v4lchannel.cpp

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// Std C headers
#include <cstdio>
#include <cstdlib>
#include <cerrno>

// POSIX headers
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>

// C++ headers
#include <algorithm>
#include <iostream>
using namespace std;

#ifdef USING_V4L1
#include <linux/videodev.h>
#endif // USING_V4L1

#include <linux/videodev2.h>

// MythTV headers
#include "v4lchannel.h"
#include "frequencies.h"
#include "tv_rec.h"
#include "mythdb.h"
#include "channelutil.h"
#include "cardutil.h"

#define DEBUG_ATTRIB 1

#define LOC      QString("V4LChannel(%1): ").arg(device)

static int format_to_mode(const QString& fmt, int v4l_version);
static QString mode_to_format(int mode, int v4l_version);

V4LChannel::V4LChannel(TVRec *parent, const QString &videodevice)
    : DTVChannel(parent),
      device(videodevice),          videofd(-1),
      device_name(),                driver_name(),
      curList(NULL),                totalChannels(0),
      currentFormat(),
      usingv4l2(false),
      has_stream_io(false),         has_std_io(false),
      has_async_io(false),
      has_tuner(false),             has_sliced_vbi(false),

      defaultFreqTable(1)
{
}

V4LChannel::~V4LChannel(void)
{
    Close();
}

bool V4LChannel::Init(QString &inputname, QString &startchannel, bool setchan)
{
    if (setchan)
    {
        SetFormat(gCoreContext->GetSetting("TVFormat"));
        SetDefaultFreqTable(gCoreContext->GetSetting("FreqTable"));
    }
    return ChannelBase::Init(inputname, startchannel, setchan);
}

bool V4LChannel::Open(void)
{
#if FAKE_VIDEO
    return true;
#endif
    if (videofd >= 0)
        return true;

    QByteArray ascii_device = device.toAscii();
    videofd = open(ascii_device.constData(), O_RDWR);
    if (videofd < 0)
    {
         LOG(VB_GENERAL, LOG_ERR, LOC + "Can't open video device." + ENO);
         return false;
    }

    uint32_t version, capabilities;
    if (!CardUtil::GetV4LInfo(videofd, device_name, driver_name,
                              version, capabilities))
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to query capabilities." + ENO);
        Close();
        return false;
    }

    usingv4l2      = !!(capabilities & V4L2_CAP_VIDEO_CAPTURE);
    has_stream_io  = !!(capabilities & V4L2_CAP_STREAMING);
    has_std_io     = !!(capabilities & V4L2_CAP_READWRITE);
    has_async_io   = !!(capabilities & V4L2_CAP_ASYNCIO);
    has_tuner      = !!(capabilities & V4L2_CAP_TUNER);
    has_sliced_vbi = !!(capabilities & V4L2_CAP_SLICED_VBI_CAPTURE);

    if (driver_name == "bttv" || driver_name == "cx8800")
        has_stream_io = false; // driver workaround, see #9825 & #10519

    LOG(VB_CHANNEL, LOG_INFO, LOC + QString("Device name '%1' driver '%2'.")
            .arg(device_name).arg(driver_name));

    LOG(VB_CHANNEL, LOG_INFO, LOC +
        QString("v4l2: %1 stream io: %2 std io: %3 async io: %4 "
                "tuner %5 sliced vbi %6")
            .arg(usingv4l2)
            .arg(has_stream_io).arg(has_std_io).arg(has_async_io)
            .arg(has_tuner).arg(has_sliced_vbi));

    if (!InitializeInputs())
    {
        Close();
        return false;
    }

    SetFormat("Default");

    return true;
}

void V4LChannel::Close(void)
{
    if (videofd >= 0)
        close(videofd);
    videofd = -1;
}

void V4LChannel::SetFd(int fd)
{
    if (fd != videofd)
        Close();
    videofd = (fd >= 0) ? fd : -1;
}

