY)
434 /*
435 * This is slower than the truncating version below it.
436 */
437# define mad_f_scale64(hi, lo) \
438 ({ mad_fixed_t __result, __round; \
439 asm ("rotrwi %0,%1,%2" \
440 : "=r" (__result) \
441 : "r" (lo), "i" (MAD_F_SCALEBITS)); \
442 asm ("extrwi %0,%1,1,0" \
443 : "=r" (__round) \
444 : "r" (__result)); \
445 asm ("insrwi %0,%1,%2,0" \
446 : "+r" (__result) \
447 : "r" (hi), "i" (MAD_F_SCALEBITS)); \
448 asm ("add %0,%1,%2" \
449 : "=r" (__result) \
450 : "%r" (__result), "r" (__round)); \
451 __result; \
452 })
453# else
454# define mad_f_scale64(hi, lo) \
455 ({ mad_fixed_t __result; \
456 asm ("rotrwi %0,%1,%2" \
457 : "=r" (__result) \
458 : "r" (lo), "i" (MAD_F_SCALEBITS)); \
459 asm ("insrwi %0,%1,%2,0" \
460 : "+r" (__result) \
461 : "r" (hi), "i" (MAD_F_SCALEBITS)); \
462 __result; \
463 })
464# endif
465
466# define MAD_F_SCALEBITS MAD_F_FRACBITS
467
468 /* --- Default ------------------------------------------------------------- */
469
470# elif defined(FPM_DEFAULT)
471
472 /*
473 * This version is the most portable but it loses significant accuracy.
474 * Furthermore, accuracy is biased against the second argument, so care
475 * should be taken when ordering operands.
476 *
477 * The scale factors are constant as this is not used with SSO.
478 *
479 * Pre-rounding is required to stay within the limits of compliance.
480 */
481# if defined(OPT_SPEED)
482# define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16))
483# else
484# define mad_f_mul(x, y) ((((x) + (1L << 11)) >> 12) * \
485 (((y) + (1L << 15)) >> 16))
486# endif
487
488 /* ------------------------------------------------------------------------- */
489
490# else
491# error "no FPM selected"
492# endif
493
494 /* default implementations */
495
496# if !defined(mad_f_mul)
497# define mad_f_mul(x, y) \
498 ({ register mad_fixed64hi_t __hi; \
499 register mad_fixed64lo_t __lo; \
500 MAD_F_MLX(__hi, __lo, (x), (y)); \
501 mad_f_scale64(__hi, __lo); \
502 })
503# endif
504
505# if !defined(MAD_F_MLA)
506# define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y)))
507# define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y)))
508# define MAD_F_MLN(hi, lo) ((lo) = -(lo))
509# define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo))
510# endif
511
512# if !defined(MAD_F_ML0)
513# define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y))
514# endif
515
516# if !defined(MAD_F_MLN)
517# define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi))
518# endif
519
520# if !defined(MAD_F_MLZ)
521# define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo))
522# endif
523
524# if !defined(mad_f_scale64)
525# if defined(OPT_ACCURACY)
526# define mad_f_scale64(hi, lo) \
527 ((((mad_fixed_t) \
528 (((hi) << (32 - (MAD_F_SCALEBITS - 1))) | \
529 ((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1)
530# else
531# define mad_f_scale64(hi, lo) \
532 ((mad_fixed_t) \
533 (((hi) << (32 - MAD_F_SCALEBITS)) | \
534 ((lo) >> MAD_F_SCALEBITS)))
535# endif
536# define MAD_F_SCALEBITS MAD_F_FRACBITS
537# endif
538
539 /* C routines */
540
541 mad_fixed_t mad_f_abs(mad_fixed_t);
542 mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t);
543
544# endif
545
546 /* Id: bit.h,v 1.12 2004/01/23 09:41:32 rob Exp */
547
548# ifndef LIBMAD_BIT_H
549# define LIBMAD_BIT_H
550
551 struct mad_bitptr {
552 unsigned char const *byte;
553 unsigned short cache;
554 unsigned short left;
555 };
556
557 void mad_bit_init(struct mad_bitptr *, unsigned char const *);
558
559# define mad_bit_finish(bitptr) /* nothing */
560
561 unsigned int mad_bit_length(struct mad_bitptr const *,
562 struct mad_bitptr const *);
563
564# define mad_bit_bitsleft(bitptr) ((bitptr)->left)
565 unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *);
566
567 void mad_bit_skip(struct mad_bitptr *, unsigned int);
568 unsigned long mad_bit_read(struct mad_bitptr *, unsigned int);
569 void mad_bit_write(struct mad_bitptr *, unsigned int, unsigned long);
570
571 unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short);
572
573# endif
574
