2 * Copyright (c) 2019 Paul B Mahol
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavutil/common.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
28 typedef struct ScrollContext {
31 float h_speed, v_speed;
35 const AVPixFmtDescriptor *desc;
43 static int query_formats(AVFilterContext *ctx)
45 static const enum AVPixelFormat pix_fmts[] = {
46 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
47 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
48 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
49 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
50 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
51 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
52 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
53 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
54 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
55 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
56 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
57 AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
58 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
59 AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
60 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
61 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
62 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
63 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
67 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
69 return AVERROR(ENOMEM);
70 return ff_set_common_formats(ctx, fmts_list);
73 static void scroll(ScrollContext *s, AVFrame *in, AVFrame *out)
76 int pos_h[4], pos_v[4];
78 s->h_pos = fmodf(s->h_pos, in->width);
79 s->v_pos = fmodf(s->v_pos, in->height);
89 pos_v[1] = pos_v[2] = AV_CEIL_RSHIFT(v_pos, s->desc->log2_chroma_h);
90 pos_v[0] = pos_v[3] = v_pos;
91 pos_h[1] = pos_h[2] = AV_CEIL_RSHIFT(h_pos, s->desc->log2_chroma_w) * s->bytes;
92 pos_h[0] = pos_h[3] = h_pos * s->bytes;
94 for (int p = 0; p < s->nb_planes; p++) {
95 const uint8_t *src = in->data[p];
96 uint8_t *dst = out->data[p];
97 const int h = s->planeheight[p];
98 const int w = s->planewidth[p] * s->bytes;
100 for (int y = 0; y < h; y++) {
101 int yy = (y + pos_v[p]) % h;
102 const uint8_t *ssrc = src + yy * in->linesize[p];
105 memcpy(dst, ssrc + pos_h[p], w - pos_h[p]);
107 memcpy(dst + w - pos_h[p], ssrc, pos_h[p]);
109 dst += out->linesize[p];
113 s->h_pos += s->h_speed * in->width;
114 s->v_pos += s->v_speed * in->height;
117 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
119 AVFilterContext *ctx = inlink->dst;
120 ScrollContext *s = ctx->priv;
121 AVFilterLink *outlink = ctx->outputs[0];
124 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
127 return AVERROR(ENOMEM);
129 av_frame_copy_props(out, in);
134 return ff_filter_frame(outlink, out);
137 static int config_input(AVFilterLink *inlink)
139 AVFilterContext *ctx = inlink->dst;
140 ScrollContext *s = ctx->priv;
142 s->desc = av_pix_fmt_desc_get(inlink->format);
143 s->nb_planes = s->desc->nb_components;
144 s->bytes = (s->desc->comp[0].depth + 7) >> 3;
146 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
147 s->planeheight[0] = s->planeheight[3] = inlink->h;
148 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
149 s->planewidth[0] = s->planewidth[3] = inlink->w;
151 s->h_pos = (1.f - s->h_ipos) * inlink->w;
152 s->v_pos = (1.f - s->v_ipos) * inlink->h;
157 #define OFFSET(x) offsetof(ScrollContext, x)
158 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
159 #define VFT AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
161 static const AVOption scroll_options[] = {
162 { "horizontal", "set the horizontal scrolling speed", OFFSET(h_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
163 { "h", "set the horizontal scrolling speed", OFFSET(h_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
164 { "vertical", "set the vertical scrolling speed", OFFSET(v_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
165 { "v", "set the vertical scrolling speed", OFFSET(v_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
166 { "hpos", "set initial horizontal position", OFFSET(h_ipos), AV_OPT_TYPE_FLOAT, {.dbl=0.}, 0, 1., FLAGS },
167 { "vpos", "set initial vertical position", OFFSET(v_ipos), AV_OPT_TYPE_FLOAT, {.dbl=0.}, 0, 1., FLAGS },
171 AVFILTER_DEFINE_CLASS(scroll);
173 static const AVFilterPad scroll_inputs[] = {
176 .type = AVMEDIA_TYPE_VIDEO,
177 .config_props = config_input,
178 .filter_frame = filter_frame,
183 static const AVFilterPad scroll_outputs[] = {
186 .type = AVMEDIA_TYPE_VIDEO,
191 AVFilter ff_vf_scroll = {
193 .description = NULL_IF_CONFIG_SMALL("Scroll input video."),
194 .priv_size = sizeof(ScrollContext),
195 .priv_class = &scroll_class,
196 .query_formats = query_formats,
197 .inputs = scroll_inputs,
198 .outputs = scroll_outputs,
199 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
200 .process_command = ff_filter_process_command,