diff --git a/mpp/mpi.cpp b/mpp/mpi.cpp
index 9ee20c39..9b45d932 100644
--- a/mpp/mpi.cpp
+++ b/mpp/mpi.cpp
@@ -116,10 +116,24 @@ static MPP_RET mpi_control(MppCtx ctx, MPI_CMD cmd, MppParam param)
     return MPP_OK;
 }
 
+static MppApi mpp_api = {
+    sizeof(mpp_api),
+    1,
+    mpi_init,
+    mpi_decode,
+    mpi_encode,
+    mpi_decode_put_packet,
+    mpi_decode_get_frame,
+    mpi_encode_put_frame,
+    mpi_encode_get_packet,
+    mpi_flush,
+    mpi_control,
+    {0},
+};
+
 MPP_RET mpp_init(MppCtx *ctx, MppApi **mpi)
 {
     MpiImpl *p;
-    MppApi  *api;
     MPI_FUNCTION_ENTER();
 
     if (NULL == ctx || NULL == mpi) {
@@ -134,30 +148,11 @@ MPP_RET mpp_init(MppCtx *ctx, MppApi **mpi)
         return MPP_ERR_MALLOC;
     }
 
-    api = mpp_malloc(MppApi, 1);
-    if (NULL == api) {
-        mpp_err("mpp_init failed to allocate mpi\n");
-        mpp_free(p);
-        return MPP_ERR_MALLOC;
-    }
-
-    memset(p,   0, sizeof(*p));
-    memset(api, 0, sizeof(*api));
-    api->size               = sizeof(*api);
-    api->version            = 1;
-    api->init               = mpi_init;
-    api->decode             = mpi_decode;
-    api->encode             = mpi_encode;
-    api->decode_put_packet  = mpi_decode_put_packet;
-    api->decode_get_frame   = mpi_decode_get_frame;
-    api->encode_put_frame   = mpi_encode_put_frame;
-    api->encode_get_packet  = mpi_encode_get_packet;
-    api->flush              = mpi_flush;
-    api->control            = mpi_control;
-    p->api                  = api;
-    p->check                = p;
+    memset(p, 0, sizeof(*p));
+    p->api   = &mpp_api;
+    p->check = p;
     *ctx = p;
-    *mpi = api;
+    *mpi = p->api;
 
     get_mpi_debug();
 
@@ -182,8 +177,6 @@ MPP_RET mpp_deinit(MppCtx* ctx)
         return MPP_ERR_UNKNOW;
     }
 
-    if (p->api)
-        mpp_free(p->api);
     if (p)
         mpp_free(p);
     *ctx = NULL;
diff --git a/osal/mpp_allocator.cpp b/osal/mpp_allocator.cpp
index 7de59b30..ceb997ff 100644
--- a/osal/mpp_allocator.cpp
+++ b/osal/mpp_allocator.cpp
@@ -58,6 +58,13 @@ MPP_RET mpp_allocator_free(MppAllocator allocator, MppBufferData *data)
     return MPP_OK;
 }
 
+static MppAllocatorApi mpp_allocator_api = {
+    sizeof(mpp_allocator_api),
+    1,
+    mpp_allocator_alloc,
+    mpp_allocator_free,
+};
+
 MPP_RET mpp_alloctor_get(MppAllocator *allocator, MppAllocatorApi **api, MppBufferType type)
 {
     if (NULL == allocator || NULL == api || type >= MPP_BUFFER_TYPE_BUTT) {
@@ -72,21 +79,9 @@ MPP_RET mpp_alloctor_get(MppAllocator *allocator, MppAllocatorApi **api, MppBuff
         return MPP_ERR_NULL_PTR;
     }
 
-    MppAllocatorApi *papi = mpp_malloc(MppAllocatorApi, 1);
-    if (NULL == papi) {
-        mpp_err("mpp_alloctor_get failed to malloc api context\n");
-        mpp_free(palloc);
-        return MPP_ERR_NULL_PTR;
-    }
-
     palloc->alignment   = SZ_4K;
     os_allocator_open(&palloc->allocator, palloc->alignment, type);
-
-    papi->size      = sizeof(papi->size);
-    papi->version   = 1;
-    papi->alloc     = mpp_allocator_alloc;
-    papi->free      = mpp_allocator_free;
-    palloc->api     = papi;
+    palloc->api = &mpp_allocator_api;
 
     pthread_mutexattr_t attr;
     pthread_mutexattr_init(&attr);
@@ -95,7 +90,7 @@ MPP_RET mpp_alloctor_get(MppAllocator *allocator, MppAllocatorApi **api, MppBuff
     pthread_mutexattr_destroy(&attr);
 
     *allocator  = palloc;
-    *api        = papi;
+    *api        = &mpp_allocator_api;
 
     return MPP_OK;
 }
@@ -111,8 +106,6 @@ MPP_RET mpp_alloctor_put(MppAllocator *allocator)
     *allocator = NULL;
     os_allocator_close(p->allocator);
 
-    mpp_assert(p->api);
-    mpp_free(p->api);
     if (p)
         mpp_free(p);