PlatformTimeRanges.cpp [plain text]
#include "config.h"
#include "PlatformTimeRanges.h"
#include <math.h>
#include <wtf/PrintStream.h>
namespace WebCore {
PlatformTimeRanges::PlatformTimeRanges(const MediaTime& start, const MediaTime& end)
{
add(start, end);
}
void PlatformTimeRanges::invert()
{
PlatformTimeRanges inverted;
MediaTime posInf = MediaTime::positiveInfiniteTime();
MediaTime negInf = MediaTime::negativeInfiniteTime();
if (!m_ranges.size())
inverted.add(negInf, posInf);
else {
MediaTime start = m_ranges.first().m_start;
if (start != negInf)
inverted.add(negInf, start);
for (size_t index = 0; index + 1 < m_ranges.size(); ++index)
inverted.add(m_ranges[index].m_end, m_ranges[index + 1].m_start);
MediaTime end = m_ranges.last().m_end;
if (end != posInf)
inverted.add(end, posInf);
}
m_ranges.swap(inverted.m_ranges);
}
void PlatformTimeRanges::intersectWith(const PlatformTimeRanges& other)
{
PlatformTimeRanges invertedOther(other);
invertedOther.invert();
invert();
unionWith(invertedOther);
invert();
}
void PlatformTimeRanges::unionWith(const PlatformTimeRanges& other)
{
PlatformTimeRanges unioned(*this);
for (size_t index = 0; index < other.m_ranges.size(); ++index) {
const Range& range = other.m_ranges[index];
unioned.add(range.m_start, range.m_end);
}
m_ranges.swap(unioned.m_ranges);
}
MediaTime PlatformTimeRanges::start(unsigned index) const
{
bool ignoredValid;
return start(index, ignoredValid);
}
MediaTime PlatformTimeRanges::start(unsigned index, bool& valid) const
{
if (index >= length()) {
valid = false;
return MediaTime::zeroTime();
}
valid = true;
return m_ranges[index].m_start;
}
MediaTime PlatformTimeRanges::end(unsigned index) const
{
bool ignoredValid;
return end(index, ignoredValid);
}
MediaTime PlatformTimeRanges::end(unsigned index, bool& valid) const
{
if (index >= length()) {
valid = false;
return MediaTime::zeroTime();
}
valid = true;
return m_ranges[index].m_end;
}
MediaTime PlatformTimeRanges::duration(unsigned index) const
{
if (index >= length())
return MediaTime::invalidTime();
return m_ranges[index].m_end - m_ranges[index].m_start;
}
MediaTime PlatformTimeRanges::maximumBufferedTime() const
{
if (!length())
return MediaTime::invalidTime();
return m_ranges[length() - 1].m_end;
}
void PlatformTimeRanges::add(const MediaTime& start, const MediaTime& end)
{
ASSERT(start <= end);
unsigned overlappingArcIndex;
Range addedRange(start, end);
for (overlappingArcIndex = 0; overlappingArcIndex < m_ranges.size(); overlappingArcIndex++) {
if (addedRange.isOverlappingRange(m_ranges[overlappingArcIndex]) || addedRange.isContiguousWithRange(m_ranges[overlappingArcIndex])) {
addedRange = addedRange.unionWithOverlappingOrContiguousRange(m_ranges[overlappingArcIndex]);
m_ranges.remove(overlappingArcIndex);
overlappingArcIndex--;
} else {
if (!overlappingArcIndex) {
if (addedRange.isBeforeRange(m_ranges[0])) {
break;
}
} else {
if (m_ranges[overlappingArcIndex - 1].isBeforeRange(addedRange) && addedRange.isBeforeRange(m_ranges[overlappingArcIndex])) {
break;
}
}
}
}
m_ranges.insert(overlappingArcIndex, addedRange);
}
bool PlatformTimeRanges::contain(const MediaTime& time) const
{
return find(time) != notFound;
}
size_t PlatformTimeRanges::find(const MediaTime& time) const
{
bool ignoreInvalid;
for (unsigned n = 0; n < length(); n++) {
if (time >= start(n, ignoreInvalid) && time <= end(n, ignoreInvalid))
return n;
}
return notFound;
}
MediaTime PlatformTimeRanges::nearest(const MediaTime& time) const
{
MediaTime closestDelta = MediaTime::positiveInfiniteTime();
MediaTime closestTime = MediaTime::zeroTime();
unsigned count = length();
bool ignoreInvalid;
for (unsigned ndx = 0; ndx < count; ndx++) {
MediaTime startTime = start(ndx, ignoreInvalid);
MediaTime endTime = end(ndx, ignoreInvalid);
if (time >= startTime && time <= endTime)
return time;
MediaTime startTimeDelta = abs(startTime - time);
if (startTimeDelta < closestDelta) {
closestTime = startTime;
closestDelta = startTimeDelta;
}
MediaTime endTimeDelta = abs(endTime - time);
if (endTimeDelta < closestDelta) {
closestTime = endTime;
closestDelta = endTimeDelta;
}
}
return closestTime;
}
MediaTime PlatformTimeRanges::totalDuration() const
{
MediaTime total = MediaTime::zeroTime();
for (unsigned n = 0; n < length(); n++)
total += abs(end(n) - start(n));
return total;
}
void PlatformTimeRanges::dump(PrintStream& out) const
{
if (!length())
return;
for (size_t i = 0; i < length(); ++i)
out.print("[", start(i), "..", end(i), "] ");
}
}