GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/vf_addroi.c Lines: 0 87 0.0 %
Date: 2020-09-25 14:59:26 Branches: 0 33 0.0 %

Line Branch Exec Source
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/*
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/avassert.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "internal.h"
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enum {
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    X, Y, W, H,
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    NB_PARAMS,
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};
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static const char *addroi_param_names[] = {
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    "x", "y", "w", "h",
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};
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enum {
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    VAR_IW,
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    VAR_IH,
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    NB_VARS,
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};
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static const char *const addroi_var_names[] = {
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    "iw",
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    "ih",
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};
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typedef struct AddROIContext {
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    const AVClass *class;
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    char   *region_str[NB_PARAMS];
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    AVExpr *region_expr[NB_PARAMS];
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    int region[NB_PARAMS];
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    AVRational qoffset;
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    int clear;
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} AddROIContext;
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static int addroi_config_input(AVFilterLink *inlink)
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{
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    AVFilterContext *avctx = inlink->dst;
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    AddROIContext     *ctx = avctx->priv;
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    int i;
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    double vars[NB_VARS];
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    double val;
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    vars[VAR_IW] = inlink->w;
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    vars[VAR_IH] = inlink->h;
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    for (i = 0; i < NB_PARAMS; i++) {
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        int max_value;
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        switch (i) {
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        case X: max_value = inlink->w;                  break;
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        case Y: max_value = inlink->h;                  break;
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        case W: max_value = inlink->w - ctx->region[X]; break;
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        case H: max_value = inlink->h - ctx->region[Y]; break;
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        }
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        val = av_expr_eval(ctx->region_expr[i], vars, NULL);
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        if (val < 0.0) {
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            av_log(avctx, AV_LOG_WARNING, "Calculated value %g for %s is "
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                   "less than zero - using zero instead.\n", val,
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                   addroi_param_names[i]);
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            val = 0.0;
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        } else if (val > max_value) {
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            av_log(avctx, AV_LOG_WARNING, "Calculated value %g for %s is "
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                   "greater than maximum allowed value %d - "
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                   "using %d instead.\n", val, addroi_param_names[i],
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                   max_value, max_value);
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            val = max_value;
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        }
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        ctx->region[i] = val;
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    }
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    return 0;
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}
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static int addroi_filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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    AVFilterContext *avctx = inlink->dst;
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    AVFilterLink  *outlink = avctx->outputs[0];
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    AddROIContext     *ctx = avctx->priv;
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    AVRegionOfInterest *roi;
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    AVFrameSideData *sd;
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    int err;
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    if (ctx->clear) {
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        av_frame_remove_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
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        sd = NULL;
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    } else {
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        sd = av_frame_get_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
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    }
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    if (sd) {
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        const AVRegionOfInterest *old_roi;
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        uint32_t old_roi_size;
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        AVBufferRef *roi_ref;
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        int nb_roi, i;
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        old_roi = (const AVRegionOfInterest*)sd->data;
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        old_roi_size = old_roi->self_size;
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        av_assert0(old_roi_size && sd->size % old_roi_size == 0);
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        nb_roi = sd->size / old_roi_size + 1;
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        roi_ref = av_buffer_alloc(sizeof(*roi) * nb_roi);
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        if (!roi_ref) {
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            err = AVERROR(ENOMEM);
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            goto fail;
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        }
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        roi = (AVRegionOfInterest*)roi_ref->data;
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        for (i = 0; i < nb_roi - 1; i++) {
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            old_roi = (const AVRegionOfInterest*)
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                (sd->data + old_roi_size * i);
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            roi[i] = (AVRegionOfInterest) {
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                .self_size = sizeof(*roi),
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                .top       = old_roi->top,
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                .bottom    = old_roi->bottom,
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                .left      = old_roi->left,
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                .right     = old_roi->right,
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                .qoffset   = old_roi->qoffset,
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            };
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        }
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        roi[nb_roi - 1] = (AVRegionOfInterest) {
