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Data Structures

Simple key:value store. More...

Data Structures

struct  AVDictionaryEntry


#define AV_DICT_MATCH_CASE   1
 Take ownership of a key that's been allocated with av_malloc() and children.
 Take ownership of a value that's been allocated with av_malloc() and chilren.
 Don't overwrite existing entries.
#define AV_DICT_APPEND   32
 If the entry already exists, append to it.


AVDictionaryEntryav_dict_get (AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
 Get a dictionary entry with matching key.
int av_dict_count (const AVDictionary *m)
 Get number of entries in dictionary.
int av_dict_set (AVDictionary **pm, const char *key, const char *value, int flags)
 Set the given entry in *pm, overwriting an existing entry.
int av_dict_parse_string (AVDictionary **pm, const char *str, const char *key_val_sep, const char *pairs_sep, int flags)
 Parse the key/value pairs list and add to a dictionary.
void av_dict_copy (AVDictionary **dst, AVDictionary *src, int flags)
 Copy entries from one AVDictionary struct into another.
void av_dict_free (AVDictionary **m)
 Free all the memory allocated for an AVDictionary struct and all keys and values.

Detailed Description

Simple key:value store.

Dictionaries are used for storing key:value pairs. To create an AVDictionary, simply pass an address of a NULL pointer to av_dict_set(). NULL can be used as an empty dictionary wherever a pointer to an AVDictionary is required. Use av_dict_get() to retrieve an entry or iterate over all entries and finally av_dict_free() to free the dictionary and all its contents.

AVDictionary *d = NULL; // "create" an empty dictionary
av_dict_set(&d, "foo", "bar", 0); // add an entry
char *k = av_strdup("key"); // if your strings are already allocated,
char *v = av_strdup("value"); // you can avoid copying them like this
while (t = av_dict_get(d, "", t, AV_DICT_IGNORE_SUFFIX)) {
<....> // iterate over all entries in d

Macro Definition Documentation

#define AV_DICT_MATCH_CASE   1

Definition at line 67 of file dict.h.

Referenced by av_dict_get(), ff_mov_read_stsd_entries(), and get_date_tag().


Take ownership of a key that's been allocated with av_malloc() and children.

Definition at line 69 of file dict.h.

Referenced by av_dict_parse_string(), av_dict_set(), decode_text_chunk(), ff_vorbis_comment(), opt_show_entries(), parse_slave_options(), read_tag(), and read_ttag().


Don't overwrite existing entries.

Definition at line 73 of file dict.h.

Referenced by av_dict_set(), copy_metadata(), new_output_stream(), open_output_file(), read_ttag(), and transcode_init().

#define AV_DICT_APPEND   32

If the entry already exists, append to it.

Note that no delimiter is added, the strings are simply concatenated.

Definition at line 74 of file dict.h.

Referenced by av_dict_set(), new_video_stream(), and nist_read_header().

Function Documentation

AVDictionaryEntry* av_dict_get ( AVDictionary m,
const char *  key,
const AVDictionaryEntry prev,
int  flags 

Get a dictionary entry with matching key.

prevSet to the previous matching element to find the next. If set to NULL the first matching element is returned.
flagsAllows case as well as suffix-insensitive comparisons.
Found entry or NULL, changing key or value leads to undefined behavior.

Definition at line 39 of file dict.c.

Referenced by asf_write_header1(), assert_avoptions(), av_dict_copy(), av_dict_set(), av_dump_format(), av_opt_set_dict(), avi_write_header(), caf_write_header(), config_output(), configure_filtergraph(), dump_attachment(), dump_metadata(), dump_stream_format(), dv_init_mux(), dv_write_header(), export_orphan_timecode(), ff_ape_write(), ff_id3v2_write_apic(), ff_id3v2_write_metadata(), ff_metadata_conv(), ff_mov_read_stsd_entries(), ff_vorbiscomment_length(), ff_vorbiscomment_write(), ffm_write_header(), filter_codec_opts(), flv_write_header(), get_date_tag(), get_metadata_val(), gxf_write_header(), gxf_write_umf_material_description(), id3v1_create_tag(), id3v1_set_string(), id3v2_3_metadata_split_date(), init_input_stream(), lavfi_read_packet(), main(), mkv_write_attachments(), mkv_write_chapters(), mkv_write_header(), mkv_write_tag(), mkv_write_tags(), mkv_write_tracks(), mov_read_header(), mov_write_3gp_udta_tag(), mov_write_chpl_tag(), mov_write_header(), mov_write_int8_metadata(), mov_write_string_metadata(), mov_write_tkhd_tag(), mov_write_tmpo_tag(), mov_write_trkn_tag(), mov_write_uuidusmt_tag(), mp3_read_header(), mpc_read_header(), mpegts_write_header(), mpegts_write_pmt(), mxf_write_header(), open_input_file(), open_output_file(), open_slave(), put_meta(), read_thread(), rv10_write_header(), sap_write_header(), show_tags(), smjpeg_write_header(), sox_write_header(), stream_component_open(), transcode_init(), tta_read_header(), write_chapter(), write_globalinfo(), write_streaminfo(), write_table_entries_attrib(), write_table_redirector_legacy_attrib(), write_tags(), writer_print_integer(), writer_print_string(), wv_read_header(), and X264_init().

int av_dict_count ( const AVDictionary m)

Get number of entries in dictionary.

number of entries in dictionary

Definition at line 33 of file dict.c.

