Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / lib / viterbi / viterbi.h

diff --git a/gnuradio-core/src/lib/viterbi/viterbi.h b/gnuradio-core/src/lib/viterbi/viterbi.h
new file mode 100644 (file)
index 0000000..155b0d9
--- /dev/null
+++ b/gnuradio-core/src/lib/viterbi/viterbi.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/* The path memory for each state is 32 bits. This is slightly shorter
+ * than we'd like for K=7, especially since we chain back every 8 bits.
+ * But it fits so nicely into a 32-bit machine word...
+ */
+struct viterbi_state {
+  unsigned long path;  /* Decoded path to this state */
+  long metric;         /* Cumulative metric to this state */
+};
+
+int gen_met(int mettab[2][256],        /* Metric table */
+           int amp,            /* Signal amplitude */
+           double esn0,        /* Es/N0 ratio in dB */
+           double bias,        /* Metric bias */
+           int scale);         /* Scale factor */
+
+unsigned char
+encode(unsigned char *symbols, unsigned char *data,
+       unsigned int nbytes,unsigned char encstate);
+
+void 
+viterbi_chunks_init(struct viterbi_state* state);
+
+void 
+viterbi_butterfly2(unsigned char *symbols, int mettab[2][256], 
+                  struct viterbi_state *state0, struct viterbi_state *state1);
+
+unsigned char
+viterbi_get_output(struct viterbi_state *state, unsigned char *outbuf);