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/*

 * Copyright (c) 2008 vmrsss

 * Copyright (c) 2009 Stefano Sabatini

 *

 * 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

 */

/**

 * @file

 * video padding filter

 */

#include "avfilter.h"

#include "formats.h"

#include "internal.h"

#include "video.h"

#include "libavutil/avstring.h"

#include "libavutil/common.h"

#include "libavutil/eval.h"

#include "libavutil/pixdesc.h"

#include "libavutil/colorspace.h"

#include "libavutil/avassert.h"

#include "libavutil/imgutils.h"

#include "libavutil/parseutils.h"

#include "libavutil/mathematics.h"

#include "libavutil/opt.h"

#include "drawutils.h"

static const char *const var_names[] = {

    "in_w",   "iw",

    "in_h",   "ih",

    "out_w",  "ow",

    "out_h",  "oh",

    "x",

    "y",

    "a",

    "sar",

    "dar",

    "hsub",

    "vsub",

    NULL

};

enum var_name {

    VAR_IN_W,   VAR_IW,

    VAR_IN_H,   VAR_IH,

    VAR_OUT_W,  VAR_OW,

    VAR_OUT_H,  VAR_OH,

    VAR_X,

    VAR_Y,

    VAR_A,

    VAR_SAR,

    VAR_DAR,

    VAR_HSUB,

    VAR_VSUB,

    VARS_NB

};

static int query_formats(AVFilterContext *ctx)

{

    ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));

    return 0;

}

typedef struct {

    const AVClass *class;

    int w, h;               ///< output dimensions, a value of 0 will result in the input size

    int x, y;               ///< offsets of the input area with respect to the padded area

    int in_w, in_h;         ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues

    char *w_expr;           ///< width  expression string

    char *h_expr;           ///< height expression string

    char *x_expr;           ///< width  expression string

    char *y_expr;           ///< height expression string

    uint8_t rgba_color[4];  ///< color for the padding area

    FFDrawContext draw;

    FFDrawColor color;

} PadContext;

static int config_input(AVFilterLink *inlink)

{

    AVFilterContext *ctx = inlink->dst;

    PadContext *s = ctx->priv;

    int ret;

    double var_values[VARS_NB], res;

    char *expr;

    ff_draw_init(&s->draw, inlink->format, 0);

    ff_draw_color(&s->draw, &s->color, s->rgba_color);

    var_values[VAR_IN_W]  = var_values[VAR_IW] = inlink->w;

    var_values[VAR_IN_H]  = var_values[VAR_IH] = inlink->h;

    var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;

    var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;

    var_values[VAR_A]     = (double) inlink->w / inlink->h;

    var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ?

        (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;

    var_values[VAR_DAR]   = var_values[VAR_A] * var_values[VAR_SAR];

    var_values[VAR_HSUB]  = 1 << s->draw.hsub_max;

    var_values[VAR_VSUB]  = 1 << s->draw.vsub_max;

    /* evaluate width and height */

    av_expr_parse_and_eval(&res, (expr = s->w_expr),

                           var_names, var_values,

                           NULL, NULL, NULL, NULL, NULL, 0, ctx);

    s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;

    if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),

                                      var_names, var_values,

                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

        goto eval_fail;

    s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;

    /* evaluate the width again, as it may depend on the evaluated output height */

    if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),

                                      var_names, var_values,

                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

        goto eval_fail;

    s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;

    /* evaluate x and y */

    av_expr_parse_and_eval(&res, (expr = s->x_expr),

                           var_names, var_values,

                           NULL, NULL, NULL, NULL, NULL, 0, ctx);

    s->x = var_values[VAR_X] = res;

    if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),

                                      var_names, var_values,

                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

        goto eval_fail;

    s->y = var_values[VAR_Y] = res;

    /* evaluate x again, as it may depend on the evaluated y value */

    if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),

                                      var_names, var_values,

                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

        goto eval_fail;

    s->x = var_values[VAR_X] = res;

    /* sanity check params */

    if (s->w < 0 || s->h < 0 || s->x < 0 || s->y < 0) {

        av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n");

        return AVERROR(EINVAL);

    }

    if (!s->w)

        s->w = inlink->w;

    if (!s->h)

        s->h = inlink->h;

    s->w    = ff_draw_round_to_sub(&s->draw, 0, -1, s->w);

    s->h    = ff_draw_round_to_sub(&s->draw, 1, -1, s->h);

    s->x    = ff_draw_round_to_sub(&s->draw, 0, -1, s->x);

    s->y    = ff_draw_round_to_sub(&s->draw, 1, -1, s->y);

    s->in_w = ff_draw_round_to_sub(&s->draw, 0, -1, inlink->w);

    s->in_h = ff_draw_round_to_sub(&s->draw, 1, -1, inlink->h);

    av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X\n",

           inlink->w, inlink->h, s->w, s->h, s->x, s->y,

           s->rgba_color[0], s->rgba_color[1], s->rgba_color[2], s->rgba_color[3]);

    if (s->x <  0 || s->y <  0                      ||

        s->w <= 0 || s->h <= 0                      ||

        (unsigned)s->x + (unsigned)inlink->w > s->w ||

        (unsigned)s->y + (unsigned)inlink->h > s->h) {

        av_log(ctx, AV_LOG_ERROR,

               "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",

               s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->h);

        return AVERROR(EINVAL);

    }

    return 0;

eval_fail:

    av_log(NULL, AV_LOG_ERROR,

           "Error when evaluating the expression '%s'\n", expr);

    return ret;

