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/*
* Copyright (C) 2003-2014 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 "XiphTags.hxx"
#include "MixRampInfo.hxx"
#include "tag/TagHandler.hxx"
#include "tag/TagTable.hxx"
#include "tag/TagBuilder.hxx"
#include "tag/Tag.hxx"
#include "ReplayGainInfo.hxx"
#include "util/ASCII.hxx"
#include "util/SplitString.hxx"
#include <string.h>
static const char *
vorbis_comment_value(const FLAC__StreamMetadata *block,
const char *name)
{
int offset =
FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
name);
if (offset < 0)
return nullptr;
size_t name_length = strlen(name);
const FLAC__StreamMetadata_VorbisComment_Entry &vc =
block->data.vorbis_comment.comments[offset];
const char *comment = (const char *)vc.entry;
/* 1 is for '=' */
return comment + name_length + 1;
}
static bool
flac_find_float_comment(const FLAC__StreamMetadata *block,
const char *cmnt, float *fl)
{
const char *value = vorbis_comment_value(block, cmnt);
if (value == nullptr)
return false;
*fl = (float)atof(value);
return true;
}
bool
flac_parse_replay_gain(ReplayGainInfo &rgi,
const FLAC__StreamMetadata *block)
{
rgi.Clear();
bool found = false;
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;
}
gcc_pure
static std::string
flac_find_string_comment(const FLAC__StreamMetadata *block, const char *cmnt)
{
const char *value = vorbis_comment_value(block, cmnt);
if (value == nullptr)
return std::string();
return std::string(value);
}
MixRampInfo
flac_parse_mixramp(const FLAC__StreamMetadata *block)
{
MixRampInfo mix_ramp;
mix_ramp.SetStart(flac_find_string_comment(block, "mixramp_start"));
mix_ramp.SetEnd(flac_find_string_comment(block, "mixramp_end"));
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)
{
size_t name_length = strlen(name);
const char *comment = (const char*)entry->entry;
if (!StringEqualsCaseASCII(comment, name, name_length))
return nullptr;
if (comment[name_length] == '=') {
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, TagType tag_type,
const struct tag_handler *handler, void *handler_ctx)
{
const char *value = flac_comment_value(entry, name);
if (value != nullptr) {
tag_handler_invoke_tag(handler, handler_ctx, tag_type, value);
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) {
const char *comment = (const char *)entry->entry;
const SplitString split(comment, '=');
if (split.IsDefined() && !split.IsEmpty())
tag_handler_invoke_pair(handler, handler_ctx,
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, handler_ctx))
return;
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (flac_copy_comment(entry,
tag_item_names[i], (TagType)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);
}
gcc_pure
static inline SongTime
flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info)
{
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,
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;
}
}
Tag
flac_vorbis_comments_to_tag(const FLAC__StreamMetadata_VorbisComment *comment)
{
TagBuilder tag_builder;
flac_scan_comments(comment, &add_tag_handler, &tag_builder);
return tag_builder.Commit();
}
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());
}
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