Start the ATIS recorded message at a random position into the broadcast when the...

diff --git a/src/ATC/ATCVoice.cxx b/src/ATC/ATCVoice.cxx
index 1b7aee42081cf697ba747c842c3dea1b383d1847..c319bb4925b597b1888a45daf0a67e0b82a9aa43 100644 (file)
--- a/src/ATC/ATCVoice.cxx
+++ b/src/ATC/ATCVoice.cxx
@@ -28,6 +28,7 @@
 #include <simgear/misc/sg_path.hxx>
 #include <simgear/debug/logstream.hxx>
 #include <simgear/misc/sgstream.hxx>
+#include <simgear/math/sg_random.h>
 #include <Main/globals.hxx>
 
 #include "ATCVoice.hxx"
@@ -143,7 +144,8 @@ unsigned char* FGATCVoice::WriteMessage(char* message, int& len, bool& dataOK) {
                dataOK = false;
                return(NULL);
        }
-       
+
+       unsigned char* tmpbuf = new unsigned char[cumLength];   
        unsigned char* outbuf = new unsigned char[cumLength];
        len = cumLength;
        unsigned int bufpos = 0;
@@ -162,10 +164,17 @@ unsigned char* FGATCVoice::WriteMessage(char* message, int& len, bool& dataOK) {
                        dataOK = false;
                        return(NULL);
                }
-               memcpy(outbuf + bufpos, rawSoundData + wdptr[i].offset, wdptr[i].length);
+               memcpy(tmpbuf + bufpos, rawSoundData + wdptr[i].offset, wdptr[i].length);
                bufpos += wdptr[i].length;
        }
        
+       // tmpbuf now contains the message starting at the beginning - but we want it to start at a random position.
+       unsigned int offsetIn = (int)(cumLength * sg_random());
+       if(offsetIn > cumLength) offsetIn = cumLength;
+       memcpy(outbuf, tmpbuf + offsetIn, (cumLength - offsetIn));
+       memcpy(outbuf + (cumLength - offsetIn), tmpbuf, offsetIn);
+       
+       delete[] tmpbuf;
        delete[] wdptr;
 
        dataOK = true;