SourceBuffer* MediaSource::addSourceBuffer(const String& type, ExceptionCode& ec)
{
LOG(MediaSource, "MediaSource::addSourceBuffer(%s) %p", type.ascii().data(), this);
// 2.2 https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type
// 1. If type is null or an empty then throw an INVALID_ACCESS_ERR exception and
// abort these steps.
if (type.isNull() || type.isEmpty()) {
ec = INVALID_ACCESS_ERR;
return nullptr;
}
// 2. If type contains a MIME type that is not supported ..., then throw a
// NOT_SUPPORTED_ERR exception and abort these steps.
if (!isTypeSupported(type)) {
ec = NOT_SUPPORTED_ERR;
return nullptr;
}
// 4. If the readyState attribute is not in the "open" state then throw an
// INVALID_STATE_ERR exception and abort these steps.
if (!isOpen()) {
ec = INVALID_STATE_ERR;
return nullptr;
}
// 5. Create a new SourceBuffer object and associated resources.
ContentType contentType(type);
RefPtr<SourceBufferPrivate> sourceBufferPrivate = createSourceBufferPrivate(contentType, ec);
if (!sourceBufferPrivate) {
ASSERT(ec == NOT_SUPPORTED_ERR || ec == QUOTA_EXCEEDED_ERR);
// 2. If type contains a MIME type that is not supported ..., then throw a NOT_SUPPORTED_ERR exception and abort these steps.
// 3. If the user agent can't handle any more SourceBuffer objects then throw a QUOTA_EXCEEDED_ERR exception and abort these steps
return 0;
}
RefPtr<SourceBuffer> buffer = SourceBuffer::create(sourceBufferPrivate.releaseNonNull(), this);
// 6. Add the new object to sourceBuffers and fire a addsourcebuffer on that object.
m_sourceBuffers->add(buffer);
regenerateActiveSourceBuffers();
// 7. Return the new object to the caller.
return buffer.get();
}
void MediaSource::sourceBufferDidChangeActiveState(SourceBuffer&, bool)
{
regenerateActiveSourceBuffers();
}
SourceBuffer* MediaSource::addSourceBuffer(const String& type, ExceptionCode& ec)
{
LOG(MediaSource, "MediaSource::addSourceBuffer(%s) %p", type.ascii().data(), this);
// 2.2 http://www.w3.org/TR/media-source/#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type
// When this method is invoked, the user agent must run the following steps:
// 1. If type is an empty string then throw a TypeError exception and abort these steps.
if (type.isEmpty()) {
ec = TypeError;
return nullptr;
}
// 2. If type contains a MIME type that is not supported ..., then throw a
// NOT_SUPPORTED_ERR exception and abort these steps.
if (!isTypeSupported(type)) {
ec = NOT_SUPPORTED_ERR;
return nullptr;
}
// 4. If the readyState attribute is not in the "open" state then throw an
// INVALID_STATE_ERR exception and abort these steps.
if (!isOpen()) {
ec = INVALID_STATE_ERR;
return nullptr;
}
// 5. Create a new SourceBuffer object and associated resources.
ContentType contentType(type);
RefPtr<SourceBufferPrivate> sourceBufferPrivate = createSourceBufferPrivate(contentType, ec);
if (!sourceBufferPrivate) {
ASSERT(ec == NOT_SUPPORTED_ERR || ec == QUOTA_EXCEEDED_ERR);
// 2. If type contains a MIME type that is not supported ..., then throw a NOT_SUPPORTED_ERR exception and abort these steps.
// 3. If the user agent can't handle any more SourceBuffer objects then throw a QUOTA_EXCEEDED_ERR exception and abort these steps
return nullptr;
}
Ref<SourceBuffer> buffer = SourceBuffer::create(sourceBufferPrivate.releaseNonNull(), this);
// 6. Set the generate timestamps flag on the new object to the value in the "Generate Timestamps Flag"
// column of the byte stream format registry [MSE-REGISTRY] entry that is associated with type.
// NOTE: In the current byte stream format registry <http://www.w3.org/2013/12/byte-stream-format-registry/>
// only the "MPEG Audio Byte Stream Format" has the "Generate Timestamps Flag" value set.
bool shouldGenerateTimestamps = contentType.type() == "audio/aac" || contentType.type() == "audio/mpeg";
buffer->setShouldGenerateTimestamps(shouldGenerateTimestamps);
// 7. If the generate timestamps flag equals true:
// ↳ Set the mode attribute on the new object to "sequence".
// Otherwise:
// ↳ Set the mode attribute on the new object to "segments".
buffer->setMode(shouldGenerateTimestamps ? SourceBuffer::AppendMode::Sequence : SourceBuffer::AppendMode::Segments, IGNORE_EXCEPTION);
SourceBuffer* result = buffer.ptr();
// 8. Add the new object to sourceBuffers and fire a addsourcebuffer on that object.
m_sourceBuffers->add(WTFMove(buffer));
regenerateActiveSourceBuffers();
// 9. Return the new object to the caller.
return result;
}