GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/vf_alphamerge.c Lines: 57 63 90.5 %
Date: 2020-10-23 17:01:47 Branches: 16 27 59.3 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2012 Steven Robertson
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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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/**
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 * @file
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 * copy an alpha component from another video's luma
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 */
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#include <string.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixfmt.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#include "formats.h"
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#include "filters.h"
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#include "framesync.h"
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#include "internal.h"
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#include "video.h"
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enum { Y, U, V, A };
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typedef struct AlphaMergeContext {
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    const AVClass *class;
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    int is_packed_rgb;
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    uint8_t rgba_map[4];
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    FFFrameSync fs;
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} AlphaMergeContext;
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static int do_alphamerge(FFFrameSync *fs)
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{
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    AVFilterContext *ctx = fs->parent;
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    AlphaMergeContext *s = ctx->priv;
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    AVFrame *main_buf, *alpha_buf;
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    int ret;
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    ret = ff_framesync_dualinput_get_writable(fs, &main_buf, &alpha_buf);
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    if (ret < 0)
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        return ret;
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    if (!alpha_buf)
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        return ff_filter_frame(ctx->outputs[0], main_buf);
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    if (s->is_packed_rgb) {
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        int x, y;
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        uint8_t *pin, *pout;
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        for (y = 0; y < main_buf->height; y++) {
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            pin = alpha_buf->data[0] + y * alpha_buf->linesize[0];
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            pout = main_buf->data[0] + y * main_buf->linesize[0] + s->rgba_map[A];
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            for (x = 0; x < main_buf->width; x++) {
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                *pout = *pin;
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                pin += 1;
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                pout += 4;
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            }
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        }
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    } else {
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        const int main_linesize = main_buf->linesize[A];
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        const int alpha_linesize = alpha_buf->linesize[Y];
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        av_image_copy_plane(main_buf->data[A], main_linesize,
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                            alpha_buf->data[Y], alpha_linesize,
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                            FFMIN(main_linesize, alpha_linesize), alpha_buf->height);
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    }
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    return ff_filter_frame(ctx->outputs[0], main_buf);
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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    AlphaMergeContext *s = ctx->priv;
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    s->fs.on_event = do_alphamerge;
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    return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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    static const enum AVPixelFormat main_fmts[] = {
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        AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
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        AV_PIX_FMT_GBRAP,
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        AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
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        AV_PIX_FMT_NONE
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    };
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    static const enum AVPixelFormat alpha_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
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    AVFilterFormats *main_formats = ff_make_format_list(main_fmts);
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    int ret;
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    if ((ret = ff_formats_ref(main_formats, &ctx->inputs[0]->outcfg.formats)) < 0 ||
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        (ret = ff_formats_ref(main_formats, &ctx->outputs[0]->incfg.formats)) < 0)
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            return ret;
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    return ff_formats_ref(ff_make_format_list(alpha_fmts),
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                          &ctx->inputs[1]->outcfg.formats);
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}
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static int config_input_main(AVFilterLink *inlink)
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{
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    AlphaMergeContext *s = inlink->dst->priv;
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    s->is_packed_rgb =
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        ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0 &&
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        inlink->format != AV_PIX_FMT_GBRAP;
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    return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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    AlphaMergeContext *s = ctx->priv;
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    AVFilterLink *mainlink = ctx->inputs[0];
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    AVFilterLink *alphalink = ctx->inputs[1];
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    int ret;
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    if (mainlink->w != alphalink->w || mainlink->h != alphalink->h) {
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        av_log(ctx, AV_LOG_ERROR,
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               "Input frame sizes do not match (%dx%d vs %dx%d).\n",
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               mainlink->w, mainlink->h,
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               alphalink->w, alphalink->h);
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        return AVERROR(EINVAL);
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    }
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    if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
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        return ret;
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    outlink->w = mainlink->w;
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    outlink->h = mainlink->h;
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    outlink->time_base = mainlink->time_base;
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    outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
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    outlink->frame_rate = mainlink->frame_rate;
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    return ff_framesync_configure(&s->fs);
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}
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static int activate(AVFilterContext *ctx)
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{
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    AlphaMergeContext *s = ctx->priv;
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    return ff_framesync_activate(&s->fs);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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    AlphaMergeContext *s = ctx->priv;
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    ff_framesync_uninit(&s->fs);
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}
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static const AVFilterPad alphamerge_inputs[] = {
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    {
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        .name             = "main",
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        .type             = AVMEDIA_TYPE_VIDEO,
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        .config_props     = config_input_main,
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    },{
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        .name             = "alpha",
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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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static const AVFilterPad alphamerge_outputs[] = {
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    {
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        .name          = "default",
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        .type          = AVMEDIA_TYPE_VIDEO,
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        .config_props  = config_output,
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    },
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    { NULL }
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};
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static const AVOption alphamerge_options[] = {
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    { NULL }
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};
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FRAMESYNC_DEFINE_CLASS(alphamerge, AlphaMergeContext, fs);
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AVFilter ff_vf_alphamerge = {
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    .name           = "alphamerge",
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    .description    = NULL_IF_CONFIG_SMALL("Copy the luma value of the second "
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                      "input into the alpha channel of the first input."),
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    .preinit        = alphamerge_framesync_preinit,
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    .priv_size      = sizeof(AlphaMergeContext),
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    .priv_class     = &alphamerge_class,
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    .init           = init,
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    .query_formats  = query_formats,
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    .inputs         = alphamerge_inputs,
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    .outputs        = alphamerge_outputs,
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    .uninit         = uninit,
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    .activate       = activate,
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    .flags          = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
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};