shithub: mcfs

Download patch

ref: a930f637273d91a18e381a76af87dab44a2a3f50
parent: 2dfc08f6b27c796f1b2b140f1e3b37d137cd260c
author: Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com>
date: Wed Feb 17 10:41:37 EST 2021 

extra: add video/adtsdump utility


--- /dev/null
+++ b/extra/adtsdump.c
@@ -1,0 +1,141 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+
+static char *objtype[] = {
+	"aac main",
+	"aac lc  ",
+	"aac ssr ",
+	"aac ltp ",
+};
+
+static char *rate[] = {
+	"96000",
+	"88200",
+	"64000",
+	"48000",
+	"44100",
+	"32000",
+	"24000",
+	"22050",
+	"16000",
+	"12000",
+	"11025",
+	"8000 ",
+	"7350 ",
+	"???  ",
+	"???  ",
+	"expl ",
+};
+
+static char *chan[] = {
+	"AOT",
+	"1  ",
+	"2  ",
+	"3  ",
+	"4  ",
+	"5  ",
+	"6  ",
+	"8  ",
+	"???",
+	"???",
+	"???",
+	"???",
+	"???",
+	"???",
+	"???",
+	"???",
+};
+
+static void
+usage(void)
+{
+	fprint(2, "usage: %s [-h hxsz] [file.aac]\n", argv0);
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int hxsz, fd, d, n, sz;
+	Biobuf in, out;
+	u8int b[7], *h;
+
+	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();
+
+	if((h = malloc(hxsz)) == nil)
+		sysfatal("memory");
+
+	Binit(&in, fd, OREAD);
+	Binit(&out, 1, OWRITE);
+	fmtinstall('H', encodefmt);
+
+	for(;;){
+		if((n = Bread(&in, b, 7)) == 0)
+			break;
+		if(n < 0)
+			goto err;
+		if(n != 7){
+			werrstr("short ADTS: %d != 7", n);
+			goto err;
+		}
+
+		if(b[0] != 0xff || (b[0]&0xf0) != 0xf0){
+			werrstr("invalid syncword %2x%02x", b[0], b[1]);
+			goto err;
+		}
+		sz = (b[3]&3)<<11 | b[4]<<3 | b[5]>>5;
+		sz -= 7;
+		Bprint(&out, "%s %s %s %s %d %d",
+			(b[1]&8) ? "mpeg2" : "mpeg4",
+			objtype[b[2]>>6],
+			rate[(b[2]>>2)&0xf],
+			chan[(b[2]&3)<<2 | b[3]>>6],
+			sz - ((b[1]&1) == 0 ? 2 : 0),
+			(b[6]&3)+1
+		);
+		if((b[1]&1) == 0){ /* skip crc */
+			if((n = Bread(&in, b, 2)) != 2){ 
+				werrstr("short ADTS.crc: %d != 2", n);
+				goto err;
+			}
+			sz -= 2;
+		}
+		d = sz < hxsz ? sz : hxsz;
+		sz -= d;
+		if(d > 0){
+			if((n = Bread(&in, h, d)) != d){
+				werrstr("short read: %d != %d", n, d);
+				goto err;
+			}
+			Bprint(&out, " [%.*H]", d, h);
+		}
+		Bprint(&out, "\n");
+		if(Bseek(&in, sz, 1) < 0)
+			goto err;
+	}
+
+	Bterm(&out);
+	Bterm(&in);
+
+	exits(nil);
+err:
+	fprint(2, "%s: %r (at %#llx)\n", fd == 0 ? "stdin" : *argv, Boffset(&in));
+	exits("error");
+}
--- a/extra/ivf2raw.c
+++ b/extra/ivf2raw.c
@@ -51,7 +51,7 @@
 static void
 usage(void)
 {
-	fprint(2, "usage: %s [-h NUM] [file.ivf] >file.raw\n", argv0);
+	fprint(2, "usage: %s [-h hxsz] [file.ivf] >file.raw\n", argv0);
 	exits("usage");
 }
 
--- a/extra/mkfile
+++ b/extra/mkfile
@@ -1,6 +1,6 @@
 </$objtype/mkfile
 
-TARG=ivf2raw mkvdump
+TARG=adtsdump ivf2raw mkvdump
 CFLAGS=$CFLAGS -I..
 BIN=/$objtype/bin/video