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authorWarren Dukes <warren.dukes@gmail.com>2004-02-23 23:41:20 +0000
committerWarren Dukes <warren.dukes@gmail.com>2004-02-23 23:41:20 +0000
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import from SF CVS
git-svn-id: https://svn.musicpd.org/mpd/trunk@1 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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+
+ libmad - MPEG audio decoder library
+ Copyright (C) 2000-2003 Underbit Technologies, Inc.
+
+ $Id: TODO,v 1.1 2003/08/14 03:57:13 shank 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
+