mad.h
上传用户:detong
上传日期:2022-06-22
资源大小:20675k
文件大小:27k
- /*
- * libmad - MPEG audio decoder library
- * Copyright (C) 2000-2004 Underbit Technologies, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * If you would like to negotiate alternate licensing terms, you may do
- * so by contacting: Underbit Technologies, Inc. <info@underbit.com>
- */
- # ifdef __cplusplus
- extern "C" {
- # endif
- # define FPM_ARM
- # define OPT_SPEED
- # define SIZEOF_INT 4
- # define SIZEOF_LONG 4
- # define SIZEOF_LONG_LONG 8
- /* Id: version.h,v 1.26 2004/01/23 09:41:33 rob Exp */
- # ifndef LIBMAD_VERSION_H
- # define LIBMAD_VERSION_H
- # define MAD_VERSION_MAJOR 0
- # define MAD_VERSION_MINOR 15
- # define MAD_VERSION_PATCH 1
- # define MAD_VERSION_EXTRA " (beta)"
- # define MAD_VERSION_STRINGIZE(str) #str
- # define MAD_VERSION_STRING(num) MAD_VERSION_STRINGIZE(num)
- # define MAD_VERSION MAD_VERSION_STRING(MAD_VERSION_MAJOR) "."
- MAD_VERSION_STRING(MAD_VERSION_MINOR) "."
- MAD_VERSION_STRING(MAD_VERSION_PATCH)
- MAD_VERSION_EXTRA
- # define MAD_PUBLISHYEAR "2000-2004"
- # define MAD_AUTHOR "Underbit Technologies, Inc."
- # define MAD_EMAIL "info@underbit.com"
- extern char const mad_version[];
- extern char const mad_copyright[];
- extern char const mad_author[];
- extern char const mad_build[];
- # endif
- /* Id: fixed.h,v 1.38 2004/02/17 02:02:03 rob Exp */
- # ifndef LIBMAD_FIXED_H
- # define LIBMAD_FIXED_H
- # if SIZEOF_INT >= 4
- typedef signed int mad_fixed_t;
- typedef signed int mad_fixed64hi_t;
- typedef unsigned int mad_fixed64lo_t;
- # else
- typedef signed long mad_fixed_t;
- typedef signed long mad_fixed64hi_t;
- typedef unsigned long mad_fixed64lo_t;
- # endif
- # if defined(_MSC_VER)
- # define mad_fixed64_t signed __int64
- # elif 1 || defined(__GNUC__)
- # define mad_fixed64_t signed long long
- # endif
- # if defined(FPM_FLOAT)
- typedef double mad_sample_t;
- # else
- typedef mad_fixed_t mad_sample_t;
- # endif
- /*
- * Fixed-point format: 0xABBBBBBB
- * A == whole part (sign + 3 bits)
- * B == fractional part (28 bits)
- *
- * Values are signed two's complement, so the effective range is:
- * 0x80000000 to 0x7fffffff
- * -8.0 to +7.9999999962747097015380859375
- *
- * The smallest representable value is:
- * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
- *
- * 28 bits of fractional accuracy represent about
- * 8.6 digits of decimal accuracy.
- *
- * Fixed-point numbers can be added or subtracted as normal
- * integers, but multiplication requires shifting the 64-bit result
- * from 56 fractional bits back to 28 (and rounding.)
- *
- * Changing the definition of MAD_F_FRACBITS is only partially
- * supported, and must be done with care.
