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155 lines
6.6 KiB
C
155 lines
6.6 KiB
C
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/*---------------------------------------------------------------------------*\
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FILE........: freedv_api_internal.h
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AUTHOR......: David Rowe
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DATE CREATED: August 2014
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This declares the structure freedv. A pointer to this structure is
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returned by the FreeDV API freedv_open() function. The pointer is used
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by the other FreeDV API functions declared in freedv_api.h. This
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structure is intended to be internal to the FreeDV API. The public
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functions are declared in freedv_api.h. Changes to this structure
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are expected. Changes (except additions) to freedv_api.h are
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discouraged.
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\*---------------------------------------------------------------------------*/
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/*
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Copyright (C) 2014 David Rowe
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All rights reserved.
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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 Lesser General Public License version 2.1, as
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published by the Free Software Foundation. This program is
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distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU Lesser 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 __FREEDV_API_INTERNAL__
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#define __FREEDV_API_INTERNAL__
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#include "codec2/varicode.h"
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#include "fsk.h"
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#include "fmfsk.h"
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#include "codec2_cohpsk.h"
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#include "codec2_fdmdv.h"
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namespace FreeDV
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{
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struct freedv {
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int mode;
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/* states for various modems we support */
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struct CODEC2 *codec2;
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struct FDMDV *fdmdv;
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struct COHPSK *cohpsk;
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struct FSK *fsk;
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struct FMFSK *fmfsk;
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struct OFDM *ofdm;
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struct LDPC *ldpc;
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struct MODEM_STATS stats;
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struct freedv_vhf_deframer * deframer; // Extracts frames from VHF stream
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struct quisk_cfFilter * ptFilter7500to8000; // Filters to change to/from 7500 and 8000 sps for 700 .... 700C
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struct quisk_cfFilter * ptFilter8000to7500;
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int n_speech_samples; // number of speech samples we need for each freedv_tx() call
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// num of speech samples output by freedv_rx() call
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int n_nom_modem_samples; // size of tx and most rx modem sample buffers
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int n_max_modem_samples; // make your rx modem sample buffers this big
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int n_nat_modem_samples; // tx modem sample block length as used by the modem before interpolation to output
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// usually the same as n_nom_modem_samples, except for 700..700C
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int modem_sample_rate; // Caller is responsible for meeting this
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int modem_symbol_rate; // Useful for ext_vco operation on 2400A and 800XA
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int clip; // non-zero for cohpsk modem output clipping for low PAPR
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unsigned char *packed_codec_bits;
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unsigned char *packed_codec_bits_tx; // for 700D we separate packed bits to maintain state due to interleaving
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int nbyte_packed_codec_bits; // keep track of size of above arrays in 700D
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int *codec_bits;
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int *tx_bits;
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int *fdmdv_bits;
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int *rx_bits;
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int n_codec_bits; // number of codec bits in a frame
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int tx_sync_bit;
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int smooth_symbols;
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int frames;
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/* test frame states -------------------------------------------------------------------------*/
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int *ptest_bits_coh;
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int *ptest_bits_coh_end;
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int test_frames; // set this baby for 1 to tx/rx test frames to look at bit error stats
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int test_frames_diversity; // 1 -> used combined carriers for error counting on 700 waveforms
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int test_frame_sync_state;
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int test_frame_sync_state_upper; // when test_frames_diveristy==0 we need extra states for upper carriers
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int test_frame_count;
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int total_bits;
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int total_bit_errors;
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int total_bits_coded;
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int total_bit_errors_coded;
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int sz_error_pattern;
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/* optional user defined function to pass error pattern when a test frame is received */
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void *error_pattern_callback_state;
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void (*freedv_put_error_pattern)(void *error_pattern_callback_state, short error_pattern[], int sz_error_pattern);
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/* Misc ---------------------------------------------------------------------------------------------*/
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int sync;
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int evenframe;
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float snr_est;
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float snr_squelch_thresh;
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int squelch_en;
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int nin;
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int verbose;
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int ext_vco; /* 2400A/800XA use external VCO flag */
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/* Varicode txt channel states ----------------------------------------------------------------------*/
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struct VARICODE_DEC varicode_dec_states;
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short tx_varicode_bits[VARICODE_MAX_BITS];
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int nvaricode_bits;
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int varicode_bit_index;
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/* interleaved LDPC OFDM states ---------------------------------------------------------------------*/
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int interleave_frames; // number of OFDM modem frames in interleaver, e.g. 1,2,4,8,16
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COMP *codeword_symbols;
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float *codeword_amps;
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int modem_frame_count_tx; // modem frame counter for tx side
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int modem_frame_count_rx; // modem frame counter for rx side
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COMP *mod_out; // output buffer of intereaved frames
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/* user defined function ptrs to produce and consume ASCII
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characters using aux txt channel */
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char (*freedv_get_next_tx_char)(void *callback_state);
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void (*freedv_put_next_rx_char)(void *callback_state, char c);
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void *callback_state;
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/* user defined functions to produce and consume protocol bits */
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/* Protocol bits are packed MSB-first */
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void (*freedv_put_next_proto)(void *callback_state, char *proto_bits_packed);
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void (*freedv_get_next_proto)(void *callback_state, char *proto_bits_packed);
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void *proto_callback_state;
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int n_protocol_bits;
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};
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} // FreeDV
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#endif
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