Provided by: libsdl-perl_2.548-1build1_amd64
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.
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"
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