1 files changed, 25 insertions, 0 deletions
diff --git a/include/dtmf_scheduler.h b/include/dtmf_scheduler.h
new file mode 100644
index 0000000..22a4e55
--- /dev/null
+++ b/include/dtmf_scheduler.h
@@ -0,0 +1,25 @@
+#ifndef DTMF_SCHEDULER_H
+#define DTMF_SCHEDULER_H
+
+/**
+ * The state/queue for DTMF signalling.
+ */
+struct dtmf_state {
+	int size;		/* <! The last tone to play */
+	char tones[24];		/* <! Pending tones */
+	int playing;		/* <! Playing a tone right now? */
+};
+
+/* initialize */
+void dtmf_state_init(struct dtmf_state *state);
+
+/* add a tone to the list */
+int dtmf_state_add(struct dtmf_state *state, char tone);
+
+/* tones that should be played, playing will be set to 1 */
+void dtmf_state_get_pending(struct dtmf_state *state, char *tones);
+
+/* call when the playout is done */
+void dtmf_state_played(struct dtmf_state *state);
+
+#endif