1 files changed, 46 insertions, 0 deletions
diff --git a/src/ss5/dsp.h b/src/ss5/dsp.h
new file mode 100644
index 0000000..aa58dea
--- /dev/null
+++ b/src/ss5/dsp.h
@@ -0,0 +1,46 @@
+
+struct ss5_endpoint;
+
+typedef struct dsp {
+	void *priv;
+	double samplerate;
+
+	/* tone generation */
+	mf_mod_t *mf_mod;		/* MF modulator */
+	char tone;			/* current digit playing or 0 */
+	uint32_t tone_mask;		/* bit-mask of which MF tones to play */
+	int tone_duration;		/* counter of samples for length of tone */
+	char dial_string[33];		/* stores digits when dialing number sequence */
+	int dial_length;		/* length of dial string, or 0 */
+	int dial_index;			/* current position at dial string */
+	int digit_pause;		/* flag that states if pause is played after digit */
+
+	/* tone detection */
+	mf_demod_t *mf_demod;		/* MF demodulator */
+	double ms_per_sample;		/* how many milliseconds between two samples */
+	double detect_interval;		/* counts milliseconds */
+	int interrupt_duration;		/* number of milliseconds until interruption is detected */
+	int interrupt_count;		/* counter for interrupt condition */
+	int split_duration;		/* number of milliseconds until split (mute) condition meats */
+	int split_count;		/* counter for split condition */
+	int sig_detect_duration_AB;	/* signaling tone duration in milliseconds (TONE A/B) */
+	int sig_detect_duration_C;	/* signaling tone duration in milliseconds (TONE C) */
+	int mf_detect_duration;		/* MF tone duration in milliseconds */
+	int detect_count;		/* counter for tone detection */
+	char detect_tone;		/* current tone detected or ' ' for no tone */
+} dsp_t;
+
+
+int dsp_init_inst(dsp_t *dsp, void *priv, double samplerate, double sense_db);
+void dsp_cleanup_inst(dsp_t *dsp);
+void set_sig_detect_duration(dsp_t *dsp, double duration_AB, double duration_C);
+void set_tone(dsp_t *dsp, char tone, double duration);
+void set_dial_string(dsp_t *dsp, const char *dial);
+void audio_clock(struct ss5_endpoint *ss5_ep_sunset, struct ss5_endpoint *ss5_ep_sunrise, int len);
+void down_audio(struct osmo_cc_session_codec *codec, uint16_t __attribute__((unused)) sequence_number, uint32_t __attribute__((unused)) timestamp, uint8_t *data, int len);
+void encode_l16(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void decode_l16(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+
+void receive_digit(void *priv, char digit, double dbm);
+void dialing_complete(void *priv);
+