FFmpeg
vf_detelecine.c
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1 /*
2  * Copyright (c) 2015 Himangi Saraogi <himangi774@gmail.com>
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 /**
22  * @file detelecine filter.
23  */
24 
25 
26 #include "libavutil/avstring.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/pixdesc.h"
30 #include "avfilter.h"
31 #include "filters.h"
32 #include "formats.h"
33 #include "video.h"
34 
35 typedef struct DetelecineContext {
36  const AVClass *class;
38  char *pattern;
40  int init_len;
41  unsigned int pattern_pos;
42  unsigned int nskip_fields;
44 
47  int occupied;
48 
49  int nb_planes;
50  int planeheight[4];
51  int stride[4];
52 
56 
57 #define OFFSET(x) offsetof(DetelecineContext, x)
58 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
59 
60 static const AVOption detelecine_options[] = {
61  {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, .unit = "field"},
62  {"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "field"},
63  {"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "field"},
64  {"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "field"},
65  {"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "field"},
66  {"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS},
67  {"start_frame", "position of first frame with respect to the pattern if stream is cut", OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64=0}, 0, 13, FLAGS},
68  {NULL}
69 };
70 
71 AVFILTER_DEFINE_CLASS(detelecine);
72 
74 {
75  DetelecineContext *s = ctx->priv;
76  const char *p;
77  int max = 0;
78  int sum = 0;
79 
80  if (!strlen(s->pattern)) {
81  av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
82  return AVERROR_INVALIDDATA;
83  }
84 
85  for (p = s->pattern; *p; p++) {
86  if (!av_isdigit(*p)) {
87  av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n");
88  return AVERROR_INVALIDDATA;
89  }
90 
91  sum += *p - '0';
92  max = FFMAX(*p - '0', max);
93  s->pts.num += *p - '0';
94  s->pts.den += 2;
95  }
96 
97  if (s->start_frame >= sum) {
98  av_log(ctx, AV_LOG_ERROR, "Provided start_frame is too big.\n");
99  return AVERROR_INVALIDDATA;
100  }
101 
102  s->nskip_fields = 0;
103  s->pattern_pos = 0;
104  s->start_time = AV_NOPTS_VALUE;
105  s->init_len = 0;
106 
107  if (s->start_frame != 0) {
108  int nfields = 0;
109  for (p = s->pattern; *p; p++) {
110  nfields += *p - '0';
111  s->pattern_pos++;
112  if (nfields >= 2*s->start_frame) {
113  s->init_len = nfields - 2*s->start_frame;
114  break;
115  }
116  }
117  }
118 
119  av_log(ctx, AV_LOG_INFO, "Detelecine pattern %s removes up to %d frames per frame, pts advance factor: %d/%d\n",
120  s->pattern, (max + 1) / 2, s->pts.num, s->pts.den);
121 
122  return 0;
123 }
124 
126  AVFilterFormatsConfig **cfg_in,
127  AVFilterFormatsConfig **cfg_out)
128 {
129  int reject_flags = AV_PIX_FMT_FLAG_BITSTREAM |
132 
133  return ff_set_common_formats2(ctx, cfg_in, cfg_out,
134  ff_formats_pixdesc_filter(0, reject_flags));
135 }
136 
138 {
139  DetelecineContext *s = inlink->dst->priv;
141  int ret;
142 
143  s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
144  if (!s->temp)
145  return AVERROR(ENOMEM);
146 
147  s->frame[0] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
148  if (!s->frame[0])
149  return AVERROR(ENOMEM);
150 
151  s->frame[1] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
152  if (!s->frame[1])
153  return AVERROR(ENOMEM);
154 
155  if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
156  return ret;
157 
158  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
