SDL::AudioCVT -- Audio Conversion Structure
Core, Audio, Structure
The SDL::AudioCVT is used to convert audio data between different formats.
A SDL::AudioCVT structure is created with the SDL::AudioCVT-build> function,
while the actual conversion is done by the SDL::Audio::convert_audio function.
This constructor returns an empty SDL::AudioCVT structure.
$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, see SDL::AudioSpec.
Currently (SDL-1.2.11) only rate conversions of 2x and (1/2)x with x > 0 are done, nearing the requested rate conversion.
See SDL::Audio::convert_audio.
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)
buf must be len*len_mult bytes in size (calculated)
Final audio size is len*len_ratio
See "AUTHORS" in SDL.
