Re: [CsMain] [GSOC 2013] Video recording support

Sorry, I forgot to link it: 
http://www.google-melange.com/gsoc/proposal/review/google/gsoc2013/logomorph/15002

Cheers,
Alin

On 27/4/2013 01:12, Alin Baciu wrote:
> Hello again,
>
> I have submitted my proposal. Any suggestions are welcome.
>
> Cheers,
> Alin
>
> On 26/4/2013 17:10, Alin Baciu wrote:
>> Hello,
>>
>> My name is Alin Baciu and I'm a 4'th year student at the Technical 
>> University of Cluj Napoca, Romania.
>> Some might remember me from GSOC 2011 where I implemented video 
>> decode support.
>>
>> I'm considering the video recording support project for this year's GSOC.
>>
>> I'm still studying the sound system and figuring out how I could get 
>> sound data from it, but I have a basic
>> flow for how video frames are to be recorded. I'm going to use theora.
>>
>> I'm thinking of using a render target FIFO queue. Basically, every 
>> few frames (considering the recording is at 30FPS)
>> this will happen:
>> 1. The renderer picks a render target from the front of the queue
>> 2. If the target is clean (has been processed and turned into a video 
>> frame) the process goes on
>> 2.1. If the target is dirty, that means there are no clean frames in 
>> the queue and either a new one is created,
>> or frames will be skipped until there's one available
>> 3. The scene is rendered on the target, which is then rendered on a quad
>> 4. The blit buffer is queried using QueryBlitBuffer, target is marked 
>> as dirty and is moved at the back of the queue.
>> Querying the blit buffer is important if we want an async recorder, 
>> since sharing textures between threads is too complicated.
>> 5. A separate thread picks the first dirty target from the queue, 
>> converts the data from the buffer to YUV and writes it to
>> a file.
>> 6. The processed target is marked as clean, so the renderer can use it.
>>
>> What do you think?
>> As far as I remember, it should be OK to share the buffer pointer 
>> between threads. so this should work pretty well.
>>
>> Cheers,
>> Alin
>> -- 
>> \------------------------/
>> Alin Baciu
>> /------------------------\
>> \------------------------/
>> AwkwardGames <http://awkwardgames.wordpress.com/>
>> /------------------------\
>> @Logomorph
>> \------------------------/
>>
>>
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