---

mdf.c:

#define USE_DTCM_SPEEX_ALLOC
#ifdef USE_DTCM_SPEEX_ALLOC
// DTCM SPEEX ALLOCATE 80kb
#define SPEEX_DTCM_POOL_SIZE (80 * 1024)
__attribute__((section(".dtcm_bss"))) static uint8_t speex_dtcm_pool[SPEEX_DTCM_POOL_SIZE];
static size_t dtcm_ptr = 0;

static void *custom_speex_alloc_smart(size_t size)
{
   // Align 4 byte's (Cortex-M7)
   size = (size + 3) & ~3;

   if (dtcm_ptr + size <= SPEEX_DTCM_POOL_SIZE) {
        void *ptr = &speex_dtcm_pool[dtcm_ptr];
        dtcm_ptr += size;
        printf("\n================== SPEEX AEC MEMORY REPORT ==================\n");
        printf("DTCM Pool allocated:  %5d / %5d bytes (%d%% used)\n", dtcm_ptr, SPEEX_DTCM_POOL_SIZE, (dtcm_ptr * 100) / SPEEX_DTCM_POOL_SIZE);
        return ptr;
   }
   printf("AEC Warning: DTCM ! Falling back to system heap for %d bytes\n", size);
   extern void *k_malloc(size_t size); 
   return malloc(size); 
}
#undef speex_alloc
#define speex_alloc(size) custom_speex_alloc_smart(size)

static void custom_speex_free_smart(void *ptr)
{
   if (ptr == NULL) {
      return;
   }
   if ((uint8_t *)ptr >= speex_dtcm_pool && (uint8_t *)ptr < (speex_dtcm_pool + SPEEX_DTCM_POOL_SIZE))
   {
      return;
   }
   free(ptr);
}
#undef speex_free
#define speex_free(ptr) custom_speex_free_smart(ptr)
#endif

По примеру speex надо всё алоцирование памяти для webrtc перенести в DTCM