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vf_extractplanes.c
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1 /*
2  * Copyright (c) 2013 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/avstring.h"
22 #include "libavutil/imgutils.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
25 #include "avfilter.h"
26 #include "drawutils.h"
27 #include "internal.h"
28 
29 #define PLANE_R 0x01
30 #define PLANE_G 0x02
31 #define PLANE_B 0x04
32 #define PLANE_A 0x08
33 #define PLANE_Y 0x10
34 #define PLANE_U 0x20
35 #define PLANE_V 0x40
36 
37 typedef struct {
38  const AVClass *class;
40  int map[4];
41  int linesize[4];
43  int depth;
44  int step;
46 
47 #define OFFSET(x) offsetof(ExtractPlanesContext, x)
48 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
49 static const AVOption extractplanes_options[] = {
50  { "planes", "set planes", OFFSET(requested_planes), AV_OPT_TYPE_FLAGS, {.i64=1}, 1, 0xff, FLAGS, "flags"},
51  { "y", "set luma plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, "flags"},
52  { "u", "set u plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, "flags"},
53  { "v", "set v plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, "flags"},
54  { "r", "set red plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, "flags"},
55  { "g", "set green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, "flags"},
56  { "b", "set blue plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, "flags"},
57  { "a", "set alpha plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_A}, 0, 0, FLAGS, "flags"},
58  { NULL }
59 };
60 
61 AVFILTER_DEFINE_CLASS(extractplanes);
62 
64 {
65  static const enum AVPixelFormat in_pixfmts[] = {
93  };
94  static const enum AVPixelFormat out8_pixfmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
95  static const enum AVPixelFormat out16le_pixfmts[] = { AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_NONE };
96  static const enum AVPixelFormat out16be_pixfmts[] = { AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE };
97  const enum AVPixelFormat *out_pixfmts;
98  const AVPixFmtDescriptor *desc;
99  AVFilterFormats *avff;
100  int i, depth = 0, be = 0;
101 
102  if (!ctx->inputs[0]->in_formats ||
103  !ctx->inputs[0]->in_formats->nb_formats) {
104  return AVERROR(EAGAIN);
105  }
106 
107  if (!ctx->inputs[0]->out_formats)
108  ff_formats_ref(ff_make_format_list(in_pixfmts), &ctx->inputs[0]->out_formats);
109 
110  avff = ctx->inputs[0]->in_formats;
111  desc = av_pix_fmt_desc_get(avff->formats[0]);
112  depth = desc->comp[0].depth_minus1;
113  be = desc->flags & AV_PIX_FMT_FLAG_BE;
114  for (i = 1; i < avff->nb_formats; i++) {
115  desc = av_pix_fmt_desc_get(avff->formats[i]);
116  if (depth != desc->comp[0].depth_minus1 ||
117  be != (desc->flags & AV_PIX_FMT_FLAG_BE)) {
118  return AVERROR(EAGAIN);
119  }
120  }
121 
122  if (depth == 7)
123  out_pixfmts = out8_pixfmts;
124  else if (be)
125  out_pixfmts = out16be_pixfmts;
126  else
127  out_pixfmts = out16le_pixfmts;
128 
129  for (i = 0; i < ctx->nb_outputs; i++)
130  ff_formats_ref(ff_make_format_list(out_pixfmts), &ctx->outputs[i]->in_formats);
131  return 0;
132 }
133 
134 static int config_input(AVFilterLink *inlink)
135 {
136  AVFilterContext *ctx = inlink->dst;
137  ExtractPlanesContext *e = ctx->priv;
138  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
139  int plane_avail, ret, i;
140  uint8_t rgba_map[4];
141 
142  plane_avail = ((desc->flags & AV_PIX_FMT_FLAG_RGB) ? PLANE_R|PLANE_G|PLANE_B :
143  PLANE_Y |
144  ((desc->nb_components > 2) ? PLANE_U|PLANE_V : 0)) |
145  ((desc->flags & AV_PIX_FMT_FLAG_ALPHA) ? PLANE_A : 0);
146  if (e->requested_planes & ~plane_avail) {
147  av_log(ctx, AV_LOG_ERROR, "Requested planes not available.\n");
148  return AVERROR(EINVAL);
149  }
150  if ((ret = av_image_fill_linesizes(e->linesize, inlink->format, inlink->w)) < 0)
151  return ret;
152 
153  e->depth = (desc->comp[0].depth_minus1 + 1) >> 3;
154  e->step = av_get_padded_bits_per_pixel(desc) >> 3;
156  if (desc->flags & AV_PIX_FMT_FLAG_RGB) {
157  ff_fill_rgba_map(rgba_map, inlink->format);
158  for (i = 0; i < 4; i++)
159  e->map[i] = rgba_map[e->map[i]];
160  }
161 
