libmad - MPEG audio decoder library Copyright (C) 2000-2004 Underbit Technologies, Inc. $Id: TODO,v 1.3 2004/02/05 09:02:39 rob Exp $ =============================================================================== libmad: - more API layers (buffering, PCM samples, dithering, etc.) - x86 performance optimization compiler flags - function documentation, general docs - finish async API - parse system streams? - MPEG-2 MC, AAC? - logarithmic multiplication? - multiple frame decoding for better locality of reference? - frame serial numbers, Layer III frame continuity checks fixed.h: - experiment with FPM_INTEL: # if 1 # define mad_f_scale64(hi, lo) \ ({ mad_fixed_t __result; \ asm ("shrl %3,%1\n\t" \ "shll %4,%2\n\t" \ "orl %2,%1" \ : "=rm" (__result) \ : "0" (lo), "r" (hi), \ "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \ : "cc"); \ __result; \ }) # else # define mad_f_scale64(hi, lo) \ ({ mad_fixed64hi_t __hi_; \ mad_fixed64lo_t __lo_; \ mad_fixed_t __result; \ asm ("sall %2,%1" \ : "=r" (__hi_) \ : "0" (hi), "I" (32 - MAD_F_SCALEBITS) \ : "cc"); \ asm ("shrl %2,%1" \ : "=r" (__lo_) \ : "0" (lo), "I" (MAD_F_SCALEBITS) \ : "cc"); \ asm ("orl %1,%2" \ : "=rm" (__result) \ : "r" (__hi_), "0" (__lo_) \ : "cc"); \ __result; \ }) # endif libmad Layer I: - check frame length sanity libmad Layer II: - check frame length sanity libmad Layer III: - circular buffer - optimize zero_part from Huffman decoding throughout - MPEG 2.5 8000 Hz sf bands? mixed blocks? - stereo->mono conversion optimization? - enable frame-at-a-time decoding - improve portability of huffman.c