Home | History | Annotate | Download | only in effects 
      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.media.effect.effects;
     18 
     19 import android.filterfw.core.Filter;
     20 import android.filterfw.core.OneShotScheduler;
     21 import android.media.effect.EffectContext;
     22 import android.media.effect.FilterGraphEffect;
     23 import android.media.effect.EffectUpdateListener;
     24 
     25 import android.filterpacks.videoproc.BackDropperFilter;
     26 import android.filterpacks.videoproc.BackDropperFilter.LearningDoneListener;
     27 
     28 /**
     29  * Background replacement Effect.
     30  *
     31  * Replaces the background of the input video stream with a selected video
     32  * Learns the background when it first starts up;
     33  * needs unobstructed view of background when this happens.
     34  *
     35  * Effect parameters:
     36  *   source: A URI for the background video
     37  * Listener: Called when learning period is complete
     38  *
     39  * @hide
     40  */
     41 public class BackDropperEffect extends FilterGraphEffect {
     42     private static final String mGraphDefinition =
     43             "@import android.filterpacks.base;\n" +
     44             "@import android.filterpacks.videoproc;\n" +
     45             "@import android.filterpacks.videosrc;\n" +
     46             "\n" +
     47             "@filter GLTextureSource foreground {\n" +
     48             "  texId = 0;\n" + // Will be set by base class
     49             "  width = 0;\n" +
     50             "  height = 0;\n" +
     51             "  repeatFrame = true;\n" +
     52             "}\n" +
     53             "\n" +
     54             "@filter MediaSource background {\n" +
     55             "  sourceUrl = \"no_file_specified\";\n" +
     56             "  waitForNewFrame = false;\n" +
     57             "  sourceIsUrl = true;\n" +
     58             "}\n" +
     59             "\n" +
     60             "@filter BackDropperFilter replacer {\n" +
     61             "  autowbToggle = 1;\n" +
     62             "}\n" +
     63             "\n" +
     64             "@filter GLTextureTarget output {\n" +
     65             "  texId = 0;\n" +
     66             "}\n" +
     67             "\n" +
     68             "@connect foreground[frame]  => replacer[video];\n" +
     69             "@connect background[video]  => replacer[background];\n" +
     70             "@connect replacer[video]    => output[frame];\n";
     71 
     72     private EffectUpdateListener mEffectListener = null;
     73 
     74     private LearningDoneListener mLearningListener = new LearningDoneListener() {
     75         public void onLearningDone(BackDropperFilter filter) {
     76             if (mEffectListener != null) {
     77                 mEffectListener.onEffectUpdated(BackDropperEffect.this, null);
     78             }
     79         }
     80     };
     81 
     82     public BackDropperEffect(EffectContext context, String name) {
     83         super(context, name, mGraphDefinition, "foreground", "output", OneShotScheduler.class);
     84 
     85         Filter replacer = mGraph.getFilter("replacer");
     86         replacer.setInputValue("learningDoneListener", mLearningListener);
     87     }
     88 
     89     @Override
     90     public void setParameter(String parameterKey, Object value) {
     91         if (parameterKey.equals("source")) {
     92             Filter background = mGraph.getFilter("background");
     93             background.setInputValue("sourceUrl", value);
     94         } else if (parameterKey.equals("context")) {
     95             Filter background = mGraph.getFilter("background");
     96             background.setInputValue("context", value);
     97         }
     98     }
     99 
    100     @Override
    101     public void setUpdateListener(EffectUpdateListener listener) {
    102         mEffectListener = listener;
    103     }
    104 
    105 }