video player 的解碼實現

原創 zzf0707 2020-06-28 05:49

Message 1 in thread

Hi All

Can anyone please tell me how to make a video
 player

ONLY using QT .. such that it will read a raw video
(or encoded data)

from a file/buffer and render it on screen of a device which doesnot

has X or open gl  or gtk support ???


any small sample will be really helpfull

Thanks


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Message 2 in thread

Em Monday 01 October 2007 14:53:22 karmendra jain escreveu:

> Hi All

> Can anyone please tell me how to make a video
 player

> ONLY using QT .. such that it will read a raw video
(or encoded data)

> from a file/buffer and render it on screen of a device which doesnot

> has X or open gl  or gtk support ???

>

> any small sample will be really helpfull


Take a look at the example that is bundled with Qt:
http://doc.trolltech.com/main-snapshot/widgets-movie.html



It's in your source package as examples/widgets/movie


It requires a running output display. If you're using Qt/X11, then it requires 

X11. But it won't require OpenGL.


Finally, note that this example is just about showing what you can do with 

simple classes. It is not a full-fledged movie player. It will read only what 

image-formats Qt knows about -- in a standard build, that will be GIF and 

MNG. That's enough for simple animations (like animated icons, progress 

information, etc.), but trying to render a 320x240 30fps movie might take its 

toll.


If you want more, you'll have to wait for Qt 4.4.


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Message 3 in thread

Thiago Macieira schrieb:

> > ...

> If you want more, you'll have to wait for Qt 4.4.


Hmmm, now I'm curious: I've heard that WebKit will be included, which is 

a good thing. So what does the rumour say about the media support in Qt 

4.4? Any secrets and insider infos you want to share with us? :)


Cheers, Oliver


--

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Message 4 in thread

Quoting Till Oliver Knoll <oliver.knoll@xxxxxxxxxxx>:


> Thiago Macieira schrieb:

>>> ...

>> If you want more, you'll have to wait for Qt 4.4.

>

> Hmmm, now I'm curious: I've heard that WebKit will be included, which

> is a good thing. So what does the rumour say about the media support in

> Qt 4.4? Any secrets and insider infos you want to share with us? :)


It's not a secret if you follow the KDE 4.0 development process:  

Phonon will be part of Qt 4.4 and KDE 4.0.


You can download the current (development) version from the KDE  

Subversion repository (web access:  
http://websvn.kde.org/trunk/KDE/kdelibs/phonon/
)


The main website (quite outdated) is http://phonon.kde.org
 and you can  

find Phonon's main author in #phonon in FreeNode.



-- 

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Message 5 in thread

Can anythin be done in qt 3.3 ????

there was a kiosk /mpeg player kiosk [Qt/Embedded-specific]

    An MPEG player.

in lot of places but i never found the code for it ...

can anyone help in this ???


On 10/1/07, Pau Garcia i Quiles <pgquiles@xxxxxxxxxxx> wrote:

> Quoting Till Oliver Knoll <oliver.knoll@xxxxxxxxxxx>:

>

> > Thiago Macieira schrieb:

> >>> ...

> >> If you want more, you'll have to wait for Qt 4.4.

> >

> > Hmmm, now I'm curious: I've heard that WebKit will be included, which

> > is a good thing. So what does the rumour say about the media support in

> > Qt 4.4? Any secrets and insider infos you want to share with us? :)

>

> It's not a secret if you follow the KDE 4.0 development process:

> Phonon will be part of Qt 4.4 and KDE 4.0.

>

> You can download the current (development) version from the KDE

> Subversion repository (web access:

> http://websvn.kde.org/trunk/KDE/kdelibs/phonon/
)

>

> The main website (quite outdated) is http://phonon.kde.org
 and you can

> find Phonon's main author in #phonon in FreeNode.

>

>

> --

> Pau Garcia i Quiles

> http://www.elpauer.org


> (Due to my workload, I may need 10 days to answer)

>

> --

> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.

> List archive and information: http://lists.trolltech.com/qt-interest/


>

>


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Message 6 in thread

Thanks guys

and yes i saw that example .. but its only for gif files and it requires X11 ..

but i'll explain my problem in detail


currently i was tryin to make a player .. back end gstreamer .. front end QT

on a board which doesnot support x11

now backend is ready .. it gives a decoded framer buffer .. which i

can write to a file


now how can i do things in QT ..

Ie use some buffer and display the movie decoded by the gstreamer ???

and on top of this .. i dont have X11 support on that board :(


ne help ppl ??


On 10/1/07, Till Oliver Knoll <oliver.knoll@xxxxxxxxxxx> wrote:

> Thiago Macieira schrieb:

> > > ...

> > If you want more, you'll have to wait for Qt 4.4.

>

> Hmmm, now I'm curious: I've heard that WebKit will be included, which is

> a good thing. So what does the rumour say about the media support in Qt

> 4.4? Any secrets and insider infos you want to share with us? :)

>

> Cheers, Oliver

>

> --

> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.

