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sdrangel/sdrbase/audio/audiog722.h

112 lines
3.4 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// 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 as 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 V3 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 SDRBASE_AUDIO_AUDIOG722_H_
#define SDRBASE_AUDIO_AUDIOG722_H_
#include <stdint.h>
#include "export.h"
class SDRBASE_API AudioG722
{
public:
AudioG722();
~AudioG722();
void init(int rate, int options);
int encode(uint8_t g722_data[], const int16_t amp[], int len);
private:
struct g722_encode_state
{
/*! TRUE if the operating in the special ITU test mode, with the band split filters
disabled. */
int itu_test_mode;
/*! TRUE if the G.722 data is packed */
int packed;
/*! TRUE if encode from 8k samples/second */
int eight_k;
/*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */
int bits_per_sample;
/*! Signal history for the QMF */
int x[24];
struct
{
int s;
int sp;
int sz;
int r[3];
int a[3];
int ap[3];
int p[3];
int d[7];
int b[7];
int bp[7];
int sg[7];
int nb;
int det;
} band[2];
unsigned int in_buffer;
int in_bits;
unsigned int out_buffer;
int out_bits;
g722_encode_state();
void init(int rate, int options);
};
int16_t saturate(int32_t amp)
{
int16_t amp16;
/* Hopefully this is optimized for the common case - not clipping */
amp16 = (int16_t) amp;
if (amp == amp16) {
return amp16;
}
if (amp > INT16_MAX) {
return INT16_MAX;
}
return INT16_MIN;
}
void block4(int band, int d);
g722_encode_state state;
static const int q6[32];
static const int iln[32];
static const int ilp[32];
static const int wl[8];
static const int rl42[16];
static const int ilb[32];
static const int qm4[16];
static const int qm2[4];
static const int qmf_coeffs[12];
static const int ihn[3];
static const int ihp[3];
static const int wh[3];
static const int rh2[4];
};
#endif /* SDRBASE_AUDIO_AUDIOG722_H_ */