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92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2024 Johannes Pohl
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#pragma once
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// local headers
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#include "common/message/codec_header.hpp"
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#include "common/message/pcm_chunk.hpp"
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#include "common/sample_format.hpp"
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// standard headers
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#include <functional>
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#include <memory>
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#include <string>
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namespace encoder
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{
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/// Abstract Encoder class
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/**
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* Stream encoder. PCM chunks are fed into the encoder.
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* As soon as a frame is encoded, the encoded data is passed to the EncoderListener
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*/
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class Encoder
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{
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public:
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using OnEncodedCallback = std::function<void(const Encoder&, std::shared_ptr<msg::PcmChunk>, double)>;
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/// ctor. Codec options (E.g. compression level) are passed as string and are codec dependend
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Encoder(const std::string& codecOptions = "") : headerChunk_(nullptr), codecOptions_(codecOptions)
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{
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}
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virtual ~Encoder() = default;
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/// The listener will receive the encoded stream
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virtual void init(OnEncodedCallback callback, const SampleFormat& format)
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{
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if (codecOptions_ == "")
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codecOptions_ = getDefaultOptions();
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encoded_callback_ = callback;
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sampleFormat_ = format;
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initEncoder();
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}
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/// Here the work is done. Encoded data is passed to the EncoderListener.
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virtual void encode(const msg::PcmChunk& chunk) = 0;
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virtual std::string name() const = 0;
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virtual std::string getAvailableOptions() const
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{
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return "No codec options supported";
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}
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virtual std::string getDefaultOptions() const
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{
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return "";
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}
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/// Header information needed to decode the data
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virtual std::shared_ptr<msg::CodecHeader> getHeader() const
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{
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return headerChunk_;
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}
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protected:
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virtual void initEncoder() = 0;
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SampleFormat sampleFormat_;
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std::shared_ptr<msg::CodecHeader> headerChunk_;
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std::string codecOptions_;
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OnEncodedCallback encoded_callback_;
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};
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} // namespace encoder
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