From 2d4c77489f540a6978497d25dd3e316a2f16e9ad Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Wed, 28 Aug 2013 17:07:36 -0700
Subject: convert: added sc12 and fc32 converters

---
 host/lib/convert/convert_pack_sc12.cpp | 144 +++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 host/lib/convert/convert_pack_sc12.cpp

(limited to 'host/lib/convert/convert_pack_sc12.cpp')

diff --git a/host/lib/convert/convert_pack_sc12.cpp b/host/lib/convert/convert_pack_sc12.cpp
new file mode 100644
index 000000000..680814994
--- /dev/null
+++ b/host/lib/convert/convert_pack_sc12.cpp
@@ -0,0 +1,144 @@
+//
+// Copyright 2013 Ettus Research LLC
+//
+// This program 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.
+//
+// This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "convert_common.hpp"
+#include <uhd/utils/byteswap.hpp>
+#include <uhd/utils/msg.hpp>
+#include <boost/math/special_functions/round.hpp>
+#include <vector>
+
+using namespace uhd::convert;
+
+typedef boost::uint32_t (*towire32_type)(boost::uint32_t);
+
+struct item32_sc12_3x
+{
+    item32_t line0;
+    item32_t line1;
+    item32_t line2;
+};
+
+template <typename type, towire32_type towire>
+void convert_star_4_to_sc12_item32_3
+(
+    const std::complex<type> &in0,
+    const std::complex<type> &in1,
+    const std::complex<type> &in2,
+    const std::complex<type> &in3,
+    item32_sc12_3x &output,
+    const double scalar
+)
+{
+    const item32_t i0 = boost::int32_t(type(in0.real()*scalar)) & 0xfff;
+    const item32_t q0 = boost::int32_t(type(in0.imag()*scalar)) & 0xfff;
+
+    const item32_t i1 = boost::int32_t(type(in1.real()*scalar)) & 0xfff;
+    const item32_t q1 = boost::int32_t(type(in1.imag()*scalar)) & 0xfff;
+
+    const item32_t i2 = boost::int32_t(type(in2.real()*scalar)) & 0xfff;
+    const item32_t q2 = boost::int32_t(type(in2.imag()*scalar)) & 0xfff;
+
+    const item32_t i3 = boost::int32_t(type(in3.real()*scalar)) & 0xfff;
+    const item32_t q3 = boost::int32_t(type(in3.imag()*scalar)) & 0xfff;
+
+    const item32_t line0 = (i0 << 20) | (q0 << 8) | (i1 >> 4);
+    const item32_t line1 = (i1 << 28) | (q1 << 16) | (i2 << 4) | (q2 >> 8);
+    const item32_t line2 = (q2 << 24) | (i3 << 12) | (q3);
+
+    output.line0 = towire(line0);
+    output.line1 = towire(line1);
+    output.line2 = towire(line2);
+}
+
+template <typename type, towire32_type towire>
+struct convert_star_1_to_sc12_item32_1 : public converter
+{
+    convert_star_1_to_sc12_item32_1(void)
+    {
+        //NOP
+    }
+
+    void set_scalar(const double scalar)
+    {
+        _scalar = scalar;
+    }
+
+    void operator()(const input_type &inputs, const output_type &outputs, const size_t nsamps)
+    {
+        const std::complex<type> *input = reinterpret_cast<const std::complex<type> *>(inputs[0]);
+        item32_sc12_3x *output = reinterpret_cast<item32_sc12_3x *>(size_t(outputs[0]) & ~0x3);
+
+        //helper variables
+        size_t i = 0, o = 0;
+
+        //handle the head case
+        const size_t head_samps = size_t(outputs[0]) & 0x3;
+        switch (head_samps)
+        {
+        case 0: break; //no head
+        case 1: convert_star_4_to_sc12_item32_3<type, towire>(0, 0, 0, input[0], output[o++], _scalar); break;
+        case 2: convert_star_4_to_sc12_item32_3<type, towire>(0, 0, input[0], input[1], output[o++], _scalar); break;
+        case 3: convert_star_4_to_sc12_item32_3<type, towire>(0, input[0], input[1], input[2], output[o++], _scalar); break;
+        }
+        i += head_samps;
+
+        //convert the body
+        while (i+3 < nsamps)
+        {
+            convert_star_4_to_sc12_item32_3<type, towire>(input[i+0], input[i+1], input[i+2], input[i+3], output[o], _scalar);
+            o++; i += 4;
+        }
+
+        //handle the tail case
+        const size_t tail_samps = nsamps - i;
+        switch (tail_samps)
+        {
+        case 0: break; //no tail
+        case 1: convert_star_4_to_sc12_item32_3<type, towire>(input[i+0], 0, 0, 0, output[o], _scalar); break;
+        case 2: convert_star_4_to_sc12_item32_3<type, towire>(input[i+0], input[i+1], 0, 0, output[o], _scalar); break;
+        case 3: convert_star_4_to_sc12_item32_3<type, towire>(input[i+0], input[i+1], input[i+2], 0, output[o], _scalar); break;
+        }
+    }
+
+    double _scalar;
+};
+
+static converter::sptr make_convert_fc32_1_to_sc12_item32_le_1(void)
+{
+    return converter::sptr(new convert_star_1_to_sc12_item32_1<float, uhd::wtohx>());
+}
+
+static converter::sptr make_convert_fc32_1_to_sc12_item32_be_1(void)
+{
+    return converter::sptr(new convert_star_1_to_sc12_item32_1<float, uhd::ntohx>());
+}
+
+UHD_STATIC_BLOCK(register_convert_pack_sc12)
+{
+    //uhd::convert::register_bytes_per_item("sc12", 3/*bytes*/); //registered in unpack
+
+    uhd::convert::id_type id;
+    id.num_inputs = 1;
+    id.num_outputs = 1;
+    id.input_format = "fc32";
+
+    id.output_format = "sc12_item32_le";
+    uhd::convert::register_converter(id, &make_convert_fc32_1_to_sc12_item32_le_1, PRIORITY_GENERAL);
+
+    id.output_format = "sc12_item32_be";
+    uhd::convert::register_converter(id, &make_convert_fc32_1_to_sc12_item32_be_1, PRIORITY_GENERAL);
+}
-- 
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