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/*
* Copyright (C) 2020 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 "MediaRecorderPrivate.h"
#if ENABLE(MEDIA_RECORDER)
#include "MediaStreamPrivate.h"
namespace WebCore {
constexpr unsigned SmallAudioBitRate = 8000;
constexpr unsigned SmallVideoBitRate = 80000;
constexpr unsigned LargeAudioBitRate = 192000;
constexpr unsigned LargeVideoBitRate = 10000000;
MediaRecorderPrivate::AudioVideoSelectedTracks MediaRecorderPrivate::selectTracks(MediaStreamPrivate& stream)
{
AudioVideoSelectedTracks selectedTracks;
stream.forEachTrack([&](auto& track) {
if (track.ended())
return;
switch (track.type()) {
case RealtimeMediaSource::Type::Video: {
auto& settings = track.settings();
if (!selectedTracks.videoTrack && settings.supportsWidth() && settings.supportsHeight())
selectedTracks.videoTrack = &track;
break;
}
case RealtimeMediaSource::Type::Audio:
if (!selectedTracks.audioTrack)
selectedTracks.audioTrack = &track;
break;
}
});
return selectedTracks;
}
void MediaRecorderPrivate::checkTrackState(const MediaStreamTrackPrivate& track)
{
if (&track.source() == m_audioSource.get()) {
m_shouldMuteAudio = track.muted() || !track.enabled();
return;
}
if (&track.source() == m_videoSource.get())
m_shouldMuteVideo = track.muted() || !track.enabled();
}
void MediaRecorderPrivate::stop(CompletionHandler<void()>&& completionHandler)
{
setAudioSource(nullptr);
setVideoSource(nullptr);
stopRecording(WTFMove(completionHandler));
}
void MediaRecorderPrivate::pause(CompletionHandler<void()>&& completionHandler)
{
ASSERT(!m_pausedAudioSource);
ASSERT(!m_pausedVideoSource);
m_pausedAudioSource = m_audioSource;
m_pausedVideoSource = m_videoSource;
setAudioSource(nullptr);
setVideoSource(nullptr);
pauseRecording(WTFMove(completionHandler));
}
void MediaRecorderPrivate::resume(CompletionHandler<void()>&& completionHandler)
{
ASSERT(m_pausedAudioSource || m_pausedVideoSource);
setAudioSource(WTFMove(m_pausedAudioSource));
setVideoSource(WTFMove(m_pausedVideoSource));
resumeRecording(WTFMove(completionHandler));
}
MediaRecorderPrivate::BitRates MediaRecorderPrivate::computeBitRates(const MediaRecorderPrivateOptions& options, const MediaStreamPrivate* stream)
{
if (options.bitsPerSecond) {
bool hasAudio = stream ? stream->hasAudio() : true;
bool hasVideo = stream ? stream->hasVideo() : true;
auto totalBitsPerSecond = *options.bitsPerSecond;
if (hasAudio && hasVideo) {
auto audioBitsPerSecond = std::min(LargeAudioBitRate, std::max(SmallAudioBitRate, totalBitsPerSecond / 10));
auto remainingBitsPerSecond = totalBitsPerSecond > audioBitsPerSecond ? (totalBitsPerSecond - audioBitsPerSecond) : 0;
return { audioBitsPerSecond, std::max(remainingBitsPerSecond, SmallVideoBitRate) };
}
if (hasAudio)
return { std::max(SmallAudioBitRate, totalBitsPerSecond), 0 };
return { 0, std::max(SmallVideoBitRate, totalBitsPerSecond) };
}
return { options.audioBitsPerSecond.value_or(LargeAudioBitRate), options.videoBitsPerSecond.value_or(LargeVideoBitRate) };
}
} // namespace WebCore
#endif // ENABLE(MEDIA_RECORDER)
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