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    40 ****************************************************************************/

    41 

    42 #include "qgstreamerv4l2input.h"

    43 

    44 #include <QtCore/qdebug.h>

    45 #include <QtCore/qfile.h>

    46 

    47 #include <linux/types.h>

    48 #include <sys/time.h>

    49 #include <sys/ioctl.h>

    50 #include <sys/poll.h>

    51 #include <unistd.h>

    52 #include <fcntl.h>

    53 #include <errno.h>

    54 #include <string.h>

    55 #include <stdlib.h>

    56 #include <sys/mman.h>

    57 #include <linux/videodev2.h>

    58 

    59 QT_BEGIN_NAMESPACE

    60 static inline uint qHash(const QSize& key) { return uint(key.width()*256+key.height()); }

    61 

    62 static bool operator<(const QSize &s1, const QSize s2)

    63 {

    64     return s1.width()*s1.height() < s2.width()*s2.height();

    65 }

    66 QT_END_NAMESPACE

    67 

    68 QGstreamerV4L2Input::QGstreamerV4L2Input(QObject *parent)

    69     :QObject(parent)

    70 {

    71 }

    72 

    73 QGstreamerV4L2Input::~QGstreamerV4L2Input()

    74 {

    75 }

    76 

    77 GstElement *QGstreamerV4L2Input::buildElement()

    78 {

    79 #ifndef Q_WS_MAEMO_5

    80     GstElement *camera = gst_element_factory_make("v4l2src", "camera_source");

    81 #else

    82     GstElement *camera = gst_element_factory_make("v4l2camsrc", "camera_source");

    83 #endif

    84     if (camera && !m_device.isEmpty() )

    85         g_object_set(G_OBJECT(camera), "device", m_device.constData(), NULL);

    86 

    87     return camera;

    88 }

    89 

    90 void QGstreamerV4L2Input::setDevice(const QByteArray &newDevice)

    91 {

    92     if (m_device != newDevice) {

    93         m_device = newDevice;

    94         updateSupportedResolutions(newDevice);

    95     }

    96 }

    97 

    98 void QGstreamerV4L2Input::setDevice(const QString &device)

    99 {

   100     setDevice(QFile::encodeName(device));

   101 }

   102 

   103 void QGstreamerV4L2Input::updateSupportedResolutions(const QByteArray &device)

   104 {

   105     m_frameRates.clear();

   106     m_resolutions.clear();

   107     m_ratesByResolution.clear();

   108 

   109     QSet<QSize> allResolutions;

   110     QSet<int> allFrameRates;

   111 

   112     QFile f(device);

   113 

   114     if (!f.open(QFile::ReadOnly))

   115         return;

   116 

   117     int fd = f.handle();

   118 

   119     //get the list of formats:

   120     QList<quint32> supportedFormats;

   121 

   122     {

   123         v4l2_fmtdesc fmt;

   124         memset(&fmt, 0, sizeof(v4l2_fmtdesc));

   125 

   126         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

   127         int sanity = 0;

   128 

   129         for (fmt.index = 0;; fmt.index++) {

   130             if (sanity++ > 8)

   131                 break;

   132             if(  ::ioctl(fd, VIDIOC_ENUM_FMT, &fmt) == -1) {

   133                 if(errno == EINVAL)

   134                     break;

   135             }

   136             supportedFormats.append(fmt.pixelformat);

   137         }

   138     }

   139 

   140     QList<QSize> commonSizes;

   141     commonSizes << QSize(128, 96)

   142             <<QSize(160,120)

   143             <<QSize(176, 144)

   144             <<QSize(320, 240)

   145             <<QSize(352, 288)

   146             <<QSize(640, 480)

   147             <<QSize(1024, 768)

   148             <<QSize(1280, 1024)

   149             <<QSize(1600, 1200)

   150             <<QSize(1920, 1200)

   151             <<QSize(2048, 1536)

   152             <<QSize(2560, 1600)

   153             <<QSize(2580, 1936);

   154 

   155     QList<int> commonRates;

   156     commonRates << 05*1000 << 75*1000  << 10*1000 << 15*1000 << 20*1000

   157             << 24*1000 << 25*1000 << 30*1000 << 50*1000 << 60*1000;

   158 

   159 

   160     //get the list of resolutions:

   161 

   162     foreach (quint32 format, supportedFormats) {

   163         struct v4l2_frmsizeenum formatSize;

   164         memset(&formatSize, 0, sizeof(formatSize));

   165         formatSize.pixel_format = format;

   166 

   167         QList<QSize> sizeList;

   168 

   169         if (0) {

   170             char formatStr[5];

   171             memcpy(formatStr, &format, 4);

   172             formatStr[4] = 0;

   173             //qDebug() << "trying format" << formatStr;

   174         }

   175 

   176         for (int i=0;;i++) {

   177             formatSize.index = i;

