common.h

/**
 * Flake: FLAC audio encoder
 * Copyright (c) 2006-2007 Justin Ruggles
 *
 * STOP/START_TIMER is from FFmpeg libavutil/common.h
 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * Flake 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.
 *
 * Flake 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 Flake; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file common.h
 * Common header file
 */

#ifndef COMMON_H
#define COMMON_H

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <inttypes.h>

#include <math.h>
#ifndef M_PI
#define M_PI  3.14159265358979323846
#endif
#ifndef M_SQRT2
#define M_SQRT2 1.41421356237309504880
#endif

#define ABS(a) ((a) >= 0 ? (a) : (-(a)))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define MIN(a,b) ((a) > (b) ? (b) : (a))
#define CLIP(x,min,max) MAX(MIN((x), (max)), (min))

static inline int
log2i(uint32_t v)
{
    unsigned int i;
    int n = 0;
    if(v & 0xffff0000){ v >>= 16; n += 16; }
    if(v & 0xff00){ v >>= 8; n += 8; }
    for(i=2; i<256; i<<=1) {
        if(v >= i) n++;
        else break;
    }
    return n;
}

#include <string.h>

// strnlen is a GNU extention. providing implementation if needed.
#ifndef HAVE_STRNLEN
static inline size_t
strnlen(const char *s, size_t maxlen)
{
    size_t i = 0;
    while((s[i] != '\0') && (i < maxlen)) i++;
    return i;
}
#elif !defined(__USE_GNU)
extern size_t strnlen(const char *s, size_t maxlen);
#endif


#if 0 /* TIMER USED FOR TESTING */
static inline long long read_time(void)
{
    union {
        long x1[2];
        long long x;
    } l;
    __asm__ __volatile__("rdtsc"
                 : "=a" (l.x1[0]),
                   "=d" (l.x1[1]));
    return l.x;
}

#define START_TIMER \
uint64_t tend;\
uint64_t tstart = read_time();\

#define STOP_TIMER(id) \
tend= read_time();\
{\
    static uint64_t tsum=0;\
    static int tcount=0;\
    static int tskip_count=0;\
    if(tcount<2 || tend - tstart < MAX(8*tsum/tcount, 2000)){\
        tsum+= tend - tstart;\
        tcount++;\
    }else\
        tskip_count++;\
    if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
        fprintf(stderr, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\
               tsum*10/tcount, id, tcount, tskip_count);\
    }\
}
#endif

#endif /* COMMON_H */