SDL_GetGammaRamp(3) SDL API Reference SDL_GetGammaRamp(3)NAME
SDL_GetGammaRamp- Gets the color gamma lookup tables for the display
SYNOPSIS
#include "SDL.h"
int SDL_GetGammaRamp(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);
DESCRIPTION
Gets the gamma translation lookup tables currently used by the display. Each table is an array of 256 Uint16 values.
Not all display hardware is able to change gamma.
RETURN VALUE
Returns -1 on error.
SEE ALSO
SDL_SetGamma SDL_SetGammaRamp
SDL Tue 11 Sep 2001, 23:01 SDL_GetGammaRamp(3)
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SDL_AudioCVT(3) SDL API Reference SDL_AudioCVT(3)NAME
SDL_AudioCVT - Audio Conversion Structure
STRUCTURE DEFINITION
typedef struct{
int needed;
Uint16 src_format;
Uint16 dest_format;
double rate_incr;
Uint8 *buf;
int len;
int len_cvt;
int len_mult;
double len_ratio;
void (*filters[10])(struct SDL_AudioCVT *cvt, Uint16 format);
int filter_index;
} SDL_AudioCVT;
STRUCTURE DATA
needed Set to one if the conversion is possible
src_format Audio format of the source
dest_format Audio format of the destination
rate_incr Rate conversion increment
buf Audio buffer
len Length of the original audio buffer in bytes
len_cvt Length of converted audio buffer in bytes (calculated)
len_mult buf must be len*len_mult bytes in size(calculated)
len_ratio Final audio size is len*len_ratio
filters[10](..) Pointers to functions needed for this conversion
filter_index Current conversion function
DESCRIPTION
The SDL_AudioCVT is used to convert audio data between different formats. A SDL_AudioCVT structure is created with the SDL_BuildAudioCVT
function, while the actual conversion is done by the SDL_ConvertAudio function.
Many of the fields in the SDL_AudioCVT structure should be considered private and their function will not be discussed here.
Uint8 *buf
int len
int len_mult
double len_ratio
SEE ALSO
SDL_BuildAudioCVT, SDL_ConvertAudio, SDL_AudioSpec
SDL Tue 11 Sep 2001, 22:58 SDL_AudioCVT(3)
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