FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vf_vidstabdetect.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2013 Georg Martius <georg dot martius at web dot de>
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 #define DEFAULT_RESULT_NAME "transforms.trf"
22 
23 #include <vid.stab/libvidstab.h>
24 
25 #include "libavutil/common.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/imgutils.h"
28 #include "avfilter.h"
29 #include "internal.h"
30 
31 #include "vidstabutils.h"
32 
33 typedef struct {
34  const AVClass *class;
35 
36  VSMotionDetect md;
37  VSMotionDetectConfig conf;
38 
39  char *result;
40  FILE *f;
41 } StabData;
42 
43 
44 #define OFFSET(x) offsetof(StabData, x)
45 #define OFFSETC(x) (offsetof(StabData, conf)+offsetof(VSMotionDetectConfig, x))
46 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
47 
48 static const AVOption vidstabdetect_options[] = {
49  {"result", "path to the file used to write the transforms", OFFSET(result), AV_OPT_TYPE_STRING, {.str = DEFAULT_RESULT_NAME}, .flags = FLAGS},
50  {"shakiness", "how shaky is the video and how quick is the camera?"
51  " 1: little (fast) 10: very strong/quick (slow)", OFFSETC(shakiness), AV_OPT_TYPE_INT, {.i64 = 5}, 1, 10, FLAGS},
52  {"accuracy", "(>=shakiness) 1: low 15: high (slow)", OFFSETC(accuracy), AV_OPT_TYPE_INT, {.i64 = 9}, 1, 15, FLAGS},
53  {"stepsize", "region around minimum is scanned with 1 pixel resolution", OFFSETC(stepSize), AV_OPT_TYPE_INT, {.i64 = 6}, 1, 32, FLAGS},
54  {"mincontrast", "below this contrast a field is discarded (0-1)", OFFSETC(contrastThreshold), AV_OPT_TYPE_DOUBLE, {.dbl = 0.25}, 0.0, 1.0, FLAGS},
55  {"show", "0: draw nothing; 1,2: show fields and transforms", OFFSETC(show), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 2, FLAGS},
56  {"tripod", "virtual tripod mode (if >0): motion is compared to a reference"
57  " reference frame (frame # is the value)", OFFSETC(virtualTripod), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS},
58  {NULL}
59 };
60 
61 AVFILTER_DEFINE_CLASS(vidstabdetect);
62 
63 static av_cold int init(AVFilterContext *ctx)
64 {
65  StabData *sd = ctx->priv;
67  sd->class = &vidstabdetect_class;
68  av_log(ctx, AV_LOG_VERBOSE, "vidstabdetect filter: init %s\n", LIBVIDSTAB_VERSION);
69  return 0;
70 }
71 
72 static av_cold void uninit(AVFilterContext *ctx)
73 {
74  StabData *sd = ctx->priv;
75  VSMotionDetect *md = &(sd->md);
76 
77  if (sd->f) {
78  fclose(sd->f);
79  sd->f = NULL;
80  }
81 
82  vsMotionDetectionCleanup(md);
83 }
84 
86 {
87  // If you add something here also add it in vidstabutils.c
88  static const enum AVPixelFormat pix_fmts[] = {
94  };
95 
97  return 0;
98 }
99 
100 static int config_input(AVFilterLink *inlink)
101 {
102  AVFilterContext *ctx = inlink->dst;
103  StabData *sd = ctx->priv;
104 
105  VSMotionDetect* md = &(sd->md);
106  VSFrameInfo fi;
107  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
108 
109  vsFrameInfoInit(&fi, inlink->w, inlink->h, av_2_vs_pixel_format(ctx, inlink->format));
110  if (fi.bytesPerPixel != av_get_bits_per_pixel(desc)/8) {
111  av_log(ctx, AV_LOG_ERROR, "pixel-format error: wrong bits/per/pixel, please report a BUG");
112  return AVERROR(EINVAL);
113  }
114  if (fi.log2ChromaW != desc->log2_chroma_w) {
115  av_log(ctx, AV_LOG_ERROR, "pixel-format error: log2_chroma_w, please report a BUG");
116  return AVERROR(EINVAL);
117  }
118 
119  if (fi.log2ChromaH != desc->log2_chroma_h) {
120  av_log(ctx, AV_LOG_ERROR, "pixel-format error: log2_chroma_h, please report a BUG");
121  return AVERROR(EINVAL);
122  }
123 
124  // set values that are not initialized by the options
125  sd->conf.algo = 1;
126  sd->conf.modName = "vidstabdetect";
127  if (vsMotionDetectInit(md, &sd->conf, &fi) != VS_OK) {
128  av_log(ctx, AV_LOG_ERROR, "initialization of Motion Detection failed, please report a BUG");
129  return AVERROR(EINVAL);
130  }
131 
132  vsMotionDetectGetConfig(&sd->conf, md);
133  av_log(ctx, AV_LOG_INFO, "Video stabilization settings (pass 1/2):\n");
134  av_log(ctx, AV_LOG_INFO, " shakiness = %d\n", sd->conf.shakiness);
135  av_log(ctx, AV_LOG_INFO, " accuracy = %d\n", sd->conf.accuracy);
136  av_log(ctx, AV_LOG_INFO, " stepsize = %d\n", sd->conf.stepSize);
137  av_log(ctx, AV_LOG_INFO, " mincontrast = %f\n", sd->conf.contrastThreshold);
138  av_log(ctx, AV_LOG_INFO, " show = %d\n", sd->conf.show);
139  av_log(ctx, AV_LOG_INFO, " result = %s\n", sd->result);
140 
141  sd->f = fopen(sd->result, "w");
142  if (sd->f == NULL) {
143  av_log(ctx, AV_LOG_ERROR, "cannot open transform file %s\n", sd->result);
144  return AVERROR(EINVAL);
145  } else {
146  if (vsPrepareFile(md, sd->f) != VS_OK) {
147  av_log(ctx, AV_LOG_ERROR, "cannot write to transform file %s\n", sd->result);
148  return AVERROR(EINVAL);
149  }
150  }
151  return 0;
152 }
153 
154 
155 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
156 {
157  AVFilterContext *ctx = inlink->dst;
158  StabData *sd = ctx->priv;
159  VSMotionDetect *md = &(sd->md);
160  LocalMotions localmotions;
161 
162  AVFilterLink *outlink = inlink->dst->outputs[0];
163  VSFrame frame;
164  int plane;
165 
166  if (sd->conf.show > 0 && !av_frame_is_writable(in))
168 
169  for (plane = 0; plane < md->fi.planes; plane++) {
170  frame.data[plane] = in->data[plane];
171  frame.linesize[plane] = in->linesize[plane];
172  }
173  if (vsMotionDetection(md, &localmotions, &frame) != VS_OK) {
174  av_log(ctx, AV_LOG_ERROR, "motion detection failed");
175  return AVERROR(AVERROR_EXTERNAL);
176  } else {
177  if (vsWriteToFile(md, sd->f, &localmotions) != VS_OK) {
178  av_log(ctx, AV_LOG_ERROR, "cannot write to transform file");
179  return AVERROR(errno);
180  }
181  vs_vector_del(&localmotions);
182  }
183 
184  return ff_filter_frame(outlink, in);
185 }
186 
188  {
189  .name = "default",
190  .type = AVMEDIA_TYPE_VIDEO,
191  .filter_frame = filter_frame,
192  .config_props = config_input,
193  },
194  { NULL }
195 };
196 
198  {
199  .name = "default",
200  .type = AVMEDIA_TYPE_VIDEO,
201  },
202  { NULL }
203 };
204 
206  .name = "vidstabdetect",
207  .description = NULL_IF_CONFIG_SMALL("Extract relative transformations, "
208  "pass 1 of 2 for stabilization "
209  "(see vidstabtransform for pass 2)."),
210  .priv_size = sizeof(StabData),
211  .init = init,
212  .uninit = uninit,
214  .inputs = avfilter_vf_vidstabdetect_inputs,
215  .outputs = avfilter_vf_vidstabdetect_outputs,
216  .priv_class = &vidstabdetect_class,
217 };