for bug #241, simplify the buffer, donot reset when chunk size change.

@@ -200,25 +200,6 @@ void SrsFastBuffer::set_merge_read(bool v, int max_buffer, IMergeReadHandler* ha
 }
 #endif
 
-void SrsFastBuffer::on_chunk_size(int32_t chunk_size)
-{
-    if (nb_buffer >= chunk_size) {
-        return;
-    }
-
-    // limit the max buffer.
-    int buffer_size = srs_min(chunk_size, SRS_MR_SOCKET_BUFFER);
-
-    if (buffer_size != nb_buffer) {
-        reset_buffer(buffer_size);
-    }
-}
-
-int SrsFastBuffer::buffer_size()
-{
-    return nb_buffer;
-}
-
 void SrsFastBuffer::reset_buffer(int size)
 {
     // remember the cap.

@@ -163,17 +163,6 @@ public:
     */
     virtual void set_merge_read(bool v, int max_buffer, IMergeReadHandler* handler);
 #endif
-public:
-    /**
-    * when chunk size changed, the buffer should change the buffer also.
-    * to keep the socket buffer size always greater than chunk size.
-    * @see https://github.com/winlinvip/simple-rtmp-server/issues/241
-    */
-    virtual void on_chunk_size(int32_t chunk_size);
-    /**
-    * get the size of socket buffer to read.
-    */
-    virtual int buffer_size();
 private:
     virtual void reset_buffer(int size);
 };

@@ -1708,11 +1708,8 @@ int SrsProtocol::on_recv_message(SrsMessage* msg)
                     SRS_CONSTS_RTMP_MAX_CHUNK_SIZE);
             }
 
-            int sock_buffer = in_buffer->buffer_size();
             in_chunk_size = pkt->chunk_size;
-            in_buffer->on_chunk_size(pkt->chunk_size);
-            srs_trace("input chunk size to %d, sock buf %d=>%d",
-                pkt->chunk_size, sock_buffer, in_buffer->buffer_size());
+            srs_trace("input chunk size to %d", pkt->chunk_size);
 
             break;
         }