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lavu/dict: add AV_DICT_DEDUP

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This is useful when multiple metadata inputs may set the same value
(e.g. both a container-specific header and an ID3 tag).

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
rcombs
2022-08-24 19:27:20 -05:00
committed by Michael Niedermayer
parent 779cbc2b97
commit 19e9a203b7
2 changed files with 12 additions and 0 deletions
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11
libavutil/dict.c
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@ -101,6 +101,17 @@ int av_dict_set(AVDictionary **pm, const char *key, const char *value,
}
if (!(flags & AV_DICT_MULTIKEY)) {
tag = av_dict_get(m, key, NULL, flags);
} else if (flags & AV_DICT_DEDUP) {
while ((tag = av_dict_get(m, key, tag, flags))) {
if ((!value && !tag->value) ||
(value && tag->value && !strcmp(value, tag->value))) {
if (flags & AV_DICT_DONT_STRDUP_KEY)
av_free((void*)key);
if (flags & AV_DICT_DONT_STRDUP_VAL)
av_free((void*)value);
return 0;
}
}
}
if (flags & AV_DICT_DONT_STRDUP_KEY)
copy_key = (void *)key;

1
libavutil/dict.h
View File

@ -82,6 +82,7 @@
#define AV_DICT_APPEND 32 /**< If the entry already exists, append to it. Note that no
delimiter is added, the strings are simply concatenated. */
#define AV_DICT_MULTIKEY 64 /**< Allow to store several equal keys in the dictionary */
#define AV_DICT_DEDUP 128 /**< If inserting a value that already exists for a key, do nothing. Only relevant with AV_DICT_MULTIKEY. */
/**
* @}
*/