SDL_AudioCVT − Audio Conversion Structure
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;
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 |
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
SDL_BuildAudioCVT, SDL_ConvertAudio, SDL_AudioSpec
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