Guide for Compiling PJSIP with OpenSSL,Ogg, and Opus for Android

Do you need a guide for compiling PJSIP with OpenSSL, Ogg, and Opus for Android? In the evolving landscape of Android development, particularly in the realm of Voice over Internet Protocol (VoIP), the PJSUA2 sample application emerges as a pivotal tool. However, this application is an integral part of the renowned PJSIP suite. It stands as a testament to advanced communication solutions in mobile applications. Hence, its significance is rooted in its ability to offer a seamless integration of high-quality voice and video call functionalities into Android apps, thereby revolutionizing the way we interact digitally. Moreover,PJSIP, an open-source multimedia communication library, stands as a cornerstone in the world of digital communications. Moreover, it is crafted meticulously in C language. It offers an extensive range of functionalities, encompassing audio and video communication, presence information, and instant messaging. Therefore, its robust library is not just a tool, but a gateway to building powerful, interactive, and real-time communication applications.

In this guide, we delve into the nuances of compiling PJSIP, a task integral to utilizing its full potential, especially in Android environments. Therefore, the focus will be on integrating PJSIP with OpenSSL, Ogg, and Opus, three pivotal components that elevate its capabilities.

Defining PJSIP,OpenSSL, Ogg, and Opus Components.

Before we dive deep into the topic of Compiling PJSIP with OpenSSL, Ogg, Opus for Android. It is necessary for us to first simply these components for the target audeince to enhance their understanding. Keep reading and Keep exploring!

OpenSSL:

It is renowned for its robust security features. Moreover, it also ensures that all communications facilitated by PJSIP and are encrypted and secure. This integration is crucial in an era where data security and privacy are paramount.

2. Ogg:

It is an open container format, lauded for its efficiency in handling streaming and manipulation of high-quality digital multimedia. Therefore, by incorporating Ogg, PJSIP stands equipped to manage a range of multimedia formats seamlessly. It also ensures versatility in communication applications.

3. Opus:

A versatile and open audio codec, is celebrated for its superior audio quality. Moreover, it is capable of handling a wide range of interactive audio applications, from VoIP to video conferencing. When integrated with PJSIP, Opus ensures that audio communication is not only clear and uninterrupted but also optimized for varying network conditions. Therefore, this integration is particularly significant in an era where clear and reliable audio communication forms the backbone of digital interactions.

Compiling Signal Library for Android: A Step-by-Step Guide

What are the Prerequisites Developers Need for Compiling PJSIP with OpenSSL,Ogg, and Opus for Android?

Before we begin explaining the main topic of the blog, Hence, ensure you have the following prerequisites:

Android NDK (Native Development Kit) installed on your system.
PJSIP source code downloaded. You can obtain it from the official website: PJSIP Download.
OpenSSL library: Download the OpenSSL library from OpenSSL Download.
Ogg library: Download the Ogg library from Ogg Library Download.
OPUS library: Download the OPUS library from the official OPUS website: OPUS Download.

Thus, after you have access to the above-mentioned tools with you. Let’s dive deep into the Step-By-Step Guide for Compiling PJSIP with OpenSSL,Ogg, and Opus for Android

5 Step-by-Step Guide for Compiling PJSIP with OpenSSL,Ogg, and Opus for Android

Here is the step-by-step guide you can use to compile PJSIP with OpenSSL,Ogg, and Opus for Android. Keep reading and Keep exploring the solution!

#1 Step: Create Project Structure Organize your project structure by creating directories for libraries and Java files. Ensure that the PJSIP source code is placed in a dedicated directory.

#Step 2: Build OpenSSL for Android

2.1 Build OpenSSL

Extract the OpenSSL source code to a directory.
Open a terminal and navigate to the OpenSSL source code directory.
Run the following commands to configure OpenSSL for Android (replace paths and Android API level as needed):

$ export ANDROID_NDK_ROOT=/path/to/android/ndk
$ export ANDROID_API=android-xx # Replace xx with your target Android API level
$ sudo ./Configure android-arm no-shared no-ssl2 no-ssl3 no-comp no-hw no-engine –prefix=/path/to/output/directory
$ sudo make
$ sudo make install

This will build OpenSSL for Android ARM architecture.

