Merge pull request #1 from mirkobrankovic/videoroom-audiolevel-event

Videoroom audiolevel event

rtp.c

@@ -158,6 +158,19 @@ int janus_rtp_header_extension_parse_audio_level(char *buf, int len, int id, int
 	return 0;
 }
 
+int janus_rtp_header_extension_parse_audio_level_and_return(char *buf, int len, int id, int *level) {
+	uint8_t byte = 0;
+	if(janus_rtp_header_extension_find(buf, len, id, &byte, NULL) < 0)
+		return 0;
+	/* a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level */
+	// int v = (byte & 0x80) >> 7;
+	int value = byte & 0x7F;
+	// JANUS_LOG(LOG_DBG, "%02x --> v=%d, level=%d\n", byte, v, value);
+	if(level)
+		*level = value;
+	return value;
+}
+
 int janus_rtp_header_extension_parse_video_orientation(char *buf, int len, int id,
 		gboolean *c, gboolean *f, gboolean *r1, gboolean *r0) {
 	uint8_t byte = 0;

rtp.h

@@ -107,6 +107,14 @@ const char *janus_rtp_header_extension_get_from_id(const char *sdp, int id);
  * @returns 0 if found, -1 otherwise */
 int janus_rtp_header_extension_parse_audio_level(char *buf, int len, int id, int *level);
 
+/*! \brief Helper to parse a ssrc-audio-level RTP extension (https://tools.ietf.org/html/rfc6464)
+ * @param[in] buf The packet data
+ * @param[in] len The packet data length in bytes
+ * @param[in] id The extension ID to look for
+ * @param[out] level The level value in dBov (0=max, 127=min)
+ * @returns dBov level of audio, 0 otherwise */
+int janus_rtp_header_extension_parse_audio_level_and_return(char *buf, int len, int id, int *level);
+
 /*! \brief Helper to parse a video-orientation RTP extension (http://www.3gpp.org/ftp/Specs/html-info/26114.htm)
  * @param[in] buf The packet data
  * @param[in] len The packet data length in bytes