libavfilter/vf_swaprect.c

   1 /*
   2  * Copyright (c) 2015 Paul B. Mahol
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/avassert.h"
  22 #include "libavutil/eval.h"
  23 #include "libavutil/imgutils.h"
  24 #include "libavutil/mem.h"
  25 #include "libavutil/opt.h"
  26
  27 #include "avfilter.h"
  28 #include "filters.h"
  29 #include "formats.h"
  30 #include "video.h"
  31
  32 typedef struct SwapRectContext {
  33     const AVClass *class;
  34     char *w, *h;
  35     char *x1, *y1;
  36     char *x2, *y2;
  37
  38     int nb_planes;
  39     int pixsteps[4];
  40
  41     const AVPixFmtDescriptor *desc;
  42     uint8_t *temp;
  43 } SwapRectContext;
  44
  45 #define OFFSET(x) offsetof(SwapRectContext, x)
  46 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
  47 static const AVOption swaprect_options[] = {
  48     { "w",  "set rect width",                     OFFSET(w),  AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
  49     { "h",  "set rect height",                    OFFSET(h),  AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
  50     { "x1", "set 1st rect x top left coordinate", OFFSET(x1), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
  51     { "y1", "set 1st rect y top left coordinate", OFFSET(y1), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
  52     { "x2", "set 2nd rect x top left coordinate", OFFSET(x2), AV_OPT_TYPE_STRING, {.str="0"},   0, 0, .flags = FLAGS },
  53     { "y2", "set 2nd rect y top left coordinate", OFFSET(y2), AV_OPT_TYPE_STRING, {.str="0"},   0, 0, .flags = FLAGS },
  54     { NULL },
  55 };
  56
  57 AVFILTER_DEFINE_CLASS(swaprect);
  58
  59 static int query_formats(const AVFilterContext *ctx,
  60                          AVFilterFormatsConfig **cfg_in,
  61                          AVFilterFormatsConfig **cfg_out)
  62 {
  63     int reject_flags = AV_PIX_FMT_FLAG_PAL     |
  64                        AV_PIX_FMT_FLAG_HWACCEL |
  65                        AV_PIX_FMT_FLAG_BITSTREAM;
  66
  67     return ff_set_common_formats2(ctx, cfg_in, cfg_out,
  68                                   ff_formats_pixdesc_filter(0, reject_flags));
  69 }
  70
  71 static const char *const var_names[] = {   "w",   "h",   "a",   "n",   "t",
  72 #if FF_API_FRAME_PKT
  73                                                                            "pos",
  74 #endif
  75                                                                                       "sar",   "dar",        NULL };
  76 enum                                   { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T,
  77 #if FF_API_FRAME_PKT
  78                                                                            VAR_POS,
  79 #endif
  80                                                                                     VAR_SAR, VAR_DAR, VAR_VARS_NB };
  81
  82 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
  83 {
  84     FilterLink *inl = ff_filter_link(inlink);
  85     AVFilterContext *ctx = inlink->dst;
  86     AVFilterLink *outlink = ctx->outputs[0];
  87     SwapRectContext *s = ctx->priv;
  88     double var_values[VAR_VARS_NB];
  89     int x1[4], y1[4];
  90     int x2[4], y2[4];
  91     int aw[4], ah[4];
  92     int lw[4], lh[4];
  93     int pw[4], ph[4];
  94     double dw,  dh;
  95     double dx1, dy1;
  96     double dx2, dy2;
  97     int y, p, w, h, ret;
  98
  99     var_values[VAR_W]   = inlink->w;
 100     var_values[VAR_H]   = inlink->h;
 101     var_values[VAR_A]   = (float) inlink->w / inlink->h;
 102     var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
 103     var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
 104     var_values[VAR_N]   = inl->frame_count_out;
 105     var_values[VAR_T]   = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
 106 #if FF_API_FRAME_PKT
 107 FF_DISABLE_DEPRECATION_WARNINGS
 108     var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
 109 FF_ENABLE_DEPRECATION_WARNINGS
 110 #endif
 111
 112     ret = av_expr_parse_and_eval(&dw, s->w,
 113                                  var_names, &var_values[0],
 114                                  NULL, NULL, NULL, NULL,
 115                                  0, 0, ctx);
 116     if (ret < 0)
 117         return ret;
 118
 119     ret = av_expr_parse_and_eval(&dh, s->h,
 120                                  var_names, &var_values[0],
 121                                  NULL, NULL, NULL, NULL,
 122                                  0, 0, ctx);
 123     if (ret < 0)
 124         return ret;
 125
 126     ret = av_expr_parse_and_eval(&dx1, s->x1,
 127                                  var_names, &var_values[0],
 128                                  NULL, NULL, NULL, NULL,
 129                                  0, 0, ctx);
 130     if (ret < 0)
