Statistics
| Branch: | Revision:

ffmpeg / libavutil / common.h @ 27af15dc

History | View | Annotate | Download (9.24 KB)

1
/*
2
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20

    
21
/**
22
 * @file common.h
23
 * common internal and external api header.
24
 */
25

    
26
#ifndef FFMPEG_COMMON_H
27
#define FFMPEG_COMMON_H
28

    
29
#include <inttypes.h>
30

    
31
#ifdef HAVE_AV_CONFIG_H
32
/* only include the following when compiling package */
33
#    include "config.h"
34

    
35
#    include <stdlib.h>
36
#    include <stdio.h>
37
#    include <string.h>
38
#    include <ctype.h>
39
#    include <limits.h>
40
#    include <errno.h>
41
#    include <math.h>
42
#endif /* HAVE_AV_CONFIG_H */
43

    
44
#ifndef av_always_inline
45
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
46
#    define av_always_inline __attribute__((always_inline)) inline
47
#else
48
#    define av_always_inline inline
49
#endif
50
#endif
51

    
52
#ifndef av_noinline
53
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
54
#    define av_noinline __attribute__((noinline))
55
#else
56
#    define av_noinline
57
#endif
58
#endif
59

    
60
#ifdef HAVE_AV_CONFIG_H
61
#    include "internal.h"
62
#endif /* HAVE_AV_CONFIG_H */
63

    
64
#ifndef attribute_deprecated
65
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
66
#    define attribute_deprecated __attribute__((deprecated))
67
#else
68
#    define attribute_deprecated
69
#endif
70
#endif
71

    
72
#ifndef av_unused
73
#if defined(__GNUC__)
74
#    define av_unused __attribute__((unused))
75
#else
76
#    define av_unused
77
#endif
78
#endif
79

    
80
#include "mem.h"
81

    
82
//rounded divison & shift
83
#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
84
/* assume b>0 */
85
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
86
#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
87
#define FFSIGN(a) ((a) > 0 ? 1 : -1)
88

    
89
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
90
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
91

    
92
#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
93

    
94
/* misc math functions */
95
extern const uint8_t ff_log2_tab[256];
96

    
97
static inline int av_log2(unsigned int v)
98
{
99
    int n = 0;
100
    if (v & 0xffff0000) {
101
        v >>= 16;
102
        n += 16;
103
    }
104
    if (v & 0xff00) {
105
        v >>= 8;
106
        n += 8;
107
    }
108
    n += ff_log2_tab[v];
109

    
110
    return n;
111
}
112

    
113
static inline int av_log2_16bit(unsigned int v)
114
{
115
    int n = 0;
116
    if (v & 0xff00) {
117
        v >>= 8;
118
        n += 8;
119
    }
120
    n += ff_log2_tab[v];
121

    
122
    return n;
123
}
124

    
125
/* median of 3 */
126
static inline int mid_pred(int a, int b, int c)
127
{
128
#ifdef HAVE_CMOV
129
    int i=b;
130
    asm volatile(
131
        "cmp    %2, %1 \n\t"
132
        "cmovg  %1, %0 \n\t"
133
        "cmovg  %2, %1 \n\t"
134
        "cmp    %3, %1 \n\t"
135
        "cmovl  %3, %1 \n\t"
136
        "cmp    %1, %0 \n\t"
137
        "cmovg  %1, %0 \n\t"
138
        :"+&r"(i), "+&r"(a)
139
        :"r"(b), "r"(c)
140
    );
141
    return i;
142
#elif 0
143
    int t= (a-b)&((a-b)>>31);
144
    a-=t;
145
    b+=t;
146
    b-= (b-c)&((b-c)>>31);
147
    b+= (a-b)&((a-b)>>31);
148

    
149
    return b;
150
#else
151
    if(a>b){
152
        if(c>b){
153
            if(c>a) b=a;
154
            else    b=c;
155
        }
156
    }else{
157
        if(b>c){
158
            if(c>a) b=c;
159
            else    b=a;
160
        }
161
    }
162
    return b;
163
#endif
164
}
165

    
166
/**
167
 * clip a signed integer value into the amin-amax range
168
 * @param a value to clip
169
 * @param amin minimum value of the clip range
170
 * @param amax maximum value of the clip range
171
 * @return clipped value
172
 */
173
static inline int av_clip(int a, int amin, int amax)
174
{
175
    if      (a < amin) return amin;
176
    else if (a > amax) return amax;
177
    else               return a;
178
}
179

    
180
/**
181
 * clip a signed integer value into the 0-255 range
182
 * @param a value to clip
183
 * @return clipped value
184
 */
185
static inline uint8_t av_clip_uint8(int a)
186
{
187
    if (a&(~255)) return (-a)>>31;
188
    else          return a;
189
}
190

    
191
/**
192
 * clip a signed integer value into the -32768,32767 range
193
 * @param a value to clip
194
 * @return clipped value
195
 */
196
static inline int16_t av_clip_int16(int a)
197
{
198
    if ((a+32768) & ~65535) return (a>>31) ^ 32767;
199
    else                    return a;
200
}
201

    
202
/* math */
203
int64_t ff_gcd(int64_t a, int64_t b);
204

    
205
/**
206
 * converts fourcc string to int
207
 */
208
static inline int ff_get_fourcc(const char *s){
209
#ifdef HAVE_AV_CONFIG_H
210
    assert( strlen(s)==4 );
211
#endif
212

    
213
    return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
214
}
215

    
216
#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
217
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
218

