/* PSK31 -- transmitter class
 * (C) 1998 Hansi Reiser DL9RDZ
 */

#ifndef __PSK31_TRANSMITTER_INCLUDED
#define __PSK31_TRANSMITTER_INCLUDED

#include "psk31-coder.h"

#define DMA_BUF_BITS 7

enum { TS_INACTIVE, TS_TRANSMIT, TS_WAITFOREND };

class psk31_transmitter {
private:
	static unsigned int cwtab[58];
	psk31_coder coder;
	int transmit_state;
	//int saved_echo_char;
	//int saved_echo_timestamp;
	int audiofd;
	int cwmode;
	int qpsk;
	int lsb;
	float _txfreq;
	int txfreq;
	int txphase;
	/* process31 / filter_tx_sample */
	float txIold,txQold,txInew,txQnew;
	int stat;
	/* getnextsymbol */
	unsigned char shiftreg;     /* Transmit shift register */
	unsigned int codewordbuf;   /* Current codeword buffer */
	int useqpsk;
	int keydown;
	int echo_char, pending_sample;
	int sendchar_cwmode;
#define TXBUFSIZE 1024
	unsigned int txbuf[TXBUFSIZE], *txbuf_sta, *txbuf_end;
	char *strupr(char *str);
	int process_31();
	int filter_tx_sample(int stat);  /* 8000Hz-Process TX */
	int getnextsymbol();
	int get_buffer_entry();
	void send_cw_char(int ch);
	void putcodeword(int cw);
	void frontputcodeword(int c);
	int getcodeword();
        void unqueue_end();
	void add_echo_char( int ch, int timestamp );
	int get_echo_char( int timestamp );
	struct echo_chars {
		int ch;
		int timestamp;
	};
#define ECHO_BUFFER_LEN 64
	struct echo_chars echo_buffer[ECHO_BUFFER_LEN], *echo_start, *echo_end;

	// mode parameters: 0 or 1; -1==no change
	void set_mode(int q, int l, int cw) { 
		if(q>=0) qpsk=q;
		if(l>=0) lsb=l;
		if(cw>=0) cwmode=cw;
		coder.setmode(q, l);
	}
	void set_freq(float f) { _txfreq=f; txfreq=(int)(65536.0/8000*f); }
	int execute_cmd(int c);
	void start_execute_cmd();
	int bufferspace();

public:
	psk31_transmitter() {
		txIold=txInew=1; txQold=txQnew=0;
		txbuf_sta=txbuf; txbuf_end=txbuf;
		stat=255;
		echo_char=0;
		pending_sample=EMPTY_SAMPLE;
		set_freq(1250);
		//saved_echo_char=0;
		//saved_echo_timestamp=0;
		transmit_state=TS_INACTIVE;
		echo_start=echo_end=echo_buffer;
	}
	void get_info(int *q, int *l, int *cw, float *f) {
		if(q) *q=qpsk; if(l) *l=lsb; if(f) *f=_txfreq;
		if(cw) *cw=cwmode;
	}
	void set_audiofd(int fd) { audiofd=fd; }
	int send_char(int c);
	int send_string(char *str);
	int send_cw_string(int need_postamble, char *str);
	void sendpreamble();
	void sendpostamble();
	int processor(); /* returns TX_BUSY / NO_CHAR / sent character */
};

#endif