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/*

 * Copyright (c) 2012-2013 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/avassert.h"

#include "libavutil/opt.h"

#include "libavutil/parseutils.h"

#include "libavutil/pixdesc.h"

#include "avfilter.h"

#include "formats.h"

#include "internal.h"

#include "video.h"

enum HistogramMode {

    MODE_LEVELS,

    MODE_WAVEFORM,

    MODE_COLOR,

    MODE_COLOR2,

    MODE_NB

};

typedef struct HistogramContext {

    const AVClass *class;               ///< AVClass context for log and options purpose

    enum HistogramMode mode;

    unsigned       histogram[256];

    int            ncomp;

    const uint8_t  *bg_color;

    const uint8_t  *fg_color;

    int            level_height;

    int            scale_height;

    int            step;

    int            waveform_mode;

    int            waveform_mirror;

    int            display_mode;

    int            levels_mode;

    const AVPixFmtDescriptor *desc;

} HistogramContext;

#define OFFSET(x) offsetof(HistogramContext, x)

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption histogram_options[] = {

    { "mode", "set histogram mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_LEVELS}, 0, MODE_NB-1, FLAGS, "mode"},

    { "levels", "standard histogram", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LEVELS}, 0, 0, FLAGS, "mode" },

    { "waveform", "per row/column luminance graph", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WAVEFORM}, 0, 0, FLAGS, "mode" },

    { "color", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR}, 0, 0, FLAGS, "mode" },

    { "color2", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR2}, 0, 0, FLAGS, "mode" },

    { "level_height", "set level height", OFFSET(level_height), AV_OPT_TYPE_INT, {.i64=200}, 50, 2048, FLAGS},

    { "scale_height", "set scale height", OFFSET(scale_height), AV_OPT_TYPE_INT, {.i64=12}, 0, 40, FLAGS},

    { "step", "set waveform step value", OFFSET(step), AV_OPT_TYPE_INT, {.i64=10}, 1, 255, FLAGS},

    { "waveform_mode", "set waveform mode", OFFSET(waveform_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "waveform_mode"},

    { "row",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "waveform_mode" },

    { "column", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "waveform_mode" },

    { "waveform_mirror", "set waveform mirroring", OFFSET(waveform_mirror), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "waveform_mirror"},

    { "display_mode", "set display mode", OFFSET(display_mode), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "display_mode"},

    { "parade",  NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "display_mode" },

    { "overlay", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "display_mode" },

    { "levels_mode", "set levels mode", OFFSET(levels_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "levels_mode"},

    { "linear",      NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "levels_mode" },

    { "logarithmic", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "levels_mode" },

    { NULL }

};

AVFILTER_DEFINE_CLASS(histogram);

static const enum AVPixelFormat color_pix_fmts[] = {

    AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P,

    AV_PIX_FMT_NONE

};

static const enum AVPixelFormat levels_pix_fmts[] = {

    AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P,

    AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_NONE

};

static const enum AVPixelFormat waveform_pix_fmts[] = {

     AV_PIX_FMT_GBRP,     AV_PIX_FMT_GBRAP,

     AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,

     AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV440P,

     AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,

     AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P,

     AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,

     AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,

     AV_PIX_FMT_GRAY8,

     AV_PIX_FMT_NONE

};

static int query_formats(AVFilterContext *ctx)

{

    HistogramContext *h = ctx->priv;

    const enum AVPixelFormat *pix_fmts;

    switch (h->mode) {

    case MODE_WAVEFORM:

        pix_fmts = waveform_pix_fmts;

        break;

    case MODE_LEVELS:

        pix_fmts = levels_pix_fmts;

        break;

    case MODE_COLOR:

    case MODE_COLOR2:

        pix_fmts = color_pix_fmts;

        break;

    default:

        av_assert0(0);

    }

    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

    return 0;

}

static const uint8_t black_yuva_color[4] = { 0, 127, 127, 255 };

static const uint8_t black_gbrp_color[4] = { 0, 0, 0, 255 };

static const uint8_t white_yuva_color[4] = { 255, 127, 127, 255 };

static const uint8_t white_gbrp_color[4] = { 255, 255, 255, 255 };

static int config_input(AVFilterLink *inlink)

