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ffmpeg/libavutil/internal.h
Vitor Sessak 6b7c7703f4 Add replacements for log2f(), exp2() and exp2f() for platforms that lacks it. 
Should fix build breakage on some platforms introduced in r21125.

Originally committed as revision 21155 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-01-12 02:19:51 +00:00

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/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavutil/internal.h
* common internal API header
*/
#ifndef AVUTIL_INTERNAL_H
#define AVUTIL_INTERNAL_H
#if !defined(DEBUG) && !defined(NDEBUG)
# define NDEBUG
#endif
#include <limits.h>
#include <stdint.h>
#include <stddef.h>
#include <assert.h>
#include "config.h"
#include "common.h"
#include "mem.h"
#include "timer.h"
#ifndef attribute_align_arg
#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,2)
# define attribute_align_arg __attribute__((force_align_arg_pointer))
#else
# define attribute_align_arg
#endif
#endif
#ifndef attribute_used
#if AV_GCC_VERSION_AT_LEAST(3,1)
# define attribute_used __attribute__((used))
#else
# define attribute_used
#endif
#endif
#ifndef INT16_MIN
#define INT16_MIN (-0x7fff - 1)
#endif
#ifndef INT16_MAX
#define INT16_MAX 0x7fff
#endif
#ifndef INT32_MIN
#define INT32_MIN (-0x7fffffff - 1)
#endif
#ifndef INT32_MAX
#define INT32_MAX 0x7fffffff
#endif
#ifndef UINT32_MAX
#define UINT32_MAX 0xffffffff
#endif
#ifndef INT64_MIN
#define INT64_MIN (-0x7fffffffffffffffLL - 1)
#endif
#ifndef INT64_MAX
#define INT64_MAX INT64_C(9223372036854775807)
#endif
#ifndef UINT64_MAX
#define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
#endif
#ifndef INT_BIT
# define INT_BIT (CHAR_BIT * sizeof(int))
#endif
#ifndef offsetof
# define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
#endif
/* Use to export labels from asm. */
#define LABEL_MANGLE(a) EXTERN_PREFIX #a
// Use rip-relative addressing if compiling PIC code on x86-64.
#if ARCH_X86_64 && defined(PIC)
# define LOCAL_MANGLE(a) #a "(%%rip)"
#else
# define LOCAL_MANGLE(a) #a
#endif
#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
/* debug stuff */
/* dprintf macros */
#ifdef DEBUG
# define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
#else
# define dprintf(pctx, ...)
#endif
#define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
/* math */
extern const uint32_t ff_inverse[257];
#if ARCH_X86
# define FASTDIV(a,b) \
({\
int ret, dmy;\
__asm__ volatile(\
"mull %3"\
:"=d"(ret), "=a"(dmy)\
:"1"(a), "g"(ff_inverse[b])\
);\
ret;\
})
#elif HAVE_ARMV6 && HAVE_INLINE_ASM
static inline av_const int FASTDIV(int a, int b)
{
int r, t;
__asm__ volatile("cmp %3, #2 \n\t"
"ldr %1, [%4, %3, lsl #2] \n\t"
"lsrle %0, %2, #1 \n\t"
"smmulgt %0, %1, %2 \n\t"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
return r;
}
#elif ARCH_ARM && HAVE_INLINE_ASM
static inline av_const int FASTDIV(int a, int b)
{
int r, t;
__asm__ volatile("umull %1, %0, %2, %3"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
return r;
}
#elif CONFIG_FASTDIV
# define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
#else
# define FASTDIV(a,b) ((a) / (b))
#endif
extern const uint8_t ff_sqrt_tab[256];
static inline av_const unsigned int ff_sqrt(unsigned int a)
{
unsigned int b;
if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4;
else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2;
#if !CONFIG_SMALL
else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1;
else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8] ;
#endif
else {
int s = av_log2_16bit(a >> 16) >> 1;
unsigned int c = a >> (s + 2);
b = ff_sqrt_tab[c >> (s + 8)];
b = FASTDIV(c,b) + (b << s);
