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.\"
.IX Title "pods::SDL::AudioCVT 3pm"
.TH pods::SDL::AudioCVT 3pm "2020-11-09" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
SDL::AudioCVT \-\- Audio Conversion Structure
.SH "CATEGORY"
.IX Header "CATEGORY"
Core, Audio, Structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`SDL::AudioCVT\*(C'\fR is used to convert audio data between different formats. A \f(CW\*(C`SDL::AudioCVT\*(C'\fR structure is created with the 
\&\f(CW\*(C`SDL::AudioCVT\-\*(C'\fRbuild> function, while the actual conversion is done by the \f(CW\*(C`SDL::Audio::convert_audio\*(C'\fR function.
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
This constructor returns an empty \f(CW\*(C`SDL::AudioCVT\*(C'\fR structure.
.SS "build"
.IX Subsection "build"
.Vb 2
\& $cvt = SDL::AudioCVT\->build( $src_format, $src_channels, $src_rate
\&                              $dst_format, $dst_channels, $dst_rate );
.Ve
.PP
Before an \f(CW\*(C`SDL::AudioCVT\*(C'\fR structure can be used to convert audio data it must be initialized with source and destination information.
.PP
\&\f(CW\*(C`src_format\*(C'\fR and \f(CW\*(C`dst_format\*(C'\fR are the source and destination format of the conversion. (For information on audio formats see 
\&\f(CW\*(C`SDL::AudioSpec\*(C'\fR). \f(CW\*(C`src_channels\*(C'\fR and \f(CW\*(C`dst_channels\*(C'\fR are the number of channels in the source and destination formats. 
Finally, \f(CW\*(C`src_rate\*(C'\fR and \f(CW\*(C`dst_rate\*(C'\fR are the frequency or samples-per-second of the source and destination formats. Once again, 
see \f(CW\*(C`SDL::AudioSpec\*(C'\fR.
.PP
Currently (\s-1SDL\-1.2.11\s0) only rate conversions of 2x and (1/2)x with x > 0 are done, nearing the requested rate conversion.
.PP
See \f(CW\*(C`SDL::Audio::convert_audio\*(C'\fR.
.SS "needed"
.IX Subsection "needed"
Set to one if the conversion is possible
.SS "src_format"
.IX Subsection "src_format"
Audio format of the source
.SS "dest_format"
.IX Subsection "dest_format"
Audio format of the destination
.SS "rate_incr"
.IX Subsection "rate_incr"
Rate conversion increment
.SS "len"
.IX Subsection "len"
Length of the original audio buffer in bytes
.SS "len_cvt"
.IX Subsection "len_cvt"
Length of converted audio buffer in bytes (calculated)
.SS "len_mult"
.IX Subsection "len_mult"
\&\f(CW\*(C`buf\*(C'\fR must be \f(CW\*(C`len*len_mult\*(C'\fR bytes in size (calculated)
.SS "len_ratio"
.IX Subsection "len_ratio"
Final audio size is \f(CW\*(C`len*len_ratio\*(C'\fR
.SH "AUTHORS"
.IX Header "AUTHORS"
See \*(L"\s-1AUTHORS\*(R"\s0 in \s-1SDL\s0.