/*
* Copyright (C) 2012 Google Inc. All rights reserved.
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* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "modules/mediasource/WebKitSourceBuffer.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/html/TimeRanges.h"
#include "modules/mediasource/WebKitMediaSource.h"
#include "platform/TraceEvent.h"
#include "public/platform/WebSourceBuffer.h"
#include "wtf/Uint8Array.h"
using blink::WebSourceBuffer;
namespace WebCore {
static bool throwExceptionIfRemoved(bool isRemoved, ExceptionState& exceptionState)
{
if (isRemoved) {
exceptionState.throwDOMException(InvalidStateError, "This SourceBuffer has been removed from its parent MediaSource.");
return true;
}
return false;
}
PassRefPtrWillBeRawPtr<WebKitSourceBuffer> WebKitSourceBuffer::create(PassOwnPtr<WebSourceBuffer> webSourceBuffer, PassRefPtrWillBeRawPtr<WebKitMediaSource> source)
{
return adoptRefWillBeNoop(new WebKitSourceBuffer(webSourceBuffer, source));
}
WebKitSourceBuffer::WebKitSourceBuffer(PassOwnPtr<WebSourceBuffer> webSourceBuffer, PassRefPtrWillBeRawPtr<WebKitMediaSource> source)
: m_webSourceBuffer(webSourceBuffer)
, m_source(source)
, m_timestampOffset(0)
{
ASSERT(m_webSourceBuffer);
ASSERT(m_source);
ScriptWrappable::init(this);
}
WebKitSourceBuffer::~WebKitSourceBuffer()
{
}
PassRefPtr<TimeRanges> WebKitSourceBuffer::buffered(ExceptionState& exceptionState) const
{
// Section 3.1 buffered attribute steps.
// 1. If this object has been removed from the sourceBuffers attribute of the parent media source then throw an
// InvalidStateError exception and abort these steps.
if (throwExceptionIfRemoved(isRemoved(), exceptionState))
return nullptr;
// 2. Return a new static normalized TimeRanges object for the media segments buffered.
return TimeRanges::create(m_webSourceBuffer->buffered());
}
double WebKitSourceBuffer::timestampOffset() const
{
return m_timestampOffset;
}
void WebKitSourceBuffer::setTimestampOffset(double offset, ExceptionState& exceptionState)
{
// Section 3.1 timestampOffset attribute setter steps.
// 1. If this object has been removed from the sourceBuffers attribute of the parent media source then throw an
// InvalidStateError exception and abort these steps.
if (throwExceptionIfRemoved(isRemoved(), exceptionState))
return;
// 4. If the readyState attribute of the parent media source is in the "ended" state then run the following steps:
// 4.1 Set the readyState attribute of the parent media source to "open"
// 4.2 Queue a task to fire a simple event named sourceopen at the parent media source.
m_source->openIfInEndedState();
// 5. If this object is waiting for the end of a media segment to be appended, then throw an InvalidStateError
// and abort these steps.
if (!m_webSourceBuffer->setTimestampOffset(offset)) {
exceptionState.throwDOMException(InvalidStateError, "This SourceBuffer is waiting for the end of a media segment to be appended.");
return;
}
// 6. Update the attribute to the new value.
m_timestampOffset = offset;
}
void WebKitSourceBuffer::append(PassRefPtr<Uint8Array> data, ExceptionState& exceptionState)
{
TRACE_EVENT0("media", "SourceBuffer::append");
// SourceBuffer.append() steps from October 1st version of the Media Source Extensions spec.
// https://dvcs.w3.org/hg/html-media/raw-file/7bab66368f2c/media-source/media-source.html#dom-append
// 2. If data is null then throw an InvalidAccessError exception and abort these steps.
if (!data) {
exceptionState.throwDOMException(InvalidAccessError, "The data array provided is invalid.");
return;
}
// 3. If this object has been removed from the sourceBuffers attribute of media source then throw
// an InvalidStateError exception and abort these steps.
if (throwExceptionIfRemoved(isRemoved(), exceptionState))
return;
// 5. If the readyState attribute of media source is in the "ended" state then run the following steps:
// 5.1. Set the readyState attribute of media source to "open"
// 5.2. Queue a task to fire a simple event named sourceopen at media source.
m_source->openIfInEndedState();
// Steps 6 & beyond are handled by m_webSourceBuffer.
// Use null for |timestampOffset| parameter because the prefixed API does not allow appends
// to update timestampOffset.
m_webSourceBuffer->append(data->data(), data->length(), 0);
}
void WebKitSourceBuffer::abort(ExceptionState& exceptionState)
{
// Section 3.2 abort() method steps.
// 1. If this object has been removed from the sourceBuffers attribute of the parent media source
// then throw an InvalidStateError exception and abort these steps.
// 2. If the readyState attribute of the parent media source is not in the "open" state
// then throw an InvalidStateError exception and abort these steps.
if (throwExceptionIfRemoved(isRemoved(), exceptionState))
return;
if (!m_source->isOpen()) {
exceptionState.throwDOMException(InvalidStateError, "The parent MediaSource's readyState is not 'open'.");
return;
}
// 4. Run the reset parser state algorithm.
m_webSourceBuffer->abort();
}
void WebKitSourceBuffer::removedFromMediaSource()
{
if (isRemoved())
return;
m_webSourceBuffer->removedFromMediaSource();
m_source.clear();
}
bool WebKitSourceBuffer::isRemoved() const
{
return !m_source;
}
void WebKitSourceBuffer::trace(Visitor* visitor)
{
visitor->trace(m_source);
}
} // namespace WebCore