Hi Tiffany,
On 08/01/2016 11:38 AM, Tiffany Lin wrote:
> Hi Hans,
<snip>
>>> +static int vidioc_vdec_g_selection(struct file *file, void *priv,
>>> + struct v4l2_selection *s)
>>> +{
>>> + struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
>>> +
>>> + if (V4L2_TYPE_IS_OUTPUT(s->type))
>>> + return -EINVAL;
>>> +
>>> + if (s->target != V4L2_SEL_TGT_CROP)
>>> + return -EINVAL;
>>
>> How does the cropping rectangle relate to the format size? There is no s_selection,
>> so this doesn't make sense.
>>
> I want to return encoded crop information or real display region that
> display driver could know where is padding region.
Sorry, I don't understand this.
This is a decoder, so based on the bitstream it decodes to a certain width
and height. I assume that is what you refer to as coded_width and coded_height?
If so, then what is the 'real display region' and how does it relate to the
coded width/height?
This is probably a terminology issue but I need to understand this before I
can decide what should be done here.
Regards,
Hans
> User space use s_fmt/g_fmt to set/get coded_width and coded_height, and
> use g_crop to get real display region.
> That's why I do not add s_selection.
>
>> Alternatively, it could be that you are really returning V4L2_SEL_TGT_COMPOSE_PADDED.
>>
>
> V4L2_SEL_TGT_COMPOSE_PADDED means
> "The active area and all padding pixels that are inserted or modified by
> hardware."
> But I just want to return active area to user space.
>
>>> +
>>> + if (ctx->state < MTK_STATE_HEADER)
>>> + return -EINVAL;
>>> +
>>> + if ((ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_H264) ||
>>> + (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP8) ||
>>> + (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP9)) {
>>> +
>>> + if (vdec_if_get_param(ctx, GET_PARAM_CROP_INFO, &(s->r))) {
>>> + mtk_v4l2_debug(2,
>>> + "[%d]Error!! Cannot get param : GET_PARAM_CROP_INFO ERR",
>>> + ctx->id);
>>> + s->r.left = 0;
>>> + s->r.top = 0;
>>> + s->r.width = ctx->picinfo.buf_w;
>>> + s->r.height = ctx->picinfo.buf_h;
>>> + }
>>> + mtk_v4l2_debug(2, "Cropping info: l=%d t=%d w=%d h=%d",
>>> + s->r.left, s->r.top, s->r.width,
>>> + s->r.height);
>>> + } else {
>>> + s->r.left = 0;
>>> + s->r.top = 0;
>>> + s->r.width = ctx->picinfo.pic_w;
>>> + s->r.height = ctx->picinfo.pic_h;
>>> + mtk_v4l2_debug(2, "Cropping info: w=%d h=%d fw=%d fh=%d",
>>> + s->r.width, s->r.height, ctx->picinfo.buf_w,
>>> + ctx->picinfo.buf_h);
>>> + }
>>> + return 0;
>>> +}
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