On Mar 11, 2014, at 5:03 PM, wm4 <[email protected]> wrote:
> On Mon, 10 Mar 2014 18:32:54 -0700
> Ricky Huang <[email protected]> wrote:
>
>>>>> AVFilterBufferRef *cur_pic = link->cur_buf;
>>>>> uint8_t *data = cur_pic->data[0];
>>>
>>> I think this functionality was removed long ago. You're supposed to
>>> write/read AVFrames from the filters.
>>
>> Due to internal reasons, we are running ffmpeg 0.7, so the primary arguments
>> to draw_slice() is AVFilterLink*. Sorry I should have specified that when
>> asked the question.
>
> Sure is ancient...
>
>> Or maybe I am missing something obvious here? Can you help me out with how
>> to use AVFrame to extract the luminance component?
>
> AVFrame works similar to AVFilterBufferRef. Assuming the data member
> contains the plane pointers, data[0] will contain the plane with the
> luminance data.
Thank you for responding, wm4. Let's use this from pixfmt.h header file as an
example:
PIX_FMT_YUV420P, ///< planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2
Y samples)
Does that mean I should read in the luminance plane 2 bytes at a time and
interpret it as a number together? The reason I ask that is because the
linesize of data[0] is twice as wide as data[1] or data[2] (720 vs 368 and 368,
respectively). Also the data point is declared as "uint8_t *", how does one
determine how to interpret the type of the value - int, float, etc?
Thank you again!
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