Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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
  23.  * common internal and external API header
  24.  */
  25.  
  26. #ifndef AVUTIL_COMMON_H
  27. #define AVUTIL_COMMON_H
  28.  
  29. #include <errno.h>
  30. #include <inttypes.h>
  31. #include <limits.h>
  32. #include <math.h>
  33. #include <stdio.h>
  34. #include <stdlib.h>
  35. #include <string.h>
  36.  
  37. #include "attributes.h"
  38. #include "version.h"
  39. #include "libavutil/avconfig.h"
  40.  
  41. #if AV_HAVE_BIGENDIAN
  42. #   define AV_NE(be, le) (be)
  43. #else
  44. #   define AV_NE(be, le) (le)
  45. #endif
  46.  
  47. //rounded division & shift
  48. #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
  49. /* assume b>0 */
  50. #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
  51. /* assume a>0 and b>0 */
  52. #define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
  53.                                                        : ((a) + (1<<(b)) - 1) >> (b))
  54. #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
  55. #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
  56. #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
  57. #define FFSIGN(a) ((a) > 0 ? 1 : -1)
  58.  
  59. #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
  60. #define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
  61. #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
  62. #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
  63.  
  64. #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
  65. #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
  66. #define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))
  67.  
  68. /* misc math functions */
  69.  
  70. /**
  71.  * Reverse the order of the bits of an 8-bits unsigned integer.
  72.  */
  73. #if FF_API_AV_REVERSE
  74. extern attribute_deprecated const uint8_t av_reverse[256];
  75. #endif
  76.  
  77. #ifdef HAVE_AV_CONFIG_H
  78. #   include "config.h"
  79. #   include "intmath.h"
  80. #endif
  81.  
  82. /* Pull in unguarded fallback defines at the end of this file. */
  83. #include "common.h"
  84.  
  85. #ifndef av_log2
  86. av_const int av_log2(unsigned v);
  87. #endif
  88.  
  89. #ifndef av_log2_16bit
  90. av_const int av_log2_16bit(unsigned v);
  91. #endif
  92.  
  93. /**
  94.  * Clip a signed integer value into the amin-amax range.
  95.  * @param a value to clip
  96.  * @param amin minimum value of the clip range
  97.  * @param amax maximum value of the clip range
  98.  * @return clipped value
  99.  */
  100. static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
  101. {
  102. #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
  103.     if (amin > amax) abort();
  104. #endif
  105.     if      (a < amin) return amin;
  106.     else if (a > amax) return amax;
  107.     else               return a;
  108. }
  109.  
  110. /**
  111.  * Clip a signed 64bit integer value into the amin-amax range.
  112.  * @param a value to clip
  113.  * @param amin minimum value of the clip range
  114.  * @param amax maximum value of the clip range
  115.  * @return clipped value
  116.  */
  117. static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
  118. {
  119. #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
  120.     if (amin > amax) abort();
  121. #endif
  122.     if      (a < amin) return amin;
  123.     else if (a > amax) return amax;
  124.     else               return a;
  125. }
  126.  
  127. /**
  128.  * Clip a signed integer value into the 0-255 range.
  129.  * @param a value to clip
  130.  * @return clipped value
  131.  */
  132. static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
  133. {
  134.     if (a&(~0xFF)) return (-a)>>31;
  135.     else           return a;
  136. }
  137.  
  138. /**
  139.  * Clip a signed integer value into the -128,127 range.
  140.  * @param a value to clip
  141.  * @return clipped value
  142.  */
  143. static av_always_inline av_const int8_t av_clip_int8_c(int a)
  144. {
  145.     if ((a+0x80) & ~0xFF) return (a>>31) ^ 0x7F;
  146.     else                  return a;
  147. }
  148.  
  149. /**
  150.  * Clip a signed integer value into the 0-65535 range.
  151.  * @param a value to clip
  152.  * @return clipped value
  153.  */
  154. static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
  155. {
  156.     if (a&(~0xFFFF)) return (-a)>>31;
  157.     else             return a;
  158. }
  159.  
  160. /**
  161.  * Clip a signed integer value into the -32768,32767 range.
  162.  * @param a value to clip
  163.  * @return clipped value
  164.  */
  165. static av_always_inline av_const int16_t av_clip_int16_c(int a)
  166. {
  167.     if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
  168.     else                      return a;
  169. }
  170.  
  171. /**
  172.  * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
  173.  * @param a value to clip
  174.  * @return clipped value
  175.  */
  176. static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
  177. {
  178.     if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);
  179.     else                                         return (int32_t)a;
  180. }
  181.  
  182. /**
  183.  * Clip a signed integer to an unsigned power of two range.
  184.  * @param  a value to clip
  185.  * @param  p bit position to clip at
  186.  * @return clipped value
  187.  */
  188. static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
  189. {
  190.     if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
  191.     else                   return  a;
  192. }
  193.  
  194. /**
  195.  * Add two signed 32-bit values with saturation.
