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# src/pcm_buffer.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 PCM_BUFFER_H
    00021 #define PCM_BUFFER_H
    00022
    00023 #include <glib.h>
    00024
    00030 struct pcm_buffer {
    00031         void *buffer;
    00032
    00033         size_t size;
    00034 };
    00035
    00039 static inline void
    00040 pcm_buffer_init(struct pcm_buffer *buffer)
    00041 {
    00042         buffer->buffer = NULL;
    00043         buffer->size = 0;
    00044 }
    00045
    00049 static inline void
    00050 pcm_buffer_deinit(struct pcm_buffer *buffer)
    00051 {
    00052         g_free(buffer->buffer);
    00053
    00054         buffer->buffer = NULL;
    00055 }
    00056
    00061 static inline void *
    00062 pcm_buffer_get(struct pcm_buffer *buffer, size_t size)
    00063 {
    00064         if (buffer->size < size) {
    00065                 /* free the old buffer */
    00066                 g_free(buffer->buffer);
    00067
    00068                 /* allocate a new buffer; align at 8 kB boundaries */
    00069                 buffer->size = ((size - 1) | 0x1fff) + 1;
    00070                 buffer->buffer = g_malloc(buffer->size);
    00071         }
    00072
    00073         return buffer->buffer;
    00074 }
    00075
    00076 #endif