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#include <string>
#include <sstream>
#include <vector>
#include <list>
#include <memory>
#include <exception>
#include <thread>
#include <mutex>
#include <condition_variable>
#include "testmedia.hpp"
#include "logsupport.hpp"
#define SRT_ENABLE_VERBOSE_LOCK 1
#include "verbose.hpp"
#include "logging.h"
#include "threadname.h"
extern srt_logging::Logger applog;
template<class MediumDir>
struct Medium
{
MediumDir* med = nullptr;
std::unique_ptr<MediumDir> pinned_med;
std::list<MediaPacket> buffer;
std::mutex buffer_lock;
std::thread thr;
std::condition_variable ready;
srt::sync::atomic<bool> running {false};
std::exception_ptr xp; // To catch exception thrown by a thread
virtual void Runner() = 0;
void RunnerBase()
{
try
{
running = true;
Runner();
}
catch (...)
{
xp = std::current_exception();
}
//Verb() << "Medium: " << this << ": thread exit";
std::unique_lock<std::mutex> g(buffer_lock);
running = false;
ready.notify_all();
//Verb() << VerbLock << "Medium: EXIT NOTIFIED";
}
void run()
{
running = true;
std::ostringstream tns;
tns << typeid(*this).name() << ":" << this;
srt::ThreadName tn(tns.str());
thr = std::thread( [this] { RunnerBase(); } );
}
void quit()
{
if (!med)
return;
LOGP(applog.Debug, "Medium(", typeid(*med).name(), ") quit. Buffer contains ", buffer.size(), " blocks");
std::string name;
if (Verbose::on)
name = typeid(*med).name();
med->Close();
if (thr.joinable())
{
LOGP(applog.Debug, "Medium::quit: Joining medium thread (", name, ") ...");
thr.join();
LOGP(applog.Debug, "... done");
}
if (xp)
{
try {
std::rethrow_exception(xp);
} catch (TransmissionError& e) {
if (Verbose::on)
Verb() << VerbLock << "Medium " << this << " exited with Transmission Error:\n\t" << e.what();
else
std::cerr << "Transmission Error: " << e.what() << std::endl;
} catch (...) {
if (Verbose::on)
Verb() << VerbLock << "Medium " << this << " exited with UNKNOWN EXCEPTION:";
else
std::cerr << "UNKNOWN EXCEPTION on medium\n";
}
}
// Prevent further quits from running
med = nullptr;
}
void Setup(MediumDir* t)
{
med = t;
// Leave pinned_med as 0
}
void Setup(std::unique_ptr<MediumDir>&& medbase)
{
pinned_med = std::move(medbase);
med = pinned_med.get();
}
virtual ~Medium()
{
//Verb() << "Medium: " << this << " DESTROYED. Threads quit.";
quit();
}
virtual void Start() { run(); }
virtual void Stop() { quit(); }
};
struct SourceMedium: Medium<Source>
{
size_t chunksize_ = 0;
typedef Medium<Source> Base;
// Source Runner: read payloads and put on the buffer
void Runner() override;
// External user: call this to get the buffer.
MediaPacket Extract();
template<class Arg>
void Setup(Arg&& medium, size_t chunksize)
{
chunksize_ = chunksize;
return Base::Setup(std::move(medium));
}
};
struct TargetMedium: Medium<Target>
{
void Runner() override;
bool Schedule(const MediaPacket& data);
void Clear()
{
std::lock_guard<std::mutex> lg(buffer_lock);
buffer.clear();
}
void Interrupt()
{
std::lock_guard<std::mutex> lg(buffer_lock);
running = false;
ready.notify_one();
}
~TargetMedium()
{
//Verb() << "TargetMedium: DESTROYING";
Interrupt();
// ~Medium will do quit() additionally, which joins the thread
}
};
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