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/* -*- c++ -*- */
/*
* Copyright 2005,2011,2014 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
extern "C" {
#include "codec2/codec2.h"
}
#include "codec2_encode_sp_impl.h"
#include <gnuradio/io_signature.h>
#include <stdexcept>
#include <iostream>
#include <iomanip>
namespace gr {
namespace vocoder {
codec2_encode_sp::sptr
codec2_encode_sp::make(int mode)
{
CODEC2 *codec2;
int samples_per_frame, bits_per_frame;
// Check the number of input samples and output bits per frame.
codec2 = codec2_create(mode);
samples_per_frame = codec2_samples_per_frame(codec2);
bits_per_frame = codec2_bits_per_frame(codec2);
codec2_destroy(codec2);
return gnuradio::get_initial_sptr
(new codec2_encode_sp_impl(mode, samples_per_frame, bits_per_frame));
}
codec2_encode_sp_impl::codec2_encode_sp_impl(int mode, int samples_per_frame, int bits_per_frame)
: sync_decimator("vocoder_codec2_encode_sp",
io_signature::make(1, 1, sizeof(short)),
io_signature::make(1, 1, bits_per_frame * sizeof(char)),
samples_per_frame),
d_frame_buf((bits_per_frame + 7) / 8, 0)
{
if((d_codec2 = codec2_create(mode)) == 0)
throw std::runtime_error("codec2_encode_sp_impl: codec2_create failed");
d_samples_per_frame = samples_per_frame;
d_bits_per_frame = bits_per_frame;
}
codec2_encode_sp_impl::~codec2_encode_sp_impl()
{
codec2_destroy(d_codec2);
}
int
codec2_encode_sp_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const short *in = (const short*)input_items[0];
unsigned char *out = (unsigned char*)output_items[0];
for(int i = 0; i < noutput_items; i++) {
codec2_encode(d_codec2, &d_frame_buf[0], const_cast<short*>(in));
unpack_frame((const unsigned char *) &d_frame_buf[0], out);
in += d_samples_per_frame;
out += d_bits_per_frame * sizeof(char);
}
return noutput_items;
}
void
codec2_encode_sp_impl::unpack_frame(const unsigned char *packed, unsigned char *out)
{
int byte_idx = 0, bit_idx = 0;
for(int k = 0; k < d_bits_per_frame; k++) {
out[k] = (packed[byte_idx] >> (7-bit_idx)) & 0x01;
bit_idx = (bit_idx + 1) % 8;
if (bit_idx == 0) {
byte_idx++;
}
}
}
} /* namespace vocoder */
} /* namespace gr */
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