/usr/include/codec2/freedv_api_internal.h is in libcodec2-dev 0.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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FILE........: freedv_api_internal.h
AUTHOR......: David Rowe
DATE CREATED: August 2014
This declares the structure freedv. A pointer to this structure is
returned by the FreeDV API freedv_open() function. The pointer is used
by the other FreeDV API functions declared in freedv_api.h. This
structure is intended to be internal to the FreeDV API. The public
functions are declared in freedv_api.h. Changes to this structure
are expected. Changes (except additions) to freedv_api.h are
discouraged.
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2014 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2.1, as
published by the Free Software Foundation. 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 for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef __cplusplus
extern "C" {
#endif
#ifndef __FREEDV__
#include "varicode.h"
#include "codec2_fdmdv.h"
#include "codec2_cohpsk.h"
struct quisk_cfFilter { // Structure to hold the static data for FIR filters
float * dCoefs; // filter coefficients
int nBuf; // dimension of cBuf
int nTaps; // dimension of dSamples, cSamples, dCoefs
int decim_index; // index of next sample for decimation
COMP * cSamples; // storage for old samples
COMP * ptcSamp; // next available position in cSamples
COMP * cBuf; // auxillary buffer for interpolation
} ;
static int quisk_cfInterpDecim(COMP *, int, struct quisk_cfFilter *, int, int);
static void quisk_filt_cfInit(struct quisk_cfFilter *, float *, int);
static void quisk_filt_destroy(struct quisk_cfFilter *);
static float quiskFilt120t480[480];
struct freedv {
int mode;
struct CODEC2 *codec2;
struct FDMDV *fdmdv;
struct MODEM_STATS stats;
struct COHPSK *cohpsk;
int n_speech_samples;
int n_nom_modem_samples; // size of tx and most rx modem sample buffers
int n_max_modem_samples; // make your rx modem sample buffers this big
int modem_sample_rate; // ATM caller is responsible for meeting this (TBC)
int clip; // non-zero for cohpsk modem output clipping for low PAPR
unsigned char *packed_codec_bits;
int *codec_bits;
int *tx_bits;
int *fdmdv_bits;
int *rx_bits;
int tx_sync_bit;
int smooth_symbols;
float *prev_rx_bits;
int *ptest_bits_coh;
int *ptest_bits_coh_end;
int test_frames; // set this baby for 1 to tx/rx test frames to look at bit error stats
int test_frame_sync_state;
int test_frame_count;
int total_bits;
int total_bit_errors;
int sz_error_pattern;
/* optional user defined function to pass error pattern when a test frame is received */
void *error_pattern_callback_state;
void (*freedv_put_error_pattern)(void *error_pattern_callback_state, short error_pattern[], int sz_error_pattern);
int sync;
int evenframe;
float snr_est;
float snr_squelch_thresh;
int squelch_en;
int nin;
struct VARICODE_DEC varicode_dec_states;
short tx_varicode_bits[VARICODE_MAX_BITS];
int nvaricode_bits;
int varicode_bit_index;
/* user defined function ptrs to produce and consume ASCII
characters using aux txt channel */
char (*freedv_get_next_tx_char)(void *callback_state);
void (*freedv_put_next_rx_char)(void *callback_state, char c);
void *callback_state;
/* New in version 0.5 */
struct quisk_cfFilter * ptFilter7500to8000; // Filters to change to/from 7500 and 8000 sps
struct quisk_cfFilter * ptFilter8000to7500;
int n_nat_modem_samples; // tx modem sample block length as used by the modem before interpolation to output
};
// FIR filter suitable for changing rates 7500 to/from 8000
// Sample 120000 Hz, pass 2700, stop 3730, ripple 0.1dB, atten 100 dB. Stop 0.03108.
