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 /* Id: version.h,v 1.26 2004/01/23 09:41:33 rob Exp */
30
31 # ifndef LIBMAD_VERSION_H
32 # define LIBMAD_VERSION_H
33
34 # define MAD_VERSION_MAJOR 0
35 # define MAD_VERSION_MINOR 15
36 # define MAD_VERSION_PATCH 1
37 # define MAD_VERSION_EXTRA " (beta)"
38
39 # define MAD_VERSION_STRINGIZE(str) #str
40 # define MAD_VERSION_STRING(num) MAD_VERSION_STRINGIZE(num)
41
42 # define MAD_VERSION MAD_VERSION_STRING(MAD_VERSION_MAJOR) "." \
43 MAD_VERSION_STRING(MAD_VERSION_MINOR) "." \
44 MAD_VERSION_STRING(MAD_VERSION_PATCH) \
45 MAD_VERSION_EXTRA
46
47 # define MAD_PUBLISHYEAR "2000-2004"
48 # define MAD_AUTHOR "Underbit Technologies, Inc."
49 # define MAD_EMAIL "info@underbit.com"
50
51 extern char const mad_version[];
52 extern char const mad_copyright[];
53 extern char const mad_author[];
54 extern char const mad_build[];
55
56 # endif
57
58 /* Id: fixed.h,v 1.38 2004/02/17 02:02:03 rob Exp */
59
60 # ifndef LIBMAD_FIXED_H
61 # define LIBMAD_FIXED_H
62
63 typedef signed int mad_fixed_t;
64
65 typedef signed int mad_fixed64hi_t;
66 typedef unsigned int mad_fixed64lo_t;
67
68 # if defined(_MSC_VER)
69 # define mad_fixed64_t signed __int64
70 # elif 1 || defined(__GNUC__)
71 # define mad_fixed64_t signed long long
72 # endif
73
74 # if defined(FPM_FLOAT)
75 typedef double mad_sample_t;
76 # else
77 typedef mad_fixed_t mad_sample_t;
78 # endif
79
80 /*
81 * Fixed-point format: 0xABBBBBBB
82 * A == whole part (sign + 3 bits)
83 * B == fractional part (28 bits)
84 *
85 * Values are signed two's complement, so the effective range is:
86 * 0x80000000 to 0x7fffffff
87 * -8.0 to +7.9999999962747097015380859375
88 *
89 * The smallest representable value is:
90 * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
91 *
92 * 28 bits of fractional accuracy represent about
93 * 8.6 digits of decimal accuracy.
94 *
95 * Fixed-point numbers can be added or subtracted as normal
96 * integers, but multiplication requires shifting the 64-bit result
97 * from 56 fractional bits back to 28 (and rounding.)
98 *
99 * Changing the definition of MAD_F_FRACBITS is only partially
100 * supported, and must be done with care.
101 */
102
103 # define MAD_F_FRACBITS 28
104
105 # if MAD_F_FRACBITS == 28
106 # define MAD_F(x) ((mad_fixed_t) (x##L))
107 # else
108 # if MAD_F_FRACBITS < 28
109 # warning "MAD_F_FRACBITS < 28"
110 # define MAD_F(x) ((mad_fixed_t) \
111 (((x##L) + \
112 (1L << (28 - MAD_F_FRACBITS - 1))) >> \
113 (28 - MAD_F_FRACBITS)))
114 # elif MAD_F_FRACBITS > 28
115 # error "MAD_F_FRACBITS > 28 not currently supported"
116 # define MAD_F(x) ((mad_fixed_t) \
117 ((x##L) << (MAD_F_FRACBITS - 28)))
118 # endif
119 # endif
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 # define mad_f_mul(x, y) \
158 ((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS))
159
160 # define MAD_F_SCALEBITS MAD_F_FRACBITS
161
162 /* --- Intel --------------------------------------------------------------- */
163
164 # elif defined(FPM_INTEL)
165
166 # if defined(_MSC_VER)
167 # pragma warning(push)
168 # pragma warning(disable: 4035) /* no return value */
169 static __forceinline
mad_f_mul_inline(mad_fixed_t x,mad_fixed_t y)170 mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y)
171 {
172 enum {
173 fracbits = MAD_F_FRACBITS
174 };
175
176 __asm {
177 mov eax, x
178 imul y
179 shrd eax, edx, fracbits
180 }
181
182 /* implicit return of eax */
183 }
184 # pragma warning(pop)
185
186 # define mad_f_mul mad_f_mul_inline
187 # define mad_f_scale64
188 # else
189 /*
190 * This Intel version is fast and accurate; the disposition of the least
191 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
192 */
193 # define MAD_F_MLX(hi, lo, x, y) \
194 asm ("imull %3" \
195 : "=a" (lo), "=d" (hi) \
196 : "%a" (x), "rm" (y) \
197 : "cc")
198
199 # if defined(OPT_INTEL)
200 /*
201 * Alternate Intel scaling that may or may not perform better.
