Qt+gstreamer 视频播放器

#include "widget.h" #include <QDebug> #include <QFileDialog> #include <QMessageBox> #include <QToolButton> #include <QStyle> void Widget::handle_message (CustomData *data, GstMessage *msg) { GError *err; gchar *debug_info; switch (GST_MESSAGE_TYPE (msg)) { case GST_MESSAGE_ERROR: gst_message_parse_error (msg, &err, &debug_info); qCritical() << "Error received from element " << QString(GST_OBJECT_NAME (msg->src)) << ":" << QString(err->message); qCritical() << "Debugging information:" << QString(debug_info); g_clear_error (&err); g_free (debug_info); if(queryTimer->isActive()) { queryTimer->stop(); } break; case GST_MESSAGE_EOS: qInfo ("End-Of-Stream reached.\n"); if(queryTimer->isActive()) { queryTimer->stop(); } break; case GST_MESSAGE_DURATION: data->duration = GST_CLOCK_TIME_NONE; break; case GST_MESSAGE_STATE_CHANGED: { GstState old_state, new_state, pending_state; gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state); qInfo() << "GST_MESSAGE_STATE_CHANGED is called!!!"; if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin2)) { g_print ("Pipeline state changed from %s to %s:\n",gst_element_state_get_name (old_state), gst_element_state_get_name (new_state)); /* Remember whether we are in the PLAYING state or not */ data->playing = (data->playbin2->current_state == GST_STATE_PLAYING); if (data->playing) { /* We just moved to PLAYING. Check if seeking is possible */ qInfo() << "data->playing is called!!"; GstQuery *query; gint64 start, end; query = gst_query_new_seeking (GST_FORMAT_TIME); if (gst_element_query (data->playbin2, query)) { gst_query_parse_seeking (query, NULL, &data->seek_enabled, &start, &end); if (data->seek_enabled) { g_print ("Seeking is ENABLED from %" GST_TIME_FORMAT " to %" GST_TIME_FORMAT "\n", GST_TIME_ARGS (start), GST_TIME_ARGS (end)); } else { g_print ("Seeking is DISABLED for this stream.\n"); } } else { g_printerr ("Seeking query failed."); } gst_query_unref (query); } } } break; default: /* We should not reach here */ g_printerr ("Unexpected message received.\n"); break; } gst_message_unref (msg); } Widget::Widget(QWidget *parent) : QWidget(parent) { data = new CustomData; muteFlag = true; /* Initialize our data structure */ memset (data, 0, sizeof (CustomData)); data->duration = GST_CLOCK_TIME_NONE; /* Create the elements */ data->playbin2 = gst_element_factory_make ("playbin", "playbin2"); if (!data->playbin2) { qWarning("Not all elements could be created.\n"); return ; } /* Set the URI to play */ g_object_set(data->playbin2, "uri", uri.toUtf8().data(), NULL); /* Create the GUI */ createUi(data); /* Instruct the bus to emit signals for each received message, and connect to the interesting signals */ bus = gst_element_get_bus (data->playbin2); queryTimer = new QTimer; connect(queryTimer,SIGNAL(timeout()),this,SLOT(slotTimerout())); } void Widget::slotTimerout() { GstMessage *msg; msg = gst_bus_timed_pop_filtered (data->bus, GST_CLOCK_TIME_NONE, GstMessageType(GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS | GST_MESSAGE_DURATION)); /* Parse message */ if (msg != NULL) { qInfo() << "msg != NULL"; handle_message (data, msg); } refresh_ui(data); expose_cb(displayWnd,NULL,data); analyze_streams(data); } Widget::~Widget() { } void Widget::closeEvent(QCloseEvent *) { if(queryTimer->isActive()) { queryTimer->stop(); } delete_event_cb(NULL,NULL,data); /* Free resources */ gst_element_set_state (data->playbin2, GST_STATE_NULL); gst_object_unref (data->playbin2); if(data != NULL) { delete data; data = NULL; } } /* This function is called when the GUI toolkit creates the physical window that will hold the video. * At this point we can retrieve its handler (which has a different meaning depending on the windowing system) * and pass it to GStreamer through the XOverlay interface. */ void Widget::realize_cb(QWidget *widget, CustomData *data) { guintptr window_handle; window_handle = (guintptr)(widget->winId()); gst_video_overlay_set_window_handle(GST_VIDEO_OVERLAY(data->playbin2),window_handle); } /*This funcion is called when the PLAY button is clicked!*/ void Widget::playButtonClicked(QPushButton *button, CustomData *data) { Q_UNUSED(button); GstStateChangeReturn ret; ret = gst_element_set_state (data->playbin2, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) { g_printerr ("Unable to set the pipeline to the playing state.\n"); gst_object_unref (data->playbin2); QMessageBox::information(this,tr("提示"),tr("文件无法渲染!"),1); data->playbin2 = gst_element_factory_make ("playbin", "playbin2"); realize_cb(displayWnd,data); if (!data->playbin2) { qWarning("Not all elements could be created.\n"); return ; } return; } else { if(!queryTimer->isActive()) { queryTimer->start(100*3); } } g_object_set(G_OBJECT(data->playbin2), "volume", 50*1.0/100, NULL); g_object_set(G_OBJECT(data->playbin2), "mute", FALSE, NULL); } /* This function is called when the PAUSE button is clicked */ void Widget::plauseButtonClicked(QPushButton *button, CustomData *data) { Q_UNUSED(button); if(uri == "") { return; } GstStateChangeReturn ret; ret = gst_element_set_state(data->playbin2,GST_STATE_PAUSED); if (ret == GST_STATE_CHANGE_FAILURE) { g_printerr ("Unable to set the pipeline to the plauseing state.\n"); gst_object_unref (data->playbin2); QMessageBox::information(this,tr("提示"),tr("暂停操作失败!"),1); data->playbin2 = gst_element_factory_make ("playbin", "playbin2"); realize_cb(displayWnd,data); if (!data->playbin2) { qWarning("Not all elements could be created.\n"); return ; } return; } } /* This function is called when the STOP button is clicked */ void Widget::stopButtonClicked(QPushButton *button, CustomData *data) { Q_UNUSED(button); if(uri == "") { return; } GstStateChangeReturn ret; if(data != NULL && data->playbin2 != NULL) { ret = gst_element_set_state (data->playbin2, GST_STATE_READY); ; if (ret == GST_STATE_CHANGE_FAILURE) { g_printerr ("Unable to set the pipeline to the stopping state.\n"); gst_object_unref (data->playbin2); return; } else { startBtn->setText("播放"); } } } /* This function is called when the main window is closed */ void Widget::delete_event_cb(QWidget *widget, QEvent *event, CustomData *data) { Q_UNUSED(widget); Q_UNUSED(event); if(data != NULL) { stopButtonClicked(NULL,data); } } /* This function is called everytime the video window needs to be redrawn (due to damage/exposure, * rescaling, etc). GStreamer takes care of this in the PAUSED and PLAYING states, otherwise, * we simply draw a black rectangle to avoid garbage showing up. */ bool Widget::expose_cb(QWidget *widget, QEvent *eve