static float quiskFilt120t480[480] = { -0.000005050567303837, -0.000000267011791999, 0.000000197734700398, 0.000001038946634000,
0.000002322193058869, 0.000004115682735322, 0.000006499942123311, 0.000009551098482930, 0.000013350669444763,
0.000017966192635412, 0.000023463361155584, 0.000029885221425020, 0.000037271082107518, 0.000045630720487935,
0.000054970017069384, 0.000065233162392019, 0.000076360900545177, 0.000088271373315159, 0.000100818605854714,
0.000113853476544409, 0.000127174196746337, 0.000140558396336177, 0.000153744508371709, 0.000166450784469067,
0.000178368313347299, 0.000189176709991702, 0.000198541881389953, 0.000206128795372885, 0.000211604878787747,
0.000214655997661182, 0.000214994859281552, 0.000212358734245594, 0.000206539880117977, 0.000197379393194548,
0.000184780318878738, 0.000168719942655099, 0.000149250512353807, 0.000126511346757621, 0.000100726393185629,
0.000072210925236429, 0.000041365841965015, 0.000008680571408025, -0.000025277165852799, -0.000059865389594949,
-0.000094384355854646, -0.000128080670195777, -0.000160170174848483, -0.000189854272533545, -0.000216333899003825,
-0.000238836419299503, -0.000256632149501508, -0.000269058714331757, -0.000275541485292432, -0.000275614059005332,
-0.000268937472718753, -0.000255317038867589, -0.000234717772155001, -0.000207273956099563, -0.000173297342436372,
-0.000133280012107173, -0.000087895370243821, -0.000037986085678081, 0.000015440388211825, 0.000071232572821451,
0.000128114399130489, 0.000184710477990398, 0.000239577162514028, 0.000291234779803098, 0.000338204791740229,
0.000379047713684221, 0.000412403761615261, 0.000437031818051652, 0.000451848709179591, 0.000455966225408344,
0.000448726371643413, 0.000429729020814434, 0.000398857326863837, 0.000356297600912998, 0.000302547334727027,
0.000238422248479072, 0.000165048886226905, 0.000083853091464077, -0.000003462782744354, -0.000094949813106744,
-0.000188451833293202, -0.000281651282503015, -0.000372121907291206, -0.000457387566635848, -0.000534985542936898,
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-0.000719899536922384, -0.000689709694056092, -0.000640319946685634, -0.000572115873292030, -0.000485996080304965,
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0.000294790953130229, 0.000441441918072383, 0.000583164190168290, 0.000716029226064227, 0.000836164238172957,
0.000939856052624227, 0.001023657909064450, 0.001084492755093968, 0.001119751426837743, 0.001127383039339373,
0.001105974243787613, 0.001054815583369999, 0.000973950761085690, 0.000864209315714227, 0.000727219011746881,
0.000565398080608305, 0.000381924396468366, 0.000180685902835315, -0.000033793183292569, -0.000256444114966522,
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0.000805591531546815, 0.001134152328775355, 0.001446279849797673, 0.001733071409562941, 0.001985924997799762,
0.002196778054604388, 0.002358342626407065, 0.002464328098407475, 0.002509648218888532, 0.002490604086803692,
0.002405037734357425, 0.002252452724297770, 0.002034094661603120, 0.001752990365583534, 0.001413941154886139,
0.001023470495638453, 0.000589723521647734, 0.000122320866350319, -0.000367832138027160, -0.000868777013398284,
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-0.001299757227227888, -0.000621437066532776, 0.000104706515738248, 0.000861849931067767, 0.001631595707499856,
0.002394368911341672, 0.003129858565588139, 0.003817496679992245, 0.004436963307209760, 0.004968707287606522,
0.005394469536085115, 0.005697797543539088, 0.005864537618023589, 0.005883292537600076, 0.005745832319314692,
0.005447447099071761, 0.004987231255534477, 0.004368289529377007, 0.003597859022418248, 0.002687338851256991,
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0.012262093950265378, 0.015731539846483594, 0.019284344624007944, 0.022871886384520687, 0.026443706729191677,
0.029948406200633094, 0.033334570666910354, 0.036551709955124537, 0.039551189200810140, 0.042287133974308874,