202 */
203 # define mad_f_scale64(hi, lo) \
204 ({ mad_fixed_t __result; \
205 asm ("shrl %3,%1\n\t" \
206 "shll %4,%2\n\t" \
207 "orl %2,%1" \
208 : "=rm" (__result) \
209 : "0" (lo), "r" (hi), \
210 "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \
211 : "cc"); \
212 __result; \
213 })
214 # else
215 # define mad_f_scale64(hi, lo) \
216 ({ mad_fixed_t __result; \
217 asm ("shrdl %3,%2,%1" \
218 : "=rm" (__result) \
219 : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS) \
220 : "cc"); \
221 __result; \
222 })
223 # endif
224
225 # define MAD_F_SCALEBITS MAD_F_FRACBITS
226 # endif
227
228 /* --- ARM ----------------------------------------------------------------- */
229
230 # elif defined(FPM_ARM)
231
232 /*
233 * This ARM V4 version is as accurate as FPM_64BIT but much faster. The
234 * least significant bit is properly rounded at no CPU cycle cost!
235 */
236 # if 1
237 /*
238 * This is faster than the default implementation via MAD_F_MLX() and
239 * mad_f_scale64().
240 */
241 # define mad_f_mul(x, y) \
242 ({ mad_fixed64hi_t __hi; \
243 mad_fixed64lo_t __lo; \
244 mad_fixed_t __result; \
245 asm ("smull %0, %1, %3, %4\n\t" \
246 "movs %0, %0, lsr %5\n\t" \
247 "adc %2, %0, %1, lsl %6" \
248 : "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
249 : "%r" (x), "r" (y), \
250 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
251 : "cc"); \
252 __result; \
253 })
254 # endif
255
256 # define MAD_F_MLX(hi, lo, x, y) \
257 asm ("smull %0, %1, %2, %3" \
258 : "=&r" (lo), "=&r" (hi) \
259 : "%r" (x), "r" (y))
260
261 # define MAD_F_MLA(hi, lo, x, y) \
262 asm ("smlal %0, %1, %2, %3" \
263 : "+r" (lo), "+r" (hi) \
264 : "%r" (x), "r" (y))
265
266 # define MAD_F_MLN(hi, lo) \
267 asm ("rsbs %0, %2, #0\n\t" \
268 "rsc %1, %3, #0" \
269 : "=r" (lo), "=r" (hi) \
270 : "0" (lo), "1" (hi) \
271 : "cc")
272
273 # define mad_f_scale64(hi, lo) \
274 ({ mad_fixed_t __result; \
275 asm ("movs %0, %1, lsr %3\n\t" \
276 "adc %0, %0, %2, lsl %4" \
277 : "=&r" (__result) \
278 : "r" (lo), "r" (hi), \
279 "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
280 : "cc"); \
281 __result; \
282 })
283
284 # define MAD_F_SCALEBITS MAD_F_FRACBITS
285
286 /* --- MIPS ---------------------------------------------------------------- */
287
288 # elif defined(FPM_MIPS)
289
290 /*
291 * This MIPS version is fast and accurate; the disposition of the least
292 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
293 */
294 # define MAD_F_MLX(hi, lo, x, y) \
295 asm ("mult %2,%3" \
296 : "=l" (lo), "=h" (hi) \
297 : "%r" (x), "r" (y))
298
299 # if defined(HAVE_MADD_ASM)
300 # define MAD_F_MLA(hi, lo, x, y) \
301 asm ("madd %2,%3" \
302 : "+l" (lo), "+h" (hi) \
303 : "%r" (x), "r" (y))
304 # elif defined(HAVE_MADD16_ASM)
305 /*
306 * This loses significant accuracy due to the 16-bit integer limit in the
307 * multiply/accumulate instruction.
