Move metadata API from avcodec to avformat.

Originally committed as revision 16425 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 75 insertions, 0 deletions

diff --git a/libavformat/metadata.c b/libavformat/metadata.c
new file mode 100644
index 0000000000..d223d7c0d9
--- /dev/null
+++ b/libavformat/metadata.c
@@ -0,0 +1,75 @@
+/*
+ * 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 "metadata.h"
+
+AVMetaDataTag *
+av_metadata_get(struct 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_IGNORE_CASE) for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
+        else                                for(j=0;         s[j]  ==         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(struct AVMetaData **pm, AVMetaDataTag elem)
+{
+    struct AVMetaData *m= *pm;
+    AVMetaDataTag *tag= av_metadata_get(m, elem.key, NULL, 0);
+
+    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(elem.value){
+        elem.key  = av_strdup(elem.key  );
+        elem.value= av_strdup(elem.value);
+        m->elems[m->count++]= elem;
+    }
+    if(!m->count)
+        av_freep(pm);
+
+    return 0;
+}