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-rw-r--r--src/decoder/FLACMetaData.cxx253
1 files changed, 253 insertions, 0 deletions
diff --git a/src/decoder/FLACMetaData.cxx b/src/decoder/FLACMetaData.cxx
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index 000000000..8273a230b
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+++ b/src/decoder/FLACMetaData.cxx
@@ -0,0 +1,253 @@
+/*
+ * Copyright (C) 2003-2012 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"
+
+extern "C" {
+#include "XiphTags.h"
+}
+
+#include "tag.h"
+#include "tag_handler.h"
+#include "tag_table.h"
+#include "replay_gain_info.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <stdlib.h>
+
+static bool
+flac_find_float_comment(const FLAC__StreamMetadata *block,
+ const char *cmnt, float *fl)
+{
+ int offset;
+ size_t pos;
+ int len;
+ unsigned char tmp, *p;
+
+ offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
+ cmnt);
+ if (offset < 0)
+ return false;
+
+ pos = strlen(cmnt) + 1; /* 1 is for '=' */
+ len = block->data.vorbis_comment.comments[offset].length - pos;
+ if (len <= 0)
+ return false;
+
+ p = &block->data.vorbis_comment.comments[offset].entry[pos];
+ tmp = p[len];
+ p[len] = '\0';
+ *fl = (float)atof((char *)p);
+ p[len] = tmp;
+
+ return true;
+}
+
+bool
+flac_parse_replay_gain(struct replay_gain_info *rgi,
+ const FLAC__StreamMetadata *block)
+{
+ bool found = false;
+
+ replay_gain_info_init(rgi);
+
+ 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;
+}
+
+static bool
+flac_find_string_comment(const FLAC__StreamMetadata *block,
+ const char *cmnt, char **str)
+{
+ int offset;
+ size_t pos;
+ int len;
+ const unsigned char *p;
+
+ *str = nullptr;
+ offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
+ cmnt);
+ if (offset < 0)
+ return false;
+
+ pos = strlen(cmnt) + 1; /* 1 is for '=' */
+ len = block->data.vorbis_comment.comments[offset].length - pos;
+ if (len <= 0)
+ return false;
+
+ p = &block->data.vorbis_comment.comments[offset].entry[pos];
+ *str = g_strndup((const char *)p, len);
+
+ return true;
+}
+
+bool
+flac_parse_mixramp(char **mixramp_start, char **mixramp_end,
+ const FLAC__StreamMetadata *block)
+{
+ bool found = false;
+
+ if (flac_find_string_comment(block, "mixramp_start", mixramp_start))
+ found = true;
+ if (flac_find_string_comment(block, "mixramp_end", mixramp_end))
+ found = true;
+
+ return found;
+}
+
+/**
+ * Checks if the specified name matches the entry's name, and if yes,
+ * returns the comment value (not null-temrinated).
+ */
+static const char *
+flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
+ const char *name, size_t *length_r)
+{
+ size_t name_length = strlen(name);
+ const char *comment = (const char*)entry->entry;
+
+ if (entry->length <= name_length ||
+ g_ascii_strncasecmp(comment, name, name_length) != 0)
+ return nullptr;
+
+ if (comment[name_length] == '=') {
+ *length_r = entry->length - name_length - 1;
+ 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, enum tag_type tag_type,
+ const struct tag_handler *handler, void *handler_ctx)
+{
+ const char *value;
+ size_t value_length;
+
+ value = flac_comment_value(entry, name, &value_length);
+ if (value != nullptr) {
+ char *p = g_strndup(value, value_length);
+ tag_handler_invoke_tag(handler, handler_ctx, tag_type, p);
+ g_free(p);
+ 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) {
+ char *name = g_strdup((const char*)entry->entry);
+ char *value = strchr(name, '=');
+
+ if (value != nullptr && value > name) {
+ *value++ = 0;
+ tag_handler_invoke_pair(handler, handler_ctx,
+ name, value);
+ }
+
+ g_free(name);
+ }
+
+ 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], (enum tag_type)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;
+ }
+}
+
+void
+flac_vorbis_comments_to_tag(struct tag *tag,
+ const FLAC__StreamMetadata_VorbisComment *comment)
+{
+ flac_scan_comments(comment, &add_tag_handler, tag);
+}
+
+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());
+}