Add ability to specify custom payload type

include/media_stream.hh

@@ -121,6 +121,9 @@ namespace uvg_rtp {
             void  set_media_config(void *config);
             void *get_media_config();
 
+            /* Overwrite the payload type set during initialization */
+            void set_dynamic_payload(uint8_t payload);
+
             /* Get unique key of the media stream
              * Used by session to index media streams */
             uint32_t get_key();

include/rtp.hh

@@ -19,6 +19,7 @@ namespace uvg_rtp {
 
             void set_clock_rate(size_t rate);
             void set_payload(rtp_format_t fmt);
+            void set_dynamic_payload(uint8_t payload);
 
             void fill_header(uint8_t *buffer);
             void update_sequence(uint8_t *buffer);
@@ -28,6 +29,7 @@ namespace uvg_rtp {
             uint32_t ts_;
             uint16_t seq_;
             uint8_t fmt_;
+            uint8_t payload_;
 
             uint32_t clock_rate_;
             uint32_t wc_start_;

src/media_stream.cc

@@ -221,3 +221,8 @@ uint32_t uvg_rtp::media_stream::get_key()
 {
     return key_;
 }
+
+void uvg_rtp::media_stream::set_dynamic_payload(uint8_t payload)
+{
+    rtp_->set_dynamic_payload(payload);
+}

src/rtp.cc

@@ -36,7 +36,7 @@ uint16_t uvg_rtp::rtp::get_sequence()
 
 void uvg_rtp::rtp::set_payload(rtp_format_t fmt)
 {
-    fmt_ = fmt;
+    payload_ = fmt_ = fmt;
 
     switch (fmt_) {
         case RTP_FORMAT_HEVC:
@@ -54,6 +54,11 @@ void uvg_rtp::rtp::set_payload(rtp_format_t fmt)
     }
 }
 
+void uvg_rtp::rtp::set_dynamic_payload(uint8_t payload)
+{
+    payload_ = payload;
+}
+
 void uvg_rtp::rtp::inc_sequence()
 {
     seq_++;
@@ -86,7 +91,7 @@ void uvg_rtp::rtp::fill_header(uint8_t *buffer)
     }
 
     buffer[0] = 2 << 6; // RTP version
-    buffer[1] = (fmt_ & 0x7f) | (0 << 7);
+    buffer[1] = (payload_ & 0x7f) | (0 << 7);
 
     *(uint16_t *)&buffer[2] = htons(seq_);
     *(uint32_t *)&buffer[4] = htonl(