#Step 3: Build the Ogg Library for Android

3.1 Build Ogg Library

Extract the Ogg library source code to a directory.
Open a terminal and navigate to the Ogg library source code directory.
Run the following commands (adjust the paths accordingly):

$ export ANDROID_NDK_ROOT=/path/to/android/ndk
$ export ANDROID_API=android-xx # Replace xx with your target Android API level
$ sudo ./configure –host=arm-linux-androideabi –prefix=/path/to/output/directory
$ sudo make
$ sudo make install

This will build the Ogg library for Android ARM architecture.

#Step 4: Build the OPUS Library for Android

4.1 Build OPUS Library

Extract the OPUS library source code to a directory.
Open a terminal and navigate to the OPUS library source code directory.
Run the following commands (adjust the paths accordingly):

$ export ANDROID_NDK_ROOT=/path/to/android/ndk
$ export ANDROID_API=android-xx # Replace xx with your target Android API level
$ sudo ./configure –host=arm-linux-androideabi –prefix=/path/to/output/directory
$ sudo make
$ sudo make install

This will build the OPUS library for Android ARM architecture.

#Step 5: Configure PJSIP

5.1 Create config_site.h

Navigate to the PJSIP source code directory and create a config_site.h file with the necessary configuration options. Add the following content to config_site.h:

#define PJ_CONFIG_ANDROID 1
#include <pj/config_site_sample.h>
#define PJMEDIA_CODEC_L16_HAS_8KHZ_MONO 1
#define PJMEDIA_CODEC_L16_HAS_8KHZ_STEREO 1
#define PJMEDIA_CODEC_L16_HAS_16KHZ_MONO 1
#define PJMEDIA_CODEC_L16_HAS_16KHZ_STEREO 1
#define PJMEDIA_CODEC_L16_HAS_48KHZ_MONO 1
#define PJMEDIA_CODEC_L16_HAS_48KHZ_STEREO 1
#define PJMEDIA_HAS_OPUS_CODEC 1
#define PJ_HAS_SSL_SOCK 1

Customize these options according to your project requirements.

5.2 Run Configuration Script

Run the following command to configure PJSIP for Android, including SSL and Opus support.

Replace /path/to/openssl and /path/to/opus with the actual paths to your OpenSSL and Opus libraries:

$ sudo ./configure-android –use-ndk-cflags –with-ssl=/path/to/openssl –with-opus=/path/to/opus

5.3 Build Native Libraries

After configuring, use the following command to build the native libraries:

$ sudo make dep && make

This will build the PJSIP native libraries for Android.

Then. you will have to the next steps to use it in your Android app

Building and running pjsua2 sample application

A sample application using pjsua2 API with SWIG Java binding is located under pjsip-apps/src/swig/java/android. It is not built by default, and you need SWIG to build it.

Follow these steps to build pjsua2 sample application:

Make sure SWIG is in the build environment PATH.
Run make from directory pjsip-apps/src/swig (note that the Android NDK root should be in the PATH), e.g:

$ cd /path/to/your/pjsip/dir
$ cd pjsip-apps/src/swig
$ make
- Note
  If you are building for other targets ABI, you’ll need to manually move libpjsua2.so to the appropriate target ABI directory, e.g: jniLibs/armeabi-v7a, please check here for target ABI directory names.

pjsua2 Java interface (a lot of .java files) in pjsip-apps/src/swig/java/android/app/src/main/java/org/pjsip/pjsua2
Make sure any library dependencies are copied to pjsip-apps/src/swig/java/android/app/src/main/jniLibs/armeabi (or the appropriate target ABI directory), e.g: libopenh264.so for video support.
Open pjsua2 app project in Android Studio, it is located in pjsip-apps/src/swig/java/android.
Run it.

Wrapping Up!

By following the above-mentioned steps, you can compile PJSIP with OpenSSL, Ogg, and Opus for Android. hence, It is important to ensure to adjust paths and configurations based on your specific project setup. Therefore, once you get successful in compiling PJSIP with OpenSSL, Ogg, and Opus for Android. Thus, it can integrate these libraries into your Android project to enable multimedia communication capabilities.