575 /* Id: timer.h,v 1.16 2004/01/23 09:41:33 rob Exp */
576
577# ifndef LIBMAD_TIMER_H
578# define LIBMAD_TIMER_H
579
580 typedef struct {
581 signed long seconds; /* whole seconds */
582 unsigned long fraction; /* 1/MAD_TIMER_RESOLUTION seconds */
583 } mad_timer_t;
584
585 extern mad_timer_t const mad_timer_zero;
586
587# define MAD_TIMER_RESOLUTION 352800000UL
588
589 enum mad_units {
590 MAD_UNITS_HOURS = -2,
591 MAD_UNITS_MINUTES = -1,
592 MAD_UNITS_SECONDS = 0,
593
594 /* metric units */
595
596 MAD_UNITS_DECISECONDS = 10,
597 MAD_UNITS_CENTISECONDS = 100,
598 MAD_UNITS_MILLISECONDS = 1000,
599
600 /* audio sample units */
601
602 MAD_UNITS_8000_HZ = 8000,
603 MAD_UNITS_11025_HZ = 11025,
604 MAD_UNITS_12000_HZ = 12000,
605
606 MAD_UNITS_16000_HZ = 16000,
607 MAD_UNITS_22050_HZ = 22050,
608 MAD_UNITS_24000_HZ = 24000,
609
610 MAD_UNITS_32000_HZ = 32000,
611 MAD_UNITS_44100_HZ = 44100,
612 MAD_UNITS_48000_HZ = 48000,
613
614 /* video frame/field units */
615
616 MAD_UNITS_24_FPS = 24,
617 MAD_UNITS_25_FPS = 25,
618 MAD_UNITS_30_FPS = 30,
619 MAD_UNITS_48_FPS = 48,
620 MAD_UNITS_50_FPS = 50,
621 MAD_UNITS_60_FPS = 60,
622
623 /* CD audio frames */
624
625 MAD_UNITS_75_FPS = 75,
626
627 /* video drop-frame units */
628
629 MAD_UNITS_23_976_FPS = -24,
630 MAD_UNITS_24_975_FPS = -25,
631 MAD_UNITS_29_97_FPS = -30,
632 MAD_UNITS_47_952_FPS = -48,
633 MAD_UNITS_49_95_FPS = -50,
634 MAD_UNITS_59_94_FPS = -60
635 };
636
637# define mad_timer_reset(timer) ((void) (*(timer) = mad_timer_zero))
638
639 int mad_timer_compare(mad_timer_t, mad_timer_t);
640
641# define mad_timer_sign(timer) mad_timer_compare((timer), mad_timer_zero)
642
643 void mad_timer_negate(mad_timer_t *);
644 mad_timer_t mad_timer_abs(mad_timer_t);
645
646 void mad_timer_set(mad_timer_t *, unsigned long, unsigned long, unsigned long);
647 void mad_timer_add(mad_timer_t *, mad_timer_t);
648 void mad_timer_multiply(mad_timer_t *, signed long);
649
650 signed long mad_timer_count(mad_timer_t, enum mad_units);
651 unsigned long mad_timer_fraction(mad_timer_t, unsigned long);
652 void mad_timer_string(mad_timer_t, char *, char const *,
653 enum mad_units, enum mad_units, unsigned long);
654
655# endif
656
657 /* Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp */
658
659# ifndef LIBMAD_STREAM_H
660# define LIBMAD_STREAM_H
661
662
663# define MAD_BUFFER_GUARD 8
664# define MAD_BUFFER_MDLEN (511 + 2048 + MAD_BUFFER_GUARD)
665
666 enum mad_error {
667 MAD_ERROR_NONE = 0x0000, /* no error */
668
669 MAD_ERROR_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
670 MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
671
672 MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
673
674 MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
675 MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
676 MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
677 MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
678 MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
679
680 MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
681 MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
682 MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
683 MAD_ERROR_BADMODE = 0x0222, /* bad bitrate/mode combination */
684 MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
685 MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
686 MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
687 MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
688 MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
689 MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
690 MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
691 MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
692 MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
693 };
694
695# define MAD_RECOVERABLE(error) ((error) & 0xff00)
696
697 struct mad_stream {
698 unsigned char const *buffer; /* input bitstream buffer */
699 unsigned char const *bufend; /* end of buffer */
700 unsigned long skiplen; /* bytes to skip before next frame */
701
702 int sync; /* stream sync found */
