1 /*
2  * Copyright 2015 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 #ifndef FLOWGRAPH_MULTI_TO_MONO_CONVERTER_H
18 #define FLOWGRAPH_MULTI_TO_MONO_CONVERTER_H
19 
20 #include <unistd.h>
21 #include <sys/types.h>
22 
23 #include "FlowGraphNode.h"
24 
25 namespace FLOWGRAPH_OUTER_NAMESPACE {
26 namespace flowgraph {
27 
28 /**
29  * Convert a multi-channel interleaved stream to a monophonic stream
30  * by extracting channel[0].
31  */
32     class MultiToMonoConverter : public FlowGraphNode {
33     public:
34         explicit MultiToMonoConverter(int32_t inputChannelCount);
35 
36         virtual ~MultiToMonoConverter();
37 
38         int32_t onProcess(int32_t numFrames) override;
39 
getName()40         const char *getName() override {
41             return "MultiToMonoConverter";
42         }
43 
44         FlowGraphPortFloatInput input;
45         FlowGraphPortFloatOutput output;
46     };
47 
48 } /* namespace flowgraph */
49 } /* namespace FLOWGRAPH_OUTER_NAMESPACE */
50 
51 #endif //FLOWGRAPH_MULTI_TO_MONO_CONVERTER_H
52