//
// Copyright 2011-2012 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/>.
//

#ifndef INCLUDED_LIBUHD_CONVERT_COMMON_HPP
#define INCLUDED_LIBUHD_CONVERT_COMMON_HPP

#include <uhd/convert.hpp>
#include <uhd/utils/static.hpp>
#include <boost/cstdint.hpp>
#include <complex>

#define _DECLARE_CONVERTER(name, in_form, num_in, out_form, num_out, prio) \
    struct name : public uhd::convert::converter{ \
        static sptr make(void){return sptr(new name());} \
        double scale_factor; \
        void set_scalar(const double s){scale_factor = s;} \
        void operator()(const input_type&, const output_type&, const size_t); \
    }; \
    UHD_STATIC_BLOCK(__register_##name##_##prio){ \
        uhd::convert::id_type id; \
        id.input_format = #in_form; \
        id.num_inputs = num_in; \
        id.output_format = #out_form; \
        id.num_outputs = num_out; \
        uhd::convert::register_converter(id, &name::make, prio); \
    } \
    void name::operator()( \
        const input_type &inputs, const output_type &outputs, const size_t nsamps \
    )

#define DECLARE_CONVERTER(in_form, num_in, out_form, num_out, prio) \
    _DECLARE_CONVERTER(__convert_##in_form##_##num_in##_##out_form##_##num_out##_##prio, in_form, num_in, out_form, num_out, prio)

/***********************************************************************
 * Setup priorities
 **********************************************************************/
static const int PRIORITY_GENERAL = 0;
static const int PRIORITY_EMPTY = -1;

#ifdef __ARM_NEON__
static const int PRIORITY_LIBORC = 3;
static const int PRIORITY_SIMD = 2; //neon conversions could be implemented better, orc wins
static const int PRIORITY_TABLE = 1; //tables require large cache, so they are slower on arm
#else
static const int PRIORITY_LIBORC = 2;
static const int PRIORITY_SIMD = 3;
static const int PRIORITY_TABLE = 1;
#endif

/***********************************************************************
 * Typedefs
 **********************************************************************/
typedef std::complex<double>         fc64_t;
typedef std::complex<float>          fc32_t;
typedef std::complex<boost::int32_t> sc32_t;
typedef std::complex<boost::int16_t> sc16_t;
typedef std::complex<boost::int8_t>  sc8_t;
typedef double                       f64_t;
typedef float                        f32_t;
typedef boost::int32_t               s32_t;
typedef boost::int16_t               s16_t;
typedef boost::int8_t                s8_t;

typedef boost::uint32_t              item32_t;

typedef item32_t (*xtox_t)(item32_t);

/***********************************************************************
 * Convert xx to items32 sc16 buffer
 **********************************************************************/
template <typename T> UHD_INLINE item32_t xx_to_item32_sc16_x1(
    const std::complex<T> &num, const double scale_factor
){
    boost::uint16_t real = boost::int16_t(num.real()*float(scale_factor));
    boost::uint16_t imag = boost::int16_t(num.imag()*float(scale_factor));
    return (item32_t(real) << 16) | (item32_t(imag) << 0);
}

template <> UHD_INLINE item32_t xx_to_item32_sc16_x1(
    const sc16_t &num, const double
){
    boost::uint16_t real = boost::int16_t(num.real());
    boost::uint16_t imag = boost::int16_t(num.imag());
    return (item32_t(real) << 16) | (item32_t(imag) << 0);
}

template <xtox_t to_wire, typename T>
UHD_INLINE void xx_to_item32_sc16(
    const std::complex<T> *input,
    item32_t *output,
    const size_t nsamps,
    const double scale_factor
){
    for (size_t i = 0; i < nsamps; i++){
        const item32_t item = xx_to_item32_sc16_x1(input[i], scale_factor);
        output[i] = to_wire(item);
    }
}

/***********************************************************************
 * Convert items32 sc16 buffer to xx
 **********************************************************************/
template <typename T> UHD_INLINE std::complex<T> item32_sc16_x1_to_xx(
    const item32_t item, const double scale_factor
){
    return std::complex<T>(
        T(boost::int16_t(item >> 16)*float(scale_factor)),
        T(boost::int16_t(item >> 0)*float(scale_factor))
    );
}

template <> UHD_INLINE sc16_t item32_sc16_x1_to_xx(
    const item32_t item, const double
){
    return sc16_t(
        boost::int16_t(item >> 16), boost::int16_t(item >> 0)
    );
}

template <xtox_t to_host, typename T>
UHD_INLINE void item32_sc16_to_xx(
    const item32_t *input,
    std::complex<T> *output,
    const size_t nsamps,
    const double scale_factor
){
    for (size_t i = 0; i < nsamps; i++){
        const item32_t item_i = to_host(input[i]);
        output[i] = item32_sc16_x1_to_xx<T>(item_i, scale_factor);
    }
}

