FFmpeg
f_metadata.c
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1 /*
2  * Copyright (c) 2016 Paul B Mahol
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
23  * filter for manipulating frame metadata
24  */
25 
26 #include "config_components.h"
27 
28 #include <float.h>
29 
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/eval.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/timestamp.h"
36 #include "libavformat/avio.h"
37 #include "avfilter.h"
38 #include "audio.h"
39 #include "internal.h"
40 #include "video.h"
41 
49 };
50 
60 };
61 
62 static const char *const var_names[] = {
63  "VALUE1",
64  "VALUE2",
65  "FRAMEVAL",
66  "USERVAL",
67  NULL
68 };
69 
70 enum var_name {
76 };
77 
78 typedef struct MetadataContext {
79  const AVClass *class;
80 
81  int mode;
82  char *key;
83  char *value;
84  int function;
85 
86  char *expr_str;
89 
91  char *file_str;
92 
94  const char *value1, const char *value2);
95  void (*print)(AVFilterContext *ctx, const char *msg, ...) av_printf_format(2, 3);
96 
97  int direct; // reduces buffering when printing to user-supplied URL
99 
100 #define OFFSET(x) offsetof(MetadataContext, x)
101 #define DEFINE_OPTIONS(filt_name, FLAGS) \
102 static const AVOption filt_name##_options[] = { \
103  { "mode", "set a mode of operation", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATA_NB-1, FLAGS, .unit = "mode" }, \
104  { "select", "select frame", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_SELECT }, 0, 0, FLAGS, .unit = "mode" }, \
105  { "add", "add new metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_ADD }, 0, 0, FLAGS, .unit = "mode" }, \
106  { "modify", "modify metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_MODIFY }, 0, 0, FLAGS, .unit = "mode" }, \
107  { "delete", "delete metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_DELETE }, 0, 0, FLAGS, .unit = "mode" }, \
108  { "print", "print metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_PRINT }, 0, 0, FLAGS, .unit = "mode" }, \
109  { "key", "set metadata key", OFFSET(key), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
110  { "value", "set metadata value", OFFSET(value), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
111  { "function", "function for comparing values", OFFSET(function), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATAF_NB-1, FLAGS, .unit = "function" }, \
112  { "same_str", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_SAME_STR }, 0, 3, FLAGS, .unit = "function" }, \
113  { "starts_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_STARTS_WITH }, 0, 0, FLAGS, .unit = "function" }, \
114  { "less", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_LESS }, 0, 3, FLAGS, .unit = "function" }, \
115  { "equal", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EQUAL }, 0, 3, FLAGS, .unit = "function" }, \
116  { "greater", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_GREATER }, 0, 3, FLAGS, .unit = "function" }, \
117  { "expr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EXPR }, 0, 3, FLAGS, .unit = "function" }, \
118  { "ends_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_ENDS_WITH }, 0, 0, FLAGS, .unit = "function" }, \
119  { "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
120  { "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
121  { "direct", "reduce buffering when printing to user-set file or pipe", OFFSET(direct), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS }, \
122  { NULL } \
123 }
124 
125 static int same_str(MetadataContext *s, const char *value1, const char *value2)
126 {
127  return !strcmp(value1, value2);
128 }
129 
130 static int starts_with(MetadataContext *s, const char *value1, const char *value2)
131 {
132  return !strncmp(value1, value2, strlen(value2));
133 }
134 
135 static int ends_with(MetadataContext *s, const char *value1, const char *value2)
136 {
137  const int len1 = strlen(value1);
138  const int len2 = strlen(value2);
139 
140  return !strncmp(value1 + FFMAX(len1 - len2, 0), value2, len2);
141 }
142 
143 static int equal(MetadataContext *s, const char *value1, const char *value2)
144 {
145  float f1, f2;
146 
147  if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)
148  return 0;
149 
150  return fabsf(f1 - f2) < FLT_EPSILON;
151 }
152 
153 static int less(MetadataContext *s, const char *value1, const char *value2)
154 {
155  float f1, f2;
156 
157  if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)
158  return 0;
159 
160  return (f1 - f2) < FLT_EPSILON;
161 }
162 
163 static int greater(MetadataContext *s, const char *value1, const char *value2)
164 {
165  float f1, f2;
166 
167  if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)
168  return 0;
169 
170  return (f2 - f1) < FLT_EPSILON;
171 }
172 
173 static int parse_expr(MetadataContext *s, const char *value1, const char *value2)
174 {
175  double f1, f2;
176 
177  if (sscanf(value1, "%lf", &f1) + sscanf(value2, "%lf", &f2) != 2)
178  return 0;
179 
180  s->var_values[VAR_VALUE1] = s->var_values[VAR_FRAMEVAL] = f1;
181  s->var_values[VAR_VALUE2] = s->var_values[VAR_USERVAL] = f2;
182 
183  return av_expr_eval(s->expr, s->var_values, NULL);
184 }
185 
186 static void print_log(AVFilterContext *ctx, const char *msg, ...)
