77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
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/*
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* Copyright (C) 2003-2011 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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#ifndef MPD_TAG_HANDLER_H
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#define MPD_TAG_HANDLER_H
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#include "check.h"
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#include "tag.h"
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#include <assert.h>
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/**
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* A callback table for receiving metadata of a song.
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*/
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struct tag_handler {
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/**
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* Declare the duration of a song, in seconds. Do not call
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* this when the duration could not be determined, because
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* there is no magic value for "unknown duration".
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*/
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void (*duration)(unsigned seconds, void *ctx);
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/**
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* A tag has been read.
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*
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* @param the value of the tag; the pointer will become
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* invalid after returning
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*/
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void (*tag)(enum tag_type type, const char *value, void *ctx);
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};
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static inline void
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tag_handler_invoke_duration(const struct tag_handler *handler, void *ctx,
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unsigned seconds)
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{
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assert(handler != NULL);
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if (handler->duration != NULL)
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handler->duration(seconds, ctx);
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}
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static inline void
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tag_handler_invoke_tag(const struct tag_handler *handler, void *ctx,
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enum tag_type type, const char *value)
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{
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assert(handler != NULL);
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assert((unsigned)type < TAG_NUM_OF_ITEM_TYPES);
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assert(value != NULL);
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if (handler->tag != NULL)
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handler->tag(type, value, ctx);
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}
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/**
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* This #tag_handler implementation adds tag values to a #tag object
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* (casted from the context pointer).
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*/
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extern const struct tag_handler add_tag_handler;
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#endif
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