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 {
128  int ret;
129 
134  if (ret < 0)
135  return ret;
137 }
138 
140 {
141  DetelecineContext *s = inlink->dst->priv;
143  int ret;
144 
145  s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
146  if (!s->temp)
147  return AVERROR(ENOMEM);
148 
149  s->frame[0] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
150  if (!s->frame[0])
151  return AVERROR(ENOMEM);
152 
153  s->frame[1] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
154  if (!s->frame[1])
155  return AVERROR(ENOMEM);
156 
157  if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
158  return ret;
159 
160  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
161  s->planeheight[0] = s->planeheight[3] = inlink->h;
162 
163  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
164 
165  return 0;
166 }
167 
168 static int config_output(AVFilterLink *outlink)
169 {
170  AVFilterContext *ctx = outlink->src;
171  DetelecineContext *s = ctx->priv;
172  const AVFilterLink *inlink = ctx->inputs[0];
173  AVRational fps = inlink->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  inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
183 
184  outlink->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  DetelecineContext *s = ctx->priv;
199  int i, len = 0, ret = 0, out = 0;
200 
201  if (s->start_time == AV_NOPTS_VALUE)
202  s->start_time = inpicref->pts;
203 
204  if (s->nskip_fields >= 2) {
205  s->nskip_fields -= 2;
206  av_frame_free(&inpicref);
207  return 0;
208  } else if (s->nskip_fields >= 1) {
209  for (i = 0; i < s->nb_planes; i++) {
210  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
211  inpicref->data[i], inpicref->linesize[i],
212  s->stride[i],
213  s->planeheight[i]);
214  }
215  s->occupied = 1;
216  s->nskip_fields--;
217  av_frame_free(&inpicref);
218  return 0;
219  }
220 
221  if (s->nskip_fields == 0) {
222  len = s->init_len;
223  s->init_len = 0;
224  while(!len && s->pattern[s->pattern_pos]) {
225  len = s->pattern[s->pattern_pos] - '0';
226  s->pattern_pos++;
227  }
228 
229  if (!s->pattern[s->pattern_pos])
230  s->pattern_pos = 0;
231 
232  if(!len) { // do not output any field as the entire pattern is zero
233  av_frame_free(&inpicref);
234  return 0;
235  }
236 
237  if (len == 1 && s->occupied) {
238  s->occupied = 0;
239  // output THIS image as-is
240  for (i = 0; i < s->nb_planes; i++)
241  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
242  s->temp->data[i], s->temp->linesize[i],
243  s->stride[i],
244  s->planeheight[i]);
245  len = 0;
246  while(!len && s->pattern[s->pattern_pos]) {
247  len = s->pattern[s->pattern_pos] - '0';
248  s->pattern_pos++;
249  }
250 
251  if (!s->pattern[s->pattern_pos])
252  s->pattern_pos = 0;
253 
254  s->occupied = 0;
255  ++out;
256  }
257 
258  if (s->occupied) {
259  for (i = 0; i < s->nb_planes; i++) {
260  // fill in the EARLIER field from the new pic
261  av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * s->first_field,
262  s->frame[out]->linesize[i] * 2,
263  inpicref->data[i] + inpicref->linesize[i] * s->first_field,
264  inpicref->linesize[i] * 2,
265  s->stride[i],
266  (s->planeheight[i] - s->first_field + 1) / 2);
267  // fill in the LATER field from the buffered pic
268  av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * !s->first_field,
269  s->frame[out]->linesize[i] * 2,
270  s->temp->data[i] + s->temp->linesize[i] * !s->first_field,
271  s->temp->linesize[i] * 2,
272  s->stride[i],
273  (s->planeheight[i] - !s->first_field + 1) / 2);
274  }
275 
276  s->occupied = 0;
277  if (len <= 2) {
278  for (i = 0; i < s->nb_planes; i++) {
279  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
280  inpicref->data[i], inpicref->linesize[i],
281  s->stride[i],
282  s->planeheight[i]);
283  }
284  s->occupied = 1;
285  }
286  ++out;
287  len = (len >= 3) ? len - 3 : 0;
288  } else {
289  if (len >= 2) {
290  // output THIS image as-is
291  for (i = 0; i < s->nb_planes; i++)
292  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
293  inpicref->data[i], inpicref->linesize[i],
294  s->stride[i],
295  s->planeheight[i]);
296  len -= 2;
297  ++out;
298  } else if (len == 1) {
299  // output THIS image as-is
300  for (i = 0; i < s->nb_planes; i++)
301  av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
302  inpicref->data[i], inpicref->linesize[i],
303  s->stride[i],
304  s->planeheight[i]);
305 
306  for (i = 0; i < s->nb_planes; i++) {
307  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
308  inpicref->data[i], inpicref->linesize[i],
309  s->stride[i],
