/// <summary>
/// Internally append this slice (which must be allocated from our free buffer); this does the work
/// of coalescing, updating _data and other fields, etc.
/// </summary>
Slice <TTime, TValue> InternalAppend(Slice <TTime, TValue> dest)
{
// dest must be from our free buffer
HoloDebug.Assert(dest.Buffer.Data == _remainingFreeBuffer.Buffer.Data);
if (_data.Count == 0)
{
_data.Add(new TimedSlice <TTime, TValue>(InitialTime, dest));
}
else
{
TimedSlice <TTime, TValue> last = _data[_data.Count - 1];
if (last.Slice.Precedes(dest))
{
_data[_data.Count - 1] = new TimedSlice <TTime, TValue>(last.InitialTime, last.Slice.UnionWith(dest));
}
else
{
Spam.Audio.WriteLine("BufferedSliceStream.InternalAppend: last did not precede; last slice is " + last.Slice + ", last slice time " + last.InitialTime + ", dest is " + dest);
_data.Add(new TimedSlice <TTime, TValue>(last.InitialTime + last.Slice.Duration, dest));
}
}
_discreteDuration += dest.Duration;
_remainingFreeBuffer = _remainingFreeBuffer.SubsliceStartingAt(dest.Duration);
return(dest);
}
/// <summary>
/// Append this slice's data, by copying it into this stream's private buffers.
/// </summary>
public override void Append(Slice <TTime, TValue> source)
{
HoloDebug.Assert(!IsShut);
// Try to keep copying source into _remainingFreeBuffer
while (!source.IsEmpty())
{
EnsureFreeBuffer();
// if source is larger than available free buffer, then we'll iterate
Slice <TTime, TValue> originalSource = source;
if (source.Duration > _remainingFreeBuffer.Duration)
{
source = source.Subslice(0, _remainingFreeBuffer.Duration);
}
// now we know source can fit
Slice <TTime, TValue> dest = _remainingFreeBuffer.SubsliceOfDuration(source.Duration);
source.CopyTo(dest);
// dest may well be adjacent to the previous slice, if there is one, since we may
// be appending onto an open chunk. So here is where we coalesce this, if so.
dest = InternalAppend(dest);
// and update our loop variables
source = originalSource.SubsliceStartingAt(source.Duration);
Trim();
}
}
/// <summary>
/// Copy strided data from a source array into a single destination sliver.
/// </summary>
public override void AppendSliver(TValue[] source, int startOffset, int width, int stride, int height)
{
HoloDebug.Assert(source != null);
int neededLength = startOffset + stride * (height - 1) + width;
HoloDebug.Assert(source.Length >= neededLength);
HoloDebug.Assert(SliverSize == width * height);
HoloDebug.Assert(stride >= width);
EnsureFreeBuffer();
Slice <TTime, TValue> destination = _remainingFreeBuffer.SubsliceOfDuration(1);
int sourceOffset = startOffset;
int destinationOffset = 0;
for (int h = 0; h < height; h++)
{
destination.CopyFrom(source, sourceOffset, destinationOffset, width);
sourceOffset += stride;
destinationOffset += width;
}
InternalAppend(destination);
Trim();
}
public Interval(Time <TTime> initialTime, Duration <TTime> duration)
{
HoloDebug.Assert(duration >= 0);
InitialTime = initialTime;
Duration = duration;
_isInitialized = true;
}
/// <summary>
/// Append the given amount of data marshalled from the pointer P.
/// </summary>
public void Append(Time <TTime> absoluteTime, IntPtr p)
{
HoloDebug.Assert(!IsShut);
HoloDebug.Assert(TimeIsAfterLast(absoluteTime));
_innerStream.Append(1, p);
_times.Add(absoluteTime);
Trim();
}
/// <summary>
/// Shut the stream; no further appends may be accepted.
/// </summary>
/// <param name="finalDuration">The possibly fractional duration to be associated with the stream;
/// must be strictly equal to, or less than one sample smaller than, the discrete duration.</param>
public override void Shut(ContinuousDuration finalDuration)
{
HoloDebug.Assert(!IsShut);
// Should always have as many samples as the rounded-up finalDuration.