- */
- # define MAD_F_FRACBITS 28
- # if MAD_F_FRACBITS == 28
- # define MAD_F(x) ((mad_fixed_t) (x##L))
- # else
- # if MAD_F_FRACBITS < 28
- # warning "MAD_F_FRACBITS < 28"
- # define MAD_F(x) ((mad_fixed_t)
- (((x##L) +
- (1L << (28 - MAD_F_FRACBITS - 1))) >>
- (28 - MAD_F_FRACBITS)))
- # elif MAD_F_FRACBITS > 28
- # error "MAD_F_FRACBITS > 28 not currently supported"
- # define MAD_F(x) ((mad_fixed_t)
- ((x##L) << (MAD_F_FRACBITS - 28)))
- # endif
- # endif
- # define MAD_F_MIN ((mad_fixed_t) -0x80000000L)
- # define MAD_F_MAX ((mad_fixed_t) +0x7fffffffL)
- # define MAD_F_ONE MAD_F(0x10000000)
- # define mad_f_tofixed(x) ((mad_fixed_t)
- ((x) * (double) (1L << MAD_F_FRACBITS) + 0.5))
- # define mad_f_todouble(x) ((double)
- ((x) / (double) (1L << MAD_F_FRACBITS)))
- # define mad_f_intpart(x) ((x) >> MAD_F_FRACBITS)
- # define mad_f_fracpart(x) ((x) & ((1L << MAD_F_FRACBITS) - 1))
- /* (x should be positive) */
- # define mad_f_fromint(x) ((x) << MAD_F_FRACBITS)
- # define mad_f_add(x, y) ((x) + (y))
- # define mad_f_sub(x, y) ((x) - (y))
- # if defined(FPM_FLOAT)
- # error "FPM_FLOAT not yet supported"
- # undef MAD_F
- # define MAD_F(x) mad_f_todouble(x)
- # define mad_f_mul(x, y) ((x) * (y))
- # define mad_f_scale64
- # undef ASO_ZEROCHECK
- # elif defined(FPM_64BIT)
- /*
- * This version should be the most accurate if 64-bit types are supported by
- * the compiler, although it may not be the most efficient.
- */
- # if defined(OPT_ACCURACY)
- # define mad_f_mul(x, y)
- ((mad_fixed_t)
- ((((mad_fixed64_t) (x) * (y)) +
- (1L << (MAD_F_SCALEBITS - 1))) >> MAD_F_SCALEBITS))
- # else
- # define mad_f_mul(x, y)
- ((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS))
- # endif
- # define MAD_F_SCALEBITS MAD_F_FRACBITS
- /* --- Intel --------------------------------------------------------------- */
- # elif defined(FPM_INTEL)
- # if defined(_MSC_VER)
- # pragma warning(push)
- # pragma warning(disable: 4035) /* no return value */
- static __forceinline
- mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y)
- {
- enum {
- fracbits = MAD_F_FRACBITS
- };
- __asm {
- mov eax, x
- imul y
- shrd eax, edx, fracbits
- }
- /* implicit return of eax */
- }
- # pragma warning(pop)
- # define mad_f_mul mad_f_mul_inline
- # define mad_f_scale64
- # else
- /*
- * This Intel version is fast and accurate; the disposition of the least
- * significant bit depends on OPT_ACCURACY via mad_f_scale64().
- */
- # define MAD_F_MLX(hi, lo, x, y)
- asm ("imull %3"
- : "=a" (lo), "=d" (hi)
- : "%a" (x), "rm" (y)
- : "cc")
- # if defined(OPT_ACCURACY)
- /*
- * This gives best accuracy but is not very fast.
- */
- # define MAD_F_MLA(hi, lo, x, y)
- ({ mad_fixed64hi_t __hi;
- mad_fixed64lo_t __lo;
- MAD_F_MLX(__hi, __lo, (x), (y));
- asm ("addl %2,%0nt"
- "adcl %3,%1"
- : "=rm" (lo), "=rm" (hi)
- : "r" (__lo), "r" (__hi), "0" (lo), "1" (hi)
- : "cc");
- })
- # endif /* OPT_ACCURACY */
- # if defined(OPT_ACCURACY)
- /*
- * Surprisingly, this is faster than SHRD followed by ADC.
- */
- # define mad_f_scale64(hi, lo)
- ({ mad_fixed64hi_t __hi_;
- mad_fixed64lo_t __lo_;
- mad_fixed_t __result;
- asm ("addl %4,%2nt"
- "adcl %5,%3"
- : "=rm" (__lo_), "=rm" (__hi_)
- : "0" (lo), "1" (hi),
- "ir" (1L << (MAD_F_SCALEBITS - 1)), "ir" (0)
- : "cc");
- asm ("shrdl %3,%2,%1"
- : "=rm" (__result)
- : "0" (__lo_), "r" (__hi_), "I" (MAD_F_SCALEBITS)
- : "cc");
- __result;
- })
- # elif defined(OPT_INTEL)
- /*
- * Alternate Intel scaling that may or may not perform better.
