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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.graphics;
/**
* Captures frames from an image stream as an OpenGL ES texture.
*
* <p>The image stream may come from either video playback or camera preview. A SurfaceTexture may
* be used in place of a SurfaceHolder when specifying the output destination of a MediaPlayer or
* Camera object. This will cause all the frames from that image stream to be sent to the
* SurfaceTexture object rather than to the device's display. When {@link #updateTexImage} is
* called, the contents of the texture object specified when the SurfaceTexture was created is
* updated to contain the most recent image from the image stream. This may cause some frames of
* the stream to be skipped.
*
* <p>The texture object uses the GL_TEXTURE_EXTERNAL_OES texture target, which is defined by the
* OES_EGL_image_external OpenGL ES extension. This limits how the texture may be used.
*/
public class SurfaceTexture {
@SuppressWarnings("unused")
private int mSurfaceTexture;
/**
* Callback interface for being notified that a new stream frame is available.
*/
public interface OnFrameAvailableListener {
void onFrameAvailable(SurfaceTexture surfaceTexture);
}
/**
* Exception thrown when a surface couldn't be created or resized
*/
public static class OutOfResourcesException extends Exception {
public OutOfResourcesException() {
}
public OutOfResourcesException(String name) {
super(name);
}
}
/**
* Construct a new SurfaceTexture to stream images to a given OpenGL texture.
*
* @param texName the OpenGL texture object name (e.g. generated via glGenTextures)
*/
public SurfaceTexture(int texName) {
init(texName);
}
/**
* Register a callback to be invoked when a new image frame becomes available to the
* SurfaceTexture. Note that this callback may be called on an arbitrary thread, so it is not
* safe to call {@link #updateTexImage} without first binding the OpenGL ES context to the
* thread invoking the callback.
*/
public void setOnFrameAvailableListener(OnFrameAvailableListener l) {
// TODO: Implement this!
}
/**
* Update the texture image to the most recent frame from the image stream. This may only be
* called while the OpenGL ES context that owns the texture is bound to the thread. It will
* implicitly bind its texture to the GL_TEXTURE_EXTERNAL_OES texture target.
*/
public native void updateTexImage();
private native void init(int texName);
/*
* We use a class initializer to allow the native code to cache some
* field offsets.
*/
private static native void nativeClassInit();
static { nativeClassInit(); }
}
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