703 unsigned long freerate; /* free bitrate (fixed) */
704
705 unsigned char const *this_frame; /* start of current frame */
706 unsigned char const *next_frame; /* start of next frame */
707 struct mad_bitptr ptr; /* current processing bit pointer */
708
709 struct mad_bitptr anc_ptr; /* ancillary bits pointer */
710 unsigned int anc_bitlen; /* number of ancillary bits */
711
712 unsigned char(*main_data)[MAD_BUFFER_MDLEN];
713 /* Layer III main_data() */
714 unsigned int md_len; /* bytes in main_data */
715
716 int options; /* decoding options (see below) */
717 enum mad_error error; /* error code (see above) */
718 unsigned int muted_samples;
719 unsigned int muted_count;
720 };
721
722 enum {
723 MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
724 MAD_OPTION_HALFSAMPLERATE = 0x0002 /* generate PCM at 1/2 sample rate */
725# if 0 /* not yet implemented */
726 MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
727 MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
728 MAD_OPTION_SINGLECHANNEL = 0x0030 /* combine channels */
729# endif
730 };
731
732 void mad_stream_init(struct mad_stream *);
733 void mad_stream_finish(struct mad_stream *);
734
735# define mad_stream_options(stream, opts) \
736 ((void) ((stream)->options = (opts)))
737
738 void mad_stream_buffer(struct mad_stream *,
739 unsigned char const *, unsigned long);
740 void mad_stream_skip(struct mad_stream *, unsigned long);
741
742 int mad_stream_sync(struct mad_stream *);
743
744 char const *mad_stream_errorstr(struct mad_stream const *);
745
746# endif
747
748 /* Id: frame.h,v 1.20 2004/01/23 09:41:32 rob Exp */
749
750# ifndef LIBMAD_FRAME_H
751# define LIBMAD_FRAME_H
752
753
754 enum mad_layer {
755 MAD_LAYER_I = 1, /* Layer I */
756 MAD_LAYER_II = 2, /* Layer II */
757 MAD_LAYER_III = 3 /* Layer III */
758 };
759
760 enum mad_mode {
761 MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */
762 MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */
763 MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */
764 MAD_MODE_STEREO = 3 /* normal LR stereo */
765 };
766
767 enum mad_emphasis {
768 MAD_EMPHASIS_NONE = 0, /* no emphasis */
769 MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */
770 MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */
771 MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */
772 };
773
774 struct mad_header {
775 enum mad_layer layer; /* audio layer (1, 2, or 3) */
776 enum mad_mode mode; /* channel mode (see above) */
777 int mode_extension; /* additional mode info */
778 enum mad_emphasis emphasis; /* de-emphasis to use (see above) */
779
780 unsigned long bitrate; /* stream bitrate (bps) */
781 unsigned int samplerate; /* sampling frequency (Hz) */
782
783 unsigned short crc_check; /* frame CRC accumulator */
784 unsigned short crc_target; /* final target CRC checksum */
785
786 int flags; /* flags (see below) */
787 int private_bits; /* private bits (see below) */
788
789 mad_timer_t duration; /* audio playing time of frame */
790 };
791
792 struct mad_frame {
793 struct mad_header header; /* MPEG audio header */
794
795 int options; /* decoding options (from stream) */
796
797 mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
798 mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
799 };
800
801# define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)
802# define MAD_NSBSAMPLES(header) \
803 ((header)->layer == MAD_LAYER_I ? 12 : \
804 (((header)->layer == MAD_LAYER_III && \
805 ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
806
807 enum {
808 MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */
809 MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */
810
811 MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */
812 MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */
813 MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */
814 MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */
815
816 MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */
817 MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */
818 MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */
