1 files changed, 96 insertions, 0 deletions
diff --git a/lib/transmitter/preprocess_tx_burst_impl.cc b/lib/transmitter/preprocess_tx_burst_impl.cc
new file mode 100644
index 0000000..5fbac98
--- /dev/null
+++ b/lib/transmitter/preprocess_tx_burst_impl.cc
@@ -0,0 +1,96 @@
+/* -*- c++ -*- */
+/* @file
+ * @author Piotr Krysik <ptrkrysik@gmail.com>
+ * @author Vadim Yanitskiy <axilirator@gmail.com>
+ * @section LICENSE
+ * 
+ * Gr-gsm 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.
+ * 
+ * Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ * 
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <assert.h>
+
+#include <gnuradio/io_signature.h>
+#include <grgsm/gsm_constants.h>
+#include <grgsm/gsmtap.h>
+
+#include "preprocess_tx_burst_impl.h"
+
+namespace gr {
+  namespace gsm {
+
+    preprocess_tx_burst::sptr
+    preprocess_tx_burst::make()
+    {
+      return gnuradio::get_initial_sptr
+        (new preprocess_tx_burst_impl());
+    }
+
+    /*
+     * The private constructor
+     */
+    preprocess_tx_burst_impl::preprocess_tx_burst_impl()
+      : gr::block("preprocess_tx_burst",
+        gr::io_signature::make(0, 0, 0),
+        gr::io_signature::make(0, 0, 0))
+    {
+        message_port_register_in(pmt::mp("bursts_in"));
+        message_port_register_out(pmt::mp("bursts_out"));
+
+        set_msg_handler(pmt::mp("bursts_in"),
+          boost::bind(&preprocess_tx_burst_impl::process_burst, this, _1));
+    }
+
+    /*
+     * Our virtual destructor.
+     */
+    preprocess_tx_burst_impl::~preprocess_tx_burst_impl()
+    {
+    }
+    
+    void preprocess_tx_burst_impl::process_burst(pmt::pmt_t msg_in)
+    {
+      pmt::pmt_t blob_in = pmt::cdr(msg_in);
+
+      // Extract GSMTAP header from message
+      gsmtap_hdr *burst_hdr = (gsmtap_hdr *) pmt::blob_data(blob_in);
+
+      // Extract burst bits from message
+      uint8_t *burst_bits = (uint8_t *)
+        (pmt::blob_data(blob_in)) + sizeof(gsmtap_hdr);
+
+      // Determine and check burst length
+      size_t burst_len = pmt::blob_length(blob_in) - sizeof(gsmtap_hdr);
+      assert(burst_len == BURST_SIZE);
+
+      // The Access Burst last has reduced length
+      if (burst_hdr->sub_type == GSMTAP_BURST_ACCESS)
+        burst_len = ACCESS_BURST_SIZE;
+
+      // Prepare an output message
+      pmt::pmt_t blob_out = pmt::make_blob(burst_bits, burst_len);
+      pmt::pmt_t msg_out = pmt::cons(pmt::car(msg_in), blob_out);
+
+      /* Send a message to the output */
+      message_port_pub(pmt::mp("bursts_out"), msg_out);
+    }
+
+  } /* namespace gsm */
+} /* namespace gr */