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      1 /* Copyright (C) 2007 Psi Systems, Inc.
      2    Author:  Jean-Marc Valin
      3    File: os_support_custom.h
      4    Memory Allocation overrides to allow user control rather than C alloc/free.
      5 
      6    Redistribution and use in source and binary forms, with or without
      7    modification, are permitted provided that the following conditions
      8    are met:
      9 
     10    - Redistributions of source code must retain the above copyright
     11    notice, this list of conditions and the following disclaimer.
     12 
     13    - Redistributions in binary form must reproduce the above copyright
     14    notice, this list of conditions and the following disclaimer in the
     15    documentation and/or other materials provided with the distribution.
     16 
     17    - Neither the name of the Xiph.org Foundation nor the names of its
     18    contributors may be used to endorse or promote products derived from
     19    this software without specific prior written permission.
     20 
     21    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     22    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     23    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     24    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
     25    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     26    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     27    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     28    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     29    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     30    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     31    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32 */
     33 
     34 #ifdef MANUAL_ALLOC
     35 
     36 /* To avoid changing the Speex call model, this file relies on four static variables
     37    The user main creates two linear buffers, and initializes spxGlobalHeap/ScratchPtr
     38    to point to the start of the two buffers, and initializes spxGlobalHeap/ScratchEnd
     39    to point to the first address following the last byte of the two buffers.
     40 
     41    This mechanism allows, for example, data caching for multichannel applications,
     42    where the Speex state is swapped from a large slow memory to a small fast memory
     43    each time the codec runs.
     44 
     45    Persistent data is allocated in spxGlobalHeap (instead of calloc), while scratch
     46    data is allocated in spxGlobalScratch.
     47 */
     48 
     49 extern char *spxGlobalHeapPtr, *spxGlobalHeapEnd;
     50 extern char *spxGlobalScratchPtr, *spxGlobalScratchEnd;
     51 
     52 /* Make sure that all structures are aligned to largest type */
     53 #define BLOCK_MASK      (sizeof(long double)-1)
     54 extern inline void speex_warning(const char *str);
     55 
     56 #define OVERRIDE_SPEEX_ALLOC
     57 static inline void *speex_alloc (int size)
     58 {
     59     void *ptr;
     60 
     61     ptr = (void *) (((int)spxGlobalHeapPtr + BLOCK_MASK) & ~BLOCK_MASK);  //Start on 8 boundary
     62 
     63     spxGlobalHeapPtr = (char *)((int)ptr + size);	// Update pointer to next free location
     64 
     65     if (spxGlobalHeapPtr > spxGlobalHeapEnd )
     66     {
     67 #ifdef VERBOSE_ALLOC
     68 	    fprintf (stderr, "insufficient space for persistent alloc request %d bytes\n", size);
     69 #endif
     70        return 0;
     71     }
     72 
     73 #ifdef VERBOSE_ALLOC
     74     fprintf (stderr, "Persist Allocated %d chars at %x, %d remaining\n", size, ptr, ((int)spxGlobalHeapEnd - (int)spxGlobalHeapPtr));
     75 #endif
     76     memset(ptr, 0, size);
     77     return ptr;
     78 }
     79 
     80 #define OVERRIDE_SPEEX_ALLOC_SCRATCH
     81 static inline void *speex_alloc_scratch (int size)
     82 {
     83     void *ptr;
     84 
     85     ptr = (void *) (((int)spxGlobalScratchPtr + BLOCK_MASK) & ~BLOCK_MASK);  //Start on 8 boundary
     86 
     87     spxGlobalScratchPtr = (char *)((int)ptr + size);	// Update pointer to next free location
     88 
     89     if (spxGlobalScratchPtr > spxGlobalScratchEnd )
     90     {
     91 #ifdef VERBOSE_ALLOC
     92 	    fprintf (stderr, "insufficient space for scratch alloc request %d bytes\n", size);
     93 #endif
     94        return 0;
     95     }
     96 
     97 #ifdef VERBOSE_ALLOC
     98     fprintf (stderr, "Scratch Allocated %d chars at %x, %d remaining\n", size, ptr, ((int)spxGlobalScratchEnd - (int)spxGlobalScratchPtr));
     99 #endif
    100     memset(ptr, 0, size);
    101     return ptr;
    102 }
    103 
    104 #define OVERRIDE_SPEEX_REALLOC
    105 static inline void *speex_realloc (void *ptr, int size)
    106 {
    107 #ifdef VERBOSE_ALLOC
    108    speex_warning("realloc attempted, not allowed");
    109 #endif
    110    return 0;
    111 }
    112 
    113 #define OVERRIDE_SPEEX_FREE
    114 static inline void speex_free (void *ptr)
    115 {
    116 #ifdef VERBOSE_ALLOC
    117    speex_warning("at speex_free");
    118 #endif
    119 }
    120 #define OVERRIDE_SPEEX_FREE_SCRATCH
    121 static inline void speex_free_scratch (void *ptr)
    122 {
    123 #ifdef VERBOSE_ALLOC
    124    speex_warning("at speex_free_scratch");
    125 #endif
    126 }
    127 
    128 #endif    /* !MANUAL_ALLOC */
    129