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/*
* Copyright (C) 2014-2023 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. ``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
* 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 "ISOVTTCue.h"
#include "Logging.h"
#include <JavaScriptCore/DataView.h>
#include <wtf/JSONValues.h>
#include <wtf/URL.h>
using JSC::DataView;
namespace WebCore {
class ISOStringBox final : public ISOBox {
public:
const String& contents() { return m_contents; }
private:
bool parse(JSC::DataView& view, unsigned& offset) override
{
unsigned localOffset = offset;
if (!ISOBox::parse(view, localOffset))
return false;
auto characterCount = m_size - (localOffset - offset);
if (!characterCount) {
m_contents = emptyString();
return true;
}
auto bytesRemaining = view.byteLength() - localOffset;
if (characterCount > bytesRemaining)
return false;
Vector<LChar> characters;
characters.reserveInitialCapacity(static_cast<size_t>(characterCount));
while (characterCount--) {
int8_t character = 0;
if (!checkedRead<int8_t>(character, view, localOffset, BigEndian))
return false;
characters.uncheckedAppend(character);
}
m_contents = String::fromUTF8(characters);
offset = localOffset;
return true;
}
String m_contents;
};
static FourCC vttIdBoxType() { return "iden"; }
static FourCC vttSettingsBoxType() { return "sttg"; }
static FourCC vttPayloadBoxType() { return "payl"; }
static FourCC vttCurrentTimeBoxType() { return "ctim"; }
static FourCC vttCueSourceIDBoxType() { return "vsid"; }
ISOWebVTTCue::ISOWebVTTCue(const MediaTime& presentationTime, const MediaTime& duration)
: m_presentationTime(presentationTime)
, m_duration(duration)
{
}
ISOWebVTTCue::ISOWebVTTCue(MediaTime&& presentationTime, MediaTime&& duration, AtomString&& cueID, String&& cueText, String&& settings, String&& sourceID, String&& originalStartTime)
: m_presentationTime(WTFMove(presentationTime))
, m_duration(WTFMove(duration))
, m_sourceID(WTFMove(sourceID))
, m_identifier(WTFMove(cueID))
, m_originalStartTime(WTFMove(originalStartTime))
, m_settings(WTFMove(settings))
, m_cueText(WTFMove(cueText))
{
}
ISOWebVTTCue::ISOWebVTTCue() = default;
ISOWebVTTCue::ISOWebVTTCue(ISOWebVTTCue&&) = default;
ISOWebVTTCue::~ISOWebVTTCue() = default;
bool ISOWebVTTCue::parse(DataView& view, unsigned& offset)
{
if (!ISOBox::parse(view, offset))
return false;
ISOStringBox stringBox;
while (stringBox.read(view, offset)) {
if (stringBox.boxType() == vttCueSourceIDBoxType())
m_sourceID = stringBox.contents();
else if (stringBox.boxType() == vttIdBoxType())
m_identifier = AtomString { stringBox.contents() };
else if (stringBox.boxType() == vttCurrentTimeBoxType())
m_originalStartTime = stringBox.contents();
else if (stringBox.boxType() == vttSettingsBoxType())
m_settings = stringBox.contents();
else if (stringBox.boxType() == vttPayloadBoxType())
m_cueText = stringBox.contents();
else
LOG(Media, "ISOWebVTTCue::ISOWebVTTCue - skipping box id = \"%s\", size = %" PRIu64, stringBox.boxType().string().data(), stringBox.size());
}
return true;
}
String ISOWebVTTCue::toJSONString() const
{
auto object = JSON::Object::create();
object->setString("text"_s, m_cueText);
object->setString("sourceId"_s, encodeWithURLEscapeSequences(m_sourceID));
object->setString("id"_s, encodeWithURLEscapeSequences(m_identifier));
object->setString("originalStartTime"_s, encodeWithURLEscapeSequences(m_originalStartTime));
object->setString("settings"_s, encodeWithURLEscapeSequences(m_settings));
object->setDouble("presentationTime"_s, m_presentationTime.toDouble());
object->setDouble("duration"_s, m_duration.toDouble());
return object->toJSONString();
}
} // namespace WebCore
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