Added tx bursts preprocessing block
diff --git a/lib/transmitter/preprocess_tx_burst_impl.cc b/lib/transmitter/preprocess_tx_burst_impl.cc
new file mode 100644
index 0000000..5d3ae9a
--- /dev/null
+++ b/lib/transmitter/preprocess_tx_burst_impl.cc
@@ -0,0 +1,85 @@
+/* -*- c++ -*- */
+/* @file
+ * @author Piotr Krysik <ptrkrysik@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 <gnuradio/io_signature.h>
+#include <grgsm/gsmtap.h>
+#include <grgsm/gsm_constants.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::intern("bursts_in"));
+ message_port_register_out(pmt::intern("bursts_out"));
+
+ set_msg_handler(pmt::intern("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 burst)
+ {
+ int8_t * header_bits = (int8_t *)(pmt::blob_data(pmt::cdr(burst)));
+ int8_t * burst_bits = (int8_t *)(pmt::blob_data(pmt::cdr(burst)))+sizeof(gsmtap_hdr);
+
+ pmt::pmt_t header_bits_pmt = pmt::make_blob(header_bits,sizeof(gsmtap_hdr));
+
+ size_t burst_size = pmt::blob_length(pmt::cdr(burst))-sizeof(gsmtap_hdr);
+ if(((gsmtap_hdr*)header_bits)->sub_type == GSMTAP_BURST_ACCESS){ //cut unneeded bits from the end of access bursts
+ burst_size = ACCESS_BURST_SIZE;
+ }
+ pmt::pmt_t burst_bits_pmt = pmt::make_blob(burst_bits, burst_size);
+
+ pmt::pmt_t pdu_first_part = pmt::car(burst);
+// pmt::pmt_t new_pdu_first_part = pmt::dict_add( pdu_first_part, pmt::intern("gsmtap_header"), header_bits_pmt );
+ pmt::pmt_t new_pdu_first_part = pdu_first_part;
+
+ pmt::pmt_t new_msg = pmt::cons(new_pdu_first_part, burst_bits_pmt);
+ message_port_pub(pmt::intern("bursts_out"), new_msg);
+ }
+ } /* namespace gsm */
+} /* namespace gr */
+