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Diffstat (limited to '')
| -rw-r--r-- | src/decoder/plugins/FlacMetadata.cxx | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/decoder/plugins/FlacMetadata.cxx b/src/decoder/plugins/FlacMetadata.cxx new file mode 100644 index 000000000..03e276dce --- /dev/null +++ b/src/decoder/plugins/FlacMetadata.cxx @@ -0,0 +1,179 @@ +/* + * 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 "tag/VorbisComment.hxx" +#include "tag/ReplayGain.hxx" +#include "tag/MixRamp.hxx" +#include "ReplayGainInfo.hxx" +#include "util/ASCII.hxx" +#include "util/SplitString.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) +{ + 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, + 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()); +} |