Source/WebCore/Modules/mediastream/RTCRtpTransceiver.cpp

/*
 * Copyright (C) 2016 Ericsson AB. All rights reserved.
 * Copyright (C) 2017 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.
 * 3. Neither the name of Ericsson nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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 "RTCRtpTransceiver.h"

#if ENABLE(WEB_RTC)

#include <wtf/NeverDestroyed.h>

namespace WebCore {

#define STRING_FUNCTION(name) \
    static const String& name##String() \
    { \
        static NeverDestroyed<const String> name(MAKE_STATIC_STRING_IMPL(#name)); \
        return name; \
    }

STRING_FUNCTION(sendrecv)
STRING_FUNCTION(sendonly)
STRING_FUNCTION(recvonly)
STRING_FUNCTION(inactive)

String RTCRtpTransceiver::getNextMid()
{
    static unsigned mid = 0;
    return String::number(++mid);
}

RTCRtpTransceiver::RTCRtpTransceiver(Ref<RTCRtpSender>&& sender, Ref<RTCRtpReceiver>&& receiver)
    : m_direction(RTCRtpTransceiverDirection::Sendrecv)
    , m_sender(WTFMove(sender))
    , m_receiver(WTFMove(receiver))
    , m_iceTransport(RTCIceTransport::create())
{
}

const String& RTCRtpTransceiver::directionString() const
{
    switch (m_direction) {
    case RTCRtpTransceiverDirection::Sendrecv:
        return sendrecvString();
    case RTCRtpTransceiverDirection::Sendonly:
        return sendonlyString();
    case RTCRtpTransceiverDirection::Recvonly:
        return recvonlyString();
    case RTCRtpTransceiverDirection::Inactive:
        return inactiveString();
    }

    ASSERT_NOT_REACHED();
    return inactiveString();
}

bool RTCRtpTransceiver::hasSendingDirection() const
{
    return m_direction == RTCRtpTransceiverDirection::Sendrecv || m_direction == RTCRtpTransceiverDirection::Sendonly;
}

void RTCRtpTransceiver::enableSendingDirection()
{
    if (m_direction == RTCRtpTransceiverDirection::Recvonly)
        m_direction = RTCRtpTransceiverDirection::Sendrecv;
    else if (m_direction == RTCRtpTransceiverDirection::Inactive)
        m_direction = RTCRtpTransceiverDirection::Sendonly;
}

void RTCRtpTransceiver::disableSendingDirection()
{
    if (m_direction == RTCRtpTransceiverDirection::Sendrecv)
        m_direction = RTCRtpTransceiverDirection::Recvonly;
    else if (m_direction == RTCRtpTransceiverDirection::Sendonly)
        m_direction = RTCRtpTransceiverDirection::Inactive;
}

void RtpTransceiverSet::append(Ref<RTCRtpTransceiver>&& transceiver)
{
    m_senders.append(transceiver->sender());
    m_receivers.append(transceiver->receiver());

    m_transceivers.append(WTFMove(transceiver));
}

} // namespace WebCore

#endif // ENABLE(WEB_RTC)