add ryfi decoder module

decoder_modules/ryfi_decoder/src/ryfi/rs_codec.h

@@ -0,0 +1,81 @@
+#pragma once
+#include <stdint.h>
+#include "dsp/processor.h"
+
+extern "C" {
+    #include "correct.h"
+}
+
+namespace ryfi {
+    // Size of an encoded reed-solomon block.
+    inline const int RS_BLOCK_ENC_SIZE  = 255;
+
+    // Size of a decoded reed-solomon block.
+    inline const int RS_BLOCK_DEC_SIZE  = 223;
+
+    // Number of reed-solomon blocks.
+    inline const int RS_BLOCK_COUNT     = 4;
+
+    // Scrambler sequence
+    extern const uint8_t RS_SCRAMBLER_SEQ[RS_BLOCK_ENC_SIZE*RS_BLOCK_COUNT];
+
+    /**
+     * RyFi Reed-Solomon Encoder.
+    */
+    class RSEncoder : public dsp::Processor<uint8_t, uint8_t> {
+        using base_type = dsp::Processor<uint8_t, uint8_t>;
+    public:
+        /**
+         * Create a reed-solomon encoder specifying an input stream.
+         * @param in Input stream
+        */
+        RSEncoder(dsp::stream<uint8_t>* in = NULL);
+
+        // Destructor
+        ~RSEncoder();
+
+        /**
+         * Encode data.
+         * @param in Input bytes.
+         * @param out Output bytes.
+         * @param count Number of input bytes.
+         * @return Number of output bytes.
+        */
+        int encode(const uint8_t* in, uint8_t* out, int count);
+
+    private:
+        int run();
+
+        correct_reed_solomon* rs;
+    };
+
+    /**
+     * RyFi Reed-Solomon Decoder.
+    */
+    class RSDecoder : public dsp::Processor<uint8_t, uint8_t> {
+        using base_type = dsp::Processor<uint8_t, uint8_t>;
+    public:
+        /**
+         * Create a reed-solomon decoder specifying an input stream.
+         * @param in Input stream
+        */
+        RSDecoder(dsp::stream<uint8_t>* in = NULL);
+
+        // Destructor
+        ~RSDecoder();
+
+        /**
+         * Decode data.
+         * @param in Input bytes.
+         * @param out Output bytes.
+         * @param count Number of input bytes.
+         * @return Number of output bytes.
+        */
+        int decode(uint8_t* in, uint8_t* out, int count);
+
+    private:
+        int run();
+
+        correct_reed_solomon* rs;
+    };
+}