148 lines
3.8 KiB
C++
148 lines
3.8 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "FlacStreamMetadata.hxx"
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#include "FlacAudioFormat.hxx"
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#include "ScanVorbisComment.hxx"
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#include "pcm/CheckAudioFormat.hxx"
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#include "tag/Handler.hxx"
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#include "tag/Builder.hxx"
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#include "tag/Tag.hxx"
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#include "tag/MixRampInfo.hxx"
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#include "tag/MixRampParser.hxx"
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#include "tag/ReplayGainInfo.hxx"
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#include "tag/ReplayGainParser.hxx"
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#include "util/StringView.hxx"
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#include <cassert>
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static StringView
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ToStringView(const FLAC__StreamMetadata_VorbisComment_Entry &entry) noexcept
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{
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return {(const char *)entry.entry, entry.length};
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}
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bool
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flac_parse_replay_gain(ReplayGainInfo &rgi,
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const FLAC__StreamMetadata_VorbisComment &vc)
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{
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rgi.Clear();
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bool found = false;
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const auto *comments = vc.comments;
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for (FLAC__uint32 i = 0, n = vc.num_comments; i < n; ++i)
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if (ParseReplayGainVorbis(rgi, ToStringView(comments[i])))
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found = true;
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return found;
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}
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MixRampInfo
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flac_parse_mixramp(const FLAC__StreamMetadata_VorbisComment &vc)
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{
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MixRampInfo mix_ramp;
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const auto *comments = vc.comments;
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for (FLAC__uint32 i = 0, n = vc.num_comments; i < n; ++i)
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ParseMixRampVorbis(mix_ramp, ToStringView(comments[i]));
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return mix_ramp;
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}
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static void
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flac_scan_comments(const FLAC__StreamMetadata_VorbisComment *comment,
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TagHandler &handler) noexcept
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{
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for (unsigned i = 0; i < comment->num_comments; ++i)
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ScanVorbisComment(ToStringView(comment->comments[i]), handler);
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}
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gcc_pure
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static inline SongTime
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flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info) noexcept
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{
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assert(stream_info->sample_rate > 0);
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return SongTime::FromScale<uint64_t>(stream_info->total_samples,
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stream_info->sample_rate);
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}
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static void
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Scan(const FLAC__StreamMetadata_StreamInfo &stream_info,
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TagHandler &handler) noexcept
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{
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if (stream_info.sample_rate > 0)
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handler.OnDuration(flac_duration(&stream_info));
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try {
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handler.OnAudioFormat(CheckAudioFormat(stream_info.sample_rate,
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FlacSampleFormat(stream_info.bits_per_sample),
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stream_info.channels));
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} catch (...) {
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}
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}
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static void
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Scan(const FLAC__StreamMetadata_Picture &picture, TagHandler &handler) noexcept
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{
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if (!handler.WantPicture())
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return;
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if (picture.mime_type != nullptr &&
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StringIsEqual(picture.mime_type, "-->"))
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/* this is a URL, not image data */
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return;
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handler.OnPicture(picture.mime_type,
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{picture.data, picture.data_length});
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}
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void
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flac_scan_metadata(const FLAC__StreamMetadata *block,
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TagHandler &handler) noexcept
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{
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switch (block->type) {
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case FLAC__METADATA_TYPE_VORBIS_COMMENT:
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flac_scan_comments(&block->data.vorbis_comment,
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handler);
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break;
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case FLAC__METADATA_TYPE_STREAMINFO:
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Scan(block->data.stream_info, handler);
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break;
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case FLAC__METADATA_TYPE_PICTURE:
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Scan(block->data.picture, handler);
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break;
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default:
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break;
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}
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}
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Tag
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flac_vorbis_comments_to_tag(const FLAC__StreamMetadata_VorbisComment *comment)
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{
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TagBuilder tag_builder;
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AddTagHandler h(tag_builder);
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flac_scan_comments(comment, h);
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return tag_builder.Commit();
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}
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