static int format_to_mode(const QString &fmt, int v4l_version)
{
    if (2 == v4l_version)
    {
        if (fmt == "PAL-BG")
            return V4L2_STD_PAL_BG;
        else if (fmt == "PAL-D")
            return V4L2_STD_PAL_D;
        else if (fmt == "PAL-DK")
            return V4L2_STD_PAL_DK;
        else if (fmt == "PAL-I")
            return V4L2_STD_PAL_I;
        else if (fmt == "PAL-60")
            return V4L2_STD_PAL_60;
        else if (fmt == "SECAM")
            return V4L2_STD_SECAM;
        else if (fmt == "SECAM-D")
            return V4L2_STD_SECAM_D;
        else if (fmt == "SECAM-DK")
            return V4L2_STD_SECAM_DK;
        else if (fmt == "PAL-NC")
            return V4L2_STD_PAL_Nc;
        else if (fmt == "PAL-M")
            return V4L2_STD_PAL_M;
        else if (fmt == "PAL-N")
            return V4L2_STD_PAL_N;
        else if (fmt == "NTSC-JP")
            return V4L2_STD_NTSC_M_JP;
        // generics...
        else if (fmt.left(4) == "NTSC")
            return V4L2_STD_NTSC;
        else if (fmt.left(4) == "ATSC")
            return V4L2_STD_NTSC; // We've dropped V4L ATSC support...
        else if (fmt.left(3) == "PAL")
            return V4L2_STD_PAL;
        return V4L2_STD_NTSC;
    }
#ifdef USING_V4L1
    else if (1 == v4l_version)
    {
        if (fmt == "NTSC-JP")
            return 6;
        else if (fmt.left(5) == "SECAM")
            return VIDEO_MODE_SECAM;
        else if (fmt == "PAL-NC")
            return 3;
        else if (fmt == "PAL-M")
            return 4;
        else if (fmt == "PAL-N")
            return 5;
        // generics...
        else if (fmt.left(3) == "PAL")
            return VIDEO_MODE_PAL;
        else if (fmt.left(4) == "NTSC")
            return VIDEO_MODE_NTSC;
        else if (fmt.left(4) == "ATSC")
            return VIDEO_MODE_NTSC; // We've dropped V4L ATSC support...
        return VIDEO_MODE_NTSC;
    }
#else
    else if (v4l_version == 1)
    {
        return V4L2_STD_NTSC;
    }
#endif

    LOG(VB_GENERAL, LOG_ERR,
        QString("format_to_mode() does not recognize V4L") + v4l_version);

    return V4L2_STD_NTSC; // assume V4L version 2
}

static QString mode_to_format(int mode, int v4l_version)
{
    if (2 == v4l_version)
    {
        if (mode == V4L2_STD_NTSC)
            return "NTSC";
        else if (mode == V4L2_STD_NTSC_M_JP)
            return "NTSC-JP";
        else if (mode == V4L2_STD_PAL)
            return "PAL";
        else if (mode == V4L2_STD_PAL_60)
            return "PAL-60";
        else if (mode == V4L2_STD_PAL_BG)
            return "PAL-BG";
        else if (mode == V4L2_STD_PAL_D)
            return "PAL-D";
        else if (mode == V4L2_STD_PAL_DK)
            return "PAL-DK";
        else if (mode == V4L2_STD_PAL_I)
            return "PAL-I";
        else if (mode == V4L2_STD_PAL_M)
            return "PAL-M";
        else if (mode == V4L2_STD_PAL_N)
            return "PAL-N";
        else if (mode == V4L2_STD_PAL_Nc)
            return "PAL-NC";
        else if (mode == V4L2_STD_SECAM)
            return "SECAM";
        else if (mode == V4L2_STD_SECAM_D)
            return "SECAM-D";
        // generic..
        else if ((V4L2_STD_NTSC_M      == mode) ||
                 (V4L2_STD_NTSC_443    == mode) ||
                 (V4L2_STD_NTSC_M_KR   == mode))
            return "NTSC";
        else if ((V4L2_STD_PAL_B       == mode) ||
                 (V4L2_STD_PAL_B1      == mode) ||
                 (V4L2_STD_PAL_G       == mode) ||
                 (V4L2_STD_PAL_H       == mode) ||
                 (V4L2_STD_PAL_D1      == mode) ||
                 (V4L2_STD_PAL_K       == mode))
            return "PAL";
        else if ((V4L2_STD_SECAM_B     == mode) ||
                 (V4L2_STD_SECAM_DK    == mode) ||
                 (V4L2_STD_SECAM_G     == mode) ||
                 (V4L2_STD_SECAM_H     == mode) ||
                 (V4L2_STD_SECAM_K     == mode) ||
                 (V4L2_STD_SECAM_K1    == mode) ||
                 (V4L2_STD_SECAM_L     == mode) ||
                 (V4L2_STD_SECAM_LC    == mode))
            return "SECAM";
        else if ((V4L2_STD_ATSC        == mode) ||
                 (V4L2_STD_ATSC_8_VSB  == mode) ||
                 (V4L2_STD_ATSC_16_VSB == mode))
        {
            // We've dropped V4L ATSC support, but this still needs to be
            // returned here so we will change the mode if the device is
            // in ATSC mode already.
            return "ATSC";
        }
    }
#ifdef USING_V4L1
    else if (1 == v4l_version)
    {
        if (mode == VIDEO_MODE_NTSC)
            return "NTSC";
        else if (mode == VIDEO_MODE_PAL)
            return "PAL";
        else if (mode == VIDEO_MODE_SECAM)
            return "SECAM";
        else if (mode == 3)
            return "PAL-NC";
        else if (mode == 5)
            return "PAL-N";
        else if (mode == 6)
            return "NTSC-JP";
    }
#else
    if (1 == v4l_version)
    {
        return "Unknown";
    }
#endif
    else
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("mode_to_format() does not recognize V4L") + v4l_version);
    }

    return "Unknown";
}

bool V4LChannel::InitializeInputs(void)
{
    // Get Inputs from DB
    if (!ChannelBase::InitializeInputs())
        return false;

