[vlc-devel] Re: Question about the function pf_vout_buffer_new( p_dec )

[Sigmund Augdal Helberg]

On 2/23/06, Nelson Lam <nelson.lam at student.cityu.edu.hk> wrote:
> Hello,
>
> I have init the parameters of the image. Because I am testing the code, so
> some of the values are meaningless. Here is the init code:
>     p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
>     p_dec->fmt_out.video.i_visible_width =
>     p_dec->fmt_out.video.i_width = NULL;
>     p_dec->fmt_out.video.i_visible_height =
>     p_dec->fmt_out.video.i_height = NULL;
>     p_dec->fmt_out.video.i_aspect = p_dec->fmt_in.video.i_aspect;
>     p_dec->fmt_out.video.i_frame_rate = 1;
>     p_dec->fmt_out.video.i_frame_rate_base = 1;
>     p_pic->b_progressive = 1;
>     p_pic->b_top_field_first = 1;
>     p_pic->i_nb_fields = 2;
> And then I call
>     p_pic = p_dec->pf_vout_buffer_new( p_dec );
>     printf("%p",p_pic);
>
> However, printf shows that the p_pic is (nil). I tried to set the width and
> height as 352 and 288. But there is an error message:
>
> [-1264541472] main decoder debug: no usable vout present, spawning one
> floating point error
Try looking at some of the other video codecs for some examples.

from a quick peek at least the following things seems necessary:
 vout_InitFormat( &p_dec->fmt_out.video, <chroma>, <width>, <height>,<aspect>)
    p_dec->fmt_out.i_cat = VIDEO_ES;
    p_dec->fmt_out.i_codec = <chroma>;

"floating point error" usually indicates a divition by zero, which I
assume is because some value is unset.

Hope this helps

Sigmund
>
> Could anyone please help me to solve the problem?
>
> Much thanks,
> Nelson
>
>
> >===== Original Message From Clément Stenac <zorglub at via.ecp.fr> =====
> >Hello,
> >
> >I suppose you did not correctly init the parameters of the image (the
> >p_dec->fmt_out.video stuff)
> >
> >Hope this helps,
> >
> >--
> >Clément
> >
> >--
> >This is the vlc-devel mailing-list, see http://www.videolan.org/vlc/
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>
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