filter realize mpg4, h263, h264, divx and other format decoder, use the compilation of the kernel, you may read up a little trouble, but the filter used is a standard part of the c++ can combine these to understand

dshow(MP4解码器)
................\authors.txt
................\Debug
................\dshow.dsp
................\dshow.dsw
................\dshow.ncb
................\dshow.opt
................\dshow.plg
................\dxpatch
................\.......\dx90sdk-update-gcc.patch
................\.......\dx90sdk-update-gcc.txt
................\Makefile
................\sources.inc
................\src
................\...\CAbout.cpp
................\...\CAbout.h
................\...\config.c
................\...\config.h
................\...\Configure.cpp
................\...\CXvidDecoder.cpp
................\...\CXvidDecoder.h
................\...\debug.h
................\...\IXvidDecoder.h
................\...\resource.h
................\...\xvid.ax.aps
................\...\xvid.ax.def
................\...\xvid.ax.rc

src
...\bitstream
...\.........\bitstream.c
...\.........\bitstream.h
...\.........\cbp.c
...\.........\cbp.h
...\.........\mbcoding.c
...\.........\mbcoding.h
...\.........\vlc_codes.h
...\.........\x86_asm
...\.........\.......\cbp_3dne.asm
...\.........\.......\cbp_mmx.asm
...\.........\.......\cbp_sse2.asm
...\.........\zigzag.h
...\dct
...\...\fdct.c
...\...\fdct.h
...\...\ia64_asm
...\...\........\fdct_ia64.s
...\...\........\genidct.py
...\...\........\idct_fini.s
...\...\........\idct_ia64_ecc.s
...\...\........\idct_ia64_gcc.s
...\...\........\idct_init.s
...\...\idct.c
...\...\idct.h
...\...\ppc_asm
...\...\.......\idct_altivec.c
...\...\README.IJG
...\...\simple_idct.c
...\...\x86_64_asm
...\...\..........\fdct_mmx_skal.asm
...\...\..........\idct_mmx.asm
...\...\x86_asm
...\...\.......\fdct_mmx_ffmpeg.asm
...\...\.......\fdct_mmx_skal.asm
...\...\.......\fdct_sse2_skal.asm
...\...\.......\idct_3dne.asm
...\...\.......\idct_mmx.asm
...\...\.......\idct_sse2_dmitry.asm
...\...\.......\simple_idct_mmx.asm
...\decoder.c
...\decoder.h
...\encoder.c
...\encoder.h
...\global.h
...\image
...\.....\colorspace.c
...\.....\colorspace.h
...\.....\font.c
...\.....\font.h
...\.....\ia64_asm
...\.....\........\interpolate8x8_ia64.s
...\.....\........\interpolate8x8_ia64_exact.s
...\.....\........\README
...\.....\image.c
...\.....\image.h
...\.....\interpolate8x8.c
...\.....\interpolate8x8.h
...\.....\postprocessing.c
...\.....\postprocessing.h
...\.....\ppc_asm
...\.....\.......\colorspace_altivec.c
...\.....\.......\interpolate8x8_altivec.c
...\.....\.......\qpel_altivec.c
...\.....\qpel.c
...\.....\qpel.h
...\.....\reduced.c
...\.....\reduced.h
...\.....\x86_64_asm
...\.....\..........\interpolate8x8_mmx.asm
...\.....\..........\interpolate8x8_xmm.asm

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