187 {
188  va_list argument_list;
189 
190  va_start(argument_list, msg);
191  if (msg)
192  av_vlog(ctx, AV_LOG_INFO, msg, argument_list);
193  va_end(argument_list);
194 }
195 
196 static void print_file(AVFilterContext *ctx, const char *msg, ...)
197 {
198  MetadataContext *s = ctx->priv;
199  va_list argument_list;
200 
201  va_start(argument_list, msg);
202  if (msg) {
203  char buf[128];
204  vsnprintf(buf, sizeof(buf), msg, argument_list);
205  avio_write(s->avio_context, buf, av_strnlen(buf, sizeof(buf)));
206  }
207  va_end(argument_list);
208 }
209 
211 {
212  MetadataContext *s = ctx->priv;
213  int ret;
214 
215  if (!s->key && s->mode != METADATA_PRINT && s->mode != METADATA_DELETE) {
216  av_log(ctx, AV_LOG_WARNING, "Metadata key must be set\n");
217  return AVERROR(EINVAL);
218  }
219 
220  if ((s->mode == METADATA_MODIFY ||
221  s->mode == METADATA_ADD) && !s->value) {
222  av_log(ctx, AV_LOG_WARNING, "Missing metadata value\n");
223  return AVERROR(EINVAL);
224  }
225 
226  switch (s->function) {
227  case METADATAF_SAME_STR:
228  s->compare = same_str;
229  break;
231  s->compare = starts_with;
232  break;
233  case METADATAF_ENDS_WITH:
234  s->compare = ends_with;
235  break;
236  case METADATAF_LESS:
237  s->compare = less;
238  break;
239  case METADATAF_EQUAL:
240  s->compare = equal;
241  break;
242  case METADATAF_GREATER:
243  s->compare = greater;
244  break;
245  case METADATAF_EXPR:
246  s->compare = parse_expr;
247  break;
248  default:
249  av_assert0(0);
250  };
251 
252  if (s->function == METADATAF_EXPR) {
253  if (!s->expr_str) {
254  av_log(ctx, AV_LOG_WARNING, "expr option not set\n");
255  return AVERROR(EINVAL);
256  }
257  if ((ret = av_expr_parse(&s->expr, s->expr_str,
258  var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
259  av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", s->expr_str);
260  return ret;
261  }
262  }
263 
264  if (s->mode == METADATA_PRINT && s->file_str) {
265  s->print = print_file;
266  } else {
267  s->print = print_log;
268  }
269 
270  s->avio_context = NULL;
271  if (s->file_str) {
272  if (!strcmp("-", s->file_str)) {
273  ret = avio_open(&s->avio_context, "pipe:1", AVIO_FLAG_WRITE);
274  } else {
275  ret = avio_open(&s->avio_context, s->file_str, AVIO_FLAG_WRITE);
276  }
277 
278  if (ret < 0) {
279  char buf[128];
280  av_strerror(ret, buf, sizeof(buf));
281  av_log(ctx, AV_LOG_ERROR, "Could not open %s: %s\n",
282  s->file_str, buf);
283  return ret;
284  }
285 
286  if (s->direct)
287  s->avio_context->direct = AVIO_FLAG_DIRECT;
288  }
289 
290  return 0;
291 }
292 
294 {
295  MetadataContext *s = ctx->priv;
296 
297  av_expr_free(s->expr);
298  s->expr = NULL;
299  if (s->avio_context) {
300  avio_closep(&s->avio_context);
301  }
302 }
303 
305 {
306  AVFilterContext *ctx = inlink->dst;
307  AVFilterLink *outlink = ctx->outputs[0];
308  MetadataContext *s = ctx->priv;
309  AVDictionary **metadata = &frame->metadata;
310  const AVDictionaryEntry *e;
311 
