Video Stream, extending QIODevice

[rextr]

Hello,

I keep videos in oracle in BFILE (actually a pointer to video). Then I can reach the video binary stream from BFILE, using BFILE's getBinaryStream() function.

What I want to do is play this video in Qt, VideoPlayer. I see that, MediaSource object can get QIODevice as argument, so I think I should extend QIODevice.

Is there any example that I can examine how to subclass QIODevice? First of all, which functions do I have to override? How to implement readData() espacially?

Thanks in advance ...

[mcosta]

You can convert you binary data in QByteArray then use a QBuffer as source of Phonon::MediaSource
Example

QByteArray bArray(yourData, dataSize);
QBuffer buffer(&bArray);
 
player->load(MediaSource(&buffer));
player->play();

QByteArray bArray(yourData, dataSize);
QBuffer buffer(&bArray);

player->load(MediaSource(&buffer));
player->play();

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[rextr]

Thank you, I had tried that method, but it fails with 400mb vidoes. When I try with a 20 mb video, it plays the sound but there is no display.

Here is the code:

byte[] bytes = bfile.getBytes(1, (int)length);
QBuffer buffer = new QBuffer(new QByteArray(bytes));
source = new MediaSource(buffer);
player.play(source);

byte[] bytes = bfile.getBytes(1, (int)length);
QBuffer buffer = new QBuffer(new QByteArray(bytes));
source = new MediaSource(buffer);
player.play(source);

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Even if this method works, it's still too slow since it needs all the video in memory before starting to play. That's why I need streaming. Thanks again for your interest...

[rextr]

Is there any way to achieve streaming with/without QIODevice?