Example of Android application managing media devices
This example can be used as streamer allowing to select source camera and microphone and specify parameters for the published video: FPS (Frames Per Second) and resolution (width, height).
Below that input field are located drop-down lists of available microphones and cameras and input fields for video parameters.
Two videos are played
- left - video from the camera
- right - the published video stream as received from the server
Switching renderer to play video stream from camera:
Work with code of the example
To analyze the code, let's take class MediaDevicesActivity.java of the media-devices example, which can be downloaded with corresponding build 1.0.1.70.
1. Initialization of the API.
Flashphoner.init() code
For initialization, object Сontext is passed to the init() method.
Flashphoner.init(this);
2. List available media devices.
Flashphoner.getMediaDevices(), MediaDeviceList.getAudioList(), MediaDeviceList.getVideoList() code
mMicSpinner = (LabelledSpinner) findViewById(R.id.microphone); mMicSpinner.setItemsArray(Flashphoner.getMediaDevices().getAudioList()); mMicLevel = (TextView) findViewById(R.id.microphone_level); mCameraSpinner = (LabelledSpinner) findViewById(R.id.camera); mCameraSpinner.setItemsArray(Flashphoner.getMediaDevices().getVideoList());
3. Video render management
FPSurfaceViewRenderer.setMirror() code
When a video is shown, an image is displayed to FPSurfaceViewRenderer objects:
- localRender to display video from camera
- remoteRender to display stream published preview
- newSurfaceRenderer to demonstrate renderer switching
For those objects, screen position, scaling type and mirroring should be set.
By default, mirror view is set to display video from camera by setMirror(true) method invokation. To display stream published preview and renderer switching object, mirroring is switched off by setMirror(false):
remoteRenderLayout.setPosition(0, 0, 100, 100);
remoteRender.setScalingType(RendererCommon.ScalingType.SCALE_ASPECT_FIT);
remoteRender.setMirror(false);
remoteRender.requestLayout();
localRenderLayout.setPosition(0, 0, 100, 100);
localRender.setScalingType(RendererCommon.ScalingType.SCALE_ASPECT_FIT);
localRender.setMirror(true);
localRender.requestLayout();
switchRenderLayout.setPosition(0, 0, 100, 100);
newSurfaceRenderer.setZOrderMediaOverlay(true);
newSurfaceRenderer.setScalingType(RendererCommon.ScalingType.SCALE_ASPECT_FIT);
newSurfaceRenderer.setMirror(true);
newSurfaceRenderer.requestLayout();
In this case, when you choose front camera, the image displayed from camera looks normally but is published mirror. When you choose back camera, image from camera looks mirror but is publihed in normal orientation (see application screenshots above).
4. Getting audio and video constraints set by user
AudioConstraints, VideoConstraints code
@NonNull
private Constraints getConstraints() {
AudioConstraints audioConstraints = null;
if (mSendAudio.isChecked()) {
audioConstraints = new AudioConstraints();
if (mUseFEC.isChecked()) {
audioConstraints.setUseFEC(true);
}
if (mUseStereo.isChecked()) {
audioConstraints.setUseStereo(true);
}
if (!mDefaultPublishAudioBitrate.isChecked() && mDefaultPublishAudioBitrate.getText().length() > 0) {
audioConstraints.setBitrate(Integer.parseInt(mPublishAudioBitrate.getText().toString()));
}
}
VideoConstraints videoConstraints = null;
if (mSendVideo.isChecked()) {
videoConstraints = new VideoConstraints();
videoConstraints.setCameraId(((MediaDevice) mCameraSpinner.getSpinner().getSelectedItem()).getId());
if (mCameraFPS.getText().length() > 0) {
videoConstraints.setVideoFps(Integer.parseInt(mCameraFPS.getText().toString()));
}
if (mWidth.getText().length() > 0 && mHeight.getText().length() > 0) {
videoConstraints.setResolution(Integer.parseInt(mWidth.getText().toString()),
Integer.parseInt(mHeight.getText().toString()));
}
if (!mDefaultPublishVideoBitrate.isChecked() && mPublishVideoBitrate.getText().length() > 0) {
videoConstraints.setBitrate(Integer.parseInt(mPublishVideoBitrate.getText().toString()));
}
}
return new Constraints(audioConstraints, videoConstraints);
}
5. Local camera and microphone testing
Flashphoner.getLocalMediaAccess() code
This parameters are passed:
- audio and video constarints set by user
- local object SurfaceViewRenderer localRenderer to display image from camera
case TEST_REQUEST_CODE: {
if (grantResults.length == 0 ||
grantResults[0] != PackageManager.PERMISSION_GRANTED ||
grantResults[1] != PackageManager.PERMISSION_GRANTED) {
Log.i(TAG, "Permission has been denied by user");
} else {
Flashphoner.getLocalMediaAccess(getConstraints(), localRender);
mTestButton.setText(R.string.action_release);
mTestButton.setTag(R.string.action_release);
mStartButton.setEnabled(false);
soundMeter = new SoundMeter();
soundMeter.start();
...
