1 files changed, 223 insertions, 0 deletions
diff --git a/gr-fec/lib/async_decoder_impl.cc b/gr-fec/lib/async_decoder_impl.cc
new file mode 100644
index 0000000000..f5924ec1f9
--- /dev/null
+++ b/gr-fec/lib/async_decoder_impl.cc
@@ -0,0 +1,223 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "async_decoder_impl.h"
+#include <gnuradio/io_signature.h>
+#include <volk/volk.h>
+#include <stdio.h>
+
+namespace gr {
+  namespace fec {
+
+    async_decoder::sptr
+    async_decoder::make(generic_decoder::sptr my_decoder,
+                        bool packed, bool rev_pack)
+    {
+      return gnuradio::get_initial_sptr
+        (new async_decoder_impl(my_decoder, packed, rev_pack));
+    }
+
+    async_decoder_impl::async_decoder_impl(generic_decoder::sptr my_decoder,
+                                           bool packed, bool rev_pack)
+      : block("async_decoder",
+              io_signature::make(0,0,0),
+              io_signature::make(0,0,0)),
+        d_input_item_size(sizeof(float)), d_output_item_size(sizeof(char))
+    {
+      d_in_port = pmt::mp("in");
+      d_out_port = pmt::mp("out");
+
+      d_decoder = my_decoder;
+
+      if(d_decoder->get_history() > 0) {
+        throw std::runtime_error("async_decoder deploment does not support decoders with history requirements.");
+      }
+
+      d_packed = packed;
+      d_rev_pack = rev_pack;
+
+      message_port_register_in(d_in_port);
+      message_port_register_out(d_out_port);
+
+      if(d_packed) {
+        d_pack = new blocks::kernel::pack_k_bits(8);
+        set_msg_handler(d_in_port, boost::bind(&async_decoder_impl::decode_packed, this ,_1));
+      }
+      else {
+        set_msg_handler(d_in_port, boost::bind(&async_decoder_impl::decode_unpacked, this ,_1));
+      }
+
+      // The maximum frame size is set by the initial frame size of the decoder.
+      d_max_bits_in = d_decoder->get_input_size();
+      d_tmp_f32 = (float*)volk_malloc(d_max_bits_in*sizeof(float),
+                                      volk_get_alignment());
+
+      if(strncmp(d_decoder->get_input_conversion(), "uchar", 5) == 0) {
+        d_tmp_u8 = (int8_t*)volk_malloc(d_max_bits_in*sizeof(uint8_t),
+                                        volk_get_alignment());
+      }
+
+      if(d_packed) {
+        int max_bits_out = d_decoder->get_output_size();
+        d_bits_out = (uint8_t*)volk_malloc(max_bits_out*sizeof(uint8_t),
+                                           volk_get_alignment());
+      }
+    }
+
+    async_decoder_impl::~async_decoder_impl()
+    {
+      if(d_packed) {
+        delete d_pack;
+        volk_free(d_bits_out);
+      }
+
+      volk_free(d_tmp_f32);
+
+      if(strncmp(d_decoder->get_input_conversion(), "uchar", 5) == 0) {
+        volk_free(d_tmp_u8);
+      }
+    }
+
+    void
+    async_decoder_impl::decode_unpacked(pmt::pmt_t msg)
+    {
+      // extract input pdu
+      pmt::pmt_t meta(pmt::car(msg));
+      pmt::pmt_t bits(pmt::cdr(msg));
+
+      // Watch out for this diff. It might be over-specializing to the
+      // CC decoder in terminated mode that has an extra rate(K-1)
+      // bits added on to the transmitted frame.
+      int diff = d_decoder->rate()*d_decoder->get_input_size() - d_decoder->get_output_size();
+
+      int nbits_in = pmt::length(bits);
+      int nbits_out = nbits_in*d_decoder->rate() - diff;
+
+      // Check here if the frame size is larger than what we've
+      // allocated for in the constructor.