    // Get global TVFormat setting
    QString fmt = gCoreContext->GetSetting("TVFormat");
    LOG(VB_CHANNEL, LOG_INFO, QString("Global TVFormat Setting '%1'").arg(fmt));
    int videomode_v4l1 = format_to_mode(fmt.toUpper(), 1);
    int videomode_v4l2 = format_to_mode(fmt.toUpper(), 2);

    bool ok = false;
    InputNames v4l_inputs = CardUtil::ProbeV4LVideoInputs(videofd, ok);

    // Insert info from hardware
    uint valid_cnt = 0;
    InputMap::const_iterator it;
    for (it = m_inputs.begin(); it != m_inputs.end(); ++it)
    {
        InputNames::const_iterator v4l_it = v4l_inputs.begin();
        for (; v4l_it != v4l_inputs.end(); ++v4l_it)
        {
            if (*v4l_it == (*it)->name)
            {
                (*it)->inputNumV4L   = v4l_it.key();
                (*it)->videoModeV4L1 = videomode_v4l1;
                (*it)->videoModeV4L2 = videomode_v4l2;
                valid_cnt++;
            }
        }
    }

    // print em
    for (it = m_inputs.begin(); it != m_inputs.end(); ++it)
    {
        LOG(VB_CHANNEL, LOG_INFO, LOC +
            QString("Input #%1: '%2' schan(%3) tun(%4) v4l1(%5) v4l2(%6)")
                .arg(it.key()).arg((*it)->name).arg((*it)->startChanNum)
                .arg((*it)->tuneToChannel)
                .arg(mode_to_format((*it)->videoModeV4L1,1))
                .arg(mode_to_format((*it)->videoModeV4L2,2)));
    }

    return valid_cnt;
}

void V4LChannel::SetFormat(const QString &format)
{
    if (!Open())
        return;

    int inputNum = m_currentInputID;
    if (m_currentInputID < 0)
        inputNum = GetNextInputNum();

    QString fmt = format;
    if ((fmt == "Default") || format.isEmpty())
    {
        InputMap::const_iterator it = m_inputs.find(inputNum);
        if (it != m_inputs.end())
            fmt = mode_to_format((*it)->videoModeV4L2, 2);
    }

    LOG(VB_CHANNEL, LOG_INFO, LOC + QString("SetFormat(%1) fmt(%2) input(%3)")
            .arg(format).arg(fmt).arg(inputNum));

    if ((fmt == currentFormat) || SetInputAndFormat(inputNum, fmt))
    {
        currentFormat = fmt;
    }
}

int V4LChannel::SetDefaultFreqTable(const QString &name)
{
    defaultFreqTable = SetFreqTable(name);
    return defaultFreqTable;
}

void V4LChannel::SetFreqTable(const int index)
{
    curList = chanlists[index].list;
    totalChannels = chanlists[index].count;
}

int V4LChannel::SetFreqTable(const QString &tablename)
{
    QString name = tablename;
    bool use_default = (name.toLower() == "default" || name.isEmpty());

    int i = 0;
    char *listname = (char *)chanlists[i].name;

    curList = NULL;
    while (listname != NULL)
    {
        if (use_default)
        {
            if (i == defaultFreqTable)
            {
                SetFreqTable(i);
                return i;
            }
        }
        else if (name == listname)
        {
            SetFreqTable(i);
            return i;
        }
        i++;
        listname = (char *)chanlists[i].name;
    }

    LOG(VB_CHANNEL, LOG_ERR, 
        QString("Channel(%1)::SetFreqTable(): Invalid "
                "frequency table name %2, using %3.").
            arg(device).arg(name).arg((char *)chanlists[1].name));
    SetFreqTable(1);
    return 1;
}

int V4LChannel::GetCurrentChannelNum(const QString &channame)
{
    for (int i = 0; i < totalChannels; i++)
    {
        if (channame == curList[i].name)
            return i;
    }

