X-Git-Url: https://git.gag.com/?p=debian%2Fgnuradio;a=blobdiff_plain;f=gr-atsc%2Fsrc%2Flib%2FGrAtscDeinterleaver.cc;fp=gr-atsc%2Fsrc%2Flib%2FGrAtscDeinterleaver.cc;h=357b9be38db2700776d09076a3674268965a9c4a;hp=0000000000000000000000000000000000000000;hb=fd9980f919b6f05e2fbea404fea322825ce438f0;hpb=2415ccdbf9d97878a0888bbdff30d699ae2326dd

diff --git a/gr-atsc/src/lib/GrAtscDeinterleaver.cc b/gr-atsc/src/lib/GrAtscDeinterleaver.cc
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+++ b/gr-atsc/src/lib/GrAtscDeinterleaver.cc
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+/* -*- 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 <GrAtscDeinterleaver.h>
+
+// typedefs for fundamental i/o types
+
+typedef atsc_mpeg_packet_rs_encoded	iType;
+typedef atsc_mpeg_packet_rs_encoded	oType;
+
+static const int NUMBER_OF_OUTPUTS = 1;	// # of output streams (almost always one)
+
+
+GrAtscDeinterleaver::GrAtscDeinterleaver ()
+  : VrHistoryProc<iType,oType> (NUMBER_OF_OUTPUTS)
+{
+  // 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're one-to-one input-to-output so set it to 1.
+  history = 1;	
+
+  // any other init here.
+}
+
+GrAtscDeinterleaver::~GrAtscDeinterleaver ()
+{
+  // 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 
+GrAtscDeinterleaver::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 contents of the LFSR in the randomizer, 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];
+
+
+  // We must produce output.size units of output.
+
+  for (unsigned int i = 0; i < output.size; i++){
+    // pipeline info is handled in the primitive
+    deinterleaver.deinterleave (out[i], in[i]);
+  }
+
+  // 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;
+}