// The precise time matching behavior is that a loop will play either Math.Floor(finalDuration)
// or Math.Ceiling(finalDuration) samples on each iteration, such that it remains perfectly in
// time with finalDuration's fractional value. So, a shut loop should have DiscreteDuration
// equal to rounded-up ContinuousDuration.
HoloDebug.Assert((int)Math.Ceiling((double)finalDuration) == (int)DiscreteDuration);
base.Shut(finalDuration);
}
/// <summary>
/// Append this slice's data, by copying it into this stream's private buffers.
/// </summary>
public void Append(Time <TTime> absoluteTime, Slice <Frame, TValue> source)
{
HoloDebug.Assert(!IsShut);
HoloDebug.Assert(source.Duration == 1);
HoloDebug.Assert(TimeIsAfterLast(absoluteTime));
_innerStream.Append(source);
_times.Add(absoluteTime);
Trim();
}
public Slice(Buf <TValue> buffer, Duration <TTime> offset, Duration <TTime> duration, int sliverSize)
{
HoloDebug.Assert(buffer.Data != null);
HoloDebug.Assert(offset >= 0);
HoloDebug.Assert(duration >= 0);
HoloDebug.Assert((offset * sliverSize) + (duration * sliverSize) <= buffer.Data.Length);
_buffer = buffer;
_offset = offset;
Duration = duration;
SliverSize = sliverSize;
}
/// <summary>
/// Append the given amount of data marshalled from the pointer P.
/// </summary>
public override void Append(Duration <TTime> duration, IntPtr p)
{
HoloDebug.Assert(!IsShut);
while (duration > 0)
{
Slice <TTime, TValue> tempSlice = TempSlice(duration);
_copyIntPtrToSliceAction(p, tempSlice);
Append(tempSlice);
duration -= tempSlice.Duration;
}
_discreteDuration += duration;
}
public override Interval <TTime> MapNextSubInterval(Interval <TTime> input)
{
HoloDebug.Assert(input.InitialTime >= _stream.InitialTime);
Duration <TTime> inputDelayDuration = input.InitialTime - _stream.InitialTime;
// now we want to take that modulo the *discrete* duration
inputDelayDuration %= _stream.DiscreteDuration;
Duration <TTime> mappedDuration = Math.Min((long)input.Duration, (long)(_stream.DiscreteDuration - inputDelayDuration));
Interval <TTime> ret = new Interval <TTime>(_stream.InitialTime + inputDelayDuration, mappedDuration);
Spam.Audio.WriteLine("SimpleLoopingIntervalMapper.MapNextSubInterval: _stream " + _stream + ", input " + input + ", ret " + ret);
return(ret);
}
public void AppendSliver(Time <TTime> absoluteTime, TValue[] source, int startOffset, int width, int stride, int height)
{
HoloDebug.Assert(!IsShut);
if (_times.Count > 0 && _times[_times.Count - 1] == absoluteTime)
{
// BUGBUG? Is this a sign of major slowdown?
return;
}
HoloDebug.Assert(TimeIsAfterLast(absoluteTime));
_innerStream.AppendSliver(source, startOffset, width, stride, height);
_times.Add(absoluteTime);
Trim();
}
/// <summary>
/// Trim off any content beyond the maximum allowed to be buffered.
