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/***
This file is part of snapcast
Copyright (C) 2014-2024 Johannes Pohl
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
#pragma once
// local headers
#include "common/resampler.hpp"
#include "pcm_stream.hpp"
// standard headers
#include <memory>
namespace streamreader
{
// Mixing digital audio:
// https://www.vttoth.com/CMS/technical-notes/?view=article&id=68
/// Reads and decodes PCM data
/**
* Reads PCM and passes the data to an encoder.
* Implements EncoderListener to get the encoded data.
* Data is passed to the PcmStream::Listener
*/
class MetaStream : public PcmStream, public PcmStream::Listener
{
public:
/// ctor. Encoded PCM data is passed to the PcmStream::Listener
MetaStream(PcmStream::Listener* pcmListener, const std::vector<std::shared_ptr<PcmStream>>& streams, boost::asio::io_context& ioc,
const ServerSettings& server_settings, const StreamUri& uri);
virtual ~MetaStream();
void start() override;
void stop() override;
// Setter for properties
void setShuffle(bool shuffle, ResultHandler handler) override;
void setLoopStatus(LoopStatus status, ResultHandler handler) override;
void setVolume(uint16_t volume, ResultHandler handler) override;
void setMute(bool mute, ResultHandler handler) override;
void setRate(float rate, ResultHandler handler) override;
// Control commands
void setPosition(std::chrono::milliseconds position, ResultHandler handler) override;
void seek(std::chrono::milliseconds offset, ResultHandler handler) override;
void next(ResultHandler handler) override;
void previous(ResultHandler handler) override;
void pause(ResultHandler handler) override;
void playPause(ResultHandler handler) override;
void stop(ResultHandler handler) override;
void play(ResultHandler handler) override;
protected:
/// Implementation of PcmStream::Listener
void onPropertiesChanged(const PcmStream* pcmStream, const Properties& properties) override;
void onStateChanged(const PcmStream* pcmStream, ReaderState state) override;
void onChunkRead(const PcmStream* pcmStream, const msg::PcmChunk& chunk) override;
void onChunkEncoded(const PcmStream* pcmStream, std::shared_ptr<msg::PcmChunk> chunk, double duration) override;
void onResync(const PcmStream* pcmStream, double ms) override;
protected:
std::vector<std::shared_ptr<PcmStream>> streams_;
std::recursive_mutex active_mutex_;
std::shared_ptr<PcmStream> active_stream_;
std::unique_ptr<Resampler> resampler_;
bool first_read_;
std::chrono::time_point<std::chrono::steady_clock> next_tick_;
};
} // namespace streamreader
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