Mercurial > jmeCapture

     1 ======Capture Audio/Video to a File======

     2 

     3 <note>A/V recording is still in development.  It works for all of jMonkeyEngine's test cases. If you experience any problems or

     4 of something isn't clear, please let me know. -- bortreb</note>

     5 

     6 So you've made your cool new JMonkeyEngine3 game and you want to

     7 create a demo video to show off your hard work. Or maybe you want to

     8 make a cutscene for your game using the physics and characters in the

     9 game itself.  Screen capturing is the most straightforward way to do

    10 this, but it can slow down your game and produce low-quality video and

    11 audio as a result. A better way is to record video and audio directly

    12 from the game while it is running.

    13 

    14 <note tip>Combine this method with jMonkeyEngine's [[:jme3:advanced:Cinematics]] feature to record high-quality game trailers!</note>

    15 

    16 ===== Simple Way =====

    17 

    18 First off, if all you just want to record video at 30fps with no sound, then look

    19 no further then jMonkeyEngine3's build in ''VideoRecorderAppState''

    20 class.

    21 

    22 Add the following code to your ''simpleInitApp()'' method. 

    23 

    24 <code java>

    25 stateManager.attach(new VideoRecorderAppState()); //start recording

    26 </code>

    27 

    28 The game will run slow, but the recording will be in high-quality and

    29 normal speed. The video files will be stored in your user home

    30 directory, if you want to save to another file, specify it in the

    31 VideoRecorderAppState constructor. Recording starts when the state is

    32 attached and ends when the application quits or the state is detached.

    33 

    34 That's all!

    35 

    36 ===== Advanced Way =====

    37 

    38 If you want to record audio as well, record at different framerates,

    39 or record from multiple viewpoints at once, then there's a full

    40 solution for doing this already made for you here:

    41 

    42 http://www.aurellem.com/releases/jmeCapture-latest.zip

    43 

    44 http://www.aurellem.com/releases/jmeCapture-latest.tar.bz2

    45 

    46 Download the archive in your preferred format, extract,

    47 add the jars to your project, and you are ready to go.

    48 

    49 The javadoc is here:

    50 http://www.aurellem.com/jmeCapture/docs/

    51 

    52 To capture video and audio you use the

    53 ''com.aurellem.capture.Capture'' class, which has two methods,

    54 ''captureAudio()'' and ''captureVideo()'', and the

    55 ''com.aurellem.capture.IsoTimer'' class, which sets the audio and

    56 video framerate.

    57 

    58 The steps are as simple as:

    59 

    60 <code java>

    61 yourApp.setTimer(new IsoTimer(desiredFramesPerSecond));

    62 </code>

    63 

    64 This causes jMonkeyEngine to take as much time as it needs to fully

    65 calculate every frame of the video and audio.  You will see your game

    66 speed up and slow down depending on how computationally demanding your

    67 game is, but the final recorded audio and video will be perfectly

    68 sychronized and will run at exactly the fps which you specified.

    69 

    70 <code java>

    71 captureVideo(yourApp, targetVideoFile);

    72 captureAudio(yourApp, targetAudioFile);

    73 </code>

    74 

    75 These will cause the app to record audio and video when it is run.

    76 Audio and video will stop being recorded when the app stops. Your

    77 audio will be recorded as a 44,100 Hz linear PCM wav file, while the

    78 video will be recorded according to the following rules:

    79 

    80 1.) (Preferred) If you supply an empty directory as the file, then

    81 the video will be saved as a sequence of .png files, one file per

    82 frame.  The files start at 0000000.png and increment from there.

    83 You can then combine the frames into your preferred

    84 container/codec. If the directory is not empty, then writing

    85 video frames to it will fail, and nothing will be written.

    86     

    87 2.) If the filename ends in ".avi" then the frames will be encoded as

    88 a RAW stream inside an AVI 1.0 container.  The resulting file

    89 will be quite large and you will probably want to re-encode it to

    90 your preferred container/codec format.  Be advised that some

    91 video payers cannot process AVI with a RAW stream, and that AVI

    92 1.0 files generated by this method that exceed 2.0GB are invalid

    93 according to the AVI 1.0 spec (but many programs can still deal

    94 with them.)  Thanks to Werner Randelshofer for his excellent work

    95 which made the AVI file writer option possible.

