--- /dev/null
+/* -*- 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 <GrAtscFieldSyncMux.h>
+#include <atsci_pnXXX.h>
+
+
+// typedefs for fundamental i/o types
+
+typedef atsc_data_segment iType;
+typedef atsc_data_segment oType;
+
+static const int NUMBER_OF_OUTPUTS = 1; // # of output streams (almost always one)
+
+static const int N_SAVED_SYMBOLS = GrAtscFieldSyncMux::N_SAVED_SYMBOLS;
+
+static void
+init_field_sync_common (unsigned char *p, int mask,
+ const unsigned char saved_symbols[N_SAVED_SYMBOLS])
+{
+ static const unsigned char bin_map[2] = { 1, 6 }; // map binary values to 1 of 8 levels
+
+ int i = 0;
+
+ p[i++] = bin_map[1]; // data segment sync pulse
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[1];
+
+ for (int j = 0; j < 511; j++) // PN511
+ p[i++] = bin_map[atsc_pn511[j]];
+
+ for (int j = 0; j < 63; j++) // PN63
+ p[i++] = bin_map[atsc_pn63[j]];
+
+ for (int j = 0; j < 63; j++) // PN63, toggled on field 2
+ p[i++] = bin_map[atsc_pn63[j] ^ mask];
+
+ for (int j = 0; j < 63; j++) // PN63
+ p[i++] = bin_map[atsc_pn63[j]];
+
+ p[i++] = bin_map[0]; // 24 bits of VSB8 mode identifiera
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[0];
+
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[0];
+
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[1];
+
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[1];
+
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[1];
+
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[0];
+ p[i++] = bin_map[1];
+ p[i++] = bin_map[0];
+
+
+ for (int j = 0; j < 92; j++) // 92 more bits
+ p[i++] = bin_map[atsc_pn63[j % 63]];
+
+ // now copy the last 12 symbols of the previous segment
+
+ for (int j = 0; j < N_SAVED_SYMBOLS; j++)
+ p[i++] = saved_symbols[j];
+
+ assert (i == ATSC_DATA_SEGMENT_LENGTH);
+}
+
+inline static void
+init_field_sync_1 (atsc_data_segment *s,
+ const unsigned char saved_symbols[N_SAVED_SYMBOLS])
+{
+ init_field_sync_common (&s->data[0], 0, saved_symbols);
+}
+
+inline static void
+init_field_sync_2 (atsc_data_segment *s,
+ const unsigned char saved_symbols[N_SAVED_SYMBOLS])
+
+{
+ init_field_sync_common (&s->data[0], 1, saved_symbols);
+}
+
+static void
+save_last_symbols (unsigned char saved_symbols[N_SAVED_SYMBOLS],
+ const atsc_data_segment &seg)
+{
+ for (int i = 0; i < N_SAVED_SYMBOLS; i++)
+ saved_symbols[i] = seg.data[i + ATSC_DATA_SEGMENT_LENGTH - N_SAVED_SYMBOLS];
+}
+
+
+inline static bool
+last_regular_seg_p (const plinfo &pli)
+{
+ return pli.regular_seg_p () && (pli.segno () == ATSC_DSEGS_PER_FIELD - 1);
+}
+
+
+GrAtscFieldSyncMux::GrAtscFieldSyncMux ()
+ : VrHistoryProc<iType,oType> (NUMBER_OF_OUTPUTS),
+ d_current_index (0), d_already_output_field_sync (false)
+{
+ // 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.
+ history = 1;
+
+ // any other init here.
+}
+
+GrAtscFieldSyncMux::~GrAtscFieldSyncMux ()
+{
+ // Anything that isn't automatically cleaned up...
+}
+
+void
+GrAtscFieldSyncMux::pre_initialize ()
+{
+ // we jack our output sampling frequency up to account for inserted field syncs
+ setSamplingFrequency (getInputSamplingFrequencyN (0) * 313./312.);
+}
+
+/*
+ * we need a non-standard version of forecast because our output isn't
+ * exactly 1:1 with our input.
+ */
+
+int
+GrAtscFieldSyncMux::forecast (VrSampleRange output, VrSampleRange inputs[])
+{
+ for(unsigned int i = 0; i < numberInputs; i++) {
+ inputs[i].index = d_current_index;
+ inputs[i].size = output.size;
+ }
+ return 0;
+}
+
+/*
+ * 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
+GrAtscFieldSyncMux::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, 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.
+
+ unsigned int index = 0;
+ for (unsigned int outdex = 0; outdex < output.size; outdex++){
+
+ assert (in[index].pli.regular_seg_p ());
+
+ if (!in[index].pli.first_regular_seg_p ()){
+ out[outdex] = in[index]; // just copy in to out
+
+ if (last_regular_seg_p (in[index].pli))
+ save_last_symbols (d_saved_symbols, in[index]);
+
+ index++;
+ }
+ else { // first_regular_seg_p
+ if (!d_already_output_field_sync){
+ // write out field sync...
+ atsc_data_segment field_sync;
+
+ if (in[index].pli.in_field1_p ())
+ init_field_sync_1 (&field_sync, d_saved_symbols);
+ else
+ init_field_sync_2 (&field_sync, d_saved_symbols);
+
+ // note that index doesn't advance in this branch
+ out[outdex] = field_sync;
+ d_already_output_field_sync = true;
+ }
+ else {
+ // already output field sync, now output first regular segment
+ out[outdex] = in[index];
+ index++;
+ d_already_output_field_sync = false;
+ }
+ }
+ }
+
+ d_current_index += index;
+
+ // 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;
+}
projects / debian / gnuradio / blobdiff