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      1 /*
      2  * libjingle
      3  * Copyright 2013, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 package org.webrtc;
     29 
     30 import java.nio.ByteBuffer;
     31 import java.util.Arrays;
     32 
     33 /**
     34  * Java version of VideoRendererInterface.  In addition to allowing clients to
     35  * define their own rendering behavior (by passing in a Callbacks object), this
     36  * class also provides a createGui() method for creating a GUI-rendering window
     37  * on various platforms.
     38  */
     39 public class VideoRenderer {
     40 
     41   /** Java version of cricket::VideoFrame. */
     42   public static class I420Frame {
     43     public final int width;
     44     public final int height;
     45     public final int[] yuvStrides;
     46     public final ByteBuffer[] yuvPlanes;
     47 
     48     /**
     49      * Construct a frame of the given dimensions with the specified planar
     50      * data.  If |yuvPlanes| is null, new planes of the appropriate sizes are
     51      * allocated.
     52      */
     53     public I420Frame(
     54         int width, int height, int[] yuvStrides, ByteBuffer[] yuvPlanes) {
     55       this.width = width;
     56       this.height = height;
     57       this.yuvStrides = yuvStrides;
     58       if (yuvPlanes == null) {
     59         yuvPlanes = new ByteBuffer[3];
     60         yuvPlanes[0] = ByteBuffer.allocateDirect(yuvStrides[0] * height);
     61         yuvPlanes[1] = ByteBuffer.allocateDirect(yuvStrides[1] * height);
     62         yuvPlanes[2] = ByteBuffer.allocateDirect(yuvStrides[2] * height);
     63       }
     64       this.yuvPlanes = yuvPlanes;
     65     }
     66 
     67     /**
     68      * Copy the planes out of |source| into |this| and return |this|.  Calling
     69      * this with mismatched frame dimensions is a programming error and will
     70      * likely crash.
     71      */
     72     public I420Frame copyFrom(I420Frame source) {
     73       if (!Arrays.equals(yuvStrides, source.yuvStrides) ||
     74           width != source.width || height != source.height) {
     75         throw new RuntimeException("Mismatched dimensions!  Source: " +
     76             source.toString() + ", destination: " + toString());
     77       }
     78       copyPlane(source.yuvPlanes[0], yuvPlanes[0]);
     79       copyPlane(source.yuvPlanes[1], yuvPlanes[1]);
     80       copyPlane(source.yuvPlanes[2], yuvPlanes[2]);
     81       return this;
     82     }
     83 
     84     @Override
     85     public String toString() {
     86       return width + "x" + height + ":" + yuvStrides[0] + ":" + yuvStrides[1] +
     87           ":" + yuvStrides[2];
     88     }
     89 
     90     // Copy the bytes out of |src| and into |dst|, ignoring and overwriting
     91     // positon & limit in both buffers.
     92     private void copyPlane(ByteBuffer src, ByteBuffer dst) {
     93       src.position(0).limit(src.capacity());
     94       dst.put(src);
     95       dst.position(0).limit(dst.capacity());
     96     }
     97 }
     98 
     99   /** The real meat of VideoRendererInterface. */
    100   public static interface Callbacks {
    101     public void setSize(int width, int height);
    102     public void renderFrame(I420Frame frame);
    103   }
    104 
    105   // |this| either wraps a native (GUI) renderer or a client-supplied Callbacks
    106   // (Java) implementation; so exactly one of these will be non-0/null.
    107   final long nativeVideoRenderer;
    108   private final Callbacks callbacks;
    109 
    110   public static VideoRenderer createGui(int x, int y) {
    111     long nativeVideoRenderer = nativeCreateGuiVideoRenderer(x, y);
    112     if (nativeVideoRenderer == 0) {
    113       return null;
    114     }
    115     return new VideoRenderer(nativeVideoRenderer);
    116   }
    117 
    118   public VideoRenderer(Callbacks callbacks) {
    119     nativeVideoRenderer = nativeWrapVideoRenderer(callbacks);
    120     this.callbacks = callbacks;
    121   }
    122 
    123   private VideoRenderer(long nativeVideoRenderer) {
    124     this.nativeVideoRenderer = nativeVideoRenderer;
    125     callbacks = null;
    126   }
    127 
    128   public void dispose() {
    129     free(nativeVideoRenderer);
    130   }
    131 
    132   private static native long nativeCreateGuiVideoRenderer(int x, int y);
    133   private static native long nativeWrapVideoRenderer(Callbacks callbacks);
    134 
    135   private static native void free(long nativeVideoRenderer);
    136 }
    137