AudioInputProcessorObserverInterface.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file 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 ALEXA_CLIENT_SDK_AVSCOMMON_SDKINTERFACES_INCLUDE_AVSCOMMON_SDKINTERFACES_AUDIOINPUTPROCESSOROBSERVERINTERFACE_H_
#define ALEXA_CLIENT_SDK_AVSCOMMON_SDKINTERFACES_INCLUDE_AVSCOMMON_SDKINTERFACES_AUDIOINPUTPROCESSOROBSERVERINTERFACE_H_
 
#include <sstream>
#include <string>
 
namespace alexaClientSDK {
namespace avsCommon {
namespace sdkInterfaces {
 
class AudioInputProcessorObserverInterface {
public:
    enum class State {
        IDLE,
 
        EXPECTING_SPEECH,
 
        RECOGNIZING,
 
        BUSY
    };
 
    virtual ~AudioInputProcessorObserverInterface() = default;
 
    virtual void onStateChanged(State state) = 0;
 
    static std::string stateToString(State state) {
        switch (state) {
            case State::IDLE:
                return "IDLE";
            case State::EXPECTING_SPEECH:
                return "EXPECTING_SPEECH";
            case State::RECOGNIZING:
                return "RECOGNIZING";
            case State::BUSY:
                return "BUSY";
        }
        return "Unknown State";
    }
};
 
inline std::ostream& operator<<(std::ostream& stream, const AudioInputProcessorObserverInterface::State& state) {
    return stream << AudioInputProcessorObserverInterface::stateToString(state);
}
 
}  // namespace sdkInterfaces
}  // namespace avsCommon
}  // namespace alexaClientSDK
 
#endif  // ALEXA_CLIENT_SDK_AVSCOMMON_SDKINTERFACES_INCLUDE_AVSCOMMON_SDKINTERFACES_AUDIOINPUTPROCESSOROBSERVERINTERFACE_H_