312  e = av_dict_get(*metadata, !s->key ? "" : s->key, NULL,
313  !s->key ? AV_DICT_IGNORE_SUFFIX: 0);
314 
315  switch (s->mode) {
316  case METADATA_SELECT:
317  if (!s->value && e && e->value) {
318  return ff_filter_frame(outlink, frame);
319  } else if (s->value && e && e->value &&
320  s->compare(s, e->value, s->value)) {
321  return ff_filter_frame(outlink, frame);
322  }
323  break;
324  case METADATA_ADD:
325  if (e && e->value) {
326  ;
327  } else {
328  av_dict_set(metadata, s->key, s->value, 0);
329  }
330  return ff_filter_frame(outlink, frame);
331  case METADATA_MODIFY:
332  if (e && e->value) {
333  av_dict_set(metadata, s->key, s->value, 0);
334  }
335  return ff_filter_frame(outlink, frame);
336  case METADATA_PRINT:
337  if (!s->key && e) {
338  s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%s\n",
339  inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
340  s->print(ctx, "%s=%s\n", e->key, e->value);
341  while ((e = av_dict_iterate(*metadata, e)) != NULL) {
342  s->print(ctx, "%s=%s\n", e->key, e->value);
343  }
344  } else if (e && e->value && (!s->value || (e->value && s->compare(s, e->value, s->value)))) {
345  s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%s\n",
346  inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
347  s->print(ctx, "%s=%s\n", s->key, e->value);
348  }
349  return ff_filter_frame(outlink, frame);
350  case METADATA_DELETE:
351  if (!s->key) {
352  av_dict_free(metadata);
353  } else if (e && e->value && (!s->value || s->compare(s, e->value, s->value))) {
354  av_dict_set(metadata, s->key, NULL, 0);
355  }
356  return ff_filter_frame(outlink, frame);
357  default:
358  av_assert0(0);
359  };
360 
362 
363  return 0;
364 }
365 
366 #if CONFIG_AMETADATA_FILTER
367 
369 AVFILTER_DEFINE_CLASS(ametadata);
370 
371 static const AVFilterPad ainputs[] = {
372  {
373  .name = "default",
374  .type = AVMEDIA_TYPE_AUDIO,
375  .filter_frame = filter_frame,
376  },
377 };
378 
379 const AVFilter ff_af_ametadata = {
380  .name = "ametadata",
381  .description = NULL_IF_CONFIG_SMALL("Manipulate audio frame metadata."),
382  .priv_size = sizeof(MetadataContext),
383  .priv_class = &ametadata_class,
384  .init = init,
385  .uninit = uninit,
386  FILTER_INPUTS(ainputs),
390 };
391 #endif /* CONFIG_AMETADATA_FILTER */
392 
393 #if CONFIG_METADATA_FILTER
394 
396 AVFILTER_DEFINE_CLASS(metadata);
397 
398 static const AVFilterPad inputs[] = {
399  {
400  .name = "default",
401  .type = AVMEDIA_TYPE_VIDEO,
402  .filter_frame = filter_frame,
403  },
404 };
405 
406 const AVFilter ff_vf_metadata = {
407  .name = "metadata",
408  .description = NULL_IF_CONFIG_SMALL("Manipulate video frame metadata."),
409  .priv_size = sizeof(MetadataContext),
410  .priv_class = &metadata_class,
411  .init = init,
412  .uninit = uninit,
417 };
418 #endif /* CONFIG_METADATA_FILTER */
av_vlog
void av_vlog(void *avcl, int level, const char *fmt, va_list vl)
Send the specified message to the log if the level is less than or equal to the current av_log_level.
