mirror of
https://github.com/badaix/snapcast.git
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153 lines
3.7 KiB
C++
153 lines
3.7 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2018 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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#include <memory>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <cerrno>
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#include "pipeStream.h"
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#include "encoder/encoderFactory.h"
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#include "common/snapException.h"
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#include "common/strCompat.h"
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#include "aixlog.hpp"
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using namespace std;
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PipeStream::PipeStream(PcmListener* pcmListener, const StreamUri& uri) : PcmStream(pcmListener, uri), fd_(-1)
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{
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umask(0);
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string mode = uri_.getQuery("mode", "create");
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LOG(INFO) << "PipeStream mode: " << mode << "\n";
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if ((mode != "read") && (mode != "create"))
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throw SnapException("create mode for fifo must be \"read\" or \"create\"");
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if (mode == "create")
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{
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if ((mkfifo(uri_.path.c_str(), 0666) != 0) && (errno != EEXIST))
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throw SnapException("failed to make fifo \"" + uri_.path + "\": " + cpt::to_string(errno));
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}
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}
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PipeStream::~PipeStream()
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{
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if (fd_ != -1)
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close(fd_);
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}
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void PipeStream::worker()
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{
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timeval tvChunk;
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std::unique_ptr<msg::PcmChunk> chunk(new msg::PcmChunk(sampleFormat_, pcmReadMs_));
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string lastException = "";
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while (active_)
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{
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if (fd_ != -1)
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close(fd_);
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fd_ = open(uri_.path.c_str(), O_RDONLY | O_NONBLOCK);
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chronos::systemtimeofday(&tvChunk);
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tvEncodedChunk_ = tvChunk;
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long nextTick = chronos::getTickCount();
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int idleBytes = 0;
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int maxIdleBytes = sampleFormat_.rate*sampleFormat_.frameSize*dryoutMs_/1000;
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try
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{
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if (fd_ == -1)
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throw SnapException("failed to open fifo: \"" + uri_.path + "\"");
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while (active_)
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{
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chunk->timestamp.sec = tvChunk.tv_sec;
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chunk->timestamp.usec = tvChunk.tv_usec;
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int toRead = chunk->payloadSize;
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int len = 0;
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do
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{
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int count = read(fd_, chunk->payload + len, toRead - len);
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if (count < 0 && idleBytes < maxIdleBytes)
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{
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memset(chunk->payload + len, 0, toRead - len);
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idleBytes += toRead - len;
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len += toRead - len;
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continue;
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}
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if (count < 0)
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{
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setState(kIdle);
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if (!sleep(100))
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break;
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}
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else if (count == 0)
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throw SnapException("end of file");
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else
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{
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len += count;
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idleBytes = 0;
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}
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}
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while ((len < toRead) && active_);
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if (!active_) break;
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/// TODO: use less raw pointers, make this encoding more transparent
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encoder_->encode(chunk.get());
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if (!active_) break;
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nextTick += pcmReadMs_;
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chronos::addUs(tvChunk, pcmReadMs_ * 1000);
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long currentTick = chronos::getTickCount();
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if (nextTick >= currentTick)
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{
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setState(kPlaying);
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if (!sleep(nextTick - currentTick))
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break;
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}
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else
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{
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chronos::systemtimeofday(&tvChunk);
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tvEncodedChunk_ = tvChunk;
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pcmListener_->onResync(this, currentTick - nextTick);
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nextTick = currentTick;
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}
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lastException = "";
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}
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}
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catch(const std::exception& e)
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{
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if (lastException != e.what())
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{
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LOG(ERROR) << "(PipeStream) Exception: " << e.what() << std::endl;
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lastException = e.what();
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}
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if (!sleep(100))
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break;
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}
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}
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}
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