+      if(nbits_in > d_max_bits_in) {
+        throw std::runtime_error("async_decoder: Received frame larger than max frame size.");
+      }
+
+      d_decoder->set_frame_size(nbits_out);
+
+      size_t o0(0);
+      const float* f32in = pmt::f32vector_elements(bits, o0);
+      pmt::pmt_t outvec(pmt::make_u8vector(nbits_out, 0x00));
+      uint8_t* u8out = pmt::u8vector_writable_elements(outvec, o0);
+
+      if(strncmp(d_decoder->get_input_conversion(), "uchar", 5) == 0) {
+        volk_32f_s32f_multiply_32f(d_tmp_f32, f32in, 48.0f, nbits_in);
+      }
+      else {
+        memcpy(d_tmp_f32, f32in, nbits_in*sizeof(float));
+      }
+
+      if(d_decoder->get_shift() != 0) {
+        for(int n = 0; n < nbits_in; n++)
+          d_tmp_f32[n] += d_decoder->get_shift();
+      }
+
+      if(strncmp(d_decoder->get_input_conversion(), "uchar", 5) == 0) {
+        //volk_32f_s32f_convert_8i(d_tmp_u8, d_tmp_f32, 1, nbits_in);
+        for(int n = 0; n < nbits_in; n++)
+          d_tmp_u8[n] = static_cast<uint8_t>(d_tmp_f32[n]);
+
+        d_decoder->generic_work((void*)d_tmp_u8, (void*)u8out);
+      }
+      else {
+        d_decoder->generic_work((void*)d_tmp_f32, (void*)u8out);
+      }
+
+      message_port_pub(d_out_port, pmt::cons(meta, outvec));
+    }
+
+    void
+    async_decoder_impl::decode_packed(pmt::pmt_t msg)
+    {
+      // extract input pdu
+      pmt::pmt_t meta(pmt::car(msg));
+      pmt::pmt_t bits(pmt::cdr(msg));
+
+      size_t o0 = 0;
+      int nbits_in = pmt::length(bits);
+      int nbits_out = nbits_in*d_decoder->rate();
+      int nbytes_out = nbits_out/8;
+
+      // Check here if the frame size is larger than what we've
+      // allocated for in the constructor.
+      if(nbits_in > d_max_bits_in) {
+        throw std::runtime_error("async_decoder: Received frame larger than max frame size.");
+      }
+
+      d_decoder->set_frame_size(nbits_out);
+
+      pmt::pmt_t outvec(pmt::make_u8vector(nbytes_out, 0x00));
+      uint8_t* bytes_out = pmt::u8vector_writable_elements(outvec, o0);
+      const float* f32in = pmt::f32vector_elements(bits, o0);
+
+      if(strncmp(d_decoder->get_input_conversion(), "uchar", 5) == 0) {
+        volk_32f_s32f_multiply_32f(d_tmp_f32, f32in, 48.0f, nbits_in);
+      }
+      else {
+        memcpy(d_tmp_f32, f32in, nbits_in*sizeof(float));
+      }
+
+      if(d_decoder->get_shift() != 0) {
+        for(int n = 0; n < nbits_in; n++)
+          d_tmp_f32[n] += d_decoder->get_shift();
+      }
+
+      if(strncmp(d_decoder->get_input_conversion(), "uchar", 5) == 0) {
+        //volk_32f_s32f_convert_8i(d_tmp_u8, d_tmp_f32, 1.0, nbits_in);
+        for(int n = 0; n < nbits_in; n++)
+          d_tmp_u8[n] = static_cast<uint8_t>(d_tmp_f32[n]);
+
+        d_decoder->generic_work((void*)d_tmp_u8, (void*)d_bits_out);
+      }
+      else {
+        d_decoder->generic_work((void*)d_tmp_f32, (void*)d_bits_out);
+      }
+
+      if(d_rev_pack)
+        d_pack->pack_rev(bytes_out, d_bits_out, nbytes_out);
+      else
+        d_pack->pack(bytes_out, d_bits_out, nbytes_out);
+
+      message_port_pub(d_out_port,  pmt::cons(meta, outvec));
+    }
+
+    int
+    async_decoder_impl::general_work(int noutput_items,
+                                     gr_vector_int& ninput_items,
+                                     gr_vector_const_void_star &input_items,
+                                     gr_vector_void_star &output_items)
+    {
+      return noutput_items;
+    }
+
+  } /* namespace fec */
+} /* namespace gr */