Log.i(TAG, "Permission has been granted by user");
}
break;
6. Session creation
Flashphoner.createSession() code
Object SessionOptions with the following parameters is passed to the createSession() method:
- URL of WCS server
- SurfaceViewRenderer, which will be used to display video from the camera
- SurfaceViewRenderer, which will be used to play the published video stream
SessionOptions sessionOptions = new SessionOptions(url); sessionOptions.setLocalRenderer(localRender); sessionOptions.setRemoteRenderer(remoteRender); /** * Session for connection to WCS server is created with method createSession(). */ session = Flashphoner.createSession(sessionOptions);
7. Connection to the server.
Session.connect(). code
session.connect(new Connection());
8. Receiving the event confirming successful connection.
session.onConnected() code
@Override
public void onConnected(final Connection connection) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mStartButton.setText(R.string.action_stop);
mStartButton.setTag(R.string.action_stop);
mStartButton.setEnabled(true);
mTestButton.setEnabled(false);
mStatusView.setText(connection.getStatus());;
...
}
});
}
9. Video stream creation
session.createStream() code
publishStream = session.createStream(streamOptions);
if (mMuteAudio.isChecked()) {
publishStream.muteAudio();
}
if (mMuteVideo.isChecked()) {
publishStream.muteVideo();
}
...
ActivityCompat.requestPermissions(MediaDevicesActivity.this,
new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.CAMERA},
PUBLISH_REQUEST_CODE);
10. Video stream publishing.
Stream.publish() code
case PUBLISH_REQUEST_CODE: {
if (grantResults.length == 0 ||
grantResults[0] != PackageManager.PERMISSION_GRANTED ||
grantResults[1] != PackageManager.PERMISSION_GRANTED) {
mStartButton.setEnabled(false);
mTestButton.setEnabled(false);
session.disconnect();
Log.i(TAG, "Permission has been denied by user");
} else {
/**
* Method Stream.publish() is called to publish stream.
*/
publishStream.publish();
Log.i(TAG, "Permission has been granted by user");
}
break;
}
11. Receiving the event confirming successful stream publishing
StreamStatusEvent PUBLISHING code
On receiving this event preview stream is created with Session.createStream() and Stream.play() is invoked to play it.
publishStream.on(new StreamStatusEvent() {
@Override
public void onStreamStatus(final Stream stream, final StreamStatus streamStatus) {
runOnUiThread(new Runnable() {
@Override
public void run() {
if (StreamStatus.PUBLISHING.equals(streamStatus)) {
/**
* The options for the stream to play are set.
* The stream name is passed when StreamOptions object is created.
*/
StreamOptions streamOptions = new StreamOptions(streamName);
streamOptions.setConstraints(new Constraints(mReceiveAudio.isChecked(), mReceiveVideo.isChecked()));
VideoConstraints videoConstraints = null;
if (mReceiveVideo.isChecked()) {
videoConstraints = new VideoConstraints();
...
