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/* -*- c++ -*- */
/*
* Copyright 2005,2011,2013,2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
extern "C" {
#include "codec2/codec2.h"
}
#include "codec2_decode_ps_impl.h"
#include <gnuradio/io_signature.h>
#include <assert.h>
#include <stdexcept>
namespace gr {
namespace vocoder {
codec2_decode_ps::sptr codec2_decode_ps::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::make_block_sptr<codec2_decode_ps_impl>(
mode, samples_per_frame, bits_per_frame);
}
codec2_decode_ps_impl::codec2_decode_ps_impl(int mode,
int samples_per_frame,
int bits_per_frame)
: sync_interpolator("vocoder_codec2_decode_ps",
io_signature::make(1, 1, bits_per_frame * sizeof(char)),
io_signature::make(1, 1, sizeof(short)),
samples_per_frame),
d_frame_buf((bits_per_frame + 7) / 8, 0)
{
if ((d_codec2 = codec2_create(mode)) == 0)
throw std::runtime_error("codec2_decode_ps_impl: codec2_create failed");
d_samples_per_frame = samples_per_frame;
d_bits_per_frame = bits_per_frame;
d_bytes_per_frame = (bits_per_frame + 7) / 8;
}
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 % d_samples_per_frame) == 0);
for (int i = 0; i < noutput_items; i += d_samples_per_frame) {
pack_frame(in, &d_frame_buf[0]);
codec2_decode(d_codec2, out, const_cast<unsigned char*>(&d_frame_buf[0]));
in += d_bits_per_frame * sizeof(char);
out += d_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, d_bytes_per_frame);
int byte_idx = 0, bit_idx = 0;
for (int k = 0; k < d_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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