rtpdec: Change enc_name to a pointer instead of a fixed-size buffer

This avoids allocating space for a too large buffer for all the
name strings.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/rtpdec.c

@@ -113,7 +113,8 @@ RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
     RTPDynamicProtocolHandler *handler;
     for (handler = rtp_first_dynamic_payload_handler;
          handler; handler = handler->next)
-        if (!av_strcasecmp(name, handler->enc_name) &&
+        if (handler->enc_name &&
+            !av_strcasecmp(name, handler->enc_name) &&
             codec_type == handler->codec_type)
             return handler;
     return NULL;

libavformat/rtpdec.h

@@ -113,7 +113,7 @@ typedef int (*DynamicPayloadPacketHandlerProc)(AVFormatContext *ctx,
                                                int len, uint16_t seq, int flags);
 
 struct RTPDynamicProtocolHandler {
-    const char enc_name[50];
+    const char *enc_name;
     enum AVMediaType codec_type;
     enum AVCodecID codec_id;
     int static_payload_id; /* 0 means no payload id is set. 0 is a valid