Definition: log.c:431
DEFINE_OPTIONS
#define DEFINE_OPTIONS(filt_name, FLAGS)
Definition: f_metadata.c:101
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: f_metadata.c:293
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
AV_OPT_FLAG_VIDEO_PARAM
#define AV_OPT_FLAG_VIDEO_PARAM
Definition: opt.h:284
var_name
var_name
Definition: noise.c:46
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1007
METADATAF_GREATER
@ METADATAF_GREATER
Definition: f_metadata.c:56
METADATAF_SAME_STR
@ METADATAF_SAME_STR
Definition: f_metadata.c:52
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:100
starts_with
static int starts_with(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:130
VAR_VALUE1
@ VAR_VALUE1
Definition: f_metadata.c:71
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:452
AV_DICT_IGNORE_SUFFIX
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key,...
Definition: dict.h:75
METADATAF_STARTS_WITH
@ METADATAF_STARTS_WITH
Definition: f_metadata.c:53
float.h
METADATA_SELECT
@ METADATA_SELECT
Definition: f_metadata.c:43
AVDictionary
Definition: dict.c:34
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
video.h
AV_OPT_FLAG_FILTERING_PARAM
#define AV_OPT_FLAG_FILTERING_PARAM
a generic parameter which can be set by the user for filtering
Definition: opt.h:297
same_str
static int same_str(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:125
av_expr_parse
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:711
init
static av_cold int init(AVFilterContext *ctx)
Definition: f_metadata.c:210
av_strerror
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:108
MetadataMode
MetadataMode
Definition: f_metadata.c:42
METADATAF_LESS
@ METADATAF_LESS
Definition: f_metadata.c:54
fabsf
static __device__ float fabsf(float a)
Definition: cuda_runtime.h:181
av_expr_free
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:359
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
avassert.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
MetadataContext::expr
AVExpr * expr
Definition: f_metadata.c:87
av_cold
#define av_cold
Definition: attributes.h:90
ff_video_default_filterpad
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
Definition: video.c:37
av_dict_get
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:62
METADATAF_ENDS_WITH
@ METADATAF_ENDS_WITH
Definition: f_metadata.c:58
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVDictionaryEntry::key
char * key
Definition: dict.h:90
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
AVIO_FLAG_WRITE
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:637
ff_af_ametadata
const AVFilter ff_af_ametadata
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_expr_eval
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:793
AVExpr
Definition: eval.c:159
METADATAF_EQUAL
@ METADATAF_EQUAL
Definition: f_metadata.c:55
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
MetadataFunction
MetadataFunction
Definition: f_metadata.c:51
AV_OPT_FLAG_AUDIO_PARAM
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:283
frame
static AVFrame * frame
Definition: demux_decode.c:54
METADATA_ADD
@ METADATA_ADD
Definition: f_metadata.c:44
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
VAR_VARS_NB
@ VAR_VARS_NB
Definition: f_metadata.c:75
NULL
#define NULL
Definition: coverity.c:32
var_names
static const char *const var_names[]
Definition: f_metadata.c:62
av_strnlen
size_t static size_t av_strnlen(const char *s, size_t len)
Get the count of continuous non zero chars starting from the beginning.
