90 lines
3.6 KiB
C
90 lines
3.6 KiB
C
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#include "../libwave/wave.h"
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#include "../libsamplerate/samplerate.h"
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#include "../libemphasis/emphasis.h"
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#include "../libjitter/jitter.h"
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#include "../libfm/fm.h"
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#include "../libam/am.h"
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#include "../libdisplay/display.h"
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enum modulation {
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MODULATION_NONE = 0,
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MODULATION_FM,
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MODULATION_AM_DSB,
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MODULATION_AM_USB,
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MODULATION_AM_LSB,
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};
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enum audio_mode {
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AUDIO_MODE_NONE = 0,
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AUDIO_MODE_WAVEFILE,
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AUDIO_MODE_AUDIODEV,
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AUDIO_MODE_TESTTONE,
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};
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typedef struct radio {
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/* modes */
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int latspl; /* maximum number of samples */
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enum modulation modulation; /* modulation type */
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enum audio_mode tx_audio_mode; /* mode for audio source */
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enum audio_mode rx_audio_mode; /* mode for audio sink */
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double volume; /* volume change (gain/dampen) */
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int stereo; /* use stere FM */
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int rds, rds2; /* use RDS */
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int emphasis; /* use pre-/de-emphasis with FM */
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/* audio stage */
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double tx_audio_samplerate; /* sample rate of audio source */
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double rx_audio_samplerate; /* sample rate of audio sink */
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int tx_audio_channels; /* number of channels of audio source */
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int rx_audio_channels; /* number of channels of audio sink */
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double audio_bandwidth; /* audio bandwidth */
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const char *tx_wave_file; /* wave file name of source */
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const char *rx_wave_file; /* wave file name of sink */
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wave_play_t wave_tx_play; /* wave playback process */
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wave_rec_t wave_rx_rec; /* wave record process */
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void *tx_sound; /* sound card process */
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void *rx_sound; /* sound card process */
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jitter_t tx_dejitter[2]; /* jitter buffer when reading from sound card */
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jitter_t rx_dejitter[2]; /* jitter buffer when writing to sound card */
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sample_t *testtone[2]; /* test tone sample */
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int testtone_length;
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int testtone_pos;
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dispwav_t dispwav[2]; /* display wave form */
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/* signal stage */
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double signal_samplerate;
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double signal_bandwidth;
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samplerate_t tx_resampler[2]; /* resampling from audio rate to signal rate (two channels) */
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samplerate_t rx_resampler[2]; /* resampling from signal rate to audi rate (two channels) */
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emphasis_t fm_emphasis[2]; /* FM pre emphasis */
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double fm_deviation; /* deviation of fm signal */
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fm_mod_t fm_mod; /* FM modulation */
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fm_demod_t fm_demod; /* FM modulation */
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double pilot_phasestep; /* phase change of pilot tone for each sample */
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double tx_pilot_phase; /* current phase of tx sine */
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double rx_pilot_phase; /* current phase of rx mixer */
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iir_filter_t tx_dc_removal[2]; /* AM/FM DC level removal */
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iir_filter_t tx_am_bw_limit; /* AM bandwidth limiter */
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iir_filter_t rx_lp_pilot_I; /* low pass filter for pilot tone extraction */
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iir_filter_t rx_lp_pilot_Q; /* low pass filter for pilot tone extraction */
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iir_filter_t rx_lp_sum; /* filter sum signal of stereo */
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iir_filter_t rx_lp_diff; /* filter differential signal of stereo */
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am_mod_t am_mod; /* AM modulation */
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am_demod_t am_demod; /* AM modulation */
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/* buffers */
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sample_t *audio_buffer;
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int audio_buffer_size;
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sample_t *signal_buffer;
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uint8_t *signal_power_buffer;
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int signal_buffer_size;
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sample_t *I_buffer;
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sample_t *Q_buffer;
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sample_t *carrier_buffer;
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} radio_t;
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int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant, double volume, int stereo, int rds, int rds2);
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void radio_exit(radio_t *radio);
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int radio_start(radio_t *radio);
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int radio_tx(radio_t *radio, float *baseband, int num);
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int radio_rx(radio_t *radio, float *baseband, int num);
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