[FFmpeg-devel] [PATCH] libavcodec/vp9: export block structure when segmentation isn't enable

[Yongle Lin]

On Mon, Jul 6, 2020 at 11:31 AM Yongle Lin <yongle.lin.94 at gmail.com> wrote:

> it makes sense to export block structure like src_x, src_y, width and
> height when segmentation isn't enable so we could visualize and see the
> structure of the block.
> ---
>  libavcodec/vp9.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/libavcodec/vp9.c b/libavcodec/vp9.c
> index fd0bab14a2..e700def70e 100644
> --- a/libavcodec/vp9.c
> +++ b/libavcodec/vp9.c
> @@ -1501,10 +1501,8 @@ static int vp9_export_enc_params(VP9Context *s,
> VP9Frame *frame)
>      AVVideoEncParams *par;
>      unsigned int tile, nb_blocks = 0;
>
> -    if (s->s.h.segmentation.enabled) {
> -        for (tile = 0; tile < s->active_tile_cols; tile++)
> -            nb_blocks += s->td[tile].nb_block_structure;
> -    }
> +    for (tile = 0; tile < s->active_tile_cols; tile++)
> +        nb_blocks += s->td[tile].nb_block_structure;
>
>      par = av_video_enc_params_create_side_data(frame->tf.f,
>          AV_VIDEO_ENC_PARAMS_VP9, nb_blocks);
> @@ -1536,7 +1534,7 @@ static int vp9_export_enc_params(VP9Context *s,
> VP9Frame *frame)
>                  b->w     = 1 << (3 +
> td->block_structure[block_tile].block_size_idx_x);
>                  b->h     = 1 << (3 +
> td->block_structure[block_tile].block_size_idx_y);
>
> -                if (s->s.h.segmentation.feat[seg_id].q_enabled) {
> +                if (s->s.h.segmentation.enabled &&
> s->s.h.segmentation.feat[seg_id].q_enabled) {
>                      b->delta_qp = s->s.h.segmentation.feat[seg_id].q_val;
>                      if (s->s.h.segmentation.absolute_vals)
>                          b->delta_qp -= par->qp;
> --
> 2.27.0.383.g050319c2ae-goog
>
>
Dear FFmpeg Developers,

Currently ffmpeg doesn't export the block data for VP9 if there is no
segmentation. Because it's only used to export QP value. I think it makes
more sense to export the block information without segmentation so we could
visualize the block structure for VP9 video.

Could you please review and merge this patch? Thanks.

Best,
Yongle