hlsstreamhandler.cpp

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#include <chrono> // for milliseconds
#include <thread> // for sleep_for
 
// MythTV headers
#include "hlsstreamhandler.h"
#include "libmythbase/mythlogging.h"
#include "recorders/HLS/HLSReader.h"
 
#define LOC QString("HLSSH[%1](%2): ").arg(m_inputId).arg(m_device)
 
// BUFFER_SIZE is a multiple of TS_SIZE
static constexpr qint64 TS_SIZE     { 188           };
static constexpr qint64 BUFFER_SIZE { 512 * TS_SIZE };
 
QMap<QString,HLSStreamHandler*>  HLSStreamHandler::s_hlshandlers;
QMap<QString,uint>               HLSStreamHandler::s_hlshandlers_refcnt;
QMutex                           HLSStreamHandler::s_hlshandlers_lock;
 
HLSStreamHandler* HLSStreamHandler::Get(const IPTVTuningData& tuning, int inputid)
{
    QMutexLocker locker(&s_hlshandlers_lock);
 
    QString devkey = tuning.GetDeviceKey();
 
    QMap<QString,HLSStreamHandler*>::iterator it = s_hlshandlers.find(devkey);
 
    if (it == s_hlshandlers.end())
    {
        auto* newhandler = new HLSStreamHandler(tuning, inputid);
        newhandler->Start();
        s_hlshandlers[devkey] = newhandler;
        s_hlshandlers_refcnt[devkey] = 1;
 
        LOG(VB_RECORD, LOG_INFO,
            QString("HLSSH[%1]: Creating new stream handler %2 for %3")
            .arg(QString::number(inputid), devkey, tuning.GetDeviceName()));
    }
    else
    {
        s_hlshandlers_refcnt[devkey]++;
        uint rcount = s_hlshandlers_refcnt[devkey];
        LOG(VB_RECORD, LOG_INFO,
            QString("HLSSH[%1]: Using existing stream handler %2 for %3")
            .arg(QString::number(inputid), devkey, tuning.GetDeviceName()) +
            QString(" (%1 in use)").arg(rcount));
    }
 
    return s_hlshandlers[devkey];
}
 
void HLSStreamHandler::Return(HLSStreamHandler* & ref, int inputid)
{
    QMutexLocker locker(&s_hlshandlers_lock);
 
    QString devname = ref->m_device;
 
    QMap<QString,uint>::iterator rit = s_hlshandlers_refcnt.find(devname);
    if (rit == s_hlshandlers_refcnt.end())
        return;
 
    LOG(VB_RECORD, LOG_INFO, QString("HLSSH[%1]: Return(%2) has %3 handlers")
        .arg(inputid).arg(devname).arg(*rit));
 
    if (*rit > 1)
    {
        ref = nullptr;
        (*rit)--;
        return;
    }
 
    QMap<QString,HLSStreamHandler*>::iterator it = s_hlshandlers.find(devname);
    if ((it != s_hlshandlers.end()) && (*it == ref))
    {
        LOG(VB_RECORD, LOG_INFO, QString("HLSSH[%1]: Closing handler for %2")
                           .arg(inputid).arg(devname));
        ref->Stop();
        LOG(VB_RECORD, LOG_DEBUG, QString("HLSSH[%1]: handler for %2 stopped")
            .arg(inputid).arg(devname));
        delete *it;
        s_hlshandlers.erase(it);
    }
    else
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("HLSSH[%1] Error: Couldn't find handler for %2")
            .arg(inputid).arg(devname));
    }
 
    s_hlshandlers_refcnt.erase(rit);
    ref = nullptr;
}
 
HLSStreamHandler::HLSStreamHandler(const IPTVTuningData& tuning, int inputid)
    : IPTVStreamHandler(tuning, inputid)
{
    LOG(VB_GENERAL, LOG_INFO, LOC + "ctor");
    m_hls        = new HLSReader(m_inputId);
    m_readbuffer = new uint8_t[BUFFER_SIZE];
}
 
HLSStreamHandler::~HLSStreamHandler(void)
{
    LOG(VB_CHANNEL, LOG_INFO, LOC + "dtor");
    Stop();
    delete m_hls;
    delete[] m_readbuffer;
}
 
void HLSStreamHandler::run(void)
{
    RunProlog();
 
    QString url = m_tuning.GetURL(0).toString();
    int err_cnt = 0;
    int nil_cnt = 0;
    std::chrono::milliseconds open_sleep = 500ms;
 
    LOG(VB_GENERAL, LOG_INFO, LOC + "run() -- begin");
 
    SetRunning(true, false, false);
 
    if (!m_hls)
        return;
    m_hls->Throttle(false);
 
    qint64 remainder = 0;
    while (m_runningDesired)
    {
        if (!m_hls->IsOpen(url))
        {
            if (!m_hls->Open(url, m_tuning.GetBitrate(0)))
            {
                if (m_hls->FatalError())
                    break;
                std::this_thread::sleep_for(open_sleep);
                if (open_sleep < 20s)
                    open_sleep += 500ms;
                continue;
            }
            open_sleep = 500ms;
            m_hls->Throttle(m_throttle);
            m_throttle = false;
        }
 
        qint64 size = m_hls->Read(&m_readbuffer[remainder],
                                  BUFFER_SIZE - remainder);
 
        size += remainder;
 
        if (size < 0)
        {
            // error
            if (++err_cnt > 10)
            {
                LOG(VB_RECORD, LOG_ERR, LOC + "HLSReader failed");
                Stop();
                break;
            }
            continue;
        }
        err_cnt = 0;
 
        if (size == 0)
        {
            if (nil_cnt < 4)
                ++nil_cnt;
            // range .25 to 1 second
            std::this_thread::sleep_for(nil_cnt * 250ms);
            continue;
        }
        nil_cnt = 0;
 
        if (m_readbuffer[0] != 0x47)
        {
            LOG(VB_RECORD, LOG_INFO, LOC +
                QString("Packet not starting with SYNC Byte (got 0x%1)")
                .arg((char)m_readbuffer[0], 2, 16, QLatin1Char('0')));
            continue;
        }
 
        {
            QMutexLocker locker(&m_listenerLock);
            for (auto sit = m_streamDataList.cbegin(); sit != m_streamDataList.cend(); ++sit)
                remainder = sit.key()->ProcessData(m_readbuffer, size);
        }
 
        if (remainder > 0)
        {
            if (size > remainder) // unprocessed bytes
                memmove(m_readbuffer, &(m_readbuffer[size - remainder]),
                        remainder);
 
            LOG(VB_RECORD, LOG_INFO, LOC +
                QString("data_length = %1 remainder = %2")
                .arg(size).arg(remainder));
        }
 
        if (m_hls->IsThrottled())
            std::this_thread::sleep_for(1s);
        else if (size < BUFFER_SIZE)
        {
            LOG(VB_RECORD, LOG_DEBUG, LOC +
                QString("Requested %1 bytes, got %2 bytes.")
                .arg(BUFFER_SIZE).arg(size));
            // hundredth of a second.
            std::this_thread::sleep_for(10ms);
        }
        else
        {
            std::this_thread::sleep_for(1ms);
        }
    }
 
    m_hls->Throttle(false);
 
    SetRunning(false, false, false);
    RunEpilog();
 
    LOG(VB_GENERAL, LOG_INFO, LOC + "run() -- done");
}