diff options
Diffstat (limited to 'gr-atsc/src/lib/GrAtscViterbiDecoder.cc')
-rw-r--r-- | gr-atsc/src/lib/GrAtscViterbiDecoder.cc | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/gr-atsc/src/lib/GrAtscViterbiDecoder.cc b/gr-atsc/src/lib/GrAtscViterbiDecoder.cc deleted file mode 100644 index c89b3556b..000000000 --- a/gr-atsc/src/lib/GrAtscViterbiDecoder.cc +++ /dev/null @@ -1,135 +0,0 @@ -/* -*- 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. - */ - -#include <GrAtscViterbiDecoder.h> -#include <iostream> - -// typedefs for fundamental i/o types - -typedef atsc_soft_data_segment iType; -typedef atsc_mpeg_packet_rs_encoded oType; - -static const int NUMBER_OF_OUTPUTS = 1; // # of output streams (almost always one) - - -GrAtscViterbiDecoder::GrAtscViterbiDecoder () - : VrHistoryProc<iType,oType> (NUMBER_OF_OUTPUTS), last_start(-1) -{ - // 1 + number of extra input elements at which we look. This is - // used by the superclass's forecast routine to get us the correct - // range on our inputs. - // - // We need our input to be aligned on a 12-segment boundary, - // to ensure satisfaction, ask for 11 more - history = 1 + (atsci_viterbi_decoder::NCODERS - 1); - - // any other init here. - - // Let the bottom end know we must produce output in multiples of 12 segments. - setOutputSize (atsci_viterbi_decoder::NCODERS); -} - -GrAtscViterbiDecoder::~GrAtscViterbiDecoder () -{ - // Anything that isn't automatically cleaned up... -} - -/* - * This is the real work horse. In general this interface can handle - * multiple streams of input and output, but we almost always - * use a single input and output stream. - */ - -int -GrAtscViterbiDecoder::work (VrSampleRange output, void *ao[], - VrSampleRange inputs[], void *ai[]) -{ - // If we have state that persists across invocations (e.g., we have - // instance variables that we modify), we must use the sync method - // to indicate to the scheduler that our output must be computed in - // order. This doesn't keep other things from being run in - // parallel, it just means that at any given time, there is only a - // single thread working this code, and that the scheduler will - // ensure that we are asked to produce output that is contiguous and - // that will be presented to us in order of increasing time. - - // We have state, the current state of the decoder, hence - // we must use sync. - - sync (output.index); - - // construct some nicer i/o pointers to work with. - - iType *in = ((iType **) ai)[0]; - oType *out = ((oType **) ao)[0]; - - - assert (output.size % atsci_viterbi_decoder::NCODERS == 0); - - // find the first mod 12 boundary to begin decoding - int start; - for (start = 0; start < atsci_viterbi_decoder::NCODERS; start++){ - assert (in[start].pli.regular_seg_p ()); - if ((in[start].pli.segno () % atsci_viterbi_decoder::NCODERS) == 0) - break; - } - - if (start == atsci_viterbi_decoder::NCODERS){ - // we didn't find a mod 12 boundary. There's some kind of problem - // upstream of us (not yet sync'd??) - cerr << "!!!GrAtscViterbiDecoder: no mod-12 boundary found\7\n"; - start = 0; - } - else if (start != last_start){ - cerr << "GrAtscViterbiDecoder: new starting offset = " << start - << " output.index = " << output.index << endl; - last_start = start; - } - - // We must produce output.size units of output. - - for (unsigned int i = 0; i < output.size; i += atsci_viterbi_decoder::NCODERS){ - // primitive does 12 segments at a time. - // pipeline info is handled in the primitive. - decoder.decode (&out[i], &in[i + start]); - } - -#if 0 - // FIXME paranoid check... - for (unsigned int i = 0; i < output.size; i++){ - plinfo::sanity_check (out[i].pli); - assert (out[i].pli.regular_seg_p ()); - } -#endif - -#if 0 - cerr << "@@@ GrAtscViterbiDecoder: output.index = " << output.index - << " output.size = " << output.size - << " sum = " << output.index + output.size << endl; -#endif - - // Return the number of units we produced. - // Note that for all intents and purposes, it is an error to - // produce less than you are asked for. - - return output.size; -} |