shithub: mcfs

ref: 49dc43fd64bb77001494be6721380895f1bba971
dir: /extra/ivf2raw.c/

#include <u.h>
#include <libc.h>
#include <bio.h>

static int
Bu16le(Biobuf *b, u16int *o)
{
	int x;

	x = Bgetc(b);
	x |= Bgetc(b)<<8;
	*o = x;
	if(x < 0)
		werrstr("failed to read 2 bytes");

	return x < 0 ? -1 : 0;
}

static int
Bu32le(Biobuf *b, u32int *o)
{
	int x, i;

	*o = 0;
	for(i = 0; i < 4; *o |= x<<(i*8), i++){
		if((x = Bgetc(b)) < 0){
			werrstr("failed to read 4 bytes");
			return -1;
		}
	}

	return 0;
}

static int
Bu64le(Biobuf *b, u64int *o)
{
	int x, i;

	*o = 0;
	for(i = 0; i < 8; *o |= (uvlong)x<<(i*8), i++){
		if((x = Bgetc(b)) < 0){
			werrstr("failed to read 8 bytes");
			return -1;
		}
	}

	return 0;
}

static void
usage(void)
{
	fprint(2, "usage: %s [-h hxsz] [file.ivf] >file.raw\n", argv0);
	exits("usage");
}

void
main(int argc, char **argv)
{
	u64int timestamp, framenum;
	int n, bufsz, hxsz, fd;
	u32int tbnum, tbdenum;
	u16int w, h, hlen;
	Biobuf in, out;
	char tmp[6];
	u8int *buf;
	u32int sz;

	hxsz = 0;
	ARGBEGIN{
	case 'h':
		if((hxsz = atoi(EARGF(usage()))) > 0){
			fmtinstall('H', encodefmt);
			break;
		}
	default:
		usage();
	}ARGEND

	fd = 0;
	if(argc == 1){
		if((fd = open(*argv, OREAD)) < 0)
			sysfatal("%r");
	}else if(argc != 0)
		usage();

	Binit(&in, fd, OREAD);
	Binit(&out, 1, OWRITE);

	if(Bread(&in, tmp, 6) != 6 || Bu16le(&in, &hlen) < 0)
		sysfatal("header read failed");
	if(memcmp(tmp, "DKIF", 4) != 0)
		sysfatal("expected DKIF, got %02x%02x%02x%02x", tmp[0], tmp[1], tmp[2], tmp[3]);
	if(hlen < 0x20 || Bread(&in, tmp, 4) != 4)
		sysfatal("invalid header: hlen=%d", hlen);
	if(Bu16le(&in, &w) < 0 || Bu16le(&in, &h) < 0 || Bu32le(&in, &tbdenum) < 0 || Bu32le(&in, &tbnum) < 0)
		sysfatal("invalid header: %r");
	if(Bseek(&in, hlen, 0) != hlen)
		sysfatal("invalid IVF stream");

	bufsz = 0;
	buf = nil;
	for(framenum = 0;; framenum++){
		if(Bu32le(&in, &sz) < 0 || Bu64le(&in, &timestamp) < 0 || (int)sz < 0)
			break;
		if(bufsz < sz){
			bufsz = sz;
			if((buf = realloc(buf, bufsz)) == nil)
				sysfatal("frame %llud is too big: %d bytes", framenum, bufsz);
		}
		if((n = Bread(&in, buf, sz)) != sz)
			sysfatal("short read (%d < %d) at %lld", n, sz, Boffset(&in));
		if(hxsz < 1)
			Bwrite(&out, buf, sz);
		else
			Bprint(&out, "[%6llud %8llud %#7ux] %.*H\n", framenum, timestamp, sz, sz > hxsz ? hxsz : sz, buf);
	}

	Bterm(&in);
	Bterm(&out);

	exits(nil);
}