[FFmpeg-soc] libavfilter audio work - qualification task

[S.N. Hemanth Meenakshisundaram]

On 04/11/2010 03:57 AM, Michael Niedermayer wrote:
> On Fri, Apr 09, 2010 at 06:07:00PM -0700, S.N. Hemanth Meenakshisundaram wrote:
>    
>> On 04/09/2010 04:18 PM, Stefano Sabatini wrote:
>>      
>>> On date Friday 2010-04-09 08:02:50 -0700, S.N. Hemanth Meenakshisundaram
>>> encoded:
>>>
>>>        
>>>> On 04/08/2010 09:54 PM, S.N. Hemanth Meenakshisundaram wrote:
>>>>          
>> [...]
>>      
>>>> Index: vf_drawtext.c
>>>> ===================================================================
>>>> --- vf_drawtext.c	(revision 0)
>>>> +++ vf_drawtext.c	(revision 0)
>>>> @@ -0,0 +1,589 @@
>>>> +/*
>>>> + * vf_drawtext.c: print text over the screen
>>>> +
>>>> ******************************************************************************
>>>> + * Options:
>>>> + * -f<filename>      font filename (MANDATORY!!!)
>>>> + * -s<pixel_size>    font size in pixels [default 16]
>>>> + * -b               print background
>>>> + * -o               outline glyphs (use the bg color)
>>>> + * -x<pos>           x position (>= 0) [default 0]
>>>> + * -y<pos>           y position (>= 0) [default 0]
>>>> + * -t<text>          text to print (will be passed to strftime())
>>>> + *                  MANDATORY: will be used even when -T is used.
>>>> + *                  in this case, -t will be used if some error
>>>> + *                  occurs
>>>> + * -T<filename>      file with the text (re-read every frame)
>>>> + * -c<#RRGGBB>       foreground color ('internet' way) [default #ffffff]
>>>> + * -C<#RRGGBB>       background color ('internet' way) [default #000000]
>>>> + *
>>>> +
>>>> ******************************************************************************
>>>> + * Features:
>>>> + * - True Type, Type1 and others via FreeType2 library
>>>> + * - Font kerning (better output)
>>>> + * - Line Wrap (if the text doesn't fit, the next char go to the next
>>>> line)
>>>> + * - Background box
>>>> + * - Outline
>>>> +
>>>> ******************************************************************************
>>>>
>>>>          
>>> User-documentation for filters should be put in doc/libavfilter.texi,
>>> also I don't like this syntax, possibly we should try hard at giving a
>>> consistent interface to the user, so we should either use
>>> PARAM-1:PARAM-2:...:PARAM-N either use libavutil/parseutils.c (which
>>> still depends on opt.c so I don't believe Michail won't accept this to
>>> be included in the main repo, but that's not a problem for now).
>>>
>>>        
>> Am sorry for the confusion here. The syntax above is from the old vhook
>> drawtext file, the current syntax coded is :
>>
>> ffplay -vfilters
>> drawtext=f:<font_name>:t:<text>:T:<file_name>:s:<font_size>:x:<x_position>:y:<y_position>:c:<font_color>:C:<bg_color>:b:o
>> video.avi
>>      
> i think drawtext=f=<font_name>:t=<text>:T=<file_name...
> would be less error prone
>
> [...]
>    
>
>
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>    
Sure. I will change syntax as above and also make the changes Stefano 
indicated during this weekend after am done with yadif.

I had one (dumb?) question about yadif :

Since the PicRef structure in libavfilter has no 'fields' member, how do 
I find out if the image data in the buffer is MP_IMGFIELD_ORDERED, 
MP_IMGFIELD_TOP_FIRST etc. Is it indicated in the PixelFormat?

Thanks