Merge branch 'dfsg-orig'

[debian/gnuradio] / gr-atsc / src / lib / atsci_viterbi_decoder.h

diff --git a/gr-atsc/src/lib/atsci_viterbi_decoder.h b/gr-atsc/src/lib/atsci_viterbi_decoder.h
new file mode 100644 (file)
index 0000000..22e3c18
--- /dev/null
+++ b/gr-atsc/src/lib/atsci_viterbi_decoder.h
@@ -0,0 +1,83 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 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.
+ */
+
+#ifndef _ATSC_VITERBI_DECODER_H_
+#define _ATSC_VITERBI_DECODER_H_
+
+#define        USE_SIMPLE_SLICER  0
+
+#include <atsc_types.h>
+#include <interleaver_fifo.h>
+
+#if (USE_SIMPLE_SLICER)
+#include <atsci_fake_single_viterbi.h>
+typedef atsci_fake_single_viterbi      single_viterbi_t;
+#else
+#include <atsci_single_viterbi.h>
+typedef atsci_single_viterbi           single_viterbi_t;
+#endif
+
+/*!
+ * \brief fancy, schmancy 12-way interleaved viterbi decoder for ATSC
+ */
+
+class atsci_viterbi_decoder {
+public:
+  static const int     NCODERS = 12;
+
+  atsci_viterbi_decoder ();
+  ~atsci_viterbi_decoder ();
+
+  //! reset all decoder states
+  void reset ();
+
+  /*!
+   * Take 12 data segments of soft decisions (floats) and
+   * produce 12 RS encoded data segments.  We work in groups of 12
+   * because that's the smallest number of segments that composes a
+   * single full cycle of the decoder mux.
+   */
+  void decode (atsc_mpeg_packet_rs_encoded out[NCODERS],
+              const atsc_soft_data_segment in[NCODERS]);
+
+
+  
+ protected:
+  typedef interleaver_fifo<unsigned char>      fifo_t;
+
+  static const int SEGMENT_SIZE = ATSC_MPEG_RS_ENCODED_LENGTH; // 207
+  static const int OUTPUT_SIZE = (SEGMENT_SIZE * 12);
+  static const int INPUT_SIZE = (ATSC_DATA_SEGMENT_LENGTH * 12);
+  
+  void decode_helper (unsigned char out[OUTPUT_SIZE],
+                     const float in[INPUT_SIZE]);
+
+  
+  single_viterbi_t     viterbi[NCODERS];
+  fifo_t               *fifo[NCODERS]; 
+  bool                 debug;
+
+};
+
+
+
+#endif /* _ATSC_VITERBI_DECODER_H_ */