1.Software
pjproject-2.5.1
http://www.pjsip.org/release/2.5.1/pjproject-2.5.1.tar.bz2
webrtc-audio-processing
https://www.freedesktop.org/software/pulseaudio/webrtc-audio-processing/#download
The "offical" WebRTC needs a lot of other tools to compile (No autoconf / Makefile) and makes everything difficult.
2.Environment
iMX6 / arm-cortex A9
Embedded Linux / buildroot
3.Compile webrtc-audio-processing
# cd webrtc-audio-processing
# ./autogen.sh
# CFLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -O2" CXXFLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -O2" CC=arm-buildroot-linux-gnueabi-gcc CXX=arm-buildroot-linux-gnueabi-g++ AR=arm-buildroot-linux-gnueabi-ar ./configure --host=arm-linux --target=arm-linux --prefix=/home/gigijoe/imx6sabre/sysroot --cache-file=/dev/null
# make
Copy ./webrtc/modules/audio_processing/.libs/libwebrtc_audio_processing.so.1.0.0 to your target
4.Compile PJSIP
Patch pjproject-2.5.1/aconfigure
##################################################
--- ./pjproject-2.5.1.original/aconfigure 2016-05-18 00:01:59.000000000 +0800
+++ pjproject-2.5.1/aconfigure 2016-07-05 21:27:12.514799348 +0800
@@ -7438,7 +7438,8 @@
if test "x$with_webrtc" != "xno" -a "x$with_webrtc" != "x"; then
WEBRTC_PREFIX=$with_webrtc
- WEBRTC_CFLAGS="-I$WEBRTC_PREFIX/src"
+ #WEBRTC_CFLAGS="-I$WEBRTC_PREFIX/src"
+ WEBRTC_CFLAGS="-I$WEBRTC_PREFIX"
case $target in
*-apple-darwin_ios*)
@@ -7453,8 +7454,10 @@
esac
;;
*mingw* | *cygw* | *win32* | *w32* | *darwin* | *linux* | *android*)
- WEBRTC_LDFLAGS="-L$WEBRTC_PREFIX/src/out/Release"
- WEBRTC_LIBS="-laudio_processing_sse2"
+ #WEBRTC_LDFLAGS="-L$WEBRTC_PREFIX/src/out/Release"
+ WEBRTC_LDFLAGS="-L$WEBRTC_PREFIX/webrtc/modules/audio_processing/.libs"
+ #WEBRTC_LIBS="-laudio_processing_sse2"
+ WEBRTC_LIBS="-lwebrtc_audio_processing"
;;
*)
;;
@@ -7467,7 +7470,7 @@
WEBRTC_LDFLAGS=""
fi
- WEBRTC_LIBS="$WEBRTC_LIBS -laudio_processing -lcommon_audio -lsystem_wrappers"
+ #WEBRTC_LIBS="$WEBRTC_LIBS -laudio_processing -lcommon_audio -lsystem_wrappers"
SAVED_LIBS="$LIBS"
SAVED_LDFLAGS="$LDFLAGS"
##################################################
# cd pjproject-2.5.1
# ac_cv_lib_audio_processing_WebRtcAec_Process=yes CC=arm-buildroot-linux-gnueabi-gcc CXX=arm-buildroot-linux-gnueabi-g++ AR=arm-buildroot-linux-gnueabi-ar ./configure --host=arm-linux --target=arm-linux --prefix=/home/gigijoe/imx6sabre/sysroot --with-webrtc=$PWD/../webrtc-audio-processing --cache-file=/dev/null
# make
Copy ./pjsip-apps/bin/pjsua-arm-unknown-linux-gnu to your target
5.Running and test
pjsua-arm-unknown-linux-gnu --ec-opt=3 --ec-tail=30
Then make a call to test
6.AEC performance
This is the best result of echo cancellation among open source AEC I have ever tested.
Very close to commerical product.
By enabling NEON hardware floating, the CUP usage while talking (G.711 uLaw) is around 2% ~ 20%
