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