草案
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这是
实验性技术
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要小心谨慎在生产中使用这之前。
abort()
方法在
SourceBuffer
interface aborts the current segment and resets the segment parser.
sourceBuffer.abort();
None.
| 异常 | 解释 |
|---|---|
InvalidStateError
|
MediaSource.readyState
property of the parent media source is not equal to
open
, or this
SourceBuffer
has been removed from the
MediaSource
.
|
The spec description of
abort()
is somewhat confusing — consider for example step 1 of
reset parser state
. The MSE API is fully asynchronous, but this step seems to suggest a synchronous (blocking) operation, which doesn't make sense.
Saying that, current implementations can be useful in certain situations, when you want to stop the current append (or whatever) operation occuring on a sourcebuffer, and then immediately start performing operations on it again. For example, consider this code:
sourceBuffer.addEventListener('updateend', function (_) {
...
});
sourceBuffer.appendBuffer(buf);
Let's say that after the call to
appendBuffer
BUT before the
updateend
event fires (i.e. a buffer is being appended but the operation has not yet completed) a user "scrubs" the video seeking to a new point in time. In this case you would want to manually call
abort()
on the source buffer to stop the decoding of the current buffer, then fetch and append the newly requested segment that relates to the current new position of the video.
You can see something similar in action in Nick Desaulnier's
bufferWhenNeeded demo
— in
line 48, an event listener is added to the playing video
so a function called
seek()
is run when the
seeking
event fires. In
lines 92-101, the seek() function is defined
— note that
abort()
is called if
MediaSource.readyState
被设为
open
, which means that it is ready to receive new source buffers — at this point it is worth aborting the current segment and just getting the one for the new seek position (see
checkBuffer()
and
getCurrentSegment()
)。
| 规范 | 状态 | 注释 |
|---|---|---|
|
媒体源扩展
The definition of 'abort()' in that specification. |
推荐 | 初始定义。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
abort
|
Chrome 23 | Edge 12 | Firefox 42 | IE 11 | Opera 15 | Safari 8 | WebView Android 4.4.3 | Chrome Android 25 | Firefox Android 不支持 No | Opera Android 14 | Safari iOS 不支持 No | Samsung Internet Android 2.0 |
完整支持
不支持
见实现注意事项。
用户必须明确启用此特征。