1 files changed, 146 insertions, 0 deletions
diff --git a/src/dabInputPrbs.cpp b/src/dabInputPrbs.cpp
new file mode 100644
index 0000000..3b7a0dc
--- /dev/null
+++ b/src/dabInputPrbs.cpp
@@ -0,0 +1,146 @@
+/*
+   Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
+   Research Center Canada)
+   */
+/*
+   This file is part of CRC-DabMux.
+
+   CRC-DabMux 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 of the
+   License, or (at your option) any later version.
+
+   CRC-DabMux 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 CRC-DabMux.  If not, see <http://www.gnu.org/licenses/>.
+   */
+
+#include "dabInputPrbs.h"
+
+#include <string.h>
+#include <limits.h>
+#include <stdlib.h>
+
+
+#ifdef HAVE_FORMAT_RAW
+#   ifdef HAVE_INPUT_PRBS
+
+
+struct dabInputOperations dabInputPrbsOperations = {
+    dabInputPrbsInit,
+    dabInputPrbsOpen,
+    NULL,
+    dabInputPrbsRead,
+    NULL,
+    NULL,
+    dabInputPrbsReadFrame,
+    dabInputPrbsBitrate,
+    dabInputPrbsClose,
+    dabInputPrbsClean,
+    dabInputPrbsRewind,
+};
+
+
+int dabInputPrbsInit(void** args)
+{
+    prbs_data* data = new prbs_data;
+
+    memset(data, 0, sizeof(*data));
+
+    *args = data;
+    return 0;
+}
+
+
+int dabInputPrbsOpen(void* args, const char* name)
+{
+    prbs_data* data = (prbs_data*)args;
+
+    if (*name != ':') {
+        etiLog.print(TcpLog::ERR,
+                "Sorry, PRBS address format is prbs://:polynomial.\n");
+        errno = EINVAL;
+        return -1;
+    }
+
+    long polynomial = strtol(++name, (char **)NULL, 10);
+    if ((polynomial == LONG_MIN) || (polynomial == LONG_MAX)) {
+        etiLog.print(TcpLog::ERR, "can't convert polynomial number %s\n", name);
+        errno = EINVAL;
+        return -1;
+    }
+    if (polynomial == 0) {
+        etiLog.print(TcpLog::ERR, "you must specify a polynomial number\n");
+        errno = EINVAL;
+        return -1;
+    }
+    
+    data->polynomial = polynomial;
+    data->accum = 0;
+    gen_prbs_table(data);
+    gen_weight_table(data);
+    dabInputPrbsRewind(args);
+
+    return 0;
+}
+
+
+int dabInputPrbsRead(void* args, void* buffer, int size)
+{
+    prbs_data* data = (prbs_data*)args;
+	unsigned char* cbuffer = reinterpret_cast<unsigned char*>(buffer);
+
+    for(int i = 0; i < size; ++i) {
+        data->accum = update_prbs(args);
+        *(cbuffer++) = (unsigned char)(data->accum & 0xff);
+    }
+
+    return size;
+}
+
+
+int dabInputPrbsReadFrame(dabInputOperations* ops, void* args,
+        void* buffer, int size)
+{
+    return ops->read(args, buffer, size);
+}
+
+
+int dabInputPrbsBitrate(dabInputOperations* ops, void* args, int bitrate)
+{
+    return bitrate;
+}
+
+
+int dabInputPrbsClose(void* args)
+{
+    return 0;
+}
+
+
+int dabInputPrbsClean(void** args)
+{
+    delete (prbs_data*)(*args);
+    return 0;
+}
+
+
+int dabInputPrbsRewind(void* args)
+{
+    prbs_data* data = (prbs_data*)args;
+
+    while (data->accum < data->polynomial) {
+        data->accum <<= 1;
+        data->accum |= 1;
+    }
+
+    return 0;
+}
+
+
+#   endif
+#endif