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 "formats.h"
40 #include "internal.h"
41 #include "video.h"
42 
50 };
51 
61 };
62 
63 static const char *const var_names[] = {
64  "VALUE1",
65  "VALUE2",
66  "FRAMEVAL",
67  "USERVAL",
68  NULL
69 };
70 
71 enum var_name {
77 };
78 
79 typedef struct MetadataContext {
80  const AVClass *class;
81 
82  int mode;
83  char *key;
84  char *value;
85  int function;
86 
87  char *expr_str;
90 
92  char *file_str;
93 
95  const char *value1, const char *value2);
96  void (*print)(AVFilterContext *ctx, const char *msg, ...) av_printf_format(2, 3);
97 
98  int direct; // reduces buffering when printing to user-supplied URL
100 
101 #define OFFSET(x) offsetof(MetadataContext, x)
102 #define DEFINE_OPTIONS(filt_name, FLAGS) \
103 static const AVOption filt_name##_options[] = { \
104  { "mode", "set a mode of operation", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATA_NB-1, FLAGS, "mode" }, \
105  { "select", "select frame", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_SELECT }, 0, 0, FLAGS, "mode" }, \
106  { "add", "add new metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_ADD }, 0, 0, FLAGS, "mode" }, \
107  { "modify", "modify metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_MODIFY }, 0, 0, FLAGS, "mode" }, \
108  { "delete", "delete metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_DELETE }, 0, 0, FLAGS, "mode" }, \
109  { "print", "print metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_PRINT }, 0, 0, FLAGS, "mode" }, \
110  { "key", "set metadata key", OFFSET(key), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
111  { "value", "set metadata value", OFFSET(value), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
112  { "function", "function for comparing values", OFFSET(function), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATAF_NB-1, FLAGS, "function" }, \
113  { "same_str", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_SAME_STR }, 0, 3, FLAGS, "function" }, \
114  { "starts_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_STARTS_WITH }, 0, 0, FLAGS, "function" }, \
115  { "less", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_LESS }, 0, 3, FLAGS, "function" }, \
116  { "equal", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EQUAL }, 0, 3, FLAGS, "function" }, \
117  { "greater", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_GREATER }, 0, 3, FLAGS, "function" }, \
118  { "expr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EXPR }, 0, 3, FLAGS, "function" }, \
119  { "ends_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_ENDS_WITH }, 0, 0, FLAGS, "function" }, \
120  { "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
121  { "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
122  { "direct", "reduce buffering when printing to user-set file or pipe", OFFSET(direct), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS }, \
123  { NULL } \
124 }
125 
126 static int same_str(MetadataContext *s, const char *value1, const char *value2)
127 {
128  return !strcmp(value1, value2);
129 }
130 
131 static int starts_with(MetadataContext *s, const char *value1, const char *value2)
132 {
133  return !strncmp(value1, value2, strlen(value2));
134 }
135 
136 static int ends_with(MetadataContext *s, const char *value1, const char *value2)
137 {
138  const int len1 = strlen(value1);
139  const int len2 = strlen(value2);
140 
141  return !strncmp(value1 + FFMAX(len1 - len2, 0), value2, len2);
142 }
143 
144 static int equal(MetadataContext *s, const char *value1, const char *value2)
145 {
146  float f1, f2;
147 
148  if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)
149  return 0;
150 
151  return fabsf(f1 - f2) < FLT_EPSILON;
152 }
153 
154 static int less(MetadataContext *s, const char *value1, const char *value2)
155 {
156  float f1, f2;
157 
158  if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)
159  return 0;
160 
161  return (f1 - f2) < FLT_EPSILON;
162 }
163 
164 static int greater(MetadataContext *s, const char *value1, const char *value2)
165 {
166  float f1, f2;
167 
168  if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)
169  return 0;
170 
171  return (f2 - f1) < FLT_EPSILON;
172 }
173 
174 static int parse_expr(MetadataContext *s, const char *value1, const char *value2)
175 {
176  double f1, f2;
177 
178  if (sscanf(value1, "%lf", &f1) + sscanf(value2, "%lf", &f2) != 2)
179  return 0;
180 
181  s->var_values[VAR_VALUE1] = s->var_values[VAR_FRAMEVAL] = f1;
182  s->var_values[VAR_VALUE2] = s->var_values[VAR_USERVAL] = f2;
183 
184  return av_expr_eval(s->expr, s->var_values, NULL);
185 }
186 
187 static void print_log(AVFilterContext *ctx, const char *msg, ...)
