Add speex to trunk/deps/third_party/....

speex/libspeex/buffer.c

+/* 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, 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;
+}
+
+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;
+}