ffmpeg: windows: respond to logoff and ctrl+break messages as well

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -1787,6 +1787,7 @@ SYSTEM_FUNCS="
     pthread_cancel
     sched_getaffinity
     SetConsoleTextAttribute
+    SetConsoleCtrlHandler
     setmode
     setrlimit
     Sleep
@@ -4990,6 +4991,7 @@ check_func_headers windows.h GetSystemTimeAsFileTime
 check_func_headers windows.h MapViewOfFile
 check_func_headers windows.h PeekNamedPipe
 check_func_headers windows.h SetConsoleTextAttribute
+check_func_headers windows.h SetConsoleCtrlHandler
 check_func_headers windows.h Sleep
 check_func_headers windows.h VirtualAlloc
 check_struct windows.h "CONDITION_VARIABLE" Ptr

ffmpeg.c

@@ -79,6 +79,10 @@
 #include <windows.h>
 #include <psapi.h>
 #endif
+#if HAVE_SETCONSOLECTRLHANDLER
+#include <windows.h>
+#endif
+
 
 #if HAVE_SYS_SELECT_H
 #include <sys/select.h>
@@ -313,6 +317,7 @@ void term_exit(void)
 static volatile int received_sigterm = 0;
 static volatile int received_nb_signals = 0;
 static volatile int transcode_init_done = 0;
+static volatile int ffmpeg_exited = 0;
 static int main_return_code = 0;
 
 static void
@@ -329,6 +334,38 @@ sigterm_handler(int sig)
     }
 }
 
+#if HAVE_SETCONSOLECTRLHANDLER
+static BOOL WINAPI CtrlHandler(DWORD fdwCtrlType)
+{
+    av_log(NULL, AV_LOG_DEBUG, "\nReceived windows signal %ld\n", fdwCtrlType);
+
+    switch (fdwCtrlType)
+    {
+    case CTRL_C_EVENT:
+    case CTRL_BREAK_EVENT:
+        sigterm_handler(SIGINT);
+        return TRUE;
+
+    case CTRL_CLOSE_EVENT:
+    case CTRL_LOGOFF_EVENT:
+    case CTRL_SHUTDOWN_EVENT:
+        sigterm_handler(SIGTERM);
+        /* Basically, with these 3 events, when we return from this method the
+           process is hard terminated, so stall as long as we need to
+           to try and let the main thread(s) clean up and gracefully terminate
+           (we have at most 5 seconds, but should be done far before that). */
+        while (!ffmpeg_exited) {
+            Sleep(0);
+        }
+        return TRUE;
+
+    default:
+        av_log(NULL, AV_LOG_ERROR, "Received unknown windows signal %ld\n", fdwCtrlType);
+        return FALSE;
+    }
+}
+#endif
+
 void term_init(void)
 {
 #if HAVE_TERMIOS_H
@@ -362,6 +399,9 @@ void term_init(void)
 #ifdef SIGXCPU
     signal(SIGXCPU, sigterm_handler);
 #endif
+#if HAVE_SETCONSOLECTRLHANDLER
+    SetConsoleCtrlHandler((PHANDLER_ROUTINE) CtrlHandler, TRUE);
+#endif
 }
 
 /* read a key without blocking */
@@ -537,6 +577,7 @@ static void ffmpeg_cleanup(int ret)
         av_log(NULL, AV_LOG_INFO, "Conversion failed!\n");
     }
     term_exit();
+    ffmpeg_exited = 1;
 }
 
 void remove_avoptions(AVDictionary **a, AVDictionary *b)