MediaStreamTrackPrivate.cpp   [plain text]

/*
 *  Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
 *  Copyright (C) 2015 Ericsson AB. 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 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "MediaStreamTrackPrivate.h"

#if ENABLE(MEDIA_STREAM)

#include "AudioSourceProvider.h"
#include "GraphicsContext.h"
#include "IntRect.h"
#include "MediaSourceSettings.h"
#include "UUID.h"
#include <wtf/NeverDestroyed.h>

namespace WebCore {

RefPtr<MediaStreamTrackPrivate> MediaStreamTrackPrivate::create(RefPtr<RealtimeMediaSource>&& source)
{
    return adoptRef(new MediaStreamTrackPrivate(WTFMove(source), createCanonicalUUIDString()));
}

RefPtr<MediaStreamTrackPrivate> MediaStreamTrackPrivate::create(RefPtr<RealtimeMediaSource>&& source, const String& id)
{
    return adoptRef(new MediaStreamTrackPrivate(WTFMove(source), id));
}

MediaStreamTrackPrivate::MediaStreamTrackPrivate(const MediaStreamTrackPrivate& other)
    : RefCounted()
    , m_source(&other.source())
    , m_id(createCanonicalUUIDString())
    , m_isEnabled(other.enabled())
    , m_isEnded(other.ended())
{
    m_source->addObserver(this);
}

MediaStreamTrackPrivate::MediaStreamTrackPrivate(RefPtr<RealtimeMediaSource>&& source, const String& id)
    : RefCounted()
    , m_source(source)
    , m_id(id)
    , m_isEnabled(true)
    , m_isEnded(false)
{
    m_source->addObserver(this);
}

MediaStreamTrackPrivate::~MediaStreamTrackPrivate()
{
    m_source->removeObserver(this);
}

void MediaStreamTrackPrivate::addObserver(MediaStreamTrackPrivate::Observer& observer)
{
    m_observers.append(&observer);
}

void MediaStreamTrackPrivate::removeObserver(MediaStreamTrackPrivate::Observer& observer)
{
    size_t pos = m_observers.find(&observer);
    if (pos != notFound)
        m_observers.remove(pos);
}

const String& MediaStreamTrackPrivate::label() const
{
    return m_source->name();
}

bool MediaStreamTrackPrivate::muted() const
{
    return m_source->muted();
}

bool MediaStreamTrackPrivate::readonly() const
{
    return m_source->readonly();
}

bool MediaStreamTrackPrivate::remote() const
{
    return m_source->remote();
}

void MediaStreamTrackPrivate::setEnabled(bool enabled)
{
    if (m_isEnabled == enabled)
        return;

    // Always update the enabled state regardless of the track being ended.
    m_isEnabled = enabled;

    for (auto& observer : m_observers)
        observer->trackEnabledChanged(*this);
}

void MediaStreamTrackPrivate::endTrack()
{
    if (m_isEnded)
        return;

    // Set m_isEnded to true before telling the source it can stop, so if this is the
    // only track using the source and it does stop, we will only call each observer's
    // trackEnded method once.
    m_isEnded = true;

    m_source->requestStop(this);

    for (auto& observer : m_observers)
        observer->trackEnded(*this);
}

RefPtr<MediaStreamTrackPrivate> MediaStreamTrackPrivate::clone()
{
    return adoptRef(new MediaStreamTrackPrivate(*this));
}

RealtimeMediaSource::Type MediaStreamTrackPrivate::type() const
{
    return m_source->type();
}

RefPtr<MediaConstraints> MediaStreamTrackPrivate::constraints() const
{
    return m_constraints;
}

const RealtimeMediaSourceSettings& MediaStreamTrackPrivate::settings() const
{
    return m_source->settings();
}

RefPtr<RealtimeMediaSourceCapabilities> MediaStreamTrackPrivate::capabilities() const
{
    return m_source->capabilities();
}

void MediaStreamTrackPrivate::paintCurrentFrameInContext(GraphicsContext& context, const FloatRect& rect)
{
    if (context.paintingDisabled() || m_source->type() != RealtimeMediaSource::Type::Video || ended())
        return;

    if (!m_source->muted())
        m_source->paintCurrentFrameInContext(context, rect);
    else {
        GraphicsContextStateSaver stateSaver(context);
        context.translate(rect.x(), rect.y() + rect.height());
        IntRect paintRect(IntPoint(0, 0), IntSize(rect.width(), rect.height()));
        context.fillRect(paintRect, Color::black);
    }
}

void MediaStreamTrackPrivate::applyConstraints(const MediaConstraints&)
{
    // FIXME: apply the new constraints to the track
    // https://bugs.webkit.org/show_bug.cgi?id=122428
}

AudioSourceProvider* MediaStreamTrackPrivate::audioSourceProvider()
{
    return m_source->audioSourceProvider();
}

void MediaStreamTrackPrivate::sourceStopped()
{
    if (m_isEnded)
        return;

    m_isEnded = true;

    for (auto& observer : m_observers)
        observer->trackEnded(*this);
}

void MediaStreamTrackPrivate::sourceMutedChanged()
{
    for (auto& observer : m_observers)
        observer->trackMutedChanged(*this);
}

void MediaStreamTrackPrivate::sourceSettingsChanged()
{
    for (auto& observer : m_observers)
        observer->trackSettingsChanged(*this);
}

bool MediaStreamTrackPrivate::preventSourceFromStopping()
{
    // Do not allow the source to stop if we are still using it.
    return !m_isEnded;
}

} // namespace WebCore

#endif // ENABLE(MEDIA_STREAM)