- */
- # define mad_f_scale64(hi, lo)
- ({ mad_fixed_t __result;
- asm ("shrl %3,%1nt"
- "shll %4,%2nt"
- "orl %2,%1"
- : "=rm" (__result)
- : "0" (lo), "r" (hi),
- "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS)
- : "cc");
- __result;
- })
- # else
- # define mad_f_scale64(hi, lo)
- ({ mad_fixed_t __result;
- asm ("shrdl %3,%2,%1"
- : "=rm" (__result)
- : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS)
- : "cc");
- __result;
- })
- # endif /* OPT_ACCURACY */
- # define MAD_F_SCALEBITS MAD_F_FRACBITS
- # endif
- /* --- ARM ----------------------------------------------------------------- */
- # elif defined(FPM_ARM)
- /*
- * This ARM V4 version is as accurate as FPM_64BIT but much faster. The
- * least significant bit is properly rounded at no CPU cycle cost!
- */
- # if 1
- /*
- * This is faster than the default implementation via MAD_F_MLX() and
- * mad_f_scale64().
- */
- # define mad_f_mul(x, y)
- ({ mad_fixed64hi_t __hi;
- mad_fixed64lo_t __lo;
- mad_fixed_t __result;
- asm ("smull %0, %1, %3, %4nt"
- "movs %0, %0, lsr %5nt"
- "adc %2, %0, %1, lsl %6"
- : "=&r" (__lo), "=&r" (__hi), "=r" (__result)
- : "%r" (x), "r" (y),
- "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS)
- : "cc");
- __result;
- })
- # endif
- # define MAD_F_MLX(hi, lo, x, y)
- asm ("smull %0, %1, %2, %3"
- : "=&r" (lo), "=&r" (hi)
- : "%r" (x), "r" (y))
- # define MAD_F_MLA(hi, lo, x, y)
- asm ("smlal %0, %1, %2, %3"
- : "+r" (lo), "+r" (hi)
- : "%r" (x), "r" (y))
- # define MAD_F_MLN(hi, lo)
- asm ("rsbs %0, %2, #0nt"
- "rsc %1, %3, #0"
- : "=r" (lo), "=r" (hi)
- : "0" (lo), "1" (hi)
- : "cc")
- # define mad_f_scale64(hi, lo)
- ({ mad_fixed_t __result;
- asm ("movs %0, %1, lsr %3nt"
- "adc %0, %0, %2, lsl %4"
- : "=&r" (__result)
- : "r" (lo), "r" (hi),
- "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS)
- : "cc");
- __result;
- })
- # define MAD_F_SCALEBITS MAD_F_FRACBITS
- /* --- MIPS ---------------------------------------------------------------- */
- # elif defined(FPM_MIPS)
- /*
- * This MIPS version is fast and accurate; the disposition of the least
- * significant bit depends on OPT_ACCURACY via mad_f_scale64().
- */
- # define MAD_F_MLX(hi, lo, x, y)
- asm ("mult %2,%3"
- : "=l" (lo), "=h" (hi)
- : "%r" (x), "r" (y))
- # if defined(HAVE_MADD_ASM)
- # define MAD_F_MLA(hi, lo, x, y)
- asm ("madd %2,%3"
- : "+l" (lo), "+h" (hi)
- : "%r" (x), "r" (y))
- # elif defined(HAVE_MADD16_ASM)
- /*
- * This loses significant accuracy due to the 16-bit integer limit in the
- * multiply/accumulate instruction.
- */
- # define MAD_F_ML0(hi, lo, x, y)
- asm ("mult %2,%3"
- : "=l" (lo), "=h" (hi)
- : "%r" ((x) >> 12), "r" ((y) >> 16))
- # define MAD_F_MLA(hi, lo, x, y)
- asm ("madd16 %2,%3"
- : "+l" (lo), "+h" (hi)
- : "%r" ((x) >> 12), "r" ((y) >> 16))
- # define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo))
- # endif
- # if defined(OPT_SPEED)
- # define mad_f_scale64(hi, lo)
- ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS)))
- # define MAD_F_SCALEBITS MAD_F_FRACBITS
- # endif
- /* --- SPARC --------------------------------------------------------------- */
- # elif defined(FPM_SPARC)
- /*
- * This SPARC V8 version is fast and accurate; the disposition of the least
- * significant bit depends on OPT_ACCURACY via mad_f_scale64().
