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/*
* Copyright (C) 2003-2010 The Music Player Daemon Project
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "flac_metadata.h"
#include "replay_gain_info.h"
#include "tag.h"
#include <glib.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
static bool
flac_find_float_comment(const FLAC__StreamMetadata *block,
const char *cmnt, float *fl)
{
int offset;
size_t pos;
int len;
unsigned char tmp, *p;
offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
cmnt);
if (offset < 0)
return false;
pos = strlen(cmnt) + 1; /* 1 is for '=' */
len = block->data.vorbis_comment.comments[offset].length - pos;
if (len <= 0)
return false;
p = &block->data.vorbis_comment.comments[offset].entry[pos];
tmp = p[len];
p[len] = '\0';
*fl = (float)atof((char *)p);
p[len] = tmp;
return true;
}
struct replay_gain_info *
flac_parse_replay_gain(const FLAC__StreamMetadata *block)
{
struct replay_gain_info *rgi;
bool found = false;
rgi = replay_gain_info_new();
if (flac_find_float_comment(block, "replaygain_album_gain",
&rgi->tuples[REPLAY_GAIN_ALBUM].gain))
found = true;
if (flac_find_float_comment(block, "replaygain_album_peak",
&rgi->tuples[REPLAY_GAIN_ALBUM].peak))
found = true;
if (flac_find_float_comment(block, "replaygain_track_gain",
&rgi->tuples[REPLAY_GAIN_TRACK].gain))
found = true;
if (flac_find_float_comment(block, "replaygain_track_peak",
&rgi->tuples[REPLAY_GAIN_TRACK].peak))
found = true;
if (!found) {
replay_gain_info_free(rgi);
rgi = NULL;
}
return rgi;
}
/**
* Checks if the specified name matches the entry's name, and if yes,
* returns the comment value (not null-temrinated).
*/
static const char *
flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
const char *name, const char *char_tnum, size_t *length_r)
{
size_t name_length = strlen(name);
size_t char_tnum_length = 0;
const char *comment = (const char*)entry->entry;
if (entry->length <= name_length ||
g_ascii_strncasecmp(comment, name, name_length) != 0)
return NULL;
if (char_tnum != NULL) {
char_tnum_length = strlen(char_tnum);
if (entry->length > name_length + char_tnum_length + 2 &&
comment[name_length] == '[' &&
g_ascii_strncasecmp(comment + name_length + 1,
char_tnum, char_tnum_length) == 0 &&
comment[name_length + char_tnum_length + 1] == ']')
name_length = name_length + char_tnum_length + 2;
else if (entry->length > name_length + char_tnum_length &&
g_ascii_strncasecmp(comment + name_length,
char_tnum, char_tnum_length) == 0)
name_length = name_length + char_tnum_length;
}
if (comment[name_length] == '=') {
*length_r = entry->length - name_length - 1;
return comment + name_length + 1;
}
return NULL;
}
/**
* Check if the comment's name equals the passed name, and if so, copy
* the comment value into the tag.
*/
static bool
flac_copy_comment(struct tag *tag,
const FLAC__StreamMetadata_VorbisComment_Entry *entry,
const char *name, enum tag_type tag_type,
const char *char_tnum)
{
const char *value;
size_t value_length;
value = flac_comment_value(entry, name, char_tnum, &value_length);
if (value != NULL) {
tag_add_item_n(tag, tag_type, value, value_length);
return true;
}
return false;
}
/* tracknumber is used in VCs, MPD uses "track" ..., all the other
* tag names match */
static const char *VORBIS_COMMENT_TRACK_KEY = "tracknumber";
static const char *VORBIS_COMMENT_DISC_KEY = "discnumber";
static void
flac_parse_comment(struct tag *tag, const char *char_tnum,
const FLAC__StreamMetadata_VorbisComment_Entry *entry)
{
assert(tag != NULL);
if (flac_copy_comment(tag, entry, VORBIS_COMMENT_TRACK_KEY,
TAG_TRACK, char_tnum) ||
flac_copy_comment(tag, entry, VORBIS_COMMENT_DISC_KEY,
TAG_DISC, char_tnum) ||
flac_copy_comment(tag, entry, "album artist",
TAG_ALBUM_ARTIST, char_tnum))
return;
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (flac_copy_comment(tag, entry,
tag_item_names[i], i, char_tnum))
return;
}
void
flac_vorbis_comments_to_tag(struct tag *tag, const char *char_tnum,
const FLAC__StreamMetadata_VorbisComment *comment)
{
for (unsigned i = 0; i < comment->num_comments; ++i)
flac_parse_comment(tag, char_tnum, &comment->comments[i]);
}
void
flac_tag_apply_metadata(struct tag *tag, const char *track,
const FLAC__StreamMetadata *block)
{
switch (block->type) {
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
flac_vorbis_comments_to_tag(tag, track,
&block->data.vorbis_comment);
break;
case FLAC__METADATA_TYPE_STREAMINFO:
tag->time = flac_duration(&block->data.stream_info);
break;
default:
break;
}
}
struct tag *
flac_tag_load(const char *file, const char *char_tnum)
{
struct tag *tag;
FLAC__Metadata_SimpleIterator *it;
FLAC__StreamMetadata *block = NULL;
it = FLAC__metadata_simple_iterator_new();
if (!FLAC__metadata_simple_iterator_init(it, file, 1, 0)) {
const char *err;
FLAC_API FLAC__Metadata_SimpleIteratorStatus s;
s = FLAC__metadata_simple_iterator_status(it);
switch (s) { /* slightly more human-friendly messages: */
case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
err = "illegal input";
break;
case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
err = "error opening file";
break;
case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
err = "not a FLAC file";
break;
default:
err = FLAC__Metadata_SimpleIteratorStatusString[s];
}
g_debug("Reading '%s' metadata gave the following error: %s\n",
file, err);
FLAC__metadata_simple_iterator_delete(it);
return NULL;
}
tag = tag_new();
do {
block = FLAC__metadata_simple_iterator_get_block(it);
if (!block)
break;
flac_tag_apply_metadata(tag, char_tnum, block);
FLAC__metadata_object_delete(block);
} while (FLAC__metadata_simple_iterator_next(it));
FLAC__metadata_simple_iterator_delete(it);
if (!tag_is_defined(tag)) {
tag_free(tag);
tag = NULL;
}
return tag;
}
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