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ffmpeg / libavfilter / vf_pad.c @ c71e9640

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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 and color source
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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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#include "libavcore/imgutils.h"
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#include "libavcore/parseutils.h"
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enum { RED = 0, GREEN, BLUE, ALPHA };
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static int fill_line_with_color(uint8_t *line[4], int line_step[4], int w, uint8_t color[4],
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                                enum PixelFormat pix_fmt, uint8_t rgba_color[4], int *is_packed_rgba)
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{
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    uint8_t rgba_map[4] = {0};
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    int i;
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    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[pix_fmt];
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    int hsub = pix_desc->log2_chroma_w;
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    *is_packed_rgba = 1;
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    switch (pix_fmt) {
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    case PIX_FMT_ARGB:  rgba_map[ALPHA] = 0; rgba_map[RED  ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
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    case PIX_FMT_ABGR:  rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED  ] = 3; break;
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    case PIX_FMT_RGBA:
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    case PIX_FMT_RGB24: rgba_map[RED  ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
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    case PIX_FMT_BGRA:
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    case PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;
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    default:
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        *is_packed_rgba = 0;
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    }
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    if (*is_packed_rgba) {
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        line_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
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        for (i = 0; i < 4; i++)
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            color[rgba_map[i]] = rgba_color[i];
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        line[0] = av_malloc(w * line_step[0]);
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        for (i = 0; i < w; i++)
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            memcpy(line[0] + i * line_step[0], color, line_step[0]);
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    } else {
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        int plane;
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        color[RED  ] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
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        color[GREEN] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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        color[BLUE ] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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        color[ALPHA] = 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 hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
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            line_step[plane] = 1;
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            line_size = (w >> hsub1) * line_step[plane];
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            line[plane] = av_malloc(line_size);
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            memset(line[plane], color[plane], line_size);
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        }
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    }
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    return 0;
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}
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static void draw_rectangle(AVFilterBufferRef *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 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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#if CONFIG_PAD_FILTER
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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)
139
{
140
    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, -1, ctx) < 0)
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        return AVERROR(EINVAL);
148

    
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    /* sanity check params */
150
    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);
153
    }
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    return 0;
156
}
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static av_cold void uninit(AVFilterContext *ctx)
159
{
160
    PadContext *pad = ctx->priv;
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    int i;
162

    
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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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    }
167
}
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static int config_input(AVFilterLink *inlink)
170
{
171
    AVFilterContext *ctx = inlink->dst;
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    PadContext *pad = ctx->priv;
173
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
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    uint8_t rgba_color[4];
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    int is_packed_rgba;
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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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    fill_line_with_color(pad->line, pad->line_step, pad->w, pad->color,
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                         inlink->format, rgba_color, &is_packed_rgba);
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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_rgba ? "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);
210
    }
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212
    return 0;
213
}
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static int config_output(AVFilterLink *outlink)
216
{
217
    PadContext *pad = outlink->src->priv;
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219
    outlink->w = pad->w;
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    outlink->h = pad->h;
221
    return 0;
222
}
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224
static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
225
{
226
    PadContext *pad = inlink->dst->priv;
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228
    AVFilterBufferRef *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));
231
    int plane;
232

    
233
    picref->video->w = w;
234
    picref->video->h = h;
235

    
236
    for (plane = 0; plane < 4 && picref->data[plane]; plane++) {
237
        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
238
        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
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240
        picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
241
            (pad->y >> vsub) * picref->linesize[plane];
242
    }
243

    
244
    return picref;
245
}
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247
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
248
{
249
    PadContext *pad = inlink->dst->priv;
250
    AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
251
    int plane;
252

    
253
    inlink->dst->outputs[0]->out_buf = outpicref;
254

    
255
    for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
256
        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
257
        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
258

    
259
        outpicref->data[plane] -= (pad->x >> hsub) * pad->line_step[plane] +
260
            (pad->y >> vsub) * outpicref->linesize[plane];
261
    }
262

    
263
    avfilter_start_frame(inlink->dst->outputs[0], outpicref);
264
}
265

    
266
static void end_frame(AVFilterLink *link)
267
{
268
    avfilter_end_frame(link->dst->outputs[0]);
269
    avfilter_unref_buffer(link->cur_buf);
270
}
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272
static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
273
{
274
    PadContext *pad = link->dst->priv;
275
    int bar_y, bar_h = 0;
276

    
277
    if        (slice_dir * before_slice ==  1 && y == pad->y) {
278
        /* top bar */
279
        bar_y = 0;
280
        bar_h = pad->y;
281
    } else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
282
        /* bottom bar */
283
        bar_y = pad->y + pad->in_h;
284
        bar_h = pad->h - pad->in_h - pad->y;
285
    }
286

    
287
    if (bar_h) {
288
        draw_rectangle(link->dst->outputs[0]->out_buf,
289
                       pad->line, pad->line_step, pad->hsub, pad->vsub,
290
                       0, bar_y, pad->w, bar_h);
291
        avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
292
    }
293
}
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295
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
296
{
297
    PadContext *pad = link->dst->priv;
298
    AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf;
299

    
300
    y += pad->y;
301

    
302
    y &= ~((1 << pad->vsub) - 1);
303
    h &= ~((1 << pad->vsub) - 1);
304

    
305
    if (!h)
306
        return;
307
    draw_send_bar_slice(link, y, h, slice_dir, 1);
308

