215 lines
7.2 KiB
C++
215 lines
7.2 KiB
C++
/*
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* Copyright (C) 2012 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/FastMalloc.h>
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#include <wtf/JSONValues.h>
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#include <wtf/text/WTFString.h>
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#include <cmath>
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#include <limits>
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#include <math.h>
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#include <stdint.h>
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namespace WTF {
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class PrintStream;
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class WTF_EXPORT_PRIVATE MediaTime final {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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enum {
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Valid = 1 << 0,
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HasBeenRounded = 1 << 1,
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PositiveInfinite = 1 << 2,
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NegativeInfinite = 1 << 3,
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Indefinite = 1 << 4,
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DoubleValue = 1 << 5,
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};
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constexpr MediaTime();
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constexpr MediaTime(int64_t value, uint32_t scale, uint8_t flags = Valid);
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MediaTime(const MediaTime& rhs);
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static MediaTime createWithFloat(float floatTime);
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static MediaTime createWithFloat(float floatTime, uint32_t timeScale);
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static MediaTime createWithDouble(double doubleTime);
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static MediaTime createWithDouble(double doubleTime, uint32_t timeScale);
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float toFloat() const;
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double toDouble() const;
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MediaTime& operator=(const MediaTime& rhs);
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MediaTime& operator+=(const MediaTime& rhs) { return *this = *this + rhs; }
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MediaTime& operator-=(const MediaTime& rhs) { return *this = *this - rhs; }
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MediaTime operator+(const MediaTime& rhs) const;
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MediaTime operator-(const MediaTime& rhs) const;
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MediaTime operator-() const;
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MediaTime operator*(int32_t) const;
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bool operator<(const MediaTime& rhs) const { return compare(rhs) == LessThan; }
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bool operator>(const MediaTime& rhs) const { return compare(rhs) == GreaterThan; }
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bool operator!=(const MediaTime& rhs) const { return compare(rhs) != EqualTo; }
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bool operator==(const MediaTime& rhs) const { return compare(rhs) == EqualTo; }
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bool operator>=(const MediaTime& rhs) const { return compare(rhs) >= EqualTo; }
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bool operator<=(const MediaTime& rhs) const { return compare(rhs) <= EqualTo; }
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bool operator!() const;
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explicit operator bool() const;
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typedef enum {
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LessThan = -1,
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EqualTo = 0,
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GreaterThan = 1,
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} ComparisonFlags;
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ComparisonFlags compare(const MediaTime& rhs) const;
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bool isBetween(const MediaTime&, const MediaTime&) const;
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bool isValid() const { return m_timeFlags & Valid; }
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bool isInvalid() const { return !isValid(); }
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bool hasBeenRounded() const { return m_timeFlags & HasBeenRounded; }
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bool isPositiveInfinite() const { return m_timeFlags & PositiveInfinite; }
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bool isNegativeInfinite() const { return m_timeFlags & NegativeInfinite; }
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bool isIndefinite() const { return m_timeFlags & Indefinite; }
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bool isFinite() const { return !isInvalid() && !isIndefinite() && !isPositiveInfinite() && !isNegativeInfinite(); }
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bool hasDoubleValue() const { return m_timeFlags & DoubleValue; }
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uint8_t timeFlags() const { return m_timeFlags; }
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static const MediaTime& zeroTime();
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static const MediaTime& invalidTime();
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static const MediaTime& positiveInfiniteTime();
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static const MediaTime& negativeInfiniteTime();
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static const MediaTime& indefiniteTime();
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const int64_t& timeValue() const { return m_timeValue; }
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const uint32_t& timeScale() const { return m_timeScale; }
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void dump(PrintStream& out) const;
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String toString() const;
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String toJSONString() const;
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Ref<JSON::Object> toJSONObject() const;
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// Make the following casts errors:
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operator double() const = delete;
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MediaTime(double) = delete;
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operator int() const = delete;
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MediaTime(int) = delete;
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friend WTF_EXPORT_PRIVATE MediaTime abs(const MediaTime& rhs);
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static const uint32_t DefaultTimeScale = 10000000;
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static const uint32_t MaximumTimeScale;
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enum class RoundingFlags {
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HalfAwayFromZero = 0,
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TowardZero,
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AwayFromZero,
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TowardPositiveInfinity,
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TowardNegativeInfinity,
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};
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MediaTime toTimeScale(uint32_t, RoundingFlags = RoundingFlags::HalfAwayFromZero) const;
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template<class Encoder> void encode(Encoder&) const;
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template<class Decoder> static WARN_UNUSED_RETURN bool decode(Decoder&, MediaTime&);
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private:
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void setTimeScale(uint32_t, RoundingFlags = RoundingFlags::HalfAwayFromZero);
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union {
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int64_t m_timeValue;
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double m_timeValueAsDouble;
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};
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uint32_t m_timeScale;
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uint8_t m_timeFlags;
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};
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constexpr MediaTime::MediaTime()
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: m_timeValue(0)
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, m_timeScale(DefaultTimeScale)
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, m_timeFlags(Valid)
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{
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}
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constexpr MediaTime::MediaTime(int64_t value, uint32_t scale, uint8_t flags)
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: m_timeValue(value)
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, m_timeScale(scale)
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, m_timeFlags(flags)
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{
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if (scale || !(flags & Valid))
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return;
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*this = value < 0 ? negativeInfiniteTime() : positiveInfiniteTime();
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}
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inline MediaTime operator*(int32_t lhs, const MediaTime& rhs) { return rhs.operator*(lhs); }
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WTF_EXPORT_PRIVATE extern MediaTime abs(const MediaTime& rhs);
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struct WTF_EXPORT_PRIVATE MediaTimeRange {
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WTF_MAKE_STRUCT_FAST_ALLOCATED;
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String toJSONString() const;
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const MediaTime start;
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const MediaTime end;
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};
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template<class Encoder>
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void MediaTime::encode(Encoder& encoder) const
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{
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encoder << m_timeValue << m_timeScale << m_timeFlags;
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}
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template<class Decoder>
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bool MediaTime::decode(Decoder& decoder, MediaTime& time)
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{
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return decoder.decode(time.m_timeValue)
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&& decoder.decode(time.m_timeScale)
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&& decoder.decode(time.m_timeFlags);
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}
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template<typename> struct LogArgument;
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template<> struct LogArgument<MediaTime> {
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static String toString(const MediaTime& time) { return time.toJSONString(); }
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};
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template<> struct LogArgument<MediaTimeRange> {
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static String toString(const MediaTimeRange& range) { return range.toJSONString(); }
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};
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#ifndef NDEBUG
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WTF_EXPORT_PRIVATE TextStream& operator<<(TextStream&, const MediaTime&);
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#endif
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}
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using WTF::MediaTime;
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using WTF::MediaTimeRange;
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using WTF::abs;
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