SDL_BuildAudioCVT(3) SDL API Reference SDL_BuildAudioCVT(3)NAME
SDL_BuildAudioCVT - Initializes a SDL_AudioCVT structure for conversion
int SDL_BuildAudioCVT(SDL_AudioCVT *cvt, Uint16 src_format, Uint8 src_channels, int src_rate, Uint16 dst_format, Uint8 dst_channels, int
Before an SDL_AudioCVT structure can be used to convert audio data it must be initialized with source and destination information.
src_format and dst_format are the source and destination format of the conversion. (For information on audio formats see SDL_AudioSpec).
src_channels and dst_channels are the number of channels in the source and destination formats. Finally, src_rate and dst_rate are the fre-
quency or samples-per-second of the source and destination formats. Once again, see SDL_AudioSpec.
Returns -1 if the filter could not be built or 1 if it could.
SDL Tue 11 Sep 2001, 22:58 SDL_BuildAudioCVT(3)
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SDL_AudioCVT(3) SDL API Reference SDL_AudioCVT(3)NAME
SDL_AudioCVT - Audio Conversion Structure
void (*filters)(struct SDL_AudioCVT *cvt, Uint16 format);
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(..) 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.
SDL_BuildAudioCVT, SDL_ConvertAudio, SDL_AudioSpec
SDL Tue 11 Sep 2001, 22:58 SDL_AudioCVT(3)
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