wineoss.drv: Don't skip over position updates of less than one fragment.

dlls/wineoss.drv/mmdevdrv.c

@@ -1393,7 +1393,7 @@ static void oss_write_data(ACImpl *This)
 {
     ssize_t written_bytes;
     UINT32 written_frames, in_oss_frames, write_limit, max_period, write_offs_frames, new_frames;
-    size_t to_write_frames, to_write_bytes, advanced;
+    SIZE_T to_write_frames, to_write_bytes, advanced;
     audio_buf_info bi;
     BYTE *buf;
 
@@ -1409,9 +1409,7 @@ static void oss_write_data(ACImpl *This)
                 bi.bytes, This->oss_bufsize_bytes);
         This->oss_bufsize_bytes = bi.bytes;
         in_oss_frames = 0;
-    }else if(This->oss_bufsize_bytes - bi.bytes <= bi.fragsize)
-        in_oss_frames = 0;
-    else
+    }else
         in_oss_frames = (This->oss_bufsize_bytes - bi.bytes) / This->fmt->nBlockAlign;
 
     write_limit = 0;
@@ -1433,6 +1431,8 @@ static void oss_write_data(ACImpl *This)
     This->lcl_offs_frames %= This->bufsize_frames;
     This->held_frames -= advanced;
     This->in_oss_frames = in_oss_frames;
+    TRACE("advanced by %lu, lcl_offs: %u, held: %u, in_oss: %u\n",
+            advanced, This->lcl_offs_frames, This->held_frames, This->in_oss_frames);
 
 
     if(This->held_frames == This->in_oss_frames)
@@ -1448,7 +1448,9 @@ static void oss_write_data(ACImpl *This)
 
     to_write_frames = min(to_write_frames, write_limit);
     to_write_bytes = to_write_frames * This->fmt->nBlockAlign;
-
+    TRACE("going to write %lu frames from %u (%lu of %u)\n", to_write_frames,
+            write_offs_frames, to_write_frames + write_offs_frames,
+            This->bufsize_frames);
 
     buf = This->local_buffer + write_offs_frames * This->fmt->nBlockAlign;
 
@@ -1479,6 +1481,8 @@ static void oss_write_data(ACImpl *This)
         if(This->session->mute)
             silence_buffer(This, This->local_buffer, to_write_frames);
 
+        TRACE("wrapping to write %lu frames from beginning\n", to_write_frames);
+
         written_bytes = write(This->fd, This->local_buffer, to_write_bytes);
         if(written_bytes < 0){
             WARN("write failed: %d (%s)\n", errno, strerror(errno));