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/* Creative Commons has made the contents of this file
* available under a CC-GNU-LGPL license:
*
* http://creativecommons.org/licenses/LGPL/2.1/
*
* A copy of the full license can be found as part of this
* distribution in the file COPYING.
*
* You may use the liblicense software in accordance with the
* terms of that license. You agree that you are solely
* responsible for your use of the liblicense software and you
* represent and warrant to Creative Commons that your use
* of the liblicense software will comply with the CC-GNU-LGPL.
*
* Copyright 2007, Creative Commons, www.creativecommons.org.
* Copyright 2007, Jason Kivlighn.
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <liblicense.h>
#include <id3.h>
#define MAX_URI_LENGTH 50
static int id3_predicate2field(const char * predicate) {
if (strcmp(predicate, LL_LICENSE) == 0) {
return ID3FID_WWWCOPYRIGHT /* wcop */;
} else if (strcmp(predicate, LL_WEBSTATEMENT) == 0) {
return ID3FID_WWWAUDIOFILE /* woaf */;
} else {
return -LL_E_MODULE_WRITE_FAIL;
}
}
void id3_init()
{
}
char* id3_read( const char* filename, const ll_uri_t predicate )
{
int woaf_or_wcop;
char *buffer = NULL;
ID3Frame *frame;
ID3Tag *tag;
woaf_or_wcop = id3_predicate2field(predicate);
if (woaf_or_wcop < 0) {
return NULL;
}
tag = ID3Tag_New();
ID3Tag_Link(tag,filename);
frame = ID3Tag_FindFrameWithID(tag, woaf_or_wcop);
if (frame) {
ID3Field *field = ID3Frame_GetField(frame,ID3FN_URL);
buffer = malloc(sizeof(char)*(MAX_URI_LENGTH+1));
ID3Field_GetASCII(field,buffer,MAX_URI_LENGTH);
}
ID3Tag_Delete(tag);
return buffer;
}
int id3_write( const char* filename, const char * predicate, const char* uri )
{
/* Figure out which frame to use */
int woaf_or_wcop;
int err;
ID3Frame *frame;
ID3Tag *tag;
woaf_or_wcop = id3_predicate2field(predicate);
if (woaf_or_wcop < 0) {
return -LL_E_MODULE_WRITE_FAIL;
}
tag = ID3Tag_New();
ID3Tag_Link(tag,filename);
frame = ID3Tag_FindFrameWithID(tag, woaf_or_wcop);
if ( uri ) {
ID3Field * field;
if (!frame) {
frame = ID3Frame_NewID(woaf_or_wcop);
ID3Tag_AttachFrame(tag, frame);
}
field = ID3Frame_GetField(frame, ID3FN_URL);
ID3Field_SetASCII(field, uri);
} else {
if (frame) {
ID3Tag_RemoveFrame(tag,frame);
}
}
err = !ID3Tag_Update(tag);
ID3Tag_Delete(tag);
return err;
}
const char * id3_supported_predicates[] = {LL_LICENSE, LL_WEBSTATEMENT, NULL};
const char * id3_mime_types[] = {"audio/mpeg",
NULL};
LL_MODULE_DEFINE("id3.so",
"Write licenses within ID3 tags.",
"0.1",
LL_FEATURES_EMBED,
id3_supported_predicates,
id3_mime_types,
id3_init,
id3_read,
id3_write,
NULL /* no shutdown */);
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