/// </summary>
/// <remarks>
/// Internal because wrapper streams want to delegate to this when they are themselves Trimmed.</remarks>
void Trim()
{
if (_maxBufferedDuration == 0 || _discreteDuration <= _maxBufferedDuration)
{
return;
}
while (DiscreteDuration > _maxBufferedDuration)
{
Duration <TTime> toTrim = DiscreteDuration - _maxBufferedDuration;
// get the first slice
TimedSlice <TTime, TValue> firstSlice = _data[0];
if (firstSlice.Slice.Duration <= toTrim)
{
_data.RemoveAt(0);
#if DEBUG
// check to make sure our later stream data doesn't reference this one we're about to free
foreach (TimedSlice <TTime, TValue> slice in _data)
{
HoloDebug.Assert(slice.Slice.Buffer.Data != firstSlice.Slice.Buffer.Data);
}
#endif
_allocator.Free(firstSlice.Slice.Buffer);
_discreteDuration -= firstSlice.Slice.Duration;
_initialTime += firstSlice.Slice.Duration;
}
else
{
TimedSlice <TTime, TValue> newFirstSlice = new TimedSlice <TTime, TValue>(
firstSlice.InitialTime + toTrim,
new Slice <TTime, TValue>(
firstSlice.Slice.Buffer,
firstSlice.Slice.Offset + toTrim,
firstSlice.Slice.Duration - toTrim,
SliverSize));
_data[0] = newFirstSlice;
_discreteDuration -= toTrim;
_initialTime += toTrim;
}
}
}
/// <summary>
/// Map the interval time to stream local time, and get the next slice of it.
/// </summary>
/// <param name="interval"></param>
/// <returns></returns>
public override Slice <TTime, TValue> GetNextSliceAt(Interval <TTime> interval)
{
Interval <TTime> firstMappedInterval = _intervalMapper.MapNextSubInterval(interval);
if (firstMappedInterval.IsEmpty)
{
return(Slice <TTime, TValue> .Empty);
}
HoloDebug.Assert(firstMappedInterval.InitialTime >= InitialTime);
HoloDebug.Assert(firstMappedInterval.InitialTime + firstMappedInterval.Duration <= InitialTime + DiscreteDuration);
TimedSlice <TTime, TValue> foundTimedSlice = GetInitialTimedSlice(firstMappedInterval);
Interval <TTime> intersection = foundTimedSlice.Interval.Intersect(firstMappedInterval);
HoloDebug.Assert(!intersection.IsEmpty);
Slice <TTime, TValue> ret = foundTimedSlice.Slice.Subslice(
intersection.InitialTime - foundTimedSlice.InitialTime,
intersection.Duration);
return(ret);
}
TimedSlice <TTime, TValue> GetInitialTimedSlice(Interval <TTime> firstMappedInterval)
{
// we must overlap somewhere
HoloDebug.Assert(!firstMappedInterval.Intersect(new Interval <TTime>(InitialTime, DiscreteDuration)).IsEmpty);
// Get the biggest available slice at firstMappedInterval.InitialTime.
// First, get the index of the slice just after the one we want.
TimedSlice <TTime, TValue> target = new TimedSlice <TTime, TValue>(firstMappedInterval.InitialTime, Slice <TTime, TValue> .Empty);
int originalIndex = _data.BinarySearch(target, TimedSlice <TTime, TValue> .Comparer.Instance);
int index = originalIndex;
if (index < 0)
{
// index is then the index of the next larger element
// -- we know there is a smaller element because we know firstMappedInterval fits inside stream interval
index = (~index) - 1;
HoloDebug.Assert(index >= 0);
}
TimedSlice <TTime, TValue> foundTimedSlice = _data[index];
return(foundTimedSlice);
}
public Duration(long count)
{
HoloDebug.Assert(count >= 0);
_count = count;
}
/// <summary>Merge two adjacent samples into a single sample.</summary>
public Slice <TTime, TValue> UnionWith(Slice <TTime, TValue> next)
{
HoloDebug.Assert(Precedes(next));
return(new Slice <TTime, TValue>(_buffer, _offset, Duration + next.Duration, SliverSize));
}
/// <summary>
/// Shut the stream; no further appends may be accepted.
/// </summary>
/// <param name="finalDuration">The possibly fractional duration to be associated with the stream;
/// must be strictly equal to, or less than one sample smaller than, the discrete duration.</param>
public virtual void Shut(ContinuousDuration finalDuration)
{
HoloDebug.Assert(!IsShut);
_isShut = true;
_continuousDuration = finalDuration;
}
