如何高效、可移植申请内存代码。
在视频编解码中，如何申请char mem_2D[1920][1080],
char mem_3D[4][1920][1080],
char mem_4D[6][4][1920][1080]，高效 又 可移植申请内存呢？
请看如下代码：
看完后，如要申请的是 int ，不是char ，如何修改？ 如何要8字节对齐，如何修改？
请自己考虑，很简单的。
#include <stdio.h>#include <stdlib.h>#include <string.h>typedef unsigned char pel_t;typedef int int_t;int get_mem_2D(pel_t *** arr2D,int row,int column){int i;if ((*arr2D = (pel_t **)calloc(row,sizeof(pel_t*))) == NULL){printf("can't calloc memory 2D\n");return 0;}if (((*arr2D)[0] = (pel_t *)calloc(row * column,sizeof(pel_t))) == NULL){printf("can't calloc memory 2D data\n");return 0;}for(i = 1; i < row;i++)(*arr2D)[i] = (*arr2D)[i- 1] + column;return (row *column * sizeof(pel_t));}int get_mem_3D(pel_t ****arr3D,int frames,int row,int column){int i;if ( ( *arr3D = (pel_t ***) calloc(frames,sizeof(pel_t*)) ) == NULL){printf("can't calloc memory 3D\n");return 0;}for(i = 0 ;i < frames; i++)get_mem_2D(&(*arr3D)[i],row,column);return (frames * row * column * sizeof(pel_t));}int get_mem_4D(pel_t *****arr4D,int index,int frames,int row,int column){int i;if ( ( *arr4D = (pel_t ****) calloc(index,sizeof(pel_t*)) ) == NULL){printf("can't calloc memory 3D\n");return 0;}for(i = 0 ;i < index; i++)get_mem_3D(&(*arr4D)[i],frames,row,column);return (index * frames * row * column * sizeof(pel_t));}void free_2D(pel_t ** arr2D){if (arr2D){if (arr2D[0])free(arr2D[0]);elseprintf(" free wrong");free(arr2D);}else{printf( "not memory free\n");}}void free_3D(pel_t *** arr3D,int frames){int i;if (arr3D){for(i = 0; i < frames;i++){free_2D(arr3D[i]);}free(arr3D);}else{printf( "not memory free\n");}}void free_4D(pel_t **** arr4D,int index,int frames){int i;if (arr4D){for(i = 0; i < index;i++){free_3D(arr4D[i],frames);}free(arr4D);}else{printf( "not memory free\n");}}void main(void){int ret;pel_t **arr;pel_t ***arr3D;pel_t ****arr4D;ret = get_mem_2D(&arr,1080,1920);printf("ret = %d\n",ret);ret = get_mem_3D(&arr3D,4,1080,1920);printf("ret = %d\n",ret);ret = get_mem_4D(&arr4D,6, 4,1080,1920);printf("ret = %d\n",ret);free_2D(arr);free_3D(arr3D,4);free_4D(arr4D,6,4);}