RGBA* swf_ExtractImage(TAG*tag, int*dwidth, int*dheight);
RGBA* swf_ImageScale(RGBA*data, int width, int height, int newwidth, int newheight);
+TAG* swf_AddImage(TAG*tag, int bitid, RGBA*mem, int width, int height, int quality);
// swfsound.c
void swf_SetSoundStreamHead(TAG*tag, int avgnumsamples);