    
219
/*!
220
 * \def GET_UTF8(val, GET_BYTE, ERROR)
221
 * converts a UTF-8 character (up to 4 bytes long) to its 32-bit UCS-4 encoded form
222
 * \param val is the output and should be of type uint32_t. It holds the converted
223
 * UCS-4 character and should be a left value.
224
 * \param GET_BYTE gets UTF-8 encoded bytes from any proper source. It can be
225
 * a function or a statement whose return value or evaluated value is of type
226
 * uint8_t. It will be executed up to 4 times for values in the valid UTF-8 range,
227
 * and up to 7 times in the general case.
228
 * \param ERROR action that should be taken when an invalid UTF-8 byte is returned
229
 * from GET_BYTE. It should be a statement that jumps out of the macro,
230
 * like exit(), goto, return, break, or continue.
231
 */
232
#define GET_UTF8(val, GET_BYTE, ERROR)\
233
    val= GET_BYTE;\
234
    {\
235
        int ones= 7 - av_log2(val ^ 255);\
236
        if(ones==1)\
237
            ERROR\
238
        val&= 127>>ones;\
239
        while(--ones > 0){\
240
            int tmp= GET_BYTE - 128;\
241
            if(tmp>>6)\
242
                ERROR\
243
            val= (val<<6) + tmp;\
244
        }\
245
    }
246

    
247
/*!
248
 * \def PUT_UTF8(val, tmp, PUT_BYTE)
249
 * converts a 32-bit unicode character to its UTF-8 encoded form (up to 4 bytes long).
250
 * \param val is an input only argument and should be of type uint32_t. It holds
251
 * a ucs4 encoded unicode character that is to be converted to UTF-8. If
252
 * val is given as a function it's executed only once.
253
 * \param tmp is a temporary variable and should be of type uint8_t. It
254
 * represents an intermediate value during conversion that is to be
255
 * outputted by PUT_BYTE.
256
 * \param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
257
 * It could be a function or a statement, and uses tmp as the input byte.
258
 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
259
 * executed up to 4 times for values in the valid UTF-8 range and up to
260
 * 7 times in the general case, depending on the length of the converted
261
 * unicode character.
262
 */
263
#define PUT_UTF8(val, tmp, PUT_BYTE)\
264
    {\
265
        int bytes, shift;\
266
        uint32_t in = val;\
267
        if (in < 0x80) {\
268
            tmp = in;\
269
            PUT_BYTE\
270
        } else {\
271
            bytes = (av_log2(in) + 4) / 5;\
272
            shift = (bytes - 1) * 6;\
273
            tmp = (256 - (256 >> bytes)) | (in >> shift);\
274
            PUT_BYTE\
275
            while (shift >= 6) {\
276
                shift -= 6;\
277
                tmp = 0x80 | ((in >> shift) & 0x3f);\
278
                PUT_BYTE\
279
            }\
280
        }\
281
    }
282

    
283
#if defined(ARCH_X86) || defined(ARCH_POWERPC) || defined(ARCH_BFIN)
284
#define AV_READ_TIME read_time
285
#if defined(ARCH_X86_64)
286
static inline uint64_t read_time(void)
287
{
288
    uint64_t a, d;
289
    asm volatile("rdtsc\n\t"
290
                 : "=a" (a), "=d" (d));
291
    return (d << 32) | (a & 0xffffffff);
292
}
293
#elif defined(ARCH_X86_32)
294
static inline long long read_time(void)
295
{
296
    long long l;
297
    asm volatile("rdtsc\n\t"
298
                 : "=A" (l));
299
    return l;
300
}
301
#elif ARCH_BFIN
302
static inline uint64_t read_time(void)
303
{
304
    union {
305
        struct {
306
            unsigned lo;
307
            unsigned hi;
308
        } p;
309
        unsigned long long c;
310
    } t;
311
    asm volatile ("%0=cycles; %1=cycles2;" : "=d" (t.p.lo), "=d" (t.p.hi));
312
    return t.c;
313
}
314
#else //FIXME check ppc64
315
static inline uint64_t read_time(void)
316
{
317
    uint32_t tbu, tbl, temp;
318

    
319
     /* from section 2.2.1 of the 32-bit PowerPC PEM */
320
     __asm__ __volatile__(
321
         "1:\n"
322
         "mftbu  %2\n"
323
         "mftb   %0\n"
324
         "mftbu  %1\n"
325
         "cmpw   %2,%1\n"
326
         "bne    1b\n"
327
     : "=r"(tbl), "=r"(tbu), "=r"(temp)
328
     :
329
     : "cc");
330

    
331
     return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
332
}
333
#endif
334
#elif defined(HAVE_GETHRTIME)
335
#define AV_READ_TIME gethrtime
336
#endif
337

    
338
#ifdef AV_READ_TIME
339
#define START_TIMER \
340
uint64_t tend;\
341
uint64_t tstart= AV_READ_TIME();\
342

    
343
#define STOP_TIMER(id) \
344
tend= AV_READ_TIME();\
345
{\
346
    static uint64_t tsum=0;\
347
    static int tcount=0;\
348
    static int tskip_count=0;\
349
    if(tcount<2 || tend - tstart < FFMAX(8*tsum/tcount, 2000)){\
350
        tsum+= tend - tstart;\
351
        tcount++;\
352
    }else\
353
        tskip_count++;\
354
    if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
355
        av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\
356
               tsum*10/tcount, id, tcount, tskip_count);\
357
    }\
358
}
359
#else
360
#define START_TIMER
361
#define STOP_TIMER(id) {}
362
#endif
363

    
364
#endif /* FFMPEG_COMMON_H */