Source/WebCore/platform/mediastream/mac/MediaStreamTrackAudioSourceProviderCocoa.cpp

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 *
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#import "config.h"
#import "MediaStreamTrackAudioSourceProviderCocoa.h"

#if ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)

#import "LibWebRTCAudioModule.h"

namespace WebCore {

Ref<MediaStreamTrackAudioSourceProviderCocoa> MediaStreamTrackAudioSourceProviderCocoa::create(MediaStreamTrackPrivate& source)
{
    return adoptRef(*new MediaStreamTrackAudioSourceProviderCocoa(source));
}

MediaStreamTrackAudioSourceProviderCocoa::MediaStreamTrackAudioSourceProviderCocoa(MediaStreamTrackPrivate& source)
    : m_captureSource(source)
    , m_source(source.source())
{
#if USE(LIBWEBRTC)
    if (m_source->isIncomingAudioSource())
        setPollSamplesCount(LibWebRTCAudioModule::PollSamplesCount + 1);
#endif
}

MediaStreamTrackAudioSourceProviderCocoa::~MediaStreamTrackAudioSourceProviderCocoa()
{
    ASSERT(!m_connected);
    m_source->removeAudioSampleObserver(*this);
}

void MediaStreamTrackAudioSourceProviderCocoa::hasNewClient(AudioSourceProviderClient* client)
{
    bool shouldBeConnected = !!client;
    if (m_connected == shouldBeConnected)
        return;

    m_connected = shouldBeConnected;
    if (!client) {
        if (m_captureSource)
            m_captureSource->removeObserver(*this);
        m_source->removeAudioSampleObserver(*this);
        return;
    }

    m_enabled = m_captureSource->enabled();
    m_captureSource->addObserver(*this);
    m_source->addAudioSampleObserver(*this);
}

void MediaStreamTrackAudioSourceProviderCocoa::trackEnabledChanged(MediaStreamTrackPrivate& track)
{
    m_enabled = track.enabled();
}

// May get called on a background thread.
void MediaStreamTrackAudioSourceProviderCocoa::audioSamplesAvailable(const MediaTime&, const PlatformAudioData& data, const AudioStreamDescription& description, size_t frameCount)
{
    if (!m_enabled)
        return;

    receivedNewAudioSamples(data, description, frameCount);
}

}

#endif // ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)