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/**********************************************************************
** Copyright (C) 2003 Michael 'Mickey' Lauer. All rights reserved.
** Based on work from Andrew Tridgell and the jpegtoavi project
**
** This file is part of Opie Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
**********************************************************************/
#include "avi.h"
#include <string.h>
#include <stdio.h>
int nframes;
int totalsize;
unsigned int* sizes;
void fprint_quartet(int fd, unsigned int i)
{
char data[4];
data[0] = (char) i%0x100;
i /= 0x100;
data[1] = (char) i%0x100;
i /= 0x100;
data[2] = (char) i%0x100;
i /= 0x100;
data[3] = (char) i%0x100;
write( fd, &data, 4 );
}
// start writing an AVI file
void avi_start(int fd, int frames)
{
int ofs = sizeof(struct riff_head)+
sizeof(struct list_head)+
sizeof(struct avi_head)+
sizeof(struct list_head)+
sizeof(struct stream_head)+
sizeof(struct frame_head)+
sizeof(struct list_head)+
sizeof(struct dmlh_head)+
sizeof(struct list_head);
printf( "avi_start: frames = %d\n", frames );
lseek(fd, ofs, SEEK_SET);
nframes = 0;
totalsize = 0;
sizes = (unsigned int*) calloc( sizeof(unsigned int), frames ); // hold size of each frame
}
// add a jpeg frame to an AVI file
void avi_add(int fd, u8 *buf, int size)
{
struct db_head db = {"00db", 0};
printf( "avi_add: nframes = %d, totalsize = %d, size = %d\n", nframes, totalsize, size );
// overwrite JFIF type with AVI1
buf[6]='A';
buf[7]='V';
buf[8]='I';
buf[9]='1';
while( size%4 ) size++; // align 0 modulo 4*/
db.size = size;
write( fd, &db, sizeof(db) );
write( fd, buf, size );
sizes[nframes] = size;
nframes++;
totalsize += size; // total frame size
}
// finish writing the AVI file - filling in the header
void avi_end(int fd, int width, int height, int fps)
{
struct idx1_head idx = {"idx1", 16*nframes };
struct db_head db = {"00db", 0};
struct riff_head rh = { "RIFF", 0, "AVI "};
struct list_head lh1 = {"LIST", 0, "hdrl"};
struct avi_head ah;
struct list_head lh2 = {"LIST", 0, "strl"};
struct stream_head sh;
struct frame_head fh;
struct list_head lh3 = {"LIST", 0, "odml" };
struct dmlh_head dh = {"dmlh", 4, nframes };
struct list_head lh4 = {"LIST", 0, "movi"};
int i;
unsigned int offset = 4;
printf( "avi_end: nframes = %d, fps = %d\n", nframes, fps );
// write index
write(fd, &idx, sizeof(idx));
for ( i = 0; i < nframes; i++ )
{
write(fd, &db, 4 ); // only need the 00db
fprint_quartet( fd, 18 ); // ???
fprint_quartet( fd, offset );
fprint_quartet( fd, sizes[i] );
offset += sizes[i] + 8; //+8 (for the additional header)
}
free( sizes );
bzero( &ah, sizeof(ah) );
strcpy(ah.avih, "avih");
ah.time = 1000000 / fps;
ah.maxbytespersec = 1000000.0*(totalsize/nframes)/ah.time;
ah.nframes = nframes;
ah.numstreams = 1;
ah.flags = AVIF_HASINDEX;
ah.width = width;
ah.height = height;
bzero(&sh, sizeof(sh));
strcpy(sh.strh, "strh");
strcpy(sh.vids, "vids");
strcpy(sh.codec, "MJPG");
sh.scale = ah.time;
sh.rate = 1000000;
sh.length = nframes;
bzero(&fh, sizeof(fh));
strcpy(fh.strf, "strf");
fh.width = width;
fh.height = height;
fh.planes = 1;
fh.bitcount = 24;
strcpy(fh.codec,"MJPG");
fh.unpackedsize = 3*width*height;
rh.size = sizeof(lh1)+sizeof(ah)+sizeof(lh2)+sizeof(sh)+
sizeof(fh)+sizeof(lh3)+sizeof(dh)+sizeof(lh4)+
nframes*sizeof(struct db_head)+
totalsize + sizeof(struct idx1_head)+ (16*nframes) +4; // FIXME:16 bytes per nframe // the '4' - what for???
lh1.size = 4+sizeof(ah)+sizeof(lh2)+sizeof(sh)+sizeof(fh)+sizeof(lh3)+sizeof(dh);
ah.size = sizeof(ah)-8;
lh2.size = 4+sizeof(sh)+sizeof(fh)+sizeof(lh3)+sizeof(dh); //4+sizeof(sh)+sizeof(fh);
sh.size = sizeof(sh)-8;
fh.size = sizeof(fh)-8;
fh.size2 = fh.size;
lh3.size = 4+sizeof(dh);
lh4.size = 4+ nframes*sizeof(struct db_head)+ totalsize;
lseek(fd, 0, SEEK_SET);
write(fd, &rh, sizeof(rh));
write(fd, &lh1, sizeof(lh1));
write(fd, &ah, sizeof(ah));
write(fd, &lh2, sizeof(lh2));
write(fd, &sh, sizeof(sh));
write(fd, &fh, sizeof(fh));
write(fd, &lh3, sizeof(lh3));
write(fd, &dh, sizeof(dh));
write(fd, &lh4, sizeof(lh4));
}
/* NOTE: This is not a general purpose routine - it is meant to only
cope with AVIs saved using the other functions in this file
void avi_explode(char *fname)
{
struct riff_head rh;
struct list_head lh1;
struct avi_head ah;
struct list_head lh2;
struct stream_head sh;
struct frame_head fh;
struct list_head lh3;
int hsize, qsize;
u16 *htables = jpeg_huffman_tables(&hsize);
u16 *qtables = jpeg_quantisation_tables(&qsize, image_quality);
int fd, i;
fd = open(fname,O_RDONLY);
if (fd == -1) {
perror(fname);
return;
}
read(fd, &rh, sizeof(rh));
read(fd, &lh1, sizeof(lh1));
read(fd, &ah, sizeof(ah));
read(fd, &lh2, sizeof(lh2));
read(fd, &sh, sizeof(sh));
read(fd, &fh, sizeof(fh));
read(fd, &lh3, sizeof(lh3));
for (i=0; ; i++) {
u8 buf[500*1024];
struct db_head db;
char fname[100];
int fd2;
if (read(fd, &db, sizeof(db)) != sizeof(db) ||
read(fd, buf, db.size) != db.size) break;
snprintf(fname, sizeof(fname)-1,"frame.%d", i);
fd2 = open(fname,O_WRONLY|O_CREAT, 0644);
if (fd2 == -1) {
perror(fname);
continue;
}
write(fd2, buf, 2);
write(fd2, qtables, qsize);
write(fd2, htables, hsize);
write(fd2, buf+2, db.size-2);
close(fd2);
}
close(fd);
printf("exploded %d frames\n", i);
}
*/
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