- */
- # define MAD_F_MLX(hi, lo, x, y)
- asm ("smul %2, %3, %0nt"
- "rd %%y, %1"
- : "=r" (lo), "=r" (hi)
- : "%r" (x), "rI" (y))
- /* --- PowerPC ------------------------------------------------------------- */
- # elif defined(FPM_PPC)
- /*
- * This PowerPC version is fast and accurate; the disposition of the least
- * significant bit depends on OPT_ACCURACY via mad_f_scale64().
- */
- # define MAD_F_MLX(hi, lo, x, y)
- do {
- asm ("mullw %0,%1,%2"
- : "=r" (lo)
- : "%r" (x), "r" (y));
- asm ("mulhw %0,%1,%2"
- : "=r" (hi)
- : "%r" (x), "r" (y));
- }
- while (0)
- # if defined(OPT_ACCURACY)
- /*
- * This gives best accuracy but is not very fast.
- */
- # define MAD_F_MLA(hi, lo, x, y)
- ({ mad_fixed64hi_t __hi;
- mad_fixed64lo_t __lo;
- MAD_F_MLX(__hi, __lo, (x), (y));
- asm ("addc %0,%2,%3nt"
- "adde %1,%4,%5"
- : "=r" (lo), "=r" (hi)
- : "%r" (lo), "r" (__lo),
- "%r" (hi), "r" (__hi)
- : "xer");
- })
- # endif
- # if defined(OPT_ACCURACY)
- /*
- * This is slower than the truncating version below it.
- */
- # define mad_f_scale64(hi, lo)
- ({ mad_fixed_t __result, __round;
- asm ("rotrwi %0,%1,%2"
- : "=r" (__result)
- : "r" (lo), "i" (MAD_F_SCALEBITS));
- asm ("extrwi %0,%1,1,0"
- : "=r" (__round)
- : "r" (__result));
- asm ("insrwi %0,%1,%2,0"
- : "+r" (__result)
- : "r" (hi), "i" (MAD_F_SCALEBITS));
- asm ("add %0,%1,%2"
- : "=r" (__result)
- : "%r" (__result), "r" (__round));
- __result;
- })
- # else
- # define mad_f_scale64(hi, lo)
- ({ mad_fixed_t __result;
- asm ("rotrwi %0,%1,%2"
- : "=r" (__result)
- : "r" (lo), "i" (MAD_F_SCALEBITS));
- asm ("insrwi %0,%1,%2,0"
- : "+r" (__result)
- : "r" (hi), "i" (MAD_F_SCALEBITS));
- __result;
- })
- # endif
- # define MAD_F_SCALEBITS MAD_F_FRACBITS
- /* --- Default ------------------------------------------------------------- */
- # elif defined(FPM_DEFAULT)
- /*
- * This version is the most portable but it loses significant accuracy.
- * Furthermore, accuracy is biased against the second argument, so care
- * should be taken when ordering operands.
- *
- * The scale factors are constant as this is not used with SSO.
- *
- * Pre-rounding is required to stay within the limits of compliance.
- */
- # if defined(OPT_SPEED)
- # define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16))
- # else
- # define mad_f_mul(x, y) ((((x) + (1L << 11)) >> 12) *
- (((y) + (1L << 15)) >> 16))
- # endif
- /* ------------------------------------------------------------------------- */
- # else
- # error "no FPM selected"
- # endif
- /* default implementations */
- # if !defined(mad_f_mul)
- # define mad_f_mul(x, y)
- ({ register mad_fixed64hi_t __hi;
- register mad_fixed64lo_t __lo;
- MAD_F_MLX(__hi, __lo, (x), (y));
- mad_f_scale64(__hi, __lo);
- })
- # endif
- # if !defined(MAD_F_MLA)
- # define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y)))
- # define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y)))
- # define MAD_F_MLN(hi, lo) ((lo) = -(lo))
- # define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo))
- # endif
- # if !defined(MAD_F_ML0)
- # define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y))
- # endif
- # if !defined(MAD_F_MLN)
- # define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi))
- # endif
- # if !defined(MAD_F_MLZ)
- # define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo))
- # endif
- # if !defined(mad_f_scale64)
- # if defined(OPT_ACCURACY)
- # define mad_f_scale64(hi, lo)
- ((((mad_fixed_t)
- (((hi) << (32 - (MAD_F_SCALEBITS - 1))) |
- ((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1)
- # else
- # define mad_f_scale64(hi, lo)
- ((mad_fixed_t)
- (((hi) << (32 - MAD_F_SCALEBITS)) |
- ((lo) >> MAD_F_SCALEBITS)))
- # endif
- # define MAD_F_SCALEBITS MAD_F_FRACBITS
- # endif
- /* C routines */
- mad_fixed_t mad_f_abs(mad_fixed_t);
- mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t);
- # endif
- /* Id: bit.h,v 1.12 2004/01/23 09:41:32 rob Exp */
- # ifndef LIBMAD_BIT_H
- # define LIBMAD_BIT_H