> List archive and information: http://lists.trolltech.com/qt-interest/


>

>


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Message 7 in thread

On 01.10.07 19:28:22, karmendra jain wrote:

> Thanks guys

> and yes i saw that example .. but its only for gif files and it requires X11 ..

> but i'll explain my problem in detail

> 

> currently i was tryin to make a player .. back end gstreamer .. front end QT

> on a board which doesnot support x11

> now backend is ready .. it gives a decoded framer buffer .. which i

> can write to a file

> 

> now how can i do things in QT ..

> Ie use some buffer and display the movie decoded by the gstreamer ???

> and on top of this .. i dont have X11 support on that board :(


Then you can't run Qt anyway, you can run Qtopia
 though. Other than that

neither Qt nor Qtopia
 have any support for decoding video
 data and

displaying it, so you'd have to write your own decoder and use QPainter

to display the data that you decode.


Andreas


-- 

 [ signature omitted ]

Message 8 in thread

  • Subject: Re: a simple video player on qt
  • From: "karmendra jain" <karmendra.jain@xxxxxxxxx >
  • Date: Mon, 1 Oct 2007 19:55:29 +0530
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Hey yes yes

i have written a decoder that decodes the data and provides the decoded frame

but how to use painter to 
get
 the desired result ???

1: where to pass the pointer of the deocded frame

2:  how to maintain the decoder and the painter in sink ??


is there any sample code that can help ???



On 10/1/07, Andreas Pakulat <apaku@xxxxxx> wrote:

> On 01.10.07 19:28:22, karmendra jain wrote:

> > Thanks guys

> > and yes i saw that example .. but its only for gif files and it requires X11 ..

> > but i'll explain my problem in detail

> >

> > currently i was tryin to make a player .. back end gstreamer .. front end QT

> > on a board which doesnot support x11

> > now backend is ready .. it gives a decoded framer buffer .. which i

> > can write to a file

> >

> > now how can i do things in QT ..

> > Ie use some buffer and display the movie decoded by the gstreamer ???

> > and on top of this .. i dont have X11 support on that board :(

>

> Then you can't run Qt anyway, you can run Qtopia
 though. Other than that

> neither Qt nor Qtopia
 have any support for decoding video
 data and

> displaying it, so you'd have to write your own decoder and use QPainter

> to display the data that you decode.

>

> Andreas

>

> --

> Avert misunderstanding by calm, poise, and balance.

>

> --

> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.

> List archive and information: http://lists.trolltech.com/qt-interest/


>

>


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Message 9 in thread

QPainter has a method called drawImage. You can do something like the 

following in a subclass of QWidget:




void VideoWidget::paintEvent()

{

//Get
 the current frame and size data...


//Passing QImage

QImage frame(frameDataUCharPtr, frameWidth, frameHeight. 

QImage::Format_RBG32 );


QPainter painter(this);

painter.drawImage(rect(), frame);


}


Under Qtopia
 you can use QDirectPainter to write directly to framebuffer 


memory and get
 some faster access for drawing frames. You will have to 

do the color conversions yourself to get
 the frame into your 

framebuffer's color model.


--Justin


karmendra jain wrote:

> Hey yes yes

> i have written a decoder that decodes the data and provides the decoded frame

> but how to use painter to get
 the desired result ???

> 1: where to pass the pointer of the deocded frame

> 2:  how to maintain the decoder and the painter in sink ??

>

> is there any sample code that can help ???

>

> On 10/1/07, Andreas Pakulat <apaku@xxxxxx> wrote:

>   

>> On 01.10.07 19:28:22, karmendra jain wrote:

>>     

>>> Thanks guys

>>> and yes i saw that example .. but its only for gif files and it requires X11 ..

>>> but i'll explain my problem in detail

>>>

>>> currently i was tryin to make a player .. back end gstreamer .. front end QT

>>> on a board which doesnot support x11

>>> now backend is ready .. it gives a decoded framer buffer .. which i

>>> can write to a file

>>>

>>> now how can i do things in QT ..

>>> Ie use some buffer and display the movie decoded by the gstreamer ???

>>> and on top of this .. i dont have X11 support on that board :(

>>>       

>> Then you can't run Qt anyway, you can run Qtopia
 though. Other than that

>> neither Qt nor Qtopia
 have any support for decoding video
 data and

>> displaying it, so you'd have to write your own decoder and use QPainter

>> to display the data that you decode.

>>

>> Andreas

>>

>> --

>> Avert misunderstanding by calm, poise, and balance.

>>

>> --

>> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.

>> List archive and information: http://lists.trolltech.com/qt-interest/


>>

>>

>>     

>

> --

> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.

> List archive and information: http://lists.trolltech.com/qt-interest/


>   

begin:vcard
begin:vcard

fn:Justin Noel

n:Noel;Justin

org:ICS;Engineering

adr:;;54B Middlesex Trpk;Bedford;MA;01730;USA

email;internet:justin@xxxxxxx

title:Sr. Consulting Engineer / Certified Qt Instructor

tel;work:(617) 621-0060

url:http://www.ics.com


version:2.1

end:vcard

 

 原文地址 http://lists.trolltech.com/qt-interest/2007-10/thread00007-0.html

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