Add VideoFrameBufferInit.transfer

w3c · May 18, 2023 · 050ec9d · 050ec9d
1 parent 3a96dbd
commit 050ec9d
Showing 1 changed file with 44 additions and 29 deletions.
diff --git a/index.src.html b/index.src.html
@@ -3277,6 +3277,8 @@
   [EnforceRange] unsigned long displayHeight;
 
   VideoColorSpaceInit colorSpace;
+
+  sequence<ArrayBuffer> transfer = [];
 };
 
 dictionary VideoFrameMetadata {
@@ -3415,29 +3417,39 @@
   VideoFrame(data, init)
 </dfn>
 1. If |init| is not a [=valid VideoFrameBufferInit=], throw a {{TypeError}}.
-2. Let |defaultRect| be «[ "x:" → `0`, "y" → `0`,
+1. Let |defaultRect| be «[ "x:" → `0`, "y" → `0`,
     "width" → |init|.{{VideoFrameBufferInit/codedWidth}}, "height" →
         |init|.{{VideoFrameBufferInit/codedWidth}} ]».
-3. Let |overrideRect| be `undefined`.
-4. If |init|.{{VideoFrameBufferInit/visibleRect}} [=map/exists=], assign its
+1. Let |overrideRect| be `undefined`.
+1. If |init|.{{VideoFrameBufferInit/visibleRect}} [=map/exists=], assign its
     value to |overrideRect|.
-4. Let |parsedRect| be the result of running the [=VideoFrame/Parse Visible
+1. Let |parsedRect| be the result of running the [=VideoFrame/Parse Visible
         Rect=] algorithm with |defaultRect|, |overrideRect|,
         |init|.{{VideoFrameBufferInit/codedWidth}},
         |init|.{{VideoFrameBufferInit/codedHeight}}, and
         |init|.{{VideoFrameBufferInit/format}}.
-5. If |parsedRect| is an exception, return |parsedRect|.
-6. Let |optLayout| be `undefined`.
-7. If |options|.{{VideoFrameBufferInit/layout}} [=map/exists=], assign its value
+1. If |parsedRect| is an exception, return |parsedRect|.
+1. Let |optLayout| be `undefined`.
+1. If |options|.{{VideoFrameBufferInit/layout}} [=map/exists=], assign its value
     to |optLayout|.
-8. Let |combinedLayout| be the result of running the [=VideoFrame/Compute
+1. Let |combinedLayout| be the result of running the [=VideoFrame/Compute
     Layout and Allocation Size=] algorithm with |parsedRect|,
     |init|.{{VideoFrameBufferInit/format}}, and |optLayout|.
-9. If |combinedLayout| is an exception, throw |combinedLayout|.
-10. If `data.byteLength` is less than |combinedLayout|’s
+1. If |combinedLayout| is an exception, throw |combinedLayout|.
+1. If `data.byteLength` is less than |combinedLayout|’s
     [=combined buffer layout/allocationSize=], throw a {{TypeError}}.
-11. Let |resource| be a new [=media resource=] containing a copy of |data|. Use
-        {{VideoFrameBufferInit/visibleRect}} and {{VideoFrameBufferInit/layout}}
+1. For each |transferable| in |init|.{{VideoFrameBufferInit/transfer}}:
+    1. If {{platform object/[[Detached]]}} internal slot is `true`,
+        then throw a {{DataCloneError}} {{DOMException}}.
+1. If |init|.{{VideoFrameBufferInit/transfer}} contains an ArrayBuffer referenced
+    by |data|:
+    1. Let |resource| be a new [=media resource=] referencing pixels in |data|
+        without a copy.
+        Use {{VideoFrameBufferInit/visibleRect}} and {{VideoFrameBufferInit/layout}}
+        to determine where in |data| the pixels for each plane reside.
+1. Otherwise:
+    1. Let |resource| be a new [=media resource=] containing a copy of |data|.
+        Use {{VideoFrameBufferInit/visibleRect}} and {{VideoFrameBufferInit/layout}}
         to determine where in |data| the pixels for each plane reside.
 
         The User Agent <em class="rfc2119">MAY</em> choose to allocate
@@ -3449,55 +3461,58 @@
         reposition the visible rectangle within |resource|. The final position
         will be reflected by {{VideoFrame/visibleRect}}.
 
