DCHECK that no RTPPayloadRegistry instance is used for both audio and video

webrtc/modules/rtp_rtcp/source/rtp_payload_registry.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_payload_registry.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_payload_registry.cc b/webrtc/modules/rtp_rtcp/source/rtp_payload_registry.cc
index 3d2aad42a0160170b3e6be6cfe55dc05834bb213..55d167879ba5e3cfff82fb704cc9a05e29b8a173 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_payload_registry.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_payload_registry.cc
@@ -121,6 +121,11 @@ RTPPayloadRegistry::~RTPPayloadRegistry() = default;
 
 int32_t RTPPayloadRegistry::RegisterReceivePayload(const CodecInst& audio_codec,
                                                    bool* created_new_payload) {
+#if RTC_DCHECK_IS_ON
+  RTC_DCHECK(!used_for_video_);
+  used_for_audio_ = true;
+#endif
+
   *created_new_payload = false;
   if (!IsPayloadTypeValid(audio_codec.pltype))
     return -1;
@@ -154,6 +159,11 @@ int32_t RTPPayloadRegistry::RegisterReceivePayload(const CodecInst& audio_codec,
 
 int32_t RTPPayloadRegistry::RegisterReceivePayload(
     const VideoCodec& video_codec) {
+#if RTC_DCHECK_IS_ON
+  RTC_DCHECK(!used_for_audio_);
+  used_for_video_ = true;
+#endif
+
   if (!IsPayloadTypeValid(video_codec.plType))
     return -1;