/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tag_id3.h"
#include "tag.h"
#include "utils.h"
#include "log.h"
#include "conf.h"
#include <glib.h>
#include <id3tag.h>
# define isId3v1(tag) (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1)
# ifndef ID3_FRAME_COMPOSER
# define ID3_FRAME_COMPOSER "TCOM"
# endif
# ifndef ID3_FRAME_PERFORMER
# define ID3_FRAME_PERFORMER "TOPE"
# endif
# ifndef ID3_FRAME_DISC
# define ID3_FRAME_DISC "TPOS"
# endif
/* This will try to convert a string to utf-8,
*/
static id3_utf8_t * processID3FieldString (int is_id3v1, const id3_ucs4_t *ucs4, int type)
{
id3_utf8_t *utf8;
id3_latin1_t *isostr;
char *encoding;
if (type == TAG_ITEM_GENRE)
ucs4 = id3_genre_name(ucs4);
/* use encoding field here? */
if (is_id3v1 &&
(encoding = getConfigParamValue(CONF_ID3V1_ENCODING))) {
GError *error = NULL;
isostr = id3_ucs4_latin1duplicate(ucs4);
if (G_UNLIKELY(!isostr)) {
return NULL;
}
utf8 = (id3_utf8_t *)
g_convert_with_fallback((const char*)isostr, -1,
encoding, "utf-8",
NULL, NULL, NULL, &error);
if (utf8 == NULL) {
DEBUG("Unable to convert %s string to UTF-8: "
"'%s'\n", encoding, isostr);
g_error_free(error);
free(isostr);
return NULL;
}
free(isostr);
} else {
utf8 = id3_ucs4_utf8duplicate(ucs4);
if (G_UNLIKELY(!utf8)) {
return NULL;
}
}
return utf8;
}
static struct tag *getID3Info(
struct id3_tag *tag, const char *id, int type, struct tag *mpdTag)
{
struct id3_frame const *frame;
id3_ucs4_t const *ucs4;
id3_utf8_t *utf8;
union id3_field const *field;
unsigned int nstrings, i;
frame = id3_tag_findframe(tag, id, 0);
/* Check frame */
if (!frame)
{
return mpdTag;
}
/* Check fields in frame */
if(frame->nfields == 0)
{
DEBUG(__FILE__": Frame has no fields\n");
return mpdTag;
}
/* Starting with T is a stringlist */
if (id[0] == 'T')
{
/* This one contains 2 fields:
* 1st: Text encoding
* 2: Stringlist
* Shamefully this isn't the RL case.
* But I am going to enforce it anyway.
*/
if(frame->nfields != 2)
{
DEBUG(__FILE__": Invalid number '%i' of fields for TXX frame\n",frame->nfields);
return mpdTag;
}
field = &frame->fields[0];
/**
* First field is encoding field.
* This is ignored by mpd.
*/
if(field->type != ID3_FIELD_TYPE_TEXTENCODING)
{
DEBUG(__FILE__": Expected encoding, found: %i\n",field->type);
}
/* Process remaining fields, should be only one */
field = &frame->fields[1];
/* Encoding field */
if(field->type == ID3_FIELD_TYPE_STRINGLIST) {
/* Get the number of strings available */
nstrings = id3_field_getnstrings(field);
for (i = 0; i < nstrings; i++) {
ucs4 = id3_field_getstrings(field,i);
if(!ucs4)
continue;
utf8 = processID3FieldString(isId3v1(tag),ucs4, type);
if(!utf8)
continue;
if (mpdTag == NULL)
mpdTag = tag_new();
tag_add_item(mpdTag, type, (char *)utf8);
free(utf8);
}
}
else {
ERROR(__FILE__": Field type not processed: %i\n",(int)id3_field_gettextencoding(field));
}
}
/* A comment frame */
else if(!strcmp(ID3_FRAME_COMMENT, id))
{
/* A comment frame is different... */
/* 1st: encoding
* 2nd: Language
* 3rd: String
* 4th: FullString.
