1/*
2 * copyright (c) 2009 Michael Niedermayer
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include <strings.h>
22#include "avformat.h"
23#include "metadata.h"
24
25AVMetadataTag *
26av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags)
27{
28    unsigned int i, j;
29
30    if(!m)
31        return NULL;
32
33    if(prev) i= prev - m->elems + 1;
34    else     i= 0;
35
36    for(; i<m->count; i++){
37        const char *s= m->elems[i].key;
38        if(flags & AV_METADATA_MATCH_CASE) for(j=0;         s[j]  ==         key[j]  && key[j]; j++);
39        else                               for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
40        if(key[j])
41            continue;
42        if(s[j] && !(flags & AV_METADATA_IGNORE_SUFFIX))
43            continue;
44        return &m->elems[i];
45    }
46    return NULL;
47}
48
49int av_metadata_set(AVMetadata **pm, const char *key, const char *value)
50{
51    AVMetadata *m= *pm;
52    AVMetadataTag *tag= av_metadata_get(m, key, NULL, AV_METADATA_MATCH_CASE);
53
54    if(!m)
55        m=*pm= av_mallocz(sizeof(*m));
56
57    if(tag){
58        av_free(tag->value);
59        av_free(tag->key);
60        *tag= m->elems[--m->count];
61    }else{
62        AVMetadataTag *tmp= av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
63        if(tmp){
64            m->elems= tmp;
65        }else
66            return AVERROR(ENOMEM);
67    }
68    if(value){
69        m->elems[m->count].key  = av_strdup(key  );
70        m->elems[m->count].value= av_strdup(value);
71        m->count++;
72    }
73    if(!m->count) {
74        av_free(m->elems);
75        av_freep(pm);
76    }
77
78    return 0;
79}
80
81void av_metadata_free(AVMetadata **pm)
82{
83    AVMetadata *m= *pm;
84
85    if(m){
86        while(m->count--){
87            av_free(m->elems[m->count].key);
88            av_free(m->elems[m->count].value);
89        }
90        av_free(m->elems);
91    }
92    av_freep(pm);
93}
94
95static void metadata_conv(AVMetadata **pm, const AVMetadataConv *d_conv,
96                                           const AVMetadataConv *s_conv)
97{
98    /* TODO: use binary search to look up the two conversion tables
99       if the tables are getting big enough that it would matter speed wise */
100    const AVMetadataConv *sc, *dc;
101    AVMetadataTag *mtag = NULL;
102    AVMetadata *dst = NULL;
103    const char *key;
104
105    while((mtag=av_metadata_get(*pm, "", mtag, AV_METADATA_IGNORE_SUFFIX))) {
106        key = mtag->key;
107        if (s_conv != d_conv) {
108            if (s_conv)
109                for (sc=s_conv; sc->native; sc++)
110                if (!strcasecmp(key, sc->native)) {
111                    key = sc->generic;
112                    break;
113                }
114            if (d_conv)
115                for (dc=d_conv; dc->native; dc++)
116                    if (!strcasecmp(key, dc->generic)) {
117                    key = dc->native;
118                    break;
119                }
120        }
121        av_metadata_set(&dst, key, mtag->value);
122    }
123    av_metadata_free(pm);
124    *pm = dst;
125}
126
127void av_metadata_conv(AVFormatContext *ctx, const AVMetadataConv *d_conv,
128                                            const AVMetadataConv *s_conv)
129{
130    int i;
131    metadata_conv(&ctx->metadata, d_conv, s_conv);
132    for (i=0; i<ctx->nb_streams ; i++)
133        metadata_conv(&ctx->streams [i]->metadata, d_conv, s_conv);
134    for (i=0; i<ctx->nb_chapters; i++)
135        metadata_conv(&ctx->chapters[i]->metadata, d_conv, s_conv);
136    for (i=0; i<ctx->nb_programs; i++)
137        metadata_conv(&ctx->programs[i]->metadata, d_conv, s_conv);
138}
139