@@ -10,17 +10,20 @@ include(FindPythonLibs)
 list(APPEND DEPENDENCY_LIB ${PYTHON_LIBRARIES})
 include_directories(AFTER ${PYTHON_INCLUDE_DIRS})
 
+file(GLOB PYTHON_HEADERS ${CMAKE_CURRENT_SOURCE_DIR}/*.h)
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/setup.py.in ${CMAKE_CURRENT_BINARY_DIR}/setup.py)
 add_custom_command(OUTPUT build/lib/${BINARY_NAME}/__init__.py
                    COMMAND BINDIR=${CMAKE_CURRENT_BINARY_DIR}/.. CPPFLAGS="${INCLUDE_FLAGS}" ${PYTHON} ${CMAKE_CURRENT_BINARY_DIR}/setup.py build --build-base ${CMAKE_CURRENT_BINARY_DIR}
                    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
                    DEPENDS ${BINARY_NAME}
                    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/setup.py
+                   DEPENDS ${PYTHON_HEADERS}
                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/_builder.py)
 
 add_custom_command(OUTPUT lib.c
                   COMMAND BINDIR=${CMAKE_CURRENT_BINARY_DIR}/.. CPPFLAGS="${INCLUDE_FLAGS}" ${PYTHON} ${CMAKE_CURRENT_SOURCE_DIR}/_builder.py
-                  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/lib.h
+                  DEPENDS ${PYTHON_HEADERS}
                   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/_builder.py)
 
 set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/lib.c PROPERTIES GENERATED ON)

@@ -35,6 +35,7 @@ #include <mgba/core/thread.h>
 #include <mgba/core/version.h>
 
 #define PYEXPORT extern "Python+C"
+#include "platform/python/core.h"
 #include "platform/python/log.h"
 #include "platform/python/sio.h"
 #include "platform/python/vfs-py.h"

@@ -38,6 +38,7 @@ #include <mgba-util/png-io.h>
 #include <mgba-util/vfs.h>
 
 #define PYEXPORT
+#include "platform/python/core.h"
 #include "platform/python/log.h"
 #include "platform/python/sio.h"
 #include "platform/python/vfs-py.h"
@@ -46,7 +47,7 @@ """, include_dirs=[incdir, srcdir],
      extra_compile_args=cppflags,
      libraries=["mgba"],
      library_dirs=[bindir],
-     sources=[os.path.join(pydir, path) for path in ["vfs-py.c", "log.c", "sio.c"]])
+     sources=[os.path.join(pydir, path) for path in ["vfs-py.c", "core.c", "log.c", "sio.c"]])
 
 preprocessed = subprocess.check_output(cpp + ["-fno-inline", "-P"] + cppflags + [os.path.join(pydir, "_builder.h")], universal_newlines=True)
 

@@ -0,0 +1,19 @@
+/* Copyright (c) 2013-2016 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "core.h"
+
+#include <mgba/core/core.h>
+
+struct mCoreCallbacks* mCorePythonCallbackCreate(void* pyobj) {
+	struct mCoreCallbacks* callbacks = malloc(sizeof(*callbacks));
+	callbacks->videoFrameStarted = _mCorePythonCallbacksVideoFrameStarted;
+	callbacks->videoFrameEnded = _mCorePythonCallbacksVideoFrameEnded;
+	callbacks->coreCrashed = _mCorePythonCallbacksCoreCrashed;
+	callbacks->sleep = _mCorePythonCallbacksSleep;
+
+	callbacks->context = pyobj;
+	return callbacks;
+}

@@ -0,0 +1,15 @@
+/* Copyright (c) 2013-2017 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include <mgba-util/common.h>
+
+#include "pycommon.h"
+
+struct mCoreCallbacks* mCorePythonCallbackCreate(void* pyobj);
+
+PYEXPORT void _mCorePythonCallbacksVideoFrameStarted(void* user);
+PYEXPORT void _mCorePythonCallbacksVideoFrameEnded(void* user);
+PYEXPORT void _mCorePythonCallbacksCoreCrashed(void* user);
+PYEXPORT void _mCorePythonCallbacksSleep(void* user);

@@ -3,14 +3,7 @@ *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#include <mgba/core/log.h>
-
-struct mLoggerPy {
-    struct mLogger d;
-    void* pyobj;
-};
-
-void _pyLog(void* logger, int category, enum mLogLevel level, const char* message);
+#include "log.h"
 
 static void _pyLogShim(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args) {
 	struct mLoggerPy* pylogger = (struct mLoggerPy*) logger;

@@ -5,6 +5,8 @@ * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <mgba/core/log.h>
 
