OpusEncoderContext.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_SPEECHENCODER_OPUSENCODERCONTEXT_INCLUDE_SPEECHENCODER_OPUSENCODERCONTEXT_H_
#define ALEXA_CLIENT_SDK_SPEECHENCODER_OPUSENCODERCONTEXT_INCLUDE_SPEECHENCODER_OPUSENCODERCONTEXT_H_
 
#include <memory>
 
#include "SpeechEncoder/EncoderContext.h"
 
// We don't want to expose OPUS related structure type for user who utilize this class.
// (And those types are only used in private fields anyway.)
#ifdef OPUS_H
// Only an implementation file should know about the actual type.
#define OPUS_ENCODER OpusEncoder
#else
// Otherwise keep it general void pointer, to avoid opus.h dependency.
#define OPUS_ENCODER void
#endif
 
namespace alexaClientSDK {
namespace speechencoder {
 
class OpusEncoderContext : public EncoderContext {
public:
    static std::shared_ptr<EncoderContext> createEncoderContext();
 
    OpusEncoderContext();
 
    ~OpusEncoderContext();
 
    bool init(alexaClientSDK::avsCommon::utils::AudioFormat inputFormat) override;
 
    size_t getInputFrameSize() override;
 
    size_t getOutputFrameSize() override;
 
    bool requiresFullyRead() override;
 
    alexaClientSDK::avsCommon::utils::AudioFormat getAudioFormat() override;
 
    std::string getAVSFormatName() override;
 
    bool start() override;
 
    ssize_t processSamples(void* samples, size_t numberOfWords, uint8_t* buffer) override;
 
    void close() override;
 
private:
    bool configureEncoder();
 
    OPUS_ENCODER* m_encoder = NULL;
 
    alexaClientSDK::avsCommon::utils::AudioFormat m_outputFormat;
 
    alexaClientSDK::avsCommon::utils::AudioFormat m_inputFormat;
};
 
}  // namespace speechencoder
}  // namespace alexaClientSDK
 
#endif  // ALEXA_CLIENT_SDK_SPEECHENCODER_OPUSENCODERCONTEXT_INCLUDE_SPEECHENCODER_OPUSENCODERCONTEXT_H_