Libav 0.7.1
libavformat/metadata.c
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00001 /*
00002  * copyright (c) 2009 Michael Niedermayer
00003  *
00004  * This file is part of Libav.
00005  *
00006  * Libav is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * Libav is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with Libav; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include <strings.h>
00022 #include "avformat.h"
00023 #include "metadata.h"
00024 #include "libavutil/dict.h"
00025 
00026 #if FF_API_OLD_METADATA2
00027 AVDictionaryEntry *
00028 av_metadata_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
00029 {
00030     return av_dict_get(m, key, prev, flags);
00031 }
00032 
00033 int av_metadata_set2(AVDictionary **pm, const char *key, const char *value, int flags)
00034 {
00035     return av_dict_set(pm, key, value, flags);
00036 }
00037 
00038 void av_metadata_conv(AVFormatContext *ctx, const AVMetadataConv *d_conv,
00039                                             const AVMetadataConv *s_conv)
00040 {
00041     return;
00042 }
00043 
00044 void av_metadata_free(AVDictionary **pm)
00045 {
00046     av_dict_free(pm);
00047 }
00048 
00049 void av_metadata_copy(AVDictionary **dst, AVDictionary *src, int flags)
00050 {
00051     av_dict_copy(dst, src, flags);
00052 }
00053 #endif
00054 
00055 void ff_metadata_conv(AVDictionary **pm, const AVMetadataConv *d_conv,
00056                                        const AVMetadataConv *s_conv)
00057 {
00058     /* TODO: use binary search to look up the two conversion tables
00059        if the tables are getting big enough that it would matter speed wise */
00060     const AVMetadataConv *sc, *dc;
00061     AVDictionaryEntry *mtag = NULL;
00062     AVDictionary *dst = NULL;
00063     const char *key;
00064 
00065     if (d_conv == s_conv)
00066         return;
00067 
00068     while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
00069         key = mtag->key;
00070         if (s_conv)
00071             for (sc=s_conv; sc->native; sc++)
00072                 if (!strcasecmp(key, sc->native)) {
00073                     key = sc->generic;
00074                     break;
00075                 }
00076         if (d_conv)
00077             for (dc=d_conv; dc->native; dc++)
00078                 if (!strcasecmp(key, dc->generic)) {
00079                     key = dc->native;
00080                     break;
00081                 }
00082         av_dict_set(&dst, key, mtag->value, 0);
00083     }
00084     av_dict_free(pm);
00085     *pm = dst;
00086 }
00087 
00088 void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv,
00089                                                 const AVMetadataConv *s_conv)
00090 {
00091     int i;
00092     ff_metadata_conv(&ctx->metadata, d_conv, s_conv);
00093     for (i=0; i<ctx->nb_streams ; i++)
00094         ff_metadata_conv(&ctx->streams [i]->metadata, d_conv, s_conv);
00095     for (i=0; i<ctx->nb_chapters; i++)
00096         ff_metadata_conv(&ctx->chapters[i]->metadata, d_conv, s_conv);
00097     for (i=0; i<ctx->nb_programs; i++)
00098         ff_metadata_conv(&ctx->programs[i]->metadata, d_conv, s_conv);
00099 }
00100