308 */
309 # define MAD_F_ML0(hi, lo, x, y) \
310 asm ("mult %2,%3" \
311 : "=l" (lo), "=h" (hi) \
312 : "%r" ((x) >> 12), "r" ((y) >> 16))
313 # define MAD_F_MLA(hi, lo, x, y) \
314 asm ("madd16 %2,%3" \
315 : "+l" (lo), "+h" (hi) \
316 : "%r" ((x) >> 12), "r" ((y) >> 16))
317 # define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo))
318 # endif
319
320 # define mad_f_scale64(hi, lo) \
321 ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS)))
322 # define MAD_F_SCALEBITS MAD_F_FRACBITS
323
324 /* --- SPARC --------------------------------------------------------------- */
325
326 # elif defined(FPM_SPARC)
327
328 /*
329 * This SPARC V8 version is fast and accurate; the disposition of the least
330 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
331 */
332 # define MAD_F_MLX(hi, lo, x, y) \
333 asm ("smul %2, %3, %0\n\t" \
334 "rd %%y, %1" \
335 : "=r" (lo), "=r" (hi) \
336 : "%r" (x), "rI" (y))
337
338 /* --- PowerPC ------------------------------------------------------------- */
339
340 # elif defined(FPM_PPC)
341
342 /*
343 * This PowerPC version is fast and accurate; the disposition of the least
344 * significant bit depends on OPT_ACCURACY via mad_f_scale64().
345 */
346 # define MAD_F_MLX(hi, lo, x, y) \
347 do { \
348 asm ("mullw %0,%1,%2" \
349 : "=r" (lo) \
350 : "%r" (x), "r" (y)); \
351 asm ("mulhw %0,%1,%2" \
352 : "=r" (hi) \
353 : "%r" (x), "r" (y)); \
354 } \
355 while (0)
356
357 # define mad_f_scale64(hi, lo) \
358 ({ mad_fixed_t __result; \
359 asm ("rotrwi %0,%1,%2" \
360 : "=r" (__result) \
361 : "r" (lo), "i" (MAD_F_SCALEBITS)); \
362 asm ("insrwi %0,%1,%2,0" \
363 : "+r" (__result) \
364 : "r" (hi), "i" (MAD_F_SCALEBITS)); \
365 __result; \
366 })
367
368 # define MAD_F_SCALEBITS MAD_F_FRACBITS
369
370 /* --- Default ------------------------------------------------------------- */
371
372 # elif defined(FPM_DEFAULT)
373
374 /*
375 * This version is the most portable but it loses significant accuracy.
376 * Furthermore, accuracy is biased against the second argument, so care
377 * should be taken when ordering operands.
378 *
379 * The scale factors are constant as this is not used with SSO.
380 *
381 * Pre-rounding is required to stay within the limits of compliance.
382 */
383 # define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16))
384
385 /* ------------------------------------------------------------------------- */
386
387 # else
388 # error "no FPM selected"
389 # endif
390
391 /* default implementations */
392
393 # if !defined(mad_f_mul)
394 # define mad_f_mul(x, y) \
395 ({ register mad_fixed64hi_t __hi; \
396 register mad_fixed64lo_t __lo; \
397 MAD_F_MLX(__hi, __lo, (x), (y)); \
398 mad_f_scale64(__hi, __lo); \
399 })
400 # endif
401
402 # if !defined(MAD_F_MLA)
403 # define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y)))
404 # define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y)))
405 # define MAD_F_MLN(hi, lo) ((lo) = -(lo))
406 # define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo))
407 # endif
408
409 # if !defined(MAD_F_ML0)
410 # define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y))
411 # endif
412
413 # if !defined(MAD_F_MLN)
414 # define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi))
415 # endif
416
417 # if !defined(MAD_F_MLZ)
418 # define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo))
419 # endif
420
421 # if !defined(mad_f_scale64)
422 # define mad_f_scale64(hi, lo) \
423 ((mad_fixed_t) \
424 (((hi) << (32 - MAD_F_SCALEBITS)) | \
425 ((lo) >> MAD_F_SCALEBITS)))
426 # define MAD_F_SCALEBITS MAD_F_FRACBITS
427 # endif
428
429 /* C routines */
430
431 mad_fixed_t mad_f_abs(mad_fixed_t);
432 mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t);
433
434 # endif
435
436 /* Id: bit.h,v 1.12 2004/01/23 09:41:32 rob Exp */
437
438 # ifndef LIBMAD_BIT_H
439 # define LIBMAD_BIT_H
440
441 struct mad_bitptr {
442 unsigned char const *byte;
443 unsigned short cache;
444 unsigned short left;
445 };
446
447 void mad_bit_init(struct mad_bitptr *, unsigned char const *);
448
449 # define mad_bit_finish(bitptr) /* nothing */
450
451 unsigned int mad_bit_length(struct mad_bitptr const *,
452 struct mad_bitptr const *);
453
