SDL_AudioCVT(3)

Audio Conversion Structure

Section 3 libsdl1.2-dev bookworm source

Description

SDL_AudioCVT

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