Mercurial > sdl-ios-xcode
view src/hermes/HeadX86.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 | 39b9405d3cb6 |
children |
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/* Header definitions for the x86 routines for the HERMES library Copyright (c) 1998 Christian Nentwich (brn@eleet.mcb.at) This source code is licensed under the GNU LGPL Please refer to the file COPYING.LIB contained in the distribution for licensing conditions */ #ifndef __HERMES_HEAD_X86__ #define __HERMES_HEAD_X86__ #ifdef X86_ASSEMBLER /* If you can't stand IFDEFS, then close your eyes now, please :) */ /* Ok, we start with normal function definitions */ #ifdef __cplusplus extern "C" { #endif void STACKCALL ConvertX86(HermesConverterInterface *); void STACKCALL ClearX86_32(HermesClearInterface *); void STACKCALL ClearX86_24(HermesClearInterface *); void STACKCALL ClearX86_16(HermesClearInterface *); void STACKCALL ClearX86_8(HermesClearInterface *); int STACKCALL Hermes_X86_CPU(); void ConvertX86p32_32BGR888(); void ConvertX86p32_32RGBA888(); void ConvertX86p32_32BGRA888(); void ConvertX86p32_24RGB888(); void ConvertX86p32_24BGR888(); void ConvertX86p32_16RGB565(); void ConvertX86p32_16BGR565(); void ConvertX86p32_16RGB555(); void ConvertX86p32_16BGR555(); void ConvertX86p32_8RGB332(); void ConvertX86p16_32RGB888(); void ConvertX86p16_32BGR888(); void ConvertX86p16_32RGBA888(); void ConvertX86p16_32BGRA888(); void ConvertX86p16_24RGB888(); void ConvertX86p16_24BGR888(); void ConvertX86p16_16BGR565(); void ConvertX86p16_16RGB555(); void ConvertX86p16_16BGR555(); void ConvertX86p16_8RGB332(); void CopyX86p_4byte(); void CopyX86p_3byte(); void CopyX86p_2byte(); void CopyX86p_1byte(); void ConvertX86pI8_32(); void ConvertX86pI8_24(); void ConvertX86pI8_16(); extern int ConvertX86p16_32RGB888_LUT_X86[512]; extern int ConvertX86p16_32BGR888_LUT_X86[512]; extern int ConvertX86p16_32RGBA888_LUT_X86[512]; extern int ConvertX86p16_32BGRA888_LUT_X86[512]; #ifdef __cplusplus } #endif /* Now fix up the ELF underscore problem */ #if (defined(__ELF__) && defined(__GNUC__)) || defined(__SUNPRO_C) #ifdef __cplusplus extern "C" { #endif extern int _Hermes_X86_CPU(); extern void _ConvertX86(HermesConverterInterface *); extern void _ConvertX86p32_32BGR888(); extern void _ConvertX86p32_32RGBA888(); extern void _ConvertX86p32_32BGRA888(); extern void _ConvertX86p32_24RGB888(); extern void _ConvertX86p32_24BGR888(); extern void _ConvertX86p32_16RGB565(); extern void _ConvertX86p32_16BGR565(); extern void _ConvertX86p32_16RGB555(); extern void _ConvertX86p32_16BGR555(); extern void _ConvertX86p32_8RGB332(); extern void _ConvertX86p16_16BGR565(); extern void _ConvertX86p16_16RGB555(); extern void _ConvertX86p16_16BGR555(); extern void _ConvertX86p16_8RGB332(); #define Hermes_X86_CPU _Hermes_X86_CPU #define ConvertX86 _ConvertX86 #define ConvertX86p32_32BGR888 _ConvertX86p32_32BGR888 #define ConvertX86p32_32RGBA888 _ConvertX86p32_32RGBA888 #define ConvertX86p32_32BGRA888 _ConvertX86p32_32BGRA888 #define ConvertX86p32_24RGB888 _ConvertX86p32_24RGB888 #define ConvertX86p32_24BGR888 _ConvertX86p32_24BGR888 #define ConvertX86p32_16RGB565 _ConvertX86p32_16RGB565 #define ConvertX86p32_16BGR565 _ConvertX86p32_16BGR565 #define ConvertX86p32_16RGB555 _ConvertX86p32_16RGB555 #define ConvertX86p32_16BGR555 _ConvertX86p32_16BGR555 #define ConvertX86p32_8RGB332 _ConvertX86p32_8RGB332 #define ConvertX86p16_16BGR565 _ConvertX86p16_16BGR565 #define ConvertX86p16_16RGB555 _ConvertX86p16_16RGB555 #define ConvertX86p16_16BGR555 _ConvertX86p16_16BGR555 #define ConvertX86p16_8RGB332 _ConvertX86p16_8RGB332 #ifdef __cplusplus } #endif #endif /* ELF & GNU */ /* Make it run with WATCOM C */ #ifdef __WATCOMC__ #pragma warning 601 9 #pragma aux Hermes_X86_CPU "_*" #pragma aux ConvertX86 "_*" modify [EAX EBX ECX EDX ESI EDI] #pragma aux ClearX86_32 "_*" modify [EAX EBX ECX EDX ESI EDI] #pragma aux ClearX86_24 "_*" modify [EAX EBX ECX EDX ESI EDI] #pragma aux ClearX86_16 "_*" modify [EAX EBX ECX EDX ESI EDI] #pragma aux ClearX86_8 "_*" modify [EAX EBX ECX EDX ESI EDI] #pragma aux ConvertX86p32_32BGR888 "_*" #pragma aux ConvertX86p32_32RGBA888 "_*" #pragma aux ConvertX86p32_32BGRA888 "_*" #pragma aux ConvertX86p32_24RGB888 "_*" #pragma aux ConvertX86p32_24BGR888 "_*" #pragma aux ConvertX86p32_16RGB565 "_*" #pragma aux ConvertX86p32_16BGR565 "_*" #pragma aux ConvertX86p32_16RGB555 "_*" #pragma aux ConvertX86p32_16BGR555 "_*" #pragma aux ConvertX86p32_8RGB332 "_*" #pragma aux ConvertX86p16_32RGB888 "_*" #pragma aux ConvertX86p16_32BGR888 "_*" #pragma aux ConvertX86p16_32RGBA888 "_*" #pragma aux ConvertX86p16_32BGRA888 "_*" #pragma aux ConvertX86p16_24RGB888 "_*" #pragma aux ConvertX86p16_24BGR888 "_*" #pragma aux ConvertX86p16_16BGR565 "_*" #pragma aux ConvertX86p16_16RGB555 "_*" #pragma aux ConvertX86p16_16BGR555 "_*" #pragma aux ConvertX86p16_8RGB332 "_*" #pragma aux CopyX86p_4byte "_*" #pragma aux CopyX86p_3byte "_*" #pragma aux CopyX86p_2byte "_*" #pragma aux CopyX86p_1byte "_*" #pragma aux ConvertX86pI8_32 "_*" #pragma aux ConvertX86pI8_24 "_*" #pragma aux ConvertX86pI8_16 "_*" #pragma aux ConvertX86p16_32RGB888_LUT_X86 "_*" #pragma aux ConvertX86p16_32BGR888_LUT_X86 "_*" #pragma aux ConvertX86p16_32RGBA888_LUT_X86 "_*" #pragma aux ConvertX86p16_32BGRA888_LUT_X86 "_*" #endif /* __WATCOMC__ */ #endif /* X86_ASSEMBLER */ #endif