78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* Copyright (C) 2003-2011 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 PCM_BUFFER_H
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#define PCM_BUFFER_H
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#include "check.h"
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#include <glib.h>
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#include <assert.h>
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/**
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* Manager for a temporary buffer which grows as needed. We could
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* allocate a new buffer every time pcm_convert() is called, but that
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* would put too much stress on the allocator.
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*/
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struct pcm_buffer {
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void *buffer;
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size_t size;
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};
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/**
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* Initialize the buffer, but don't allocate anything yet.
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*/
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static inline void
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pcm_buffer_init(struct pcm_buffer *buffer)
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{
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assert(buffer != NULL);
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buffer->buffer = NULL;
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buffer->size = 0;
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}
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/**
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* Free resources. This function may be called more than once.
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*/
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static inline void
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pcm_buffer_deinit(struct pcm_buffer *buffer)
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{
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assert(buffer != NULL);
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g_free(buffer->buffer);
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buffer->buffer = NULL;
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}
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/**
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* Get the buffer, and guarantee a minimum size. This buffer becomes
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* invalid with the next pcm_buffer_get() call.
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*
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* This function will never return NULL, even if size is zero, because
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* the PCM library uses the NULL return value to signal "error". An
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* empty destination buffer is not always an error.
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*/
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G_GNUC_MALLOC
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void *
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pcm_buffer_get(struct pcm_buffer *buffer, size_t size);
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#endif
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