6714efc5e0
This class exposes to Java the application-side interface to the SurfaceTexture C++ class. Change-Id: I0dba42aad90257c7adbde6fa362658c0717b70d0
91 lines
3.3 KiB
Java
91 lines
3.3 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics;
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/**
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* Captures frames from an image stream as an OpenGL ES texture.
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*
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* <p>The image stream may come from either video playback or camera preview. A SurfaceTexture may
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* be used in place of a SurfaceHolder when specifying the output destination of a MediaPlayer or
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* Camera object. This will cause all the frames from that image stream to be sent to the
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* SurfaceTexture object rather than to the device's display. When {@link #updateTexImage} is
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* called, the contents of the texture object specified when the SurfaceTexture was created is
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* updated to contain the most recent image from the image stream. This may cause some frames of
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* the stream to be skipped.
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*
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* <p>The texture object uses the GL_TEXTURE_EXTERNAL_OES texture target, which is defined by the
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* OES_EGL_image_external OpenGL ES extension. This limits how the texture may be used.
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*/
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public class SurfaceTexture {
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@SuppressWarnings("unused")
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private int mSurfaceTexture;
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/**
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* Callback interface for being notified that a new stream frame is available.
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*/
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public interface OnFrameAvailableListener {
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void onFrameAvailable(SurfaceTexture surfaceTexture);
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}
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/**
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* Exception thrown when a surface couldn't be created or resized
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*/
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public static class OutOfResourcesException extends Exception {
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public OutOfResourcesException() {
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}
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public OutOfResourcesException(String name) {
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super(name);
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}
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}
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/**
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* Construct a new SurfaceTexture to stream images to a given OpenGL texture.
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*
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* @param texName the OpenGL texture object name (e.g. generated via glGenTextures)
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*/
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public SurfaceTexture(int texName) {
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init(texName);
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}
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/**
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* Register a callback to be invoked when a new image frame becomes available to the
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* SurfaceTexture. Note that this callback may be called on an arbitrary thread, so it is not
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* safe to call {@link #updateTexImage} without first binding the OpenGL ES context to the
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* thread invoking the callback.
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*/
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public void setOnFrameAvailableListener(OnFrameAvailableListener l) {
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// TODO: Implement this!
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}
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/**
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* Update the texture image to the most recent frame from the image stream. This may only be
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* called while the OpenGL ES context that owns the texture is bound to the thread. It will
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* implicitly bind its texture to the GL_TEXTURE_EXTERNAL_OES texture target.
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*/
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public native void updateTexImage();
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private native void init(int texName);
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/*
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* We use a class initializer to allow the native code to cache some
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* field offsets.
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*/
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private static native void nativeClassInit();
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static { nativeClassInit(); }
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}
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