/***********************************************************************
 * Convert xx to items32 sc8 buffer
 **********************************************************************/
template <typename T> UHD_INLINE item32_t xx_to_item32_sc8_x1(
    const std::complex<T> &in0, const std::complex<T> &in1, const double scale_factor
){
    return
        (item32_t(boost::uint8_t(in0.real()*float(scale_factor))) << 8) |
        (item32_t(boost::uint8_t(in0.imag()*float(scale_factor))) << 0) |
        (item32_t(boost::uint8_t(in1.real()*float(scale_factor))) << 24) |
        (item32_t(boost::uint8_t(in1.imag()*float(scale_factor))) << 16)
    ;
}

template <> UHD_INLINE item32_t xx_to_item32_sc8_x1(
    const sc16_t &in0, const sc16_t &in1, const double
){
    return
        (item32_t(boost::uint8_t(in0.real())) << 8) |
        (item32_t(boost::uint8_t(in0.imag())) << 0) |
        (item32_t(boost::uint8_t(in1.real())) << 24) |
        (item32_t(boost::uint8_t(in1.imag())) << 16)
    ;
}

template <xtox_t to_wire, typename T>
UHD_INLINE void xx_to_item32_sc8(
    const std::complex<T> *input,
    item32_t *output,
    const size_t nsamps,
    const double scale_factor
){
    const size_t num_pairs = nsamps/2;
    for (size_t i = 0, j = 0; i < num_pairs; i++, j+=2){
        const item32_t item = xx_to_item32_sc8_x1(input[j], input[j+1], scale_factor);
        output[i] = to_wire(item);
    }

    if (nsamps != num_pairs*2){
        const item32_t item = xx_to_item32_sc8_x1(input[nsamps-1], std::complex<T>(0), scale_factor);
        output[num_pairs] = to_wire(item);
    }
}

/***********************************************************************
 * Convert items32 sc8 buffer to xx
 **********************************************************************/
template <typename T> UHD_INLINE void item32_sc8_x1_to_xx(
    const item32_t item, std::complex<T> &out0, std::complex<T> &out1, const double scale_factor
){
    out0 = std::complex<T>(
        T(boost::int8_t(item >> 8)*float(scale_factor)),
        T(boost::int8_t(item >> 0)*float(scale_factor))
    );
    out1 = std::complex<T>(
        T(boost::int8_t(item >> 24)*float(scale_factor)),
        T(boost::int8_t(item >> 16)*float(scale_factor))
    );
}

template <> UHD_INLINE void item32_sc8_x1_to_xx(
    const item32_t item, sc16_t &out0, sc16_t &out1, const double
){
    out0 = sc16_t(
        boost::int16_t(boost::int8_t(item >> 8)),
        boost::int16_t(boost::int8_t(item >> 0))
    );
    out1 = sc16_t(
        boost::int16_t(boost::int8_t(item >> 24)),
        boost::int16_t(boost::int8_t(item >> 16))
    );
}

template <xtox_t to_host, typename T>
UHD_INLINE void item32_sc8_to_xx(
    const item32_t *input,
    std::complex<T> *output,
    const size_t nsamps,
    const double scale_factor
){
    input = reinterpret_cast<const item32_t *>(size_t(input) & ~0x3);
    std::complex<T> dummy;
    size_t num_samps = nsamps;

    if ((size_t(input) & 0x3) != 0){
        const item32_t item0 = to_host(*input++);
        item32_sc8_x1_to_xx(item0, dummy, *output++, scale_factor);
        num_samps--;
    }

    const size_t num_pairs = num_samps/2;
    for (size_t i = 0, j = 0; i < num_pairs; i++, j+=2){
        const item32_t item_i = to_host(input[i]);
        item32_sc8_x1_to_xx(item_i, output[j], output[j+1], scale_factor);
    }

    if (num_samps != num_pairs*2){
        const item32_t item_n = to_host(input[num_pairs]);
        item32_sc8_x1_to_xx(item_n, output[num_samps-1], dummy, scale_factor);
    }
}

#endif /* INCLUDED_LIBUHD_CONVERT_COMMON_HPP */