{

    HistogramContext *h = inlink->dst->priv;

    h->desc  = av_pix_fmt_desc_get(inlink->format);

    h->ncomp = h->desc->nb_components;

    switch (inlink->format) {

    case AV_PIX_FMT_GBRAP:

    case AV_PIX_FMT_GBRP:

        h->bg_color = black_gbrp_color;

        h->fg_color = white_gbrp_color;

        break;

    default:

        h->bg_color = black_yuva_color;

        h->fg_color = white_yuva_color;

    }

    return 0;

}

static int config_output(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    HistogramContext *h = ctx->priv;

    switch (h->mode) {

    case MODE_LEVELS:

        outlink->w = 256;

        outlink->h = (h->level_height + h->scale_height) * FFMAX(h->ncomp * h->display_mode, 1);

        break;

    case MODE_WAVEFORM:

        if (h->waveform_mode)

            outlink->h = 256 * FFMAX(h->ncomp * h->display_mode, 1);

        else

            outlink->w = 256 * FFMAX(h->ncomp * h->display_mode, 1);

        break;

    case MODE_COLOR:

    case MODE_COLOR2:

        outlink->h = outlink->w = 256;

        break;

    default:

        av_assert0(0);

    }

    outlink->sample_aspect_ratio = (AVRational){1,1};

    return 0;

}

static void gen_waveform(HistogramContext *h, AVFrame *inpicref, AVFrame *outpicref,

                         int component, int intensity, int offset, int col_mode)

{

    const int plane = h->desc->comp[component].plane;

    const int mirror = h->waveform_mirror;

    const int is_chroma = (component == 1 || component == 2);

    const int shift_w = (is_chroma ? h->desc->log2_chroma_w : 0);

    const int shift_h = (is_chroma ? h->desc->log2_chroma_h : 0);

    const int src_linesize = inpicref->linesize[plane];

    const int dst_linesize = outpicref->linesize[plane];

    const int dst_signed_linesize = dst_linesize * (mirror == 1 ? -1 : 1);

    uint8_t *src_data = inpicref->data[plane];

    uint8_t *dst_data = outpicref->data[plane] + (col_mode ? (offset >> shift_h) * dst_linesize : offset >> shift_w);

    uint8_t * const dst_bottom_line = dst_data + dst_linesize * ((256 >> shift_h) - 1);

    uint8_t * const dst_line = (mirror ? dst_bottom_line : dst_data);

    const uint8_t max = 255 - intensity;

    const int src_h = FF_CEIL_RSHIFT(inpicref->height, shift_h);

    const int src_w = FF_CEIL_RSHIFT(inpicref->width, shift_w);

    uint8_t *dst, *p;

    int y;

    if (!col_mode && mirror)

        dst_data += 256 >> shift_w;

    for (y = 0; y < src_h; y++) {

        const uint8_t *src_data_end = src_data + src_w;

        dst = dst_line;

        for (p = src_data; p < src_data_end; p++) {

            uint8_t *target;

            if (col_mode) {

                target = dst++ + dst_signed_linesize * (*p >> shift_h);

            } else {

                if (mirror)

                    target = dst_data - (*p >> shift_w);

                else

                    target = dst_data + (*p >> shift_w);

            }

            if (*target <= max)

                *target += intensity;

            else

                *target = 255;

        }

        src_data += src_linesize;

        dst_data += dst_linesize;

    }

}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)

{

    HistogramContext *h   = inlink->dst->priv;

    AVFilterContext *ctx  = inlink->dst;

    AVFilterLink *outlink = ctx->outputs[0];

    AVFrame *out;

    const uint8_t *src;

    uint8_t *dst;

    int i, j, k, l;

    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

    if (!out) {

        av_frame_free(&in);

        return AVERROR(ENOMEM);

    }

    out->pts = in->pts;

    for (k = 0; k < h->ncomp; k++) {

        const int is_chroma = (k == 1 || k == 2);

        const int dst_h = FF_CEIL_RSHIFT(outlink->h, (is_chroma ? h->desc->log2_chroma_h : 0));

        const int dst_w = FF_CEIL_RSHIFT(outlink->w, (is_chroma ? h->desc->log2_chroma_w : 0));

        for (i = 0; i < dst_h ; i++)

            memset(out->data[h->desc->comp[k].plane] +

                   i * out->linesize[h->desc->comp[k].plane],

                   h->bg_color[k], dst_w);

