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sdl_buildaudiocvt(3) [redhat man page]

SDL_BuildAudioCVT(3)						 SDL API Reference					      SDL_BuildAudioCVT(3)

SDL_BuildAudioCVT- Initializes a SDL_AudioCVT structure for conversion SYNOPSIS
#include "SDL.h" int SDL_BuildAudioCVT(SDL_AudioCVT *cvt, Uint16 src_format, Uint8 src_channels, int src_rate, Uint16 dst_format, Uint8 dst_channels, int dst_rate); DESCRIPTION
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. RETURN VALUES
Returns -1 if the filter could not be built or 1 if it could. EXAMPLES
See SDL_ConvertAudio. SEE ALSO
SDL_ConvertAudio, SDL_AudioCVT SDL
Tue 11 Sep 2001, 22:58 SDL_BuildAudioCVT(3)

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SDL_AudioCVT(3) 						 SDL API Reference						   SDL_AudioCVT(3)

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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