mpg123lib_intern.h

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/*
    mpg123lib_intern: Common non-public stuff for libmpg123

    copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
    see COPYING and AUTHORS files in distribution or http://mpg123.org

    derived from the old mpg123.h
*/

#ifndef MPG123_H_INTERN
#define MPG123_H_INTERN

#define MPG123_RATES 9
#define MPG123_ENCODINGS 12

#include "config.h" /* Load this before _anything_ */
#include "intsym.h" /* Prefixing of internal symbols that still are public in a static lib. */

#include "abi_align.h"

/* export DLL symbols */
#if defined(WIN32) && defined(DYNAMIC_BUILD)
#define BUILD_MPG123_DLL
#endif
#include "compat.h"
#include "mpg123.h"

#define SKIP_JUNK 1

#ifndef M_PI
# define M_PI       3.14159265358979323846
#endif
#ifndef M_SQRT2
# define M_SQRT2    1.41421356237309504880
#endif

#ifdef SUNOS
#define memmove(dst,src,size) bcopy(src,dst,size)
#endif

/* We don't really do long double... there are 3 options for REAL:
   float, long and double. */

#ifdef REAL_IS_FLOAT
#  define real float
#elif defined(REAL_IS_FIXED)

# define real  int32_t
# define dreal int64_t

/*
  for fixed-point decoders, use pre-calculated tables to avoid expensive floating-point maths
  undef this macro for run-time calculation
*/
#define PRECALC_TABLES

# define REAL_RADIX             24
# define REAL_FACTOR            16777216.0

static inline int32_t double_to_long_rounded(double x, double scalefac)
{
    x *= scalefac;
    x += (x > 0) ? 0.5 : -0.5;
    return (int32_t)x;
}

static inline int32_t scale_rounded(int32_t x, int shift)
{
    x += (x >> 31);
    x >>= (shift - 1);
    x += (x & 1);
    return (x >> 1);
}

# ifdef __GNUC__
#  if defined(OPT_I386)
/* for i386_nofpu decoder */
#   define REAL_MUL_ASM(x, y, radix) \
({ \
    long _x=(x), _y=(y); \
    __asm__ ( \
        "imull %1 \n\t" \
        "shrdl %2, %%edx, %0 \n\t" \
        : "+&a" (_x) \
        : "mr" (_y), "I" (radix) \
        : "%edx", "cc" \
    ); \
    _x; \
})

#   define REAL_MUL_SCALE_LAYER3_ASM(x, y, radix) \
({ \
    long _x=(x), _y=(y), _radix=(radix); \
    __asm__ ( \
        "imull %1 \n\t" \
        "shrdl %%cl, %%edx, %0 \n\t" \
        : "+&a" (_x) \
        : "mr" (_y), "c" (_radix) \
        : "%edx", "cc" \
    ); \
    _x; \
})
#  elif defined(OPT_PPC)
/* for powerpc */
#   define REAL_MUL_ASM(x, y, radix) \
({ \
    long _x=(x), _y=(y), _mull, _mulh; \
    __asm__ ( \
        "mullw %0, %2, %3 \n\t" \
        "mulhw %1, %2, %3 \n\t" \
        "srwi %0, %0, %4 \n\t" \
        "rlwimi %0, %1, %5, 0, %6 \n\t" \
        : "=&r" (_mull), "=&r" (_mulh) \
        : "r" (_x), "r" (_y), "i" (radix), "i" (32-(radix)), "i" ((radix)-1) \
    ); \
    _mull; \
})

#   define REAL_MUL_SCALE_LAYER3_ASM(x, y, radix) \
({ \
    long _x=(x), _y=(y), _radix=(radix), _mull, _mulh, _radix2; \
    __asm__ ( \
        "mullw %0, %3, %4 \n\t" \
        "mulhw %1, %3, %4 \n\t" \
        "subfic %2, %5, 32 \n\t" \
        "srw %0, %0, %5 \n\t" \
        "slw %1, %1, %2 \n\t" \
        "or %0, %0, %1 \n\t" \
        : "=&r" (_mull), "=&r" (_mulh), "=&r" (_radix2) \
        : "r" (_x), "r" (_y), "r" (_radix) \
        : "cc" \
    ); \
    _mull; \
})
#  elif defined(OPT_ARM)
/* for arm */
#   define REAL_MUL_ASM(x, y, radix) \
({ \
    long _x=(x), _y=(y), _mull, _mulh; \
    __asm__ ( \
        "smull %0, %1, %2, %3 \n\t" \
        "mov %0, %0, lsr %4 \n\t" \
        "orr %0, %0, %1, lsl %5 \n\t" \
        : "=&r" (_mull), "=&r" (_mulh) \
        : "r" (_x), "r" (_y), "M" (radix), "M" (32-(radix)) \
    ); \
    _mull; \
})

