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vf_transpose.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
3  * Copyright (c) 2008 Vitor Sessak
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * transposition filter
25  * Based on MPlayer libmpcodecs/vf_rotate.c.
26  */
27 
28 #include <stdio.h>
29 
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/pixdesc.h"
33 #include "libavutil/imgutils.h"
34 #include "libavutil/internal.h"
35 #include "avfilter.h"
36 #include "formats.h"
37 #include "internal.h"
38 #include "video.h"
39 
40 typedef enum {
45 
46 typedef struct {
47  const AVClass *class;
48  int hsub, vsub;
49  int pixsteps[4];
50 
51  /* 0 Rotate by 90 degrees counterclockwise and vflip. */
52  /* 1 Rotate by 90 degrees clockwise. */
53  /* 2 Rotate by 90 degrees counterclockwise. */
54  /* 3 Rotate by 90 degrees clockwise and vflip. */
55  int dir;
56  PassthroughType passthrough; ///< landscape passthrough mode enabled
57 } TransContext;
58 
59 #define OFFSET(x) offsetof(TransContext, x)
60 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
61 
62 static const AVOption transpose_options[] = {
63  { "dir", "set transpose direction", OFFSET(dir), AV_OPT_TYPE_INT, {.i64=0}, 0, 7, FLAGS },
64 
65  { "passthrough", "do not apply transposition if the input matches the specified geometry",
66  OFFSET(passthrough), AV_OPT_TYPE_INT, {.i64=TRANSPOSE_PT_TYPE_NONE}, 0, INT_MAX, FLAGS, "passthrough" },
67  { "none", "always apply transposition", 0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_NONE}, INT_MIN, INT_MAX, FLAGS, "passthrough" },
68  { "portrait", "preserve portrait geometry", 0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_PORTRAIT}, INT_MIN, INT_MAX, FLAGS, "passthrough" },
69  { "landscape", "preserve landscape geometry", 0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_LANDSCAPE}, INT_MIN, INT_MAX, FLAGS, "passthrough" },
70 
71  { NULL },
72 };
73 
74 AVFILTER_DEFINE_CLASS(transpose);
75 
76 static av_cold int init(AVFilterContext *ctx, const char *args)
77 {
78  TransContext *trans = ctx->priv;
79  const char *shorthand[] = { "dir", "passthrough", NULL };
80 
81  trans->class = &transpose_class;
82  av_opt_set_defaults(trans);
83 
84  return av_opt_set_from_string(trans, args, shorthand, "=", ":");
85 }
86 
88 {
89  static const enum AVPixelFormat pix_fmts[] = {
108  };
109 
111  return 0;
112 }
113 
114 static int config_props_output(AVFilterLink *outlink)
115 {
116  AVFilterContext *ctx = outlink->src;
117  TransContext *trans = ctx->priv;
118  AVFilterLink *inlink = ctx->inputs[0];
119  const AVPixFmtDescriptor *desc_out = av_pix_fmt_desc_get(outlink->format);
120  const AVPixFmtDescriptor *desc_in = av_pix_fmt_desc_get(inlink->format);
121 
122  if (trans->dir&4) {
123  av_log(ctx, AV_LOG_WARNING,
124  "dir values greater than 3 are deprecated, use the passthrough option instead\n");
125  trans->dir &= 3;
127  }
128 
129  if ((inlink->w >= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_LANDSCAPE) ||
130  (inlink->w <= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_PORTRAIT)) {
131  av_log(ctx, AV_LOG_VERBOSE,
132  "w:%d h:%d -> w:%d h:%d (passthrough mode)\n",
133  inlink->w, inlink->h, inlink->w, inlink->h);
134  return 0;
135  } else {
137  }
138 
139  trans->hsub = desc_in->log2_chroma_w;
140  trans->vsub = desc_in->log2_chroma_h;
141 
142  av_image_fill_max_pixsteps(trans->pixsteps, NULL, desc_out);
143 
144  outlink->w = inlink->h;
145  outlink->h = inlink->w;
146 
147  if (inlink->sample_aspect_ratio.num){
148  outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
149  } else
150  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
151 
152  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
153  inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
154  trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
155  trans->dir == 0 || trans->dir == 3);
156  return 0;
157 }
158 
159 static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
160 {
161  TransContext *trans = inlink->dst->priv;
162 
163  return trans->passthrough ?
164  ff_null_get_video_buffer (inlink, perms, w, h) :
165  ff_default_get_video_buffer(inlink, perms, w, h);
166 }
167 
169 {
170  TransContext *trans = inlink->dst->priv;
171  AVFilterLink *outlink = inlink->dst->outputs[0];
172  AVFilterBufferRef *out;
173  int plane;
174 
175  if (trans->passthrough)
176  return ff_filter_frame(outlink, in);
177 
178  out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
179  if (!out) {
181  return AVERROR(ENOMEM);
182  }
183 
184  out->pts = in->pts;
185 
186  if (in->video->sample_aspect_ratio.num == 0) {
188  } else {
191  }
192 
193  for (plane = 0; out->data[plane]; plane++) {
194  int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
195  int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
196  int pixstep = trans->pixsteps[plane];
197  int inh = in->video->h>>vsub;
198  int outw = out->video->w>>hsub;
199  int outh = out->video->h>>vsub;
200  uint8_t *dst, *src;
201  int dstlinesize, srclinesize;
202  int x, y;
203 
204  dst = out->data[plane];
205  dstlinesize = out->linesize[plane];
206  src = in->data[plane];
207  srclinesize = in->linesize[plane];
208 
209  if (trans->dir&1) {
210  src += in->linesize[plane] * (inh-1);
211  srclinesize *= -1;
212  }
213 
214  if (trans->dir&2) {
215  dst += out->linesize[plane] * (outh-1);
216  dstlinesize *= -1;
217  }
218 
219  for (y = 0; y < outh; y++) {
220  switch (pixstep) {
221  case 1:
222  for (x = 0; x < outw; x++)
223  dst[x] = src[x*srclinesize + y];
224  break;
225  case 2:
226  for (x = 0; x < outw; x++)
227  *((uint16_t *)(dst + 2*x)) = *((uint16_t *)(src + x*srclinesize + y*2));
228  break;
229  case 3:
230  for (x = 0; x < outw; x++) {
231  int32_t v = AV_RB24(src + x*srclinesize + y*3);
232  AV_WB24(dst + 3*x, v);
233  }
234  break;
235  case 4:
236  for (x = 0; x < outw; x++)
237  *((uint32_t *)(dst + 4*x)) = *((uint32_t *)(src + x*srclinesize + y*4));
238  break;
239  }
240  dst += dstlinesize;
241  }
242  }
243 
245  return ff_filter_frame(outlink, out);
246 }
247 
249  {
250  .name = "default",
251  .type = AVMEDIA_TYPE_VIDEO,
252  .get_video_buffer= get_video_buffer,
253  .filter_frame = filter_frame,
254  .min_perms = AV_PERM_READ,
255  },
256  { NULL }
257 };
258 
260  {
261  .name = "default",
262  .config_props = config_props_output,
263  .type = AVMEDIA_TYPE_VIDEO,
264  },
265  { NULL }
266 };
267 
269  .name = "transpose",
270  .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
271 
272  .init = init,
273  .priv_size = sizeof(TransContext),
274 
276 
277  .inputs = avfilter_vf_transpose_inputs,
278  .outputs = avfilter_vf_transpose_outputs,
279  .priv_class = &transpose_class,
280 };