New portable Musepack decoder library, including fixed-point mode Options

[Peter]

UPDATE: source posted here is outdated now, newer version is hosted on musepack.net.

Full C++ source in post attachement.

License: LGPL.

Features:
- Switchable fixed-point and floating-point modes - enable/disable "#define MPC_FIXED_POINT" in mpc_math.h
- Endian-safe, verified running correctly on big-endian machines
- Multiinstance and multithread safe
- File access callbacks
- No assembly code used, for full portability

Verified correctly compiling/running under:
- win32 / x86 / MSVC6 + SP5 + processor pack - very fast floating-point mode (goes above 200x on ~2GHz machines), fixed-point mode is significantly slower (~60x)
- win32 / x86 / MSVC7.1 - slightly faster than MSVC6, fixed-point mode still relatively slow
- win32 / x86 / DMCPP - fixed-point mode faster than MSVC, floating-point mode slower than expected with strange slowdowns when compiled with speed optimizations enabled
- wince / ARM (32bit) / eVC4 + SP3 - fixed-point decoding speed on 400MHz XScale CPU is about 10x realtime
- Darwin 7.3.0, MacOS X 10.3.3 / PowerPC970/G5 / GCC 3.3 - about 80x-100x decoding speed in both modes on 2GHz G5, thanks to TrNSZ for testing/feedback

I'm planning to put this in official MPC CVS, unfortunately I can't do that right now because corecodec server has been down for serveral days.

Attached File(s)

 mpcdec.zip ( 45.56K ) Number of downloads: 1804

 

[picard]

Yes, I'am using the C++ version and the SeekTable was in the old version (before it was renamed to libmusepack I think).

Any more info in which case does it cause artifacts? More states should be saved not just frame length to be able to properly seek? Because for a mediaplayer the current non SeekTable solution is not really acceptable.

[Lefungus]

Some files have huge frame dependencies. There's no way to know how much, so the fast seeking can break on any file randomly. So although it can be made to seek correctly on most of the files, it's not error-proof.