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ffmpeg / libavfilter / vf_pad.c @ b9f9e59a

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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
{
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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 */
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
{
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    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);
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    }
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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;
218

    
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;
227

    
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
    for (plane = 0; plane < 4 && picref->data[plane]; plane++) {
234
        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
235
        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
236

    
237
        picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
238
            (pad->y >> vsub) * picref->linesize[plane];
239
    }
240

    
241
    return picref;
242
}
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244
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
245
{
246
    PadContext *pad = inlink->dst->priv;
247
    AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
248
    int plane;
249

    
250
    inlink->dst->outputs[0]->out_buf = outpicref;
251

    
252
    for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
253
        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
254
        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
255

    
256
        outpicref->data[plane] -= (pad->x >> hsub) * pad->line_step[plane] +
257
            (pad->y >> vsub) * outpicref->linesize[plane];
258
    }
259

    
260
    avfilter_start_frame(inlink->dst->outputs[0], outpicref);
261
}
262

    
263
static void end_frame(AVFilterLink *link)
264
{
265
    avfilter_end_frame(link->dst->outputs[0]);
266
    avfilter_unref_buffer(link->cur_buf);
267
}
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269
static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
270
{
271
    PadContext *pad = link->dst->priv;
272
    int bar_y, bar_h = 0;
273

    
274
    if        (slice_dir * before_slice ==  1 && y == pad->y) {
275
        /* top bar */
276
        bar_y = 0;
277
        bar_h = pad->y;
278
    } else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
279
        /* bottom bar */
280
        bar_y = pad->y + pad->in_h;
281
        bar_h = pad->h - pad->in_h - pad->y;
282
    }
283

    
284
    if (bar_h) {
285
        draw_rectangle(link->dst->outputs[0]->out_buf,
286
                       pad->line, pad->line_step, pad->hsub, pad->vsub,
287
                       0, bar_y, pad->w, bar_h);
288
        avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
289
    }
290
}
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292
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
293
{
294
    PadContext *pad = link->dst->priv;
295
    AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf;
296

    
297
    y += pad->y;
298

    
299
    y &= ~((1 << pad->vsub) - 1);
300
    h &= ~((1 << pad->vsub) - 1);
301

    
302
    if (!h)
303
        return;
304
    draw_send_bar_slice(link, y, h, slice_dir, 1);
305

    
306
    /* left border */
307
    draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
308
                   0, y, pad->x, h);
309
    /* right border */
310
    draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
311
                   pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
312
    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
313

    
314
    draw_send_bar_slice(link, y, h, slice_dir, -1);
315
}
316

    
317
AVFilter avfilter_vf_pad = {
318
    .name          = "pad",
319
    .description   = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
320

    
321
    .priv_size     = sizeof(PadContext),
322
    .init          = init,
323
    .uninit        = uninit,
324
    .query_formats = query_formats,
325

    
326
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
327
                                    .type             = AVMEDIA_TYPE_VIDEO,
328
                                    .config_props     = config_input,
329
                                    .get_video_buffer = get_video_buffer,
330
                                    .start_frame      = start_frame,
331
                                    .draw_slice       = draw_slice,
332
                                    .end_frame        = end_frame, },
333
                                  { .name = NULL}},
334

    
335
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
336
                                    .type             = AVMEDIA_TYPE_VIDEO,
337
                                    .config_props     = config_output, },
338
                                  { .name = NULL}},
339
};
340

    
341
#endif /* CONFIG_PAD_FILTER */
342

    
343
#if CONFIG_COLOR_FILTER
344

    
345
typedef struct {
346
    int w, h;
347
    uint8_t color[4];
348
    AVRational time_base;
349
    uint8_t *line[4];
350
    int      line_step[4];
351
    int hsub, vsub;         ///< chroma subsampling values
352
    uint64_t pts;
353
} ColorContext;
354

    
355
static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
356
{
357
    ColorContext *color = ctx->priv;
358
    char color_string[128] = "black";
359
    char frame_size  [128] = "320x240";
360
    char frame_rate  [128] = "25";
361
    AVRational frame_rate_q;
362
    int ret;
363

    
364
    if (args)
365
        sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
366

    
367
    if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
368
        av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
369
        return AVERROR(EINVAL);
370
    }
371

    
372
    if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
373
        frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
374
        av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
375
        return AVERROR(EINVAL);
376
    }
377
    color->time_base.num = frame_rate_q.den;
378
    color->time_base.den = frame_rate_q.num;
379

    
380
    if ((ret = av_parse_color(color->color, color_string, ctx)) < 0)
381
        return ret;
382

    
383
    return 0;
384
}
385

    
386
static av_cold void color_uninit(AVFilterContext *ctx)
387
{
388
    ColorContext *color = ctx->priv;
389
    int i;
390

    
391
    for (i = 0; i < 4; i++) {
392
        av_freep(&color->line[i]);
393
        color->line_step[i] = 0;
394
    }
395
}
396

    
397
static int color_config_props(AVFilterLink *inlink)
398
{
399
    AVFilterContext *ctx = inlink->src;
400
    ColorContext *color = ctx->priv;
401
    uint8_t rgba_color[4];
402
    int is_packed_rgba;
403
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
404

    
405
    color->hsub = pix_desc->log2_chroma_w;
406
    color->vsub = pix_desc->log2_chroma_h;
407

    
408
    color->w &= ~((1 << color->hsub) - 1);
409
    color->h &= ~((1 << color->vsub) - 1);
410
    if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
411
        return AVERROR(EINVAL);
412

    
413
    memcpy(rgba_color, color->color, sizeof(rgba_color));
414
    fill_line_with_color(color->line, color->line_step, color->w, color->color,
415
                         inlink->format, rgba_color, &is_packed_rgba);
416

    
417
    av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
418
           color->w, color->h, color->time_base.den, color->time_base.num,
419
           color->color[0], color->color[1], color->color[2], color->color[3],
420
           is_packed_rgba ? "rgba" : "yuva");
421
    inlink->w = color->w;
422
    inlink->h = color->h;
423

    
424
    return 0;
425
}
426

    
427
static int color_request_frame(AVFilterLink *link)
428
{
429
    ColorContext *color = link->src->priv;
430
    AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
431
    picref->video->pixel_aspect = (AVRational) {1, 1};
432
    picref->pts                 = av_rescale_q(color->pts++, color->time_base, AV_TIME_BASE_Q);
433
    picref->pos                 = 0;
434

    
435
    avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
436
    draw_rectangle(picref,
437
                   color->line, color->line_step, color->hsub, color->vsub,
438
                   0, 0, color->w, color->h);
439
    avfilter_draw_slice(link, 0, color->h, 1);
440
    avfilter_end_frame(link);
441
    avfilter_unref_buffer(picref);
442

    
443
    return 0;
444
}
445

    
446
AVFilter avfilter_vsrc_color = {
447
    .name        = "color",
448
    .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
449

    
450
    .priv_size = sizeof(ColorContext),
451
    .init      = color_init,
452
    .uninit    = color_uninit,
453

    
454
    .query_formats = query_formats,
455

    
456
    .inputs    = (AVFilterPad[]) {{ .name = NULL}},
457

    
458
    .outputs   = (AVFilterPad[]) {{ .name            = "default",
459
                                    .type            = AVMEDIA_TYPE_VIDEO,
460
                                    .request_frame   = color_request_frame,
461
                                    .config_props    = color_config_props },
462
                                  { .name = NULL}},
463
};
464

    
465
#endif /* CONFIG_COLOR_FILTER */