    96  

    97 3.) Any non-directory file ending in anything other than ".avi" will

    98 be processed through Xuggle.  Xuggle provides the option to use

    99 many codecs/containers, but you will have to install it on your

   100 system yourself in order to use this option. Please visit

   101 http://www.xuggle.com/ to learn how to do this.

   102 

   103 Note that you will not hear any sound if you choose to record sound to

   104 a file.

   105 

   106 ==== Basic Example ====

   107 

   108 Here is a complete example showing how to capture both audio and video

   109 from one of jMonkeyEngine3's advanced demo applications.

   110 

   111 <code java>

   112 import java.io.File;

   113 import java.io.IOException;

   114 

   115 import jme3test.water.TestPostWater;

   116 

   117 import com.aurellem.capture.Capture;

   118 import com.aurellem.capture.IsoTimer;

   119 import com.jme3.app.SimpleApplication;

   120 

   121 

   122 /**

   123  * Demonstrates how to use basic Audio/Video capture with a

   124  * jMonkeyEngine application. You can use these techniques to make

   125  * high quality cutscenes or demo videos, even on very slow laptops.

   126  * 

   127  * @author Robert McIntyre

   128  */

   129 

   130 public class Basic {

   131 	

   132     public static void main(String[] ignore) throws IOException{

   133 	File video = File.createTempFile("JME-water-video", ".avi");

   134 	File audio = File.createTempFile("JME-water-audio", ".wav");

   135 		

   136 	SimpleApplication app = new TestPostWater();

   137 	app.setTimer(new IsoTimer(60));

   138 	app.setShowSettings(false);

   139 		

   140 	Capture.captureVideo(app, video);

   141 	Capture.captureAudio(app, audio);

   142 		

   143 	app.start();

   144 		

   145 	System.out.println(video.getCanonicalPath());

   146 	System.out.println(audio.getCanonicalPath());

   147     }

   148 }

   149 </code>

   150 

   151 ==== How it works ====

   152 

   153 A standard JME3 application that extends ''SimpleApplication'' or

   154 ''Application'' tries as hard as it can to keep in sync with

   155 //user-time//.  If a ball is rolling at 1 game-mile per game-hour in the

   156 game, and you wait for one user-hour as measured by the clock on your

   157 wall, then the ball should have traveled exactly one game-mile. In

   158 order to keep sync with the real world, the game throttles its physics

   159 engine and graphics display.  If the computations involved in running

   160 the game are too intense, then the game will first skip frames, then

   161 sacrifice physics accuracy.  If there are particuraly demanding

   162 computations, then you may only get 1 fps, and the ball may tunnel

   163 through the floor or obstacles due to inaccurate physics simulation,

   164 but after the end of one user-hour, that ball will have traveled one

   165 game-mile.

   166 

   167 When we're recording video, we don't care if the game-time syncs with

   168 user-time, but instead whether the time in the recorded video

   169 (video-time) syncs with user-time. To continue the analogy, if we

   170 recorded the ball rolling at 1 game-mile per game-hour and watched the

   171 video later, we would want to see 30 fps video of the ball rolling at

   172 1 video-mile per //user-hour//. It doesn't matter how much user-time it

   173 took to simulate that hour of game-time to make the high-quality

   174 recording.

   175 

   176 The IsoTimer ignores real-time and always reports that the same amount

   177 of time has passed every time it is called. That way, one can put code

   178 to write each video/audio frame to a file without worrying about that

   179 code itself slowing down the game to the point where the recording

   180 would be useless.

   181 

   182 

   183 ==== Advanced Example ==== 

   184 

   185 The package from aurellem.com was made for AI research and can do more

   186 than just record a single stream of audio and video. You can use it

   187 to:

   188 

   189 1.) Create multiple independent listeners that each hear the world

   190 from their own perspective.

   191 

   192 2.) Process the sound data in any way you wish.

   193 

   194 3.) Do the same for visual data.

   195 

   196 Here is a more advanced example, which can also be found along with

   197 other examples in the jmeCapture.jar file included in the

   198 distribution.

