/* * Copyright (C) 2003-2010 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef PCM_BUFFER_H #define PCM_BUFFER_H #include <glib.h> /** * Manager for a temporary buffer which grows as needed. We could * allocate a new buffer every time pcm_convert() is called, but that * would put too much stress on the allocator. */ struct pcm_buffer { void *buffer; size_t size; }; /** * Initialize the buffer, but don't allocate anything yet. */ static inline void pcm_buffer_init(struct pcm_buffer *buffer) { buffer->buffer = NULL; buffer->size = 0; } /** * Free resources. This function may be called more than once. */ static inline void pcm_buffer_deinit(struct pcm_buffer *buffer) { g_free(buffer->buffer); buffer->buffer = NULL; } /** * Get the buffer, and guarantee a minimum size. This buffer becomes * invalid with the next pcm_buffer_get() call. */ static inline void * pcm_buffer_get(struct pcm_buffer *buffer, size_t size) { if (buffer->size < size) { /* free the old buffer */ g_free(buffer->buffer); /* allocate a new buffer; align at 8 kB boundaries */ buffer->size = ((size - 1) | 0x1fff) + 1; buffer->buffer = g_malloc(buffer->size); } return buffer->buffer; } #endif