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_CHANNEL_COUNT_CONVERTER_H
18 #define FLOWGRAPH_CHANNEL_COUNT_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  * Change the number of number of channels without mixing.
30  * When increasing the channel count, duplicate input channels.
31  * When decreasing the channel count, drop input channels.
32  */
33     class ChannelCountConverter : public FlowGraphNode {
34     public:
35         explicit ChannelCountConverter(
36                 int32_t inputChannelCount,
37                 int32_t outputChannelCount);
38 
39         virtual ~ChannelCountConverter();
40 
41         int32_t onProcess(int32_t numFrames) override;
42 
getName()43         const char *getName() override {
44             return "ChannelCountConverter";
45         }
46 
47         FlowGraphPortFloatInput input;
48         FlowGraphPortFloatOutput output;
49     };
50 
51 } /* namespace flowgraph */
52 } /* namespace FLOWGRAPH_OUTER_NAMESPACE */
53 
54 #endif //FLOWGRAPH_CHANNEL_COUNT_CONVERTER_H
55