On 10/02/2020 12:03, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> configure | 1 +
> doc/filters.texi | 77 +++++++
> libavfilter/Makefile | 1 +
> libavfilter/allfilters.c | 1 +
> libavfilter/opencl/pad.cl | 36 ++++
> libavfilter/opencl_source.h | 1 +
> libavfilter/vf_pad_opencl.c | 397 ++++++++++++++++++++++++++++++++++++
> 7 files changed, 514 insertions(+)
> create mode 100644 libavfilter/opencl/pad.cl
> create mode 100644 libavfilter/vf_pad_opencl.c
>
> ...
> +
> +The @var{x} expression can reference the value set by the @var{y}
> +expression, and vice versa.
> +
> +The default value of @var{x} and @var{y} is 0.
> +
> +If @var{x} or @var{y} evaluate to a negative number, they'll be changed
> +so the input image is centered on the padded area.
> +
> +@item color
> +Specify the color of the padded area. For the syntax of this option,
> +check the @ref{color syntax,,"Color" section in the ffmpeg-utils
> +manual,ffmpeg-utils}.
> +
> +@item aspect
> +Pad to aspect instead to a resolution.
Funny phrasing. "Pad to an aspect ratio instead of to a resolution.", maybe.
> +@end table
> +
> +The value for the @var{width}, @var{height}, @var{x}, and @var{y}
> +options are expressions containing the following constants:
> +
> +@table @option
> +@item in_w
> +@item in_h
> +The input video width and height.
> +
> +@item iw
> +@item ih
> +These are the same as @var{in_w} and @var{in_h}.
> +
> ...
> +
> +static int pad_opencl_init(AVFilterContext *avctx, AVFrame *input_frame)
> +{
> + PadOpenCLContext *ctx = avctx->priv;
> + AVHWFramesContext *input_frames_ctx = (AVHWFramesContext
> *)input_frame->hw_frames_ctx->data;
> + const AVPixFmtDescriptor *desc =
> av_pix_fmt_desc_get(input_frames_ctx->sw_format);
> + uint8_t rgba_map[4];
> + cl_int cle;
> + int err;
> +
> + ff_fill_rgba_map(rgba_map, input_frames_ctx->sw_format);
Ah, cute. It's nice that a function already exists for this case :)
> + ctx->is_rgb = !!(desc->flags & AV_PIX_FMT_FLAG_RGB);
> + ctx->is_packed = !(desc->flags & AV_PIX_FMT_FLAG_PLANAR);
> + ctx->hsub = desc->log2_chroma_w;
> + ctx->vsub = desc->log2_chroma_h;
> +
> + err = ff_opencl_filter_load_program(avctx, &ff_opencl_source_pad, 1);
> + if (err < 0)
> + goto fail;
> +
> ...
I tested a bit on Mali and everything else LGTM.
Thanks,
- Mark
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