Source/WebCore/Modules/mediastream/libwebrtc/LibWebRTCRtpReceiverBackend.cpp

/*
 * Copyright (C) 2018 Apple Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1.  Redistributions of source code must retain the above copyright
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 *     documentation and/or other materials provided with the distribution.
 *
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#include "config.h"
#include "LibWebRTCRtpReceiverBackend.h"

#include "Document.h"
#include "LibWebRTCAudioModule.h"
#include "LibWebRTCDtlsTransportBackend.h"
#include "LibWebRTCProvider.h"
#include "LibWebRTCRtpReceiverTransformBackend.h"
#include "LibWebRTCUtils.h"
#include "Page.h"
#include "RTCRtpTransformBackend.h"
#include "RealtimeIncomingAudioSource.h"
#include "RealtimeIncomingVideoSource.h"

#if ENABLE(WEB_RTC) && USE(LIBWEBRTC)

ALLOW_UNUSED_PARAMETERS_BEGIN
ALLOW_DEPRECATED_DECLARATIONS_BEGIN

#include <webrtc/api/rtp_receiver_interface.h>

ALLOW_DEPRECATED_DECLARATIONS_END
ALLOW_UNUSED_PARAMETERS_END

namespace WebCore {

LibWebRTCRtpReceiverBackend::LibWebRTCRtpReceiverBackend(rtc::scoped_refptr<webrtc::RtpReceiverInterface>&& rtcReceiver)
    : m_rtcReceiver(WTFMove(rtcReceiver))
{
}

LibWebRTCRtpReceiverBackend::~LibWebRTCRtpReceiverBackend() = default;

RTCRtpParameters LibWebRTCRtpReceiverBackend::getParameters()
{
    return toRTCRtpParameters(m_rtcReceiver->GetParameters());
}

static inline void fillRTCRtpContributingSource(RTCRtpContributingSource& source, const webrtc::RtpSource& rtcSource)
{
    source.timestamp = rtcSource.timestamp_ms();
    source.rtpTimestamp = rtcSource.rtp_timestamp();
    source.source = rtcSource.source_id();
    if (rtcSource.audio_level())
        source.audioLevel = (*rtcSource.audio_level() == 127) ? 0 : pow(10, -*rtcSource.audio_level() / 20);
}

static inline RTCRtpContributingSource toRTCRtpContributingSource(const webrtc::RtpSource& rtcSource)
{
    RTCRtpContributingSource source;
    fillRTCRtpContributingSource(source, rtcSource);
    return source;
}

static inline RTCRtpSynchronizationSource toRTCRtpSynchronizationSource(const webrtc::RtpSource& rtcSource)
{
    RTCRtpSynchronizationSource source;
    fillRTCRtpContributingSource(source, rtcSource);
    return source;
}

Vector<RTCRtpContributingSource> LibWebRTCRtpReceiverBackend::getContributingSources() const
{
    Vector<RTCRtpContributingSource> sources;
    for (auto& rtcSource : m_rtcReceiver->GetSources()) {
        if (rtcSource.source_type() == webrtc::RtpSourceType::CSRC)
            sources.append(toRTCRtpContributingSource(rtcSource));
    }
    return sources;
}

Vector<RTCRtpSynchronizationSource> LibWebRTCRtpReceiverBackend::getSynchronizationSources() const
{
    Vector<RTCRtpSynchronizationSource> sources;
    for (auto& rtcSource : m_rtcReceiver->GetSources()) {
        if (rtcSource.source_type() == webrtc::RtpSourceType::SSRC)
            sources.append(toRTCRtpSynchronizationSource(rtcSource));
    }
    return sources;
}

Ref<RealtimeMediaSource> LibWebRTCRtpReceiverBackend::createSource(Document& document)
{
    auto rtcTrack = m_rtcReceiver->track();
    switch (m_rtcReceiver->media_type()) {
    case cricket::MEDIA_TYPE_DATA:
    case cricket::MEDIA_TYPE_UNSUPPORTED:
        break;
    case cricket::MEDIA_TYPE_AUDIO: {
        rtc::scoped_refptr<webrtc::AudioTrackInterface> audioTrack = static_cast<webrtc::AudioTrackInterface*>(rtcTrack.get());
        auto source = RealtimeIncomingAudioSource::create(WTFMove(audioTrack), fromStdString(rtcTrack->id()));
        if (document.page())
            source->setAudioModule(document.page()->libWebRTCProvider().audioModule());
        return source;
    }
    case cricket::MEDIA_TYPE_VIDEO: {
        rtc::scoped_refptr<webrtc::VideoTrackInterface> videoTrack = static_cast<webrtc::VideoTrackInterface*>(rtcTrack.get());
        return RealtimeIncomingVideoSource::create(WTFMove(videoTrack), fromStdString(rtcTrack->id()));
    }
    }
    RELEASE_ASSERT_NOT_REACHED();
}

Ref<RTCRtpTransformBackend> LibWebRTCRtpReceiverBackend::rtcRtpTransformBackend()
{
    if (!m_transformBackend)
        m_transformBackend = LibWebRTCRtpReceiverTransformBackend::create(m_rtcReceiver);
    return *m_transformBackend;
}

std::unique_ptr<RTCDtlsTransportBackend> LibWebRTCRtpReceiverBackend::dtlsTransportBackend()
{
    auto backend = m_rtcReceiver->dtls_transport();
    return backend ? makeUnique<LibWebRTCDtlsTransportBackend>(WTFMove(backend)) : nullptr;
}

} // namespace WebCore

#endif // ENABLE(WEB_RTC) && USE(LIBWEBRTC)