Mercurial > sdl-ios-xcode
view docs/man3/SDL_AudioSpec.3 @ 1120:8e1fde455471
Patch by me to fix crash described below.
--ryan.
To: sdl@libsdl.org
From: Rainer Deyke <rainerd@eldwood.com>
Date: Tue, 16 Aug 2005 01:08:18 -0600
Subject: [SDL] Bug report: SDL_CreateRGBSurface with SDL_HWSURFACE crashes
If SDL is in full-screen mode with a hardware video surface on OS X,
SDL_CreateRGBSurface with SDL_HWSURFACE crashes. The crash occurs on
line 109 of SDL_Surface.c. This was tested on OS X 10.3.9 with both SDL
1.2.8 and the latest CVS. Here is a small C++ program that demonstrates
the problem:
#include "SDL.h"
#include <stdio.h>
namespace {
void wait_for_key()
{
SDL_Event e;
printf("%d\n", SDL_GetAppState());
while (SDL_WaitEvent(&e)) {
if (e.type == SDL_KEYDOWN || e.type == SDL_QUIT) return;
}
}
}
int main(int, char *[])
{
SDL_Init(SDL_INIT_VIDEO);
SDL_Surface *screen
= SDL_SetVideoMode(640, 480, 32, SDL_FULLSCREEN | SDL_HWSURFACE);
SDL_Surface *s = SDL_CreateRGBSurface(SDL_HWSURFACE, 640, 480, 32,
screen->format->Rmask, screen->format->Gmask,
screen->format->Bmask, screen->format->Amask);
wait_for_key();
if (s) SDL_FreeSurface(s);
SDL_Quit();
printf("Success!\n");
return 0;
}
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 18 Aug 2005 06:46:32 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
line wrap: on
line source
.TH "SDL_AudioSpec" "3" "Tue 11 Sep 2001, 22:58" "SDL" "SDL API Reference" .SH "NAME" SDL_AudioSpec\- Audio Specification Structure .SH "STRUCTURE DEFINITION" .PP .nf \f(CWtypedef struct{ int freq; Uint16 format; Uint8 channels; Uint8 silence; Uint16 samples; Uint32 size; void (*callback)(void *userdata, Uint8 *stream, int len); void *userdata; } SDL_AudioSpec;\fR .fi .PP .SH "STRUCTURE DATA" .TP 20 \fBfreq\fR Audio frequency in samples per second .TP 20 \fBformat\fR Audio data format .TP 20 \fBchannels\fR Number of channels: 1 mono, 2 stereo .TP 20 \fBsilence\fR Audio buffer silence value (calculated) .TP 20 \fBsamples\fR Audio buffer size in samples .TP 20 \fBsize\fR Audio buffer size in bytes (calculated) .TP 20 \fBcallback(\&.\&.)\fR Callback function for filling the audio buffer .TP 20 \fBuserdata\fR Pointer the user data which is passed to the callback function .SH "DESCRIPTION" .PP The \fBSDL_AudioSpec\fR structure is used to describe the format of some audio data\&. This structure is used by \fI\fBSDL_OpenAudio\fP\fR and \fI\fBSDL_LoadWAV\fP\fR\&. While all fields are used by \fBSDL_OpenAudio\fP only \fBfreq\fR, \fBformat\fR, \fBsamples\fR and \fBchannels\fR are used by \fBSDL_LoadWAV\fP\&. We will detail these common members here\&. .TP 20 \fBfreq\fR The number of samples sent to the sound device every second\&. Common values are 11025, 22050 and 44100\&. The higher the better\&. .TP 20 \fBformat\fR Specifies the size and type of each sample element .IP "\fBAUDIO_U8\fP" 10Unsigned 8-bit samples .IP "\fBAUDIO_S8\fP" 10Signed 8-bit samples .IP "\fBAUDIO_U16\fP or \fBAUDIO_U16LSB\fP" 10Unsigned 16-bit little-endian samples .IP "\fBAUDIO_S16\fP or \fBAUDIO_S16LSB\fP" 10Signed 16-bit little-endian samples .IP "\fBAUDIO_U16MSB\fP" 10Unsigned 16-bit big-endian samples .IP "\fBAUDIO_S16MSB\fP" 10Signed 16-bit big-endian samples .IP "\fBAUDIO_U16SYS\fP" 10Either \fBAUDIO_U16LSB\fP or \fBAUDIO_U16MSB\fP depending on you systems endianness .IP "\fBAUDIO_S16SYS\fP" 10Either \fBAUDIO_S16LSB\fP or \fBAUDIO_S16MSB\fP depending on you systems endianness .TP 20 \fBchannels\fR The number of seperate sound channels\&. 1 is mono (single channel), 2 is stereo (dual channel)\&. .TP 20 \fBsamples\fR When used with \fI\fBSDL_OpenAudio\fP\fR this refers to the size of the audio buffer in samples\&. A sample a chunk of audio data of the size specified in \fBformat\fR mulitplied by the number of channels\&. When the \fBSDL_AudioSpec\fR is used with \fI\fBSDL_LoadWAV\fP\fR \fBsamples\fR is set to 4096\&. .SH "SEE ALSO" .PP \fI\fBSDL_OpenAudio\fP\fR, \fI\fBSDL_LoadWAV\fP\fR ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:58