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/*
* copyright (c) 2009 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <strings.h>
#include "avformat.h"
#include "metadata.h"
AVMetadataTag *
av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags)
{
unsigned int i, j;
if(!m)
return NULL;
if(prev) i= prev - m->elems + 1;
else i= 0;
for(; i<m->count; i++){
const char *s= m->elems[i].key;
if(flags & AV_METADATA_MATCH_CASE) for(j=0; s[j] == key[j] && key[j]; j++);
else for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
if(key[j])
continue;
if(s[j] && !(flags & AV_METADATA_IGNORE_SUFFIX))
continue;
return &m->elems[i];
}
return NULL;
}
int av_metadata_set(AVMetadata **pm, const char *key, const char *value)
{
AVMetadata *m= *pm;
AVMetadataTag *tag= av_metadata_get(m, key, NULL, AV_METADATA_MATCH_CASE);
if(!m)
m=*pm= av_mallocz(sizeof(*m));
if(tag){
av_free(tag->value);
av_free(tag->key);
*tag= m->elems[--m->count];
}else{
AVMetadataTag *tmp= av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
if(tmp){
m->elems= tmp;
}else
return AVERROR(ENOMEM);
}
if(value){
m->elems[m->count].key = av_strdup(key );
m->elems[m->count].value= av_strdup(value);
m->count++;
}
if(!m->count) {
av_free(m->elems);
av_freep(pm);
}
return 0;
}
void av_metadata_free(AVMetadata **pm)
{
AVMetadata *m= *pm;
if(m){
while(m->count--){
av_free(m->elems[m->count].key);
av_free(m->elems[m->count].value);
}
av_free(m->elems);
}
av_freep(pm);
}
static void metadata_conv(AVMetadata **pm, const AVMetadataConv *d_conv,
const AVMetadataConv *s_conv)
{
/* TODO: use binary search to look up the two conversion tables
if the tables are getting big enough that it would matter speed wise */
const AVMetadataConv *sc, *dc;
AVMetadataTag *mtag = NULL;
AVMetadata *dst = NULL;
const char *key;
while((mtag=av_metadata_get(*pm, "", mtag, AV_METADATA_IGNORE_SUFFIX))) {
key = mtag->key;
if (s_conv != d_conv) {
if (s_conv)
for (sc=s_conv; sc->native; sc++)
if (!strcasecmp(key, sc->native)) {
key = sc->generic;
break;
}
if (d_conv)
for (dc=d_conv; dc->native; dc++)
if (!strcasecmp(key, dc->generic)) {
key = dc->native;
break;
}
}
av_metadata_set(&dst, key, mtag->value);
}
av_metadata_free(pm);
*pm = dst;
}
void av_metadata_conv(AVFormatContext *ctx, const AVMetadataConv *d_conv,
const AVMetadataConv *s_conv)
{
int i;
metadata_conv(&ctx->metadata, d_conv, s_conv);
for (i=0; i<ctx->nb_streams ; i++)
metadata_conv(&ctx->streams [i]->metadata, d_conv, s_conv);
for (i=0; i<ctx->nb_chapters; i++)
metadata_conv(&ctx->chapters[i]->metadata, d_conv, s_conv);
for (i=0; i<ctx->nb_programs; i++)
metadata_conv(&ctx->programs[i]->metadata, d_conv, s_conv);
}
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