whatsnew

网络MPEG4IP流媒体开发源代码

	int Handle_AltEnter(const SDL_Event *event)
	{
	    if ( event->type == SDL_KEYDOWN ) {
	        if ( (event->key.keysym.sym == SDLK_RETURN) &&
	             (event->key.keysym.mod & KMOD_ALT) ) {   
	                SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
	                return(0);
	        }
	    }
	    return(1);
	}
	SDL_SetEventFilter(Handle_AltEnter);

1.0.3:
	Under X11, if you grab the input and hide the mouse cursor,
	the mouse will go into a "relative motion" mode where you
	will always get relative motion events no matter how far in
	each direction you move the mouse - relative motion is not
	bounded by the edges of the window (though the absolute values
	of the mouse positions are clamped by the size of the window).
	The SVGAlib, framebuffer console, and DirectInput drivers all
	have this behavior naturally, and the GDI and BWindow drivers
	never go into "relative motion" mode.

1.0.2:
	Added a function to enable keyboard repeat:
		SDL_EnableKeyRepeat()

	Added a function to grab the mouse and keyboard input
		SDL_WM_GrabInput()

	Added a function to iconify the window.
		SDL_WM_IconifyWindow()
	If this function succeeds, the application will receive an event
	signaling SDL_APPACTIVE event 

1.0.1:
	Added constants to SDL_audio.h for 16-bit native byte ordering:
		AUDIO_U16SYS, AUDIO_S16SYS

1.0.0:
	New public release

Version 0.11:

0.11.5:
	A new function SDL_GetVideoSurface() has been added, and returns
	a pointer to the current display surface.

	SDL_AllocSurface() has been renamed SDL_CreateRGBSurface(), and
	a new function SDL_CreateRGBSurfaceFrom() has been added to allow
	creating an SDL surface from an existing pixel data buffer.

	Added SDL_GetRGB() to the headers and documentation.

0.11.4:
	SDL_SetLibraryPath() is no longer meaningful, and has been removed.

0.11.3:
	A new flag for SDL_Init(), SDL_INIT_NOPARACHUTE, prevents SDL from
	installing fatal signal handlers on operating systems that support
	them.

Version 0.9:

0.9.15:
	SDL_CreateColorCursor() has been removed.  Color cursors should
	be implemented as sprites, blitted by the application when the
	cursor moves.  To get smooth color cursor updates when the app
	is busy, pass the SDL_INIT_EVENTTHREAD flag to SDL_Init().  This
	allows you to handle the mouse motion in another thread from an
	event filter function, but is currently only supported by Linux
	and BeOS.  Note that you'll have to protect the display surface
	from multi-threaded access by using mutexes if you do this.

	Thread-safe surface support has been removed from SDL.
	This makes blitting somewhat faster, by removing SDL_MiddleBlit().
	Code that used SDL_MiddleBlit() should use SDL_LowerBlit() instead.
	You can make your surfaces thread-safe by allocating your own
	mutex and making lock/unlock calls around accesses to your surface.

0.9.14:
	SDL_GetMouseState() now takes pointers to int rather than Uint16.

	If you set the SDL_WINDOWID environment variable under UNIX X11,
	SDL will use that as the main window instead of creating it's own.
	This is an unsupported extension to SDL, and not portable at all.

0.9.13:
	Added a function SDL_SetLibraryPath() which can be used to specify
	the directory containing the SDL dynamic libraries.  This is useful
	for commercial applications which ship with particular versions
	of the libraries, and for security on multi-user systems.
	If this function is not used, the default system directories are 
	searched using the native dynamic object loading mechanism.

	In order to support C linkage under Visual C++, you must declare
	main() without any return type:
		main(int argc, char *argv[]) {
			/* Do the program... */
			return(0);
		}
	C++ programs should also return a value if compiled under VC++.

	The blit_endian member of the SDL_VideoInfo struct has been removed.

	SDL_SymToASCII() has been replaced with SDL_GetKeyName(), so there
	is now no longer any function to translate a keysym to a character.

	The SDL_keysym structure has been extended with a 'scancode' and
	'unicode' member.  The 'scancode' is a hardware specific scancode
	for the key that was pressed, and may be 0.  The 'unicode' member
	is a 16-bit UNICODE translation of the key that was pressed along
	with any modifiers or compose keys that have been pressed.
	If no UNICODE translation exists for the key, 'unicode' will be 0.

	Added a function SDL_EnableUNICODE() to enable/disable UNICODE
	translation of character keypresses.  Translation defaults off.

	To convert existing code to use the new API, change code which
	uses SDL_SymToASCII() to get the keyname to use SDL_GetKeyName(),
	and change code which uses it to get the ASCII value of a sym to
	use the 'unicode' member of the event keysym.