    LOG(VB_GENERAL, LOG_ERR, LOC +
        QString("GetCurrentChannelNum(%1): Failed to find Channel")
            .arg(channame));

    return -1;
}

bool V4LChannel::Tune(const QString &freqid, int finetune)
{
    int i = GetCurrentChannelNum(freqid);
    LOG(VB_CHANNEL, LOG_INFO,
        QString("Channel(%1)::Tune(%2): curList[%3].freq(%4)")
            .arg(device).arg(freqid).arg(i)
            .arg((i != -1) ? curList[i].freq : -1));

    if (i == -1)
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("Channel(%1)::Tune(%2): Error, failed to find channel.")
                .arg(device).arg(freqid));
        return false;
    }

    int frequency = (curList[i].freq + finetune) * 1000;

    return Tune(frequency, "");
}

bool V4LChannel::Tune(const DTVMultiplex &tuning, QString inputname)
{
    return Tune(tuning.frequency - 1750000, // to visual carrier
                inputname);
}

bool V4LChannel::Tune(uint64_t frequency, QString inputname)
{
    LOG(VB_CHANNEL, LOG_INFO, LOC + QString("Tune(%1, %2)")
            .arg(frequency).arg(inputname));

    int ioctlval = 0;

    int inputnum = GetInputByName(inputname);

    bool ok = true;
    if ((inputnum >= 0) && (GetCurrentInputNum() != inputnum))
        ok = SwitchToInput(inputnum, false);
    else if (GetCurrentInputNum() < 0)
        ok = SwitchToInput(0, false);

    if (!ok)
        return false;

    // Video4Linux version 2 tuning
    if (usingv4l2)
    {
        bool isTunerCapLow = false;
        struct v4l2_modulator mod;
        memset(&mod, 0, sizeof(mod));
        mod.index = 0;
        ioctlval = ioctl(videofd, VIDIOC_G_MODULATOR, &mod);
        if (ioctlval >= 0)
        {
            isTunerCapLow = (mod.capability & V4L2_TUNER_CAP_LOW);
            LOG(VB_CHANNEL, LOG_INFO, 
                QString("  name: %1").arg((char *)mod.name));
            LOG(VB_CHANNEL, LOG_INFO, QString("CapLow: %1").arg(isTunerCapLow));
        }

        struct v4l2_frequency vf;
        memset(&vf, 0, sizeof(vf));

        vf.tuner = 0; // use first tuner
        vf.frequency = (isTunerCapLow) ?
            ((int)(frequency / 62.5)) : (frequency / 62500);

        vf.type = V4L2_TUNER_ANALOG_TV;

        ioctlval = ioctl(videofd, VIDIOC_S_FREQUENCY, &vf);
        if (ioctlval < 0)
        {
            LOG(VB_GENERAL, LOG_ERR,
                QString("Channel(%1)::Tune(): Error %2 "
                        "while setting frequency (v2): %3")
                    .arg(device).arg(ioctlval).arg(strerror(errno)));
            return false;
        }
        ioctlval = ioctl(videofd, VIDIOC_G_FREQUENCY, &vf);

        if (ioctlval >= 0)
        {
            LOG(VB_CHANNEL, LOG_INFO,
                QString("Channel(%1)::Tune(): Frequency is now %2")
                    .arg(device).arg(vf.frequency * 62500));
        }

        return true;
    }

#ifdef USING_V4L1
    // Video4Linux version 1 tuning
    uint freq = frequency / 62500;
    ioctlval = ioctl(videofd, VIDIOCSFREQ, &freq);
    if (ioctlval < 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("Channel(%1)::Tune(): Error %2 "
                    "while setting frequency (v1): %3")
                .arg(device).arg(ioctlval).arg(strerror(errno)));
        return false;
    }
    return true;
#else
    return false;
#endif
}

bool V4LChannel::Retune(void)
{
    if (usingv4l2)
    {
        struct v4l2_frequency vf;
        memset(&vf, 0, sizeof(vf));

        vf.tuner = 0; // use first tuner
        vf.type = V4L2_TUNER_ANALOG_TV;

        // Get the last tuned frequency
        int ioctlval = ioctl(videofd, VIDIOC_G_FREQUENCY, &vf);
        if (ioctlval < 0)
        {
            LOG(VB_GENERAL, LOG_ERR, LOC + "Retune failed (1)" + ENO);
            return false;
        }

        // Set the last tuned frequency again...
        ioctlval = ioctl(videofd, VIDIOC_S_FREQUENCY, &vf);
        if (ioctlval < 0)
        {
            LOG(VB_GENERAL, LOG_ERR, LOC + "Retune failed (2)" + ENO);
            return false;
        }

        return true;
    }

    return false;
}

QString V4LChannel::GetFormatForChannel(QString channum, QString inputname)
{
    MSqlQuery query(MSqlQuery::InitCon());
    query.prepare(
        "SELECT tvformat "
        "FROM channel, cardinput "
        "WHERE channum            = :CHANNUM   AND "
        "      inputname          = :INPUTNAME AND "
        "      cardinput.cardid   = :CARDID    AND "
        "      cardinput.sourceid = channel.sourceid");
    query.bindValue(":CHANNUM",   channum);
    query.bindValue(":INPUTNAME", inputname);
    query.bindValue(":CARDID",    GetCardID());