Definition: avstring.h:141
greater
static int greater(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:163
av_printf_format
#define av_printf_format(fmtpos, attrpos)
Definition: attributes.h:161
MetadataContext::print
void(* print)(AVFilterContext *ctx, const char *msg,...) av_printf_format(2
Definition: f_metadata.c:95
ff_audio_default_filterpad
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
Definition: audio.c:33
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
METADATA_DELETE
@ METADATA_DELETE
Definition: f_metadata.c:46
MetadataContext::key
char * key
Definition: f_metadata.c:82
eval.h
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
parse_expr
static int parse_expr(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:173
av_ts2timestr
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:76
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:106
VAR_USERVAL
@ VAR_USERVAL
Definition: f_metadata.c:74
MetadataContext::direct
void(*) in direct)
Definition: f_metadata.c:95
avio.h
METADATAF_EXPR
@ METADATAF_EXPR
Definition: f_metadata.c:57
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:248
ends_with
static int ends_with(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:135
av_dict_free
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
Definition: dict.c:225
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:147
AVFILTER_DEFINE_CLASS
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:315
avio_closep
int avio_closep(AVIOContext **s)
Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...
Definition: aviobuf.c:1368
less
static int less(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:153
ff_vf_metadata
const AVFilter ff_vf_metadata
print_file
static void print_file(AVFilterContext *ctx, const char *msg,...)
Definition: f_metadata.c:196
internal.h
MetadataContext::compare
int(* compare)(struct MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:93
MetadataContext::value
char * value
Definition: f_metadata.c:83
vsnprintf
#define vsnprintf
Definition: snprintf.h:36
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
METADATA_NB
@ METADATA_NB
Definition: f_metadata.c:48
MetadataContext::mode
int mode
Definition: f_metadata.c:81
AVFilter
Filter definition.
Definition: avfilter.h:166
ret
ret
Definition: filter_design.txt:187
VAR_VALUE2
@ VAR_VALUE2
Definition: f_metadata.c:72
VAR_FRAMEVAL
@ VAR_FRAMEVAL
Definition: f_metadata.c:73
MetadataContext::file_str
char * file_str
Definition: f_metadata.c:91
avfilter.h
AVFrame::metadata
AVDictionary * metadata
metadata.
Definition: frame.h:708
AVFILTER_FLAG_METADATA_ONLY
#define AVFILTER_FLAG_METADATA_ONLY
The filter is a "metadata" filter - it does not modify the frame data in any way.
Definition: avfilter.h:133
METADATA_MODIFY
@ METADATA_MODIFY
Definition: f_metadata.c:45
avio_open
int avio_open(AVIOContext **s, const char *url, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:1303
AVFilterContext
An instance of a filter.
Definition: avfilter.h:409
AVIO_FLAG_DIRECT
#define AVIO_FLAG_DIRECT
Use direct mode.
Definition: avio.h:663
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
audio.h
METADATA_PRINT
@ METADATA_PRINT
Definition: f_metadata.c:47
METADATAF_NB
@ METADATAF_NB
Definition: f_metadata.c:59
AVDictionaryEntry
Definition: dict.h:89
equal
static int equal(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:143
print_log
static void print_log(AVFilterContext *ctx, const char *msg,...)
Definition: f_metadata.c:186
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
MetadataContext
Definition: f_metadata.c:78
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:88
MetadataContext::var_values
double var_values[VAR_VARS_NB]
Definition: f_metadata.c:88
timestamp.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: f_metadata.c:304
av_ts2str
#define av_ts2str(ts)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:54
AVDictionaryEntry::value
char * value
Definition: dict.h:91
avstring.h
int
int
Definition: ffmpeg_filter.c:424
MetadataContext::avio_context
AVIOContext * avio_context
Definition: f_metadata.c:90
av_dict_iterate
const AVDictionaryEntry * av_dict_iterate(const AVDictionary *m, const AVDictionaryEntry *prev)
Iterate over a dictionary.
Definition: dict.c:44
MetadataContext::expr_str
char * expr_str
Definition: f_metadata.c:86