Add first version of EDI input

1 files changed, 114 insertions, 0 deletions

diff --git a/lib/edi/ETIWriter.hpp b/lib/edi/ETIWriter.hpp
new file mode 100644
index 0000000..001f537
--- /dev/null
+++ b/lib/edi/ETIWriter.hpp
@@ -0,0 +1,114 @@
+/*
+   Copyright (C) 2016
+   Matthias P. Braendli, matthias.braendli@mpb.li
+
+   http://opendigitalradio.org
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#pragma once
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+#include <list>
+#include "eti.hpp"
+
+namespace EdiDecoder {
+
+// Information for Frame Characterisation available in
+// EDI.
+//
+// Number of streams is given separately, and frame length
+// is calculeted in the ETIWriter
+struct eti_fc_data {
+    bool atstf;
+    uint32_t tsta;
+    bool ficf;
+    uint16_t dflc;
+    uint8_t mid;
+    uint8_t fp;
+
+    uint8_t fct(void) const { return dflc % 250; }
+};
+
+// Information for a subchannel available in EDI
+struct eti_stc_data {
+    uint8_t scid;
+    uint8_t sad;
+    uint8_t tpl;
+    std::vector<uint8_t> mst;
+
+    // Return the length of the MST in multiples of 64 bits
+    uint16_t stl(void) const { return mst.size() / 8; }
+};
+
+class ETIWriter {
+    public:
+        // Tell the ETIWriter what EDI protocol we receive in *ptr.
+        // This is not part of the ETI data, but is used as check
+        void update_protocol(
+                const std::string& proto,
+                uint16_t major,
+                uint16_t minor);
+
+        // Update the data for the frame characterisation
+        void update_fc_data(const eti_fc_data& fc_data);
+
+        void update_fic(const std::vector<uint8_t>& fic);
+
+        void update_err(uint8_t err);
+
+        // In addition to TSTA in ETI, EDI also transports more time
+        // stamp information.
+        void update_edi_time(
+                uint32_t utco,
+                uint32_t seconds);
+
+        void update_mnsc(uint16_t mnsc);
+
+        void add_subchannel(const eti_stc_data& stc);
+
+        // Tell the ETIWriter that the AFPacket is complete
+        void assemble(void);
+
+        // Return the assembled ETI frame or an empty frame if not ready
+        std::vector<uint8_t> getEtiFrame(void);
+
+    private:
+        void reinit(void);
+
+        bool m_proto_valid = false;
+
+        uint8_t m_err;
+
+        bool m_fc_valid = false;
+        eti_fc_data m_fc;
+
+        // m_fic is valid if non-empty
+        std::vector<uint8_t> m_fic;
+
+        std::vector<uint8_t> m_etiFrame;
+
+        std::list<eti_stc_data> m_subchannels;
+
+        bool m_time_valid = false;
+        uint32_t m_utco;
+        uint32_t m_seconds;
+
+        uint16_t m_mnsc = 0xffff;
+};
+
+}