    QString fmt = QString::null;
    if (!query.exec() || !query.isActive())
        MythDB::DBError("SwitchToInput:find format", query);
    else if (query.next())
        fmt = query.value(0).toString();
    return fmt;
}

bool V4LChannel::SetInputAndFormat(int inputNum, QString newFmt)
{
    InputMap::const_iterator it = m_inputs.find(inputNum);
    if (it == m_inputs.end() || (*it)->inputNumV4L < 0)
        return false;

    int inputNumV4L = (*it)->inputNumV4L;
    bool usingv4l1 = !usingv4l2;
    bool ok = true;

    QString msg =
        QString("SetInputAndFormat(%1, %2) ").arg(inputNum).arg(newFmt);

    if (usingv4l2)
    {
        struct v4l2_input input;
        int ioctlval = ioctl(videofd, VIDIOC_G_INPUT, &input);
        bool input_switch = (0 != ioctlval || (uint)inputNumV4L != input.index);

        const v4l2_std_id new_vid_mode = format_to_mode(newFmt, 2);
        v4l2_std_id cur_vid_mode;
        ioctlval = ioctl(videofd, VIDIOC_G_STD, &cur_vid_mode);
        bool mode_switch = (0 != ioctlval || new_vid_mode != cur_vid_mode);
        bool needs_switch = input_switch || mode_switch;

        LOG(VB_GENERAL, LOG_INFO, LOC + msg + "(v4l v2) " +
            QString("input_switch: %1 mode_switch: %2")
                .arg(input_switch).arg(mode_switch));

        // ConvertX (wis-go7007) requires streaming to be disabled
        // before an input switch, do this if CAP_STREAMING is set.
        bool streamingDisabled = false;
        int  streamType = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        if (needs_switch && has_stream_io)
        {
            ioctlval = ioctl(videofd, VIDIOC_STREAMOFF, &streamType);
            if (ioctlval < 0)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC + msg +
                    "\n\t\t\twhile disabling streaming (v4l v2)" + ENO);
                ok = false;
            }
            else
            {
                streamingDisabled = true;
            }
        }

        if (input_switch)
        {
            // Send the input switch ioctl.
            ioctlval = ioctl(videofd, VIDIOC_S_INPUT, &inputNumV4L);
            if (ioctlval < 0)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC + msg +
                    "\n\t\t\twhile setting input (v4l v2)" + ENO);

                ok = false;
            }
        }

        if (mode_switch)
        {
            ioctlval = ioctl(videofd, VIDIOC_S_STD, &new_vid_mode);
            if (ioctlval < 0)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC + msg +
                    "\n\t\t\twhile setting format (v4l v2)" + ENO);

                ok = false;
            }
        }

        if (streamingDisabled)
        {
            ioctlval = ioctl(videofd, VIDIOC_STREAMON, &streamType);
            if (ioctlval < 0)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC + msg +
                    "\n\t\t\twhile reenabling streaming (v4l v2)" + ENO);

                ok = false;
            }
        }
    }

    (void) usingv4l1;
#ifdef USING_V4L1
    if (usingv4l1)
    {
        LOG(VB_CHANNEL, LOG_INFO, LOC + msg + "(v4l v1)");

        // read in old settings
        struct video_channel set;
        memset(&set, 0, sizeof(set));
        ioctl(videofd, VIDIOCGCHAN, &set);

        // set new settings
        set.channel = inputNumV4L;
        set.norm    = format_to_mode(newFmt, 1);
        int ioctlval = ioctl(videofd, VIDIOCSCHAN, &set);

        ok = (ioctlval >= 0);
        if (!ok)
        {
            LOG(VB_GENERAL, LOG_ERR, LOC + msg +
                "\n\t\t\twhile setting format (v4l v1)" + ENO);
        }
        else if (usingv4l2)
        {
            LOG(VB_GENERAL, LOG_INFO, LOC + msg +
                "\n\t\t\tSetting video mode with v4l version 1 worked");
        }
    }
#endif // USING_V4L1

    return ok;
}

bool V4LChannel::SwitchToInput(int inputnum, bool setstarting)
{
    InputMap::const_iterator it = m_inputs.find(inputnum);
    if (it == m_inputs.end())
        return false;

    QString tuneFreqId = (*it)->tuneToChannel;
    QString channum    = (*it)->startChanNum;
    QString inputname  = (*it)->name;