#   define REAL_MUL_SCALE_LAYER3_ASM(x, y, radix) \
({ \
    long _x=(x), _y=(y), _radix=(radix), _mull, _mulh, _radix2; \
    __asm__ ( \
        "smull %0, %1, %3, %4 \n\t" \
        "mov %0, %0, lsr %5 \n\t" \
        "rsb %2, %5, #32 \n\t" \
        "mov %1, %1, lsl %2 \n\t" \
        "orr %0, %0, %1 \n\t" \
        : "=&r" (_mull), "=&r" (_mulh), "=&r" (_radix2) \
        : "r" (_x), "r" (_y), "r" (_radix) \
    ); \
    _mull; \
})
#  endif
# endif

/* I just changed the (int) to (real) there... seemed right. */
# define DOUBLE_TO_REAL(x)                  (double_to_long_rounded(x, REAL_FACTOR))
# define DOUBLE_TO_REAL_15(x)               (double_to_long_rounded(x, 32768.0))
# define DOUBLE_TO_REAL_POW43(x)            (double_to_long_rounded(x, 8192.0))
# define DOUBLE_TO_REAL_SCALE_LAYER12(x)    (double_to_long_rounded(x, 1073741824.0))
# define DOUBLE_TO_REAL_SCALE_LAYER3(x, y)  (double_to_long_rounded(x, pow(2.0,gainpow2_scale[y])))
# define REAL_TO_DOUBLE(x)                  ((double)(x) / REAL_FACTOR)
# ifdef REAL_MUL_ASM
#  define REAL_MUL(x, y)                    REAL_MUL_ASM(x, y, REAL_RADIX)
#  define REAL_MUL_15(x, y)                 REAL_MUL_ASM(x, y, 15)
#  define REAL_MUL_SCALE_LAYER12(x, y)      REAL_MUL_ASM(x, y, 15 + 30 - REAL_RADIX)
# else
#  define REAL_MUL(x, y)                    (((dreal)(x) * (dreal)(y)) >> REAL_RADIX)
#  define REAL_MUL_15(x, y)                 (((dreal)(x) * (dreal)(y)) >> 15)
#  define REAL_MUL_SCALE_LAYER12(x, y)      (((dreal)(x) * (dreal)(y)) >> (15 + 30 - REAL_RADIX))
# endif
# ifdef REAL_MUL_SCALE_LAYER3_ASM
#  define REAL_MUL_SCALE_LAYER3(x, y, z)    REAL_MUL_SCALE_LAYER3_ASM(x, y, 13 + gainpow2_scale[z] - REAL_RADIX)
# else
#  define REAL_MUL_SCALE_LAYER3(x, y, z)    (((dreal)(x) * (dreal)(y)) >> (13 + gainpow2_scale[z] - REAL_RADIX))
# endif
# define REAL_SCALE_LAYER12(x)              ((real)((x) >> (30 - REAL_RADIX)))
# define REAL_SCALE_LAYER3(x, y)            ((real)((x) >> (gainpow2_scale[y] - REAL_RADIX)))
# ifdef ACCURATE_ROUNDING
#  define REAL_MUL_SYNTH(x, y)              REAL_MUL(x, y)
#  define REAL_SCALE_DCT64(x)               (x)
#  define REAL_SCALE_WINDOW(x)              (x)
# else
#  define REAL_MUL_SYNTH(x, y)              ((x) * (y))
#  define REAL_SCALE_DCT64(x)               ((x) >> 8)
#  define REAL_SCALE_WINDOW(x)              scale_rounded(x, 16)
# endif

#else
/* Just define a symbol to make things clear.
   Existing code still uses (not (float or fixed)) for that. */
#  define REAL_IS_DOUBLE
#  define real double
#endif

#ifndef REAL_IS_FIXED
# if (defined SIZEOF_INT32_T) && (SIZEOF_INT32_T != 4)
#  error "Bad 32bit types!!!"
# endif
#endif

