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# src/chunk.h

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    00001 /*
    00002  * Copyright (C) 2003-2010 The Music Player Daemon Project
    00003  * http://www.musicpd.org
    00004  *
    00005  * This program is free software; you can redistribute it and/or modify
    00006  * it under the terms of the GNU General Public License as published by
    00007  * the Free Software Foundation; either version 2 of the License, or
    00008  * (at your option) any later version.
    00009  *
    00010  * This program is distributed in the hope that it will be useful,
    00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013  * GNU General Public License for more details.
    00014  *
    00015  * You should have received a copy of the GNU General Public License along
    00016  * with this program; if not, write to the Free Software Foundation, Inc.,
    00017  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    00018  */
    00019
    00020 #ifndef MPD_CHUNK_H
    00021 #define MPD_CHUNK_H
    00022
    00023 #include "replay_gain_info.h"
    00024
    00025 #ifndef NDEBUG
    00026 #include "audio_format.h"
    00027 #endif
    00028
    00029 #include <stdbool.h>
    00030 #include <stdint.h>
    00031 #include <stddef.h>
    00032
    00033 enum {
    00034         CHUNK_SIZE = 4096,
    00035 };
    00036
    00037 struct audio_format;
    00038
    00043 struct music_chunk {
    00045         struct music_chunk *next;
    00046
    00051         struct music_chunk *other;
    00052
    00057         float mix_ratio;
    00058
    00060         uint16_t length;
    00061
    00063         uint16_t bit_rate;
    00064
    00066         float times;
    00067
    00074         struct tag *tag;
    00075
    00080         struct replay_gain_info replay_gain_info;
    00081
    00087         unsigned replay_gain_serial;
    00088
    00090         char data[CHUNK_SIZE];
    00091
    00092 #ifndef NDEBUG
    00093         struct audio_format audio_format;
    00094 #endif
    00095 };
    00096
    00097 void
    00098 music_chunk_init(struct music_chunk *chunk);
    00099
    00100 void
    00101 music_chunk_free(struct music_chunk *chunk);
    00102
    00103 static inline bool
    00104 music_chunk_is_empty(const struct music_chunk *chunk)
    00105 {
    00106         return chunk->length == 0 && chunk->tag == NULL;
    00107 }
    00108
    00109 #ifndef NDEBUG
    00110
    00114 bool
    00115 music_chunk_check_format(const struct music_chunk *chunk,
    00116                          const struct audio_format *audio_format);
    00117 #endif
    00118
    00131 void *
    00132 music_chunk_write(struct music_chunk *chunk,
    00133                   const struct audio_format *audio_format,
    00134                   float data_time, uint16_t bit_rate,
    00135                   size_t *max_length_r);
    00136
    00147 bool
    00148 music_chunk_expand(struct music_chunk *chunk,
    00149                    const struct audio_format *audio_format, size_t length);
    00150
    00151 #endif