feat: add AlphaFrameFilter

Author: lvpengwei

README.md

@@ -67,6 +67,9 @@ Custom filters can be created by inheriting [GlFilter.java](https://github.com/M
     ePlayerView.setGlFilter(new GlSepiaFilter());
 ```
 
+## AlphaVideo
+Use `AlphaFrameFilter` render video with alpha
+[how-to-create-an-alpha-video](https://felgo.com/doc/felgo-alphavideo/#how-to-create-an-alpha-video)
 
 ## Special Thanks to
 * [android-gpuimage](https://github.com/CyberAgent/android-gpuimage)

epf/src/main/java/com/daasuu/epf/EPlayerView.java

@@ -1,11 +1,13 @@
 package com.daasuu.epf;
 
 import android.content.Context;
+import android.graphics.PixelFormat;
 import android.opengl.GLSurfaceView;
 import android.util.AttributeSet;
 
 import com.daasuu.epf.chooser.EConfigChooser;
 import com.daasuu.epf.contextfactory.EContextFactory;
+import com.daasuu.epf.filter.AlphaFrameFilter;
 import com.daasuu.epf.filter.GlFilter;
 import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.video.VideoListener;
@@ -33,9 +35,12 @@ public EPlayerView(Context context, AttributeSet attrs) {
         setEGLContextFactory(new EContextFactory());
         setEGLConfigChooser(new EConfigChooser());
 
+        setZOrderOnTop(true);
+        setEGLConfigChooser(8, 8, 8, 8, 16, 0);
+        getHolder().setFormat(PixelFormat.RGBA_8888);
+
         renderer = new EPlayerRenderer(this);
         setRenderer(renderer);
-
     }
 
     public EPlayerView setSimpleExoPlayer(SimpleExoPlayer player) {
@@ -49,8 +54,23 @@ public EPlayerView setSimpleExoPlayer(SimpleExoPlayer player) {
         return this;
     }
 
+    private GlFilter filter = null;
     public void setGlFilter(GlFilter glFilter) {
         renderer.setGlFilter(glFilter);
+        if (glFilter != null) {
+            if (glFilter instanceof AlphaFrameFilter) {
+                videoAspect = videoAspect * 2;
+                requestLayout();
+            } else {
+                if (filter != null) {
+                    if (filter instanceof AlphaFrameFilter) {
+                        videoAspect = videoAspect / 2;
+                        requestLayout();
+                    }
+                }
+            }
+        }
+        filter = glFilter;
     }
 
     public void setPlayerScaleType(PlayerScaleType playerScaleType) {

epf/src/main/java/com/daasuu/epf/filter/AlphaFrameFilter.java

@@ -0,0 +1,28 @@
+package com.daasuu.epf.filter;
+
+public class AlphaFrameFilter extends GlFilter {
+    private static final String VERTEX_SHADER =
+            "attribute vec4 aPosition;\n" +
+                    "attribute vec4 aTextureCoord;\n" +
+                    "varying highp vec2 vTextureCoord;\n" +
+                    "varying highp vec2 vTextureCoord2;\n" +
+                    "void main() {\n" +
+                    "gl_Position = aPosition;\n" +
+                    "vTextureCoord = vec2(aTextureCoord.x, aTextureCoord.y*0.5+0.5);\n" +
+                    "vTextureCoord2 = vec2(aTextureCoord.x, aTextureCoord.y*0.5);\n" +
+                    "}\n";
+    private static final String FRAGMENT_SHADER =
+            "precision mediump float;\n" +
+                    "varying highp vec2 vTextureCoord;\n" +
+                    "varying highp vec2 vTextureCoord2;\n" +
+                    "uniform lowp sampler2D sTexture;\n" +
+                    "void main() {\n" +
+                    "vec4 color1 = texture2D(sTexture, vTextureCoord);\n" +
+                    "vec4 color2 = texture2D(sTexture, vTextureCoord2);\n" +
+                    "gl_FragColor = vec4(color1.rgb, color2.r);\n" +
+                    "}\n";
+
+    public AlphaFrameFilter() {
+        super(VERTEX_SHADER, FRAGMENT_SHADER);
+    }
+}

sample/src/main/assets/playdoh_bat.mp4

@@ -5,6 +5,7 @@
 import android.graphics.BitmapFactory;
 import android.util.Log;
 
+import com.daasuu.epf.filter.AlphaFrameFilter;
 import com.daasuu.epf.filter.GlBilateralFilter;
 import com.daasuu.epf.filter.GlBoxBlurFilter;
 import com.daasuu.epf.filter.GlBrightnessFilter;
@@ -58,6 +59,7 @@
 
 public enum FilterType {
     DEFAULT,
+    ALPHA_FRAME,
     BITMAP_OVERLAY_SAMPLE,
     BILATERAL_BLUR,
     BOX_BLUR,
@@ -98,8 +100,7 @@ public enum FilterType {
     WATERMARK,
     WEAK_PIXEL,
     WHITE_BALANCE,
-    ZOOM_BLUR,
-    ;
+    ZOOM_BLUR;
 
 
     public static List<FilterType> createFilterList() {
@@ -269,6 +270,8 @@ public static GlFilter createGlFilter(FilterType filterType, Context context) {
                 return new GlZoomBlurFilter();
             case BITMAP_OVERLAY_SAMPLE:
                 return new GlBitmapOverlaySample(BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_launcher_round));
+            case ALPHA_FRAME:
+                return new AlphaFrameFilter();
             default:
                 return new GlFilter();
         }

sample/src/main/java/com/daasuu/exoplayerfilter/FilterType.java

@@ -123,8 +123,9 @@ private void setUpSimpleExoPlayer() {
         DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "yourApplicationName"));
 
         // This is the MediaSource representing the media to be played.
-        MediaSource videoSource = new ProgressiveMediaSource.Factory(dataSourceFactory)
-                .createMediaSource(Uri.parse(Constant.STREAM_URL_MP4_VOD_LONG));
+//        MediaSource videoSource = new ProgressiveMediaSource.Factory(dataSourceFactory)
+//                .createMediaSource(Uri.parse(Constant.STREAM_URL_MP4_VOD_LONG));
+        MediaSource videoSource = new ProgressiveMediaSource.Factory(dataSourceFactory).createMediaSource(Uri.parse("asset:///playdoh_bat.mp4"));
 
         // SimpleExoPlayer
         player = ExoPlayerFactory.newSimpleInstance(this);

sample/src/main/java/com/daasuu/exoplayerfilter/MainActivity.java

@@ -25,10 +25,4 @@ public MovieWrapperView(@NonNull Context context, @Nullable AttributeSet attrs,
         super(context, attrs, defStyleAttr);
     }
 
-    @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        int measuredWidth = getMeasuredWidth();
-        setMeasuredDimension(measuredWidth, measuredWidth / 16 * 9);
-    }
 }

sample/src/main/java/com/daasuu/exoplayerfilter/MovieWrapperView.java

@@ -9,6 +9,7 @@
 
     <com.daasuu.exoplayerfilter.MovieWrapperView
         android:id="@+id/layout_movie_wrapper"
+        android:background="@color/colorPrimary"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />