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vf_tile.c
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1 /*
2  * Copyright (c) 2012 Nicolas George
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 /**
22  * @file
23  * tile video filter
24  */
25 
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "avfilter.h"
29 #include "drawutils.h"
30 #include "formats.h"
31 #include "video.h"
32 #include "internal.h"
33 
34 typedef struct {
35  const AVClass *class;
36  unsigned w, h;
37  unsigned margin;
38  unsigned padding;
39  unsigned current;
40  unsigned nb_frames;
44  uint8_t rgba_color[4];
45 } TileContext;
46 
47 #define REASONABLE_SIZE 1024
48 
49 #define OFFSET(x) offsetof(TileContext, x)
50 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
51 
52 static const AVOption tile_options[] = {
53  { "layout", "set grid size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE,
54  {.str = "6x5"}, 0, 0, FLAGS },
55  { "nb_frames", "set maximum number of frame to render", OFFSET(nb_frames),
56  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
57  { "margin", "set outer border margin in pixels", OFFSET(margin),
58  AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
59  { "padding", "set inner border thickness in pixels", OFFSET(padding),
60  AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
61  { "color", "set the color of the unused area", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
62  { NULL }
63 };
64 
66 
67 static av_cold int init(AVFilterContext *ctx)
68 {
69  TileContext *tile = ctx->priv;
70 
71  if (tile->w > REASONABLE_SIZE || tile->h > REASONABLE_SIZE) {
72  av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",
73  tile->w, tile->h);
74  return AVERROR(EINVAL);
75  }
76 
77  if (tile->nb_frames == 0) {
78  tile->nb_frames = tile->w * tile->h;
79  } else if (tile->nb_frames > tile->w * tile->h) {
80  av_log(ctx, AV_LOG_ERROR, "nb_frames must be less than or equal to %dx%d=%d\n",
81  tile->w, tile->h, tile->w * tile->h);
82  return AVERROR(EINVAL);
83  }
84 
85  return 0;
86 }
87 
89 {
91  return 0;
92 }
93 
94 static int config_props(AVFilterLink *outlink)
95 {
96  AVFilterContext *ctx = outlink->src;
97  TileContext *tile = ctx->priv;
98  AVFilterLink *inlink = ctx->inputs[0];
99  const unsigned total_margin_w = (tile->w - 1) * tile->padding + 2*tile->margin;
100  const unsigned total_margin_h = (tile->h - 1) * tile->padding + 2*tile->margin;
101 
102  if (inlink->w > (INT_MAX - total_margin_w) / tile->w) {
103  av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",
104  tile->w, inlink->w);
105  return AVERROR(EINVAL);
106  }
107  if (inlink->h > (INT_MAX - total_margin_h) / tile->h) {
108  av_log(ctx, AV_LOG_ERROR, "Total height %ux%u is too much.\n",
109  tile->h, inlink->h);
110  return AVERROR(EINVAL);
111  }
112  outlink->w = tile->w * inlink->w + total_margin_w;
113  outlink->h = tile->h * inlink->h + total_margin_h;
114  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
115  outlink->frame_rate = av_mul_q(inlink->frame_rate,
116  av_make_q(1, tile->nb_frames));
117  ff_draw_init(&tile->draw, inlink->format, 0);
118  ff_draw_color(&tile->draw, &tile->blank, tile->rgba_color);
119 
120  outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
121 
122  return 0;
123 }
124 
125 static void get_current_tile_pos(AVFilterContext *ctx, unsigned *x, unsigned *y)
126 {
127  TileContext *tile = ctx->priv;
128  AVFilterLink *inlink = ctx->inputs[0];
129  const unsigned tx = tile->current % tile->w;
130  const unsigned ty = tile->current / tile->w;
131 
132  *x = tile->margin + (inlink->w + tile->padding) * tx;
133  *y = tile->margin + (inlink->h + tile->padding) * ty;
134 }
135 
136 static void draw_blank_frame(AVFilterContext *ctx, AVFrame *out_buf)
137 {
138  TileContext *tile = ctx->priv;
139  AVFilterLink *inlink = ctx->inputs[0];
140  unsigned x0, y0;
141 
142  get_current_tile_pos(ctx, &x0, &y0);
143  ff_fill_rectangle(&tile->draw, &tile->blank,
144  out_buf->data, out_buf->linesize,
145  x0, y0, inlink->w, inlink->h);
146  tile->current++;
147 }
149 {
150  TileContext *tile = ctx->priv;
151  AVFilterLink *outlink = ctx->outputs[0];
152  AVFrame *out_buf = tile->out_ref;
153  int ret;
154 
155  while (tile->current < tile->nb_frames)
156  draw_blank_frame(ctx, out_buf);
157  ret = ff_filter_frame(outlink, out_buf);
158  tile->current = 0;
159  return ret;
160 }
161 
162 /* Note: direct rendering is not possible since there is no guarantee that
163  * buffers are fed to filter_frame in the order they were obtained from
164  * get_buffer (think B-frames). */
165 
166 static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
167 {
168  AVFilterContext *ctx = inlink->dst;
169  TileContext *tile = ctx->priv;
170  AVFilterLink *outlink = ctx->outputs[0];
171  unsigned x0, y0;
172 
173  if (!tile->current) {
174  tile->out_ref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
175  if (!tile->out_ref) {
176  av_frame_free(&picref);
177  return AVERROR(ENOMEM);
178  }
179  av_frame_copy_props(tile->out_ref, picref);
180  tile->out_ref->width = outlink->w;
181  tile->out_ref->height = outlink->h;
182 
183  /* fill surface once for margin/padding */
184  if (tile->margin || tile->padding)
185  ff_fill_rectangle(&tile->draw, &tile->blank,
186  tile->out_ref->data,
187  tile->out_ref->linesize,
188  0, 0, outlink->w, outlink->h);
189  }
190 
191  get_current_tile_pos(ctx, &x0, &y0);
192  ff_copy_rectangle2(&tile->draw,
193  tile->out_ref->data, tile->out_ref->linesize,
194  picref->data, picref->linesize,
195  x0, y0, 0, 0, inlink->w, inlink->h);
196 
197  av_frame_free(&picref);
198  if (++tile->current == tile->nb_frames)
199  return end_last_frame(ctx);
200 
201  return 0;
202 }
203 
204 static int request_frame(AVFilterLink *outlink)
205 {
206  AVFilterContext *ctx = outlink->src;
207  TileContext *tile = ctx->priv;
208  AVFilterLink *inlink = ctx->inputs[0];
209  int r;
210 
211  r = ff_request_frame(inlink);
212  if (r == AVERROR_EOF && tile->current)
213  r = end_last_frame(ctx);
214  return r;
215 }
216 
217 static const AVFilterPad tile_inputs[] = {
218  {
219  .name = "default",
220  .type = AVMEDIA_TYPE_VIDEO,
221  .filter_frame = filter_frame,
222  },
223  { NULL }
224 };
225 
226 static const AVFilterPad tile_outputs[] = {
227  {
228  .name = "default",
229  .type = AVMEDIA_TYPE_VIDEO,
230  .config_props = config_props,
231  .request_frame = request_frame,
232  },
233  { NULL }
234 };
235 
237  .name = "tile",
238  .description = NULL_IF_CONFIG_SMALL("Tile several successive frames together."),
239  .init = init,
240  .query_formats = query_formats,
241  .priv_size = sizeof(TileContext),
242  .inputs = tile_inputs,
243  .outputs = tile_outputs,
244  .priv_class = &tile_class,
245 };