159  s->planeheight[0] = s->planeheight[3] = inlink->h;
160 
161  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
162 
163  return 0;
164 }
165 
166 static int config_output(AVFilterLink *outlink)
167 {
168  FilterLink *outl = ff_filter_link(outlink);
169  AVFilterContext *ctx = outlink->src;
170  DetelecineContext *s = ctx->priv;
171  const AVFilterLink *inlink = ctx->inputs[0];
172  const FilterLink *inl = ff_filter_link(ctx->inputs[0]);
173  AVRational fps = inl->frame_rate;
174 
175  if (!fps.num || !fps.den) {
176  av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
177  "current rate of %d/%d is invalid\n", fps.num, fps.den);
178  return AVERROR(EINVAL);
179  }
180  fps = av_mul_q(fps, av_inv_q(s->pts));
181  av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
182  inl->frame_rate.num, inl->frame_rate.den, fps.num, fps.den);
183 
184  outl->frame_rate = fps;
185  outlink->time_base = av_mul_q(inlink->time_base, s->pts);
186  av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
187  inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
188 
189  s->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base));
190 
191  return 0;
192 }
193 
194 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
195 {
196  AVFilterContext *ctx = inlink->dst;
197  AVFilterLink *outlink = ctx->outputs[0];
198  FilterLink *outl = ff_filter_link(outlink);
199  DetelecineContext *s = ctx->priv;
200  int i, len = 0, ret = 0, out = 0;
201 
202  if (s->start_time == AV_NOPTS_VALUE)
203  s->start_time = inpicref->pts;
204 
205  if (s->nskip_fields >= 2) {
206  s->nskip_fields -= 2;
207  av_frame_free(&inpicref);
208  return 0;
209  } else if (s->nskip_fields >= 1) {
210  for (i = 0; i < s->nb_planes; i++) {
211  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
212  inpicref->data[i], inpicref->linesize[i],
213  s->stride[i],
214  s->planeheight[i]);
215  }
216  s->occupied = 1;
217  s->nskip_fields--;
218  av_frame_free(&inpicref);
219  return 0;
220  }
221 
222  if (s->nskip_fields == 0) {
223  len = s->init_len;
224  s->init_len = 0;
225  while(!len && s->pattern[s->pattern_pos]) {
226  len = s->pattern[s->pattern_pos] - '0';
227  s->pattern_pos++;
228  }
229 
230  if (!s->pattern[s->pattern_pos])
231  s->pattern_pos = 0;
232 
233  if(!len) { // do not output any field as the entire pattern is zero
234  av_frame_free(&inpicref);
235  return 0;
236  }
237 
238  if (len == 1 && s->occupied) {
239  s->occupied = 0;
240  // output THIS image as-is
241  for (i = 0; i < s->nb_planes; i++)
242  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
243  s->temp->data[i], s->temp->linesize[i],
244  s->stride[i],
245  s->planeheight[i]);
246  len = 0;
247  while(!len && s->pattern[s->pattern_pos]) {
248  len = s->pattern[s->pattern_pos] - '0';
249  s->pattern_pos++;
250  }
251 
252  if (!s->pattern[s->pattern_pos])
253  s->pattern_pos = 0;
254 
255  s->occupied = 0;
256  ++out;
257  }
258 
259  if (s->occupied) {
260  for (i = 0; i < s->nb_planes; i++) {
261  // fill in the EARLIER field from the new pic
262  av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * s->first_field,
263  s->frame[out]->linesize[i] * 2,
264  inpicref->data[i] + inpicref->linesize[i] * s->first_field,
265  inpicref->linesize[i] * 2,
266  s->stride[i],
267  (s->planeheight[i] - s->first_field + 1) / 2);
268  // fill in the LATER field from the buffered pic
269  av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * !s->first_field,
270  s->frame[out]->linesize[i] * 2,
271  s->temp->data[i] + s->temp->linesize[i] * !s->first_field,
272  s->temp->linesize[i] * 2,
