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ffmpeg / libavformat / metadata.c @ 1f5e9ede

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/*
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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 <strings.h>
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#include "avformat.h"
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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_set2(AVMetadata **pm, const char *key, const char *value, int flags)
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{
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    AVMetadata *m= *pm;
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    AVMetadataTag *tag= av_metadata_get(m, key, NULL, flags);
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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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        if (flags & AV_METADATA_DONT_OVERWRITE)
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            return 0;
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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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        if(flags & AV_METADATA_DONT_STRDUP_KEY){
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            m->elems[m->count].key  = key;
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        }else
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        m->elems[m->count].key  = av_strdup(key  );
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        if(flags & AV_METADATA_DONT_STRDUP_VAL){
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            m->elems[m->count].value= value;
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        }else
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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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#if FF_API_OLD_METADATA
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int av_metadata_set(AVMetadata **pm, const char *key, const char *value)
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{
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    return av_metadata_set2(pm, key, value, 0);
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}
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#endif
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#if FF_API_OLD_METADATA2
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void av_metadata_conv(AVFormatContext *ctx, const AVMetadataConv *d_conv,
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                                            const AVMetadataConv *s_conv)
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{
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    return;
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}
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#endif
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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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void ff_metadata_conv(AVMetadata **pm, const AVMetadataConv *d_conv,
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                                       const AVMetadataConv *s_conv)
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{
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    /* TODO: use binary search to look up the two conversion tables
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       if the tables are getting big enough that it would matter speed wise */
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    const AVMetadataConv *sc, *dc;
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    AVMetadataTag *mtag = NULL;
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    AVMetadata *dst = NULL;
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    const char *key;
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    if (d_conv == s_conv)
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        return;
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    while((mtag=av_metadata_get(*pm, "", mtag, AV_METADATA_IGNORE_SUFFIX))) {
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        key = mtag->key;
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        if (s_conv)
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            for (sc=s_conv; sc->native; sc++)
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                if (!strcasecmp(key, sc->native)) {
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                    key = sc->generic;
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                    break;
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                }
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        if (d_conv)
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            for (dc=d_conv; dc->native; dc++)
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                if (!strcasecmp(key, dc->generic)) {
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                    key = dc->native;
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                    break;
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                }
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        av_metadata_set2(&dst, key, mtag->value, 0);
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    }
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    av_metadata_free(pm);
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    *pm = dst;
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}
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void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv,
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                                                const AVMetadataConv *s_conv)
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{
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    int i;
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    ff_metadata_conv(&ctx->metadata, d_conv, s_conv);
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    for (i=0; i<ctx->nb_streams ; i++)
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        ff_metadata_conv(&ctx->streams [i]->metadata, d_conv, s_conv);
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    for (i=0; i<ctx->nb_chapters; i++)
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        ff_metadata_conv(&ctx->chapters[i]->metadata, d_conv, s_conv);
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    for (i=0; i<ctx->nb_programs; i++)
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        ff_metadata_conv(&ctx->programs[i]->metadata, d_conv, s_conv);
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}
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void av_metadata_copy(AVMetadata **dst, AVMetadata *src, int flags)
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{
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    AVMetadataTag *t = NULL;
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    while ((t = av_metadata_get(src, "", t, AV_METADATA_IGNORE_SUFFIX)))
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        av_metadata_set2(dst, t->key, t->value, flags);
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}