1 // Copyright 2012 Google Inc. All Rights Reserved. 2 3 package androidx.media.filterpacks.base; 4 5 import androidx.media.filterfw.Filter; 6 import androidx.media.filterfw.Frame; 7 import androidx.media.filterfw.FrameType; 8 import androidx.media.filterfw.MffContext; 9 import androidx.media.filterfw.Signature; 10 11 public class GraphInputSource extends Filter { 12 13 private Frame mFrame = null; 14 15 public GraphInputSource(MffContext context, String name) { 16 super(context, name); 17 } 18 19 @Override 20 public Signature getSignature() { 21 return new Signature() 22 .addOutputPort("frame", Signature.PORT_REQUIRED, FrameType.any()) 23 .disallowOtherInputs(); 24 } 25 26 public void pushFrame(Frame frame) { 27 if (mFrame != null) { 28 mFrame.release(); 29 } 30 if (frame == null) { 31 throw new RuntimeException("Attempting to assign null-frame!"); 32 } 33 mFrame = frame.retain(); 34 } 35 36 @Override 37 protected void onProcess() { 38 if (mFrame != null) { 39 getConnectedOutputPort("frame").pushFrame(mFrame); 40 mFrame.release(); 41 mFrame = null; 42 } 43 } 44 45 @Override 46 protected void onTearDown() { 47 if (mFrame != null) { 48 mFrame.release(); 49 mFrame = null; 50 } 51 } 52 53 @Override 54 protected boolean canSchedule() { 55 return super.canSchedule() && mFrame != null; 56 } 57 58 } 59
