本人正好有一個項目:在linux下開發softphone和frontdesk,支持g729流壓縮以提高語音通話質量。下面是staticlinking編譯處理的步驟。
1,下載IPP和IPP Samples並且按照說明安裝它們(這個步驟應該比較簡單)。
2,更改IPPSamples(_bin->binlibspeech.a->libusc.a)
mv./ipp-samples/speech-codecs/_bin./ipp-samples/speech-codecs/bin
mv ./ipp-samples/speech-codecs/bin/linux32_gcc4/lib/libspeech.a./ipp-samples/speech-codecs/bin/linux32_gcc4/lib/libusc.a
3,設置環境變量
export IPPROOT=/opt/intel/ipp/6.1.2.051/ia32
export IPPSAMPLES=/home/admin0/ipp-samples
4,修改pjsip的相應源代碼
4.1)在pjlib\include\pj\config_site.h 頭文件中添加IPP,g729支持:
#definePJMEDIA_HAS_INTEL_IPP
#definePJMEDIA_HAS_INTEL_IPP_CODEC_AMR 0
#definePJMEDIA_HAS_INTEL_IPP_CODEC_AMRWB 0
#definePJMEDIA_HAS_INTEL_IPP_CODEC_G729 1
#define PJMEDIA_HAS_INTEL_IPP_CODEC_G723_1 0
#definePJMEDIA_HAS_INTEL_IPP_CODEC_G726 0
#definePJMEDIA_HAS_INTEL_IPP_CODEC_G728 0
#define PJMEDIA_HAS_INTEL_IPP_CODEC_G722_1 0
#define PJMEDIA_AUTO_LINK_IPP_LIBS 0
以下步驟是基於項目實際情況的修改,你可能並不需要。
4.2)pjmedia\src\pjmedia-codec\ipp_codec.c 在頭文件 #include<usc.h>前添加
----------------
#if defined(_MSC_VER) &&PJMEDIA_AUTO_LINK_IPP_STATIC_LIBS
#include <ipp_w7.h>
#endif
---------------
"ipp_w7.h" 還有其他選項,根據操作系統,CPU類型選擇不同的頭文件
4.3)pjsip-apps\src\pjsua\pjsua_app.c
4.3.1) include ippcore.h to call initial static linking.
#include <ippcore.h>
4.3.2) Add
-------------
ippStaticInit();
-------------
before
for (i=0;i<PJ_ARRAY_SIZE(app_config.call_data); ++i) {
app_config.call_data[i].timer.id = PJSUA_INVALID_ID;
app_config.call_data[i].timer.cb =&call_timeout_callback;
}
4.3.3) set priority of g927
in app_init function.
------------------
define pj_str_t tmp;
-----------------
take out the original priority setting and replace by
--------------------
pjsua_codec_set_priority(pj_cstr(&tmp, "g729"),240);
pjsua_codec_set_priority(pj_cstr(&tmp, "gsm"),239);
pjsua_codec_set_priority(pj_cstr(&tmp, "pcma"),238);
pjsua_codec_set_priority(pj_cstr(&tmp, "pcmu"),237);
pjsua_codec_set_priority(pj_cstr(&tmp,"speex/8000"), 190);
pjsua_codec_set_priority(pj_cstr(&tmp, "ilbc"),189);
pjsua_codec_set_priority(pj_cstr(&tmp,"speex/16000"), 180);
pjsua_codec_set_priority(pj_cstr(&tmp,"speex/32000"), 0);
------------------
以上步驟是主要的pjsip修改。項目不同,修改的方式也不同
5,go to /pjsip-apps/build/Makefile
change $(CC_INC)../../pjmedia/include ->$(CC_INC)../../pjmedia/include \
and add one line $(CC_INC)/opt/intel/ipp/6.1.2.051/ia32/include\
6,cp user.mak.sample user.mak
# export CFLAGS += -Wno-unused-label -Werror
export LDFLAGS += -lippscmerged -lippsmerged-lippsrmerged
7,./configure --disable-oss --enable-ipp --with-ipp=$IPPROOT--with-ipp-samples=$IPPSAMPLES
--disable-oss選項是爲了解決Linux下音頻Device的衝突。
注:我在項目中用的是java調用pjsua,javax.sound.sampledAPI遇到了設備佔用的問題。這是JDK的一個bug,可能在JDK7中這個問題會得以解決。爲了避開JDK的這個問題,改用了openJDK6.
8,go to config.status
change
------------
s,@ac_build_mak_vars@,
export IPP_CFLAGS=-I/opt/intel/ipp/6.1.2.051/ia32/include-I/home/admin0/ipp-samples/speech-codecs/core/usc/include
export IPP_LDFLAGS=-L/opt/intel/ipp/6.1.2.051/ia32/sharedlib-L/home/admin0/ipp-samples/speech-codecs/bin/linux32_gcc4/lib
-------------
to
---------
s,@ac_build_mak_vars@, \
export IPP_CFLAGS=-I/opt/intel/ipp/6.1.2.051/ia32/include-I/home/admin0/ipp-samples/speech-codecs/core/usc/include \
export IPP_LDFLAGS=-L/opt/intel/ipp/6.1.2.051/ia32/lib-L/home/admin0/ipp-samples/speech-codecs/bin/linux32_gcc4/lib\
--------
9, ./config.status
10,build.mak
change
export IPP_LIBS=-lusc -lippsc -lipps -lippsr -lippcore-lguide
to
export IPP_LIBS=-lusc -lippscemerged -lippscmerged -lippsremerged-lippsrmerged -lippsemerged -lippsmerged -lippcore
注:IPP6的選項和5是不同的
11,make dep
12, make
通過以上步驟,可以在 pjsip-apps/bin的目錄下看到經過static linking的可執行文件pjsua.