add U16view, I16view, U32view, I32view classes

res/modules/internal/audio_input.lua

@@ -19,10 +19,10 @@ function audio.fetch_input(token, size)
     size = size or MAX_FETCH
     if audio_input_tokens_store[token] then
         if #total_fetch >= size then
-            return total_fetch:sub(1, size)
+            return total_fetch:slice(1, size)
         end
         total_fetch:append(_audio_fetch_input(size - #total_fetch))
-        return total_fetch:sub()
+        return total_fetch:slice()
     end
     error("access denied")
 end

res/modules/internal/bytearray.lua

@@ -121,7 +121,7 @@ local function get_capacity(self)
     return self.capacity
 end
 
-local function sub(self, offset, length)
+local function slice(self, offset, length)
     offset = offset or 1
     length = length or (self.size - offset + 1)
     if offset < 1 or offset > self.size then
@@ -131,6 +131,9 @@ local function sub(self, offset, length)
         length = self.size - offset + 1
     end
     local buffer = malloc(length)
+    if not buffer then
+        error("malloc(" .. length .. ") returned NULL")
+    end
     FFI.copy(buffer, self.bytes + (offset - 1), length)
     return bytearray_type(buffer, length, length)
 end
@@ -143,7 +146,7 @@ local bytearray_methods = {
     clear=clear,
     reserve=reserve,
     get_capacity=get_capacity,
-    sub=sub,
+    slice=slice,
 }
 
 local bytearray_mt = {
@@ -227,7 +230,59 @@ local function FFIBytearray_as_string(bytes)
     end
 end
 
+local function create_FFIview_class(name, typename, typesize)
+    local FFIU16view_mt = {
+        __index = function(self, key)
+            if key <= 0 or key > self.size then
+                return
+            end
+            return self.ptr[key - 1]
+        end,
+        __newindex = function(self, key, value)
+            if key == self.size + 1 then
+                return append(self, value)
+            elseif key <= 0 or key > self.size then
+                return
+            end
+            self.ptr[key - 1] = value
+        end,
+        __len = function(self)
+            return self.size
+        end,
+        __tostring = function(self)
+            return string.format(name .. "[%s]{...}", tonumber(self.size))
+        end,
+        __ipairs = function(self)
+            local i = 0
+            return function()
+                i = i + 1
+                if i <= self.size then
+                    return i, self.ptr[i - 1]
+                end
+            end
+        end
+    }
+    return function (bytes)
+        local ptr = FFI.cast(typename .. "*", bytes.bytes)
+        local x = setmetatable({
+            bytes=bytes,
+            ptr=ptr,
+            size=math.floor(bytes.size / typesize),
+        }, FFIU16view_mt)
+        return x
+    end
+end
+
+local FFII16view = create_FFIview_class("FFII16view", "int16_t", 2)
+local FFIU16view = create_FFIview_class("FFIU16view", "uint16_t", 2)
+local FFII32view = create_FFIview_class("FFII32view", "int32_t", 4)
+local FFIU32view = create_FFIview_class("FFIU32view", "uint32_t", 4)
+
 return {
     FFIBytearray = setmetatable(FFIBytearray, FFIBytearray),
-    FFIBytearray_as_string = FFIBytearray_as_string
+    FFIBytearray_as_string = FFIBytearray_as_string,
+    FFIU16view = FFIU16view,
+    FFII16view = FFII16view,
+    FFIU32view = FFIU32view,
+    FFII32view = FFII32view,
 }