   199 

   200 <code java>

   201 package com.aurellem.capture.examples;

   202 

   203 import java.io.File;

   204 import java.io.FileNotFoundException;

   205 import java.io.IOException;

   206 import java.lang.reflect.Field;

   207 import java.nio.ByteBuffer;

   208 

   209 import javax.sound.sampled.AudioFormat;

   210 

   211 import org.tritonus.share.sampled.FloatSampleTools;

   212 

   213 import com.aurellem.capture.AurellemSystemDelegate;

   214 import com.aurellem.capture.Capture;

   215 import com.aurellem.capture.IsoTimer;

   216 import com.aurellem.capture.audio.CompositeSoundProcessor;

   217 import com.aurellem.capture.audio.MultiListener;

   218 import com.aurellem.capture.audio.SoundProcessor;

   219 import com.aurellem.capture.audio.WaveFileWriter;

   220 import com.jme3.app.SimpleApplication;

   221 import com.jme3.audio.AudioNode;

   222 import com.jme3.audio.Listener;

   223 import com.jme3.cinematic.MotionPath;

   224 import com.jme3.cinematic.events.AbstractCinematicEvent;

   225 import com.jme3.cinematic.events.MotionTrack;

   226 import com.jme3.material.Material;

   227 import com.jme3.math.ColorRGBA;

   228 import com.jme3.math.FastMath;

   229 import com.jme3.math.Quaternion;

   230 import com.jme3.math.Vector3f;

   231 import com.jme3.scene.Geometry;

   232 import com.jme3.scene.Node;

   233 import com.jme3.scene.shape.Box;

   234 import com.jme3.scene.shape.Sphere;

   235 import com.jme3.system.AppSettings;

   236 import com.jme3.system.JmeSystem;

   237 

   238 /**

   239  * 

   240  * Demonstrates advanced use of the audio capture and recording

   241  * features.  Multiple perspectives of the same scene are

   242  * simultaneously rendered to different sound files.

   243  * 

   244  * A key limitation of the way multiple listeners are implemented is

   245  * that only 3D positioning effects are realized for listeners other

   246  * than the main LWJGL listener.  This means that audio effects such

   247  * as environment settings will *not* be heard on any auxiliary

   248  * listeners, though sound attenuation will work correctly.

   249  * 

   250  * Multiple listeners as realized here might be used to make AI

   251  * entities that can each hear the world from their own perspective.

   252  * 

   253  * @author Robert McIntyre

   254  */

   255 

   256 public class Advanced extends SimpleApplication {

   257 

   258     /**

   259      * You will see three grey cubes, a blue sphere, and a path which

   260      * circles each cube.  The blue sphere is generating a constant

   261      * monotone sound as it moves along the track.  Each cube is

   262      * listening for sound; when a cube hears sound whose intensity is

   263      * greater than a certain threshold, it changes its color from

   264      * grey to green.

   265      * 

   266      *  Each cube is also saving whatever it hears to a file.  The

   267      *  scene from the perspective of the viewer is also saved to a

   268      *  video file.  When you listen to each of the sound files

   269      *  alongside the video, the sound will get louder when the sphere

   270      *  approaches the cube that generated that sound file.  This

   271      *  shows that each listener is hearing the world from its own

   272      *  perspective.

   273      * 

   274      */

   275     public static void main(String[] args) {

   276 	Advanced app = new Advanced();

   277 	AppSettings settings = new AppSettings(true);

   278 	settings.setAudioRenderer(AurellemSystemDelegate.SEND);

   279 	JmeSystem.setSystemDelegate(new AurellemSystemDelegate());

   280 	app.setSettings(settings);

   281 	app.setShowSettings(false);

   282 	app.setPauseOnLostFocus(false);

   283 		

   284 	try {

   285 	    Capture.captureVideo(app, File.createTempFile("advanced",".avi"));

   286 	    Capture.captureAudio(app, File.createTempFile("advanced", ".wav"));

   287 	}

   288 	catch (IOException e) {e.printStackTrace();}

   289 		

   290 	app.start();

   291     }

   292 

   293 	

   294     private Geometry bell;

   295     private Geometry ear1;

   296     private Geometry ear2;

   297     private Geometry ear3;

   298     private AudioNode music;

   299     private MotionTrack motionControl;

   300 		

   301     private Geometry makeEar(Node root, Vector3f position){

   302 	Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

   303 	Geometry ear = new Geometry("ear", new Box(1.0f, 1.0f, 1.0f));

   304 	ear.setLocalTranslation(position);

   305 	mat.setColor("Color", ColorRGBA.Green);

   306 	ear.setMaterial(mat);

   307 	root.attachChild(ear);

   308 	return ear;