454 # define mad_bit_bitsleft(bitptr) ((bitptr)->left)
455 unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *);
456
457 void mad_bit_skip(struct mad_bitptr *, unsigned int);
458 unsigned long mad_bit_read(struct mad_bitptr *, unsigned int);
459 void mad_bit_write(struct mad_bitptr *, unsigned int, unsigned long);
460
461 unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short);
462
463 # endif
464
465 /* Id: timer.h,v 1.16 2004/01/23 09:41:33 rob Exp */
466
467 # ifndef LIBMAD_TIMER_H
468 # define LIBMAD_TIMER_H
469
470 typedef struct {
471 signed long seconds; /* whole seconds */
472 unsigned long fraction; /* 1/MAD_TIMER_RESOLUTION seconds */
473 } mad_timer_t;
474
475 extern mad_timer_t const mad_timer_zero;
476
477 # define MAD_TIMER_RESOLUTION 352800000UL
478
479 enum mad_units {
480 MAD_UNITS_HOURS = -2,
481 MAD_UNITS_MINUTES = -1,
482 MAD_UNITS_SECONDS = 0,
483
484 /* metric units */
485
486 MAD_UNITS_DECISECONDS = 10,
487 MAD_UNITS_CENTISECONDS = 100,
488 MAD_UNITS_MILLISECONDS = 1000,
489
490 /* audio sample units */
491
492 MAD_UNITS_8000_HZ = 8000,
493 MAD_UNITS_11025_HZ = 11025,
494 MAD_UNITS_12000_HZ = 12000,
495
496 MAD_UNITS_16000_HZ = 16000,
497 MAD_UNITS_22050_HZ = 22050,
498 MAD_UNITS_24000_HZ = 24000,
499
500 MAD_UNITS_32000_HZ = 32000,
501 MAD_UNITS_44100_HZ = 44100,
502 MAD_UNITS_48000_HZ = 48000,
503
504 /* video frame/field units */
505
506 MAD_UNITS_24_FPS = 24,
507 MAD_UNITS_25_FPS = 25,
508 MAD_UNITS_30_FPS = 30,
509 MAD_UNITS_48_FPS = 48,
510 MAD_UNITS_50_FPS = 50,
511 MAD_UNITS_60_FPS = 60,
512
513 /* CD audio frames */
514
515 MAD_UNITS_75_FPS = 75,
516
517 /* video drop-frame units */
518
519 MAD_UNITS_23_976_FPS = -24,
520 MAD_UNITS_24_975_FPS = -25,
521 MAD_UNITS_29_97_FPS = -30,
522 MAD_UNITS_47_952_FPS = -48,
523 MAD_UNITS_49_95_FPS = -50,
524 MAD_UNITS_59_94_FPS = -60
525 };
526
527 # define mad_timer_reset(timer) ((void) (*(timer) = mad_timer_zero))
528
529 int mad_timer_compare(mad_timer_t, mad_timer_t);
530
531 # define mad_timer_sign(timer) mad_timer_compare((timer), mad_timer_zero)
532
533 void mad_timer_negate(mad_timer_t *);
534 mad_timer_t mad_timer_abs(mad_timer_t);
535
536 void mad_timer_set(mad_timer_t *, unsigned long, unsigned long, unsigned long);
537 void mad_timer_add(mad_timer_t *, mad_timer_t);
538 void mad_timer_multiply(mad_timer_t *, signed long);
539
540 signed long mad_timer_count(mad_timer_t, enum mad_units);
541 unsigned long mad_timer_fraction(mad_timer_t, unsigned long);
542 void mad_timer_string(mad_timer_t, char *, char const *,
543 enum mad_units, enum mad_units, unsigned long);
544
545 # endif
546
547 /* Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp */
548
549 # ifndef LIBMAD_STREAM_H
550 # define LIBMAD_STREAM_H
551
552
553 # define MAD_BUFFER_GUARD 8
554 # define MAD_BUFFER_MDLEN (511 + 2048 + MAD_BUFFER_GUARD)
555
556 enum mad_error {
557 MAD_ERROR_NONE = 0x0000, /* no error */
558
559 MAD_ERROR_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
560 MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
561
562 MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
563
564 MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
565 MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
566 MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
567 MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
568 MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
569
570 MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
571 MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
572 MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
573 MAD_ERROR_BADMODE = 0x0222, /* bad bitrate/mode combination */
574 MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
575 MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
576 MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
577 MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
578 MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
579 MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
580 MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
581 MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
582 MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
583 };
584