-12. Let |resourceCodedWidth| be the coded width of |resource|.
-13. Let |resourceCodedHeight| be the coded height of |resource|.
-14. Let |resourceVisibleLeft| be the left offset for the visible rectangle of
+1. For each |transferable| in |init|.{{VideoFrameBufferInit/transfer}}:
+    1. Perform [DetachArrayBuffer](https://tc39.es/ecma262/#sec-detacharraybuffer)
+        on |transferable|
+1. Let |resourceCodedWidth| be the coded width of |resource|.
+1. Let |resourceCodedHeight| be the coded height of |resource|.
+1. Let |resourceVisibleLeft| be the left offset for the visible rectangle of
     |resource|.
-15. Let |resourceVisibleTop| be the top offset for the visible rectangle of
+1. Let |resourceVisibleTop| be the top offset for the visible rectangle of
     |resource|.
 
     ISSUE: The spec <em class="rfc2119">SHOULD</em> provide definitions (and
       possibly diagrams) for coded size, visible rectangle, and display size.
       See [#166](https://github.com/w3c/webcodecs/issues/166).
 
-16. Let |frame| be a new {{VideoFrame}} object initialized as follows:
+1. Let |frame| be a new {{VideoFrame}} object initialized as follows:
     1. Assign |resourceCodedWidth|, |resourceCodedHeight|,
         |resourceVisibleLeft|, and |resourceVisibleTop| to
         {{VideoFrame/[[coded width]]}}, {{VideoFrame/[[coded height]]}},
         {{VideoFrame/[[visible left]]}}, and {{VideoFrame/[[visible top]]}}
         respectively.
-    2. If |init|.{{VideoFrameBufferInit/visibleRect}} [=map/exists=]:
+    1. If |init|.{{VideoFrameBufferInit/visibleRect}} [=map/exists=]:
         1. Let |truncatedVisibleWidth| be the value of
             {{VideoFrameBufferInit/visibleRect}}.{{DOMRectInit/width}} after
             truncating.
         1. Assign |truncatedVisibleWidth| to {{VideoFrame/[[visible width]]}}.
-        3. Let |truncatedVisibleHeight| be the value of
+        1. Let |truncatedVisibleHeight| be the value of
             {{VideoFrameBufferInit/visibleRect}}.{{DOMRectInit/height}} after
             truncating.
-        2. Assign |truncatedVisibleHeight| to {{VideoFrame/[[visible height]]}}.
-    3. Otherwise:
+        1. Assign |truncatedVisibleHeight| to {{VideoFrame/[[visible height]]}}.
+    1. Otherwise:
         1. Assign {{VideoFrame/[[coded width]]}} to
             {{VideoFrame/[[visible width]]}}.
         2. Assign {{VideoFrame/[[coded height]]}} to
             {{VideoFrame/[[visible height]]}}.
-    4. If |init|.{{VideoFrameBufferInit/displayWidth}} [=map/exists=], assign
+    1. If |init|.{{VideoFrameBufferInit/displayWidth}} [=map/exists=], assign
         it to {{VideoFrame/[[display width]]}}. Otherwise, assign
         {{VideoFrame/[[visible width]]}} to {{VideoFrame/[[display width]]}}.
-    5. If |init|.{{VideoFrameBufferInit/displayHeight}} [=map/exists=], assign
+    1. If |init|.{{VideoFrameBufferInit/displayHeight}} [=map/exists=], assign
         it to {{VideoFrame/[[display height]]}}. Otherwise, assign
         {{VideoFrame/[[visible height]]}} to {{VideoFrame/[[display height]]}}.
-    6. Assign |init|'s {{VideoFrameBufferInit/timestamp}} and
+    1. Assign |init|'s {{VideoFrameBufferInit/timestamp}} and
         {{VideoFrameBufferInit/duration}} to {{VideoFrame/[[timestamp]]}} and
         {{VideoFrame/[[duration]]}} respectively.
-    7. Let |colorSpace| be `undefined`.
-    8. If |init|.{{VideoFrameBufferInit/colorSpace}} [=map/exists=], assign its
+    1. Let |colorSpace| be `undefined`.
+    1. If |init|.{{VideoFrameBufferInit/colorSpace}} [=map/exists=], assign its
         value to |colorSpace|.
-    9. Assign the result of running the [=VideoFrame/Pick Color Space=]
+    1. Assign the result of running the [=VideoFrame/Pick Color Space=]
         algorithm, with |colorSpace| and {{VideoFrame/[[format]]}}, to
         {{VideoFrame/[[color space]]}}.
-    10. Assign the result of calling [=Copy VideoFrame metadata=]
+    1. Assign the result of calling [=Copy VideoFrame metadata=]
         with |init|'s {{VideoFrameInit/metadata}} to |frame|.{{VideoFrame/[[metadata]]}}.
-17. Return |frame|.
+1. Return |frame|.
 
 ### Attributes ###{#videoframe-attributes}
 : <dfn attribute for=VideoFrame>format</dfn>