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//---------------------------------------------------------------------------
// Provide read-only access to flac stream tags. Supports flac
// VORBIS_COMMENT metadata blocks via libFLAC.
//
// Copyright (c) 2003 by Tim Evans <t.evans@paradise.net.nz>
//
// Based on FlacId3v1Tag.cpp by Drew Hess <dhess@bothan.net>.
//
// Changes:
// June 05, 2005 (Hubert Chan <hubert@uhoreg.ca>)
// - don't use fixed-length buffers
// - use an array instead of a long if-else chain
//
/* This file is part of AlsaPlayer.
*
* AlsaPlayer 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 3 of the License, or
* (at your option) any later version.
*
* AlsaPlayer 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, see <http://www.gnu.org/licenses/>.
*/
//--------------------------------------------------------------------------
#include "FlacMetadataTag.h"
#include <cstring>
#include "reader.h"
extern "C" {
#include <FLAC/metadata.h>
}
static bool
find_vorbis_comment_metadata (const char *filename,
FLAC__StreamMetadata **metadata)
{
FLAC__Metadata_SimpleIterator *flac = FLAC__metadata_simple_iterator_new ();
if (!flac)
return false;
if (!FLAC__metadata_simple_iterator_init (flac, filename, true, false)) {
FLAC__metadata_simple_iterator_delete (flac);
return false;
}
bool status = false;
FLAC__MetadataType type;
do {
type = FLAC__metadata_simple_iterator_get_block_type (flac);
if (type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
status = true;
if (metadata)
*metadata = FLAC__metadata_simple_iterator_get_block (flac);
break;
}
}
while (FLAC__metadata_simple_iterator_next (flac));
FLAC__metadata_simple_iterator_delete (flac);
return status;
}
// Split the comment into key and value. Key and value are newly allocated
// strings and should be deleted after they are no longer needed.
// Returns true if the split was successful; false otherwise.
static bool
parse_comment (const FLAC__StreamMetadata_VorbisComment_Entry *comment,
char **key, char **value)
{
FLAC__byte *sep;
size_t key_len, value_len;
if ((sep = (FLAC__byte *) memchr(comment->entry, '=', comment->length))
== NULL)
return false;
key_len = sep - comment->entry;
value_len = comment->length - key_len - 1;
(*key) = new char[key_len+1];
memcpy (*key, comment->entry, key_len);
(*key)[key_len] = '\0';
(*value) = new char[value_len+1];
memcpy (*value, sep + 1, value_len);
(*value)[value_len] = '\0';
return true;
}
namespace Flac
{
const FlacMetadataTag::field_mapping_t FlacMetadataTag::field_mappings[] =
{
{ "TITLE", &FlacMetadataTag::_title },
{ "ARTIST", &FlacMetadataTag::_artist },
{ "TRACKNUMBER", &FlacMetadataTag::_track },
{ "ALBUM", &FlacMetadataTag::_album },
{ "YEAR", &FlacMetadataTag::_year },
{ "DESCRIPTION", &FlacMetadataTag::_comment },
{ NULL, NULL }
};
// static
bool
FlacMetadataTag::hasMetadata (const std::string & name)
{
return find_vorbis_comment_metadata (name.c_str (), NULL);
} // FlacMetadataTag::hasMetadata
FlacMetadataTag::FlacMetadataTag (const std::string & name)
: FlacTag (name)
{
FLAC__StreamMetadata *metadata = NULL;
FLAC__StreamMetadata_VorbisComment_Entry *comment_;
unsigned int i,j;
char *key, *value;
if (!find_vorbis_comment_metadata (name.c_str (), &metadata))
return;
for (i=0; i<metadata->data.vorbis_comment.num_comments; i++) {
comment_ = &metadata->data.vorbis_comment.comments[i];
if (parse_comment(comment_, &key, &value)) {
// look through the field mappings to see which field we have, and
// put it in the appropriate member
for (j=0; field_mappings[j].name != NULL; j++) {
if (strcmp (field_mappings[j].name, key) == 0)
{
(this->*(field_mappings[j].value)) = value;
}
}
delete key;
delete value;
}
}
FLAC__metadata_object_delete (metadata);
} // FlacMetadataTag::FlacMetadataTag
} // namespace Flac
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