processing/java/libraries/video/src/processing/video/Video.java at master · pif/processing · GitHub

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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

Part of the Processing project - http://processing.org

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General

Public License along with this library; if not, write to the

Free Software Foundation, Inc., 59 Temple Place, Suite 330,

Boston, MA 02111-1307 USA

package processing.video;

import org.gstreamer.*;

import processing.core.PApplet;

import processing.core.PConstants;

import java.io.File;

import java.util.List;

/**

* This class contains some basic functions used by the rest of the classes in

* this library.

public class Video implements PConstants {

// Path that the video library will use to load the GStreamer base libraries

// and plugins from. They can be passed from the application using the

// gstreamer.library.path and gstreamer.plugin.path system variables (see

// comments in initImpl() below).

protected static String gstreamerLibPath = "";

protected static String gstreamerPluginPath = "";

// Direct buffer pass enabled by default. With this mode enabled, no new

// buffers are created and disposed by the GC in each frame (thanks to Octavi

// Estape for suggesting this improvement) which should help performance in

// most situations.

protected static boolean passDirectBuffer = true;

// OpenGL texture used as buffer sink by default, when the renderer is

// GL-based. This can improve performance significantly, since the video

// frames are automatically copied into the texture without passing through

// the pixels arrays, as well as having the color conversion into RGBA handled

// natively by GStreamer.

protected static boolean useGLBufferSink = true;

protected static boolean defaultGLibContext = false;

protected static long INSTANCES_COUNT = 0;

protected static int bitsJVM;

static {

bitsJVM = PApplet.parseInt(System.getProperty("sun.arch.data.model"));

}

static protected void init() {

if (INSTANCES_COUNT == 0) {

initImpl();

}

INSTANCES_COUNT++;

}

static protected void restart() {

removePlugins();

Gst.deinit();

initImpl();

}

static protected void initImpl() {

// The location of the GStreamer base libraries can be passed from the

// application to the vide library via a system variable. In Eclipse, add to

// "VM Arguments" in "Run Configurations" the following line:

// -Dgstreamer.library.path=path

String libPath = System.getProperty("gstreamer.library.path");

if (libPath != null) {

gstreamerLibPath = libPath;

// If the GStreamer installation referred by gstreamer.library.path is not

// a system installation, then the path containing the plugins needs to be

// specified separately, otherwise the plugins will be automatically

// loaded from the default location. The system property for the plugin

// path is "gstreamer.plugin.path"

String pluginPath = System.getProperty("gstreamer.plugin.path");

if (pluginPath != null) {

gstreamerPluginPath = pluginPath;

}

} else {

// Paths are build automatically from the curren location of the video

// library.

if (PApplet.platform == LINUX) {

buildLinuxPaths();

} else if (PApplet.platform == WINDOWS) {

buildWindowsPaths();

} else if (PApplet.platform == MACOSX) {

buildMacOSXPaths();

}

if (!gstreamerLibPath.equals("")) {

System.setProperty("jna.library.path", gstreamerLibPath);

}

if (PApplet.platform == WINDOWS) {

LibraryLoader loader = LibraryLoader.getInstance();

if (loader == null) {

System.err.println("Cannot load local version of GStreamer libraries.");

}

String[] args = { "" };

Gst.setUseDefaultContext(defaultGLibContext);

Gst.init("Processing core video", args);

addPlugins();

}

static protected void addPlugins() {

if (!gstreamerPluginPath.equals("")) {

Registry reg = Registry.getDefault();

boolean res;

res = reg.scanPath(gstreamerPluginPath);

if (!res) {

System.err.println("Cannot load GStreamer plugins from " +

gstreamerPluginPath);

}

static protected void removePlugins() {

Registry reg = Registry.getDefault();

List<Plugin> list = reg.getPluginList();

for (Plugin plg : list) {

reg.removePlugin(plg);

}

static protected void buildLinuxPaths() {

gstreamerLibPath = "";

gstreamerPluginPath = "";

}

static protected void buildWindowsPaths() {

LibraryPath libPath = new LibraryPath();

String path = libPath.get();

gstreamerLibPath = buildGStreamerLibPath(path, "\\windows" + bitsJVM);

gstreamerPluginPath = gstreamerLibPath + "\\plugins";

}

static protected void buildMacOSXPaths() {

LibraryPath libPath = new LibraryPath();

String path = libPath.get();

gstreamerLibPath = buildGStreamerLibPath(path, "/macosx" + bitsJVM);

gstreamerPluginPath = gstreamerLibPath + "/plugins";

}

static protected String buildGStreamerLibPath(String base, String os) {

File path = new File(base + os);

if (path.exists()) {

return base + os;

} else {

return base;

}

static protected float nanoSecToSecFrac(float nanosec) {

for (int i = 0; i < 3; i++)

nanosec /= 1E3;

return nanosec;

}

static protected long secToNanoLong(float sec) {

Float f = new Float(sec * 1E9);

return f.longValue();

}

processing/java/libraries/video/src/processing/video/Video.java at master · pif/processing · GitHub

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