    LOG(VB_CHANNEL, LOG_INFO, QString("Channel(%1)::SwitchToInput(in %2, '%3')")
            .arg(device).arg(inputnum)
            .arg(setstarting ? channum : QString("")));

    uint mplexid_restriction;
    if (!IsInputAvailable(inputnum, mplexid_restriction))
        return false;

    QString newFmt = mode_to_format((*it)->videoModeV4L2, 2);

    // If we are setting a channel, get its video mode...
    bool chanValid  = (channum != "Undefined") && !channum.isEmpty();
    if (setstarting && chanValid)
    {
        QString tmp = GetFormatForChannel(channum, inputname);
        if (tmp != "Default" && !tmp.isEmpty())
            newFmt = tmp;
    }

    bool ok = SetInputAndFormat(inputnum, newFmt);

    if (!ok)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "SetInputAndFormat() failed");
        return false;
    }

    currentFormat     = newFmt;
    m_currentInputID = inputnum;
    m_curchannelname    = ""; // this will be set by SetChannelByString

    if (!tuneFreqId.isEmpty() && tuneFreqId != "Undefined")
        ok = Tune(tuneFreqId, 0);

    if (!ok)
        return false;

    if (setstarting && chanValid)
        ok = SetChannelByString(channum);
    else if (setstarting && !chanValid)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC +
            QString("SwitchToInput(in %2, set ch): ").arg(inputnum) +
            QString("\n\t\t\tDefault channel '%1' is not valid.").arg(channum));
        ok = false;
    }

    return ok;
}

#ifdef USING_V4L1
static unsigned short *get_v4l1_field(
    int v4l2_attrib, struct video_picture &vid_pic)
{
    switch (v4l2_attrib)
    {
        case V4L2_CID_CONTRAST:
            return &vid_pic.contrast;
        case V4L2_CID_BRIGHTNESS:
            return &vid_pic.brightness;
        case V4L2_CID_SATURATION:
            return &vid_pic.colour;
        case V4L2_CID_HUE:
            return &vid_pic.hue;
        default:
            LOG(VB_GENERAL, LOG_ERR,
                QString("get_v4l1_field: invalid attribute argument %1")
                    .arg(v4l2_attrib));
    }
    return NULL;
}
#endif

static int get_v4l2_attribute(const QString &db_col_name)
{
    if ("brightness" == db_col_name)
        return V4L2_CID_BRIGHTNESS;
    else if ("contrast" == db_col_name)
        return V4L2_CID_CONTRAST;
    else if ("colour" == db_col_name)
        return V4L2_CID_SATURATION;
    else if ("hue" == db_col_name)
        return V4L2_CID_HUE;
    return -1;
}

bool V4LChannel::InitPictureAttribute(const QString db_col_name)
{
    if (!m_pParent)
        return false;

    int v4l2_attrib = get_v4l2_attribute(db_col_name);
    if (v4l2_attrib == -1)
        return false;

    int cfield = ChannelUtil::GetChannelValueInt(
        db_col_name, GetCurrentSourceID(), m_curchannelname);
    int sfield = CardUtil::GetValueInt(
        db_col_name, GetCardID());

    if ((cfield == -1) || (sfield == -1))
        return false;

    int field = (cfield + sfield) & 0xFFFF;

    QString loc = LOC +
        QString("InitPictureAttribute(%1): ").arg(db_col_name, 10);

    if (usingv4l2)
    {
        struct v4l2_control ctrl;
        struct v4l2_queryctrl qctrl;
        memset(&ctrl, 0, sizeof(ctrl));
        memset(&qctrl, 0, sizeof(qctrl));

        ctrl.id = qctrl.id = v4l2_attrib;
        if (ioctl(videofd, VIDIOC_QUERYCTRL, &qctrl) < 0)
        {
            LOG(VB_GENERAL, LOG_ERR, loc + "failed to query controls." + ENO);
            return false;
        }

        float new_range = qctrl.maximum - qctrl.minimum;
        float old_range = 65535 - 0;
        float scl_range = new_range / old_range;
        float dfl       = (qctrl.default_value - qctrl.minimum) / new_range;
        int   norm_dfl  = (0x10000 + (int)(dfl * old_range) - 32768) & 0xFFFF;

        if (pict_attr_default.find(db_col_name) == pict_attr_default.end())
        {
            if (device_name == "pcHDTV HD3000 HDTV")
            {
                pict_attr_default["brightness"] = 9830;
                pict_attr_default["contrast"]   = 39322;
                pict_attr_default["colour"]     = 45875;
                pict_attr_default["hue"]        = 0;
            }
            else
            {
                pict_attr_default[db_col_name] = norm_dfl;
            }
        }

        int dfield = pict_attr_default[db_col_name];
        field      = (cfield + sfield + dfield) & 0xFFFF;
        int value0 = (int) ((scl_range * field) + qctrl.minimum);
        int value1 = min(value0, (int)qctrl.maximum);
        ctrl.value = max(value1, (int)qctrl.minimum);

