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ffmpeg / libavfilter / vf_pad.c @ 478b9d74

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/*
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 * copyright (c) 2008 vmrsss
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 * copyright (c) 2009 Stefano Sabatini
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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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 * video padding filter
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 */
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#include "avfilter.h"
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#include "parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/colorspace.h"
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typedef struct {
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    int w, h;               ///< output dimensions, a value of 0 will result in the input size
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    int x, y;               ///< offsets of the input area with respect to the padded area
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    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
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    uint8_t color[4];       ///< color expressed either in YUVA or RGBA colorspace for the padding area
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    uint8_t *line[4];
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    int      line_step[4];
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    int hsub, vsub;         ///< chroma subsampling values
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} PadContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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    PadContext *pad = ctx->priv;
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    char color_string[128] = "black";
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    if (args)
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        sscanf(args, "%d:%d:%d:%d:%s", &pad->w, &pad->h, &pad->x, &pad->y, color_string);
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    if (av_parse_color(pad->color, color_string, ctx) < 0)
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        return AVERROR(EINVAL);
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    /* sanity check params */
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    if (pad->w < 0 || pad->h < 0) {
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        av_log(ctx, AV_LOG_ERROR, "Negative size values are not acceptable.\n");
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        return AVERROR(EINVAL);
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    }
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    return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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    PadContext *pad = ctx->priv;
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    int i;
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    for (i = 0; i < 4; i++) {
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        av_freep(&pad->line[i]);
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        pad->line_step[i] = 0;
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    }
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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 PixelFormat pix_fmts[] = {
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        PIX_FMT_ARGB,         PIX_FMT_RGBA,
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        PIX_FMT_ABGR,         PIX_FMT_BGRA,
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        PIX_FMT_RGB24,        PIX_FMT_BGR24,
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        PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
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        PIX_FMT_YUV420P,      PIX_FMT_YUV411P,
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        PIX_FMT_YUV410P,      PIX_FMT_YUV440P,
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        PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
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        PIX_FMT_YUVJ420P,     PIX_FMT_YUVJ440P,
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        PIX_FMT_YUVA420P,
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        PIX_FMT_NONE
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    };
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    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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    return 0;
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}
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enum { RED = 0, GREEN, BLUE, ALPHA };
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static int config_input(AVFilterLink *inlink)
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{
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    AVFilterContext *ctx = inlink->dst;
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    PadContext *pad = ctx->priv;
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    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
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    uint8_t rgba_color[4];
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    uint8_t rgba_map[4] = {0};
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    int i, is_packed_rgb = 1;
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    switch (inlink->format) {
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    case PIX_FMT_ARGB:
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        rgba_map[ALPHA] = 0; rgba_map[RED] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE] = 3;
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        break;
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    case PIX_FMT_ABGR:
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        rgba_map[ALPHA] = 0; rgba_map[BLUE] = 1; rgba_map[GREEN] = 2; rgba_map[RED] = 3;
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        break;
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    case PIX_FMT_RGBA:
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    case PIX_FMT_RGB24:
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        rgba_map[RED] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE] = 2; rgba_map[ALPHA] = 3;
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        break;
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    case PIX_FMT_BGRA:
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    case PIX_FMT_BGR24:
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        rgba_map[BLUE] = 0; rgba_map[GREEN] = 1; rgba_map[RED] = 2; rgba_map[ALPHA] = 3;
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        break;
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    default:
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        is_packed_rgb = 0;
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    }
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    pad->hsub = pix_desc->log2_chroma_w;
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    pad->vsub = pix_desc->log2_chroma_h;
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    if (!pad->w)
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        pad->w = inlink->w;
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    if (!pad->h)
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        pad->h = inlink->h;
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    pad->w &= ~((1 << pad->hsub) - 1);
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    pad->h &= ~((1 << pad->vsub) - 1);
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    pad->x &= ~((1 << pad->hsub) - 1);
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    pad->y &= ~((1 << pad->vsub) - 1);
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    pad->in_w = inlink->w & ~((1 << pad->hsub) - 1);
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    pad->in_h = inlink->h & ~((1 << pad->vsub) - 1);
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    memcpy(rgba_color, pad->color, sizeof(rgba_color));
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    if (is_packed_rgb) {
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        pad->line_step[0] = (av_get_bits_per_pixel(&av_pix_fmt_descriptors[inlink->format]))>>3;
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        for (i = 0; i < 4; i++)
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            pad->color[rgba_map[i]] = rgba_color[i];
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        pad->line[0] = av_malloc(pad->w * pad->line_step[0]);
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        for (i = 0; i < pad->w; i++)
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            memcpy(pad->line[0] + i * pad->line_step[0], pad->color, pad->line_step[0]);
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    } else {
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        int plane;
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        pad->color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
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        pad->color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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        pad->color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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        pad->color[3] = rgba_color[3];
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        for (plane = 0; plane < 4; plane++) {
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            int line_size;
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            int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
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            pad->line_step[plane] = 1;
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            line_size = (pad->w >> hsub) * pad->line_step[plane];
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            pad->line[plane] = av_malloc(line_size);
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            memset(pad->line[plane], pad->color[plane], line_size);
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        }
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    }
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    av_log(ctx, AV_LOG_INFO, "w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X[%s]\n",
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           pad->w, pad->h, pad->x, pad->y,
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           pad->color[0], pad->color[1], pad->color[2], pad->color[3],
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           is_packed_rgb ? "rgba" : "yuva");
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    if (pad->x <  0 || pad->y <  0                      ||
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        pad->w <= 0 || pad->h <= 0                      ||
