for bug #199, refine the header generate

@@ -600,13 +600,15 @@ void SrsProtocol::generate_chunk_header(SrsMessageHeader* mh, bool c0, int* pnbh
     // generate the header.
     char* p = cache;
     
+    // timestamp for c0/c3
+    u_int32_t timestamp = (u_int32_t)mh->timestamp;
+    
     if (c0) {
         // write new chunk stream header, fmt is 0
         *p++ = 0x00 | (mh->perfer_cid & 0x3F);
         
         // chunk message header, 11 bytes
         // timestamp, 3bytes, big-endian
-        u_int32_t timestamp = (u_int32_t)mh->timestamp;
         if (timestamp < RTMP_EXTENDED_TIMESTAMP) {
             pp = (char*)&timestamp;
             *p++ = pp[2];
@@ -633,21 +635,17 @@ void SrsProtocol::generate_chunk_header(SrsMessageHeader* mh, bool c0, int* pnbh
         *p++ = pp[1];
         *p++ = pp[2];
         *p++ = pp[3];
-        
-        // chunk extended timestamp header, 0 or 4 bytes, big-endian
-        if(timestamp >= RTMP_EXTENDED_TIMESTAMP) {
-            pp = (char*)&timestamp;
-            *p++ = pp[3];
-            *p++ = pp[2];
-            *p++ = pp[1];
-            *p++ = pp[0];
-        }
     } else {
         // write no message header chunk stream, fmt is 3
         // @remark, if perfer_cid > 0x3F, that is, use 2B/3B chunk header,
         // SRS will rollback to 1B chunk header.
         *p++ = 0xC0 | (mh->perfer_cid & 0x3F);
+    }
     
+    // for c0
+    // chunk extended timestamp header, 0 or 4 bytes, big-endian
+    // 
+    // for c3:
     // chunk extended timestamp header, 0 or 4 bytes, big-endian
     // 6.1.3. Extended Timestamp
     // This field is transmitted only when the normal time stamp in the
@@ -662,7 +660,6 @@ void SrsProtocol::generate_chunk_header(SrsMessageHeader* mh, bool c0, int* pnbh
     // @see: ngx_rtmp_prepare_message
     // @see: http://blog.csdn.net/win_lin/article/details/13363699
     // TODO: FIXME: extract to outer.
-        u_int32_t timestamp = (u_int32_t)mh->timestamp;
     if (timestamp >= RTMP_EXTENDED_TIMESTAMP) {
         pp = (char*)&timestamp;
         *p++ = pp[3];
@@ -670,7 +667,6 @@ void SrsProtocol::generate_chunk_header(SrsMessageHeader* mh, bool c0, int* pnbh
         *p++ = pp[1];
         *p++ = pp[0];
     }
-    }
     
     // always has header
     *pnbh = p - cache;