s2bits

这是LPC-10压缩算法的源代码,愿共享之.也希望能赐与MELP方面的算法源码.

#! /bin/sh

# 
# Convert a sound file (either the Sun byte order for 16 bit samples,
# with a suffix of .spd, or the Linux byte order, with a suffix of
# .dsp), to a .bits file (my own made-up suffix for the output of
# lpcsim when using the -ob option for the output file).
# 

if test $# -ne 1 -a $# -ne 2
then
	echo "Usage: `basename $0` 16-bit-audio-file [ lpcsim-exec ]" 1>&2
	exit 1
fi

INPUT_SOUND=$1
ARCH=`arch`

LPCSIM_EXEC=lpcsim
if test $# -eq 2
then
	LPCSIM_EXEC=$2
fi

case $ARCH in
sun4)
	;;
i486)
	;;
*)
	echo "Unknown machine architecture: $ARCH" 1>&2
	echo "Expecting one of: sun4 i486" 1>&2
	exit 1
	;;
esac


TEMP_FILE=

if test `basename $INPUT_SOUND` != `basename $INPUT_SOUND .dsp`
then
	LPCSIM_OUTPUT=`basename $INPUT_SOUND .dsp`.bits
	case $ARCH in
	sun4)
		TEMP_FILE=$INPUT_SOUND-$$
		echo "Converting .dsp input file to temporary .spd file $TEMP_FILE..."
		dd conv=swab < $INPUT_SOUND > $TEMP_FILE
		LPCSIM_INPUT=$TEMP_FILE
		;;
	i486)
		LPCSIM_INPUT=$INPUT_SOUND
		;;
	esac
elif test `basename $INPUT_SOUND` != `basename $INPUT_SOUND .spd`
then
	LPCSIM_OUTPUT=`basename $INPUT_SOUND .spd`.bits
	case $ARCH in
	sun4)
		LPCSIM_INPUT=$INPUT_SOUND
		;;
	i486)
		TEMP_FILE=$INPUT_SOUND-$$
		echo "Converting .spd input file to temporary .dsp file $TEMP_FILE..."
		dd conv=swab < $INPUT_SOUND > $TEMP_FILE
		LPCSIM_INPUT=$TEMP_FILE
		;;
	esac
else
	echo "Missing or unknown file suffix" 1>&2
	echo "Expecting one of: .dsp .spd" 1>&2
	exit 1
fi

echo "Running the command:"
echo "$LPCSIM_EXEC -is $LPCSIM_INPUT -ob $LPCSIM_OUTPUT"
$LPCSIM_EXEC -is $LPCSIM_INPUT -ob $LPCSIM_OUTPUT

if test x$TEMP_FILE != x
then
	echo "Deleting temporary file $TEMP_FILE."
	rm -f $TEMP_FILE
fi