273  s->stride[i],
274  (s->planeheight[i] - !s->first_field + 1) / 2);
275  }
276 
277  s->occupied = 0;
278  if (len <= 2) {
279  for (i = 0; i < s->nb_planes; i++) {
280  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
281  inpicref->data[i], inpicref->linesize[i],
282  s->stride[i],
283  s->planeheight[i]);
284  }
285  s->occupied = 1;
286  }
287  ++out;
288  len = (len >= 3) ? len - 3 : 0;
289  } else {
290  if (len >= 2) {
291  // output THIS image as-is
292  for (i = 0; i < s->nb_planes; i++)
293  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
294  inpicref->data[i], inpicref->linesize[i],
295  s->stride[i],
296  s->planeheight[i]);
297  len -= 2;
298  ++out;
299  } else if (len == 1) {
300  // output THIS image as-is
301  for (i = 0; i < s->nb_planes; i++)
302  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
303  inpicref->data[i], inpicref->linesize[i],
304  s->stride[i],
305  s->planeheight[i]);
306 
307  for (i = 0; i < s->nb_planes; i++) {
308  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
309  inpicref->data[i], inpicref->linesize[i],
310  s->stride[i],
311  s->planeheight[i]);
312  }
313  s->occupied = 1;
314 
315  len--;
316  ++out;
317  }
318  }
319 
320  if (len == 1 && s->occupied)
321  {
322  len--;
323  s->occupied = 0;
324  }
325  }
326  s->nskip_fields = len;
327 
328  for (i = 0; i < out; ++i) {
329  AVFrame *frame = av_frame_clone(s->frame[i]);
330 
331  if (!frame) {
332  av_frame_free(&inpicref);
333  return AVERROR(ENOMEM);
334  }
335 
336  av_frame_copy_props(frame, inpicref);
337  frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
338  av_rescale(outl->frame_count_in, s->ts_unit.num,
339  s->ts_unit.den);
340  ret = ff_filter_frame(outlink, frame);
341  }
342 
343  av_frame_free(&inpicref);
344 
345  return ret;
346 }
347 
349 {
350  DetelecineContext *s = ctx->priv;
351 
352  av_frame_free(&s->temp);
353  av_frame_free(&s->frame[0]);
354  av_frame_free(&s->frame[1]);
355 }
356 
357 static const AVFilterPad detelecine_inputs[] = {
358  {
359  .name = "default",
360  .type = AVMEDIA_TYPE_VIDEO,
361  .filter_frame = filter_frame,
362  .config_props = config_input,
363  },
364 };
365 
366 static const AVFilterPad detelecine_outputs[] = {
367  {
368  .name = "default",
369  .type = AVMEDIA_TYPE_VIDEO,
370  .config_props = config_output,
371  },
372 };
373 
375  .name = "detelecine",
376  .description = NULL_IF_CONFIG_SMALL("Apply an inverse telecine pattern."),
377  .priv_size = sizeof(DetelecineContext),
378  .priv_class = &detelecine_class,
379  .init = init,
380  .uninit = uninit,
384 };
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:116
DetelecineContext::nb_planes
int nb_planes
Definition: vf_detelecine.c:49
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
DetelecineContext::stride
int stride[4]
Definition: vf_detelecine.c:51
out
FILE * out
Definition: movenc.c:55
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1062
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3025
ff_set_common_formats2
int ff_set_common_formats2(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out, AVFilterFormats *formats)
Definition: formats.c:1007
int64_t
long long int64_t
Definition: coverity.c:34
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:162
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: filters.h:262
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:389
pixdesc.h
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:501
detelecine_inputs
static const AVFilterPad detelecine_inputs[]
Definition: vf_detelecine.c:357
AVOption
AVOption.