Referenced by asf_write_header1(), caf_write_header(), and dump_metadata().

int av_dict_set ( AVDictionary **  pm,
const char *  key,
const char *  value,
int  flags 

Set the given entry in *pm, overwriting an existing entry.

pmpointer to a pointer to a dictionary struct. If *pm is NULL a dictionary struct is allocated and put in *pm.
keyentry key to add to *pm (will be av_strduped depending on flags)
valueentry value to add to *pm (will be av_strduped depending on flags). Passing a NULL value will cause an existing entry to be deleted.
>= 0 on success otherwise an error code <0

Definition at line 62 of file dict.c.

Referenced by add_doubles_metadata(), add_metadata(), add_metadata_from_side_data(), add_shorts_metadata(), add_string_metadata(), add_timecode_metadata(), amf_parse_object(), ape_tag_read_field(), asf_read_header(), asf_read_picture(), av_dict_copy(), av_opt_set_dict(), avformat_find_stream_info(), avi_metadata_creation_time(), avi_read_nikon(), avi_read_tag(), avpriv_new_chapter(), build_file_streams(), config(), decode_frame(), decode_info_header(), decode_text_chunk(), dtshd_read_header(), dv_read_timecode(), export_orphan_timecode(), ff_frame_thread_encoder_init(), ff_id3v2_parse_apic(), ff_metadata_conv(), ff_parse_mpeg2_descriptor(), ff_rm_read_mdpr_codecdata(), ff_rtp_chain_mux_open(), ff_sauce_read(), ff_vorbis_comment(), ff_wms_parse_sdp_a_line(), filter_codec_opts(), filter_frame(), get_attachment(), get_meta(), get_metadata(), get_string(), get_tag(), hls_read_header(), http_open_cnx(), http_prepare_data(), id3v2_3_metadata_split_date(), init(), init_input_stream(), init_muxer(), ism_seek(), ism_write_header(), main(), matroska_convert_tag(), matroska_metadata_creation_time(), matroska_read_header(), merge_date(), modplug_load_metadata(), mov_metadata_creation_time(), mov_metadata_gnre(), mov_metadata_int8_bypass_padding(), mov_metadata_int8_no_padding(), mov_metadata_raw(), mov_metadata_track_or_disc_number(), mov_read_ftyp(), mov_read_hdlr(), mov_read_header(), mov_read_mdhd(), mov_read_tkhd(), mov_read_udta_string(), mxf_add_timecode_metadata(), new_output_stream(), new_video_stream(), nist_read_header(), nsv_parse_NSVf_header(), ogm_chapter(), open_input(), open_input_file(), open_output_file(), open_slave(), opt_bitrate(), opt_default(), opt_profile(), opt_show_entries(), opt_target(), opt_timecode(), parse_chunks(), parse_key_value_pair(), parse_picture(), parse_playlist(), parse_slave_options(), parse_tag(), parse_timecode_in_framenum_format(), prepare_sdp_description(), r3d_read_red1(), read_gab2_sub(), read_info_chunk(), read_tag(), read_ttag(), rm_read_metadata(), rpl_read_header(), rtmp_open(), sap_write_header(), sdt_cb(), select_frame(), smjpeg_read_header(), sox_read_header(), stream_component_open(), subviewer_read_header(), transcode_init(), try_decode_frame(), var_read_metadata(), vivo_read_header(), vqf_read_header(), and wc3_read_header().

int av_dict_parse_string ( AVDictionary **  pm,
const char *  str,
const char *  key_val_sep,
const char *  pairs_sep,
int  flags 

Parse the key/value pairs list and add to a dictionary.

key_val_sepa 0-terminated list of characters used to separate key from value
pairs_sepa 0-terminated list of characters used to separate two pairs from each other
flagsflags to use when adding to dictionary. AV_DICT_DONT_STRDUP_KEY and AV_DICT_DONT_STRDUP_VAL are ignored since the key/value tokens will always be duplicated.
0 on success, negative AVERROR code on failure

Definition at line 139 of file dict.c.

Referenced by init(), and X264_init().

void av_dict_copy ( AVDictionary **  dst,
AVDictionary src,
int  flags 

Copy entries from one AVDictionary struct into another.

dstpointer to a pointer to a AVDictionary struct. If *dst is NULL, this function will allocate a struct for you and put it in *dst
srcpointer to source AVDictionary struct
flagsflags to use when setting entries in *dst
metadata is read using the AV_DICT_IGNORE_SUFFIX flag

Definition at line 176 of file dict.c.

Referenced by avcodec_open2(), avfilter_copy_buffer_ref_props(), avfilter_copy_frame_props(), avfilter_ref_buffer(), avformat_open_input(), copy_chapters(), copy_metadata(), ff_frame_thread_encoder_init(), ff_wms_parse_sdp_a_line(), init_muxer(), mark_section_show_entries(), new_output_stream(), open_output_file(), open_slave(), and opt_default_new().

void av_dict_free ( AVDictionary **  m)