author | Wuzzy <almikes@aol.com> |
Sat, 15 Apr 2017 06:52:14 +0200 | |
changeset 12256 | 789277d46784 |
parent 7813 | 7ac83d79b897 |
permissions | -rw-r--r-- |
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/* |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Public dictionary API. |
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*/ |
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#ifndef AVUTIL_DICT_H |
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#define AVUTIL_DICT_H |
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/** |
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* @addtogroup lavu_dict AVDictionary |
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* @ingroup lavu_data |
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* |
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* @brief Simple key:value store |
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* |
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* @{ |
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* Dictionaries are used for storing key:value pairs. To create |
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* an AVDictionary, simply pass an address of a NULL pointer to |
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* av_dict_set(). NULL can be used as an empty dictionary wherever |
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* a pointer to an AVDictionary is required. |
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* Use av_dict_get() to retrieve an entry or iterate over all |
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* entries and finally av_dict_free() to free the dictionary |
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* and all its contents. |
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* |
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* @code |
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* AVDictionary *d = NULL; // "create" an empty dictionary |
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* av_dict_set(&d, "foo", "bar", 0); // add an entry |
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* |
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* char *k = av_strdup("key"); // if your strings are already allocated, |
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* char *v = av_strdup("value"); // you can avoid copying them like this |
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* av_dict_set(&d, k, v, AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); |
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* |
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* AVDictionaryEntry *t = NULL; |
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* while (t = av_dict_get(d, "", t, AV_DICT_IGNORE_SUFFIX)) { |
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* <....> // iterate over all entries in d |
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* } |
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* |
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* av_dict_free(&d); |
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* @endcode |
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* |
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*/ |
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#define AV_DICT_MATCH_CASE 1 |
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#define AV_DICT_IGNORE_SUFFIX 2 |
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#define AV_DICT_DONT_STRDUP_KEY 4 /**< Take ownership of a key that's been |
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allocated with av_malloc() and children. */ |
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#define AV_DICT_DONT_STRDUP_VAL 8 /**< Take ownership of a value that's been |
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allocated with av_malloc() and chilren. */ |
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#define AV_DICT_DONT_OVERWRITE 16 ///< Don't overwrite existing entries. |
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#define AV_DICT_APPEND 32 /**< If the entry already exists, append to it. Note that no |
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delimiter is added, the strings are simply concatenated. */ |
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typedef struct AVDictionaryEntry { |
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char *key; |
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char *value; |
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} AVDictionaryEntry; |
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typedef struct AVDictionary AVDictionary; |
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/** |
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* Get a dictionary entry with matching key. |
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* |
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* @param prev Set to the previous matching element to find the next. |
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* If set to NULL the first matching element is returned. |
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* @param flags Allows case as well as suffix-insensitive comparisons. |
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* @return Found entry or NULL, changing key or value leads to undefined behavior. |
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*/ |
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AVDictionaryEntry * |
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av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags); |
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/** |
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* Get number of entries in dictionary. |
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* |
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* @param m dictionary |
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* @return number of entries in dictionary |
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*/ |
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int av_dict_count(const AVDictionary *m); |
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/** |
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* Set the given entry in *pm, overwriting an existing entry. |
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* |
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* @param pm pointer to a pointer to a dictionary struct. If *pm is NULL |
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* a dictionary struct is allocated and put in *pm. |
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* @param key entry key to add to *pm (will be av_strduped depending on flags) |
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* @param value entry value to add to *pm (will be av_strduped depending on flags). |
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* Passing a NULL value will cause an existing entry to be deleted. |
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* @return >= 0 on success otherwise an error code <0 |
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*/ |
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int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags); |
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/** |
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* Copy entries from one AVDictionary struct into another. |
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* @param dst pointer to a pointer to a AVDictionary struct. If *dst is NULL, |
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* this function will allocate a struct for you and put it in *dst |
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* @param src pointer to source AVDictionary struct |
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* @param flags flags to use when setting entries in *dst |
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* @note metadata is read using the AV_DICT_IGNORE_SUFFIX flag |
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*/ |
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void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags); |
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/** |
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* Free all the memory allocated for an AVDictionary struct |
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* and all keys and values. |
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*/ |
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void av_dict_free(AVDictionary **m); |
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/** |
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* @} |
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*/ |
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#endif /* AVUTIL_DICT_H */ |