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        (unsigned)pad->x + (unsigned)inlink->w > pad->w ||
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        (unsigned)pad->y + (unsigned)inlink->h > pad->h) {
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        av_log(ctx, AV_LOG_ERROR,
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               "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
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               pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h);
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        return AVERROR(EINVAL);
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    }
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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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    PadContext *pad = outlink->src->priv;
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    outlink->w = pad->w;
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    outlink->h = pad->h;
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    return 0;
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}
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static AVFilterPicRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
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{
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    PadContext *pad = inlink->dst->priv;
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    AVFilterPicRef *picref = avfilter_get_video_buffer(inlink->dst->outputs[0], perms,
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                                                       w + (pad->w - pad->in_w),
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                                                       h + (pad->h - pad->in_h));
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    int plane;
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    for (plane = 0; plane < 4 && picref->data[plane]; plane++) {
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        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
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        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
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        picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
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            (pad->y >> vsub) * picref->linesize[plane];
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    }
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    return picref;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterPicRef *inpicref)
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{
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    PadContext *pad = inlink->dst->priv;
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    AVFilterPicRef *outpicref = avfilter_ref_pic(inpicref, ~0);
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    int plane;
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    inlink->dst->outputs[0]->outpic = outpicref;
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    for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
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        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
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        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
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        outpicref->data[plane] -= (pad->x >> hsub) * pad->line_step[plane] +
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            (pad->y >> vsub) * outpicref->linesize[plane];
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    }
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    avfilter_start_frame(inlink->dst->outputs[0], outpicref);
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}
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static void end_frame(AVFilterLink *link)
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{
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    avfilter_end_frame(link->dst->outputs[0]);
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    avfilter_unref_pic(link->cur_pic);
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}
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static void draw_rectangle(AVFilterPicRef *outpic, uint8_t *line[4], int line_step[4],
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                           int hsub, int vsub, int x, int y, int w, int h)
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{
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    int i, plane;
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    uint8_t *p;
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    for (plane = 0; plane < 4 && outpic->data[plane]; plane++) {
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        int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
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        int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
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        p = outpic->data[plane] + (y >> vsub1) * outpic->linesize[plane];
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        for (i = 0; i < (h >> vsub1); i++) {
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            memcpy(p + (x >> hsub1) * line_step[plane], line[plane], (w >> hsub1) * line_step[plane]);
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            p += outpic->linesize[plane];
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        }
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    }
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}
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static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
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{
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    PadContext *pad = link->dst->priv;
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    int bar_y, bar_h = 0;
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    if        (slice_dir * before_slice ==  1 && y == pad->y) {
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        /* top bar */
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        bar_y = 0;
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        bar_h = pad->y;
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    } else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
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        /* bottom bar */
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        bar_y = pad->y + pad->in_h;
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        bar_h = pad->h - pad->in_h - pad->y;
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    }
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    if (bar_h) {
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        draw_rectangle(link->dst->outputs[0]->outpic,
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                       pad->line, pad->line_step, pad->hsub, pad->vsub,
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                       0, bar_y, pad->w, bar_h);
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        avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
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    }
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}
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static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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    PadContext *pad = link->dst->priv;
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    AVFilterPicRef *outpic = link->dst->outputs[0]->outpic;
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    y += pad->y;
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    y &= ~((1 << pad->vsub) - 1);
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    h &= ~((1 << pad->vsub) - 1);
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    if (!h)
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        return;
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    draw_send_bar_slice(link, y, h, slice_dir, 1);
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    /* left border */
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    draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
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                   0, y, pad->x, h);
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    /* right border */
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    draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
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                   pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
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    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
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    draw_send_bar_slice(link, y, h, slice_dir, -1);
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}
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AVFilter avfilter_vf_pad = {
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    .name          = "pad",
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    .description   = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
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    .priv_size     = sizeof(PadContext),
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    .init          = init,
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    .uninit        = uninit,
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    .query_formats = query_formats,
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    .inputs    = (AVFilterPad[]) {{ .name             = "default",
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                                    .type             = AVMEDIA_TYPE_VIDEO,
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                                    .config_props     = config_input,
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                                    .get_video_buffer = get_video_buffer,
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                                    .start_frame      = start_frame,
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                                    .draw_slice       = draw_slice,
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                                    .end_frame        = end_frame, },
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                                  { .name = NULL}},
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    .outputs   = (AVFilterPad[]) {{ .name             = "default",
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                                    .type             = AVMEDIA_TYPE_VIDEO,
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                                    .config_props     = config_output, },
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                                  { .name = NULL}},
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};