/*
* Copyright (C) 2003-2012 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 "FLACMetaData.hxx"
extern "C" {
#include "XiphTags.h"
}
#include "tag.h"
#include "tag_handler.h"
#include "tag_table.h"
#include "replay_gain_info.h"
#include <glib.h>
#include <assert.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;
}
bool
flac_parse_replay_gain(struct replay_gain_info *rgi,
const FLAC__StreamMetadata *block)
{
bool found = false;
replay_gain_info_init(rgi);
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;
return found;
}
static bool
flac_find_string_comment(const FLAC__StreamMetadata *block,
const char *cmnt, char **str)
{
int offset;
size_t pos;
int len;
const unsigned char *p;
*str = nullptr;
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];
*str = g_strndup((const char *)p, len);
return true;
}
bool
flac_parse_mixramp(char **mixramp_start, char **mixramp_end,
const FLAC__StreamMetadata *block)
{
bool found = false;
if (flac_find_string_comment(block, "mixramp_start", mixramp_start))
found = true;
if (flac_find_string_comment(block, "mixramp_end", mixramp_end))
found = true;
return found;
}
/**
* 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, size_t *length_r)
{
size_t name_length = strlen(name);
const char *comment = (const char*)entry->entry;
if (entry->length <= name_length ||
g_ascii_strncasecmp(comment, name, name_length) != 0)
return nullptr;
if (comment[name_length] == '=') {
*length_r = entry->length - name_length - 1;
return comment + name_length + 1;
}
return nullptr;
}
/**
* 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(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
const char *name, enum tag_type tag_type,
const struct tag_handler *handler, void *handler_ctx)
{
const char *value;
size_t value_length;
value = flac_comment_value(entry, name, &value_length);
if (value != nullptr) {
char *p = g_strndup(value, value_length);
tag_handler_invoke_tag(handler, handler_ctx, tag_type, p);
g_free(p);
return true;
}
return false;
}
static void
flac_scan_comment(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
const struct tag_handler *handler, void *handler_ctx)
{
if (handler->pair != nullptr) {
char *name = g_strdup((const char*)entry->entry);
char *value = strchr(name, '=');
if (value != nullptr && value > name) {
*value++ = 0;
tag_handler_invoke_pair(handler, handler_ctx,
name, value);
}
g_free(name);
}
for (const struct tag_table *i = xiph_tags; i->name != nullptr; ++i)
if (flac_copy_comment(entry, i->name, i->type,
handler, handler_ctx))
return;
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (flac_copy_comment(entry,
tag_item_names[i], (enum tag_type)i,
handler, handler_ctx))
return;
}
static void
flac_scan_comments(const FLAC__StreamMetadata_VorbisComment *comment,
const struct tag_handler *handler, void *handler_ctx)
{
for (unsigned i = 0; i < comment->num_comments; ++i)
flac_scan_comment(&comment->comments[i],
handler, handler_ctx);
}
void
flac_scan_metadata(const FLAC__StreamMetadata *block,
const struct tag_handler *handler, void *handler_ctx)
{
switch (block->type) {
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
flac_scan_comments(&block->data.vorbis_comment,
handler, handler_ctx);
break;
case FLAC__METADATA_TYPE_STREAMINFO:
if (block->data.stream_info.sample_rate > 0)
tag_handler_invoke_duration(handler, handler_ctx,
flac_duration(&block->data.stream_info));
break;
default:
break;
}
}
void
flac_vorbis_comments_to_tag(struct tag *tag,
const FLAC__StreamMetadata_VorbisComment *comment)
{
flac_scan_comments(comment, &add_tag_handler, tag);
}
void
FLACMetadataChain::Scan(const struct tag_handler *handler, void *handler_ctx)
{
FLACMetadataIterator iterator(*this);
do {
FLAC__StreamMetadata *block = iterator.GetBlock();
if (block == nullptr)
break;
flac_scan_metadata(block, handler, handler_ctx);
} while (iterator.Next());
}
