ffplay: log SDL error messages

This logs the SDL error messages on failure of creation of SDL_CreateMutex,
SDL_CreateCond, and SDL_CreateThread.
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

ffplay.c

@@ -657,10 +657,14 @@ static int frame_queue_init(FrameQueue *f, PacketQueue *pktq, int max_size, int
 {
     int i;
     memset(f, 0, sizeof(FrameQueue));
-    if (!(f->mutex = SDL_CreateMutex()))
+    if (!(f->mutex = SDL_CreateMutex())) {
+        av_log(NULL, AV_LOG_FATAL, "SDL_CreateMutex(): %s\n", SDL_GetError());
         return AVERROR(ENOMEM);
-    if (!(f->cond = SDL_CreateCond()))
+    }
+    if (!(f->cond = SDL_CreateCond())) {
+        av_log(NULL, AV_LOG_FATAL, "SDL_CreateCond(): %s\n", SDL_GetError());
         return AVERROR(ENOMEM);
+    }
     f->pktq = pktq;
     f->max_size = FFMIN(max_size, FRAME_QUEUE_SIZE);
     f->keep_last = !!keep_last;
@@ -3175,6 +3179,7 @@ static VideoState *stream_open(const char *filename, AVInputFormat *iformat)
     is->av_sync_type = av_sync_type;
     is->read_tid     = SDL_CreateThread(read_thread, is);
     if (!is->read_tid) {
+        av_log(NULL, AV_LOG_FATAL, "SDL_CreateThread(): %s\n", SDL_GetError());
 fail:
         stream_close(is);
         return NULL;
@@ -3726,8 +3731,10 @@ static int lockmgr(void **mtx, enum AVLockOp op)
    switch(op) {
       case AV_LOCK_CREATE:
           *mtx = SDL_CreateMutex();
-          if(!*mtx)
+          if(!*mtx) {
+              av_log(NULL, AV_LOG_FATAL, "SDL_CreateMutex(): %s\n", SDL_GetError());
               return 1;
+          }
           return 0;
       case AV_LOCK_OBTAIN:
           return !!SDL_LockMutex(*mtx);