+#include "pycommon.h"
+
 struct mLoggerPy {
     struct mLogger d;
     void* pyobj;

@@ -4,7 +4,7 @@ # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 from ._pylib import ffi, lib
-from . import tile
+from . import tile, createCallback
 from cached_property import cached_property
 
 def find(path):
@@ -45,11 +45,58 @@ raise RuntimeError("Core is protected")
         return f(self, *args, **kwargs)
     return wrapper
 
+@ffi.def_extern()
+def _mCorePythonCallbacksVideoFrameStarted(user):
+    context = ffi.from_handle(user)
+    context._videoFrameStarted()
+
+@ffi.def_extern()
+def _mCorePythonCallbacksVideoFrameEnded(user):
+    context = ffi.from_handle(user)
+    context._videoFrameEnded()
+
+@ffi.def_extern()
+def _mCorePythonCallbacksCoreCrashed(user):
+    context = ffi.from_handle(user)
+    context._coreCrashed()
+
+@ffi.def_extern()
+def _mCorePythonCallbacksSleep(user):
+    context = ffi.from_handle(user)
+    context._sleep()
+
+class CoreCallbacks(object):
+    def __init__(self):
+        self._handle = ffi.new_handle(self)
+        self.videoFrameStarted = []
+        self.videoFrameEnded = []
+        self.coreCrashed = []
+        self.sleep = []
+        self.context = lib.mCorePythonCallbackCreate(self._handle)
+
+    def _videoFrameStarted(self):
+        for cb in self.videoFrameStarted:
+            cb()
+
+    def _videoFrameEnded(self):
+        for cb in self.videoFrameEnded:
+            cb()
+
+    def _coreCrashed(self):
+        for cb in self.coreCrashed:
+            cb()
+
+    def _sleep(self):
+        for cb in self.sleep:
+            cb()
+
 class Core(object):
     def __init__(self, native):
         self._core = native
         self._wasReset = False
         self._protected = False
+        self._callbacks = CoreCallbacks()
+        self._core.addCoreCallbacks(self._core, self._callbacks.context)
 
     @cached_property
     def tiles(self):
@@ -150,25 +197,33 @@
     def clearKeys(self, *args, **kwargs):
         self._core.clearKeys(self._core, self._keysToInt(*args, **kwargs))
 
+    @property
     @needsReset
     def frameCounter(self):
         return self._core.frameCounter(self._core)
 
+    @property
     def frameCycles(self):
         return self._core.frameCycles(self._core)
 
+    @property
     def frequency(self):
         return self._core.frequency(self._core)
 
-    def getGameTitle(self):
+    @property
+    def gameTitle(self):
         title = ffi.new("char[16]")
         self._core.getGameTitle(self._core, title)
         return ffi.string(title, 16).decode("ascii")
 
-    def getGameCode(self):
+    @property
+    def gameCode(self):
         code = ffi.new("char[12]")
         self._core.getGameCode(self._core, code)
         return ffi.string(code, 12).decode("ascii")
+
+    def addFrameCallback(self, cb):
+        self._callbacks.videoFrameEnded.append(cb)
 
 class ICoreOwner(object):
     def claim(self):

@@ -0,0 +1,15 @@
+/* Copyright (c) 2013-2017 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef PYTHON_COMMON_H
+#define PYTHON_COMMON_H
+
+#include <mgba-util/common.h>
+
+#ifndef PYEXPORT
+#define PYEXPORT extern
+#endif
+
+#endif

@@ -3,22 +3,7 @@ *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#include <mgba-util/vfs.h>
-
-struct VFilePy {
-	struct VFile d;
-	void* fileobj;
-};
-
-bool _vfpClose(struct VFile* vf);
-off_t _vfpSeek(struct VFile* vf, off_t offset, int whence);
-ssize_t _vfpRead(struct VFile* vf, void* buffer, size_t size);
-ssize_t _vfpWrite(struct VFile* vf, const void* buffer, size_t size);
-void* _vfpMap(struct VFile* vf, size_t size, int flags);
-void _vfpUnmap(struct VFile* vf, void* memory, size_t size);
-void _vfpTruncate(struct VFile* vf, size_t size);
-ssize_t _vfpSize(struct VFile* vf);
-bool _vfpSync(struct VFile* vf, const void* buffer, size_t size);
+#include "vfs-py.h"
 
 struct VFile* VFileFromPython(void* fileobj) {
 	if (!fileobj) {

@@ -3,8 +3,9 @@ *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include <mgba-util/vfs.h>
 
-#include <mgba-util/vfs.h>
+#include "pycommon.h"
 
 struct VFilePy {
 	struct VFile d;