What would be necessary to update SourceBuffer::appendStream to current stream definition and implementation? IIUC, the "maxSize" parameter needed something like BYOB readers (see https://github.com/w3c/media-source/issues/14#issuecomment-203953825). Is that still the case, and if so, I don't see BYOB readers implemented in Chrome yet (any ETA?)

To your more immediate question, since appendStream isn't in MSE v1 spec (and in Chrome is legacy-Stream-based and currently behind ExperimentalStream flag), we could drop that from Chrome for now and add it back later if it becomes part of some MSE vNext incubation.

Thank you! Then I will delete the interface.

BYOB ReadableStream has not been implemented yet. +tyoshino@ as he is working on the feature.

wolenetz: Sorry for not updating you for long time. the BYOB ReadableStream has been standardized and is stable enough for implementation. We prioritized some other works in Q2-3. I think we can move forward in 2017 to add the byte stream construction option to Chrome.

@#2 & #3 SGTM. Thanks

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5862e0528606bfd42e997aeef1b6b82db5f26313

commit 5862e0528606bfd42e997aeef1b6b82db5f26313
Author: yhirano <yhirano@chromium.org>
Date: Tue Nov 08 04:00:35 2016

Remove "legacy" experimental stream support

This CL removes the legacy experimental Stream interface which was replaced
by ReadableStream.

appendStream was removed from the MediaSourceExtension spec v1.
https://github.com/w3c/media-source/issues/14#issuecomment-238363951

BUG= 659965 

Review-Url: https://codereview.chromium.org/2467233002
Cr-Commit-Position: refs/heads/master@{#430513}

[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/LayoutTests/TestExpectations
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/LayoutTests/fast/xmlhttprequest/xmlhttprequest-set-responsetype-expected.txt
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/LayoutTests/fast/xmlhttprequest/xmlhttprequest-set-responsetype.html
[delete] https://crrev.com/03e765142cd8c54c3c082a1924f1c13b4ba18e59/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-append-legacystream.html
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-util.js
[delete] https://crrev.com/03e765142cd8c54c3c082a1924f1c13b4ba18e59/third_party/WebKit/LayoutTests/http/tests/media/media-source/stream_memory_tests/mediasource-appendstream-quota-exceeded-1mb-buffers.html
[delete] https://crrev.com/03e765142cd8c54c3c082a1924f1c13b4ba18e59/third_party/WebKit/LayoutTests/http/tests/media/media-source/stream_memory_tests/mediasource-appendstream-quota-exceeded-default-buffers.html
[delete] https://crrev.com/03e765142cd8c54c3c082a1924f1c13b4ba18e59/third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/response-legacystream-abort.html
[delete] https://crrev.com/03e765142cd8c54c3c082a1924f1c13b4ba18e59/third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/response-legacystream.html
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/bindings/core/v8/custom/V8XMLHttpRequestCustom.cpp
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/core/core_idl_files.gni
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/core/streams/Stream.h
[delete] https://crrev.com/03e765142cd8c54c3c082a1924f1c13b4ba18e59/third_party/WebKit/Source/core/streams/Stream.idl
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.idl
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/modules/mediasource/SourceBuffer.h
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/modules/mediasource/SourceBuffer.idl
[modify] https://crrev.com/5862e0528606bfd42e997aeef1b6b82db5f26313/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in

[bulk-edit : please ignore if not applicable]

Could you please set the correct milestone for this issue?