   309     } 

   310 

   311     private Vector3f[] path = new Vector3f[]{

   312 	// loop 1

   313 	new Vector3f(0, 0, 0),

   314 	new Vector3f(0, 0, -10),

   315 	new Vector3f(-2, 0, -14),

   316 	new Vector3f(-6, 0, -20),

   317 	new Vector3f(0, 0, -26),

   318 	new Vector3f(6, 0, -20),

   319 	new Vector3f(0, 0, -14),

   320 	new Vector3f(-6, 0, -20),

   321 	new Vector3f(0, 0, -26),

   322 	new Vector3f(6, 0, -20),

   323 	// loop 2

   324 	new Vector3f(5, 0, -5),

   325 	new Vector3f(7, 0, 1.5f),

   326 	new Vector3f(14, 0, 2),

   327 	new Vector3f(20, 0, 6),

   328 	new Vector3f(26, 0, 0),

   329 	new Vector3f(20, 0, -6),

   330 	new Vector3f(14, 0, 0),

   331 	new Vector3f(20, 0, 6),

   332 	new Vector3f(26, 0, 0),

   333 	new Vector3f(20, 0, -6),

   334 	new Vector3f(14, 0, 0),

   335 	// loop 3

   336 	new Vector3f(8, 0, 7.5f),

   337 	new Vector3f(7, 0, 10.5f),

   338 	new Vector3f(6, 0, 20),

   339 	new Vector3f(0, 0, 26),

   340 	new Vector3f(-6, 0, 20),

   341 	new Vector3f(0, 0, 14),

   342 	new Vector3f(6, 0, 20),

   343 	new Vector3f(0, 0, 26),

   344 	new Vector3f(-6, 0, 20),

   345 	new Vector3f(0, 0, 14),

   346 	// begin ellipse

   347 	new Vector3f(16, 5, 20),

   348 	new Vector3f(0, 0, 26),

   349 	new Vector3f(-16, -10, 20),

   350 	new Vector3f(0, 0, 14),

   351 	new Vector3f(16, 20, 20),

   352 	new Vector3f(0, 0, 26),

   353 	new Vector3f(-10, -25, 10),

   354 	new Vector3f(-10, 0, 0),

   355 	// come at me!

   356 	new Vector3f(-28.00242f, 48.005623f, -34.648228f),

   357 	new Vector3f(0, 0 , -20),

   358     };

   359 

   360     private void createScene() {

   361 	Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

   362 	bell = new Geometry( "sound-emitter" , new Sphere(15,15,1));

   363 	mat.setColor("Color", ColorRGBA.Blue);

   364 	bell.setMaterial(mat);

   365 	rootNode.attachChild(bell);

   366 

   367 	ear1 = makeEar(rootNode, new Vector3f(0, 0 ,-20));

   368 	ear2 = makeEar(rootNode, new Vector3f(0, 0 ,20));

   369 	ear3 = makeEar(rootNode, new Vector3f(20, 0 ,0));

   370 

   371 	MotionPath track = new MotionPath();

   372 

   373 	for (Vector3f v : path){

   374 	    track.addWayPoint(v);

   375 	}

   376 	track.setCurveTension(0.80f);

   377 

   378 	motionControl = new MotionTrack(bell,track);

   379 		

   380 	// for now, use reflection to change the timer... 

   381 	// motionControl.setTimer(new IsoTimer(60));

   382 	try {

   383 	    Field timerField;

   384 	    timerField = AbstractCinematicEvent.class.getDeclaredField("timer");

   385 	    timerField.setAccessible(true);

   386 	    try {timerField.set(motionControl, new IsoTimer(60));} 

   387 	    catch (IllegalArgumentException e) {e.printStackTrace();} 

   388 	    catch (IllegalAccessException e) {e.printStackTrace();}

   389 	} 

   390 	catch (SecurityException e) {e.printStackTrace();} 

   391 	catch (NoSuchFieldException e) {e.printStackTrace();}

   392 		

   393 	motionControl.setDirectionType(MotionTrack.Direction.PathAndRotation);

   394 	motionControl.setRotation(new Quaternion().fromAngleNormalAxis(-FastMath.HALF_PI, Vector3f.UNIT_Y));

   395 	motionControl.setInitialDuration(20f);

   396 	motionControl.setSpeed(1f);

   397 

   398 	track.enableDebugShape(assetManager, rootNode);

   399 	positionCamera();

   400     }

   401 

   402 

   403     private void positionCamera(){

   404 	this.cam.setLocation(new Vector3f(-28.00242f, 48.005623f, -34.648228f));

   405 	this.cam.setRotation(new Quaternion(0.3359635f, 0.34280345f, -0.13281013f, 0.8671653f));