    
309
    /* left border */
310
    draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
311
                   0, y, pad->x, h);
312
    /* right border */
313
    draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
314
                   pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
315
    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
316

    
317
    draw_send_bar_slice(link, y, h, slice_dir, -1);
318
}
319

    
320
AVFilter avfilter_vf_pad = {
321
    .name          = "pad",
322
    .description   = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
323

    
324
    .priv_size     = sizeof(PadContext),
325
    .init          = init,
326
    .uninit        = uninit,
327
    .query_formats = query_formats,
328

    
329
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
330
                                    .type             = AVMEDIA_TYPE_VIDEO,
331
                                    .config_props     = config_input,
332
                                    .get_video_buffer = get_video_buffer,
333
                                    .start_frame      = start_frame,
334
                                    .draw_slice       = draw_slice,
335
                                    .end_frame        = end_frame, },
336
                                  { .name = NULL}},
337

    
338
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
339
                                    .type             = AVMEDIA_TYPE_VIDEO,
340
                                    .config_props     = config_output, },
341
                                  { .name = NULL}},
342
};
343

    
344
#endif /* CONFIG_PAD_FILTER */
345

    
346
#if CONFIG_COLOR_FILTER
347

    
348
typedef struct {
349
    int w, h;
350
    uint8_t color[4];
351
    AVRational time_base;
352
    uint8_t *line[4];
353
    int      line_step[4];
354
    int hsub, vsub;         ///< chroma subsampling values
355
    uint64_t pts;
356
} ColorContext;
357

    
358
static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
359
{
360
    ColorContext *color = ctx->priv;
361
    char color_string[128] = "black";
362
    char frame_size  [128] = "320x240";
363
    char frame_rate  [128] = "25";
364
    AVRational frame_rate_q;
365
    int ret;
366

    
367
    if (args)
368
        sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
369

    
370
    if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
371
        av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
372
        return AVERROR(EINVAL);
373
    }
374

    
375
    if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
376
        frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
377
        av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
378
        return AVERROR(EINVAL);
379
    }
380
    color->time_base.num = frame_rate_q.den;
381
    color->time_base.den = frame_rate_q.num;
382

    
383
    if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0)
384
        return ret;
385

    
386
    return 0;
387
}
388

    
389
static av_cold void color_uninit(AVFilterContext *ctx)
390
{
391
    ColorContext *color = ctx->priv;
392
    int i;
393

    
394
    for (i = 0; i < 4; i++) {
395
        av_freep(&color->line[i]);
396
        color->line_step[i] = 0;
397
    }
398
}
399

    
400
static int color_config_props(AVFilterLink *inlink)
401
{
402
    AVFilterContext *ctx = inlink->src;
403
    ColorContext *color = ctx->priv;
404
    uint8_t rgba_color[4];
405
    int is_packed_rgba;
406
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
407

    
408
    color->hsub = pix_desc->log2_chroma_w;
409
    color->vsub = pix_desc->log2_chroma_h;
410

    
411
    color->w &= ~((1 << color->hsub) - 1);
412
    color->h &= ~((1 << color->vsub) - 1);
413
    if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
414
        return AVERROR(EINVAL);
415

    
416
    memcpy(rgba_color, color->color, sizeof(rgba_color));
417
    fill_line_with_color(color->line, color->line_step, color->w, color->color,
418
                         inlink->format, rgba_color, &is_packed_rgba);
419

    
420
    av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
421
           color->w, color->h, color->time_base.den, color->time_base.num,
422
           color->color[0], color->color[1], color->color[2], color->color[3],
423
           is_packed_rgba ? "rgba" : "yuva");
424
    inlink->w = color->w;
425
    inlink->h = color->h;
426

    
427
    return 0;
428
}
429

    
430
static int color_request_frame(AVFilterLink *link)
431
{
432
    ColorContext *color = link->src->priv;
433
    AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
434
    picref->video->pixel_aspect = (AVRational) {1, 1};
435
    picref->pts                 = av_rescale_q(color->pts++, color->time_base, AV_TIME_BASE_Q);
436
    picref->pos                 = 0;
437

    
438
    avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
439
    draw_rectangle(picref,
440
                   color->line, color->line_step, color->hsub, color->vsub,
441
                   0, 0, color->w, color->h);
442
    avfilter_draw_slice(link, 0, color->h, 1);
443
    avfilter_end_frame(link);
444
    avfilter_unref_buffer(picref);
445

    
446
    return 0;
447
}
448

    
449
AVFilter avfilter_vsrc_color = {
450
    .name        = "color",
451
    .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
452

    
453
    .priv_size = sizeof(ColorContext),
454
    .init      = color_init,
455
    .uninit    = color_uninit,
456

    
457
    .query_formats = query_formats,
458

    
459
    .inputs    = (AVFilterPad[]) {{ .name = NULL}},
460

    
461
    .outputs   = (AVFilterPad[]) {{ .name            = "default",
462
                                    .type            = AVMEDIA_TYPE_VIDEO,
463
                                    .request_frame   = color_request_frame,
464
                                    .config_props    = color_config_props },
465
                                  { .name = NULL}},
466
};
467

    
468
#endif /* CONFIG_COLOR_FILTER */