/* * Copyright (c) 2004 Ville Saari * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 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 General Public License for more details. * * You should have received a copy of the GNU 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/avassert.h" #include "libavutil/imgutils.h" #include "libavutil/pixdesc.h" #include "libavutil/opt.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #include "video.h" enum PhaseMode { PROGRESSIVE, TOP_FIRST, BOTTOM_FIRST, TOP_FIRST_ANALYZE, BOTTOM_FIRST_ANALYZE, ANALYZE, FULL_ANALYZE, AUTO, AUTO_ANALYZE }; typedef struct PhaseContext { const AVClass *class; int mode; ///<PhaseMode AVFrame *frame; /* previous frame */ int nb_planes; int planeheight[4]; int linesize[4]; } PhaseContext; #define OFFSET(x) offsetof(PhaseContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit } static const AVOption phase_options[] = { { "mode", "set phase mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=AUTO_ANALYZE}, PROGRESSIVE, AUTO_ANALYZE, FLAGS, "mode" }, CONST("p", "progressive", PROGRESSIVE, "mode"), CONST("t", "top first", TOP_FIRST, "mode"), CONST("b", "bottom first", BOTTOM_FIRST, "mode"), CONST("T", "top first analyze", TOP_FIRST_ANALYZE, "mode"), CONST("B", "bottom first analyze", BOTTOM_FIRST_ANALYZE, "mode"), CONST("u", "analyze", ANALYZE, "mode"), CONST("U", "full analyze", FULL_ANALYZE, "mode"), CONST("a", "auto", AUTO, "mode"), CONST("A", "auto analyze", AUTO_ANALYZE, "mode"), { NULL } }; AVFILTER_DEFINE_CLASS(phase); static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, 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 int config_input(AVFilterLink *inlink) { PhaseContext *s = inlink->dst->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); int ret; if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0) return ret; s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); s->planeheight[0] = s->planeheight[3] = inlink->h; s->nb_planes = av_pix_fmt_count_planes(inlink->format); return 0; } /* * This macro interpolates the value of both fields at a point halfway * between lines and takes the squared difference. In field resolution * the point is a quarter pixel below a line in one field and a quarter * pixel above a line in other. * * (The result is actually multiplied by 25) */ #define DIFF(a, as, b, bs) ((t) = ((*(a) - (b)[bs]) << 2) + (a)[(as) << 1] - (b)[-(bs)], (t) * (t)) /* * Find which field combination has the smallest average squared difference * between the fields. */ static enum PhaseMode analyze_plane(void *ctx, enum PhaseMode mode, AVFrame *old, AVFrame *new) { double bdiff, tdiff, pdiff, scale; const int ns = new->linesize[0]; const int os = old->linesize[0]; const uint8_t *nptr = new->data[0]; const uint8_t *optr = old->data[0]; const int h = new->height; const int w = new->width; int bdif, tdif, pdif; if (mode == AUTO) { mode = new->interlaced_frame ? new->top_field_first ? TOP_FIRST : BOTTOM_FIRST : PROGRESSIVE; } else if (mode == AUTO_ANALYZE) { mode = new->interlaced_frame ? new->top_field_first ? TOP_FIRST_ANALYZE : BOTTOM_FIRST_ANALYZE : FULL_ANALYZE; } if (mode <= BOTTOM_FIRST) { bdiff = pdiff = tdiff = 65536.0; } else { int top = 0, t; const uint8_t *rend, *end = nptr + (h - 2) * ns; bdiff = pdiff = tdiff = 0.0; nptr += ns; optr += os; while (nptr < end) { pdif = tdif = bdif = 0; switch (mode) { case TOP_FIRST_ANALYZE: if (top) { for (rend = nptr + w; nptr < rend; nptr++, optr++) { pdif += DIFF(nptr, ns, nptr, ns); tdif += DIFF(nptr, ns, optr, os); } } else { for (rend = nptr + w; nptr < rend; nptr++, optr++) { pdif += DIFF(nptr, ns, nptr, ns); tdif += DIFF(optr, os, nptr, ns); } } break; case BOTTOM_FIRST_ANALYZE: if (top) { for (rend = nptr + w; nptr < rend; nptr++, optr++) { pdif += DIFF(nptr, ns, nptr, ns); bdif += DIFF(optr, os, nptr, ns); } } else { for (rend = nptr + w; nptr < rend; nptr++, optr++) { pdif += DIFF(nptr, ns, nptr, ns); bdif += DIFF(nptr, ns, optr, os); } } break; case ANALYZE: if (top) { for (rend = nptr + w; nptr < rend; nptr++, optr++) { tdif += DIFF(nptr, ns, optr, os); bdif += DIFF(optr, os, nptr, ns); } } else { for (rend = nptr + w; nptr < rend; nptr++, optr++) { bdif += DIFF(nptr, ns, optr, os); tdif += DIFF(optr, os, nptr, ns); } } break; case FULL_ANALYZE: if (top) { for (rend = nptr + w; nptr < rend; nptr++, optr++) { pdif += DIFF(nptr, ns, nptr, ns); tdif += DIFF(nptr, ns, optr, os); bdif += DIFF(optr, os, nptr, ns); } } else { for (rend = nptr + w; nptr < rend; nptr++, optr++) { pdif += DIFF(nptr, ns, nptr, ns); bdif += DIFF(nptr, ns, optr, os); tdif += DIFF(optr, os, nptr, ns); } } break; default: av_assert0(0); } pdiff += (double)pdif; tdiff += (double)tdif; bdiff += (double)bdif; nptr += ns - w; optr += os - w; top ^= 1; } scale = 1.0 / (w * (h - 3)) / 25.0; pdiff *= scale; tdiff *= scale; bdiff *= scale; if (mode == TOP_FIRST_ANALYZE) { bdiff = 65536.0; } else if (mode == BOTTOM_FIRST_ANALYZE) { tdiff = 65536.0; } else if (mode == ANALYZE) { pdiff = 65536.0; } if (bdiff < pdiff && bdiff < tdiff) { mode = BOTTOM_FIRST; } else if (tdiff < pdiff && tdiff < bdiff) { mode = TOP_FIRST; } else { mode = PROGRESSIVE; } } av_log(ctx, AV_LOG_DEBUG, "mode=%c tdiff=%f bdiff=%f pdiff=%f\n", mode == BOTTOM_FIRST ? 'b' : mode == TOP_FIRST ? 't' : 'p', tdiff, bdiff, pdiff); return mode; } static int filter_frame(AVFilterLink *inlink, AVFrame *in) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = ctx->outputs[0]; PhaseContext *s = ctx->priv; enum PhaseMode mode; int plane, top, y; AVFrame *out; if (ctx->is_disabled) { av_frame_free(&s->frame); /* we keep a reference to the previous frame so the filter can start * being useful as soon as it's not disabled, avoiding the 1-frame * delay. */ s->frame = av_frame_clone(in); return ff_filter_frame(outlink, in); } 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); if (!s->frame) { s->frame = in; mode = PROGRESSIVE; } else { mode = analyze_plane(ctx, s->mode, s->frame, in); } for (plane = 0; plane < s->nb_planes; plane++) { const uint8_t *buf = s->frame->data[plane]; const uint8_t *from = in->data[plane]; uint8_t *to = out->data[plane]; for (y = 0, top = 1; y < s->planeheight[plane]; y++, top ^= 1) { memcpy(to, mode == (top ? BOTTOM_FIRST : TOP_FIRST) ? buf : from, s->linesize[plane]); buf += s->frame->linesize[plane]; from += in->linesize[plane]; to += out->linesize[plane]; } } if (in != s->frame) av_frame_free(&s->frame); s->frame = in; return ff_filter_frame(outlink, out); } static av_cold void uninit(AVFilterContext *ctx) { PhaseContext *s = ctx->priv; av_frame_free(&s->frame); } static const AVFilterPad phase_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_input, }, { NULL } }; static const AVFilterPad phase_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter ff_vf_phase = { .name = "phase", .description = NULL_IF_CONFIG_SMALL("Phase shift fields."), .priv_size = sizeof(PhaseContext), .priv_class = &phase_class, .uninit = uninit, .query_formats = query_formats, .inputs = phase_inputs, .outputs = phase_outputs, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, };