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/* Copyright (C) 2007 Psi Systems, Inc.
Author: Jean-Marc Valin
File: os_support_custom.h
Memory Allocation overrides to allow user control rather than C alloc/free.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- 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.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``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 FOUNDATION OR
CONTRIBUTORS 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 MANUAL_ALLOC
/* To avoid changing the Speex call model, this file relies on four static variables
The user main creates two linear buffers, and initializes spxGlobalHeap/ScratchPtr
to point to the start of the two buffers, and initializes spxGlobalHeap/ScratchEnd
to point to the first address following the last byte of the two buffers.
This mechanism allows, for example, data caching for multichannel applications,
where the Speex state is swapped from a large slow memory to a small fast memory
each time the codec runs.
Persistent data is allocated in spxGlobalHeap (instead of calloc), while scratch
data is allocated in spxGlobalScratch.
*/
extern char *spxGlobalHeapPtr, *spxGlobalHeapEnd;
extern char *spxGlobalScratchPtr, *spxGlobalScratchEnd;
/* Make sure that all structures are aligned to largest type */
#define BLOCK_MASK (sizeof(long double)-1)
extern inline void speex_warning(const char *str);
#define OVERRIDE_SPEEX_ALLOC
static inline void *speex_alloc (int size)
{
void *ptr;
ptr = (void *) (((int)spxGlobalHeapPtr + BLOCK_MASK) & ~BLOCK_MASK); //Start on 8 boundary
spxGlobalHeapPtr = (char *)((int)ptr + size); // Update pointer to next free location
if (spxGlobalHeapPtr > spxGlobalHeapEnd )
{
#ifdef VERBOSE_ALLOC
fprintf (stderr, "insufficient space for persistent alloc request %d bytes\n", size);
#endif
return 0;
}
#ifdef VERBOSE_ALLOC
fprintf (stderr, "Persist Allocated %d chars at %x, %d remaining\n", size, ptr, ((int)spxGlobalHeapEnd - (int)spxGlobalHeapPtr));
#endif
memset(ptr, 0, size);
return ptr;
}
#define OVERRIDE_SPEEX_ALLOC_SCRATCH
static inline void *speex_alloc_scratch (int size)
{
void *ptr;
ptr = (void *) (((int)spxGlobalScratchPtr + BLOCK_MASK) & ~BLOCK_MASK); //Start on 8 boundary
spxGlobalScratchPtr = (char *)((int)ptr + size); // Update pointer to next free location
if (spxGlobalScratchPtr > spxGlobalScratchEnd )
{
#ifdef VERBOSE_ALLOC
fprintf (stderr, "insufficient space for scratch alloc request %d bytes\n", size);
#endif
return 0;
}
#ifdef VERBOSE_ALLOC
fprintf (stderr, "Scratch Allocated %d chars at %x, %d remaining\n", size, ptr, ((int)spxGlobalScratchEnd - (int)spxGlobalScratchPtr));
#endif
memset(ptr, 0, size);
return ptr;
}
#define OVERRIDE_SPEEX_REALLOC
static inline void *speex_realloc (void *ptr, int size)
{
#ifdef VERBOSE_ALLOC
speex_warning("realloc attempted, not allowed");
#endif
return 0;
}
#define OVERRIDE_SPEEX_FREE
static inline void speex_free (void *ptr)
{
#ifdef VERBOSE_ALLOC
speex_warning("at speex_free");
#endif
}
#define OVERRIDE_SPEEX_FREE_SCRATCH
static inline void speex_free_scratch (void *ptr)
{
#ifdef VERBOSE_ALLOC
speex_warning("at speex_free_scratch");
#endif
}
#endif /* !MANUAL_ALLOC */
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