5d73215a8d
Pass a callback table to scan_file() and scan_stream(), instead of returning a tag object.
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
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* Copyright (C) 2003-2012 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 "config.h"
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#include "vorbis_comments.h"
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#include "tag.h"
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#include "tag_table.h"
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#include "tag_handler.h"
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#include "replay_gain_info.h"
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#include <glib.h>
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#include <assert.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdlib.h>
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static const char *
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vorbis_comment_value(const char *comment, const char *needle)
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{
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size_t len = strlen(needle);
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if (g_ascii_strncasecmp(comment, needle, len) == 0 &&
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comment[len] == '=')
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return comment + len + 1;
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return NULL;
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}
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bool
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vorbis_comments_to_replay_gain(struct replay_gain_info *rgi, char **comments)
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{
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const char *temp;
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bool found = false;
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replay_gain_info_init(rgi);
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while (*comments) {
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if ((temp =
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vorbis_comment_value(*comments, "replaygain_track_gain"))) {
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rgi->tuples[REPLAY_GAIN_TRACK].gain = atof(temp);
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found = true;
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} else if ((temp = vorbis_comment_value(*comments,
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"replaygain_album_gain"))) {
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rgi->tuples[REPLAY_GAIN_ALBUM].gain = atof(temp);
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found = true;
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} else if ((temp = vorbis_comment_value(*comments,
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"replaygain_track_peak"))) {
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rgi->tuples[REPLAY_GAIN_TRACK].peak = atof(temp);
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found = true;
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} else if ((temp = vorbis_comment_value(*comments,
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"replaygain_album_peak"))) {
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rgi->tuples[REPLAY_GAIN_ALBUM].peak = atof(temp);
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found = true;
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}
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comments++;
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}
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return found;
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}
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/**
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* Check if the comment's name equals the passed name, and if so, copy
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* the comment value into the tag.
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*/
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static bool
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vorbis_copy_comment(const char *comment,
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const char *name, enum tag_type tag_type,
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const struct tag_handler *handler, void *handler_ctx)
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{
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const char *value;
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value = vorbis_comment_value(comment, name);
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if (value != NULL) {
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tag_handler_invoke_tag(handler, handler_ctx, tag_type, value);
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return true;
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}
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return false;
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}
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static const struct tag_table vorbis_tags[] = {
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{ "tracknumber", TAG_TRACK },
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{ "discnumber", TAG_DISC },
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{ "album artist", TAG_ALBUM_ARTIST },
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{ NULL, TAG_NUM_OF_ITEM_TYPES }
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};
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static void
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vorbis_scan_comment(const char *comment,
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const struct tag_handler *handler, void *handler_ctx)
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{
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for (const struct tag_table *i = vorbis_tags; i->name != NULL; ++i)
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if (vorbis_copy_comment(comment, i->name, i->type,
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handler, handler_ctx))
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return;
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for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
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if (vorbis_copy_comment(comment,
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tag_item_names[i], i,
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handler, handler_ctx))
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return;
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}
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void
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vorbis_comments_scan(char **comments,
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const struct tag_handler *handler, void *handler_ctx)
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{
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while (*comments)
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vorbis_scan_comment(*comments++,
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handler, handler_ctx);
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}
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struct tag *
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vorbis_comments_to_tag(char **comments)
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{
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struct tag *tag = tag_new();
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vorbis_comments_scan(comments, &add_tag_handler, tag);
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if (tag_is_empty(tag)) {
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tag_free(tag);
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tag = NULL;
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}
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return tag;
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}
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