todo

ac3的解码程序

- Add proper error detection.
- Mute frame on error.
- Use proper frame sizes in auxdata parsing - DONE July 1999 - AH
- Separate uint_* typedefs from ac3.h
- Fix coupling channel support - DONE July 1999 - AH
- Add delta bit allocation support - DONE July 1999 - AH
- Detect hrtime on solaris and enable it via config.h
- Add multilevel debug output
- Add downmixing support