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Add complete instructions for the brave people wishing to fiddle with the
reference encoder/decoder source. Originally committed as revision 8720 to svn://svn.ffmpeg.org/ffmpeg/trunk
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* http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-610.zip
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* Extract the source into \c "ffmpeg/libavcodec/amr_float".
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* Enable it by passing \c "--enable-amr-nb" to \c "./configure".
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* If you try this on Alpha, you may need to change \c "Word32" to
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* \c "int" in \c "amr/typedef.h".
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*
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* \subsection Fixed-point
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* The fixed-point (TS26.073) can be downloaded from:
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* http://www.3gpp.org/ftp/Specs/archive/26_series/26.073/26073-600.zip
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* Extract the source into \c "ffmpeg/libavcodec/amr".
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* Extract the source into \c "ffmpeg/libavcodec/amr" and add \c "-DMMS_IO" to
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* \c "CFLAGS" in \c "libavcodec/amr/makefile", i.e.
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* \c "CFLAGS = -Wall -pedantic-errors -I. $(CFLAGS_$(MODE)) -D$(VAD) -DMMS_IO".
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* Enable it by passing \c "--enable-amr-nb-fixed" to \c "./configure".
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*
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* \subsection Specification
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