The library contains architecture specific versions of the clz functions
for arm and mips, but the fallback C version for other architectures is
pretty slow.
By using __builtin_clz on GCC (available since GCC 3.4), we get a
significant (20-40 %) speedup of the total running time on x86.
Speed difference: 5.1 s instead of 8.6 s for AAC-LC 128 kbit/s and
3.8 s instead of 4.9 s for HE-AACv2 32 kbit/s, on an i7.
Change-Id: I42a702487e6db4953dca0027710ea4fe266052fd
Also:
- Removed dead code in several source files.
- Minor changes in comments.
- No functional changes. No changes in executed code.
- Added documentation PDFs.
Fixes:
- Don't throw error for invalid bitrate but limit to functional value
- More robust ASC parsing
- More robust handling of corrupt bitstreams
- Handle multiple raw access units
Change-Id: Ib49fe2545ff4185fe924126da702fe84ac5c2d87
