+/**
+ * Wildcard value used by #linphone_core_find_payload_type to ignore rate in search algirithm
+ * @ingroup media_parameters
+ */
+#define LINPHONE_FIND_PAYLOAD_IGNORE_RATE -1
+/**
+ * Wildcard value used by #linphone_core_find_payload_type to ignore channel in search algirithm
+ * @ingroup media_parameters
+ */
+#define LINPHONE_FIND_PAYLOAD_IGNORE_CHANNELS -1
+/**
+ * Get payload type from mime type and clock rate
+ * @ingroup media_parameters
+ * This function searches in audio and video codecs for the given payload type name and clockrate.
+ * @param lc #LinphoneCore object
+ * @param type payload mime type (I.E SPEEX, PCMU, VP8)
+ * @param rate, can be #LINPHONE_FIND_PAYLOAD_IGNORE_RATE
+ * @param channels, number of channels, can be #LINPHONE_FIND_PAYLOAD_IGNORE_CHANNELS
+ * @return Returns NULL if not found.
+ */