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[xonotic/xonotic.git] / misc / builddeps / win64 / sdl / share / man / man3 / SDL_AudioCVT.3

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-.TH "SDL_AudioCVT" "3" "Tue 11 Sep 2001, 22:58" "SDL" "SDL API Reference" 
-.SH "NAME"
-SDL_AudioCVT \- Audio Conversion Structure
-.SH "STRUCTURE DEFINITION"
-.PP
-.nf
-\f(CWtypedef 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;\fR
-.fi
-.PP
-.SH "STRUCTURE DATA"
-.TP 20
-\fBneeded\fR
-Set to one if the conversion is possible
-.TP 20
-\fBsrc_format\fR
-Audio format of the source
-.TP 20
-\fBdest_format\fR
-Audio format of the destination
-.TP 20
-\fBrate_incr\fR
-Rate conversion increment
-.TP 20
-\fBbuf\fR
-Audio buffer
-.TP 20
-\fBlen\fR
-Length of the original audio buffer in bytes
-.TP 20
-\fBlen_cvt\fR
-Length of converted audio buffer in bytes (calculated)
-.TP 20
-\fBlen_mult\fR
-\fBbuf\fR must be \fBlen\fR*\fBlen_mult\fR bytes in size(calculated)
-.TP 20
-\fBlen_ratio\fR
-Final audio size is \fBlen\fR*\fBlen_ratio\fR
-.TP 20
-\fBfilters[10](\&.\&.)\fR
-Pointers to functions needed for this conversion
-.TP 20
-\fBfilter_index\fR
-Current conversion function
-.SH "DESCRIPTION"
-.PP
-The \fBSDL_AudioCVT\fR is used to convert audio data between different formats\&. A \fBSDL_AudioCVT\fR structure is created with the \fI\fBSDL_BuildAudioCVT\fP\fR function, while the actual conversion is done by the \fI\fBSDL_ConvertAudio\fP\fR function\&.
-.PP
-Many of the fields in the \fBSDL_AudioCVT\fR structure should be considered private and their function will not be discussed here\&.
-.IP "\fBUint8 *\fP\fBbuf\fR" 10This points to the audio data that will be used in the conversion\&. It is both the source and the destination, which means the converted audio data overwrites the original data\&. It also means that the converted data may be larger than the original data (if you were converting from 8-bit to 16-bit, for instance), so you must ensure \fBbuf\fR is large enough\&. See below\&.
-.IP "\fBint\fP \fBlen\fR" 10This is the length of the original audio data in bytes\&.
-.IP "\fBint\fP \fBlen_mult\fR" 10As explained above, the audio buffer needs to be big enough to store the converted data, which may be bigger than the original audio data\&. The length of \fBbuf\fR should be \fBlen\fR*\fBlen_mult\fR\&.
-.IP "\fBdouble\fP \fBlen_ratio\fR" 10When you have finished converting your audio data, you need to know how much of your audio buffer is valid\&. \fBlen\fR*\fBlen_ratio\fR is the size of the converted audio data in bytes\&. This is very similar to \fBlen_mult\fR, however when the convert audio data is shorter than the original \fBlen_mult\fR would be 1\&. \fBlen_ratio\fR, on the other hand, would be a fractional number between 0 and 1\&.
-.SH "SEE ALSO"
-.PP
-\fI\fBSDL_BuildAudioCVT\fP\fR, \fI\fBSDL_ConvertAudio\fP\fR, \fI\fBSDL_AudioSpec\fR\fR
-.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:58