1 /*

2 * utils for libavcodec

3 * Copyright (c) 2001 Fabrice Bellard

4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg is free software; you can redistribute it and/or

9 * modify it under the terms of the GNU Lesser General Public

10 * License as published by the Free Software Foundation; either

11 * version 2.1 of the License, or (at your option) any later version.

12 *

13 * FFmpeg is distributed in the hope that it will be useful,

14 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

16 * Lesser General Public License for more details.

17 *

18 * You should have received a copy of the GNU Lesser General Public

19 * License along with FFmpeg; if not, write to the Free Software

20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

21 */

22

23 /**

24 * @file

25 * utils.

26 */

27

28 /* needed for mkstemp() */

29 #define _XOPEN_SOURCE 600

30

31 #include "avcodec.h"

32 #include "dsputil.h"

33

34 #include <stdlib.h>

35 #include <stdarg.h>

36 #include <limits.h>

37 #include <float.h>

38 //#undef NDEBUG

39 #include <assert.h>

40

41 #include <fcntl.h>

42

43 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)

44 {

45 if(min_size < *size)

46 return ptr;

47

48 *size= FFMAX(17*min_size/16 + 32, min_size);

49

50 ptr= av_realloc(ptr, *size);

51 if(!ptr) //we could set this to the unmodified min_size but this is safer if the user lost the ptr and uses NULL now

52 *size= 0;

53

54 return ptr;

55 }

56

57 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size)

58 {

59 void **p = ptr;

60 if (min_size < *size)

61 return;

62 *size= FFMAX(17*min_size/16 + 32, min_size);

63 av_free(*p);

64 *p = av_malloc(*size);

65 if (!*p) *size = 0;

66 }

67

68