Mercurial > sdl-ios-xcode
view src/events/SDL_events_c.h @ 4216:5b99971a27b4 SDL-1.2
Fixed bug #698
Hans de Goede 2009-02-13 01:10:52 PST
Since the new "glitch free" version of pulseaudio (used in Fedora 10 amongst
others), the sound of SDL using apps (like a simple playmus call) has been
crackling.
While looking in to fixing this I noticed that the current pulseaudio code in
SDL uses pa_simple. However pa_simple uses a thread to pump pulseaudio events
and ipc, given that SDL already has its own thread for audio handling this is
clearly suboptimal, leading to unnecessary context switching IPC, etc. Also
pa_simple does not allow one to implement the WaitAudio() callback for SDL
audiodrivers properly.
Given that my work is mostly a rewrite (although some original pieces remain)
I'm attaching the new .c and .h file, as that is easier to review then the huge
diff.
Let me know if you also want the diff.
This new version has the following features:
-no longer use an additional thread next to the SDL sound thread
-do not crackle with glitch free audio
-when used with a newer pulse, which does glitch free audio, the total latency
is
the same as with the alsa driver
-proper WaitAudio() implementation, saving another mixlen worth of latency
-adds a WaitDone() implementation
This patch has been written in consultancy with Lennart Poetering (the
pulseaudio author) and has been reviewed by him for correct use of the pa API.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Mon, 21 Sep 2009 09:27:08 +0000 |
parents | a1b03ba2fcd0 |
children | 429c8dd3175d |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* Useful functions and variables from SDL_events.c */ #include "SDL_events.h" /* Start and stop the event processing loop */ extern int SDL_StartEventLoop(Uint32 flags); extern void SDL_StopEventLoop(void); extern void SDL_QuitInterrupt(void); extern void SDL_Lock_EventThread(void); extern void SDL_Unlock_EventThread(void); extern Uint32 SDL_EventThreadID(void); /* Event handler init routines */ extern int SDL_AppActiveInit(void); extern int SDL_KeyboardInit(void); extern int SDL_MouseInit(void); extern int SDL_QuitInit(void); /* Event handler quit routines */ extern void SDL_AppActiveQuit(void); extern void SDL_KeyboardQuit(void); extern void SDL_MouseQuit(void); extern void SDL_QuitQuit(void); /* The event filter function */ extern SDL_EventFilter SDL_EventOK; /* The array of event processing states */ extern Uint8 SDL_ProcessEvents[SDL_NUMEVENTS]; /* Internal event queueing functions (from SDL_active.c, SDL_mouse.c, SDL_keyboard.c, SDL_quit.c, SDL_events.c) */ extern int SDL_PrivateAppActive(Uint8 gain, Uint8 state); extern int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y); extern int SDL_PrivateMouseButton(Uint8 state, Uint8 button,Sint16 x,Sint16 y); extern int SDL_PrivateKeyboard(Uint8 state, SDL_keysym *key); extern int SDL_PrivateResize(int w, int h); extern int SDL_PrivateExpose(void); extern int SDL_PrivateQuit(void); extern int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message); /* Used by the activity event handler to remove mouse focus */ extern void SDL_ResetMouse(void); /* Used by the activity event handler to remove keyboard focus */ extern void SDL_ResetKeyboard(void); /* Used by the event loop to queue pending keyboard repeat events */ extern void SDL_CheckKeyRepeat(void); /* Used by the OS keyboard code to detect whether or not to do UNICODE */ #ifndef DEFAULT_UNICODE_TRANSLATION #define DEFAULT_UNICODE_TRANSLATION 0 /* Default off because of overhead */ #endif extern int SDL_TranslateUNICODE;