Section: User Contributed Perl Documentation (3)
SDL::AudioCVT -- Audio Conversion Structure
Core, Audio, Structure
is used to convert audio data between different formats. A "SDL::AudioCVT"
structure is created with the
build> function, while the actual conversion is done by the "SDL::Audio::convert_audio"
This constructor returns an empty "SDL::AudioCVT"
$cvt = SDL::AudioCVT->build( $src_format, $src_channels, $src_rate
$dst_format, $dst_channels, $dst_rate );
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 frequency or samples-per-second of the source and destination formats. Once again,
Currently (SDL-1.2.11) only rate conversions of 2x and (1/2)x with x > 0 are done, nearing the requested rate conversion.
Set to one if the conversion is possible
Audio format of the source
Audio format of the destination
Rate conversion increment
Length of the original audio buffer in bytes
Length of converted audio buffer in bytes (calculated)
must be "len*len_mult"
bytes in size (calculated)
Final audio size is "len*len_ratio"