188 {
189  va_list argument_list;
190 
191  va_start(argument_list, msg);
192  if (msg)
193  av_vlog(ctx, AV_LOG_INFO, msg, argument_list);
194  va_end(argument_list);
195 }
196 
197 static void print_file(AVFilterContext *ctx, const char *msg, ...)
198 {
199  MetadataContext *s = ctx->priv;
200  va_list argument_list;
201 
202  va_start(argument_list, msg);
203  if (msg) {
204  char buf[128];
205  vsnprintf(buf, sizeof(buf), msg, argument_list);
206  avio_write(s->avio_context, buf, av_strnlen(buf, sizeof(buf)));
207  }
208  va_end(argument_list);
209 }
210 
212 {
213  MetadataContext *s = ctx->priv;
214  int ret;
215 
216  if (!s->key && s->mode != METADATA_PRINT && s->mode != METADATA_DELETE) {
217  av_log(ctx, AV_LOG_WARNING, "Metadata key must be set\n");
218  return AVERROR(EINVAL);
219  }
220 
221  if ((s->mode == METADATA_MODIFY ||
222  s->mode == METADATA_ADD) && !s->value) {
223  av_log(ctx, AV_LOG_WARNING, "Missing metadata value\n");
224  return AVERROR(EINVAL);
225  }
226 
227  switch (s->function) {
228  case METADATAF_SAME_STR:
229  s->compare = same_str;
230  break;
232  s->compare = starts_with;
233  break;
234  case METADATAF_ENDS_WITH:
235  s->compare = ends_with;
236  break;
237  case METADATAF_LESS:
238  s->compare = less;
239  break;
240  case METADATAF_EQUAL:
241  s->compare = equal;
242  break;
243  case METADATAF_GREATER:
244  s->compare = greater;
245  break;
246  case METADATAF_EXPR:
247  s->compare = parse_expr;
248  break;
249  default:
250  av_assert0(0);
251  };
252 
253  if (s->function == METADATAF_EXPR) {
254  if (!s->expr_str) {
255  av_log(ctx, AV_LOG_WARNING, "expr option not set\n");
256  return AVERROR(EINVAL);
257  }
258  if ((ret = av_expr_parse(&s->expr, s->expr_str,
259  var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
260  av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", s->expr_str);
261  return ret;
262  }
263  }
264 
265  if (s->mode == METADATA_PRINT && s->file_str) {
266  s->print = print_file;
267  } else {
268  s->print = print_log;
269  }
270 
271  s->avio_context = NULL;
272  if (s->file_str) {
273  if (!strcmp("-", s->file_str)) {
274  ret = avio_open(&s->avio_context, "pipe:1", AVIO_FLAG_WRITE);
275  } else {
276  ret = avio_open(&s->avio_context, s->file_str, AVIO_FLAG_WRITE);
277  }
278 
279  if (ret < 0) {
280  char buf[128];
281  av_strerror(ret, buf, sizeof(buf));
282  av_log(ctx, AV_LOG_ERROR, "Could not open %s: %s\n",
283  s->file_str, buf);
284  return ret;
285  }
286 
287  if (s->direct)
288  s->avio_context->direct = AVIO_FLAG_DIRECT;
289  }
290 
291  return 0;
292 }
293 
295 {
296  MetadataContext *s = ctx->priv;
297 
298  av_expr_free(s->expr);
299  s->expr = NULL;
300  if (s->avio_context) {
301  avio_closep(&s->avio_context);
302  }
303 }
304 
306 {
307  AVFilterContext *ctx = inlink->dst;
308  AVFilterLink *outlink = ctx->outputs[0];
309  MetadataContext *s = ctx->priv;
310  AVDictionary **metadata = &frame->metadata;
312 
313  e = av_dict_get(*metadata, !s->key ? "" : s->key, NULL,
314  !s->key ? AV_DICT_IGNORE_SUFFIX: 0);
315 
316  switch (s->mode) {
317  case METADATA_SELECT:
318  if (!s->value && e && e->value) {
319  return ff_filter_frame(outlink, frame);
320  } else if (s->value && e && e->value &&
321  s->compare(s, e->value, s->value)) {
322  return ff_filter_frame(outlink, frame);
323  }
324  break;
325  case METADATA_ADD:
326  if (e && e->value) {
327  ;
328  } else {
329  av_dict_set(metadata, s->key, s->value, 0);
330  }
331  return ff_filter_frame(outlink, frame);
332  case METADATA_MODIFY:
333  if (e && e->value) {
334  av_dict_set(metadata, s->key, s->value, 0);
335  }
336  return ff_filter_frame(outlink, frame);
337  case METADATA_PRINT:
338  if (!s->key && e) {
339  s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%s\n",
340  inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
341  s->print(ctx, "%s=%s\n", e->key, e->value);
342  while ((e = av_dict_get(*metadata, "", e, AV_DICT_IGNORE_SUFFIX)) != NULL) {