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            .self_size = sizeof(*roi),
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            .top       = ctx->region[Y],
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            .bottom    = ctx->region[Y] + ctx->region[H],
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            .left      = ctx->region[X],
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            .right     = ctx->region[X] + ctx->region[W],
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            .qoffset   = ctx->qoffset,
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        };
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        av_frame_remove_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
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        sd = av_frame_new_side_data_from_buf(frame,
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                                             AV_FRAME_DATA_REGIONS_OF_INTEREST,
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                                             roi_ref);
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        if (!sd) {
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            av_buffer_unref(&roi_ref);
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            err = AVERROR(ENOMEM);
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            goto fail;
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        }
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    } else {
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        sd = av_frame_new_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST,
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                                    sizeof(AVRegionOfInterest));
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        if (!sd) {
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            err = AVERROR(ENOMEM);
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            goto fail;
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        }
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        roi = (AVRegionOfInterest*)sd->data;
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        *roi = (AVRegionOfInterest) {
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            .self_size = sizeof(*roi),
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            .top       = ctx->region[Y],
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            .bottom    = ctx->region[Y] + ctx->region[H],
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            .left      = ctx->region[X],
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            .right     = ctx->region[X] + ctx->region[W],
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            .qoffset   = ctx->qoffset,
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        };
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    }
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    return ff_filter_frame(outlink, frame);
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fail:
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    av_frame_free(&frame);
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    return err;
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}
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static av_cold int addroi_init(AVFilterContext *avctx)
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{
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    AddROIContext *ctx = avctx->priv;
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    int i, err;
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    for (i = 0; i < NB_PARAMS; i++) {
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        err = av_expr_parse(&ctx->region_expr[i], ctx->region_str[i],
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                            addroi_var_names, NULL, NULL, NULL, NULL,
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                            0, avctx);
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        if (err < 0) {
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            av_log(ctx, AV_LOG_ERROR,
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                   "Error parsing %s expression '%s'.\n",
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                   addroi_param_names[i], ctx->region_str[i]);
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            return err;
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        }
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    }
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    return 0;
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}
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static av_cold void addroi_uninit(AVFilterContext *avctx)
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{
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    AddROIContext *ctx = avctx->priv;
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    int i;
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    for (i = 0; i < NB_PARAMS; i++) {
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        av_expr_free(ctx->region_expr[i]);
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        ctx->region_expr[i] = NULL;
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    }
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}
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#define OFFSET(x) offsetof(AddROIContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption addroi_options[] = {
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    { "x", "Region distance from left edge of frame.",
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      OFFSET(region_str[X]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "y", "Region distance from top edge of frame.",
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      OFFSET(region_str[Y]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "w", "Region width.",
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      OFFSET(region_str[W]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "h", "Region height.",
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      OFFSET(region_str[H]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "qoffset", "Quantisation offset to apply in the region.",
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      OFFSET(qoffset), AV_OPT_TYPE_RATIONAL, { .dbl = -0.1 }, -1, +1, FLAGS },
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    { "clear", "Remove any existing regions of interest before adding the new one.",
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      OFFSET(clear), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(addroi);
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static const AVFilterPad addroi_inputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_VIDEO,
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        .config_props = addroi_config_input,
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        .filter_frame = addroi_filter_frame,
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    },
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    { NULL }
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};
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static const AVFilterPad addroi_outputs[] = {
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    {
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        .name = "default",
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        .type = AVMEDIA_TYPE_VIDEO,
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    },
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    { NULL }
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};
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AVFilter ff_vf_addroi = {
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    .name        = "addroi",
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    .description = NULL_IF_CONFIG_SMALL("Add region of interest to frame."),
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    .init        = addroi_init,
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    .uninit      = addroi_uninit,
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    .priv_size   = sizeof(AddROIContext),
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    .priv_class  = &addroi_class,
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    .inputs      = addroi_inputs,
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    .outputs     = addroi_outputs,
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};