mirror of
https://github.com/FFmpeg/FFmpeg.git
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92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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* copyright (c) 2009 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "metadata.h"
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AVMetadataTag *
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av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags)
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{
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unsigned int i, j;
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if(!m)
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return NULL;
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if(prev) i= prev - m->elems + 1;
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else i= 0;
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for(; i<m->count; i++){
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const char *s= m->elems[i].key;
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if(flags & AV_METADATA_MATCH_CASE) for(j=0; s[j] == key[j] && key[j]; j++);
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else for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
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if(key[j])
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continue;
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if(s[j] && !(flags & AV_METADATA_IGNORE_SUFFIX))
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continue;
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return &m->elems[i];
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}
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return NULL;
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}
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int av_metadata_set(AVMetadata **pm, const char *key, const char *value)
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{
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AVMetadata *m= *pm;
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AVMetadataTag *tag= av_metadata_get(m, key, NULL, AV_METADATA_MATCH_CASE);
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if(!m)
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m=*pm= av_mallocz(sizeof(*m));
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if(tag){
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av_free(tag->value);
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av_free(tag->key);
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*tag= m->elems[--m->count];
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}else{
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AVMetadataTag *tmp= av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
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if(tmp){
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m->elems= tmp;
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}else
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return AVERROR(ENOMEM);
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}
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if(value){
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m->elems[m->count].key = av_strdup(key );
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m->elems[m->count].value= av_strdup(value);
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m->count++;
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}
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if(!m->count) {
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av_free(m->elems);
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av_freep(pm);
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}
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return 0;
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}
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void av_metadata_free(AVMetadata **pm)
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{
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AVMetadata *m= *pm;
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if(m){
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while(m->count--){
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av_free(m->elems[m->count].key);
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av_free(m->elems[m->count].value);
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}
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av_free(m->elems);
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}
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av_freep(pm);
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}
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