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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 } TileContext;
45 
46 #define REASONABLE_SIZE 1024
47 
48 #define OFFSET(x) offsetof(TileContext, x)
49 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
50 
51 static const AVOption tile_options[] = {
52  { "layout", "set grid size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE,
53  {.str = "6x5"}, 0, 0, FLAGS },
54  { "margin", "set outer border margin in pixels", OFFSET(margin),
55  AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
56  { "padding", "set inner border thickness in pixels", OFFSET(padding),
57  AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
58  { "nb_frames", "set maximum number of frame to render", OFFSET(nb_frames),
59  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
60  {NULL},
61 };
62 
64 
65 static av_cold int init(AVFilterContext *ctx, const char *args)
66 {
67  TileContext *tile = ctx->priv;
68  static const char *shorthand[] = { "layout", "nb_frames", "margin", "padding", NULL };
69  int ret;
70 
71  tile->class = &tile_class;
72  av_opt_set_defaults(tile);
73 
74  if ((ret = av_opt_set_from_string(tile, args, shorthand, "=", ":")) < 0)
75  return ret;
76 
77  if (tile->w > REASONABLE_SIZE || tile->h > REASONABLE_SIZE) {
78  av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",
79  tile->w, tile->h);
80  return AVERROR(EINVAL);
81  }
82 
83  if (tile->nb_frames == 0) {
84  tile->nb_frames = tile->w * tile->h;
85  } else if (tile->nb_frames > tile->w * tile->h) {
86  av_log(ctx, AV_LOG_ERROR, "nb_frames must be less than or equal to %dx%d=%d\n",
87  tile->w, tile->h, tile->w * tile->h);
88  return AVERROR(EINVAL);
89  }
90 
91  return 0;
92 }
93 
95 {
97  return 0;
98 }
99 
100 static int config_props(AVFilterLink *outlink)
101 {
102  AVFilterContext *ctx = outlink->src;
103  TileContext *tile = ctx->priv;
104  AVFilterLink *inlink = ctx->inputs[0];
105  const unsigned total_margin_w = (tile->w - 1) * tile->padding + 2*tile->margin;
106  const unsigned total_margin_h = (tile->h - 1) * tile->padding + 2*tile->margin;
107 
108  if (inlink->w > (INT_MAX - total_margin_w) / tile->w) {
109  av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",
110  tile->w, inlink->w);
111  return AVERROR(EINVAL);
112  }
113  if (inlink->h > (INT_MAX - total_margin_h) / tile->h) {
114  av_log(ctx, AV_LOG_ERROR, "Total height %ux%u is too much.\n",
115  tile->h, inlink->h);
116  return AVERROR(EINVAL);
117  }
118  outlink->w = tile->w * inlink->w + total_margin_w;
119  outlink->h = tile->h * inlink->h + total_margin_h;
120  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
121  outlink->frame_rate = av_mul_q(inlink->frame_rate,
122  (AVRational){ 1, tile->nb_frames });
123  ff_draw_init(&tile->draw, inlink->format, 0);
124  /* TODO make the color an option, or find an unified way of choosing it */
125  ff_draw_color(&tile->draw, &tile->blank, (uint8_t[]){ 0, 0, 0, -1 });
126 
127  return 0;
128 }
129 
130 static void get_current_tile_pos(AVFilterContext *ctx, unsigned *x, unsigned *y)
131 {
132  TileContext *tile = ctx->priv;
133  AVFilterLink *inlink = ctx->inputs[0];
134  const unsigned tx = tile->current % tile->w;
135  const unsigned ty = tile->current / tile->w;
136 
137  *x = tile->margin + (inlink->w + tile->padding) * tx;
138  *y = tile->margin + (inlink->h + tile->padding) * ty;
139 }
140 
142 {
143  TileContext *tile = ctx->priv;
144  AVFilterLink *inlink = ctx->inputs[0];
145  unsigned x0, y0;
146 
147  get_current_tile_pos(ctx, &x0, &y0);
148  ff_fill_rectangle(&tile->draw, &tile->blank,
149  out_buf->data, out_buf->linesize,
150  x0, y0, inlink->w, inlink->h);
151  tile->current++;
152 }
154 {
155  TileContext *tile = ctx->priv;
156  AVFilterLink *outlink = ctx->outputs[0];
157  AVFilterBufferRef *out_buf = tile->out_ref;
158  int ret;
159 
160  while (tile->current < tile->nb_frames)
161  draw_blank_frame(ctx, out_buf);
162  ret = ff_filter_frame(outlink, out_buf);
163  tile->current = 0;
164  return ret;
165 }
166 
167 /* Note: direct rendering is not possible since there is no guarantee that
168  * buffers are fed to filter_frame in the order they were obtained from
169  * get_buffer (think B-frames). */
170 
171 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
172 {
173  AVFilterContext *ctx = inlink->dst;
174  TileContext *tile = ctx->priv;
175  AVFilterLink *outlink = ctx->outputs[0];
176  unsigned x0, y0;
177 
178  if (!tile->current) {
179  tile->out_ref = ff_get_video_buffer(outlink, AV_PERM_WRITE,
180  outlink->w, outlink->h);
181  if (!tile->out_ref)
182  return AVERROR(ENOMEM);
184  tile->out_ref->video->w = outlink->w;
185  tile->out_ref->video->h = outlink->h;
186 
187  /* fill surface once for margin/padding */
188  if (tile->margin || tile->padding)
189  ff_fill_rectangle(&tile->draw, &tile->blank,
190  tile->out_ref->data,
191  tile->out_ref->linesize,
192  0, 0, outlink->w, outlink->h);
193  }
194 
195  get_current_tile_pos(ctx, &x0, &y0);
196  ff_copy_rectangle2(&tile->draw,
197  tile->out_ref->data, tile->out_ref->linesize,
198  picref->data, picref->linesize,
199  x0, y0, 0, 0, inlink->w, inlink->h);
200 
201  avfilter_unref_bufferp(&picref);
202  if (++tile->current == tile->nb_frames)
203  return end_last_frame(ctx);
204 
205  return 0;
206 }
207 
208 static int request_frame(AVFilterLink *outlink)
209 {
210  AVFilterContext *ctx = outlink->src;
211  TileContext *tile = ctx->priv;
212  AVFilterLink *inlink = ctx->inputs[0];
213  int r;
214 
215  while (1) {
216  r = ff_request_frame(inlink);
217  if (r < 0) {
218  if (r == AVERROR_EOF && tile->current)
219  r = end_last_frame(ctx);
220  break;
221  }
222  if (!tile->current) /* done */
223  break;
224  }
225  return r;
226 }
227 
228 static const AVFilterPad tile_inputs[] = {
229  {
230  .name = "default",
231  .type = AVMEDIA_TYPE_VIDEO,
232  .filter_frame = filter_frame,
233  .min_perms = AV_PERM_READ,
234  },
235  { NULL }
236 };
237 
238 static const AVFilterPad tile_outputs[] = {
239  {
240  .name = "default",
241  .type = AVMEDIA_TYPE_VIDEO,
242  .config_props = config_props,
243  .request_frame = request_frame,
244  },
245  { NULL }
246 };
247 
249  .name = "tile",
250  .description = NULL_IF_CONFIG_SMALL("Tile several successive frames together."),
251  .init = init,
252  .query_formats = query_formats,
253  .priv_size = sizeof(TileContext),
254  .inputs = tile_inputs,
255  .outputs = tile_outputs,
256  .priv_class = &tile_class,
257 };