https://wiki.multimedia.cx/api.php?action=feedcontributions&feedformat=atom&user=RuzDD 2026-04-23T08:53:32Z User contributions MediaWiki 1.39.5 https://wiki.multimedia.cx/index.php?title=Flash_IMA_ADPCM&diff=15789 2024-06-06T17:43:43Z

<p>RuzDD: </p> <hr /> <div>[[Flash Video|Flash files]] can contain audio data encoded with [[IMA ADPCM]]. However, the file can use a number of different predictor sizes instead of just 4 bits as in most IMA ADPCM formats. 2, 3, and 5-bit predictors are also available.<br /> <br /> According to [https://open-flash.github.io/mirrors/swf-spec-19.pdf SWF SPEC 19] ; the 2bps index table is {-1,2, -1,2}, the 3bps index table is {-1,-1,2,4, -1,-1,2,4}, and the 5bps index table is {-1,-1,-1,-1,-1,-1,-1,-1,1,2,4,6,8,10,13,16, -1,-1,-1,-1,-1,-1,-1,-1,1,2,4,6,8,10,13,16}. The 5bps index table is not linear as it's second and fourth quarters are {1,2,4,6,8,10,13,16} instead of {2,4,6,8,10,12,14,16}.<br /> <br /> [[Category:Audio Codecs]]<br /> [[Category:ADPCM Audio Codecs]]<br /> [[Category:IMA ADPCM Audio Codecs]]</div>

RuzDD