todo

PPC流行的播放软件gsplayer源码2.24版

 libmad - MPEG audio decoder library
 Copyright (C) 2000-2003 Underbit Technologies, Inc.

 $Id: TODO,v 1.1 2003/05/29 04:39:34 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 legal bitrate/mode combinations
  - 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