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]);
		else
			printf(" 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);

	
}