input-common.h

/*
 * input-common.h
 *
 * Copyright (c) 2015-2021 Tomasz Lemiech <szpajder@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, either 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 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 _INPUT_COMMON_H
#define _INPUT_COMMON_H 1
#include <pthread.h>
#include <libconfig.h++>

#ifdef __MINGW32__
  #define MODULE_EXPORT extern "C" __declspec(dllexport)
#else
  #if __GNUC__ >= 4
    #define MODULE_EXPORT extern "C" __attribute__((visibility("default")))
  #else
    #define MODULE_EXPORT extern "C"
  #endif
#endif

typedef enum {
	SFMT_UNDEF = 0,
	SFMT_U8,
	SFMT_S8,
	SFMT_S16,
	SFMT_F32
} sample_format_t;
#define SAMPLE_FORMAT_CNT 5

typedef enum {
	INPUT_UNKNOWN = 0,
	INPUT_INITIALIZED,
	INPUT_RUNNING,
	INPUT_FAILED,
	INPUT_STOPPED,
	INPUT_DISABLED
} input_state_t;
#define INPUT_STATE_CNT 6

typedef struct input_t input_t;

struct input_t {
	unsigned char *buffer;
	void *dev_data;
	size_t buf_size, bufs, bufe;
	size_t overflow_count;
	input_state_t state;
	sample_format_t sfmt;
	float fullscale;
	int bytes_per_sample;
	int sample_rate;
	int centerfreq;
	int (*parse_config)(input_t * const input, libconfig::Setting &cfg);
	int (*init)(input_t * const input);
	void *(*run_rx_thread)(void *input_ptr);	// to be launched via pthread_create()
	int (*set_centerfreq)(input_t * const input, int const centerfreq);
	int (*stop)(input_t * const input) ;
	pthread_t rx_thread;
	pthread_mutex_t buffer_lock;
};

input_t *input_new(char const * const type);
int input_init(input_t * const input);
int input_parse_config(input_t * const input, libconfig::Setting &cfg);
int input_start(input_t * const input);
int input_set_centerfreq(input_t * const input, int const centerfreq);
int input_stop(input_t * const input);

#endif // _INPUT_COMMON_H