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-rw-r--r--src/decoder/plugins/FlacMetadata.cxx223
1 files changed, 223 insertions, 0 deletions
diff --git a/src/decoder/plugins/FlacMetadata.cxx b/src/decoder/plugins/FlacMetadata.cxx
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+++ b/src/decoder/plugins/FlacMetadata.cxx
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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);
+}
+
+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());
+}