[FFmpeg-devel] [PATCH] avfilter: add scroll video filter
Paul B Mahol
onemda at gmail.com
Mon Sep 30 20:14:49 EEST 2019
will apply.
On 9/29/19, Paul B Mahol <onemda at gmail.com> wrote:
> Signed-off-by: Paul B Mahol <onemda at gmail.com>
> ---
> doc/filters.texi | 20 ++++
> libavfilter/Makefile | 1 +
> libavfilter/allfilters.c | 1 +
> libavfilter/vf_scroll.c | 200 +++++++++++++++++++++++++++++++++++++++
> 4 files changed, 222 insertions(+)
> create mode 100644 libavfilter/vf_scroll.c
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 333f502083..416bb327c1 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -15650,6 +15650,26 @@ Scale a logo to 1/10th the height of a video, while
> preserving its display aspec
> @end example
> @end itemize
>
> + at section scroll
> +Scroll input video horizontally and/or vertically by constant speed.
> +
> +The filter accepts the following options:
> + at table @option
> + at item horizontal, h
> +Set the horizontal scrolling speed. Default is 0. Allowed range is from -1
> to 1.
> +Negative values changes scrolling direction.
> +
> + at item vertical, v
> +Set the vertical scrolling speed. Default is 0. Allowed range is from -1 to
> 1.
> +Negative values changes scrolling direction.
> +
> + at item hpos
> +Set the initial horizontal scrolling position. Default is 0. Allowed range
> is from 0 to 1.
> +
> + at item vpos
> +Set the initial vertical scrolling position. Default is 0. Allowed range is
> from 0 to 1.
> + at end table
> +
> @anchor{selectivecolor}
> @section selectivecolor
>
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index b99ecc8c26..124a3496e6 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -356,6 +356,7 @@ OBJS-$(CONFIG_SCALE_NPP_FILTER) +=
> vf_scale_npp.o scale.o
> OBJS-$(CONFIG_SCALE_QSV_FILTER) += vf_scale_qsv.o
> OBJS-$(CONFIG_SCALE_VAAPI_FILTER) += vf_scale_vaapi.o scale.o
> vaapi_vpp.o
> OBJS-$(CONFIG_SCALE2REF_FILTER) += vf_scale.o scale.o
> +OBJS-$(CONFIG_SCROLL_FILTER) += vf_scroll.o
> OBJS-$(CONFIG_SELECT_FILTER) += f_select.o
> OBJS-$(CONFIG_SELECTIVECOLOR_FILTER) += vf_selectivecolor.o
> OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index 788652ab1e..0408bcd3df 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -338,6 +338,7 @@ extern AVFilter ff_vf_scale_npp;
> extern AVFilter ff_vf_scale_qsv;
> extern AVFilter ff_vf_scale_vaapi;
> extern AVFilter ff_vf_scale2ref;
> +extern AVFilter ff_vf_scroll;
> extern AVFilter ff_vf_select;
> extern AVFilter ff_vf_selectivecolor;
> extern AVFilter ff_vf_sendcmd;
> diff --git a/libavfilter/vf_scroll.c b/libavfilter/vf_scroll.c
> new file mode 100644
> index 0000000000..36db39f2ac
> --- /dev/null
> +++ b/libavfilter/vf_scroll.c
> @@ -0,0 +1,200 @@
> +/*
> + * Copyright (c) 2019 Paul B Mahol
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
> USA
> + */
> +
> +#include "libavutil/colorspace.h"
> +#include "libavutil/common.h"
> +#include "libavutil/opt.h"
> +#include "libavutil/pixdesc.h"
> +#include "avfilter.h"
> +#include "drawutils.h"
> +#include "formats.h"
> +#include "internal.h"
> +#include "video.h"
> +
> +typedef struct ScrollContext {
> + const AVClass *class;
> +
> + float h_speed, v_speed;
> + float h_pos, v_pos;
> + float h_ipos, v_ipos;
> +
> + const AVPixFmtDescriptor *desc;
> + int nb_planes;
> + int bytes;
> +
> + int planewidth[4];
> + int planeheight[4];
> +} ScrollContext;
> +
> +static int query_formats(AVFilterContext *ctx)
> +{
> + static const enum AVPixelFormat pix_fmts[] = {
> + AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
> + AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
> + AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P,
> AV_PIX_FMT_YUV420P,
> + AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
> + AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
> + AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
> + AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
> + AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
> AV_PIX_FMT_YUV440P12,
> + AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
> + AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
> + AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
> + AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10,
> AV_PIX_FMT_YUVA444P10,
> + AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16,
> AV_PIX_FMT_YUVA444P16,
> + AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
> + AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
> + AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12,
> AV_PIX_FMT_GBRAP16,
> + AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10,
> AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
> + AV_PIX_FMT_NONE
> + };
> +
> + AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
> + if (!fmts_list)
> + return AVERROR(ENOMEM);
> + return ff_set_common_formats(ctx, fmts_list);
> +}
> +
> +static void scroll(ScrollContext *s, AVFrame *in, AVFrame *out)
> +{
> + int h_pos, v_pos;
> + int pos_h[4], pos_v[4];
> +
> + s->h_pos += s->h_speed * in->width;
> + s->v_pos += s->v_speed * in->height;
> +
> + s->h_pos = fmodf(s->h_pos, in->width);
> + s->v_pos = fmodf(s->v_pos, in->height);
> +
> + h_pos = s->h_pos;
> + v_pos = s->v_pos;
> +
> + if (h_pos < 0)
> + h_pos += in->width;
> + if (v_pos < 0)
> + v_pos += in->height;
> +
> + pos_v[1] = pos_v[2] = AV_CEIL_RSHIFT(v_pos, s->desc->log2_chroma_h);
> + pos_v[0] = pos_v[3] = v_pos;
> + pos_h[1] = pos_h[2] = AV_CEIL_RSHIFT(h_pos, s->desc->log2_chroma_w) *
> s->bytes;
> + pos_h[0] = pos_h[3] = h_pos * s->bytes;
> +
> + for (int p = 0; p < s->nb_planes; p++) {
> + const uint8_t *src = in->data[p];
> + uint8_t *dst = out->data[p];
> + const int h = s->planeheight[p];
> + const int w = s->planewidth[p] * s->bytes;
> +
> + for (int y = 0; y < h; y++) {
> + int yy = (y + pos_v[p]) % h;
> + const uint8_t *ssrc = src + yy * in->linesize[p];
> +
> + memcpy(dst, ssrc + pos_h[p], w - pos_h[p]);
> + if (pos_h[p])
> + memcpy(dst + w - pos_h[p], ssrc, pos_h[p]);
> +
> + dst += out->linesize[p];
> + }
> + }
> +}
> +
> +static int filter_frame(AVFilterLink *inlink, AVFrame *in)
> +{
> + AVFilterContext *ctx = inlink->dst;
> + ScrollContext *s = ctx->priv;
> + AVFilterLink *outlink = ctx->outputs[0];
> + AVFrame *out;
> +
> + out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
> + if (!out) {
> + av_frame_free(&in);
> + return AVERROR(ENOMEM);
> + }
> + av_frame_copy_props(out, in);
> +
> + scroll(s, in, out);
> +
> + av_frame_free(&in);
> + return ff_filter_frame(outlink, out);
> +}
> +
> +static int config_input(AVFilterLink *inlink)
> +{
> + AVFilterContext *ctx = inlink->dst;
> + ScrollContext *s = ctx->priv;
> +
> + s->desc = av_pix_fmt_desc_get(inlink->format);
> + s->nb_planes = s->desc->nb_components;
> + s->bytes = (s->desc->comp[0].depth + 7) >> 3;
> +
> + s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h,
> s->desc->log2_chroma_h);
> + s->planeheight[0] = s->planeheight[3] = inlink->h;
> + s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w,
> s->desc->log2_chroma_w);
> + s->planewidth[0] = s->planewidth[3] = inlink->w;
> +
> + s->h_pos += s->h_ipos * inlink->w;
> + s->v_pos += s->v_ipos * inlink->h;
> +
> + return 0;
> +}
> +
> +#define OFFSET(x) offsetof(ScrollContext, x)
> +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
> +
> +static const AVOption scroll_options[] = {
> + { "horizontal", "set the horizontal scrolling speed", OFFSET(h_speed),
> AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., FLAGS },
> + { "h", "set the horizontal scrolling speed", OFFSET(h_speed),
> AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., FLAGS },
> + { "vertical", "set the vertical scrolling speed", OFFSET(v_speed),
> AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., FLAGS },
> + { "v", "set the vertical scrolling speed", OFFSET(v_speed),
> AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., FLAGS },
> + { "hpos", "set initial horizontal position", OFFSET(h_ipos),
> AV_OPT_TYPE_FLOAT, {.dbl=0.}, 0, 1., FLAGS },
> + { "vpos", "set initial vertical position", OFFSET(v_ipos),
> AV_OPT_TYPE_FLOAT, {.dbl=0.}, 0, 1., FLAGS },
> + { NULL }
> +};
> +
> +AVFILTER_DEFINE_CLASS(scroll);
> +
> +static const AVFilterPad scroll_inputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = config_input,
> + .filter_frame = filter_frame,
> + },
> + { NULL }
> +};
> +
> +static const AVFilterPad scroll_outputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + },
> + { NULL }
> +};
> +
> +AVFilter ff_vf_scroll = {
> + .name = "scroll",
> + .description = NULL_IF_CONFIG_SMALL("Scroll input video."),
> + .priv_size = sizeof(ScrollContext),
> + .priv_class = &scroll_class,
> + .query_formats = query_formats,
> + .inputs = scroll_inputs,
> + .outputs = scroll_outputs,
> + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
> +};
> --
> 2.17.1
>
>
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