#if DEBUG_ATTRIB
        LOG(VB_CHANNEL, LOG_DEBUG, loc + QString(" %1\n\t\t\t"
                                                 "[%2,%3] dflt(%4, %5, %6)")
                .arg(value0).arg(qctrl.minimum, 5).arg(qctrl.maximum, 5)
                .arg(qctrl.default_value, 5).arg(dfl, 4, 'f', 2)
                .arg(norm_dfl));
#endif

        if (ioctl(videofd, VIDIOC_S_CTRL, &ctrl) < 0)
        {
            LOG(VB_GENERAL, LOG_ERR, loc + "failed to set controls" + ENO);
            return false;
        }

        return true;
    }

#ifdef USING_V4L1
    // V4L1
    unsigned short *setfield;
    struct video_picture vid_pic;
    memset(&vid_pic, 0, sizeof(vid_pic));

    if (ioctl(videofd, VIDIOCGPICT, &vid_pic) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR, loc + "failed to query controls." + ENO);
        return false;
    }
    setfield = get_v4l1_field(v4l2_attrib, vid_pic);

    if (!setfield)
        return false;

    *setfield = field;
    if (ioctl(videofd, VIDIOCSPICT, &vid_pic) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR, loc + "failed to set controls." + ENO);
        return false;
    }

    return true;
#else
    return false;
#endif
}

bool V4LChannel::InitPictureAttributes(void)
{
    return (InitPictureAttribute("brightness") &&
            InitPictureAttribute("contrast")   &&
            InitPictureAttribute("colour")     &&
            InitPictureAttribute("hue"));
}

int V4LChannel::GetPictureAttribute(PictureAttribute attr) const
{
    QString db_col_name = toDBString(attr);
    if (db_col_name.isEmpty())
        return -1;

    int cfield = ChannelUtil::GetChannelValueInt(
        db_col_name, GetCurrentSourceID(), m_curchannelname);
    int sfield = CardUtil::GetValueInt(
        db_col_name, GetCardID());
    int dfield = 0;

    if (pict_attr_default.find(db_col_name) != pict_attr_default.end())
        dfield = pict_attr_default[db_col_name];

    int val = (cfield + sfield + dfield) & 0xFFFF;

#if DEBUG_ATTRIB
    LOG(VB_CHANNEL, LOG_DEBUG,
        QString("GetPictureAttribute(%1) -> cdb %2 rdb %3 d %4 -> %5")
            .arg(db_col_name).arg(cfield).arg(sfield)
            .arg(dfield).arg(val));
#endif

    return val;
}

static int get_v4l2_attribute_value(int videofd, int v4l2_attrib)
{
    struct v4l2_control ctrl;
    struct v4l2_queryctrl qctrl;
    memset(&ctrl, 0, sizeof(ctrl));
    memset(&qctrl, 0, sizeof(qctrl));

    ctrl.id = qctrl.id = v4l2_attrib;
    if (ioctl(videofd, VIDIOC_QUERYCTRL, &qctrl) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "get_v4l2_attribute_value: failed to query controls (1)" + ENO);
        return -1;
    }

    if (ioctl(videofd, VIDIOC_G_CTRL, &ctrl) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "get_v4l2_attribute_value: failed to get controls (2)" + ENO);
        return -1;
    }

    float mult = 65535.0 / (qctrl.maximum - qctrl.minimum);
    return min(max((int)(mult * (ctrl.value - qctrl.minimum)), 0), 65525);
}

static int get_v4l1_attribute_value(int videofd, int v4l2_attrib)
{
  (void) videofd;
  (void) v4l2_attrib;
#ifdef USING_V4L1
    struct video_picture vid_pic;
    memset(&vid_pic, 0, sizeof(vid_pic));

    if (ioctl(videofd, VIDIOCGPICT, &vid_pic) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR, "get_v4l1_attribute_value: failed to get "
                                 "picture control (1)" + ENO);
        return -1;
    }

    unsigned short *setfield = get_v4l1_field(v4l2_attrib, vid_pic);
    if (setfield)
        return *setfield;
#endif
    return -1;
}

static int get_attribute_value(bool usingv4l2, int videofd, int v4l2_attrib)
{
    if (usingv4l2)
        return get_v4l2_attribute_value(videofd, v4l2_attrib);
    return get_v4l1_attribute_value(videofd, v4l2_attrib);
}