162  return 0;
163 }
164 
165 static int config_output(AVFilterLink *outlink)
166 {
167  AVFilterContext *ctx = outlink->src;
168  AVFilterLink *inlink = ctx->inputs[0];
169  ExtractPlanesContext *e = ctx->priv;
170  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
171  const int output = outlink->srcpad - ctx->output_pads;
172 
173  if (e->map[output] == 1 || e->map[output] == 2) {
174  outlink->h = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
175  outlink->w = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
176  }
177 
178  return 0;
179 }
180 
181 static void extract_from_packed(uint8_t *dst, int dst_linesize,
182  const uint8_t *src, int src_linesize,
183  int width, int height,
184  int depth, int step, int comp)
185 {
186  int x, y;
187 
188  for (y = 0; y < height; y++) {
189  switch (depth) {
190  case 1:
191  for (x = 0; x < width; x++)
192  dst[x] = src[x * step + comp];
193  break;
194  case 2:
195  for (x = 0; x < width; x++) {
196  dst[x * 2 ] = src[x * step + comp * 2 ];
197  dst[x * 2 + 1] = src[x * step + comp * 2 + 1];
198  }
199  break;
200  }
201  dst += dst_linesize;
202  src += src_linesize;
203  }
204 }
205 
206 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
207 {
208  AVFilterContext *ctx = inlink->dst;
209  ExtractPlanesContext *e = ctx->priv;
210  int i, eof = 0, ret = 0;
211 
212  for (i = 0; i < ctx->nb_outputs; i++) {
213  AVFilterLink *outlink = ctx->outputs[i];
214  const int idx = e->map[i];
215  AVFrame *out;
216 
217  if (outlink->closed)
218  continue;
219 
220  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
221  if (!out) {
222  ret = AVERROR(ENOMEM);
223  break;
224  }
225  av_frame_copy_props(out, frame);
226 
227  if (e->is_packed_rgb) {
228  extract_from_packed(out->data[0], out->linesize[0],
229  frame->data[0], frame->linesize[0],
230  outlink->w, outlink->h,
231  e->depth,
232  e->step, idx);
233  } else {
234  av_image_copy_plane(out->data[0], out->linesize[0],
235  frame->data[idx], frame->linesize[idx],
236  e->linesize[idx], outlink->h);
237  }
238 
239  ret = ff_filter_frame(outlink, out);
240  if (ret == AVERROR_EOF)
241  eof++;
242  else if (ret < 0)
243  break;
244  }
245  av_frame_free(&frame);
246 
247  if (eof == ctx->nb_outputs)
248  ret = AVERROR_EOF;
249  else if (ret == AVERROR_EOF)
250  ret = 0;
251  return ret;
252 }
253 
254 static av_cold int init(AVFilterContext *ctx)
255 {
256  ExtractPlanesContext *e = ctx->priv;
257  int planes = (e->requested_planes & 0xf) | (e->requested_planes >> 4);
258  int i;
259 
260  for (i = 0; i < 4; i++) {
261  char *name;
262  AVFilterPad pad = { 0 };
263 
264  if (!(planes & (1 << i)))
265  continue;
266 
267  name = av_asprintf("out%d", ctx->nb_outputs);
268  if (!name)
269  return AVERROR(ENOMEM);
270  e->map[ctx->nb_outputs] = i;
271  pad.name = name;
272  pad.type = AVMEDIA_TYPE_VIDEO;
274 
275  ff_insert_outpad(ctx, ctx->nb_outputs, &pad);
276  }
277 
278  return 0;
279 }
280 
281 static av_cold void uninit(AVFilterContext *ctx)
282 {
283  int i;
284 
285  for (i = 0; i < ctx->nb_outputs; i++)
286  av_freep(&ctx->output_pads[i].name);
287 }
288 
290  {
291  .name = "default",
292  .type = AVMEDIA_TYPE_VIDEO,
293  .filter_frame = filter_frame,
294  .config_props = config_input,
295  },
296  { NULL }
297 };
298 
300  .name = "extractplanes",
301  .description = NULL_IF_CONFIG_SMALL("Extract planes as grayscale frames."),
302  .priv_size = sizeof(ExtractPlanesContext),
303  .priv_class = &extractplanes_class,
304  .init = init,
305  .uninit = uninit,
307  .inputs = extractplanes_inputs,
308  .outputs = NULL,
310 };
311 
312 #if CONFIG_ALPHAEXTRACT_FILTER
313 
314 static av_cold int init_alphaextract(AVFilterContext *ctx)
315 {
316  ExtractPlanesContext *e = ctx->priv;
317 
319 
320  return init(ctx);
321 }
322 
323 AVFilter avfilter_vf_alphaextract = {
324  .name = "alphaextract",
325  .description = NULL_IF_CONFIG_SMALL("Extract an alpha channel as a "
326  "grayscale image component."),
327  .priv_size = sizeof(ExtractPlanesContext),
328  .init = init_alphaextract,
329  .uninit = uninit,
331  .inputs = extractplanes_inputs,
332  .outputs = NULL,
334 };
335 #endif /* CONFIG_ALPHAEXTRACT_FILTER */