  196.  *
  197.  * @param  a one value
  198.  * @param  b another value
  199.  * @return sum with signed saturation
  200.  */
  201. static av_always_inline int av_sat_add32_c(int a, int b)
  202. {
  203.     return av_clipl_int32((int64_t)a + b);
  204. }
  205.  
  206. /**
  207.  * Add a doubled value to another value with saturation at both stages.
  208.  *
  209.  * @param  a first value
  210.  * @param  b value doubled and added to a
  211.  * @return sum with signed saturation
  212.  */
  213. static av_always_inline int av_sat_dadd32_c(int a, int b)
  214. {
  215.     return av_sat_add32(a, av_sat_add32(b, b));
  216. }
  217.  
  218. /**
  219.  * Clip a float value into the amin-amax range.
  220.  * @param a value to clip
  221.  * @param amin minimum value of the clip range
  222.  * @param amax maximum value of the clip range
  223.  * @return clipped value
  224.  */
  225. static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
  226. {
  227. #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
  228.     if (amin > amax) abort();
  229. #endif
  230.     if      (a < amin) return amin;
  231.     else if (a > amax) return amax;
  232.     else               return a;
  233. }
  234.  
  235. /**
  236.  * Clip a double value into the amin-amax range.
  237.  * @param a value to clip
  238.  * @param amin minimum value of the clip range
  239.  * @param amax maximum value of the clip range
  240.  * @return clipped value
  241.  */
  242. static av_always_inline av_const double av_clipd_c(double a, double amin, double amax)
  243. {
  244. #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
  245.     if (amin > amax) abort();
  246. #endif
  247.     if      (a < amin) return amin;
  248.     else if (a > amax) return amax;
  249.     else               return a;
  250. }
  251.  
  252. /** Compute ceil(log2(x)).
  253.  * @param x value used to compute ceil(log2(x))
  254.  * @return computed ceiling of log2(x)
  255.  */
  256. static av_always_inline av_const int av_ceil_log2_c(int x)
  257. {
  258.     return av_log2((x - 1) << 1);
  259. }
  260.  
  261. /**
  262.  * Count number of bits set to one in x
  263.  * @param x value to count bits of
  264.  * @return the number of bits set to one in x
  265.  */
  266. static av_always_inline av_const int av_popcount_c(uint32_t x)
  267. {
  268.     x -= (x >> 1) & 0x55555555;
  269.     x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
  270.     x = (x + (x >> 4)) & 0x0F0F0F0F;
  271.     x += x >> 8;
  272.     return (x + (x >> 16)) & 0x3F;
  273. }
  274.  
  275. /**
  276.  * Count number of bits set to one in x
  277.  * @param x value to count bits of
  278.  * @return the number of bits set to one in x
  279.  */
  280. static av_always_inline av_const int av_popcount64_c(uint64_t x)
  281. {
  282.     return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
  283. }
  284.  
  285. #define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
  286. #define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
  287.  
  288. /**
  289.  * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
  290.  *
  291.  * @param val      Output value, must be an lvalue of type uint32_t.
  292.  * @param GET_BYTE Expression reading one byte from the input.
  293.  *                 Evaluated up to 7 times (4 for the currently
  294.  *                 assigned Unicode range).  With a memory buffer
  295.  *                 input, this could be *ptr++.
  296.  * @param ERROR    Expression to be evaluated on invalid input,
  297.  *                 typically a goto statement.
  298.  *
  299.  * @warning ERROR should not contain a loop control statement which
  300.  * could interact with the internal while loop, and should force an
  301.  * exit from the macro code (e.g. through a goto or a return) in order
  302.  * to prevent undefined results.
  303.  */
  304. #define GET_UTF8(val, GET_BYTE, ERROR)\
  305.     val= GET_BYTE;\
  306.     {\
  307.         uint32_t top = (val & 128) >> 1;\
  308.         if ((val & 0xc0) == 0x80 || val >= 0xFE)\
  309.             ERROR\
  310.         while (val & top) {\
  311.             int tmp= GET_BYTE - 128;\
  312.             if(tmp>>6)\
  313.                 ERROR\
  314.             val= (val<<6) + tmp;\
  315.             top <<= 5;\
  316.         }\
  317.         val &= (top << 1) - 1;\
  318.     }
  319.  
  320. /**
  321.  * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
  322.  *
  323.  * @param val       Output value, must be an lvalue of type uint32_t.
  324.  * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
  325.  *                  to native byte order.  Evaluated one or two times.
  326.  * @param ERROR     Expression to be evaluated on invalid input,
  327.  *                  typically a goto statement.
  328.  */
  329. #define GET_UTF16(val, GET_16BIT, ERROR)\
  330.     val = GET_16BIT;\
  331.     {\
  332.         unsigned int hi = val - 0xD800;\
  333.         if (hi < 0x800) {\
  334.             val = GET_16BIT - 0xDC00;\
  335.             if (val > 0x3FFU || hi > 0x3FFU)\
  336.                 ERROR\
  337.             val += (hi<<10) + 0x10000;\
  338.         }\
  339.     }\
  340.  
