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113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 F4EXB //
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// written by Edouard Griffiths //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef SDRBASE_AUDIO_AUDIOG722_H_
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#define SDRBASE_AUDIO_AUDIOG722_H_
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#include <stdint.h>
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#include "export.h"
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class SDRBASE_API AudioG722
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{
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public:
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AudioG722();
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~AudioG722();
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void init(int rate, int options);
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int encode(uint8_t g722_data[], const int16_t amp[], int len);
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private:
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struct g722_encode_state
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{
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/*! TRUE if the operating in the special ITU test mode, with the band split filters
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disabled. */
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int itu_test_mode;
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/*! TRUE if the G.722 data is packed */
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int packed;
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/*! TRUE if encode from 8k samples/second */
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int eight_k;
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/*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */
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int bits_per_sample;
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/*! Signal history for the QMF */
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int x[24];
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struct
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{
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int s;
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int sp;
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int sz;
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int r[3];
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int a[3];
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int ap[3];
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int p[3];
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int d[7];
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int b[7];
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int bp[7];
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int sg[7];
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int nb;
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int det;
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} band[2];
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unsigned int in_buffer;
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int in_bits;
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unsigned int out_buffer;
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int out_bits;
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g722_encode_state();
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void init(int rate, int options);
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};
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int16_t saturate(int32_t amp)
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{
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int16_t amp16;
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/* Hopefully this is optimized for the common case - not clipping */
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amp16 = (int16_t) amp;
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if (amp == amp16) {
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return amp16;
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}
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if (amp > INT16_MAX) {
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return INT16_MAX;
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}
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return INT16_MIN;
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}
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void block4(int band, int d);
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g722_encode_state state;
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static const int q6[32];
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static const int iln[32];
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static const int ilp[32];
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static const int wl[8];
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static const int rl42[16];
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static const int ilb[32];
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static const int qm4[16];
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static const int qm2[4];
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static const int qmf_coeffs[12];
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static const int ihn[3];
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static const int ihp[3];
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static const int wh[3];
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static const int rh2[4];
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};
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#endif /* SDRBASE_AUDIO_AUDIOG722_H_ */
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