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/*
* Copyright 2003-2017 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"
#include "lib/xiph/XiphTags.hxx"
#include "MixRampInfo.hxx"
#include "tag/Handler.hxx"
#include "tag/Table.hxx"
#include "tag/Builder.hxx"
#include "tag/Tag.hxx"
#include "tag/VorbisComment.hxx"
#include "tag/ReplayGain.hxx"
#include "tag/MixRamp.hxx"
#include "ReplayGainInfo.hxx"
#include "util/DivideString.hxx"
bool
flac_parse_replay_gain(ReplayGainInfo &rgi,
const FLAC__StreamMetadata_VorbisComment &vc)
{
rgi.Clear();
bool found = false;
const auto *comments = vc.comments;
for (FLAC__uint32 i = 0, n = vc.num_comments; i < n; ++i)
if (ParseReplayGainVorbis(rgi,
(const char *)comments[i].entry))
found = true;
return found;
}
MixRampInfo
flac_parse_mixramp(const FLAC__StreamMetadata_VorbisComment &vc)
{
MixRampInfo mix_ramp;
const auto *comments = vc.comments;
for (FLAC__uint32 i = 0, n = vc.num_comments; i < n; ++i)
ParseMixRampVorbis(mix_ramp,
(const char *)comments[i].entry);
return mix_ramp;
}
/**
* Checks if the specified name matches the entry's name, and if yes,
* returns the comment value;
*/
static const char *
flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
const char *name) noexcept
{
return vorbis_comment_value((const char *)entry->entry, name);
}
/**
* 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, TagType tag_type,
TagHandler &handler) noexcept
{
const char *value = flac_comment_value(entry, name);
if (value != nullptr) {
handler.OnTag(tag_type, value);
return true;
}
return false;
}
static void
flac_scan_comment(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
TagHandler &handler) noexcept
{
if (handler.WantPair()) {
const char *comment = (const char *)entry->entry;
const DivideString split(comment, '=');
if (split.IsDefined() && !split.empty())
handler.OnPair(split.GetFirst(), split.GetSecond());
}
for (const struct tag_table *i = xiph_tags; i->name != nullptr; ++i)
if (flac_copy_comment(entry, i->name, i->type, handler))
return;
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (flac_copy_comment(entry,
tag_item_names[i], (TagType)i,
handler))
return;
}
static void
flac_scan_comments(const FLAC__StreamMetadata_VorbisComment *comment,
TagHandler &handler) noexcept
{
for (unsigned i = 0; i < comment->num_comments; ++i)
flac_scan_comment(&comment->comments[i],
handler);
}
gcc_pure
static inline SongTime
flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info) noexcept
{
assert(stream_info->sample_rate > 0);
return SongTime::FromScale<uint64_t>(stream_info->total_samples,
stream_info->sample_rate);
}
void
flac_scan_metadata(const FLAC__StreamMetadata *block,
TagHandler &handler) noexcept
{
switch (block->type) {
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
flac_scan_comments(&block->data.vorbis_comment,
handler);
break;
case FLAC__METADATA_TYPE_STREAMINFO:
if (block->data.stream_info.sample_rate > 0)
handler.OnDuration(flac_duration(&block->data.stream_info));
break;
default:
break;
}
}
Tag
flac_vorbis_comments_to_tag(const FLAC__StreamMetadata_VorbisComment *comment)
{
TagBuilder tag_builder;
AddTagHandler h(tag_builder);
flac_scan_comments(comment, h);
return tag_builder.Commit();
}
void
FlacMetadataChain::Scan(TagHandler &handler) noexcept
{
FLACMetadataIterator iterator(*this);
do {
FLAC__StreamMetadata *block = iterator.GetBlock();
if (block == nullptr)
break;
flac_scan_metadata(block, handler);
} while (iterator.Next());
}
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