}
AudioConstraints audioConstraints = null;
if (mReceiveAudio.isChecked()) {
audioConstraints = new AudioConstraints();
}
streamOptions.setConstraints(new Constraints(audioConstraints, videoConstraints));
String[] stripCodec = {(String) mStripPlayerCodec.getSpinner().getSelectedItem()};
streamOptions.setStripCodecs(stripCodec);
/**
* Stream is created with method Session.createStream().
*/
playStream = session.createStream(streamOptions);
...
/**
* Method Stream.play() is called to start playback of the stream.
*/
playStream.play();
if (mSendVideo.isChecked())
mSwitchCameraButton.setEnabled(true);
mSwitchRendererButton.setEnabled(true);
} else {
Log.e(TAG, "Can not publish stream " + stream.getName() + " " + streamStatus);
}
mStatusView.setText(streamStatus.toString());
}
});
}
});
12. Switching camera while publishing stream
Stream.switchCamera() code
mSwitchCameraButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (publishStream != null) {
mSwitchCameraButton.setEnabled(false);
publishStream.switchCamera(new CameraSwitchHandler() {
@Override
public void onCameraSwitchDone(boolean var1) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mSwitchCameraButton.setEnabled(true);
}
});
}
@Override
public void onCameraSwitchError(String var1) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mSwitchCameraButton.setEnabled(true);
}
});
}
});
}
}
});
13. Switching renderer object while publishing stream
Stream.switchRenderer() code
mSwitchRendererButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (spinner.getSelectedItemId() == 0){
if (isSwitchRemoteRenderer) {
playStream.switchRenderer(remoteRender);
isSwitchRemoteRenderer = false;
}
if (!isSwitchLocalRenderer) {
publishStream.switchRenderer(newSurfaceRenderer);
isSwitchLocalRenderer = true;
} else {
publishStream.switchRenderer(localRender);
isSwitchLocalRenderer = false;
}
} else {
if (isSwitchLocalRenderer) {
publishStream.switchRenderer(localRender);
isSwitchLocalRenderer = false;
}
if (!isSwitchRemoteRenderer) {
playStream.switchRenderer(newSurfaceRenderer);
isSwitchRemoteRenderer = true;
} else {
playStream.switchRenderer(remoteRender);
isSwitchRemoteRenderer = false;
}
}
}
});
14. Sound volume changing with hardware buttons
Flashphoner.setVolume() code
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
int currentVolume = Flashphoner.getVolume();
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
if (currentVolume == 1) {
Flashphoner.setVolume(0);
}
mPlayVolume.setProgress(currentVolume-1);
break;
case KeyEvent.KEYCODE_VOLUME_UP:
if (currentVolume == 0) {
Flashphoner.setVolume(1);
}
mPlayVolume.setProgress(currentVolume+1);
break;
}
return super.onKeyDown(keyCode, event);
}
15. Device speakerphone usage
Flashphoner.getAudioManager().isSpeakerphoneOn(), Flashphoner.getAudioManager().setUseSpeakerPhone() code
mSpeakerPhone = (CheckBox) findViewById(R.id.use_speakerphone);
mSpeakerPhone.setChecked(Flashphoner.getAudioManager().getAudioManager().isSpeakerphoneOn());
mSpeakerPhone.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Flashphoner.getAudioManager().setUseSpeakerPhone(isChecked);
}
});
16. Session disconnection.
Session.disconnect() code
mStartButton.setEnabled(false); /** * Connection to WCS server is closed with method Session.disconnect(). */ session.disconnect();
17. Receiving the event confirming successful disconnection
session.onDisconnection() code
@Override
public void onDisconnection(final Connection connection) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mStartButton.setText(R.string.action_start);
mStartButton.setTag(R.string.action_start);
mStartButton.setEnabled(true);
mSwitchCameraButton.setEnabled(false);
mSwitchRendererButton.setEnabled(false);
mStatusView.setText(connection.getStatus());
mTestButton.setEnabled(true);
}
});
}