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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "RTCEncodedStreamProducer.h"
#if ENABLE(WEB_RTC)
#include "JSRTCEncodedAudioFrame.h"
#include "JSRTCEncodedVideoFrame.h"
#include "ReadableStreamSource.h"
#include "WritableStreamSink.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(RTCEncodedStreamProducer);
RTCEncodedStreamProducer::~RTCEncodedStreamProducer() = default;
ExceptionOr<Ref<RTCEncodedStreamProducer>> RTCEncodedStreamProducer::create(ScriptExecutionContext& context, Ref<RTCRtpTransformBackend>&& transformBackend, bool isVideo)
{
auto* globalObject = JSC::jsCast<JSDOMGlobalObject*>(context.globalObject());
if (!globalObject)
return Exception { ExceptionCode::InvalidStateError };
Ref readableSource = SimpleReadableStreamSource::create();
auto readable = ReadableStream::create(*globalObject, readableSource.copyRef());
if (readable.hasException())
return readable.releaseException();
Ref producer = adoptRef(*new RTCEncodedStreamProducer(context, readable.releaseReturnValue(), WTFMove(readableSource), WTFMove(transformBackend), isVideo));
if (auto exception = producer->initialize(*globalObject))
return { WTFMove(*exception) };
return producer;
}
RTCEncodedStreamProducer::RTCEncodedStreamProducer(ScriptExecutionContext& context, Ref<ReadableStream>&& readable, Ref<SimpleReadableStreamSource>&& readableSource, Ref<RTCRtpTransformBackend>&& transformBackend, bool isVideo)
: m_context({ context })
, m_readable(WTFMove(readable))
, m_readableSource(WTFMove(readableSource))
, m_transformBackend(WTFMove(transformBackend))
, m_isVideo(isVideo)
{
}
std::optional<Exception> RTCEncodedStreamProducer::initialize(JSDOMGlobalObject& globalObject)
{
auto writable = WritableStream::create(globalObject, SimpleWritableStreamSink::create([weakThis = WeakPtr { *this }](auto& context, auto value) -> ExceptionOr<void> {
RefPtr protectedThis = weakThis.get();
return protectedThis ? protectedThis->writeFrame(context, value) : Exception { ExceptionCode::InvalidStateError };
}));
if (writable.hasException())
return writable.releaseException();
lazyInitialize(m_writable, writable.releaseReturnValue());
m_transformBackend->setTransformableFrameCallback([weakThis = WeakPtr { *this }](Ref<RTCRtpTransformableFrame>&& frame) mutable {
callOnMainThread([weakThis, frame = WTFMove(frame)]() mutable {
if (RefPtr protectedThis = weakThis.get())
protectedThis->enqueueFrame(WTFMove(frame));
});
});
return { };
}
void RTCEncodedStreamProducer::enqueueFrame(Ref<RTCRtpTransformableFrame>&& frame)
{
RefPtr context = m_context.get();
if (!context)
return;
auto* globalObject = JSC::jsCast<JSDOMGlobalObject*>(context->globalObject());
if (!globalObject)
return;
Ref vm = globalObject->vm();
JSC::JSLockHolder lock(vm);
auto value = m_isVideo ? toJS(globalObject, globalObject, RTCEncodedVideoFrame::create(WTFMove(frame))) : toJS(globalObject, globalObject, RTCEncodedAudioFrame::create(WTFMove(frame)));
m_readableSource->enqueue(value);
}
ExceptionOr<void> RTCEncodedStreamProducer::writeFrame(ScriptExecutionContext& context, JSC::JSValue value)
{
auto* globalObject = context.globalObject();
if (!globalObject)
return { };
Ref vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
auto frameConversionResult = convert<IDLUnion<IDLInterface<RTCEncodedAudioFrame>, IDLInterface<RTCEncodedVideoFrame>>>(*globalObject, value);
if (frameConversionResult.hasException(scope)) [[unlikely]]
return Exception { ExceptionCode::ExistingExceptionError };
auto frame = frameConversionResult.releaseReturnValue();
auto rtcFrame = WTF::switchOn(frame, [&](RefPtr<RTCEncodedAudioFrame>& value) {
return value->rtcFrame(vm);
}, [&](RefPtr<RTCEncodedVideoFrame>& value) {
return value->rtcFrame(vm);
});
// If no data, skip the frame since there is nothing to packetize or decode.
if (rtcFrame->data().data())
m_transformBackend->processTransformedFrame(rtcFrame.get());
return { };
}
} // namespace WebCore
#endif // ENABLE(WEB_RTC)
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