Recording sip calls in android with PJSUA

Question

I am developing a sip app with internal recording. I need the both side audios to be recorder internally in mobile itself.

Read several blogs and articles regarding the same. I know the only solution is using the NDK. After a great effort, I compiled and integrated pjsip/pjsua2 into my app with which client registrations and calls are working fine. But, could not record calls. I had tried pjsua's AudioMediaRecorder but since there in no proper documentation I did not understood anything.

@Override

public void onCallMediaState(OnCallMediaStateParam prm)

{

Log.i(TAG, "onCallMediaState: ");
CallInfo ci;
try {
    ci = getInfo();
} catch (Exception e) {
    return;
}

CallMediaInfoVector cmiv = ci.getMedia();
for (int i = 0; i < cmiv.size(); i++) {
    CallMediaInfo cmi = cmiv.get(i);
    if (cmi.getType() == pjmedia_type.PJMEDIA_TYPE_AUDIO && (cmi.getStatus() == pjsua_call_media_status.PJSUA_CALL_MEDIA_ACTIVE)) {
        try {

            am = getAudioMedia(i);
            audioMediaRecorder.createRecorder("callaudio.wav");
            am.startTransmit(audioMediaRecorder);

            MyApp.ep.audDevManager().getCaptureDevMedia().
                    startTransmit(am);
            am.startTransmit(MyApp.ep.audDevManager().
                    getPlaybackDevMedia());
        } catch (Exception e) {
            System.out.println("Failed connecting media ports" +
                    e.getMessage());
            continue;
        }
    }
}
MyApp.observer.notifyCallMediaState(this);

}

where is this myaudiofile.wav file saved? How can I get it?

above code produces a log like this -

pjsua_media.c ...Call 1: updating media..

pjsua_media.c .....Media stream call01:0 is destroyed

pjsua_aud.c ....Audio channel update..

strm0x953fe014 .....VAD temporarily disabled

strm0x953fe014 .....Encoder stream started

strm0x953fe014 .....Decoder stream started

pjsua_media.c ....Audio updated, stream #0: PCMA (sendrecv)

MyCall: onCallMediaState:

pjsua_aud.c ...Creating recorder myfilename.wav..

pjsua_aud.c ....Unable to open file for recording: Read-only file system [status=120030]

media.cpp ...pjsua_recorder_create(&pj_name, enc_type, NULL, -1, options, &recorderId) error: Read-only file system (status=120030) [../src/pjsua2/media.cpp:443]

Failed connecting media portsTitle: pjsua_recorder_create(&pj_name, enc_type, NULL, -1, options, &recorderId)

Code: 120030

Description: Read-only file system

Location: ../src/pjsua2/media.cpp:443 15:52:01.458
pjsua_core.c ....TX 940 bytes Response msg 200/INVITE/cseq=1 (tdta0x96976064) to UDP 218.248.233.142:5060:

Answer 1

You should specify an exact folder & file for where to save you recording, something like this.

 File root = Environment.getExternalStorageDirectory();

 // Specify a directory for your recordings
 File dir = new File(root.getAbsolutePath() + File.separator + "PJSIP-Recordings");

 // Ensure that the directory exists
 dir.mkdirs();

 audioMediaRecorder.createRecorder(dir.getAbsolutePath() + File.separator + "callaudio.wav"); 

This will be saved in the root folder under the folder PJSIP-Recordings (You can change this to whatever you want).

Also, make sure you request Storage Permissions.