avirgb.c

Go to the documentation of this file.

/*
 *
 * This is external code. Converts rgb-type avi-s.
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 *
 */

#include "AVI_avi.h"
#include <stdlib.h>
#include <string.h>

#include "MEM_guardedalloc.h"
#include "avirgb.h"

/* implementation */

void *avi_converter_from_avi_rgb (AviMovie *movie, int stream, unsigned char *buffer, int *size)
{
    int x, y,i, rowstride;
    unsigned char *buf;
    AviBitmapInfoHeader *bi;
    short bits= 32;
    
    (void)size; /* unused */

    bi= (AviBitmapInfoHeader *) movie->streams[stream].sf;
    if (bi) bits= bi->BitCount;

    if (bits==16) {
        unsigned short *pxl;
        unsigned char *to;
#ifdef __BIG_ENDIAN__
        unsigned char  *pxla;
#endif        
        
        buf = MEM_mallocN (movie->header->Height * movie->header->Width * 3, "fromavirgbbuf");

        y= movie->header->Height;
        to= buf;
                
        while (y--) {
            pxl= (unsigned short *) (buffer + y * movie->header->Width * 2);
            
#ifdef __BIG_ENDIAN__
            pxla= (unsigned char *)pxl;
#endif

            x= movie->header->Width;
            while (x--) {
#ifdef __BIG_ENDIAN__
                i= pxla[0];
                pxla[0]= pxla[1];
                pxla[1]= i;
    
                pxla+=2;
#endif
            
                *(to++)= ((*pxl>>10)&0x1f)*8;
                *(to++)= ((*pxl>>5)&0x1f)*8;
                *(to++)= (*pxl&0x1f)*8;
                pxl++;  
            }
        }

        MEM_freeN (buffer);
        
        return buf;
    } else {
        buf = MEM_mallocN (movie->header->Height * movie->header->Width * 3, "fromavirgbbuf");
    
        rowstride = movie->header->Width*3;
        if (bits!=16) if (movie->header->Width%2) rowstride++;
    
        for (y=0; y < movie->header->Height; y++) {
            memcpy (&buf[y*movie->header->Width*3], &buffer[((movie->header->Height-1)-y)*rowstride], movie->header->Width*3);
        }
    
        for (y=0; y < movie->header->Height*movie->header->Width*3; y+=3) {
            i = buf[y];
            buf[y] = buf[y+2];
            buf[y+2] = i;
        }
    
        MEM_freeN (buffer);
    
        return buf;
    }
}

void *avi_converter_to_avi_rgb (AviMovie *movie, int stream, unsigned char *buffer, int *size)
{
    int y, x, i, rowstride;
    unsigned char *buf;

    (void)stream; /* unused */

    *size= movie->header->Height * movie->header->Width * 3;
    if (movie->header->Width%2) *size+= movie->header->Height;
    
    buf = MEM_mallocN (*size,"toavirgbbuf");

    rowstride = movie->header->Width*3;
    if (movie->header->Width%2) rowstride++;

    for (y=0; y < movie->header->Height; y++) {
        memcpy (&buf[y*rowstride], &buffer[((movie->header->Height-1)-y)*movie->header->Width*3], movie->header->Width*3);
    }

    for (y=0; y < movie->header->Height; y++) {
        for (x=0; x < movie->header->Width*3; x+=3) {
            i = buf[y*rowstride+x];
            buf[y*rowstride+x] = buf[y*rowstride+x+2];
            buf[y*rowstride+x+2] = i;
        }
    }

    MEM_freeN (buffer);

    return buf;
}