| // Copyright 2015 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef COBALT_AUDIO_AUDIO_NODE_INPUT_H_ |
| #define COBALT_AUDIO_AUDIO_NODE_INPUT_H_ |
| |
| #include <set> |
| #include <vector> |
| |
| #include "base/memory/ref_counted.h" |
| #include "cobalt/audio/audio_buffer.h" |
| #include "media/base/shell_audio_bus.h" |
| |
| namespace cobalt { |
| namespace audio { |
| |
| class AudioNode; |
| class AudioNodeOutput; |
| |
| // This represents the input feeding into the AudioNode. |
| // It may be connected to one or more AudioNodeOutputs. |
| // A connection to the input means connecting an output of an AudioNode |
| // (AudioNodeOutput) to an input of an AudioNode (AudioNodeInput). |
| // Each AudioNodeInput has a specific number of channels at any given time. This |
| // number can change depending on the connection(s) made to the input. If the |
| // input has no connections, then it has one channel which is silent. |
| class AudioNodeInput : public base::RefCountedThreadSafe<AudioNodeInput> { |
| typedef ::media::ShellAudioBus ShellAudioBus; |
| |
| public: |
| explicit AudioNodeInput(AudioNode* owner_node) : owner_node_(owner_node) {} |
| ~AudioNodeInput(); |
| |
| void Connect(AudioNodeOutput* output); |
| void Disconnect(AudioNodeOutput* output); |
| |
| void DisconnectAll(); |
| |
| // For each input, an AudioNode performs a mixing of all connections to that |
| // input. FillAudioBus() performs that action. In the case of multiple |
| // connections, it sums the result into |audio_bus|. |
| void FillAudioBus(ShellAudioBus* audio_bus, bool* silence); |
| |
| private: |
| AudioNode* const owner_node_; |
| std::set<AudioNodeOutput*> outputs_; |
| }; |
| |
| } // namespace audio |
| } // namespace cobalt |
| |
| #endif // COBALT_AUDIO_AUDIO_NODE_INPUT_H_ |