Call mplayer in QT to display the video and add transparent text

Previously, I used the QT multi-media library phonon to play a video. It was also troublesome to use it for cross-platform playback. It is better to bring an mplayer to play the video directly. CPU usage is acceptable.

# Include <qapplication>

# Include <qtgui>

 

# Ifdef q_ws_win

Const qstring mplayerpath ("C: \ Program Files \ smplayer \ mplayer \ mplayer.exe ");

Const qstring moviefile ("C:/traffic. mpg ");

# Else

Const qstring mplayerpath ("/usr/bin/mplayer ");

Const qstring moviefile ("/home/Anderson/test. Avi ");

# Endif

 

Class maskedlabel: Public qlabel

{

Public:

Maskedlabel (qwidget * parent = 0): qlabel (parent)

{

}

 

Protected:

Void resizeevent (qresizeevent * event)

{

Qlabel: resizeevent (event );

 

Qpixmap pixmap (SIZE ());

Pixmap. Fill (QT: transparent );

Qpainter: setredirected (this, & pixmap );

Qpaintevent PE (rect ());

Paintevent (& PE );

Qpainter: restoreredirected (this );

Setmask (pixmap. Mask ());

}

};

 

Class playerwidget: Public qwidget

{

Q_object

 

Public:

Virtual ~ Playerwidget (){}

Playerwidget (qwidget * parent = 0): qwidget (parent)

{

Controller = new qpushbutton ("play ");

 

Rendertarget = new qwidget (this );

Rendertarget-> setsizepolicy (qsizepolicy: preferred, qsizepolicy: preferred ));

Rendertarget-> setattribute (QT: wa_opaquepaintevent );

Rendertarget-> setminimumsize (g00, g00 );

 

Timeline = new qslider (QT: horizontal );

 

Log = new qtextedit;

Log-> setreadonly (true );

 

Qvboxlayout * layout = new qvboxlayout;

Layout-> addwidget (Controller );

Layout-> addwidget (rendertarget );

Layout-> addwidget (timeline );

Layout-> addwidget (log );

Setlayout (layout );

 

Mplayerprocess = new qprocess (this );

 

Poller = new qtimer (this );

 

Connect (controller, signal (clicked (), this, slot (switchplaystate (); // switchplaystate is behind

Connect (mplayerprocess, signal (readyreadstandardoutput ()),

This, slot (catchoutput (); // catchoutput is behind

Connect (mplayerprocess, signal (finished (INT, qprocess: exitstatus )),

This, slot (mplayerended (INT, qprocess: exitstatus); // mplayerended

Connect (poller, signal (timeout (), this, slot (pollcurrenttime (); // pollcurrenttime is behind

Connect (timeline, signal (slidermoved (INT), this, slot (timelinechanged (INT); // timelinechanged is behind

 

Qlabel * label = new maskedlabel ();

Label-> settext ("<font color = \" # effece0 \ "size = \" 22 \ "> <B> 1now there was a man of the Pharisees named nicdemus, A member of the Jewish ruling councer. 2he came to Jesus at night and said, \ "Rabbi, we know you are a teacher who has come from God. for no one cocould perform the miraculous signs you are doing if God were not with him. \ "3in reply Jesus declared, \" I tell you the truth, no one can see th E kingdom of God unless he is born again. [a] \ "4 \" How can a man be born when he is old? \ "Nicdemus asked. \" Surely he cannot enter a second time into his mother's womb to be born! \ "</B> </font> ");

// Label-> setgeometry (rendertarget-> geometry ());

Label-> setwordwrap (true );

Label-> show ();

 

}

 

PRIVATE:

Qpushbutton * controller;

Qwidget * rendertarget;

Qprocess * mplayerprocess; // main thing

Bool isplaying;

Qslider * timeline;

Qtimer * poller;

Qtextedit * log;

 

 

Protected:

Void closeevent (qcloseevent * E)

{

Stopmplayer ();

E-> Accept ();

}

 

PRIVATE:

Bool startmplayer ()

{

If (isplaying)

Return true;

 

Qstringlist ARGs; // parameter required to run mplayer

 

// On demande? Utiliser mplayer comme backend

// Are asked to use mplayer as backend

ARGs <"-slave ";

// Et on veut ne pas avoir trop de chose? Parser

// And we want to not having too parse things to parser :)

ARGs <"-quiet ";

# Ifdef q_ws_win

// Reinterpret_cast obligatoire, winid () ne se laissant pas convertiogentiment

// Reinterpret_cast mandatory winid () not allowing convert nicely ;)

