shithub: mcfs

Download patch

ref: bbba27dbb73cf46b659a707a425be7d8fd8097fe
parent: ad7fba114a0fabd5951274d8bc2f67c7b61dc959
author: Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com>
date: Sun Dec 13 11:17:28 EST 2020 

add extra/ivf2raw

diff: cannot open b/extra//null: file does not exist: 'b/extra//null' 
--- /dev/null
+++ b/extra/ivf2raw.c
@@ -1,0 +1,109 @@
+#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 |= 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 <file.ivf >file.raw\n", argv0);
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int n, bufsz, framenum;
+	u32int tbnum, tbdenum;
+	u16int w, h, hlen;
+	u64int timestamp;
+	Biobuf in, out;
+	char tmp[6];
+	u8int *buf;
+	u32int sz;
+
+	ARGBEGIN{
+	}ARGEND
+
+	if(argc != 0)
+		usage();
+
+	Binit(&in, 0, 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) || (int)sz < 0)
+			break;
+		if(bufsz < sz){
+			bufsz = sz;
+			if((buf = realloc(buf, bufsz)) == nil)
+				sysfatal("frame %d is too big: %d bytes", framenum, bufsz);
+		}
+		if((n = Bread(&in, buf, sz)) != sz)
+			sysfatal("short read (%d < %d)", n, sz);
+		Bwrite(&out, buf, sz);
+	}
+
+	Bterm(&in);
+	Bterm(&out);
+
+	exits(nil);
+}
--- /dev/null
+++ b/extra/mkfile
@@ -1,0 +1,8 @@
+</$objtype/mkfile
+
+TARG=ivf2raw
+BIN=/$objtype/bin
+
+default:V: all
+
+</sys/src/cmd/mkmany