[MPlayer-dev-eng] libvo2 under way

[David Holm]

Arpi wrote:

>Hi,
>
>first: please don't cross-posts more!
>
>about libvo2.
>1. please read my 'long' mail about it, which i've sent it about a week ago.
>  i don't want to see the base ideas disappearing.
>
ok, will do, must've missed it. don't worry, I'll not chear any base 
ideas out of it...

>
>2. wait with that plugin gui stuff. we should get working libvo2 first, gui
>dosn't matter now.
>
Yeah I know... I just pointed it out to attract users attention

>
>
>>Hi,
>>I just got permission from Arpi to take charge of libvo2 development. As 
>>some of you know libvo2 focuses more on the hardware used than just 
>>being a mere mplayer<->hardware implementation. I'm thinking of features 
>>as query_format() in libvo where you had to have support for n different 
>>formats for the device to be usable. In libvo2 we are going to approach 
>>this problem in a whole different way, we are going to tell mplayer 
>>which format(s) out device supports.
>>Say for instance you are writing a device for a hardware mpeg decoder 
>>(such as I am for the dxr3/h+), in libvo you will have to implement alot 
>>of different converters to get the output you requier. In libvo2 we tell 
>>mplayer that (in the case of the dxr3) we want mpegpes packets for video 
>>playback, making it up to mplayer to convert the stream to the 
>>appropriate format. This produces a number of extremely useful features 
>>say encoder X encodes an mpeg1 stream 12% faster than encoder Y using 
>>input format K, then mplayer could automatically choose X for the job.
>>Another feature of libvo2 will be overlays/raw output, this is mostly a 
>>movement towards a pluggable gui where the developer designs the gui and 
>>it's functionality, not just the theme. Why raw output you might ask 
>>when mplayer already converts K to X? Well, alot of cards have a number 
>>of acceleration options, again referring to the DXR3 (it's an MPEG-1, 
>>MPEG-2 AC3 hardware decoder card for those of you not familiar with it) 
>>uses an overlay cable to produce output on your monitor, meaning that it 
>>will put 0% load on the video board, also when playing mpeg-(1/2) you 
>>will have a VERY low cpu-usage. Other cards might support hardware 
>>scaling, pixel conversion and so on, the list goes on.
>>
>>What I need from both you the developers and you the users are any 
>>thoughts, ideas, (scanned) napkins with scribbles on them. As 
>>development moves along I will post info on changes, features etc. I 
>>will also make cvs commits whenever reaching a point where I think a 
>>reasonable amount of new features have been implemented (I will do my 
>>best to document the api along the road, there will also be a "Moving 
>>from libvo to libvo2" book available from O'Reilly Publ.... just 
>>kidding, but I'll try to put together an easy to use libvo->libvo2 guide 
>>for you.
>>If I get no feedback either by ideas, or by reading my code I will 
>>assume you cannot come up with a more genious way of solving that 
>>particular problem. Remember, it's up to you to help me and the other 
>>developers make this a better product, and move to a pluggable gui-api 
>>which I personally am looking forward to.
>>
>>Well, it's getting late here in sweden, and I have had my first look at 
>>the current libvo2 status, and read through the cvs-howto. But now I 
>>really have to go to bed, but expect development moving at a high pace, 
>>but libvo2 will not be finalized (standardized) until "significant" 
>>people have had a look at it and found it flawless, so it's not like you 
>>have until the upcoming weekend to come with ideas etc.
>>
>>Sleep tight
>>//David Holm
>>
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>>
>>
>
>
>A'rpi / Astral & ESP-team
>
>--
>mailto:arpi at thot.banki.hu
>http://esp-team.scene.hu
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