  341. /**
  342.  * @def PUT_UTF8(val, tmp, PUT_BYTE)
  343.  * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
  344.  * @param val is an input-only argument and should be of type uint32_t. It holds
  345.  * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
  346.  * val is given as a function it is executed only once.
  347.  * @param tmp is a temporary variable and should be of type uint8_t. It
  348.  * represents an intermediate value during conversion that is to be
  349.  * output by PUT_BYTE.
  350.  * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
  351.  * It could be a function or a statement, and uses tmp as the input byte.
  352.  * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
  353.  * executed up to 4 times for values in the valid UTF-8 range and up to
  354.  * 7 times in the general case, depending on the length of the converted
  355.  * Unicode character.
  356.  */
  357. #define PUT_UTF8(val, tmp, PUT_BYTE)\
  358.     {\
  359.         int bytes, shift;\
  360.         uint32_t in = val;\
  361.         if (in < 0x80) {\
  362.             tmp = in;\
  363.             PUT_BYTE\
  364.         } else {\
  365.             bytes = (av_log2(in) + 4) / 5;\
  366.             shift = (bytes - 1) * 6;\
  367.             tmp = (256 - (256 >> bytes)) | (in >> shift);\
  368.             PUT_BYTE\
  369.             while (shift >= 6) {\
  370.                 shift -= 6;\
  371.                 tmp = 0x80 | ((in >> shift) & 0x3f);\
  372.                 PUT_BYTE\
  373.             }\
  374.         }\
  375.     }
  376.  
  377. /**
  378.  * @def PUT_UTF16(val, tmp, PUT_16BIT)
  379.  * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
  380.  * @param val is an input-only argument and should be of type uint32_t. It holds
  381.  * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
  382.  * val is given as a function it is executed only once.
  383.  * @param tmp is a temporary variable and should be of type uint16_t. It
  384.  * represents an intermediate value during conversion that is to be
  385.  * output by PUT_16BIT.
  386.  * @param PUT_16BIT writes the converted UTF-16 data to any proper destination
  387.  * in desired endianness. It could be a function or a statement, and uses tmp
  388.  * as the input byte.  For example, PUT_BYTE could be "*output++ = tmp;"
  389.  * PUT_BYTE will be executed 1 or 2 times depending on input character.
  390.  */
  391. #define PUT_UTF16(val, tmp, PUT_16BIT)\
  392.     {\
  393.         uint32_t in = val;\
  394.         if (in < 0x10000) {\
  395.             tmp = in;\
  396.             PUT_16BIT\
  397.         } else {\
  398.             tmp = 0xD800 | ((in - 0x10000) >> 10);\
  399.             PUT_16BIT\
  400.             tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
  401.             PUT_16BIT\
  402.         }\
  403.     }\
  404.  
  405.  
  406.  
  407. #include "mem.h"
  408.  
  409. #ifdef HAVE_AV_CONFIG_H
  410. #    include "internal.h"
  411. #endif /* HAVE_AV_CONFIG_H */
  412.  
  413. #endif /* AVUTIL_COMMON_H */
  414.  
  415. /*
  416.  * The following definitions are outside the multiple inclusion guard
  417.  * to ensure they are immediately available in intmath.h.
  418.  */
  419.  
  420. #ifndef av_ceil_log2
  421. #   define av_ceil_log2     av_ceil_log2_c
  422. #endif
  423. #ifndef av_clip
  424. #   define av_clip          av_clip_c
  425. #endif
  426. #ifndef av_clip64
  427. #   define av_clip64        av_clip64_c
  428. #endif
  429. #ifndef av_clip_uint8
  430. #   define av_clip_uint8    av_clip_uint8_c
  431. #endif
  432. #ifndef av_clip_int8
  433. #   define av_clip_int8     av_clip_int8_c
  434. #endif
  435. #ifndef av_clip_uint16
  436. #   define av_clip_uint16   av_clip_uint16_c
  437. #endif
  438. #ifndef av_clip_int16
  439. #   define av_clip_int16    av_clip_int16_c
  440. #endif
  441. #ifndef av_clipl_int32
  442. #   define av_clipl_int32   av_clipl_int32_c
  443. #endif
  444. #ifndef av_clip_uintp2
  445. #   define av_clip_uintp2   av_clip_uintp2_c
  446. #endif
  447. #ifndef av_sat_add32
  448. #   define av_sat_add32     av_sat_add32_c
  449. #endif
  450. #ifndef av_sat_dadd32
  451. #   define av_sat_dadd32    av_sat_dadd32_c
  452. #endif
  453. #ifndef av_clipf
  454. #   define av_clipf         av_clipf_c
  455. #endif
  456. #ifndef av_clipd
  457. #   define av_clipd         av_clipd_c
  458. #endif
  459. #ifndef av_popcount
  460. #   define av_popcount      av_popcount_c
  461. #endif
  462. #ifndef av_popcount64
  463. #   define av_popcount64    av_popcount64_c
  464. #endif
  465.