Add example bcch_rx application

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

src/.gitignore

@@ -0,0 +1 @@
+bcch_rx

src/Makefile

@@ -0,0 +1,8 @@
+CC=gcc
+CFLAGS=-I../include/ `pkg-config --cflags libosmocore` -Wall
+LDFLAGS=`pkg-config --libs libosmocore`
+
+bcch_rx:bcch_rx.o gsmtap.o l1/conv.o l1/crc.o l1/interleave.o l1/punct.o l1/scramb.o l1/bcch.o
+
+clean:
+	rm *.o l1/*.o -f

src/bcch_rx.c

@@ -0,0 +1,33 @@
+#include <stdint.h>
+#include <stdio.h>
+
+#include <osmocom/core/gsmtap.h>
+#include <osmocom/core/gsmtap_util.h>
+#include <osmocom/gmr1/gsmtap.h>
+#include <osmocom/gmr1/l1/bcch.h>
+
+
+int main(int argc, char *argv[])
+{
+	struct gsmtap_inst *gti;
+	sbit_t bits_e[424];
+	uint8_t l2[24];
+	int i, crc, conv;
+
+	for (i=0; i<424; i++) {
+		bits_e[i] = argv[1][i] == '1' ? -127 : 127;
+	}
+
+	gti = gsmtap_source_init("127.0.0.1", GSMTAP_UDP_PORT, 0);
+	gsmtap_source_add_sink(gti);
+
+	crc = gmr1_bcch_decode(l2, bits_e, &conv);
+
+	fprintf(stderr, "conv: %d\n", conv);
+	fprintf(stderr, "crc: %d\n", crc);
+
+	if (!crc)
+		gsmtap_sendmsg(gti, gmr1_gsmtap_makemsg(GSMTAP_GMR1_BCCH, l2, 24));
+
+	return 0;
+}