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/* Copyright (C) 2007 Jean-Marc Valin
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This is a very simple ring buffer implementation. It is not thread-safe
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so you need to do your own locking.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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#include "os_support.h"
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#include <speex/speex_buffer.h>
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EXPORT SpeexBuffer *speex_buffer_init(int size)
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SpeexBuffer *st = speex_alloc(sizeof(SpeexBuffer));
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st->data = speex_alloc(size);
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EXPORT void speex_buffer_destroy(SpeexBuffer *st)
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EXPORT int speex_buffer_write(SpeexBuffer *st, void *_data, int len)
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end = st->write_ptr + len;
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SPEEX_COPY(st->data + st->write_ptr, data, end1 - st->write_ptr);
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SPEEX_COPY(st->data, data+end1 - st->write_ptr, end);
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if (st->available > st->size)
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st->available = st->size;
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st->read_ptr = st->write_ptr;
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if (st->write_ptr > st->size)
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st->write_ptr -= st->size;
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EXPORT int speex_buffer_writezeros(SpeexBuffer *st, int len)
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/* This is almost the same as for speex_buffer_write() but using
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SPEEX_MEMSET() instead of SPEEX_COPY(). Update accordingly. */
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end = st->write_ptr + len;
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SPEEX_MEMSET(st->data + st->write_ptr, 0, end1 - st->write_ptr);
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SPEEX_MEMSET(st->data, 0, end);
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st->available += len;
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if (st->available > st->size)
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st->available = st->size;
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st->read_ptr = st->write_ptr;
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st->write_ptr += len;
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if (st->write_ptr > st->size)
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st->write_ptr -= st->size;
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EXPORT int speex_buffer_read(SpeexBuffer *st, void *_data, int len)
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if (len > st->available)
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SPEEX_MEMSET(data+st->available, 0, st->size-st->available);
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end = st->read_ptr + len;
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SPEEX_COPY(data, st->data + st->read_ptr, end1 - st->read_ptr);
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SPEEX_COPY(data+end1 - st->read_ptr, st->data, end);
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st->available -= len;
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if (st->read_ptr > st->size)
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st->read_ptr -= st->size;
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EXPORT int speex_buffer_get_available(SpeexBuffer *st)
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return st->available;
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EXPORT int speex_buffer_resize(SpeexBuffer *st, int len)
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int old_len = st->size;
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st->data = speex_realloc(st->data, len);
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/* FIXME: move data/pointers properly for growing the buffer */
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/* FIXME: move data/pointers properly for shrinking the buffer */
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st->data = speex_realloc(st->data, len);