/* * 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/common.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "formats.h" #include "internal.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 = 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]; if (pos_h[p] < w) memcpy(dst, ssrc + pos_h[p], w - pos_h[p]); if (pos_h[p] > 0) memcpy(dst + w - pos_h[p], ssrc, pos_h[p]); dst += out->linesize[p]; } } s->h_pos += s->h_speed * in->width; s->v_pos += s->v_speed * in->height; } 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 = (1.f - s->h_ipos) * inlink->w; s->v_pos = (1.f - 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 #define VFT AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM static const AVOption scroll_options[] = { { "horizontal", "set the horizontal scrolling speed", OFFSET(h_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT }, { "h", "set the horizontal scrolling speed", OFFSET(h_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT }, { "vertical", "set the vertical scrolling speed", OFFSET(v_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT }, { "v", "set the vertical scrolling speed", OFFSET(v_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT }, { "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, .process_command = ff_filter_process_command, };