   406     }

   407 

   408     private void initAudio() {

   409 	org.lwjgl.input.Mouse.setGrabbed(false);	

   410 	music = new AudioNode(assetManager, "Sound/Effects/Beep.ogg", false);

   411 

   412 	rootNode.attachChild(music);

   413 	audioRenderer.playSource(music);

   414 	music.setPositional(true);

   415 	music.setVolume(1f);

   416 	music.setReverbEnabled(false);

   417 	music.setDirectional(false);

   418 	music.setMaxDistance(200.0f);

   419 	music.setRefDistance(1f);

   420 	//music.setRolloffFactor(1f);

   421 	music.setLooping(false);

   422 	audioRenderer.pauseSource(music); 

   423     }

   424 

   425     public class Dancer implements SoundProcessor {

   426 	Geometry entity;

   427 	float scale = 2;

   428 	public Dancer(Geometry entity){

   429 	    this.entity = entity;

   430 	}

   431 

   432 	/**

   433 	 * this method is irrelevant since there is no state to cleanup.

   434 	 */

   435 	public void cleanup() {}

   436 

   437 

   438 	/**

   439 	 * Respond to sound!  This is the brain of an AI entity that 

   440 	 * hears it's surroundings and reacts to them.

   441 	 */

   442 	public void process(ByteBuffer audioSamples, int numSamples, AudioFormat format) {

   443 	    audioSamples.clear();

   444 	    byte[] data = new byte[numSamples];

   445 	    float[] out = new float[numSamples];

   446 	    audioSamples.get(data);

   447 	    FloatSampleTools.byte2floatInterleaved(data, 0, out, 0, 

   448 						   numSamples/format.getFrameSize(), format);

   449 

   450 	    float max = Float.NEGATIVE_INFINITY;

   451 	    for (float f : out){if (f > max) max = f;}

   452 	    audioSamples.clear();

   453 

   454 	    if (max > 0.1){entity.getMaterial().setColor("Color", ColorRGBA.Green);}

   455 	    else {entity.getMaterial().setColor("Color", ColorRGBA.Gray);}

   456 	}

   457     }

   458 

   459     private void prepareEar(Geometry ear, int n){

   460 	if (this.audioRenderer instanceof MultiListener){

   461 	    MultiListener rf = (MultiListener)this.audioRenderer;

   462 

   463 	    Listener auxListener = new Listener();

   464 	    auxListener.setLocation(ear.getLocalTranslation());

   465 

   466 	    rf.addListener(auxListener);

   467 	    WaveFileWriter aux = null;

   468 

   469 	    try {aux = new WaveFileWriter(new File("/home/r/tmp/ear"+n+".wav"));} 

   470 	    catch (FileNotFoundException e) {e.printStackTrace();}

   471 

   472 	    rf.registerSoundProcessor(auxListener, 

   473 				      new CompositeSoundProcessor(new Dancer(ear), aux));

   474 	}   

   475     }

   476 

   477 

   478     public void simpleInitApp() {

   479 	this.setTimer(new IsoTimer(60));

   480 	initAudio();

   481 		

   482 	createScene();

   483 

   484 	prepareEar(ear1, 1);

   485 	prepareEar(ear2, 1);

   486 	prepareEar(ear3, 1);

   487 

   488 	motionControl.play();

   489     }

   490 

   491     public void simpleUpdate(float tpf) {

   492 	if (music.getStatus() != AudioNode.Status.Playing){

   493 	    music.play();

   494 	}

   495 	Vector3f loc = cam.getLocation();

   496 	Quaternion rot = cam.getRotation();

   497 	listener.setLocation(loc);

   498 	listener.setRotation(rot);

   499 	music.setLocalTranslation(bell.getLocalTranslation());

   500     }

   501 

   502 }

   503 </code>

   504 

   505 {{http://www.youtube.com/v/oCEfK0yhDrY?.swf?400×333}}

   506 

   507 ===== More Information =====

   508 

   509 This is the old page showing the first version of this idea

   510 http://aurellem.org/cortex/html/capture-video.html

   511 

   512 All source code can be found here:

   513 

   514 http://hg.bortreb.com/audio-send

   515 

   516 http://hg.bortreb.com/jmeCapture

   517  

   518 More information on the modifications to OpenAL to support multiple

   519 listeners can be found here.

   520 

   521 http://aurellem.org/audio-send/html/ear.html
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 28 Feb 2012 11:17:04 -0600
parents	76581e11fb72
children