819
820 MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */
821 MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */
822 MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */
823 };
824
825 enum {
826 MAD_PRIVATE_HEADER = 0x0100, /* header private bit */
827 MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */
828 };
829
830 void mad_header_init(struct mad_header *);
831
832# define mad_header_finish(header) /* nothing */
833
834 int mad_header_decode(struct mad_header *, struct mad_stream *);
835
836 void mad_frame_init(struct mad_frame *);
837 void mad_frame_finish(struct mad_frame *);
838
839 int mad_frame_decode(struct mad_frame *, struct mad_stream *);
840
841 void mad_frame_mute(struct mad_frame *);
842
843# endif
844
845 /* Id: synth.h,v 1.15 2004/01/23 09:41:33 rob Exp */
846
847# ifndef LIBMAD_SYNTH_H
848# define LIBMAD_SYNTH_H
849
850
851 struct mad_pcm {
852 unsigned int samplerate; /* sampling frequency (Hz) */
853 unsigned short channels; /* number of channels */
854 unsigned short length; /* number of samples per channel */
855 mad_fixed_t samples[2][1152]; /* PCM output samples [ch][sample] */
856 };
857
858 struct mad_synth {
859 mad_fixed_t filter[2][2][2][16][8]; /* polyphase filterbank outputs */
860 /* [ch][eo][peo][s][v] */
861
862 unsigned int phase; /* current processing phase */
863
864 struct mad_pcm pcm; /* PCM output */
865 };
866
867 /* single channel PCM selector */
868 enum {
869 MAD_PCM_CHANNEL_SINGLE = 0
870 };
871
872 /* dual channel PCM selector */
873 enum {
874 MAD_PCM_CHANNEL_DUAL_1 = 0,
875 MAD_PCM_CHANNEL_DUAL_2 = 1
876 };
877
878 /* stereo PCM selector */
879 enum {
880 MAD_PCM_CHANNEL_STEREO_LEFT = 0,
881 MAD_PCM_CHANNEL_STEREO_RIGHT = 1
882 };
883
884 void mad_synth_init(struct mad_synth *);
885
886# define mad_synth_finish(synth) /* nothing */
887
888 void mad_synth_mute(struct mad_synth *);
889
890 void mad_synth_frame(struct mad_synth *, struct mad_frame const *);
891
892# endif
893
894 /* Id: decoder.h,v 1.17 2004/01/23 09:41:32 rob Exp */
895
896# ifndef LIBMAD_DECODER_H
897# define LIBMAD_DECODER_H
898
899
900 enum mad_decoder_mode {
901 MAD_DECODER_MODE_SYNC = 0,
902 MAD_DECODER_MODE_ASYNC
903 };
904
905 enum mad_flow {
906 MAD_FLOW_CONTINUE = 0x0000, /* continue normally */
907 MAD_FLOW_STOP = 0x0010, /* stop decoding normally */
908 MAD_FLOW_BREAK = 0x0011, /* stop decoding and signal an error */
909 MAD_FLOW_IGNORE = 0x0020 /* ignore the current frame */
910 };
911
912 struct mad_decoder {
913 enum mad_decoder_mode mode;
914
915 int options;
916
917 struct {
918 long pid;
919 int in;
920 int out;
921 } async;
922
923 struct {
924 struct mad_stream stream;
925 struct mad_frame frame;
926 struct mad_synth synth;
927 } *sync;
928
929 void *cb_data;
930
931 enum mad_flow(*input_func)(void *, struct mad_stream *);
932 enum mad_flow(*header_func)(void *, struct mad_header const *);
933 enum mad_flow(*filter_func)(void *,
934 struct mad_stream const *, struct mad_frame *);
935 enum mad_flow(*output_func)(void *,
936 struct mad_header const *, struct mad_pcm *);
937 enum mad_flow(*error_func)(void *, struct mad_stream *, struct mad_frame *);
938 enum mad_flow(*message_func)(void *, void *, unsigned int *);
939 };
940
941 void mad_decoder_init(struct mad_decoder *, void *,
942 enum mad_flow(*)(void *, struct mad_stream *),
943 enum mad_flow(*)(void *, struct mad_header const *),
944 enum mad_flow(*)(void *,
945 struct mad_stream const *,
946 struct mad_frame *),
947 enum mad_flow(*)(void *,
948 struct mad_header const *,
949 struct mad_pcm *),
950 enum mad_flow(*)(void *,
951 struct mad_stream *,
952 struct mad_frame *),
953 enum mad_flow(*)(void *, void *, unsigned int *));
954 int mad_decoder_finish(struct mad_decoder *);
955
956# define mad_decoder_options(decoder, opts) \
957 ((void) ((decoder)->options = (opts)))
958
959 int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
960 int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);
961
962# endif
963
964# ifdef __cplusplus
965}
966# endif
967
generated by cgit at 2024-05-18 18:26:03 (GMT)