initial git import

src/anetz/anetz.h

@@ -0,0 +1,47 @@
+#include "../common/sender.h"
+
+enum dsp_mode {
+	DSP_MODE_SILENCE,	/* send silence to transmitter, block audio from receiver */
+	DSP_MODE_AUDIO,		/* stream audio */
+	DSP_MODE_TONE,		/* send 2280 Hz tone 0 */
+	DSP_MODE_PAGING,	/* send four paging tones */
+};
+
+enum anetz_state {
+	ANETZ_FREI,		/* sending 2280 Hz tone */
+	ANETZ_GESPRAECH,	/* during conversation */
+	ANETZ_ANRUF,		/* phone is paged */
+};
+
+typedef struct anetz {
+	sender_t		sender;
+
+	/* sender's states */
+	enum anetz_state	state;			/* current sender's state */
+	char			station_id[8];		/* current station ID */
+	struct timer		timer;
+
+	/* dsp states */
+	enum dsp_mode		dsp_mode;		/* current mode: audio, durable tone 0 or 1, paging */
+	int			fsk_tone_coeff;		/* coefficient k = 2*cos(2*PI*f/samplerate), k << 15 */
+	int			samples_per_chunk;	/* how many samples lasts one chunk */
+	int16_t			*fsk_filter_spl;	/* array with samples_per_chunk */
+	int			fsk_filter_pos;		/* current sample position in filter_spl */
+	int			tone_detected;		/* what tone has been detected */
+	int			tone_count;		/* how long has that tone been detected */
+	double			tone_phaseshift256;	/* how much the phase of sine wave changes per sample */
+	double			tone_phase256;		/* current phase */
+	double			paging_phaseshift256[4];/* how much the phase of sine wave changes per sample */
+	double			paging_phase256[4];	/* current phase */
+	int			paging_tone;		/* current tone (0..3) in sequenced mode */
+	int			paging_count;		/* current sample count of tone in seq. mode */
+} anetz_t;
+
+
+double anetz_kanal2freq(int kanal, int unterband);
+int anetz_init(void);
+int anetz_create(const char *sounddev, int samplerate, int kanal, int loopback, double loss_volume);
+void anetz_destroy(sender_t *sender);
+void anetz_loss_indication(anetz_t *anetz);
+void anetz_receive_tone(anetz_t *anetz, int bit);
+