Merge changes from team/russell/codec_resample

This commit imports libresample for use in Asterisk.  It also adds a new codec
module, codec_resample.  This module uses libresample to re-sample signed linear
audio between 8 kHz and 16 kHz.

It also provides an alternative for converting between 16 kHz G.722 and 8 kHz
signed linear when using G.722, which will likely be useful as some people have
complained about volume issues when the current codec_g722 converts to 8 kHz 
signed linear.  But, to test this, you will have to disable the g722-to-slin and
g722-to-slin16 translators in codec_g722.c.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@95501 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/libresample/Makefile.in

@@ -0,0 +1,52 @@
+# Run configure to generate Makefile from Makefile.in on
+# any system supported by GNU autoconf.  For all other
+# systems, use this file as a template to create a
+# working Makefile.
+
+CC = @CC@
+CFLAGS = @CFLAGS@ -Wall
+
+LIBS = @LIBS@ -lm
+
+AR = @AR@
+RANLIB = @RANLIB@
+
+OBJS = \
+	src/resample.c.o \
+	src/resamplesubs.c.o \
+	src/filterkit.c.o
+
+TARGETS = @TARGETS@
+
+all: $(TARGETS)
+
+libresample.a: $(OBJS) Makefile
+	$(AR) ruv libresample.a $(OBJS)
+	ranlib libresample.a
+
+tests/testresample: libresample.a tests/testresample.c
+	$(CC) -o tests/testresample \
+		$(CFLAGS) tests/testresample.c \
+		libresample.a $(LIBS)
+
+tests/compareresample: libresample.a tests/compareresample.c
+	$(CC) -o tests/compareresample \
+		$(CFLAGS) tests/compareresample.c \
+		libresample.a -lsamplerate $(LIBS)
+
+tests/resample-sndfile: libresample.a tests/resample-sndfile.c
+	$(CC) -o tests/resample-sndfile \
+		$(CFLAGS) tests/resample-sndfile.c \
+		libresample.a -lsndfile $(LIBS)
+
+clean:
+	rm -f $(TARGETS) $(OBJS)
+
+distclean: clean
+	rm -f Makefile
+	rm -f config.status config.cache config.log src/config.h
+	rm -f *~ src/*~ tests/*~ include/*~
+
+%.c.o: %.c Makefile include/libresample.h \
+	src/resample_defs.h src/filterkit.h src/config.h
+	$(CC) -c $(CFLAGS) $< -o $@