mirror of
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124 lines
3.6 KiB
C++
124 lines
3.6 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2020 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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#ifndef PCM_STREAM_HPP
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#define PCM_STREAM_HPP
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#include "common/json.hpp"
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#include "common/sample_format.hpp"
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#include "encoder/encoder.hpp"
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#include "message/codec_header.hpp"
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#include "message/stream_tags.hpp"
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#include "stream_uri.hpp"
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#include <atomic>
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#include <boost/asio/io_context.hpp>
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#include <condition_variable>
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#include <map>
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#include <string>
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#include <vector>
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namespace streamreader
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{
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class PcmStream;
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enum class ReaderState
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{
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kUnknown = 0,
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kIdle = 1,
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kPlaying = 2,
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kDisabled = 3
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};
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static constexpr auto kUriCodec = "codec";
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static constexpr auto kUriName = "name";
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static constexpr auto kUriSampleFormat = "sampleformat";
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static constexpr auto kUriChunkMs = "chunk_ms";
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/// Callback interface for users of PcmStream
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/**
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* Users of PcmStream should implement this to get the data
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*/
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class PcmListener
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{
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public:
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virtual void onMetaChanged(const PcmStream* pcmStream) = 0;
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virtual void onStateChanged(const PcmStream* pcmStream, ReaderState state) = 0;
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virtual void onChunkRead(const PcmStream* pcmStream, const msg::PcmChunk& chunk) = 0;
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virtual void onChunkEncoded(const PcmStream* pcmStream, std::shared_ptr<msg::PcmChunk> chunk, double duration) = 0;
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virtual void onResync(const PcmStream* pcmStream, double ms) = 0;
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};
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/// Reads and decodes PCM data
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/**
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* Reads PCM and passes the data to an encoder.
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* Implements EncoderListener to get the encoded data.
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* Data is passed to the PcmListener
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*/
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class PcmStream
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{
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public:
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/// ctor. Encoded PCM data is passed to the PcmListener
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PcmStream(PcmListener* pcmListener, boost::asio::io_context& ioc, const StreamUri& uri);
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virtual ~PcmStream();
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virtual void start();
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virtual void stop();
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virtual std::shared_ptr<msg::CodecHeader> getHeader();
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virtual const StreamUri& getUri() const;
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virtual const std::string& getName() const;
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virtual const std::string& getId() const;
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virtual const SampleFormat& getSampleFormat() const;
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std::shared_ptr<msg::StreamTags> getMeta() const;
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void setMeta(const json& j);
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virtual ReaderState getState() const;
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virtual json toJson() const;
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void addListener(PcmListener* pcmListener);
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protected:
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std::atomic<bool> active_;
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void setState(ReaderState newState);
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void chunkRead(const msg::PcmChunk& chunk);
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void resync(const std::chrono::nanoseconds& duration);
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void chunkEncoded(const encoder::Encoder& encoder, std::shared_ptr<msg::PcmChunk> chunk, double duration);
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std::chrono::time_point<std::chrono::steady_clock> tvEncodedChunk_;
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std::vector<PcmListener*> pcmListeners_;
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StreamUri uri_;
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SampleFormat sampleFormat_;
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size_t chunk_ms_;
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std::unique_ptr<encoder::Encoder> encoder_;
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std::string name_;
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ReaderState state_;
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std::shared_ptr<msg::StreamTags> meta_;
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boost::asio::io_context& ioc_;
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};
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} // namespace streamreader
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#endif
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