[Libav-user] BGR24 to YUV pixel conversion

[Neil Menne]

Nevermind all that previous nonsense. I misunderstood the intended use of
avpicture_fill and that was the source of a great deal of my confusion. Now
I can ask the right question:

*How do I get the raw image buffer (located in a uint8_t array called data)
into the AVFrame? *
*
*
I've looked at the API a great deal today and yesterday, and I don't see a
clear way to accomplish this.

-Neil


On Tue, Apr 23, 2013 at 10:22 AM, Neil Menne <the1evilgenius at gmail.com>wrote:

>    //begin relevant code here
>    mSwsContext  = sws_getContext(input_width,
>                                  input_height,
>                                  input_pixel_format,
>                                  output_width,
>                                  output_height,
>                                  output_pixel_format,
>                                  SWS_BICUBIC,
>                                  NULL,
>                                  NULL,
>                                  NULL);
>
>    AVPicture input_picture;
>    avpicture_alloc(&input_picture,
>                    input_pixel_format, //AV_PIX_FMT_BGR24
>                    input_width, //656
>                    input_height); //354
>
>    ret = avpicture_fill(&input_picture,
>                         data,
>                         input_pixel_format,
>                         input_width,
>                         input_height);
>
>    AVPicture output_picture;
>    avpicture_alloc(&output_picture,
>                    output_pixel_format,
>                    output_width,
>                    output_height);
>
>    if (mSwsContext != NULL)
>    {
>       ret = sws_scale(mSwsContext,
>                       input_picture.data,
>                       input_picture.linesize,
>                       0,
>                       input_height,
>                       output_picture.data,
>                       output_picture.linesize);
>
>       //ret here is always 0
>    }
>
>    //etc....
>
>
> On Tue, Apr 23, 2013 at 10:21 AM, Neil Menne <
> nhmenne42 at students.tntech.edu> wrote:
>
>> I'm trying to convert a raw image that I receive as a unsigned character
>> array. I then create (via avpicture_alloc) two AVPictures (one for the
>> source and one for the destination). I then do an avpicture_fill for the
>> input using the unsigned character array. The value returned by
>> avpicture_fill matches the size of the original image.
>>
>> When I do the sws_scale, I get a printout saying "bad src image pointers"
>> which comes from the check_image_pointers function in sws_scale. My
>> question is this: How is this happening? I'm filling an allocated picture.
>> Where is the disconnect?
>>
>> Thanks in advance, guys.
>>
>> -Neil
>>
>> P.S. here's the relevant snippet of code
>>
>>
>
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