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 "formats.h"
32 #include "internal.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;
43  int64_t start_time;
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, "field"},
62  {"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
63  {"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
64  {"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
65  {"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "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 {
127  int reject_flags = AV_PIX_FMT_FLAG_BITSTREAM |
130 
131  return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
132 }
133 
135 {
136  DetelecineContext *s = inlink->dst->priv;
138  int ret;
139 
140  s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
141  if (!s->temp)
142  return AVERROR(ENOMEM);
143 
144  s->frame[0] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
145  if (!s->frame[0])
146  return AVERROR(ENOMEM);
147 
148  s->frame[1] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
149  if (!s->frame[1])
150  return AVERROR(ENOMEM);
151 
152  if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
153  return ret;
154 
155  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
156  s->planeheight[0] = s->planeheight[3] = inlink->h;
157 
158  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
159 
160  return 0;
161 }
162 
163 static int config_output(AVFilterLink *outlink)
164 {
165  AVFilterContext *ctx = outlink->src;
166  DetelecineContext *s = ctx->priv;
167  const AVFilterLink *inlink = ctx->inputs[0];
168  AVRational fps = inlink->frame_rate;
169 
170  if (!fps.num || !fps.den) {
171  av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
172  "current rate of %d/%d is invalid\n", fps.num, fps.den);
173  return AVERROR(EINVAL);
174  }
175  fps = av_mul_q(fps, av_inv_q(s->pts));
176  av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
177  inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
178 
179  outlink->frame_rate = fps;
180  outlink->time_base = av_mul_q(inlink->time_base, s->pts);
181  av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
182  inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
183 
184  s->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base));
185 
186  return 0;
187 }
188 
189 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
190 {
191  AVFilterContext *ctx = inlink->dst;
192  AVFilterLink *outlink = ctx->outputs[0];
193  DetelecineContext *s = ctx->priv;
194  int i, len = 0, ret = 0, out = 0;
195 
196  if (s->start_time == AV_NOPTS_VALUE)
197  s->start_time = inpicref->pts;
198 
199  if (s->nskip_fields >= 2) {
200  s->nskip_fields -= 2;
201  av_frame_free(&inpicref);
202  return 0;
203  } else if (s->nskip_fields >= 1) {
204  for (i = 0; i < s->nb_planes; i++) {
205  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
206  inpicref->data[i], inpicref->linesize[i],
207  s->stride[i],
208  s->planeheight[i]);
209  }
210  s->occupied = 1;
211  s->nskip_fields--;
212  av_frame_free(&inpicref);
213  return 0;
214  }
215 
216  if (s->nskip_fields == 0) {
217  len = s->init_len;
218  s->init_len = 0;
219  while(!len && s->pattern[s->pattern_pos]) {
220  len = s->pattern[s->pattern_pos] - '0';
221  s->pattern_pos++;
222  }
223 
224  if (!s->pattern[s->pattern_pos])
225  s->pattern_pos = 0;
226 
227  if(!len) { // do not output any field as the entire pattern is zero
228  av_frame_free(&inpicref);
229  return 0;
230  }
231 
232  if (len == 1 && s->occupied) {
233  s->occupied = 0;
234  // output THIS image as-is
235  for (i = 0; i < s->nb_planes; i++)
236  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
237  s->temp->data[i], s->temp->linesize[i],
238  s->stride[i],
239  s->planeheight[i]);
240  len = 0;
241  while(!len && s->pattern[s->pattern_pos]) {
242  len = s->pattern[s->pattern_pos] - '0';
243  s->pattern_pos++;
244  }
245 
246  if (!s->pattern[s->pattern_pos])
247  s->pattern_pos = 0;
248 
249  s->occupied = 0;
250  ++out;
251  }
252 
253  if (s->occupied) {
254  for (i = 0; i < s->nb_planes; i++) {
255  // fill in the EARLIER field from the new pic
256  av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * s->first_field,
257  s->frame[out]->linesize[i] * 2,
258  inpicref->data[i] + inpicref->linesize[i] * s->first_field,
259  inpicref->linesize[i] * 2,
260  s->stride[i],
261  (s->planeheight[i] - s->first_field + 1) / 2);
262  // fill in the LATER field from the buffered pic
263  av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * !s->first_field,
264  s->frame[out]->linesize[i] * 2,
265  s->temp->data[i] + s->temp->linesize[i] * !s->first_field,
266  s->temp->linesize[i] * 2,
267  s->stride[i],
268  (s->planeheight[i] - !s->first_field + 1) / 2);
269  }
270 
271  s->occupied = 0;
272  if (len <= 2) {
273  for (i = 0; i < s->nb_planes; i++) {
274  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
275  inpicref->data[i], inpicref->linesize[i],
276  s->stride[i],
277  s->planeheight[i]);
278  }
279  s->occupied = 1;
280  }
281  ++out;
282  len = (len >= 3) ? len - 3 : 0;
283  } else {
284  if (len >= 2) {
285  // output THIS image as-is
286  for (i = 0; i < s->nb_planes; i++)
287  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
288  inpicref->data[i], inpicref->linesize[i],
289  s->stride[i],
290  s->planeheight[i]);
291  len -= 2;
