FFmpeg: libavfilter/vf_tile.c Source File

FFmpeg
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;
41   FFDrawContext draw;
42   FFDrawColor blank;
43   AVFrame *out_ref;
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  { "nb_frames", "set maximum number of frame to render", OFFSET(nb_frames),
55  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
56  { "margin", "set outer border margin in pixels", OFFSET(margin),
57  AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
58  { "padding", "set inner border thickness in pixels", OFFSET(padding),
59  AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
60  {NULL},
61 };
62 
63 AVFILTER_DEFINE_CLASS(tile);
64 
65  static av_cold int init(AVFilterContext *ctx)
66 {
67  TileContext *tile = ctx->priv;
68 
69  if (tile->w > REASONABLE_SIZE || tile->h > REASONABLE_SIZE) {
70  av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",
71  tile->w, tile->h);
72  return AVERROR(EINVAL);
73  }
74 
75  if (tile->nb_frames == 0) {
76  tile->nb_frames = tile->w * tile->h;
77  } else if (tile->nb_frames > tile->w * tile->h) {
78  av_log(ctx, AV_LOG_ERROR, "nb_frames must be less than or equal to %dx%d=%d\n",
79  tile->w, tile->h, tile->w * tile->h);
80  return AVERROR(EINVAL);
81  }
82 
83  return 0;
84 }
85 
86  static int query_formats(AVFilterContext *ctx)
87 {
88  ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
89  return 0;
90 }
91 
92  static int config_props(AVFilterLink *outlink)
93 {
94  AVFilterContext *ctx = outlink->src;
95  TileContext *tile = ctx->priv;
96  AVFilterLink *inlink = ctx->inputs[0];
97  const unsigned total_margin_w = (tile->w - 1) * tile->padding + 2*tile->margin;
98  const unsigned total_margin_h = (tile->h - 1) * tile->padding + 2*tile->margin;
99 
100  if (inlink->w > (INT_MAX - total_margin_w) / tile->w) {
101  av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",
102  tile->w, inlink->w);
103  return AVERROR(EINVAL);
104  }
105  if (inlink->h > (INT_MAX - total_margin_h) / tile->h) {
106  av_log(ctx, AV_LOG_ERROR, "Total height %ux%u is too much.\n",
107  tile->h, inlink->h);
108  return AVERROR(EINVAL);
109  }
110  outlink->w = tile->w * inlink->w + total_margin_w;
111  outlink->h = tile->h * inlink->h + total_margin_h;
112  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
113  outlink->frame_rate = av_mul_q(inlink->frame_rate,
114  (AVRational){ 1, tile->nb_frames });
115  ff_draw_init(&tile->draw, inlink->format, 0);
116  /* TODO make the color an option, or find an unified way of choosing it */
117  ff_draw_color(&tile->draw, &tile->blank, (uint8_t[]){ 0, 0, 0, -1 });
118 
119  outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
120 
121  return 0;
122 }
123 
124  static void get_current_tile_pos(AVFilterContext *ctx, unsigned *x, unsigned *y)
125 {
126  TileContext *tile = ctx->priv;
127  AVFilterLink *inlink = ctx->inputs[0];
128  const unsigned tx = tile->current % tile->w;
129  const unsigned ty = tile->current / tile->w;
130 
131  *x = tile->margin + (inlink->w + tile->padding) * tx;
132  *y = tile->margin + (inlink->h + tile->padding) * ty;
133 }
134 
135  static void draw_blank_frame(AVFilterContext *ctx, AVFrame *out_buf)
136 {
137  TileContext *tile = ctx->priv;
138  AVFilterLink *inlink = ctx->inputs[0];
139  unsigned x0, y0;
140 
141  get_current_tile_pos(ctx, &x0, &y0);
142  ff_fill_rectangle(&tile->draw, &tile->blank,
143  out_buf->data, out_buf->linesize,
144  x0, y0, inlink->w, inlink->h);
145  tile->current++;
146 }
147  static int end_last_frame(AVFilterContext *ctx)
148 {
149  TileContext *tile = ctx->priv;
150  AVFilterLink *outlink = ctx->outputs[0];
151  AVFrame *out_buf = tile->out_ref;
152  int ret;
153 
154  while (tile->current < tile->nb_frames)
155  draw_blank_frame(ctx, out_buf);
156  ret = ff_filter_frame(outlink, out_buf);
157  tile->current = 0;
158  return ret;
159 }
160 
161 /* Note: direct rendering is not possible since there is no guarantee that
162  * buffers are fed to filter_frame in the order they were obtained from
163  * get_buffer (think B-frames). */
164 
165  static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
166 {
167  AVFilterContext *ctx = inlink->dst;
168  TileContext *tile = ctx->priv;
169  AVFilterLink *outlink = ctx->outputs[0];
170  unsigned x0, y0;
171 
172  if (!tile->current) {
173  tile->out_ref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
174  if (!tile->out_ref)
175  return AVERROR(ENOMEM);
176  av_frame_copy_props(tile->out_ref, picref);
177  tile->out_ref->width = outlink->w;
178  tile->out_ref->height = outlink->h;
179 
180  /* fill surface once for margin/padding */
181  if (tile->margin || tile->padding)
182  ff_fill_rectangle(&tile->draw, &tile->blank,
183  tile->out_ref->data,
184  tile->out_ref->linesize,
185  0, 0, outlink->w, outlink->h);
186  }
187 
188  get_current_tile_pos(ctx, &x0, &y0);
189  ff_copy_rectangle2(&tile->draw,
190  tile->out_ref->data, tile->out_ref->linesize,
191  picref->data, picref->linesize,
192  x0, y0, 0, 0, inlink->w, inlink->h);
193 
194  av_frame_free(&picref);
195  if (++tile->current == tile->nb_frames)
196  return end_last_frame(ctx);
197 
198  return 0;
199 }
200 
201  static int request_frame(AVFilterLink *outlink)
202 {
203  AVFilterContext *ctx = outlink->src;
204  TileContext *tile = ctx->priv;
205  AVFilterLink *inlink = ctx->inputs[0];
206  int r;
207 
208  r = ff_request_frame(inlink);
209  if (r == AVERROR_EOF && tile->current)
210  r = end_last_frame(ctx);
211  return r;
212 }
213 
214  static const AVFilterPad tile_inputs[] = {
215  {
216  .name = "default",
217  .type = AVMEDIA_TYPE_VIDEO,
218  .filter_frame = filter_frame,
219  },
220  { NULL }
221 };
222 
223  static const AVFilterPad tile_outputs[] = {
224  {
225  .name = "default",
226  .type = AVMEDIA_TYPE_VIDEO,
227  .config_props = config_props,
228  .request_frame = request_frame,
229  },
230  { NULL }
231 };
232 
233  AVFilter avfilter_vf_tile = {
234  .name = "tile",
235  .description = NULL_IF_CONFIG_SMALL("Tile several successive frames together."),
236  .init = init,
237  .query_formats = query_formats,
238  .priv_size = sizeof(TileContext),
239  .inputs = tile_inputs,
240  .outputs = tile_outputs,
241  .priv_class = &tile_class,
242 };
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