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badaix 2019-10-12 18:28:29 +02:00
parent ea3921d8b7
commit a30f548a31
87 changed files with 181 additions and 212 deletions
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server/streamreader/process_stream.cpp Normal file
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/***
This file is part of snapcast
Copyright (C) 2014-2019 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/>.
***/
#include "process_stream.hpp"
#include "common/aixlog.hpp"
#include "common/snap_exception.hpp"
#include "common/utils.hpp"
#include "common/utils/string_utils.hpp"
#include <fcntl.h>
#include <limits.h>
#include <sys/stat.h>
using namespace std;
ProcessStream::ProcessStream(PcmListener* pcmListener, const StreamUri& uri) : PcmStream(pcmListener, uri), path_(""), process_(nullptr)
{
params_ = uri_.getQuery("params");
logStderr_ = (uri_.getQuery("logStderr", "false") == "true");
}
ProcessStream::~ProcessStream()
{
if (process_)
process_->kill();
}
bool ProcessStream::fileExists(const std::string& filename)
{
struct stat buffer;
return (stat(filename.c_str(), &buffer) == 0);
}
std::string ProcessStream::findExe(const std::string& filename)
{
/// check if filename exists
if (fileExists(filename))
return filename;
std::string exe = filename;
if (exe.find("/") != string::npos)
exe = exe.substr(exe.find_last_of("/") + 1);
/// check with "which"
string which = execGetOutput("which " + exe);
if (!which.empty())
return which;
/// check in the same path as this binary
char buff[PATH_MAX];
char szTmp[32];
sprintf(szTmp, "/proc/%d/exe", getpid());
ssize_t len = readlink(szTmp, buff, sizeof(buff) - 1);
if (len != -1)
{
buff[len] = '\0';
return string(buff) + "/" + exe;
}
return "";
}
void ProcessStream::initExeAndPath(const std::string& filename)
{
path_ = "";
exe_ = findExe(filename);
if (exe_.find("/") != string::npos)
{
path_ = exe_.substr(0, exe_.find_last_of("/") + 1);
exe_ = exe_.substr(exe_.find_last_of("/") + 1);
}
if (!fileExists(path_ + exe_))
throw SnapException("file not found: \"" + filename + "\"");
}
void ProcessStream::start()
{
initExeAndPath(uri_.path);
PcmStream::start();
}
void ProcessStream::stop()
{
if (process_)
process_->kill();
PcmStream::stop();
/// thread is detached, so it is not joinable
if (stderrReaderThread_.joinable())
stderrReaderThread_.join();
}
void ProcessStream::onStderrMsg(const char* buffer, size_t n)
{
if (logStderr_)
{
string line = utils::string::trim_copy(string(buffer, n));
if ((line.find('\0') == string::npos) && !line.empty())
LOG(INFO) << "(" << getName() << ") " << line << "\n";
}
}
void ProcessStream::stderrReader()
{
size_t buffer_size = 8192;
auto buffer = std::unique_ptr<char[]>(new char[buffer_size]);
ssize_t n;
stringstream message;
while (active_ && (n = read(process_->getStderr(), buffer.get(), buffer_size)) > 0)
onStderrMsg(buffer.get(), n);
}
void ProcessStream::worker()
{
timeval tvChunk;
std::unique_ptr<msg::PcmChunk> chunk(new msg::PcmChunk(sampleFormat_, pcmReadMs_));
setState(kPlaying);
string lastException = "";
while (active_)
{
process_.reset(new Process(path_ + exe_ + " " + params_, path_));
int flags = fcntl(process_->getStdout(), F_GETFL, 0);
fcntl(process_->getStdout(), F_SETFL, flags | O_NONBLOCK);
stderrReaderThread_ = thread(&ProcessStream::stderrReader, this);
stderrReaderThread_.detach();
chronos::systemtimeofday(&tvChunk);
tvEncodedChunk_ = tvChunk;
long nextTick = chronos::getTickCount();
int idleBytes = 0;
int maxIdleBytes = sampleFormat_.rate * sampleFormat_.frameSize * dryoutMs_ / 1000;
try
{
while (active_)
{
chunk->timestamp.sec = tvChunk.tv_sec;
chunk->timestamp.usec = tvChunk.tv_usec;
int toRead = chunk->payloadSize;
int len = 0;
do
{
int count = read(process_->getStdout(), chunk->payload + len, toRead - len);
if (count < 0 && idleBytes < maxIdleBytes)
{
memset(chunk->payload + len, 0, toRead - len);
idleBytes += toRead - len;
len += toRead - len;
continue;
}
if (count < 0)
{
setState(kIdle);
if (!sleep(100))
break;
}
else if (count == 0)
throw SnapException("end of file");
else
{
len += count;
idleBytes = 0;
}
} while ((len < toRead) && active_);
if (!active_)
break;
encoder_->encode(chunk.get());
if (!active_)
break;
nextTick += pcmReadMs_;
chronos::addUs(tvChunk, pcmReadMs_ * 1000);
long currentTick = chronos::getTickCount();
if (nextTick >= currentTick)
{
setState(kPlaying);
if (!sleep(nextTick - currentTick))
break;
}
else
{
chronos::systemtimeofday(&tvChunk);
tvEncodedChunk_ = tvChunk;
pcmListener_->onResync(this, currentTick - nextTick);
nextTick = currentTick;
}
lastException = "";
}
}
catch (const std::exception& e)
{
if (lastException != e.what())
{
LOG(ERROR) << "(PipeStream) Exception: " << e.what() << std::endl;
lastException = e.what();
}
process_->kill();
if (!sleep(30000))
break;
}
}
}