put toxav.h stuff in toxav.api.h

toxav/toxav.api.h

@@ -655,6 +655,14 @@ int toxav_group_send_audio(Tox *tox, uint32_t groupnumber, const int16_t *pcm, u
                            uint32_t sample_rate);
 
 /* Enable A/V in a groupchat.
+ *
+ * A/V must be enabled on a groupchat for audio to be sent to it and for
+ * received audio to be handled.
+ *
+ * An A/V group created with toxav_add_av_groupchat or toxav_join_av_groupchat
+ * will start with A/V enabled.
+ *
+ * An A/V group loaded from a savefile will start with A/V disabled.
  *
  * return 0 on success.
  * return -1 on failure.
@@ -675,6 +683,10 @@ int toxav_groupchat_enable_av(Tox *tox, uint32_t groupnumber,
  */
 int toxav_groupchat_disable_av(Tox *tox, uint32_t groupnumber);
 
+/* Return whether A/V is enabled in the groupchat.
+ */
+bool toxav_groupchat_av_enabled(Tox *tox, uint32_t groupnumber);
+
 #ifdef __cplusplus
 }
 #endif