merge from srs2.

trunk/src/app/srs_app_utility.cpp

@@ -29,6 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <arpa/inet.h>
 #include <signal.h>
 #include <sys/wait.h>
+#include <math.h>
 
 #ifdef SRS_OSX
 #include <sys/sysctl.h>
@@ -47,6 +48,7 @@ using namespace std;
 #include <srs_protocol_json.hpp>
 #include <srs_kernel_buffer.hpp>
 #include <srs_protocol_amf0.hpp>
+#include <srs_kernel_utility.hpp>
 
 // the longest time to wait for a process to quit.
 #define SRS_PROCESS_QUIT_TIMEOUT_MS 1000
@@ -1340,6 +1342,11 @@ string srs_get_peer_ip(int fd)
     return ip;
 }
 
+bool srs_string_is_http(string url)
+{
+    return srs_string_starts_with(url, "http://", "https://");
+}
+
 bool srs_is_digit_number(const string& str)
 {
     if (str.empty()) {