MPD 0.17~git
src/chunk.h
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00001 /*
00002  * Copyright (C) 2003-2011 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