0.9.12:
	There is partial support for 64-bit datatypes.  I don't recommend 
	you use this if you have a choice, because 64-bit datatypes are not
	supported on many platforms.  On platforms for which it is supported,
	the SDL_HAS_64BIT_TYPE C preprocessor define will be enabled, and
	you can use the Uint64 and Sint64 datatypes.

	Added functions to SDL_endian.h to support 64-bit datatypes:
	    SDL_SwapLE64(), SDL_SwapBE64(),
	    SDL_ReadLE64(), SDL_ReadBE64(), SDL_WriteLE64(), SDL_WriteBE64()

	A new member "len_ratio" has been added to the SDL_AudioCVT structure,
	and allows you to determine either the original buffer length or the
	converted buffer length, given the other.

	A new function SDL_FreeWAV() has been added to the API to free data
	allocated by SDL_LoadWAV_RW().  This is necessary under Win32 since
	the gcc compiled DLL uses a different heap than VC++ compiled apps.

	SDL now has initial support for international keyboards using the
	Latin character set.
	If a particular mapping is desired, you can set the DEFAULT_KEYBOARD
	compile-time variable, or you can set the environment variable 
	"SDL_KEYBOARD" to a string identifying the keyboard mapping you desire.
	The valid values for these variables can be found in SDL_keyboard.c

	Full support for German and French keyboards under X11 is implemented.

0.9.11:
	The THREADED_EVENTS compile-time define has been replaced with the
	SDL_INIT_EVENTTHREAD flag.  If this flag is passed to SDL_Init(),
	SDL will create a separate thread to perform input event handling.
	If this flag is passed to SDL_Init(), and the OS doesn't support 
	event handling in a separate thread, SDL_Init() will fail.
	Be sure to add calls to SDL_Delay() in your main thread to allow
	the OS to schedule your event thread, or it may starve, leading
	to slow event delivery and/or dropped events.
	Currently MacOS and Win32 do not support this flag, while BeOS 
	and Linux do support it.  I recommend that your application only
	use this flag if absolutely necessary.

	The SDL thread function passed to SDL_CreateThread() now returns a
	status.  This status can be retrieved by passing a non-NULL pointer
	as the 'status' argument to SDL_WaitThread().

	The volume parameter to SDL_MixAudio() has been increased in range
	from (0-8) to (0-128)

	SDL now has a data source abstraction which can encompass a file,
	an area of memory, or any custom object you can envision.  It uses
	these abstractions, SDL_RWops, in the endian read/write functions,
	and the built-in WAV and BMP file loaders.  This means you can load
	WAV chunks from memory mapped files, compressed archives, network
	pipes, or anything else that has a data read abstraction.

	There are three built-in data source abstractions:
	    SDL_RWFromFile(), SDL_RWFromFP(), SDL_RWFromMem()
	along with a generic data source allocation function:
	    SDL_AllocRW()
	These data sources can be used like stdio file pointers with the
	following convenience functions:
	    SDL_RWseek(), SDL_RWread(), SDL_RWwrite(), SDL_RWclose()
	These functions are defined in the new header file "SDL_rwops.h"

	The endian swapping functions have been turned into macros for speed
	and SDL_CalculateEndian() has been removed.  SDL_endian.h now defines
	SDL_BYTEORDER as either SDL_BIG_ENDIAN or SDL_LIL_ENDIAN depending on
	the endianness of the host system.

	The endian read/write functions now take an SDL_RWops pointer
	instead of a stdio FILE pointer, to support the new data source
	abstraction.

	The SDL_*LoadWAV() functions have been replaced with a single
	SDL_LoadWAV_RW() function that takes a SDL_RWops pointer as it's
	first parameter, and a flag whether or not to automatically 
	free it as the second parameter.  SDL_LoadWAV() is a macro for
	backward compatibility and convenience:
	    SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);

	The SDL_*LoadBMP()/SDL_*SaveBMP() functions have each been replaced
	with a single function that takes a SDL_RWops pointer as it's
	first parameter, and a flag whether or not to automatically 
	free it as the second parameter.  SDL_LoadBMP() and SDL_SaveBMP()
	are macros for backward compatibility and convenience:
	    SDL_LoadBMP_RW(SDL_RWFromFile("sample.bmp", "rb"), 1, ...);
	    SDL_SaveBMP_RW(SDL_RWFromFile("sample.bmp", "wb"), 1, ...);
	Note that these functions use SDL_RWseek() extensively, and should
	not be used on pipes or other non-seekable data sources.