   178             if (ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &formatSize) < 0)

   179                 break;

   180 

   181             if (formatSize.type == V4L2_FRMSIZE_TYPE_DISCRETE) {

   182                 sizeList.append(QSize(formatSize.discrete.width, formatSize.discrete.height));

   183             } else {

   184 

   185                 foreach (const QSize& candidate, commonSizes) {

   186                     if (candidate.width() <= (int)formatSize.stepwise.max_width &&

   187                         candidate.height() >= (int)formatSize.stepwise.min_width &&

   188                         candidate.width() % formatSize.stepwise.step_width == 0 &&

   189                         candidate.height() <= (int)formatSize.stepwise.max_height &&

   190                         candidate.height() >= (int)formatSize.stepwise.min_height &&

   191                         candidate.height() % formatSize.stepwise.step_height == 0) {

   192                         sizeList.append(candidate);

   193                     }

   194                 }

   195 

   196                 if (!sizeList.contains(QSize(formatSize.stepwise.min_width, formatSize.stepwise.min_height)))

   197                     sizeList.prepend(QSize(formatSize.stepwise.min_width, formatSize.stepwise.min_height));

   198 

   199                 if (!sizeList.contains(QSize(formatSize.stepwise.max_width, formatSize.stepwise.max_height)))

   200                     sizeList.append(QSize(formatSize.stepwise.max_width, formatSize.stepwise.max_height));

   201 

   202                 break; //stepwise values are returned only for index 0

   203             }

   204 

   205         }

   206 

   207         //and frameRates for each resolution.

   208 

   209         foreach (const QSize &s, sizeList) {

   210             allResolutions.insert(s);

   211 

   212             struct v4l2_frmivalenum formatInterval;

   213             memset(&formatInterval, 0, sizeof(formatInterval));

   214             formatInterval.pixel_format = format;

   215             formatInterval.width = s.width();

   216             formatInterval.height = s.height();

   217 

   218             QList<int> frameRates; //in 1/1000 of fps

   219 

   220             for (int i=0; ; i++) {

   221                 formatInterval.index = i;

   222 

   223                 if (ioctl(fd, VIDIOC_ENUM_FRAMEINTERVALS, &formatInterval) < 0)

   224                     break;

   225 

   226                 if (formatInterval.type == V4L2_FRMIVAL_TYPE_DISCRETE) {

   227                     //converts seconds to fps*1000

   228                     if (formatInterval.discrete.numerator)

   229                         frameRates.append(qRound(formatInterval.discrete.denominator*1000.0 / formatInterval.discrete.numerator));

   230                 } else {

   231                     if (formatInterval.stepwise.min.numerator == 0 ||

   232                         formatInterval.stepwise.max.numerator == 0) {

   233                         qWarning() << "received invalid frame interval";

   234                         break;

   235                     }

   236 

   237 

   238                     int minRate = qRound(formatInterval.stepwise.min.denominator*1000.0 /

   239                                          formatInterval.stepwise.min.numerator);

   240 

   241                     int maxRate = qRound(formatInterval.stepwise.max.denominator*1000.0 /

   242                                          formatInterval.stepwise.max.numerator);

   243 

   244 

   245                     foreach (int candidate, commonRates) {

   246                         if (candidate >= minRate && candidate <= maxRate)

   247                             frameRates.append(candidate);

   248                     }

   249 

   250                     if (!frameRates.contains(minRate))

   251                         frameRates.prepend(minRate);

   252 

   253                     if (!frameRates.contains(maxRate))

   254                         frameRates.append(maxRate);

   255 

   256                     break; //stepwise values are returned only for index 0

   257                 }

   258             }

   259             allFrameRates.unite(frameRates.toSet());

   260             m_ratesByResolution[s].unite(frameRates.toSet());

   261         }

   262     }

   263 

   264     f.close();

   265 

   266     foreach(int rate, allFrameRates) {

   267         m_frameRates.append(rate/1000.0);

   268     }

   269 

   270     qSort(m_frameRates);

   271 

   272     m_resolutions = allResolutions.toList();

   273     qSort(m_resolutions);

   274 

   275     //qDebug() << "frame rates:" << m_frameRates;

   276     //qDebug() << "resolutions:" << m_resolutions;

   277 }

   278 

   279 

   280 QList<qreal> QGstreamerV4L2Input::supportedFrameRates(const QSize &frameSize) const

   281 {

   282     if (frameSize.isEmpty())

   283         return m_frameRates;

   284     else {

   285         QList<qreal> res;

   286         foreach(int rate, m_ratesByResolution[frameSize]) {

   287             res.append(rate/1000.0);

   288         }

   289         return res;

   290     }

   291 }

   292 

   293 QList<QSize> QGstreamerV4L2Input::supportedResolutions(qreal frameRate) const

   294 {

   295     Q_UNUSED(frameRate);

   296     return m_resolutions;

   297 }