FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vf_transpose.c
Go to the documentation of this file.
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  AVFilterFormats *pix_fmts = NULL;
90  int fmt;
91 
92  for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
93  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
94  if (!(desc->flags & PIX_FMT_PAL ||
95  desc->flags & PIX_FMT_HWACCEL ||
96  desc->flags & PIX_FMT_BITSTREAM ||
97  desc->log2_chroma_w != desc->log2_chroma_h))
98  ff_add_format(&pix_fmts, fmt);
99  }
100 
101 
102  ff_set_common_formats(ctx, pix_fmts);
103  return 0;
104 }
105 
106 static int config_props_output(AVFilterLink *outlink)
107 {
108  AVFilterContext *ctx = outlink->src;
109  TransContext *trans = ctx->priv;
110  AVFilterLink *inlink = ctx->inputs[0];
111  const AVPixFmtDescriptor *desc_out = av_pix_fmt_desc_get(outlink->format);
112  const AVPixFmtDescriptor *desc_in = av_pix_fmt_desc_get(inlink->format);
113 
114  if (trans->dir&4) {
115  av_log(ctx, AV_LOG_WARNING,
116  "dir values greater than 3 are deprecated, use the passthrough option instead\n");
117  trans->dir &= 3;
119  }
120 
121  if ((inlink->w >= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_LANDSCAPE) ||
122  (inlink->w <= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_PORTRAIT)) {
123  av_log(ctx, AV_LOG_VERBOSE,
124  "w:%d h:%d -> w:%d h:%d (passthrough mode)\n",
125  inlink->w, inlink->h, inlink->w, inlink->h);
126  return 0;
127  } else {
129  }
130 
131  trans->hsub = desc_in->log2_chroma_w;
132  trans->vsub = desc_in->log2_chroma_h;
133 
134  av_image_fill_max_pixsteps(trans->pixsteps, NULL, desc_out);
135 
136  outlink->w = inlink->h;
137  outlink->h = inlink->w;
138 
139  if (inlink->sample_aspect_ratio.num){
140  outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
141  } else
142  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
143 
144  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
145  inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
146  trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
147  trans->dir == 0 || trans->dir == 3);
148  return 0;
149 }
150 
151 static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
152 {
153  TransContext *trans = inlink->dst->priv;
154 
155  return trans->passthrough ?
156  ff_null_get_video_buffer (inlink, perms, w, h) :
157  ff_default_get_video_buffer(inlink, perms, w, h);
158 }
159 
161 {
162  TransContext *trans = inlink->dst->priv;
163  AVFilterLink *outlink = inlink->dst->outputs[0];
165  int plane;
166 
167  if (trans->passthrough)
168  return ff_filter_frame(outlink, in);
169 
170  out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
171  if (!out) {
173  return AVERROR(ENOMEM);
174  }
175 
176  out->pts = in->pts;
177 
178  if (in->video->sample_aspect_ratio.num == 0) {
180  } else {
183  }
184 
185  for (plane = 0; out->data[plane]; plane++) {
186  int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
187  int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
188  int pixstep = trans->pixsteps[plane];
189  int inh = in->video->h>>vsub;
190  int outw = out->video->w>>hsub;
191  int outh = out->video->h>>vsub;
192  uint8_t *dst, *src;
193  int dstlinesize, srclinesize;
194  int x, y;
195 
196  dst = out->data[plane];
197  dstlinesize = out->linesize[plane];
198  src = in->data[plane];
199  srclinesize = in->linesize[plane];
200 
201  if (trans->dir&1) {
202  src += in->linesize[plane] * (inh-1);
203  srclinesize *= -1;
204  }
205 
206  if (trans->dir&2) {
207  dst += out->linesize[plane] * (outh-1);
208  dstlinesize *= -1;
209  }
210 
211  for (y = 0; y < outh; y++) {
212  switch (pixstep) {
213  case 1:
214  for (x = 0; x < outw; x++)
215  dst[x] = src[x*srclinesize + y];
216  break;
217  case 2:
218  for (x = 0; x < outw; x++)
219  *((uint16_t *)(dst + 2*x)) = *((uint16_t *)(src + x*srclinesize + y*2));
220  break;
221  case 3:
222  for (x = 0; x < outw; x++) {
223  int32_t v = AV_RB24(src + x*srclinesize + y*3);
224  AV_WB24(dst + 3*x, v);
225  }
226  break;
227  case 4:
228  for (x = 0; x < outw; x++)
229  *((uint32_t *)(dst + 4*x)) = *((uint32_t *)(src + x*srclinesize + y*4));
230  break;
231  case 6:
232  for (x = 0; x < outw; x++) {
233  int64_t v = AV_RB48(src + x*srclinesize + y*6);
234  AV_WB48(dst + 6*x, v);
235  }
236  break;
237  case 8:
238  for (x = 0; x < outw; x++)
239  *((uint64_t *)(dst + 8*x)) = *((uint64_t *)(src + x*srclinesize + y*8));
240  break;
241  }
242  dst += dstlinesize;
243  }
244  }
245 
247  return ff_filter_frame(outlink, out);
248 }
249 
251  {
252  .name = "default",
253  .type = AVMEDIA_TYPE_VIDEO,
254  .get_video_buffer= get_video_buffer,
255  .filter_frame = filter_frame,
256  .min_perms = AV_PERM_READ,
257  },
258  { NULL }
259 };
260 
262  {
263  .name = "default",
264  .config_props = config_props_output,
265  .type = AVMEDIA_TYPE_VIDEO,
266  },
267  { NULL }
268 };
269 
271  .name = "transpose",
272  .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
273 
274  .init = init,
275  .priv_size = sizeof(TransContext),
276 
278 
279  .inputs = avfilter_vf_transpose_inputs,
280  .outputs = avfilter_vf_transpose_outputs,
281  .priv_class = &transpose_class,
282 };