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98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/*
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Copyright (c) 2015, Dimitri Diakopoulos All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef AUDIO_DECODER_H
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#define AUDIO_DECODER_H
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#include "Common.h"
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#include <utility>
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#include <map>
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#include <memory>
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namespace nqr
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{
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// Individual decoder classes will throw std::exceptions for bad things,
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// but NyquistIO implements this enum for high-level error notifications.
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enum IOError
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{
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NoError,
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NoDecodersLoaded,
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ExtensionNotSupported,
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LoadPathNotImplemented,
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LoadBufferNotImplemented,
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UnknownError
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};
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struct BaseDecoder
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{
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virtual int LoadFromPath(nqr::AudioData * data, const std::string & path) = 0;
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virtual int LoadFromBuffer(nqr::AudioData * data, const std::vector<uint8_t> & memory) = 0;
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virtual std::vector<std::string> GetSupportedFileExtensions() = 0;
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//@todo implement streaming helper methods here
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};
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typedef std::pair<std::string, std::shared_ptr<nqr::BaseDecoder>> DecoderPair;
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class NyquistIO
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{
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public:
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NyquistIO();
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~NyquistIO();
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int Load(AudioData * data, const std::string & path);
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int Load(AudioData *data, std::string extension, const std::vector<uint8_t> & buffer);
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bool IsFileSupported(const std::string path) const;
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private:
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std::string ParsePathForExtension(const std::string & path) const;
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std::shared_ptr<nqr::BaseDecoder> GetDecoderForExtension(const std::string ext);
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void BuildDecoderTable();
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template<typename T>
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void AddDecoderToTable(std::shared_ptr<T> decoder)
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{
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auto supportedExtensions = decoder->GetSupportedFileExtensions();
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//@todo: basic sanity checking that the extension isn't already supported
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for (const auto ext : supportedExtensions)
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{
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decoderTable.insert(DecoderPair(ext, decoder));
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}
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}
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std::map<std::string, std::shared_ptr<BaseDecoder>> decoderTable;
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NO_MOVE(NyquistIO);
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};
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} // end namespace nqr
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#endif |