ctab.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

#include "quicktime.h"
#include "sizes.h"

int quicktime_ctab_init(quicktime_ctab_t *ctab)
{
	ctab->seed = 0;
	ctab->flags = 0;
	ctab->size = 0;
	ctab->alpha = 0;
	ctab->red = 0;
	ctab->green = 0;
	ctab->blue = 0;
	return 0;
}

int quicktime_ctab_delete(quicktime_ctab_t *ctab)
{
	if(ctab->alpha) free(ctab->alpha);
	if(ctab->red) free(ctab->red);
	if(ctab->green) free(ctab->green);
	if(ctab->blue) free(ctab->blue);
	return 0;
}

int quicktime_ctab_dump(quicktime_ctab_t *ctab)
{
	int i;
	printf(" color table\n");
	printf("  seed %ld\n", ctab->seed);
	printf("  flags %ld\n", ctab->flags);
	printf("  size %ld\n", ctab->size);
	printf("  colors ");
	for(i = 0; i < ctab->size; i++)
	{
		printf("[%d %d %d %d]", ctab->red[i], ctab->green[i], ctab->blue[i], ctab->alpha[i]);
	}
	printf("\n");
}

int quicktime_read_ctab(quicktime_t *file, quicktime_ctab_t *ctab)
{
	int i;
	
	ctab->seed = quicktime_read_int32(file);
	ctab->flags = quicktime_read_int16(file);
	ctab->size = quicktime_read_int16(file) + 1;
	ctab->alpha = malloc(sizeof(QUICKTIME_INT16) * ctab->size);
	ctab->red = malloc(sizeof(QUICKTIME_INT16) * ctab->size);
	ctab->green = malloc(sizeof(QUICKTIME_INT16) * ctab->size);
	ctab->blue = malloc(sizeof(QUICKTIME_INT16) * ctab->size);
	
	for(i = 0; i < ctab->size; i++)
	{
		ctab->alpha[i] = quicktime_read_int16(file);
		ctab->red[i] = quicktime_read_int16(file);
		ctab->green[i] = quicktime_read_int16(file);
		ctab->blue[i] = quicktime_read_int16(file);
	}

	return 0;
}