include/VSHelper.h

   1 //  Copyright (c) 2012 Fredrik Mellbin
   2 //
   3 //  Permission is hereby granted, free of charge, to any person obtaining a copy
   4 //  of this software and associated documentation files (the "Software"), to deal
   5 //  in the Software without restriction, including without limitation the rights
   6 //  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   7 //  copies of the Software, and to permit persons to whom the Software is
   8 //  furnished to do so, subject to the following conditions:
   9 //
  10 //  The above copyright notice and this permission notice shall be included in
  11 //  all copies or substantial portions of the Software.
  12 //
  13 //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14 //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15 //  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16 //  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17 //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  18 //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  19 //  THE SOFTWARE.
  20
  21 #ifndef VSHELPER_H
  22 #define VSHELPER_H
  23
  24 #include <limits.h>
  25 #include <stdint.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #ifdef _WIN32
  29 #include <malloc.h>
  30 #endif
  31 #include "VapourSynth.h"
  32
  33 // VS2010 doesn't recognize inline in c mode
  34 #if defined(_MSC_VER) && !defined(__cplusplus)
  35 #define inline _inline
  36 #endif
  37
  38 #ifdef _WIN32
  39 #define VS_ALIGNED_MALLOC(pptr, size, alignment) *(pptr) = _aligned_malloc((size), (alignment))
  40 #define VS_ALIGNED_FREE(ptr) _aligned_free((ptr))
  41 #else
  42 #define VS_ALIGNED_MALLOC(pptr, size, alignment) posix_memalign((void**)(pptr), (alignment), (size))
  43 #define VS_ALIGNED_FREE(ptr) free((ptr))
  44 #endif
  45
  46 #ifdef __cplusplus
  47 // A nicer templated malloc for all the C++ users out there
  48 template<class T>
  49 static inline T* vs_aligned_malloc(size_t size, size_t alignment) {
  50 #ifdef _WIN32
  51         return (T*)_aligned_malloc(size, alignment);
  52 #else
  53         void *tmp;
  54         if (posix_memalign(&tmp, alignment, size))
  55                 tmp = 0;
  56         return (T*)tmp;
  57 #endif
  58 }
  59
  60 static inline void vs_aligned_free(void *ptr) {
  61         VS_ALIGNED_FREE(ptr);
  62 }
  63 #endif //__cplusplus
  64
  65 // convenience function for checking if the format never changes between frames
  66 static inline int isConstantFormat(const VSVideoInfo *vi) {
  67     return vi->height > 0 && vi->width > 0 && vi->format;
  68 }
  69
  70 // convenience function to check for if two clips have the same format (unknown/changeable will be considered the same too)
  71 static inline int isSameFormat(const VSVideoInfo *v1, const VSVideoInfo *v2) {
  72     return v1->height == v2->height && v1->width == v2->width && v1->format == v2->format;
  73 }
  74
  75 // multiplies and divides a rational number, such as a frame duration, in place and reduces the result
  76 static inline int muldivRational(int64_t *num, int64_t *den, int64_t mul, int64_t div) {
  77     int64_t a, b;
  78     *num *= mul;
  79     *den *= div;
  80     a = *num;
  81     b = *den;
  82     while (b != 0) {
  83         int64_t t = a;
  84         a = b;
  85         b = t % b;
  86     }
  87     if (a < 0)
  88         a = -a;
  89     *num /= a;
  90     *den /= a;
  91     return 0;
  92 }
  93
  94 // converts an int64 to int with saturation, useful to silence warnings when reading int properties among other things
  95 static inline int int64ToIntS(int64_t i) {
  96     if (i > INT_MAX)
  97         return INT_MAX;
  98     else if (i < INT_MIN)
  99         return INT_MIN;
 100     else return (int)i;
 101 }
 102
 103 static inline void vs_bitblt(void *dstp, int dst_stride, const void *srcp, int src_stride, int row_size, int height) {
 104     if (height > 0) {
 105         if (src_stride == dst_stride && src_stride == row_size) {
 106             memcpy(dstp, srcp, row_size * height);
 107         } else {
 108             int i;
 109             uint8_t *srcp8 = (uint8_t *)srcp;
 110             uint8_t *dstp8 = (uint8_t *)dstp;
 111             for (i = 0; i < height; i++) {
 112                 memcpy(dstp8, srcp8, row_size);
 113                 srcp8 += src_stride;
 114                 dstp8 += dst_stride;
 115             }
 116         }
 117     }
 118 }
 119
 120 // check if the frame dimensions are valid for a given format
 121 // returns non-zero for valid width and height
 122 static inline int areValidDimensions(const VSFormat *fi, int width, int height) {
 123     return !(width % (1 << fi->subSamplingW) || height % (1 << fi->subSamplingH));
 124 }
 125
 126 #endif