--- a/.hgignore	Mon Dec 22 06:59:45 2025 +0000
+++ b/.hgignore	Mon Dec 22 08:28:44 2025 +0000
@@ -27,6 +27,7 @@
 ^trau-decode/trau-parse$
 ^trau-decode/trau-parse-hex$
 ^trau-decode/trau-parse-n$
+^trau-decode/trau-parse-n8$
 ^trau-decode/trau-sync8$
 
 ^trau-files/.*\.dump$

--- a/trau-decode/Makefile	Mon Dec 22 06:59:45 2025 +0000
+++ b/trau-decode/Makefile	Mon Dec 22 08:28:44 2025 +0000
@@ -2,7 +2,7 @@
 CFLAGS=	-O2
 PROGS=	dump-1bit tfo-parse-fr16 trau-amr8-dump trau-amr8-dump-hex trau-extr \
 	trau-hr-dump trau-hr-dump-hex trau-parse trau-parse-hex trau-parse-n \
-	trau-sync8
+	trau-parse-n8 trau-sync8
 
 FR_OBJS=parse-fr.o parse-fr-common.o parse-efr.o
 HR_OBJS=gsmhr_unpack.o hr-guts.o
@@ -41,6 +41,9 @@
 trau-parse-n:	crc8gen.o parse-new16.o ${TRAU16_OBJS}
 	${CC} ${CFLAGS} -o $@ $^ -lgsmfr2 -lgsmefr
 
+trau-parse-n8:	amr8-common.o crc8gen.o parse-new8.o ${HR_OBJS}
+	${CC} ${CFLAGS} -o $@ $^
+
 trau-sync8:	trau-sync8.c
 	${CC} ${CFLAGS} -o $@ $@.c
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trau-decode/parse-new8.c	Mon Dec 22 08:28:44 2025 +0000
@@ -0,0 +1,214 @@
+/*
+ * This program reads a 64 kbit/s timeslot recording file, examines one
+ * of the eight 8 kbit/s subslots (selected), looks for all possible sync
+ * patterns (classic HR and TRAU-AMR-8k), and decodes whatever it finds.
+ */
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
+static uint8_t *filebuf;
+static unsigned total_size;
+
+static void
+read_ts_file(filename, subslot_arg)
+	char *filename, *subslot_arg;
+{
+	FILE *inf;
+	struct stat st;
+	int subslot, right_shift;
+	unsigned n;
+	uint8_t *dp;
+	int b;
+
+	inf = fopen(filename, "r");
+	if (!inf) {
+		perror(filename);
+		exit(1);
+	}
+	fstat(fileno(inf), &st);
+	if (!S_ISREG(st.st_mode)) {
+		fprintf(stderr, "error: %s is not a regular file\n", filename);
+		exit(1);
+	}
+	total_size = st.st_size;
+	if (total_size < 160) {
+		fprintf(stderr, "error: %s is too short\n", filename);
+		exit(1);
+	}
+	filebuf = malloc(total_size);
+	if (!filebuf) {
+		perror("malloc of file size");
+		exit(1);
+	}
+	subslot = atoi(subslot_arg);
+	if (subslot < 0 || subslot > 7) {
+		fprintf(stderr, "error: invalid subslot argument\n");
+		exit(1);
+	}
+	right_shift = 7 - subslot;
+	dp = filebuf;
+	for (n = 0; n < total_size; n++) {
+		b = getc(inf);
+		if (b < 0) {
+			fprintf(stderr,
+			"error: getc() returned EOF contrary to st_size\n");
+			exit(1);
+		}
+		*dp++ = (b >> right_shift) & 1;
+	}
+	fclose(inf);
+}
+
+static int
+is_classic_hr(cand)
+	uint8_t *cand;
+{
+	unsigned n;
+
+	for (n = 0; n < 8; n++) {
+		if (cand[n])
+			return 0;
+	}
+	if (!cand[8])
+		return 0;
+	if (cand[16])
+		return 0;
+	if (!cand[17])
+		return 0;
+	for (n = 3; n < 20; n++) {
+		if (!cand[n * 8])
+			return 0;
+	}
+	return 1;
+}
+
+static int
+check_sync(pos, cont)
+	unsigned pos;
+{
+	uint8_t *cand = filebuf + pos;
+
+	if (is_classic_hr(cand))
+		return 1;
+	if (is_amr_low(cand))
+		return 1;
+	if (!cont)
+		return 0;
+	if (is_amr_67(cand))
+		return 1;
+	if (is_amr_74(cand))
+		return 1;
+	return 0;
+}
+
+static void
+dump_raw_nibbles(bits, num_bits)
+	uint8_t *bits;
+	unsigned num_bits;
+{
+	uint8_t *sp = bits;
+	unsigned remain = num_bits;
+
+	if (remain >= 4) {
+		while (remain >= 4) {
+			printf("%x", (sp[0] << 3) | (sp[1] << 2) |
+				(sp[2] << 1) | sp[3]);
+			sp += 4;
+			remain -= 4;
+		}
+		putchar('\n');
+	}
+	if (remain) {
+		fputs("dribble ", stdout);
+		while (remain) {
+			printf("%u", *sp++);
+			remain--;
+		}
+		putchar('\n');
+	}
+}
+
+static int
+process_frame(pos)
+	unsigned pos;
+{
+	uint8_t *frame = filebuf + pos;
+
+	printf("Frame at 0x%x:\n", pos);
+	dump_raw_nibbles(frame, 160);
+	if (is_classic_hr(frame))
+		return print_gsmhr_frame(frame);
+	else
+		return print_amr8_frame(frame);
+}
+
+static void
+process_filebuf()
+{
+	unsigned p, nf_pos = 0, nf_accum = 0;
+	int match, num_t_bits;
+	int in_sync = 0;
+
+	for (p = 0; p < total_size; ) {
+		if ((total_size - p) >= 160)
+			match = check_sync(p, in_sync);
+		else
+			match = 0;
+		if (match) {
+			if (nf_accum) {
+				printf("Non-frame at 0x%x:\n", nf_pos);
+				dump_raw_nibbles(filebuf + nf_pos, nf_accum);
+			}
+			num_t_bits = process_frame(p);
+			if (num_t_bits == 2 && !filebuf[p+158] &&
+			    !filebuf[p+159]) {
+				puts("advance of 250 us");
+				p += 158;
+			} else if (num_t_bits == 2 && filebuf[p+158] &&
+				   !filebuf[p+159]) {
+				puts("advance of 125 us");
+				p += 159;
+			} else if (num_t_bits == 1 && !filebuf[p+159]) {
+				puts("advance of 125 us");
+				p += 159;
+			} else
+				p += 160;
+			nf_pos = p;
+			nf_accum = 0;
+			in_sync = 1;
+		} else {
+			p++;
+			nf_accum++;
+			if (nf_accum >= 320) {
+				printf("Non-frame at 0x%x:\n", nf_pos);
+				dump_raw_nibbles(filebuf + nf_pos, nf_accum);
+				nf_pos = p;
+				nf_accum = 0;
+			}
+			in_sync = 0;
+		}
+	}
+	if (nf_accum) {
+		printf("Non-frame at 0x%x:\n", nf_pos);
+		dump_raw_nibbles(filebuf + nf_pos, nf_accum);
+	}
+}
+
+main(argc, argv)
+	char **argv;
+{
+	if (argc != 3) {
+		fprintf(stderr, "usage: %s binfile subslot\n", argv[0]);
+		exit(1);
+	}
+	read_ts_file(argv[1], argv[2]);
+	process_filebuf();
+	exit(0);
+}