void VDInputFileFLM::Init(const wchar_t *filename) {
bool valid = false;
mFile.open(filename, nsVDFile::kRead | nsVDFile::kDenyWrite | nsVDFile::kOpenExisting);
sint64 fsize = mFile.size();
FilmstripHeader mHeader;
if (fsize >= 36) {
mFile.seek(fsize - 36);
char hdrbuf[36];
mFile.read(hdrbuf, 36);
mHeader.Read(hdrbuf);
if (mHeader.Validate()) {
mFrameSize = (uint32)mHeader.width * ((uint32)mHeader.height + (uint32)mHeader.leading) * 4;
if ((uint64)mFrameSize * (uint16)mHeader.numFrames + 36 <= fsize)
valid = true;
}
}
if (!valid)
throw MyError("%ls does not appear to be a valid Adobe filmstrip file.", mFile.getFilenameForError());
mVisibleFrameSize = (uint32)mHeader.width * (uint32)mHeader.height * 4;
mFrameWidth = (uint32)mHeader.width;
mFrameHeight = (uint32)mHeader.height;
mFrameCount = (uint32)mHeader.numFrames;
mFrameRate.Assign((uint32)mHeader.framesPerSec, 1);
}
DetectionConfidence DetectBySignature(const void *pHeader, sint32 nHeaderSize, const void *pFooter, sint32 nFooterSize, sint64 nFileSize) {
if (nFooterSize >= 36) {
const uint8 *buf = (const uint8 *)pFooter;
FilmstripHeader hdr;
hdr.Read(buf + nFooterSize - 36);
if (hdr.Validate())
return kDC_High;
}
return kDC_None;
}
int DetectBySignature(const void *pHeader, sint32 nHeaderSize, const void *pFooter, sint32 nFooterSize, sint64 nFileSize) {
if (nFooterSize >= 36) {
const uint8 *buf = (const uint8 *)pFooter;
FilmstripHeader hdr;
hdr.Read(buf + nFooterSize - 36);
if (hdr.Validate())
return 1;
}
return -1;
}