Added some commenting above functions

rtmp/rtmp.go

@@ -130,6 +130,7 @@ func (s *session) Write(data []byte) (int, error) {
 	return len(data), nil
 }
 
+// rtmpWrite writes data to the current rtmp connection encapsulated by r
 func rtmpWrite(r *C.RTMP, data []byte) int {
 	buf := sliceToPtr(data)
 	// TODO: port RTMPPacket
@@ -224,14 +225,19 @@ func rtmpWrite(r *C.RTMP, data []byte) int {
 	return size + s2
 }
 
+// indxPtr replicates C array indexing using an unsafe pointer
 func indxPtr(ptr unsafe.Pointer, inc int) byte {
 	return *(*byte)(incPtr(ptr,inc))
 }
 
+// sliceToPtr get's the address of the first data element and returns as unsafe
+// pointer
 func sliceToPtr(data []byte) unsafe.Pointer {
 	return unsafe.Pointer(&data[0])
 }
 
+// ptrToSlice returns a slice given unsafe pointer and size - no allocation and
+// copying is required - same data is used.
 func ptrToSlice(data unsafe.Pointer, size int) []byte {
 	var ret []byte
 	shDest := (*reflect.SliceHeader)(unsafe.Pointer(&ret))
@@ -241,6 +247,7 @@ func ptrToSlice(data unsafe.Pointer, size int) []byte {
 	return ret
 }
 
+// incPtr attempts to replicate C like pointer arithmatic functionality
 func incPtr(ptr unsafe.Pointer, inc int) unsafe.Pointer {
 	return unsafe.Pointer(uintptr(ptr) + uintptr(inc))
 }
@@ -290,7 +297,3 @@ func (e Err) Error() string {
 	}
 	return "rtmp: " + strconv.Itoa(int(e))
 }
-
-func byteSliceToCArr(buf []byte) *C.char {
-	return (*C.char)(unsafe.Pointer(&buf[0]))
-}