diff --git a/inc/mpp_buffer.h b/inc/mpp_buffer.h
index 828ed8ee..4ad58646 100644
--- a/inc/mpp_buffer.h
+++ b/inc/mpp_buffer.h
@@ -211,6 +211,7 @@ MPP_RET mpp_buffer_read(MppBuffer buffer, size_t offset, void *data, size_t size
 MPP_RET mpp_buffer_write(MppBuffer buffer, size_t offset, void *data, size_t size);
 void   *mpp_buffer_get_ptr(MppBuffer buffer);
 int     mpp_buffer_get_fd(MppBuffer buffer);
+size_t  mpp_buffer_get_size(MppBuffer buffer);
 
 MPP_RET mpp_buffer_group_get(const char *tag, const char *caller, MppBufferMode mode, MppBufferGroup *group, MppBufferType type);
 MPP_RET mpp_buffer_group_put(MppBufferGroup group);
diff --git a/mpp/base/mpp_buffer.cpp b/mpp/base/mpp_buffer.cpp
index 56488b2a..1946eb75 100644
--- a/mpp/base/mpp_buffer.cpp
+++ b/mpp/base/mpp_buffer.cpp
@@ -132,7 +132,7 @@ MPP_RET mpp_buffer_write(MppBuffer buffer, size_t offset, void *data, size_t siz
 void *mpp_buffer_get_ptr(MppBuffer buffer)
 {
     if (NULL == buffer) {
-        mpp_err_f("invalid input: buffer %p\n", buffer);
+        mpp_err_f("invalid NULL input\n");
         return NULL;
     }
 
@@ -145,7 +145,7 @@ void *mpp_buffer_get_ptr(MppBuffer buffer)
 int mpp_buffer_get_fd(MppBuffer buffer)
 {
     if (NULL == buffer) {
-        mpp_err_f("invalid input: buffer %p\n", buffer);
+        mpp_err_f("invalid NULL input\n");
         return -1;
     }
 
@@ -159,6 +159,17 @@ int mpp_buffer_get_fd(MppBuffer buffer)
     return fd;
 }
 
+size_t mpp_buffer_get_size(MppBuffer buffer)
+{
+    if (NULL == buffer) {
+        mpp_err_f("invalid NULL input\n");
+        return -1;
+    }
+
+    MppBufferImpl *p = (MppBufferImpl*)buffer;
+    return p->info.size;
+}
+
 MPP_RET mpp_buffer_info_get(MppBuffer buffer, MppBufferInfo *info)
 {
     if (NULL == buffer || NULL == info) {