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/*

 * 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;

    enum PhaseMode mode;

    AVFrame *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

    };

    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

    return 0;

}

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(AVFilterContext *ctx, PhaseContext *s,

                                    AVFrame *old, AVFrame *new)

{

    double bdiff, tdiff, pdiff, scale;

    const int ns = new->linesize[0];

    const int os = old->linesize[0];

    uint8_t *nptr = new->data[0];

    uint8_t *optr = old->data[0];

    const int h = new->height;

    const int w = new->width;

    int bdif, tdif, pdif;

    enum PhaseMode mode = s->mode;

    uint8_t *end, *rend;

    int top, t;

    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 {

        bdiff = pdiff = tdiff = 0.0;

        for (end = nptr + (h - 2) * ns, nptr += ns, optr += os, top = 0;

             nptr < end; nptr += ns - w, optr += os - w, top ^= 1) {

            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;

        }

        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;

    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) {

        mode = PROGRESSIVE;

        s->frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);

        if (!s->frame) {

            av_frame_free(&in);

            av_frame_free(&out);

            return AVERROR(ENOMEM);

        }

    } else {

        mode = analyze_plane(ctx, s, s->frame, in);

    }

    for (plane = 0; plane < s->nb_planes; plane++) {

        uint8_t *buf = s->frame->data[plane];

        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]);

            memcpy(buf, from, s->linesize[plane]);

            buf += s->frame->linesize[plane];

            from += in->linesize[plane];

            to += out->linesize[plane];

        }

    }

    av_frame_free(&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 avfilter_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,

};