Android平台编译Pjsip

1. 下载并解压最新的代码pjproject-2.10.tar.gz；

2. 设置编译NDK路径，例如：

export ANDROID_NDK_ROOT=/Users/everglow/Library/Android/sdk/ndk/21.0.6113669

3. 创建config_site.h并放到路径pjlib/include/pj/下

#define PJ_CONFIG_ANDROID 1

#include 

4. 编辑pjlib/include/pj/config.h文件：

diff -Naur pjproject-2.10~/pjlib/include/pj/config.h pjproject-2.10/pjlib/include/pj/config.h
--- pjproject-2.10~/pjlib/include/pj/config.h	2020-02-14 17:48:27.000000000 +0800
+++ pjproject-2.10/pjlib/include/pj/config.h	2020-02-26 16:17:08.391915999 +0800
@@ -255,15 +255,17 @@
 #   define PJ_IS_LITTLE_ENDIAN	0
 #   define PJ_IS_BIG_ENDIAN	1
 
-#elif defined(ARM) || defined(_ARM_) ||  defined(__arm__) || defined(_M_ARM)
+#elif defined(ARM) || defined(_ARM_) ||  defined(__arm__) || defined(_M_ARM) || defined(__aarch64__)
 #   define PJ_HAS_PENTIUM	0
+#   define PJ_IS_LITTLE_ENDIAN  1
+#   define PJ_IS_BIG_ENDIAN     0
     /*
      * ARM, bi-endian, so raise error if endianness is not configured
      */
 #   if !PJ_IS_LITTLE_ENDIAN && !PJ_IS_BIG_ENDIAN
 #   	error Endianness must be declared for this processor
 #   endif
-#   if defined (PJ_M_ARMV7) || defined(ARMV7)
+#   if defined (PJ_M_ARMV7) || defined(ARMV7) || defined(__aarch64__)
 #	undef PJ_M_ARMV7
 #	define PJ_M_ARM7		1
 #	define PJ_M_NAME		"armv7"

5. make configuration，这里需要指定sdk版本和支持的abi（'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'），例如：

APP_PLATFORM=android-23 TARGET_ABI=arm64-v8a ./configure-android --use-ndk-cflags --enable-static --disable-resample --disable-sound --disable-video --disable-small-filter --disable-large-filter --disable-speex-aec --disable-g711-codec --disable-l16-codec --disable-gsm-codec --disable-g722-codec --disable-g7221-codec --disable-speex-codec --disable-ilbc-codec --disable-sdl --disable-ffmpeg --disable-v4l2 --disable-openh264 

6. make pjsip

make dep && make -j$(nproc)

7. 输出编译后的文件：

mkdir out
make install DESTDIR=$(pwd)/out
cd ./out/usr/local/lib
for i in *.a; do mv "$i" "${i//-aarch64-unknown-linux-android}"; done

8. 在路径./out/usr/local/include中的头文件和./out/usr/local/lib/*.a静态库文件就是我们针对安卓特定abi编译出来的pj版本。

9. 引入项目中：

（1）将include的头文件放到main/jni/include/pj-2.10/下；

（2）将不同abi版本的静态库文件放到main/jni/lib/${abiType} 下（abiType是'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'）；

（3）修改Android.mk文件，按需链接对应的静态库文件，引入头文件：

PJSIP_VER=2.10

LOCAL_CFLAGS := \
	-DMG_WEBSOCKET_PING_INTERVAL_SECONDS=11 \
	-DMG_ENABLE_HTTP=1 \
	-DMG_ENABLE_HTTP_WEBSOCKET=1 \
	-DMG_ENABLE_BROADCAST=1 \
	-DMG_ENABLE_SSL=1 \
	-DPJ_DEBUG=1 \
	-DPJ_IS_BIG_ENDIAN=0 \
	-DPJ_IS_LITTLE_ENDIAN=1 \
	-DPJ_HAS_PENTIUM=0 \
	-DLTUN_LIB \
	-DZLOG \
	-I$(LOCAL_PATH)/include \
	-I$(LOCAL_PATH)/include/pj-$(PJSIP_VER) \    <-- 引入头文件
	-I$(LOCAL_PATH)/cJSON \
	-I$(LOCAL_PATH)/uthash/src \
	-I$(LOCAL_PATH)/libzlog/src \
	-I$(LOCAL_PATH)/libltun \
	-I$(LOCAL_PATH)/libev \
	-I$(LOCAL_PATH)/mongoose \
	-I$(LOCAL_PATH)/libp2p \
	-I$(LOCAL_PATH)/include/openssl -g

LOCAL_LDFLAGS += \
	$(LOCAL_PATH)/lib/$(TARGET_ARCH_ABI)/pj-$(PJSIP_VER)/libpjnath.a \
	$(LOCAL_PATH)/lib/$(TARGET_ARCH_ABI)/pj-$(PJSIP_VER)/libpjlib-util.a \
	$(LOCAL_PATH)/lib/$(TARGET_ARCH_ABI)/pj-$(PJSIP_VER)/libpj.a \