}
return b - (a < b * b);
}
#if ARCH_X86
#define MASK_ABS(mask, level)\
__asm__ volatile(\
"cltd \n\t"\
"xorl %1, %0 \n\t"\
"subl %1, %0 \n\t"\
: "+a" (level), "=&d" (mask)\
);
#else
#define MASK_ABS(mask, level)\
mask = level >> 31;\
level = (level ^ mask) - mask;
#endif
#if HAVE_CMOV
#define COPY3_IF_LT(x, y, a, b, c, d)\
__asm__ volatile(\
"cmpl %0, %3 \n\t"\
"cmovl %3, %0 \n\t"\
"cmovl %4, %1 \n\t"\
"cmovl %5, %2 \n\t"\
: "+&r" (x), "+&r" (a), "+r" (c)\
: "r" (y), "r" (b), "r" (d)\
);
#else
#define COPY3_IF_LT(x, y, a, b, c, d)\
if ((y) < (x)) {\
(x) = (y);\
(a) = (b);\
(c) = (d);\
}
#endif
/* avoid usage of dangerous/inappropriate system functions */
#undef malloc
#define malloc please_use_av_malloc
#undef free
#define free please_use_av_free
#undef realloc
#define realloc please_use_av_realloc
#undef time
#define time time_is_forbidden_due_to_security_issues
#undef rand
#define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
#undef srand
#define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
#undef random
#define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
#undef sprintf
#define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
#undef strcat
#define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
#undef exit
#define exit exit_is_forbidden
#ifndef LIBAVFORMAT_BUILD
#undef printf
#define printf please_use_av_log_instead_of_printf
#undef fprintf
#define fprintf please_use_av_log_instead_of_fprintf
#undef puts
#define puts please_use_av_log_instead_of_puts
#undef perror
#define perror please_use_av_log_instead_of_perror
#endif
#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
{\
p = av_malloc(size);\
if (p == NULL && (size) != 0) {\
av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
goto label;\
}\
}
#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
{\
p = av_mallocz(size);\
if (p == NULL && (size) != 0) {\
av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
goto label;\
}\
}
#if !HAVE_EXP2
static av_always_inline av_const double exp2(double x)
{
return exp(x * 0.693147180559945);
}
#endif /* HAVE_EXP2 */
#if !HAVE_EXP2F
static av_always_inline av_const float exp2f(float x)
{
return exp2(x);
}
#endif /* HAVE_EXP2F */
#if !HAVE_LLRINT
static av_always_inline av_const long long llrint(double x)
{
return rint(x);
}
#endif /* HAVE_LLRINT */
#if !HAVE_LOG2
static av_always_inline av_const double log2(double x)
{
return log(x) * 1.44269504088896340736;
}
#endif /* HAVE_LOG2 */
#if !HAVE_LOG2F
static av_always_inline av_const float log2f(float x)
{
return log2(x);
}
#endif /* HAVE_LOG2F */
#if !HAVE_LRINT
static av_always_inline av_const long int lrint(double x)
{
return rint(x);
}
#endif /* HAVE_LRINT */
#if !HAVE_LRINTF
static av_always_inline av_const long int lrintf(float x)
{
return (int)(rint(x));
}
#endif /* HAVE_LRINTF */
#if !HAVE_ROUND
static av_always_inline av_const double round(double x)
{
return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
}
#endif /* HAVE_ROUND */
#if !HAVE_ROUNDF
static av_always_inline av_const float roundf(float x)
{
return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
}
#endif /* HAVE_ROUNDF */
#if !HAVE_TRUNCF
static av_always_inline av_const float truncf(float x)
{
return (x > 0) ? floor(x) : ceil(x);
}
#endif /* HAVE_TRUNCF */
/**
* Returns NULL if CONFIG_SMALL is true, otherwise the argument
* without modification. Used to disable the definition of strings
* (for example AVCodec long_names).
*/
#if CONFIG_SMALL
# define NULL_IF_CONFIG_SMALL(x) NULL
#else
# define NULL_IF_CONFIG_SMALL(x) x
#endif
#endif /* AVUTIL_INTERNAL_H */
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