Refactoring: Use enum for RtpPayloadType.

media/cast/test/receiver.cc

Index: media/cast/test/receiver.cc
diff --git a/media/cast/test/receiver.cc b/media/cast/test/receiver.cc
index b2e59bd20d8afd6ee4ccd15f69012c08a451e2a3..04739b2ed88fe391b46335ea41dc31c887c65b92 100644
--- a/media/cast/test/receiver.cc
+++ b/media/cast/test/receiver.cc
@@ -59,10 +59,8 @@ namespace cast {
 #define DEFAULT_SEND_IP "0.0.0.0"
 #define DEFAULT_AUDIO_FEEDBACK_SSRC "2"
 #define DEFAULT_AUDIO_INCOMING_SSRC "1"
-#define DEFAULT_AUDIO_PAYLOAD_TYPE "127"
 #define DEFAULT_VIDEO_FEEDBACK_SSRC "12"
 #define DEFAULT_VIDEO_INCOMING_SSRC "11"
-#define DEFAULT_VIDEO_PAYLOAD_TYPE "96"
 
 #if defined(USE_X11)
 const char* kVideoWindowWidth = "1280";
@@ -125,10 +123,11 @@ void GetWindowSize(int* width, int* height) {
 
 void GetAudioPayloadtype(FrameReceiverConfig* audio_config) {
   test::InputBuilder input("Choose audio receiver payload type.",
-                           DEFAULT_AUDIO_PAYLOAD_TYPE,
-                           kDefaultRtpVideoPayloadType  /* low_range */,
-                           kDefaultRtpAudioPayloadType  /* high_range */);
-  audio_config->rtp_payload_type = input.GetIntInput();
+                           std::to_string(RTP_PAYLOAD_AUDIO_OPUS),
+                           RTP_PAYLOAD_AUDIO_OPUS /* low_range */,
+                           RTP_PAYLOAD_AUDIO_LAST /* high_range */);
+  audio_config->rtp_payload_type =
+      static_cast<RtpPayloadType>(input.GetIntInput());
 }
 
 FrameReceiverConfig GetAudioReceiverConfig() {
@@ -141,10 +140,11 @@ FrameReceiverConfig GetAudioReceiverConfig() {
 
 void GetVideoPayloadtype(FrameReceiverConfig* video_config) {
   test::InputBuilder input("Choose video receiver payload type.",
-                           DEFAULT_VIDEO_PAYLOAD_TYPE,
-                           kDefaultRtpVideoPayloadType  /* low_range */,
-                           kDefaultRtpAudioPayloadType  /* high_range */);
-  video_config->rtp_payload_type = input.GetIntInput();
+                           std::to_string(RTP_PAYLOAD_VIDEO_VP8),
+                           RTP_PAYLOAD_VIDEO_VP8 /* low_range */,
+                           RTP_PAYLOAD_VIDEO_LAST /* high_range */);
+  video_config->rtp_payload_type =
+      static_cast<RtpPayloadType>(input.GetIntInput());
 }
 
 FrameReceiverConfig GetVideoReceiverConfig() {