サウンド_Speex_圧縮 - hsk/swfspec_ja GitHub Wiki

Speex 圧縮

Starting with SWF 10, a SWF file can store audio samples that have been compressed using the free, open source Speex voice codec (see speex.org). Speex audio is stored as format 11 in a DefineSound tag. While Speex supports a range of sample rates, Speex audio encoded in SWF is always encoded at 16 kHz; the SoundRate field of the DefineSound tag is disregarded. The SoundType and SoundSize fields are also ingored in the case of Speex. Speex in SWF is always mono and always decodes to 16-bit audio samples internally. Speex 1.2 beta 3 is compiled into the Flash Player as of version 10 (10.0.12).

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