Sigcomp in asterisk - Part -1

Libraries for Sigcomp

1. Libsigcomp – C++ library .due to C++ codes its hard to integrate in Asterisk
2. tinySIGCOMP – C library and part of doubango Stack .

In asterisk 1.8.3.2 We are using tinySIGCOMP ( needs tinySAK  )

Issues

Asterisk uses PTHREAD_MUTEX_RECURSIVE_NP while Sigcomp uses PTHREAD_MUTEX_RECURSIVE ,Centos & Xtensa Kernel Also has Non –portable version (NP) version so Sigcomp won’t Compile .

Getting Sources

Doubango 2.0 has to be used ,in TINYXCAP we are using Doubango 1.0

Cd

asterisk_src/add-ons/sigcomp

svn checkout http://doubango.googlecode.com/svn/branches/2.0/doubango/tinySAK tinySAK

svn checkout http://doubango.googlecode.com/svn/branches/2.0/doubango/tinySIGCOMP tinySIGCOMP

Compile tinySAK

Cd tinysak

Sh autogen.sh

./configure

replace THREAD_MUTEX_RECURSIVE in src/tsk_mutex.c to PTHREAD_MUTEX_RECURSIVE_NP

Edit tinySAK/src/Makefile & tinySAK/test/Makefile  and replace

LIBTOOL = $(SHELL) $(top_builddir)/libtool with LIBTOOL= libtool

Edit tinySAK/test/Makefile and following

LDFLAGS =-lpthread

Make install will install libraries and headers in

/usr/local/include/tinySAK/*.h

And in

/usr/local/lib/libtinySAK.la

/usr/local/lib/libtinySAK.a

/usr/local/lib/libtinySAK.so.0.0.0

Compiling SIGCOMP

Cd tinySIGCOMP

Add Makefile and following path

#APP := lib$(PROJECT)_$(MARCH).$(EXT)

EXT := a

APP := libtinySIGCOMP.$(EXT)

CC := ${CROSS_COMPILE}gcc

#CFLAGS := $(CFLAGS_LIB) -I../tinySAK/src -I./src -I$(BUILDROOT_TOOL_PATH)/usr/include/libxml2

#LDFLAGS := $(LDFLAGS_LIB) -ltinySAK_$(MARCH) -L$(BUILDROOT_TOOL_PATH)/usr/lib

CFLAGS := $(CFLAGS_LIB) -I../tinySAK/src -I./src

LDFLAGS := $(LDFLAGS_LIB) -ltinySAK_$(MARCH) -L$(BUILDROOT_TOOL_PATH)/usr/lib

all: $(APP)

OBJS = \

            src/adler32.o\

            src/compress.o\

            src/deflate.o\

            src/tcomp.o\

            src/tcomp_buffer.o\

            src/tcomp_compartment.o\

            src/tcomp_compressordata.o\

            src/tcomp_compressordisp.o\

            src/tcomp_compressor_deflate.o\

            src/tcomp_compressor_dummy.o\

            src/tcomp_decompressordisp.o\

            src/tcomp_deflatedata.o\

            src/tcomp_deflatedata.ghost.o\

            src/tcomp_deflatedata.zlib.o\

            src/tcomp_dicts.o\

            src/tcomp_manager.o\

            src/tcomp_message.o\

            src/tcomp_nackinfo.o\

            src/tcomp_params.o\

            src/tcomp_reqfeed.o\

            src/tcomp_result.o\

            src/tcomp_state.o\

            src/tcomp_statehandler.o\

            src/tcomp_udvm.bytecopy.o\

            src/tcomp_udvm.o\

            src/tcomp_udvm.instructions.o\

            src/tcomp_udvm.nack.o\

            src/tcomp_udvm.operands.o\

            src/tcomp_udvm.statemanagment.o\

            src/trees.o\

            src/zutil.o\

           

$(APP): $(OBJS)

ifeq ($(EXT), a)

            $(AR) rcs $@ $^

else

            $(CC) $(LDFLAGS) -o $@ $^

endif

%.o: %.c

            $(CC) -c $(INCLUDE) $(CFLAGS) $< -o $@

           

install: $(APP)

            $(ANDROID_SDK_ROOT)/tools/adb remount

            $(ANDROID_SDK_ROOT)/tools/adb push $(APP) $(LIB_DIR)/$(APP)

            $(ANDROID_SDK_ROOT)/tools/adb shell chmod 777 $(LIB_DIR)/$(APP)

           

clean:

            @rm -f $(OBJS) $(APP)

Make to compile ,which generates sigcomp library libtinySIGCOMP.a

Integrating with Asterisk

Compiling with Asterisk

Change channels/Makefile as below :

--- channels/Makefile2  2012-01-22 12:47:55.000000000 +0530

+++ channels/Makefile   2012-01-23 11:50:49.000000000 +0530

@@ -71,7 +71,12 @@ dist-clean::

 $(if $(filter chan_iax2,$(EMBEDDED_MODS)),modules.link,chan_iax2.so): iax2-parser.o iax2-provision.o

 iax2-parser.o iax2-provision.o: _ASTCFLAGS+=$(call MOD_ASTCFLAGS,chan_iax2)

-$(if $(filter chan_sip,$(EMBEDDED_MODS)),modules.link,chan_sip.so): $(subst .c,.o,$(wildcard sip/*.c))

+AST_ADDONS_IMS=$(ASTTOPDIR)/addons/sigcomp

+chan_sip.o: _ASTCFLAGS+=-I$(AST_ADDONS_IMS) -I/home/alok/latest_cvs/asterisk_src/add-ons/sigcomp/tinySIGCOMP/src

+

+#chan_sip.o: _ASTCFLAGS+=-I$(AST_ADDONS_IMS)

+#$(if $(filter chan_sip,$(EMBEDDED_MODS)),modules.link,chan_sip.so): $(subst .c,.o,$(wildcard sip/*.c)) $(subst .c,.o,$(wildcard $(AST_ADDONS_IMS)/*.c))

+$(if $(filter chan_sip,$(EMBEDDED_MODS)),modules.link,chan_sip.so): $(subst .c,.o,$(wildcard sip/*.c)) /home/alok/latest_cvs/asterisk_src/add-ons/sigcomp/tinySIGCOMP/libtinySIGCOMP.a /usr/lib/libtinySAK.so.0

 $(subst .c,.o,$(wildcard sip/*.c)): _ASTCFLAGS+=$(call MOD_ASTCFLAGS,chan_sip)

 $(if $(filter chan_dahdi,$(EMBEDDED_MODS)),modules.link,chan_dahdi.so): sig_analog.o sig_pri.o sig_ss7.o

 sig_analog.o sig_pri.o sig_ss7.o: _ASTCFLAGS+=$(call MOD_ASTCFLAGS,chan_dahdi)

Asterisk-1.8.3.2/addons/sigcomp ->All sigcomp related files

Also link src folders of tinySIGCOMP and tinySAK

Files needed for SIGCOMP by asterisk

1. libtinySIGCOMP.a
2. libtinySAK.so.0.0.0

Asterisk Sigcomp Flow

__sip_xmit(Sends out packet)  ---------àCompression-àCompressed Packetàsipsock_read(Receives packets) àDecompression