ARGs <"-wid" <qstring: Number (reinterpret_cast <long> (rendertarget-> winid ()));

ARGs <"-vo" <"DirectX: noaccel ";

// ARGs <"-nocache ";

// ARGs <"-framedrop ";

# Else

// Sur Linux, aucun driver n'a? T? N? Cessaire et pas de manip pour wid

// On Linux, no driver has been necessary and no manip for WID :)

ARGs <"-wid" <qstring: Number (rendertarget-> winid ());

 

Log-> append ("video output driver may not be necessary for your platform. Check: http://www.mplayerhq.hu/DOCS/man/en/mplayer.1.html at the video output drivers section .");

# Endif

 

ARGs <moviefile;

 

// On parse la stdout et stderr au M? Me endroit, donc On demande? "Fusionnner" Les 2 flux

// Parse the stdout and stderr in the same place, so we are asking "fusionnner"

Mplayerprocess-> setprocesschannelmode (qprocess: mergedchannels );

Mplayerprocess-> Start (mplayerpath, argS); // start the process

If (! Mplayerprocess-& gt; waitforstarted (100 ))

{

Qdebug ("can not start mplayer! ");

Return false;

}

 

// Retrieve Basic Information

Mplayerprocess-> write ("get_video_resolution ");

Mplayerprocess-> write ("get_time_length ");

 

Poller-> Start (0 );

 

Isplaying = true;

 

Return true;

}

 

Bool stopmplayer ()

{

If (! Isplaying)

Return true;

 

Mplayerprocess-> write ("quit ");

If (! Mplayerprocess-& gt; waitforfinished (100 ))

{

Qdebug ("zomg ,? A plante :(");

Return false;

}

 

Return true;

}

 

Private slots:

 

// Response to the readyreadstandardoutput message

Void catchoutput ()

{

While (mplayerprocess-> canreadline ())

{

Qbytearray buffer (mplayerprocess-> Readline ());

Log-> append (qstring (buffer ));

 

// On V? Rifie Si On A eu des R? Ponses

// It checks if we had answers

// R? Ponse? Get_video_resolution: ans_video_resolution = 'X'

// Response to get_video_resolution: ans_video_resolution

If (buffer. startswith ("ans_video_resolution "))

{

Buffer. Remove (0, 21); // vire ans_video_resolution =

Buffer. Replace (qbytearray ("'"), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Int sepindex = buffer. indexof ('x ');

Int resx = buffer. Left (sepindex). toint ();

Int Resy = buffer. mid (sepindex + 1). toint ();

Rendertarget-> setminimumsize (resx, Resy );

}

// R? Ponse? Get_time_length: ans_length = XX. yy

// Response to get_time_length: ans_length =

Else if (buffer. startswith ("ans_length "))

{

Buffer. Remove (0, 11); // vire ans_length =

Buffer. Replace (qbytearray ("'"), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Float maxtime = buffer. tofloat ();

Timeline-> setmaximum (static_cast <long> (maxtime + 1 ));

}

// R? Ponse? Get_time_pos: ans_time_position = XX. Y

// Response to get_time_pos: ans_time_position = 2.4

Else if (buffer. startswith ("ans_time_position "))

{

Buffer. Remove (0, 18); // vire ans_time_position =

Buffer. Replace (qbytearray ("'"), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Buffer. Replace (qbytearray (""), qbytearray (""));

Float currtime = buffer. tofloat ();

Timeline-> setvalue (static_cast <long> (currtime + 1 ));

}

// Qapp-> processevents ();

}

}

 

Void pollcurrenttime ()

{

Mplayerprocess-> write ("get_time_pos ");

}

 

// Dirige la timeline

// Directs the timeline

Void timelinechanged (int pos)

{

Mplayerprocess-> write (qstring ("Seek" + qstring: Number (POS) + "2"). toutf8 ());

}

 

// Play/stop

Void switchplaystate ()

{

If (! Isplaying)

{

If (! Startmplayer ())

Return;

 

Log-> clear ();

Controller-> settext ("stop ");

Isplaying = true;

}

Else

{

If (! Stopmplayer ())

Return;

 

Poller-> stop ();

Log-> clear ();

Controller-> settext ("play ");

Isplaying = false;

}

}

 

Void mplayerended (INT exitcode, qprocess: exitstatus)

{

Isplaying = false;

Controller-> settext ("play ");

Poller-> stop ();

}

 

 

};

 

Int main (INT argc, char ** argv)

{

Qapplication app (argc, argv );

 

Playerwidget * PW = new playerwidget;

PW-> show ();

 

Return app.exe C ();

}

 

# Include "Hello. MOC"