Definition: opt.h:429
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
Definition: vf_detelecine.c:194
config_output
static int config_output(AVFilterLink *outlink)
Definition: vf_detelecine.c:166
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:225
max
#define max(a, b)
Definition: cuda_runtime.h:33
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:205
video.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:410
av_image_copy_plane
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
Definition: imgutils.c:374
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_detelecine.c:137
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3065
DetelecineContext::start_time
int64_t start_time
Definition: vf_detelecine.c:43
query_formats
static int query_formats(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
Definition: vf_detelecine.c:125
DetelecineContext::occupied
int occupied
Definition: vf_detelecine.c:47
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_detelecine.c:348
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: filters.h:38
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:209
av_cold
#define av_cold
Definition: attributes.h:90
DetelecineContext::temp
AVFrame * temp
Definition: vf_detelecine.c:54
DetelecineContext::planeheight
int planeheight[4]
Definition: vf_detelecine.c:50
DetelecineContext::first_field
int first_field
Definition: vf_detelecine.c:37
av_image_fill_linesizes
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
Fill plane linesizes for an image with pixel format pix_fmt and width width.
Definition: imgutils.c:89
s
#define s(width, name)
Definition: cbs_vp9.c:198
DetelecineContext::frame
AVFrame * frame[2]
Definition: vf_detelecine.c:53
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:60
DetelecineContext::pattern_pos
unsigned int pattern_pos
Definition: vf_detelecine.c:41
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:49
DetelecineContext
Definition: vf_detelecine.c:35
av_frame_clone
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:597
detelecine_options
static const AVOption detelecine_options[]
Definition: vf_detelecine.c:60
DetelecineContext::start_frame
int start_frame
Definition: vf_detelecine.c:39
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: filters.h:263
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
NULL
#define NULL
Definition: coverity.c:32
detelecine_outputs
static const AVFilterPad detelecine_outputs[]
Definition: vf_detelecine.c:366
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:713
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_detelecine.c:73
DetelecineContext::ts_unit
AVRational ts_unit
Definition: vf_detelecine.c:46
AVFilterFormatsConfig
Lists of formats / etc.
Definition: avfilter.h:111
ff_filter_link
static FilterLink * ff_filter_link(AVFilterLink *link)
Definition: filters.h:197
DetelecineContext::pattern
char * pattern
Definition: vf_detelecine.c:38
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AV_PIX_FMT_FLAG_BITSTREAM
#define AV_PIX_FMT_FLAG_BITSTREAM
All values of a component are bit-wise packed end to end.
Definition: pixdesc.h:124
av_isdigit
static av_const int av_isdigit(int c)
Locale-independent conversion of ASCII isdigit.
Definition: avstring.h:202
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(detelecine)
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:220
ff_formats_pixdesc_filter
AVFilterFormats * ff_formats_pixdesc_filter(unsigned want, unsigned rej)
Construct a formats list containing all pixel formats with certain properties.
Definition: formats.c:553
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
FILTER_QUERY_FUNC2
#define FILTER_QUERY_FUNC2(func)
Definition: filters.h:239
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
len
int len
Definition: vorbis_enc_data.h:426
AVFilterPad::name
const char * name
Pad name.
Definition: filters.h:44
av_rescale
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
AVFilter
Filter definition.
Definition: avfilter.h:201
FLAGS
#define FLAGS
Definition: vf_detelecine.c:58
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Underlying C type is int.
Definition: opt.h:259
avfilter.h
ff_vf_detelecine
const AVFilter ff_vf_detelecine
Definition: vf_detelecine.c:374
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
DetelecineContext::init_len
int init_len
Definition: vf_detelecine.c:40
AVFilterContext
An instance of a filter.
Definition: avfilter.h:457
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
DetelecineContext::pts
AVRational pts
Definition: vf_detelecine.c:45
DetelecineContext::nskip_fields
unsigned int nskip_fields
Definition: vf_detelecine.c:42
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:434
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
avstring.h
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Underlying C type is a uint8_t* that is either NULL or points to a C string allocated with the av_mal...
Definition: opt.h:276
first_field
static int first_field(const struct video_data *s)
Definition: v4l2.c:256
AV_PIX_FMT_FLAG_PAL
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
Definition: pixdesc.h:120
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Special option type for declaring named constants.
Definition: opt.h:299
OFFSET
#define OFFSET(x)
Definition: vf_detelecine.c:57