}

static int config_output(AVFilterLink *outlink)

{

    PadContext *s = outlink->src->priv;

    outlink->w = s->w;

    outlink->h = s->h;

    return 0;

}

static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)

{

    PadContext *s = inlink->dst->priv;

    AVFrame *frame = ff_get_video_buffer(inlink->dst->outputs[0],

                                         w + (s->w - s->in_w),

                                         h + (s->h - s->in_h));

    int plane;

    if (!frame)

        return NULL;

    frame->width  = w;

    frame->height = h;

    for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {

        int hsub = s->draw.hsub[plane];

        int vsub = s->draw.vsub[plane];

        frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] +

                              (s->y >> vsub) * frame->linesize[plane];

    }

    return frame;

}

/* check whether each plane in this buffer can be padded without copying */

static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)

{

    int planes[4] = { -1, -1, -1, -1}, *p = planes;

    int i, j;

    /* get all planes in this buffer */

    for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) {

        if (av_frame_get_plane_buffer(frame, i) == buf)

            *p++ = i;

    }

    /* for each plane in this buffer, check that it can be padded without

     * going over buffer bounds or other planes */

    for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) {

        int hsub = s->draw.hsub[planes[i]];

        int vsub = s->draw.vsub[planes[i]];

        uint8_t *start = frame->data[planes[i]];

        uint8_t *end   = start + (frame->height >> vsub) *

                                 frame->linesize[planes[i]];

        /* amount of free space needed before the start and after the end

         * of the plane */

        ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] +

                              (s->y >> vsub) * frame->linesize[planes[i]];

        ptrdiff_t req_end   = ((s->w - s->x - frame->width) >> hsub) *

                              s->draw.pixelstep[planes[i]] +

                              (s->y >> vsub) * frame->linesize[planes[i]];

        if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]])

            return 1;

        if (start - buf->data < req_start ||

            (buf->data + buf->size) - end < req_end)

            return 1;

        for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {

            int vsub1 = s->draw.vsub[planes[j]];

            uint8_t *start1 = frame->data[planes[j]];

            uint8_t *end1   = start1 + (frame->height >> vsub1) *

                                       frame->linesize[planes[j]];

            if (i == j)

                continue;

            if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) ||

                FFSIGN(end - start1) != FFSIGN(end - start1 + req_end))

                return 1;

        }

    }

    return 0;

}

static int frame_needs_copy(PadContext *s, AVFrame *frame)

{

    int i;

    if (!av_frame_is_writable(frame))

        return 1;

    for (i = 0; i < 4 && frame->buf[i]; i++)

        if (buffer_needs_copy(s, frame, frame->buf[i]))

            return 1;

    return 0;

}

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

{

    PadContext *s = inlink->dst->priv;

    AVFrame *out;

    int needs_copy = frame_needs_copy(s, in);

    if (needs_copy) {

        av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");

        out = ff_get_video_buffer(inlink->dst->outputs[0],

                                  FFMAX(inlink->w, s->w),

                                  FFMAX(inlink->h, s->h));

        if (!out) {

            av_frame_free(&in);

            return AVERROR(ENOMEM);

        }

        av_frame_copy_props(out, in);

    } else {

        int i;

        out = in;

        for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) {

            int hsub = s->draw.hsub[i];

            int vsub = s->draw.vsub[i];

            out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] +

                            (s->y >> vsub) * out->linesize[i];

        }

    }

    /* top bar */

    if (s->y) {

        ff_fill_rectangle(&s->draw, &s->color,

                          out->data, out->linesize,

                          0, 0, s->w, s->y);

    }

    /* bottom bar */

    if (s->h > s->y + s->in_h) {

        ff_fill_rectangle(&s->draw, &s->color,

                          out->data, out->linesize,

                          0, s->y + s->in_h, s->w, s->h - s->y - s->in_h);

    }

    /* left border */

    ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,

                      0, s->y, s->x, in->height);

    if (needs_copy) {

        ff_copy_rectangle2(&s->draw,

                          out->data, out->linesize, in->data, in->linesize,

                          s->x, s->y, 0, 0, in->width, in->height);

    }

    /* right border */

    ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,

                      s->x + s->in_w, s->y, s->w - s->x - s->in_w,

                      in->height);

    out->width  = s->w;

    out->height = s->h;

    if (in != out)

        av_frame_free(&in);

    return ff_filter_frame(inlink->dst->outputs[0], out);

}

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

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption pad_options[] = {

    { "width",  "set the pad area width expression",       OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "w",      "set the pad area width expression",       OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "height", "set the pad area height expression",      OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "h",      "set the pad area height expression",      OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "x",      "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "y",      "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "color",  "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },

    { NULL }

};

AVFILTER_DEFINE_CLASS(pad);

static const AVFilterPad avfilter_vf_pad_inputs[] = {

    {

        .name             = "default",

        .type             = AVMEDIA_TYPE_VIDEO,

        .config_props     = config_input,

        .get_video_buffer = get_video_buffer,

        .filter_frame     = filter_frame,

    },

    { NULL }

};

static const AVFilterPad avfilter_vf_pad_outputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .config_props = config_output,

    },

    { NULL }

};

AVFilter avfilter_vf_pad = {

    .name          = "pad",

    .description   = NULL_IF_CONFIG_SMALL("Pad the input video."),

    .priv_size     = sizeof(PadContext),

    .priv_class    = &pad_class,

    .query_formats = query_formats,

    .inputs        = avfilter_vf_pad_inputs,

    .outputs       = avfilter_vf_pad_outputs,

};