static int set_v4l2_attribute_value(int videofd, int v4l2_attrib, int newvalue)
{
    struct v4l2_control ctrl;
    struct v4l2_queryctrl qctrl;
    memset(&ctrl, 0, sizeof(ctrl));
    memset(&qctrl, 0, sizeof(qctrl));

    ctrl.id = qctrl.id = v4l2_attrib;
    if (ioctl(videofd, VIDIOC_QUERYCTRL, &qctrl) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "set_v4l2_attribute_value: failed to query control" + ENO);
        return -1;
    }

    float mult = (qctrl.maximum - qctrl.minimum) / 65535.0;
    ctrl.value = (int)(mult * newvalue + qctrl.minimum);
    ctrl.value = min(ctrl.value, qctrl.maximum);
    ctrl.value = max(ctrl.value, qctrl.minimum);

    if (ioctl(videofd, VIDIOC_S_CTRL, &ctrl) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "set_v4l2_attribute_value: failed to set control" + ENO);
        return -1;
    }

    return 0;
}

static int set_v4l1_attribute_value(int videofd, int v4l2_attrib, int newvalue)
{
#ifdef USING_V4L1
    unsigned short *setfield;
    struct video_picture vid_pic;
    memset(&vid_pic, 0, sizeof(vid_pic));

    if (ioctl(videofd, VIDIOCGPICT, &vid_pic) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "set_v4l1_attribute_value: failed to get picture control." + ENO);
        return -1;
    }
    setfield = get_v4l1_field(v4l2_attrib, vid_pic);
    if (newvalue != -1 && setfield)
    {
        *setfield = newvalue;
        if (ioctl(videofd, VIDIOCSPICT, &vid_pic) < 0)
        {
            LOG(VB_GENERAL, LOG_ERR, "set_v4l1_attribute_value: failed to set "
                                     "picture control." + ENO);
            return -1;
        }
    }
    else
    {
        // ???
        return -1;
    }

    return 0;
#else
    return -1;
#endif
}

static int set_attribute_value(bool usingv4l2, int videofd,
                               int v4l2_attrib, int newvalue)
{
    if (usingv4l2)
        return set_v4l2_attribute_value(videofd, v4l2_attrib, newvalue);
    return set_v4l1_attribute_value(videofd, v4l2_attrib, newvalue);
}

int V4LChannel::ChangePictureAttribute(
    PictureAdjustType type, PictureAttribute attr, bool up)
{
    if (!m_pParent)
        return -1;

    QString db_col_name = toDBString(attr);
    if (db_col_name.isEmpty())
        return -1;

    int v4l2_attrib = get_v4l2_attribute(db_col_name);
    if (v4l2_attrib == -1)
        return -1;

    // get the old attribute value from the hardware, this is
    // just a sanity check on whether this attribute exists
    if (get_attribute_value(usingv4l2, videofd, v4l2_attrib) < 0)
        return -1;

    int old_value = GetPictureAttribute(attr);
    int new_value = old_value + ((up) ? 655 : -655);

    // make sure we are within bounds (wrap around for hue)
    if (V4L2_CID_HUE == v4l2_attrib)
        new_value &= 0xffff;
    new_value = min(max(new_value, 0), 65535);

#if DEBUG_ATTRIB
    LOG(VB_CHANNEL, LOG_DEBUG,
        QString("ChangePictureAttribute(%1,%2,%3) cur %4 -> new %5")
            .arg(type).arg(db_col_name).arg(up)
            .arg(old_value).arg(new_value));
#endif

    // actually set the new attribute value on the hardware
    if (set_attribute_value(usingv4l2, videofd, v4l2_attrib, new_value) < 0)
        return -1;

    // tell the DB about the new attribute value
    if (kAdjustingPicture_Channel == type)
    {
        int adj_value = ChannelUtil::GetChannelValueInt(
            db_col_name, GetCurrentSourceID(), m_curchannelname);

        int tmp = new_value - old_value + adj_value;
        tmp = (tmp < 0)      ? tmp + 0x10000 : tmp;
        tmp = (tmp > 0xffff) ? tmp - 0x10000 : tmp;
        ChannelUtil::SetChannelValue(db_col_name, QString::number(tmp),
                                     GetCurrentSourceID(), m_curchannelname);
    }
    else if (kAdjustingPicture_Recording == type)
    {
        int adj_value = CardUtil::GetValueInt(
            db_col_name, GetCardID());

        int tmp = new_value - old_value + adj_value;
        tmp = (tmp < 0)      ? tmp + 0x10000 : tmp;
        tmp = (tmp > 0xffff) ? tmp - 0x10000 : tmp;
        CardUtil::SetValue(db_col_name, GetCardID(),
                           GetCurrentSourceID(), tmp);
    }

    return new_value;
}