fix ps to h264 frame_size < 0 checkt

trunk/src/app/srs_app_gb28181.cpp

@@ -1310,6 +1310,14 @@ srs_error_t SrsGb28181RtmpMuxer::write_h264_ipb_frame2(char *frame, int frame_si
 {
     srs_error_t err = srs_success;
 
+    if (!frame){
+        return srs_error_new(ERROR_GB28181_H264_FRAME_FULL, "h264 frame null");
+    }
+
+    if (frame_size <= 0){
+        return srs_error_new(ERROR_GB28181_H264_FRAMESIZE, "h264 frame size");
+    }
+
     SrsAvcNaluType nal_unit_type = (SrsAvcNaluType)(frame[0] & 0x1f);
     // ignore the nalu type sei(6) aud(9) 
     if (nal_unit_type == SrsAvcNaluTypeAccessUnitDelimiter ||

trunk/src/kernel/srs_kernel_error.hpp

@@ -375,6 +375,8 @@
 #define ERROR_GB28181_SIP_PTZ_FAILED        6016
 #define ERROR_GB28181_SIP_NOT_INVITE        6017
 #define ERROR_GB28181_SIP_PTZ_CMD_INVALID   6018
+#define ERROR_GB28181_H264_FRAMESIZE        6019
+#define ERROR_GB28181_H264_FRAME_FULL       6020
 
 ///////////////////////////////////////////////////////
 // HTTP API error.