585 # define MAD_RECOVERABLE(error) ((error) & 0xff00)
586
587 struct mad_stream {
588 unsigned char const *buffer; /* input bitstream buffer */
589 unsigned char const *bufend; /* end of buffer */
590 unsigned long skiplen; /* bytes to skip before next frame */
591
592 int sync; /* stream sync found */
593 unsigned long freerate; /* free bitrate (fixed) */
594
595 unsigned char const *this_frame; /* start of current frame */
596 unsigned char const *next_frame; /* start of next frame */
597 struct mad_bitptr ptr; /* current processing bit pointer */
598
599 struct mad_bitptr anc_ptr; /* ancillary bits pointer */
600 unsigned int anc_bitlen; /* number of ancillary bits */
601
602 unsigned char (*main_data)[MAD_BUFFER_MDLEN];
603 /* Layer III main_data() */
604 unsigned int md_len; /* bytes in main_data */
605
606 int options; /* decoding options (see below) */
607 enum mad_error error; /* error code (see above) */
608 };
609
610 enum {
611 MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
612 MAD_OPTION_HALFSAMPLERATE = 0x0002 /* generate PCM at 1/2 sample rate */
613 # if 0 /* not yet implemented */
614 MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
615 MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
616 MAD_OPTION_SINGLECHANNEL = 0x0030 /* combine channels */
617 # endif
618 };
619
620 void mad_stream_init(struct mad_stream *);
621 void mad_stream_finish(struct mad_stream *);
622
623 # define mad_stream_options(stream, opts) \
624 ((void) ((stream)->options = (opts)))
625
626 void mad_stream_buffer(struct mad_stream *,
627 unsigned char const *, unsigned long);
628 void mad_stream_skip(struct mad_stream *, unsigned long);
629
630 int mad_stream_sync(struct mad_stream *);
631
632 char const *mad_stream_errorstr(struct mad_stream const *);
633
634 # endif
635
636 /* Id: frame.h,v 1.20 2004/01/23 09:41:32 rob Exp */
637
638 # ifndef LIBMAD_FRAME_H
639 # define LIBMAD_FRAME_H
640
641
642 enum mad_layer {
643 MAD_LAYER_I = 1, /* Layer I */
644 MAD_LAYER_II = 2, /* Layer II */
645 MAD_LAYER_III = 3 /* Layer III */
646 };
647
648 enum mad_mode {
649 MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */
650 MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */
651 MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */
652 MAD_MODE_STEREO = 3 /* normal LR stereo */
653 };
654
655 enum mad_emphasis {
656 MAD_EMPHASIS_NONE = 0, /* no emphasis */
657 MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */
658 MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */
659 MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */
660 };
661
662 struct mad_header {
663 enum mad_layer layer; /* audio layer (1, 2, or 3) */
664 enum mad_mode mode; /* channel mode (see above) */
665 int mode_extension; /* additional mode info */
666 enum mad_emphasis emphasis; /* de-emphasis to use (see above) */
667
668 unsigned long bitrate; /* stream bitrate (bps) */
669 unsigned int samplerate; /* sampling frequency (Hz) */
670
671 unsigned short crc_check; /* frame CRC accumulator */
672 unsigned short crc_target; /* final target CRC checksum */
673
674 int flags; /* flags (see below) */
675 int private_bits; /* private bits (see below) */
676
677 mad_timer_t duration; /* audio playing time of frame */
678 };
679
680 struct mad_frame {
681 struct mad_header header; /* MPEG audio header */
682
683 int options; /* decoding options (from stream) */
684
685 mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
686 mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
687 };
688
689 # define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)
690 # define MAD_NSBSAMPLES(header) \
691 ((header)->layer == MAD_LAYER_I ? 12 : \
692 (((header)->layer == MAD_LAYER_III && \
693 ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
694
695 enum {
696 MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */
697 MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */
698
699 MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */
700 MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */
701 MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */
702 MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */
703
704 MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */
705 MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */
706 MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */
707
708 MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */
709 MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */
710 MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */
711 };
712
713 enum {
714 MAD_PRIVATE_HEADER = 0x0100, /* header private bit */
715 MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */
716 };
717
718 void mad_header_init(struct mad_header *);
719
720 # define mad_header_finish(header) /* nothing */
721
722 int mad_header_decode(struct mad_header *, struct mad_stream *);
723
724 void mad_frame_init(struct mad_frame *);
725 void mad_frame_finish(struct mad_frame *);
726
727 int mad_frame_decode(struct mad_frame *, struct mad_stream *);
728
729 void mad_frame_mute(struct mad_frame *);
730
731 # endif
732
733 /* Id: synth.h,v 1.15 2004/01/23 09:41:33 rob Exp */
734
735 # ifndef LIBMAD_SYNTH_H
736 # define LIBMAD_SYNTH_H
737
738
739 struct mad_pcm {
740 unsigned int samplerate; /* sampling frequency (Hz) */
741 unsigned short channels; /* number of channels */
742 unsigned short length; /* number of samples per channel */
743 mad_fixed_t samples[2][1152]; /* PCM output samples [ch][sample] */
744 };
745
746 struct mad_synth {
747 mad_fixed_t filter[2][2][2][16][8]; /* polyphase filterbank outputs */
748 /* [ch][eo][peo][s][v] */
749
750 unsigned int phase; /* current processing phase */
751
752 struct mad_pcm pcm; /* PCM output */
753 };
754
755 /* single channel PCM selector */
756 enum {
757 MAD_PCM_CHANNEL_SINGLE = 0
758 };
759
760 /* dual channel PCM selector */
761 enum {
762 MAD_PCM_CHANNEL_DUAL_1 = 0,
763 MAD_PCM_CHANNEL_DUAL_2 = 1
764 };
765
766 /* stereo PCM selector */
767 enum {
768 MAD_PCM_CHANNEL_STEREO_LEFT = 0,
769 MAD_PCM_CHANNEL_STEREO_RIGHT = 1
770 };
771
772 void mad_synth_init(struct mad_synth *);
773
774 # define mad_synth_finish(synth) /* nothing */
775
776 void mad_synth_mute(struct mad_synth *);
777
778 void mad_synth_frame(struct mad_synth *, struct mad_frame const *);
779
780 # endif
781
782 /* Id: decoder.h,v 1.17 2004/01/23 09:41:32 rob Exp */
783
784 # ifndef LIBMAD_DECODER_H
785 # define LIBMAD_DECODER_H
786
787
788 enum mad_decoder_mode {
789 MAD_DECODER_MODE_SYNC = 0,
790 MAD_DECODER_MODE_ASYNC
791 };
792
793 enum mad_flow {
794 MAD_FLOW_CONTINUE = 0x0000, /* continue normally */
795 MAD_FLOW_STOP = 0x0010, /* stop decoding normally */
796 MAD_FLOW_BREAK = 0x0011, /* stop decoding and signal an error */
797 MAD_FLOW_IGNORE = 0x0020 /* ignore the current frame */
798 };
799
800 struct mad_decoder {
801 enum mad_decoder_mode mode;
802
803 int options;
804
805 struct {
806 long pid;
807 int in;
808 int out;
809 } async;
810
811 struct {
812 struct mad_stream stream;
813 struct mad_frame frame;
814 struct mad_synth synth;
815 } *sync;
816
817 void *cb_data;
818
819 enum mad_flow (*input_func)(void *, struct mad_stream *);
820 enum mad_flow (*header_func)(void *, struct mad_header const *);
821 enum mad_flow (*filter_func)(void *,
822 struct mad_stream const *, struct mad_frame *);
823 enum mad_flow (*output_func)(void *,
824 struct mad_header const *, struct mad_pcm *);
825 enum mad_flow (*error_func)(void *, struct mad_stream *, struct mad_frame *);
826 enum mad_flow (*message_func)(void *, void *, unsigned int *);
827 };
828
829 void mad_decoder_init(struct mad_decoder *, void *,
830 enum mad_flow (*)(void *, struct mad_stream *),
831 enum mad_flow (*)(void *, struct mad_header const *),
832 enum mad_flow (*)(void *,
833 struct mad_stream const *,
834 struct mad_frame *),
835 enum mad_flow (*)(void *,
836 struct mad_header const *,
837 struct mad_pcm *),
838 enum mad_flow (*)(void *,
839 struct mad_stream *,
840 struct mad_frame *),
841 enum mad_flow (*)(void *, void *, unsigned int *));
842 int mad_decoder_finish(struct mad_decoder *);
843
844 # define mad_decoder_options(decoder, opts) \
845 ((void) ((decoder)->options = (opts)))
846
847 int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
848 int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);
849
850 # endif
851
852 # ifdef __cplusplus
853 }
854 # endif
855