125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/*
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* Copyright (C) 2003-2009 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_CHUNK_H
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#define MPD_CHUNK_H
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#ifndef NDEBUG
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#include "audio_format.h"
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#endif
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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enum {
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CHUNK_SIZE = 4096,
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};
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struct audio_format;
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/**
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* A chunk of music data. Its format is defined by the
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* music_pipe_append() caller.
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*/
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struct music_chunk {
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/** the next chunk in a linked list */
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struct music_chunk *next;
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/** number of bytes stored in this chunk */
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uint16_t length;
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/** current bit rate of the source file */
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uint16_t bit_rate;
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/** the time stamp within the song */
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float times;
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/**
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* An optional tag associated with this chunk (and the
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* following chunks); appears at song boundaries. The tag
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* object is owned by this chunk, and must be freed when this
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* chunk is deinitialized in music_chunk_free()
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*/
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struct tag *tag;
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/** the data (probably PCM) */
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char data[CHUNK_SIZE];
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#ifndef NDEBUG
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struct audio_format audio_format;
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#endif
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};
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void
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music_chunk_init(struct music_chunk *chunk);
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void
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music_chunk_free(struct music_chunk *chunk);
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static inline bool
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music_chunk_is_empty(const struct music_chunk *chunk)
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{
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return chunk->length == 0 && chunk->tag == NULL;
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}
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#ifndef NDEBUG
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/**
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* Checks if the audio format if the chunk is equal to the specified
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* audio_format.
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*/
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bool
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music_chunk_check_format(const struct music_chunk *chunk,
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const struct audio_format *audio_format);
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#endif
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/**
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* Prepares appending to the music chunk. Returns a buffer where you
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* may write into. After you are finished, call music_chunk_expand().
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*
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* @param chunk the music_chunk object
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* @param audio_format the audio format for the appended data; must
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* stay the same for the life cycle of this chunk
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* @param data_time the time within the song
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* @param bit_rate the current bit rate of the source file
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* @param max_length_r the maximum write length is returned here
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* @return a writable buffer, or NULL if the chunk is full
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*/
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void *
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music_chunk_write(struct music_chunk *chunk,
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const struct audio_format *audio_format,
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float data_time, uint16_t bit_rate,
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size_t *max_length_r);
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/**
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* Increases the length of the chunk after the caller has written to
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* the buffer returned by music_chunk_write().
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*
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* @param chunk the music_chunk object
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* @param audio_format the audio format for the appended data; must
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* stay the same for the life cycle of this chunk
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* @param length the number of bytes which were appended
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* @return true if the chunk is full
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*/
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bool
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music_chunk_expand(struct music_chunk *chunk,
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const struct audio_format *audio_format, size_t length);
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#endif
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