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/* -*- c++ -*- */
/*
* Copyright 2005,2011,2013,2014 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 "codec2_decode_ps_impl.h"
extern "C" {
#include "codec2/codec2.h"
}
#include <gnuradio/io_signature.h>
#include <stdexcept>
#include <assert.h>
namespace gr {
namespace vocoder {
codec2_decode_ps::sptr
codec2_decode_ps::make()
{
return gnuradio::get_initial_sptr
(new codec2_decode_ps_impl());
}
codec2_decode_ps_impl::codec2_decode_ps_impl ()
: sync_interpolator("vocoder_codec2_decode_ps",
io_signature::make(1, 1, CODEC2_BITS_PER_FRAME * sizeof(char)),
io_signature::make (1, 1, sizeof(short)),
CODEC2_SAMPLES_PER_FRAME),
d_frame_buf(CODEC2_BYTES_PER_FRAME, 0)
{
if((d_codec2 = codec2_create()) == 0)
throw std::runtime_error("codec2_decode_ps_impl: codec2_create failed");
}
codec2_decode_ps_impl::~codec2_decode_ps_impl()
{
codec2_destroy(d_codec2);
}
int
codec2_decode_ps_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const unsigned char *in = (const unsigned char*)input_items[0];
short *out = (short *) output_items[0];
assert((noutput_items % CODEC2_SAMPLES_PER_FRAME) == 0);
for(int i = 0; i < noutput_items; i += CODEC2_SAMPLES_PER_FRAME) {
pack_frame(in, &d_frame_buf[0]);
codec2_decode (d_codec2, out, const_cast<unsigned char*>(&d_frame_buf[0]));
in += CODEC2_BITS_PER_FRAME * sizeof (char);
out += CODEC2_SAMPLES_PER_FRAME;
}
return noutput_items;
}
void
codec2_decode_ps_impl::pack_frame(const unsigned char *in_unpacked, unsigned char *out_packed)
{
memset((void *) &d_frame_buf[0], 0x00, CODEC2_BYTES_PER_FRAME);
int byte_idx = 0, bit_idx = 0;
for(int k = 0; k < CODEC2_BITS_PER_FRAME; k++) {
out_packed[byte_idx] |= ((in_unpacked[k] & 0x01) << (7-bit_idx));
bit_idx = (bit_idx + 1) % 8;
if (bit_idx == 0) {
byte_idx++;
}
}
}
} /* namespace vocoder */
} /* namespace gr */
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