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90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2019 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 STREAM_H
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#define STREAM_H
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#include "common/queue.h"
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#include "common/sample_format.hpp"
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#include "double_buffer.hpp"
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#include "message/message.hpp"
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#include "message/pcm_chunk.hpp"
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#include <deque>
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#include <memory>
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/// Time synchronized audio stream
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/**
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* Queue with PCM data.
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* Returns "online" server-time-synchronized PCM data
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*/
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class Stream
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{
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public:
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Stream(const SampleFormat& format);
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/// Adds PCM data to the queue
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void addChunk(msg::PcmChunk* chunk);
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void clearChunks();
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/// Get PCM data, which will be played out in "outputBufferDacTime" time
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/// frame = (num_channels) * (1 sample in bytes) = (2 channels) * (2 bytes (16 bits) per sample) = 4 bytes (32 bits)
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bool getPlayerChunk(void* outputBuffer, const chronos::usec& outputBufferDacTime, unsigned long framesPerBuffer);
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/// "Server buffer": playout latency, e.g. 1000ms
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void setBufferLen(size_t bufferLenMs);
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const SampleFormat& getFormat() const
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{
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return format_;
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}
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bool waitForChunk(size_t ms) const;
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private:
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chronos::time_point_clk getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long framesPerBuffer);
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chronos::time_point_clk getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long framesPerBuffer, long framesCorrection);
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chronos::time_point_clk getSilentPlayerChunk(void* outputBuffer, unsigned long framesPerBuffer);
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chronos::time_point_clk seek(long ms);
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// time_point_ms seekTo(const time_point_ms& to);
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void updateBuffers(int age);
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void resetBuffers();
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void setRealSampleRate(double sampleRate);
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SampleFormat format_;
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chronos::usec sleep_;
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Queue<std::shared_ptr<msg::PcmChunk>> chunks_;
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// DoubleBuffer<chronos::usec::rep> cardBuffer;
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DoubleBuffer<chronos::usec::rep> miniBuffer_;
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DoubleBuffer<chronos::usec::rep> buffer_;
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DoubleBuffer<chronos::usec::rep> shortBuffer_;
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std::shared_ptr<msg::PcmChunk> chunk_;
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int median_;
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int shortMedian_;
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time_t lastUpdate_;
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unsigned long playedFrames_;
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long correctAfterXFrames_;
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chronos::msec bufferMs_;
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};
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#endif
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