- struct mad_bitptr {
- unsigned char const *byte;
- unsigned short cache;
- unsigned short left;
- };
- void mad_bit_init(struct mad_bitptr *, unsigned char const *);
- # define mad_bit_finish(bitptr) /* nothing */
- unsigned int mad_bit_length(struct mad_bitptr const *,
- struct mad_bitptr const *);
- # define mad_bit_bitsleft(bitptr) ((bitptr)->left)
- unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *);
- void mad_bit_skip(struct mad_bitptr *, unsigned int);
- unsigned long mad_bit_read(struct mad_bitptr *, unsigned int);
- void mad_bit_write(struct mad_bitptr *, unsigned int, unsigned long);
- unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short);
- # endif
- /* Id: timer.h,v 1.16 2004/01/23 09:41:33 rob Exp */
- # ifndef LIBMAD_TIMER_H
- # define LIBMAD_TIMER_H
- typedef struct {
- signed long seconds; /* whole seconds */
- unsigned long fraction; /* 1/MAD_TIMER_RESOLUTION seconds */
- } mad_timer_t;
- extern mad_timer_t const mad_timer_zero;
- # define MAD_TIMER_RESOLUTION 352800000UL
- enum mad_units {
- MAD_UNITS_HOURS = -2,
- MAD_UNITS_MINUTES = -1,
- MAD_UNITS_SECONDS = 0,
- /* metric units */
- MAD_UNITS_DECISECONDS = 10,
- MAD_UNITS_CENTISECONDS = 100,
- MAD_UNITS_MILLISECONDS = 1000,
- /* audio sample units */
- MAD_UNITS_8000_HZ = 8000,
- MAD_UNITS_11025_HZ = 11025,
- MAD_UNITS_12000_HZ = 12000,
- MAD_UNITS_16000_HZ = 16000,
- MAD_UNITS_22050_HZ = 22050,
- MAD_UNITS_24000_HZ = 24000,
- MAD_UNITS_32000_HZ = 32000,
- MAD_UNITS_44100_HZ = 44100,
- MAD_UNITS_48000_HZ = 48000,
- /* video frame/field units */
- MAD_UNITS_24_FPS = 24,
- MAD_UNITS_25_FPS = 25,
- MAD_UNITS_30_FPS = 30,
- MAD_UNITS_48_FPS = 48,
- MAD_UNITS_50_FPS = 50,
- MAD_UNITS_60_FPS = 60,
- /* CD audio frames */
- MAD_UNITS_75_FPS = 75,
- /* video drop-frame units */
- MAD_UNITS_23_976_FPS = -24,
- MAD_UNITS_24_975_FPS = -25,
- MAD_UNITS_29_97_FPS = -30,
- MAD_UNITS_47_952_FPS = -48,
- MAD_UNITS_49_95_FPS = -50,
- MAD_UNITS_59_94_FPS = -60
- };
- # define mad_timer_reset(timer) ((void) (*(timer) = mad_timer_zero))
- int mad_timer_compare(mad_timer_t, mad_timer_t);
- # define mad_timer_sign(timer) mad_timer_compare((timer), mad_timer_zero)
- void mad_timer_negate(mad_timer_t *);
- mad_timer_t mad_timer_abs(mad_timer_t);
- void mad_timer_set(mad_timer_t *, unsigned long, unsigned long, unsigned long);
- void mad_timer_add(mad_timer_t *, mad_timer_t);
- void mad_timer_multiply(mad_timer_t *, signed long);
- signed long mad_timer_count(mad_timer_t, enum mad_units);
- unsigned long mad_timer_fraction(mad_timer_t, unsigned long);
- void mad_timer_string(mad_timer_t, char *, char const *,
- enum mad_units, enum mad_units, unsigned long);
- # endif
- /* Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp */
- # ifndef LIBMAD_STREAM_H
- # define LIBMAD_STREAM_H
- # define MAD_BUFFER_GUARD 8
- # define MAD_BUFFER_MDLEN (511 + 2048 + MAD_BUFFER_GUARD)
- enum mad_error {
- MAD_ERROR_NONE = 0x0000, /* no error */
- MAD_ERROR_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
- MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
- MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
- MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
- MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
- MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
- MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
- MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
- MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
- MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
- MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
- MAD_ERROR_BADMODE = 0x0222, /* bad bitrate/mode combination */
- MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
- MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
- MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
- MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
- MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
- MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
- MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
- MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
- MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
- };
- # define MAD_RECOVERABLE(error) ((error) & 0xff00)
- struct mad_stream {
- unsigned char const *buffer; /* input bitstream buffer */
- unsigned char const *bufend; /* end of buffer */
- unsigned long skiplen; /* bytes to skip before next frame */
- int sync; /* stream sync found */
- unsigned long freerate; /* free bitrate (fixed) */
- unsigned char const *this_frame; /* start of current frame */
- unsigned char const *next_frame; /* start of next frame */
- struct mad_bitptr ptr; /* current processing bit pointer */
- struct mad_bitptr anc_ptr; /* ancillary bits pointer */
- unsigned int anc_bitlen; /* number of ancillary bits */
- unsigned char (*main_data)[MAD_BUFFER_MDLEN];
- /* Layer III main_data() */
- unsigned int md_len; /* bytes in main_data */
- int options; /* decoding options (see below) */
- enum mad_error error; /* error code (see above) */
- };
- enum {
- MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
- MAD_OPTION_HALFSAMPLERATE = 0x0002 /* generate PCM at 1/2 sample rate */
- # if 0 /* not yet implemented */
- MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
- MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
- MAD_OPTION_SINGLECHANNEL = 0x0030 /* combine channels */
- # endif
- };
- void mad_stream_init(struct mad_stream *);
- void mad_stream_finish(struct mad_stream *);
- # define mad_stream_options(stream, opts)
- ((void) ((stream)->options = (opts)))
- void mad_stream_buffer(struct mad_stream *,
- unsigned char const *, unsigned long);
- void mad_stream_skip(struct mad_stream *, unsigned long);
- int mad_stream_sync(struct mad_stream *);
- char const *mad_stream_errorstr(struct mad_stream const *);
- # endif
- /* Id: frame.h,v 1.20 2004/01/23 09:41:32 rob Exp */
- # ifndef LIBMAD_FRAME_H
- # define LIBMAD_FRAME_H
- enum mad_layer {
- MAD_LAYER_I = 1, /* Layer I */
- MAD_LAYER_II = 2, /* Layer II */
- MAD_LAYER_III = 3 /* Layer III */
- };
- enum mad_mode {
- MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */
- MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */
- MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */
- MAD_MODE_STEREO = 3 /* normal LR stereo */
- };
- enum mad_emphasis {
- MAD_EMPHASIS_NONE = 0, /* no emphasis */
- MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */
- MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */
- MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */
- };
- struct mad_header {
- enum mad_layer layer; /* audio layer (1, 2, or 3) */
- enum mad_mode mode; /* channel mode (see above) */
- int mode_extension; /* additional mode info */
- enum mad_emphasis emphasis; /* de-emphasis to use (see above) */
- unsigned long bitrate; /* stream bitrate (bps) */
- unsigned int samplerate; /* sampling frequency (Hz) */
- unsigned short crc_check; /* frame CRC accumulator */
- unsigned short crc_target; /* final target CRC checksum */
- int flags; /* flags (see below) */
- int private_bits; /* private bits (see below) */
- mad_timer_t duration; /* audio playing time of frame */
- };
- struct mad_frame {
- struct mad_header header; /* MPEG audio header */
- int options; /* decoding options (from stream) */
- mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
- mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
- };
- # define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)
- # define MAD_NSBSAMPLES(header)
- ((header)->layer == MAD_LAYER_I ? 12 :
- (((header)->layer == MAD_LAYER_III &&
- ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
- enum {
- MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */
- MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */
- MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */
- MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */
- MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */
- MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */
- MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */
- MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */
- MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */
- MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */
- MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */
- MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */
- };
- enum {
- MAD_PRIVATE_HEADER = 0x0100, /* header private bit */
- MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */
- };
- void mad_header_init(struct mad_header *);
- # define mad_header_finish(header) /* nothing */
- int mad_header_decode(struct mad_header *, struct mad_stream *);
- void mad_frame_init(struct mad_frame *);
- void mad_frame_finish(struct mad_frame *);
- int mad_frame_decode(struct mad_frame *, struct mad_stream *);
- void mad_frame_mute(struct mad_frame *);
- # endif
- /* Id: synth.h,v 1.15 2004/01/23 09:41:33 rob Exp */
- # ifndef LIBMAD_SYNTH_H
- # define LIBMAD_SYNTH_H
- struct mad_pcm {
- unsigned int samplerate; /* sampling frequency (Hz) */
- unsigned short channels; /* number of channels */
- unsigned short length; /* number of samples per channel */
- mad_fixed_t samples[2][1152]; /* PCM output samples [ch][sample] */
- };
- struct mad_synth {
- mad_fixed_t filter[2][2][2][16][8]; /* polyphase filterbank outputs */
- /* [ch][eo][peo][s][v] */
- unsigned int phase; /* current processing phase */
- struct mad_pcm pcm; /* PCM output */
- };
- /* single channel PCM selector */
- enum {
- MAD_PCM_CHANNEL_SINGLE = 0
- };
- /* dual channel PCM selector */
- enum {
- MAD_PCM_CHANNEL_DUAL_1 = 0,
- MAD_PCM_CHANNEL_DUAL_2 = 1
- };
- /* stereo PCM selector */
- enum {
- MAD_PCM_CHANNEL_STEREO_LEFT = 0,
- MAD_PCM_CHANNEL_STEREO_RIGHT = 1
- };
- void mad_synth_init(struct mad_synth *);
- # define mad_synth_finish(synth) /* nothing */
- void mad_synth_mute(struct mad_synth *);
- void mad_synth_frame(struct mad_synth *, struct mad_frame const *);
- # endif
- /* Id: decoder.h,v 1.17 2004/01/23 09:41:32 rob Exp */
- # ifndef LIBMAD_DECODER_H
- # define LIBMAD_DECODER_H
- enum mad_decoder_mode {
- MAD_DECODER_MODE_SYNC = 0,
- MAD_DECODER_MODE_ASYNC
- };
- enum mad_flow {
- MAD_FLOW_CONTINUE = 0x0000, /* continue normally */
- MAD_FLOW_STOP = 0x0010, /* stop decoding normally */
- MAD_FLOW_BREAK = 0x0011, /* stop decoding and signal an error */
- MAD_FLOW_IGNORE = 0x0020 /* ignore the current frame */
- };
- struct mad_decoder {
- enum mad_decoder_mode mode;
- int options;
- struct {
- long pid;
- int in;
- int out;
- } async;
- struct {
- struct mad_stream stream;
- struct mad_frame frame;
- struct mad_synth synth;
- } *sync;
- void *cb_data;
- enum mad_flow (*input_func)(void *, struct mad_stream *);
- enum mad_flow (*header_func)(void *, struct mad_header const *);
- enum mad_flow (*filter_func)(void *,
- struct mad_stream const *, struct mad_frame *);
- enum mad_flow (*output_func)(void *,
- struct mad_header const *, struct mad_pcm *);
- enum mad_flow (*error_func)(void *, struct mad_stream *, struct mad_frame *);
- enum mad_flow (*message_func)(void *, void *, unsigned int *);
- };
- void mad_decoder_init(struct mad_decoder *, void *,
- enum mad_flow (*)(void *, struct mad_stream *),
- enum mad_flow (*)(void *, struct mad_header const *),
- enum mad_flow (*)(void *,
- struct mad_stream const *,
- struct mad_frame *),
- enum mad_flow (*)(void *,
- struct mad_header const *,
- struct mad_pcm *),
- enum mad_flow (*)(void *,
- struct mad_stream *,
- struct mad_frame *),
- enum mad_flow (*)(void *, void *, unsigned int *));
- int mad_decoder_finish(struct mad_decoder *);
- # define mad_decoder_options(decoder, opts)
- ((void) ((decoder)->options = (opts)))
- int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
- int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);
- # endif
- # ifdef __cplusplus
- }
- # endif