#ifndef DOUBLE_TO_REAL
# define DOUBLE_TO_REAL(x)                  (real)(x)
#endif
#ifndef DOUBLE_TO_REAL_15
# define DOUBLE_TO_REAL_15(x)               (real)(x)
#endif
#ifndef DOUBLE_TO_REAL_POW43
# define DOUBLE_TO_REAL_POW43(x)            (real)(x)
#endif
#ifndef DOUBLE_TO_REAL_SCALE_LAYER12
# define DOUBLE_TO_REAL_SCALE_LAYER12(x)    (real)(x)
#endif
#ifndef DOUBLE_TO_REAL_SCALE_LAYER3
# define DOUBLE_TO_REAL_SCALE_LAYER3(x, y)  (real)(x)
#endif
#ifndef REAL_TO_DOUBLE
# define REAL_TO_DOUBLE(x)                  (x)
#endif

#ifndef REAL_MUL
# define REAL_MUL(x, y)                     ((x) * (y))
#endif
#ifndef REAL_MUL_SYNTH
# define REAL_MUL_SYNTH(x, y)               ((x) * (y))
#endif
#ifndef REAL_MUL_15
# define REAL_MUL_15(x, y)                  ((x) * (y))
#endif
#ifndef REAL_MUL_SCALE_LAYER12
# define REAL_MUL_SCALE_LAYER12(x, y)       ((x) * (y))
#endif
#ifndef REAL_MUL_SCALE_LAYER3
# define REAL_MUL_SCALE_LAYER3(x, y, z)     ((x) * (y))
#endif
#ifndef REAL_SCALE_LAYER12
# define REAL_SCALE_LAYER12(x)              (x)
#endif
#ifndef REAL_SCALE_LAYER3
# define REAL_SCALE_LAYER3(x, y)            (x)
#endif
#ifndef REAL_SCALE_DCT64
# define REAL_SCALE_DCT64(x)                (x)
#endif

/* used to be: AUDIOBUFSIZE = n*64 with n=1,2,3 ...
   now: factor on minimum frame buffer size (which takes upsampling into account) */
#define     AUDIOBUFSIZE        2

#include "true.h"

#define         MAX_NAME_SIZE           81
#define         SBLIMIT                 32
#define         SCALE_BLOCK             12
#define         SSLIMIT                 18

/* Same as MPG_M_* */
#define         MPG_MD_STEREO           0
#define         MPG_MD_JOINT_STEREO     1
#define         MPG_MD_DUAL_CHANNEL     2
#define         MPG_MD_MONO             3

/* We support short or float output samples...
   Short integer amplitude is scaled by this. */
#define SHORT_SCALE 32768
/* That scales a short-scaled value to a 32bit integer scaled one
   value = 2**31/2**15 */
#define S32_RESCALE 65536

/* Pre Shift fo 16 to 8 bit converter table */
#define AUSHIFT (3)

#include "optimize.h"
#include "decode.h"
#include "parse.h"
#include "frame.h"

/* fr is a mpg123_handle* by convention here... */
#define NOQUIET  (!(fr->p.flags & MPG123_QUIET))
#define VERBOSE  (NOQUIET && fr->p.verbose)
#define VERBOSE2 (NOQUIET && fr->p.verbose > 1)
#define VERBOSE3 (NOQUIET && fr->p.verbose > 2)
#define VERBOSE4 (NOQUIET && fr->p.verbose > 3)
#define PVERB(mp, level) (!((mp)->flags & MPG123_QUIET) && (mp)->verbose >= (level))

int decode_update(mpg123_handle *mh);
/* residing in format.c  */
off_t decoder_synth_bytes(mpg123_handle *fr , off_t s);
off_t samples_to_bytes(mpg123_handle *fr , off_t s);
off_t bytes_to_samples(mpg123_handle *fr , off_t b);
off_t outblock_bytes(mpg123_handle *fr, off_t s);
/* Postprocessing format conversion of freshly decoded buffer. */
void postprocess_buffer(mpg123_handle *fr);

int open_fixed_pre(mpg123_handle *mh, int channels, int encoding);
int open_fixed_post(mpg123_handle *mh, int channels, int encoding);

/* If networking is enabled and we really mean internal networking, the timeout_read function is available. */
#if defined (NETWORK) && !defined (WANT_WIN32_SOCKETS)
/* Does not work with win32 */
#define TIMEOUT_READ
#endif

#endif