292  ++out;
293  } else if (len == 1) {
294  // output THIS image as-is
295  for (i = 0; i < s->nb_planes; i++)
296  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
297  inpicref->data[i], inpicref->linesize[i],
298  s->stride[i],
299  s->planeheight[i]);
300 
301  for (i = 0; i < s->nb_planes; i++) {
302  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
303  inpicref->data[i], inpicref->linesize[i],
304  s->stride[i],
305  s->planeheight[i]);
306  }
307  s->occupied = 1;
308 
309  len--;
310  ++out;
311  }
312  }
313 
314  if (len == 1 && s->occupied)
315  {
316  len--;
317  s->occupied = 0;
318  }
319  }
320  s->nskip_fields = len;
321 
322  for (i = 0; i < out; ++i) {
323  AVFrame *frame = av_frame_clone(s->frame[i]);
324 
325  if (!frame) {
326  av_frame_free(&inpicref);
327  return AVERROR(ENOMEM);
328  }
329 
330  av_frame_copy_props(frame, inpicref);
331  frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
332  av_rescale(outlink->frame_count_in, s->ts_unit.num,
333  s->ts_unit.den);
334  ret = ff_filter_frame(outlink, frame);
335  }
336 
337  av_frame_free(&inpicref);
338 
339  return ret;
340 }
341 
343 {
344  DetelecineContext *s = ctx->priv;
345 
346  av_frame_free(&s->temp);
347  av_frame_free(&s->frame[0]);
348  av_frame_free(&s->frame[1]);
349 }
350 
351 static const AVFilterPad detelecine_inputs[] = {
352  {
353  .name = "default",
354  .type = AVMEDIA_TYPE_VIDEO,
355  .filter_frame = filter_frame,
356  .config_props = config_input,
357  },
358 };
359 
360 static const AVFilterPad detelecine_outputs[] = {
361  {
362  .name = "default",
363  .type = AVMEDIA_TYPE_VIDEO,
364  .config_props = config_output,
365  },
366 };
367 
369  .name = "detelecine",
370  .description = NULL_IF_CONFIG_SMALL("Apply an inverse telecine pattern."),
371  .priv_size = sizeof(DetelecineContext),
372  .priv_class = &detelecine_class,
373  .init = init,
374  .uninit = uninit,
378 };
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:98
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:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2564
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:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
pixdesc.h
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
detelecine_inputs
static const AVFilterPad detelecine_inputs[]
Definition: vf_detelecine.c:351
AVOption
AVOption.
Definition: opt.h:247
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
Definition: vf_detelecine.c:189
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:168
config_output
static int config_output(AVFilterLink *outlink)
Definition: vf_detelecine.c:163
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
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:153
video.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
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:134
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2604
DetelecineContext::start_time
int64_t start_time
Definition: vf_detelecine.c:43
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:342
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
DetelecineContext::temp
AVFrame * temp
Definition: vf_detelecine.c:54
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:699
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:257
DetelecineContext::frame
AVFrame * frame[2]
Definition: vf_detelecine.c:53
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:51
DetelecineContext::pattern_pos
unsigned int pattern_pos
Definition: vf_detelecine.c:41
ctx
AVFormatContext * ctx
Definition: movenc.c:48
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:424
detelecine_options
static const AVOption detelecine_options[]
Definition: vf_detelecine.c:60
DetelecineContext::start_frame
int start_frame
Definition: vf_detelecine.c:39
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
detelecine_outputs
static const AVFilterPad detelecine_outputs[]
Definition: vf_detelecine.c:360
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:537
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
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:117
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:211
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(detelecine)
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
internal.h
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:457
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
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: internal.h:56
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:128
AVFilter
Filter definition.
Definition: avfilter.h:149
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
Definition: opt.h:224
avfilter.h
ff_vf_detelecine
const AVFilter ff_vf_detelecine
Definition: vf_detelecine.c:368
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:386
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_detelecine.c:125
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
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:192
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
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
Definition: opt.h:228
first_field
static int first_field(const struct video_data *s)
Definition: v4l2.c:236
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
Definition: opt.h:233
OFFSET
#define OFFSET(x)
Definition: vf_detelecine.c:57