Split out packet. Delete common.

adsbus/packet.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <stdint.h>
+
+#define PACKET_DATA_LEN_MAX 14
+struct packet {
+	enum {
+		MODE_S_SHORT,
+		MODE_S_LONG,
+	} type;
+	#define NUM_TYPES 2
+	uint8_t payload[PACKET_DATA_LEN_MAX];
+	uint64_t mlat_timestamp;
+	uint32_t rssi;
+};
+extern char *packet_type_names[];
+
+#define PACKET_MLAT_MHZ 120
+// Use the signed max to avoid problems with some consumers; it's large enough to not matter.
+#define PACKET_MLAT_MAX INT64_MAX
+#define PACKET_RSSI_MAX UINT32_MAX
+
+struct packet_mlat_state {
+	uint64_t timestamp_last;
+	uint64_t timestamp_generation;
+};
+
+uint64_t packet_mlat_timestamp_scale_in(uint64_t, uint64_t, uint16_t, struct packet_mlat_state *);
+uint64_t packet_mlat_timestamp_scale_out(uint64_t, uint64_t, uint16_t);
+
+uint32_t packet_rssi_scale_in(uint32_t, uint32_t);
+uint32_t packet_rssi_scale_out(uint32_t, uint32_t);
+