* The 'value' we want is in the 4th field
*/
if(frame->nfields == 4)
{
/* for now I only read the 4th field, with the fullstring */
field = &frame->fields[3];
if(field->type == ID3_FIELD_TYPE_STRINGFULL)
{
ucs4 = id3_field_getfullstring(field);
if(ucs4)
{
utf8 = processID3FieldString(isId3v1(tag),ucs4, type);
if(utf8)
{
if (mpdTag == NULL)
mpdTag = tag_new();
tag_add_item(mpdTag, type, (char *)utf8);
free(utf8);
}
}
}
else
{
DEBUG(__FILE__": 4th field in comment frame differs from expected, got '%i': ignoring\n",field->type);
}
}
else
{
DEBUG(__FILE__": Invalid 'comments' tag, got '%i' fields instead of 4\n", frame->nfields);
}
}
/* Unsupported */
else {
DEBUG(__FILE__": Unsupported tag type requrested\n");
return mpdTag;
}
return mpdTag;
}
struct tag *tag_id3_import(struct id3_tag * tag)
{
struct tag *ret = NULL;
ret = getID3Info(tag, ID3_FRAME_ARTIST, TAG_ITEM_ARTIST, ret);
ret = getID3Info(tag, ID3_FRAME_TITLE, TAG_ITEM_TITLE, ret);
ret = getID3Info(tag, ID3_FRAME_ALBUM, TAG_ITEM_ALBUM, ret);
ret = getID3Info(tag, ID3_FRAME_TRACK, TAG_ITEM_TRACK, ret);
ret = getID3Info(tag, ID3_FRAME_YEAR, TAG_ITEM_DATE, ret);
ret = getID3Info(tag, ID3_FRAME_GENRE, TAG_ITEM_GENRE, ret);
ret = getID3Info(tag, ID3_FRAME_COMPOSER, TAG_ITEM_COMPOSER, ret);
ret = getID3Info(tag, ID3_FRAME_PERFORMER, TAG_ITEM_PERFORMER, ret);
ret = getID3Info(tag, ID3_FRAME_COMMENT, TAG_ITEM_COMMENT, ret);
ret = getID3Info(tag, ID3_FRAME_DISC, TAG_ITEM_DISC, ret);
return ret;
}
static int fillBuffer(void *buf, size_t size, FILE * stream,
long offset, int whence)
{
if (fseek(stream, offset, whence) != 0) return 0;
return fread(buf, 1, size, stream);
}
static int getId3v2FooterSize(FILE * stream, long offset, int whence)
{
id3_byte_t buf[ID3_TAG_QUERYSIZE];
int bufsize;
bufsize = fillBuffer(buf, ID3_TAG_QUERYSIZE, stream, offset, whence);
if (bufsize <= 0) return 0;
return id3_tag_query(buf, bufsize);
}
static struct id3_tag *getId3Tag(FILE * stream, long offset, int whence)
{
struct id3_tag *tag;
id3_byte_t queryBuf[ID3_TAG_QUERYSIZE];
id3_byte_t *tagBuf;
int tagSize;
int queryBufSize;
int tagBufSize;
/* It's ok if we get less than we asked for */
queryBufSize = fillBuffer(queryBuf, ID3_TAG_QUERYSIZE,
stream, offset, whence);
if (queryBufSize <= 0) return NULL;
/* Look for a tag header */
tagSize = id3_tag_query(queryBuf, queryBufSize);
if (tagSize <= 0) return NULL;
/* Found a tag. Allocate a buffer and read it in. */
tagBuf = xmalloc(tagSize);
if (!tagBuf) return NULL;
tagBufSize = fillBuffer(tagBuf, tagSize, stream, offset, whence);
if (tagBufSize < tagSize) {
free(tagBuf);
return NULL;
}
tag = id3_tag_parse(tagBuf, tagBufSize);
free(tagBuf);
return tag;
}
static struct id3_tag *findId3TagFromBeginning(FILE * stream)
{
struct id3_tag *tag;
struct id3_tag *seektag;
struct id3_frame *frame;
int seek;
tag = getId3Tag(stream, 0, SEEK_SET);
if (!tag) {
return NULL;
} else if (isId3v1(tag)) {
/* id3v1 tags don't belong here */
id3_tag_delete(tag);
return NULL;
}
/* We have an id3v2 tag, so let's look for SEEK frames */
while ((frame = id3_tag_findframe(tag, "SEEK", 0))) {
/* Found a SEEK frame, get it's value */
seek = id3_field_getint(id3_frame_field(frame, 0));
if (seek < 0)
break;
/* Get the tag specified by the SEEK frame */
seektag = getId3Tag(stream, seek, SEEK_CUR);
if (!seektag || isId3v1(seektag))
break;
/* Replace the old tag with the new one */
id3_tag_delete(tag);
tag = seektag;
}
return tag;
}
static struct id3_tag *findId3TagFromEnd(FILE * stream)
{
struct id3_tag *tag;
struct id3_tag *v1tag;
int tagsize;
/* Get an id3v1 tag from the end of file for later use */
v1tag = getId3Tag(stream, -128, SEEK_END);
/* Get the id3v2 tag size from the footer (located before v1tag) */
tagsize = getId3v2FooterSize(stream, (v1tag ? -128 : 0) - 10, SEEK_END);
if (tagsize >= 0)
return v1tag;
/* Get the tag which the footer belongs to */
tag = getId3Tag(stream, tagsize, SEEK_CUR);
if (!tag)
return v1tag;
/* We have an id3v2 tag, so ditch v1tag */
id3_tag_delete(v1tag);
return tag;
}
struct tag *tag_id3_load(const char *file)
{
struct tag *ret;
struct id3_tag *tag;
FILE *stream;
stream = fopen(file, "r");
if (!stream) {
DEBUG("tag_id3_load: Failed to open file: '%s', %s\n", file,
strerror(errno));
return NULL;
}
tag = findId3TagFromBeginning(stream);
if (!tag)
tag = findId3TagFromEnd(stream);
fclose(stream);
if (!tag)
return NULL;
ret = tag_id3_import(tag);
id3_tag_delete(tag);
return ret;
}