343  s->print(ctx, "%s=%s\n", e->key, e->value);
344  }
345  } else if (e && e->value && (!s->value || (e->value && s->compare(s, e->value, s->value)))) {
346  s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%s\n",
347  inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
348  s->print(ctx, "%s=%s\n", s->key, e->value);
349  }
350  return ff_filter_frame(outlink, frame);
351  case METADATA_DELETE:
352  if (!s->key) {
353  av_dict_free(metadata);
354  } else if (e && e->value && (!s->value || s->compare(s, e->value, s->value))) {
355  av_dict_set(metadata, s->key, NULL, 0);
356  }
357  return ff_filter_frame(outlink, frame);
358  default:
359  av_assert0(0);
360  };
361 
363 
364  return 0;
365 }
366 
367 #if CONFIG_AMETADATA_FILTER
368 
370 AVFILTER_DEFINE_CLASS(ametadata);
371 
372 static const AVFilterPad ainputs[] = {
373  {
374  .name = "default",
375  .type = AVMEDIA_TYPE_AUDIO,
376  .filter_frame = filter_frame,
377  },
378 };
379 
380 static const AVFilterPad aoutputs[] = {
381  {
382  .name = "default",
383  .type = AVMEDIA_TYPE_AUDIO,
384  },
385 };
386 
387 const AVFilter ff_af_ametadata = {
388  .name = "ametadata",
389  .description = NULL_IF_CONFIG_SMALL("Manipulate audio frame metadata."),
390  .priv_size = sizeof(MetadataContext),
391  .priv_class = &ametadata_class,
392  .init = init,
393  .uninit = uninit,
394  FILTER_INPUTS(ainputs),
395  FILTER_OUTPUTS(aoutputs),
398 };
399 #endif /* CONFIG_AMETADATA_FILTER */
400 
401 #if CONFIG_METADATA_FILTER
402 
404 AVFILTER_DEFINE_CLASS(metadata);
405 
406 static const AVFilterPad inputs[] = {
407  {
408  .name = "default",
409  .type = AVMEDIA_TYPE_VIDEO,
410  .filter_frame = filter_frame,
411  },
412 };
413 
414 static const AVFilterPad outputs[] = {
415  {
416  .name = "default",
417  .type = AVMEDIA_TYPE_VIDEO,
418  },
419 };
420 
421 const AVFilter ff_vf_metadata = {
422  .name = "metadata",
423  .description = NULL_IF_CONFIG_SMALL("Manipulate video frame metadata."),
424  .priv_size = sizeof(MetadataContext),
425  .priv_class = &metadata_class,
426  .init = init,
427  .uninit = uninit,
432 };
433 #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:426
DEFINE_OPTIONS
#define DEFINE_OPTIONS(filt_name, FLAGS)
Definition: f_metadata.c:102
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:294
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
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1009
METADATAF_GREATER
@ METADATAF_GREATER
Definition: f_metadata.c:57
METADATAF_SAME_STR
@ METADATAF_SAME_STR
Definition: f_metadata.c:53
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:116
starts_with
static int starts_with(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:131
VAR_VALUE1
@ VAR_VALUE1
Definition: f_metadata.c:72
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
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:68
METADATAF_STARTS_WITH
@ METADATAF_STARTS_WITH
Definition: f_metadata.c:54
float.h
METADATA_SELECT
@ METADATA_SELECT
Definition: f_metadata.c:44
AVDictionary
Definition: dict.c:31
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:175
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:126
formats.h
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:685
init
static av_cold int init(AVFilterContext *ctx)
Definition: f_metadata.c:211
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:43
METADATAF_LESS
@ METADATAF_LESS
Definition: f_metadata.c:55
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:336
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:49
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:88
av_cold
#define av_cold
Definition: attributes.h:90
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:41
METADATAF_ENDS_WITH
@ METADATAF_ENDS_WITH
Definition: f_metadata.c:59
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVDictionaryEntry::key
char * key
Definition: dict.h:80
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:37
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:172
AVIO_FLAG_WRITE
