3 * Copyright 2002 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 #include <GrAtscFieldSyncCorrelator.h>
24 #include <create_atsci_fs_correlator.h>
25 #include <atsci_fs_correlator.h>
27 // typedefs for fundamental i/o types
32 static const int NUMBER_OF_OUTPUTS = 2; // # of output streams
35 GrAtscFieldSyncCorrelator::GrAtscFieldSyncCorrelator ()
36 : VrHistoryProc<iType,oType> (NUMBER_OF_OUTPUTS)
38 // 1 + number of extra input elements at which we look. This is
39 // used by the superclass's forecast routine to get us the correct
40 // range on our inputs.
41 // We're one-to-one input-to-output so set it to 1.
44 d_fsc = create_atsci_fs_correlator ();
47 GrAtscFieldSyncCorrelator::~GrAtscFieldSyncCorrelator ()
49 // Anything that isn't automatically cleaned up...
55 * This is the real work horse. In general this interface can handle
56 * multiple streams of input and output, but we almost always
57 * use a single input and output stream.
61 GrAtscFieldSyncCorrelator::work (VrSampleRange output, void *ao[],
62 VrSampleRange inputs[], void *ai[])
64 // If we have state that persists across invocations (e.g., we have
65 // instance variables that we modify), we must use the sync method
66 // to indicate to the scheduler that our output must be computed in
67 // order. This doesn't keep other things from being run in
68 // parallel, it just means that at any given time, there is only a
69 // single thread working this code, and that the scheduler will
70 // ensure that we are asked to produce output that is contiguous and
71 // that will be presented to us in order of increasing time.
73 // We have state, hence we must use sync.
77 // construct some nicer i/o pointers to work with.
79 iType *in = ((iType **) ai)[0];
80 oType *sample_out = ((oType **) ao)[0];
81 oType *tag_out = ((oType **) ao)[1];
84 // We must produce output.size units of output.
86 for (unsigned int i = 0; i < output.size; i++){
87 d_fsc->filter (in[i], &sample_out[i], &tag_out[i]);
90 // Return the number of units we produced.
91 // Note that for all intents and purposes, it is an error to
92 // produce less than you are asked for.