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Diffstat (limited to 'src/libspeex/buffer.c')
| -rw-r--r-- | src/libspeex/buffer.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/libspeex/buffer.c b/src/libspeex/buffer.c new file mode 100644 index 0000000..e0761fd --- /dev/null +++ b/src/libspeex/buffer.c @@ -0,0 +1,176 @@ +/* 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; +}; + +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; +} + +void speex_buffer_destroy(SpeexBuffer *st) +{ + speex_free(st->data); + speex_free(st); +} + +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; +} + +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; +} + +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, st->size-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; +} + +int speex_buffer_get_available(SpeexBuffer *st) +{ + return st->available; +} + +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; +} |