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/*
* 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>
#include <assert.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)
{
assert(buffer != NULL);
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)
{
assert(buffer != NULL);
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.
*
* This function will never return NULL, even if size is zero, because
* the PCM library uses the NULL return value to signal "error". An
* empty destination buffer is not always an error.
*/
G_GNUC_MALLOC
void *
pcm_buffer_get(struct pcm_buffer *buffer, size_t size);
#endif
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