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:629
var_name
var_name
Definition: noise_bsf.c:46
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:766
AVExpr
Definition: eval.c:157
METADATAF_EQUAL
@ METADATAF_EQUAL
Definition: f_metadata.c:56
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:190
MetadataFunction
MetadataFunction
Definition: f_metadata.c:52
AV_OPT_FLAG_AUDIO_PARAM
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:283
METADATA_ADD
@ METADATA_ADD
Definition: f_metadata.c:45
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
VAR_VARS_NB
@ VAR_VARS_NB
Definition: f_metadata.c:76
NULL
#define NULL
Definition: coverity.c:32
var_names
static const char *const var_names[]
Definition: f_metadata.c:63
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:164
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:96
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:47
MetadataContext::key
char * key
Definition: f_metadata.c:83
eval.h
AVIOContext
Bytestream IO Context.
Definition: avio.h:162
parse_expr
static int parse_expr(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:174
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:115
VAR_USERVAL
@ VAR_USERVAL
Definition: f_metadata.c:75
MetadataContext::direct
void(*) in direct)
Definition: f_metadata.c:96
avio.h
METADATAF_EXPR
@ METADATAF_EXPR
Definition: f_metadata.c:58
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:232
ends_with
static int ends_with(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:136
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:208
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:152
AVFILTER_DEFINE_CLASS
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:325
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:1288
less
static int less(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:154
ff_vf_metadata
const AVFilter ff_vf_metadata
print_file
static void print_file(AVFilterContext *ctx, const char *msg,...)
Definition: f_metadata.c:197
internal.h
MetadataContext::compare
int(* compare)(struct MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:94
MetadataContext::value
char * value
Definition: f_metadata.c:84
vsnprintf
#define vsnprintf
Definition: snprintf.h:36
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
METADATA_NB
@ METADATA_NB
Definition: f_metadata.c:49
MetadataContext::mode
int mode
Definition: f_metadata.c:82
AVFilter
Filter definition.
Definition: avfilter.h:171
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
VAR_VALUE2
@ VAR_VALUE2
Definition: f_metadata.c:73
VAR_FRAMEVAL
@ VAR_FRAMEVAL
Definition: f_metadata.c:74
MetadataContext::file_str
char * file_str
Definition: f_metadata.c:92
avfilter.h
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:143
METADATA_MODIFY
@ METADATA_MODIFY
Definition: f_metadata.c:46
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:1223
AVFilterContext
An instance of a filter.
Definition: avfilter.h:408
AVIO_FLAG_DIRECT
#define AVIO_FLAG_DIRECT
Use direct mode.
Definition: avio.h:655
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
audio.h
METADATA_PRINT
@ METADATA_PRINT
Definition: f_metadata.c:48
METADATAF_NB
@ METADATAF_NB
Definition: f_metadata.c:60
AVDictionaryEntry
Definition: dict.h:79
equal
static int equal(MetadataContext *s, const char *value1, const char *value2)
Definition: f_metadata.c:144
print_log
static void print_log(AVFilterContext *ctx, const char *msg,...)
Definition: f_metadata.c:187
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:191
MetadataContext
Definition: f_metadata.c:79
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:71
MetadataContext::var_values
double var_values[VAR_VARS_NB]
Definition: f_metadata.c:89
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:305
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:81
avstring.h
int
int
Definition: ffmpeg_filter.c:156
MetadataContext::avio_context
AVIOContext * avio_context
Definition: f_metadata.c:91
MetadataContext::expr_str
char * expr_str
Definition: f_metadata.c:87