--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/efrtest/etsi-enc.c	Tue Nov 29 20:31:11 2022 +0000
@@ -0,0 +1,126 @@
+/*
+ * gsmefr-etsi-enc is a test program for our EFR encoder: it reads raw
+ * 16-bit PCM (matching ETSI's *.inp) as input and writes ETSI's *.cod
+ * format as output, allowing our decoder to be tested with ETSI's
+ * official test sequences.
+ *
+ * ETSI input and output files are read and written in LE byte order,
+ * matching the official test sequences in ts_100725v050200p0.zip.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "../libgsmefr/gsm_efr.h"
+
+static int
+read_input(inf, pcm, filename_for_errs)
+	FILE *inf;
+	int16_t *pcm;
+	char *filename_for_errs;
+{
+	uint8_t file_bytes[320], *sp;
+	int cc;
+	unsigned n;
+
+	cc = fread(file_bytes, 2, 160, inf);
+	if (cc == 0)
+		return 0;
+	if (cc != 160) {
+		fprintf(stderr, "error: short read from %s\n",
+			filename_for_errs);
+		exit(1);
+	}
+	sp = file_bytes;
+	for (n = 0; n < 160; n++) {
+		pcm[n] = sp[0] | (sp[1] << 8);
+		sp += 2;
+	}
+	return 1;
+}
+
+static void
+frame2bits(frame, bits)
+	uint8_t *frame, *bits;
+{
+	unsigned nb, byte, mask, bit;
+
+	for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
+		byte = *frame++;
+		for (mask = 0x80; mask; mask >>= 1) {
+			if (byte & mask)
+				bit = 1;
+			else
+				bit = 0;
+			*bits++ = bit;
+		}
+	}
+}
+
+static void
+emit_output(outf, bits, nbits)
+	FILE *outf;
+	uint8_t *bits;
+	unsigned nbits;
+{
+	unsigned n;
+
+	for (n = 0; n < nbits; n++) {
+		putc(bits[n], outf);
+		putc(0, outf);
+	}
+}
+
+main(argc, argv)
+	char **argv;
+{
+	char *infname, *outfname;
+	FILE *inf, *outf;
+	struct EFR_encoder_state *state;
+	int16_t pcm[160];
+	uint8_t frame[EFR_RTP_FRAME_LEN], bits[250];
+	int dtx, rc, sp, vad;
+
+	if (argc == 3 && argv[1][0] != '-') {
+		dtx = 0;
+		infname = argv[1];
+		outfname = argv[2];
+	} else if (argc == 4 && !strcmp(argv[1], "-d")) {
+		dtx = 1;
+		infname = argv[2];
+		outfname = argv[3];
+	} else {
+		fprintf(stderr, "usage: %s [-d] input.inp output.cod\n",
+			argv[0]);
+		exit(1);
+	}
+	inf = fopen(infname, "r");
+	if (!inf) {
+		perror(infname);
+		exit(1);
+	}
+	outf = fopen(outfname, "w");
+	if (!outf) {
+		perror(outfname);
+		exit(1);
+	}
+	state = EFR_encoder_create(dtx);
+	if (!state) {
+		perror("EFR_encoder_create()");
+		exit(1);
+	}
+	for (;;) {
+		rc = read_input(inf, pcm, argv[1]);
+		if (!rc)
+			break;
+		EFR_encode_frame(state, pcm, frame, &sp, &vad);
+		frame2bits(frame, bits);
+		bits[248] = vad;
+		bits[249] = sp;
+		emit_output(outf, bits + 4, 246);
+	}
+	fclose(outf);
+	exit(0);
+}