0.044717290029466283, 0.046803820535016104, 0.048514022996355009, 0.049820951883635139, 0.050703932928426454,
0.051148959210315710, 0.051148959210315710, 0.050703932928426454, 0.049820951883635139, 0.048514022996355009,
0.046803820535016104, 0.044717290029466283, 0.042287133974308874, 0.039551189200810140, 0.036551709955124537,
0.033334570666910354, 0.029948406200633094, 0.026443706729191677, 0.022871886384520687, 0.019284344624007944,
0.015731539846483594, 0.012262093950265378, 0.008921944932552510, 0.005753566158586979, 0.002795265196543707,
0.000080576968834213, -0.002362238055733795, -0.004510582323649121, -0.006347789704693751, -0.007863270920348924,
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0.000511956075882180, 0.001652226293162047, 0.002687338851256991, 0.003597859022418248, 0.004368289529377007,
0.004987231255534477, 0.005447447099071761, 0.005745832319314692, 0.005883292537600076, 0.005864537618023589,
0.005697797543539088, 0.005394469536085115, 0.004968707287606522, 0.004436963307209760, 0.003817496679992245,
0.003129858565588139, 0.002394368911341672, 0.001631595707499856, 0.000861849931067767, 0.000104706515738248,
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0.002252452724297770, 0.002405037734357425, 0.002490604086803692, 0.002509648218888532, 0.002464328098407475,
0.002358342626407065, 0.002196778054604388, 0.001985924997799762, 0.001733071409562941, 0.001446279849797673,
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0.001054815583369999, 0.001105974243787613, 0.001127383039339373, 0.001119751426837743, 0.001084492755093968,
0.001023657909064450, 0.000939856052624227, 0.000836164238172957, 0.000716029226064227, 0.000583164190168290,
0.000441441918072383, 0.000294790953130229, 0.000147092077716480, 0.000002082667095075, -0.000136731311264191,
-0.000266155252511831, -0.000383371840261246, -0.000485996080304965, -0.000572115873292030, -0.000640319946685634,
-0.000689709694056092, -0.000719899536922384, -0.000731002305621048, -0.000723604675185869, -0.000698728981427767,
-0.000657788245032425, -0.000602532044011899, -0.000534985542936898, -0.000457387566635848, -0.000372121907291206,
-0.000281651282503015, -0.000188451833293202, -0.000094949813106744, -0.000003462782744354, 0.000083853091464077,
0.000165048886226905, 0.000238422248479072, 0.000302547334727027, 0.000356297600912998, 0.000398857326863837,
0.000429729020814434, 0.000448726371643413, 0.000455966225408344, 0.000451848709179591, 0.000437031818051652,
0.000412403761615261, 0.000379047713684221, 0.000338204791740229, 0.000291234779803098, 0.000239577162514028,
0.000184710477990398, 0.000128114399130489, 0.000071232572821451, 0.000015440388211825, -0.000037986085678081,
-0.000087895370243821, -0.000133280012107173, -0.000173297342436372, -0.000207273956099563, -0.000234717772155001,
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0.000041365841965015, 0.000072210925236429, 0.000100726393185629, 0.000126511346757621, 0.000149250512353807,
0.000168719942655099, 0.000184780318878738, 0.000197379393194548, 0.000206539880117977, 0.000212358734245594,
0.000214994859281552, 0.000214655997661182, 0.000211604878787747, 0.000206128795372885, 0.000198541881389953,
0.000189176709991702, 0.000178368313347299, 0.000166450784469067, 0.000153744508371709, 0.000140558396336177,
0.000127174196746337, 0.000113853476544409, 0.000100818605854714, 0.000088271373315159, 0.000076360900545177,
0.000065233162392019, 0.000054970017069384, 0.000045630720487935, 0.000037271082107518, 0.000029885221425020,
0.000023463361155584, 0.000017966192635412, 0.000013350669444763, 0.000009551098482930, 0.000006499942123311,
0.000004115682735322, 0.000002322193058869, 0.000001038946634000, 0.000000197734700398, -0.000000267011791999,
-0.000005050567303837 };
#endif
#ifdef __cplusplus
}
#endif
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