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
17package androidx.media.filterpacks.base;
18
19import androidx.media.filterfw.*;
20
21public final class FrameSlotSource extends SlotFilter {
22
23    public FrameSlotSource(MffContext context, String name, String slotName) {
24        super(context, name, slotName);
25    }
26
27    @Override
28    public Signature getSignature() {
29        // TODO: It would be nice if we could return the slot type here. Not currently possible
30        // as getSignature() is typically called before a FrameManager and its slots are setup.
31        return new Signature()
32            .addOutputPort("frame", Signature.PORT_REQUIRED, FrameType.any())
33            .disallowOtherPorts();
34    }
35
36    @Override
37    protected boolean canSchedule() {
38        return super.canSchedule() && slotHasFrame();
39    }
40
41    @Override
42    protected void onProcess() {
43        Frame frame = getFrameManager().fetchFrame(mSlotName);
44        getConnectedOutputPort("frame").pushFrame(frame);
45        frame.release();
46    }
47
48}
49
50