NAME
SDL::AudioCVT -- Audio Conversion Structure
CATEGORY
Core, Audio, Structure
SYNOPSIS
DESCRIPTION
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.
METHODS
new
This constructor returns an empty SDL::AudioCVT structure.
build
$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.
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
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
AUTHOR
Tobias Leich