310  s->planeheight[i]);
311  }
312  s->occupied = 1;
313 
314  len--;
315  ++out;
316  }
317  }
318 
319  if (len == 1 && s->occupied)
320  {
321  len--;
322  s->occupied = 0;
323  }
324  }
325  s->nskip_fields = len;
326 
327  for (i = 0; i < out; ++i) {
328  AVFrame *frame = av_frame_clone(s->frame[i]);
329 
330  if (!frame) {
331  av_frame_free(&inpicref);
332  return AVERROR(ENOMEM);
333  }
334 
335  av_frame_copy_props(frame, inpicref);
336  frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
337  av_rescale(outlink->frame_count_in, s->ts_unit.num,
338  s->ts_unit.den);
339  ret = ff_filter_frame(outlink, frame);
340  }
341 
342  av_frame_free(&inpicref);
343 
344  return ret;
345 }
346 
348 {
349  DetelecineContext *s = ctx->priv;
350 
351  av_frame_free(&s->temp);
352  av_frame_free(&s->frame[0]);
353  av_frame_free(&s->frame[1]);
354 }
355 
356 static const AVFilterPad detelecine_inputs[] = {
357  {
358  .name = "default",
359  .type = AVMEDIA_TYPE_VIDEO,
360  .filter_frame = filter_frame,
361  .config_props = config_input,
362  },
363  { NULL }
364 };
365 
366 static const AVFilterPad detelecine_outputs[] = {
367  {
368  .name = "default",
369  .type = AVMEDIA_TYPE_VIDEO,
370  .config_props = config_output,
371  },
372  { NULL }
373 };
374 
376  .name = "detelecine",
377  .description = NULL_IF_CONFIG_SMALL("Apply an inverse telecine pattern."),
378  .priv_size = sizeof(DetelecineContext),
379  .priv_class = &detelecine_class,
380  .init = init,
381  .uninit = uninit,
385 };
formats
formats
Definition: signature.h:48
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:99
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:978
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2541
ff_formats_pixdesc_filter
int ff_formats_pixdesc_filter(AVFilterFormats **rfmts, unsigned want, unsigned rej)
Construct a formats list containing all pixel formats with certain properties.
Definition: formats.c:360
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:111
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:356
AVOption
AVOption.
Definition: opt.h:248
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:168
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:197
max
#define max(a, b)
Definition: cuda_runtime.h:33
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
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:371
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:65
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_detelecine.c:139
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2581
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:129
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_detelecine.c:347
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
inputs
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 inputs
Definition: filter_design.txt:243
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:580
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:58
DetelecineContext::pattern_pos
unsigned int pattern_pos
Definition: vf_detelecine.c:41
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
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:423
detelecine_options
static const AVOption detelecine_options[]
Definition: vf_detelecine.c:60
DetelecineContext::start_frame
int start_frame
Definition: vf_detelecine.c:39
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
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:536
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
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
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:125
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:192
internal.h
i
int i
Definition: input.c:407
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:452
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
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:145
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:225
avfilter.h
ff_vf_detelecine
const AVFilter ff_vf_detelecine
Definition: vf_detelecine.c:375
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:333
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:70
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, 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:59
avstring.h
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
first_field
static int first_field(const struct video_data *s)
Definition: v4l2.c:234
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:121
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
OFFSET
#define OFFSET(x)
Definition: vf_detelecine.c:57