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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/pixdesc.h"
30 #include "libavutil/imgutils.h"
31 #include "avfilter.h"
32 
33 typedef struct {
34  int hsub, vsub;
35  int pixsteps[4];
36 
37  /* 0 Rotate by 90 degrees counterclockwise and vflip. */
38  /* 1 Rotate by 90 degrees clockwise. */
39  /* 2 Rotate by 90 degrees counterclockwise. */
40  /* 3 Rotate by 90 degrees clockwise and vflip. */
41  int dir;
42 } TransContext;
43 
44 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
45 {
46  TransContext *trans = ctx->priv;
47  trans->dir = 0;
48 
49  if (args)
50  sscanf(args, "%d", &trans->dir);
51 
52  if (trans->dir < 0 || trans->dir > 3) {
53  av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 3.\n",
54  trans->dir);
55  return AVERROR(EINVAL);
56  }
57  return 0;
58 }
59 
61 {
62  enum PixelFormat pix_fmts[] = {
84  };
85 
87  return 0;
88 }
89 
90 static int config_props_output(AVFilterLink *outlink)
91 {
92  AVFilterContext *ctx = outlink->src;
93  TransContext *trans = ctx->priv;
94  AVFilterLink *inlink = ctx->inputs[0];
95  const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
96 
99 
100  av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
101 
102  outlink->w = inlink->h;
103  outlink->h = inlink->w;
104 
105  if (inlink->sample_aspect_ratio.num){
106  outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
107  } else
108  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
109 
110  av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
111  inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
112  trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
113  trans->dir == 0 || trans->dir == 3);
114  return 0;
115 }
116 
117 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
118 {
119  AVFilterLink *outlink = inlink->dst->outputs[0];
120 
121  outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
122  outlink->w, outlink->h);
123  outlink->out_buf->pts = picref->pts;
124 
125  if (picref->video->pixel_aspect.num == 0) {
126  outlink->out_buf->video->pixel_aspect = picref->video->pixel_aspect;
127  } else {
128  outlink->out_buf->video->pixel_aspect.num = picref->video->pixel_aspect.den;
129  outlink->out_buf->video->pixel_aspect.den = picref->video->pixel_aspect.num;
130  }
131 
132  avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
133 }
134 
135 static void end_frame(AVFilterLink *inlink)
136 {
137  TransContext *trans = inlink->dst->priv;
138  AVFilterBufferRef *inpic = inlink->cur_buf;
139  AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
140  AVFilterLink *outlink = inlink->dst->outputs[0];
141  int plane;
142 
143  for (plane = 0; outpic->data[plane]; plane++) {
144  int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
145  int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
146  int pixstep = trans->pixsteps[plane];
147  int inh = inpic->video->h>>vsub;
148  int outw = outpic->video->w>>hsub;
149  int outh = outpic->video->h>>vsub;
150  uint8_t *out, *in;
151  int outlinesize, inlinesize;
152  int x, y;
153 
154  out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
155  in = inpic ->data[plane]; inlinesize = inpic ->linesize[plane];
156 
157  if (trans->dir&1) {
158  in += inpic->linesize[plane] * (inh-1);
159  inlinesize *= -1;
160  }
161 
162  if (trans->dir&2) {
163  out += outpic->linesize[plane] * (outh-1);
164  outlinesize *= -1;
165  }
166 
167  for (y = 0; y < outh; y++) {
168  switch (pixstep) {
169  case 1:
170  for (x = 0; x < outw; x++)
171  out[x] = in[x*inlinesize + y];
172  break;
173  case 2:
174  for (x = 0; x < outw; x++)
175  *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
176  break;
177  case 3:
178  for (x = 0; x < outw; x++) {
179  int32_t v = AV_RB24(in + x*inlinesize + y*3);
180  AV_WB24(out + 3*x, v);
181  }
182  break;
183  case 4:
184  for (x = 0; x < outw; x++)
185  *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
186  break;
187  }
188  out += outlinesize;
189  }
190  }
191 
192  avfilter_unref_buffer(inpic);
193  avfilter_draw_slice(outlink, 0, outpic->video->h, 1);
194  avfilter_end_frame(outlink);
195  avfilter_unref_buffer(outpic);
196 }
197 
199  .name = "transpose",
200  .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
201 
202  .init = init,
203  .priv_size = sizeof(TransContext),
204 
206 
207  .inputs = (AVFilterPad[]) {{ .name = "default",
208  .type = AVMEDIA_TYPE_VIDEO,
209  .start_frame = start_frame,
210  .end_frame = end_frame,
211  .min_perms = AV_PERM_READ, },
212  { .name = NULL}},
213  .outputs = (AVFilterPad[]) {{ .name = "default",
214  .config_props = config_props_output,
215  .type = AVMEDIA_TYPE_VIDEO, },
216  { .name = NULL}},
217 };