    }

    switch (h->mode) {

    case MODE_LEVELS:

        for (k = 0; k < h->ncomp; k++) {

            const int p = h->desc->comp[k].plane;

            const int start = k * (h->level_height + h->scale_height) * h->display_mode;

            double max_hval_log;

            unsigned max_hval = 0;

            for (i = 0; i < in->height; i++) {

                src = in->data[p] + i * in->linesize[p];

                for (j = 0; j < in->width; j++)

                    h->histogram[src[j]]++;

            }

            for (i = 0; i < 256; i++)

                max_hval = FFMAX(max_hval, h->histogram[i]);

            max_hval_log = log2(max_hval + 1);

            for (i = 0; i < outlink->w; i++) {

                int col_height;

                if (h->levels_mode)

                    col_height = round(h->level_height * (1. - (log2(h->histogram[i] + 1) / max_hval_log)));

                else

                    col_height = h->level_height - (h->histogram[i] * (int64_t)h->level_height + max_hval - 1) / max_hval;

                for (j = h->level_height - 1; j >= col_height; j--) {

                    if (h->display_mode) {

                        for (l = 0; l < h->ncomp; l++)

                            out->data[l][(j + start) * out->linesize[l] + i] = h->fg_color[l];

                    } else {

                        out->data[p][(j + start) * out->linesize[p] + i] = 255;

                    }

                }

                for (j = h->level_height + h->scale_height - 1; j >= h->level_height; j--)

                    out->data[p][(j + start) * out->linesize[p] + i] = i;

            }

            memset(h->histogram, 0, 256 * sizeof(unsigned));

        }

        break;

    case MODE_WAVEFORM:

        for (k = 0; k < h->ncomp; k++) {

            const int offset = k * 256 * h->display_mode;

            gen_waveform(h, in, out, k, h->step, offset, h->waveform_mode);

        }

        break;

    case MODE_COLOR:

        for (i = 0; i < inlink->h; i++) {

            const int iw1 = i * in->linesize[1];

            const int iw2 = i * in->linesize[2];

            for (j = 0; j < inlink->w; j++) {

                const int pos = in->data[1][iw1 + j] * out->linesize[0] + in->data[2][iw2 + j];

                if (out->data[0][pos] < 255)

                    out->data[0][pos]++;

            }

        }

        for (i = 0; i < 256; i++) {

            dst = out->data[0] + i * out->linesize[0];

            for (j = 0; j < 256; j++) {

                if (!dst[j]) {

                    out->data[1][i * out->linesize[0] + j] = i;

                    out->data[2][i * out->linesize[0] + j] = j;

                }

            }

        }

        break;

    case MODE_COLOR2:

        for (i = 0; i < inlink->h; i++) {

            const int iw1 = i * in->linesize[1];

            const int iw2 = i * in->linesize[2];

            for (j = 0; j < inlink->w; j++) {

                const int u = in->data[1][iw1 + j];

                const int v = in->data[2][iw2 + j];

                const int pos = u * out->linesize[0] + v;

                if (!out->data[0][pos])

                    out->data[0][pos] = FFABS(128 - u) + FFABS(128 - v);

                out->data[1][pos] = u;

                out->data[2][pos] = v;

            }

        }

        break;

    default:

        av_assert0(0);

    }

    av_frame_free(&in);

    return ff_filter_frame(outlink, out);

}

static const AVFilterPad inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .filter_frame = filter_frame,

        .config_props = config_input,

    },

    { NULL }

};

static const AVFilterPad outputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .config_props = config_output,

    },

    { NULL }

};

AVFilter avfilter_vf_histogram = {

    .name          = "histogram",

    .description   = NULL_IF_CONFIG_SMALL("Compute and draw a histogram."),

    .priv_size     = sizeof(HistogramContext),

    .query_formats = query_formats,

    .inputs        = inputs,

    .outputs       = outputs,

    .priv_class    = &histogram_class,

};