 131         return ret;
 132
 133     ret = av_expr_parse_and_eval(&dy1, s->y1,
 134                                  var_names, &var_values[0],
 135                                  NULL, NULL, NULL, NULL,
 136                                  0, 0, ctx);
 137     if (ret < 0)
 138         return ret;
 139
 140     ret = av_expr_parse_and_eval(&dx2, s->x2,
 141                                  var_names, &var_values[0],
 142                                  NULL, NULL, NULL, NULL,
 143                                  0, 0, ctx);
 144     if (ret < 0)
 145         return ret;
 146
 147     ret = av_expr_parse_and_eval(&dy2, s->y2,
 148                                  var_names, &var_values[0],
 149                                  NULL, NULL, NULL, NULL,
 150                                  0, 0, ctx);
 151     if (ret < 0)
 152         return ret;
 153
 154     w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
 155
 156     x1[0] = av_clip(x1[0], 0, inlink->w - 1);
 157     y1[0] = av_clip(y1[0], 0, inlink->h - 1);
 158
 159     x2[0] = av_clip(x2[0], 0, inlink->w - 1);
 160     y2[0] = av_clip(y2[0], 0, inlink->h - 1);
 161
 162     ah[1] = ah[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
 163     ah[0] = ah[3] = h;
 164     aw[1] = aw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
 165     aw[0] = aw[3] = w;
 166
 167     w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
 168     h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
 169
 170     ph[1] = ph[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
 171     ph[0] = ph[3] = h;
 172     pw[1] = pw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
 173     pw[0] = pw[3] = w;
 174
 175     lh[1] = lh[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
 176     lh[0] = lh[3] = inlink->h;
 177     lw[1] = lw[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
 178     lw[0] = lw[3] = inlink->w;
 179
 180     x1[1] = x1[2] = (x1[0] >> s->desc->log2_chroma_w);
 181     x1[0] = x1[3] = x1[0];
 182     y1[1] = y1[2] = (y1[0] >> s->desc->log2_chroma_h);
 183     y1[0] = y1[3] = y1[0];
 184
 185     x2[1] = x2[2] = (x2[0] >> s->desc->log2_chroma_w);
 186     x2[0] = x2[3] = x2[0];
 187     y2[1] = y2[2] = (y2[0] >> s->desc->log2_chroma_h);
 188     y2[0] = y2[3] = y2[0];
 189
 190
 191     av_assert0(FFMAX(x1[1], x2[1]) + pw[1] <= lw[1]);
 192     av_assert0(FFMAX(y1[1], y2[1]) + ph[1] <= lh[1]);
 193
 194     for (p = 0; p < s->nb_planes; p++) {
 195         if (ph[p] == ah[p] && pw[p] == aw[p]) {
 196             uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
 197             uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
 198
 199             for (y = 0; y < ph[p]; y++) {
 200                 memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
 201                 memmove(src, dst, pw[p] * s->pixsteps[p]);
 202                 memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
 203                 src += in->linesize[p];
 204                 dst += in->linesize[p];
 205             }
 206         }
 207     }
 208
 209     return ff_filter_frame(outlink, in);
 210 }
 211
 212 static int config_input(AVFilterLink *inlink)
 213 {
 214     AVFilterContext *ctx = inlink->dst;
 215     SwapRectContext *s = ctx->priv;
 216
 217     if (!s->w  || !s->h  ||
 218         !s->x1 || !s->y1 ||
 219         !s->x2 || !s->y2)
 220         return AVERROR(EINVAL);
 221
 222     s->desc = av_pix_fmt_desc_get(inlink->format);
 223     av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
 224     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
 225
 226     s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
 227     if (!s->temp)
 228         return AVERROR(ENOMEM);
 229
 230     return 0;
 231 }
 232
 233 static av_cold void uninit(AVFilterContext *ctx)
 234 {
 235     SwapRectContext *s = ctx->priv;
 236     av_freep(&s->temp);
 237 }
 238
 239 static const AVFilterPad inputs[] = {
 240     {
 241         .name           = "default",
 242         .type           = AVMEDIA_TYPE_VIDEO,
 243         .flags          = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
 244         .filter_frame   = filter_frame,
 245         .config_props   = config_input,
 246     },
 247 };
 248
 249 const FFFilter ff_vf_swaprect = {
 250     .p.name        = "swaprect",
 251     .p.description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
 252     .p.priv_class  = &swaprect_class,
 253     .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
 254     .priv_size     = sizeof(SwapRectContext),
 255     .uninit        = uninit,
 256     FILTER_INPUTS(inputs),
 257     FILTER_OUTPUTS(ff_video_default_filterpad),
 258     FILTER_QUERY_FUNC2(query_formats),
 259     .process_command = ff_filter_process_command,
 260 };