0.9.10:
	The Linux SDL_SysWMInfo and SDL_SysWMMsg structures have been 
	extended to support multiple types of display drivers, as well as
        safe access to the X11 display when THREADED_EVENTS is enabled.
        The new structures are documented in the SDL_syswm.h header file.

	Thanks to John Elliott <[e-mail]>, the UK keyboard
	should now work properly, as well as the "Windows" keys on US
	keyboards.

	The Linux CD-ROM code now reads the CD-ROM devices from /etc/fstab
	instead of trying to open each block device on the system.
	The CD must be listed in /etc/fstab as using the iso9660 filesystem.

	On Linux, if you define THREADED_EVENTS at compile time, a separate
	thread will be spawned to gather X events asynchronously from the
	graphics updates.  This hasn't been extensively tested, but it does
	provide a means of handling keyboard and mouse input in a separate
	thread from the graphics thread.  (This is now enabled by default.)

	A special access function SDL_PeepEvents() allows you to manipulate
	the event queue in a thread-safe manner, including peeking at events,
	removing events of a specified type, and adding new events of arbitrary
	type to the queue (use the new 'user' member of the SDL_Event type).

	If you use SDL_PeepEvents() to gather events, then the main graphics
	thread needs to call SDL_PumpEvents() periodically to drive the event
	loop and generate input events.  This is not necessary if SDL has been 
	compiled with THREADED_EVENTS defined, but doesn't hurt.

	A new function SDL_ThreadID() returns the identifier associated with
	the current thread.

0.9.9:
	The AUDIO_STEREO format flag has been replaced with a new 'channels'
	member of the SDL_AudioSpec structure.  The channels are 1 for mono
	audio, and 2 for stereo audio.  In the future more channels may be
	supported for 3D surround sound.

	The SDL_MixAudio() function now takes an additional volume parameter,
	which should be set to SDL_MIX_MAXVOLUME for compatibility with the
	original function.

	The CD-ROM functions which take a 'cdrom' parameter can now be
	passed NULL, and will act on the last successfully opened CD-ROM.

0.9.8:
	No changes, bugfixes only.
	
0.9.7:
	No changes, bugfixes only.
	
0.9.6:
	Added a fast rectangle fill function: SDL_FillRect()

	Addition of a useful function for getting info on the video hardware:
	    const SDL_VideoInfo *SDL_GetVideoInfo(void)
        This function replaces SDL_GetDisplayFormat().

	Initial support for double-buffering:
	  Use the SDL_DOUBLEBUF flag in SDL_SetVideoMode()
	  Update the screen with a new function: SDL_Flip()

	SDL_AllocSurface() takes two new flags:
	SDL_SRCCOLORKEY means that the surface will be used for colorkey blits
	  and if the hardware supports hardware acceleration of colorkey blits
	  between two surfaces in video memory, to place the surface in video
	  memory if possible, otherwise it will be placed in system memory.
	SDL_SRCALPHA means that the surface will be used for alpha blits and
	  if the hardware supports hardware acceleration of alpha blits between
	  two surfaces in video memory, to place the surface in video memory
	  if possible, otherwise it will be placed in system memory.
	SDL_HWSURFACE now means that the surface will be created with the 
	  same format as the display surface, since having surfaces in video
	  memory is only useful for fast blitting to the screen, and you can't
	  blit surfaces with different surface formats in video memory.

0.9.5:
	You can now pass a NULL mask to SDL_WM_SetIcon(), and it will assume
	that the icon consists of the entire image.

	SDL_LowerBlit() is back -- but don't use it on the display surface.
	It is exactly the same as SDL_MiddleBlit(), but doesn't check for
	thread safety.

	Added SDL_FPLoadBMP(), SDL_FPSaveBMP(), SDL_FPLoadWAV(), which take
	a FILE pointer instead of a file name.

	Added CD-ROM audio control API:
	    SDL_CDNumDrives()
	    SDL_CDName()
	    SDL_CDOpen()
	    SDL_CDStatus()
	    SDL_CDPlayTracks()
	    SDL_CDPlay()
	    SDL_CDPause()
	    SDL_CDResume()
	    SDL_CDStop()
	    SDL_CDEject()
	    SDL_CDClose()

0.9.4:
	No changes, bugfixes only.

0.9.3:
	Mouse motion event now includes relative motion information:
	    Sint16 event->motion.xrel, Sint16 event->motion.yrel

	X11 keyrepeat handling can be disabled by defining IGNORE_X_KEYREPEAT
	    (Add -DIGNORE_X_KEYREPEAT to CFLAGS line in obj/x11Makefile)

0.9.2:
	No changes, bugfixes only.

0.9.1:
	Removed SDL_MapSurface() and SDL_UnmapSurface() -- surfaces are now
	automatically mapped on blit.

0.8.0:
	SDL stable release