forked from len0rd/rockbox
98c4f65f3a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5955 a1c6a512-1295-4272-9138-f99709370657
69 lines
1.7 KiB
Text
69 lines
1.7 KiB
Text
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libmad - MPEG audio decoder library
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Copyright (C) 2000-2004 Underbit Technologies, Inc.
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$Id$
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===============================================================================
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libmad:
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- more API layers (buffering, PCM samples, dithering, etc.)
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- x86 performance optimization compiler flags
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- function documentation, general docs
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- finish async API
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- parse system streams?
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- MPEG-2 MC, AAC?
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- logarithmic multiplication?
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- multiple frame decoding for better locality of reference?
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- frame serial numbers, Layer III frame continuity checks
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fixed.h:
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- experiment with FPM_INTEL:
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# if 1
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed_t __result; \
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asm ("shrl %3,%1\n\t" \
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"shll %4,%2\n\t" \
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"orl %2,%1" \
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: "=rm" (__result) \
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: "0" (lo), "r" (hi), \
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"I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \
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: "cc"); \
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__result; \
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})
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# else
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed64hi_t __hi_; \
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mad_fixed64lo_t __lo_; \
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mad_fixed_t __result; \
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asm ("sall %2,%1" \
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: "=r" (__hi_) \
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: "0" (hi), "I" (32 - MAD_F_SCALEBITS) \
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: "cc"); \
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asm ("shrl %2,%1" \
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: "=r" (__lo_) \
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: "0" (lo), "I" (MAD_F_SCALEBITS) \
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: "cc"); \
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asm ("orl %1,%2" \
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: "=rm" (__result) \
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: "r" (__hi_), "0" (__lo_) \
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: "cc"); \
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__result; \
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})
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# endif
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libmad Layer I:
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- check frame length sanity
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libmad Layer II:
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- check frame length sanity
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libmad Layer III:
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- circular buffer
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- optimize zero_part from Huffman decoding throughout
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- MPEG 2.5 8000 Hz sf bands? mixed blocks?
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- stereo->mono conversion optimization?
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- enable frame-at-a-time decoding
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- improve portability of huffman.c
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