/// <summary>
/// Constructor to use when building the box from scratch.
/// NOTE: We don't compute the Size of this box in this constructor.
/// The Size of this box is computed during FinalizeBox.
/// NOTE: The ordering of the sub-boxes is not determined in the constructor.
/// Writing out the sub-boxes (see the Write method below) determines the order of sub-boxes.
/// </summary>
/// <param name="inParent">MediaInformationBox</param>
/// <param name="trackInfo">IsochronousTrackInfo</param>
public SampleTableBox(MediaInformationBox inParent, IsochronousTrackInfo trackInfo)
: this(inParent)
{
CTTSOut = trackInfo.CTTSOut;
fragmented = trackInfo.IsFragment;
SampleDescriptionsBox = new SampleDescriptionsBox(this, trackInfo);
DecodingTimeToSampleBox = new DecodingTimeToSampleBox(this);
SampleToChunkBox = new SampleToChunkBox(this);
SampleSizeBox = new SampleSizeBox(this);
ChunkOffSetBox = new ChunkOffSetBox(this);
if ((trackInfo is RawVideoTrackInfo) && !fragmented)
{
SyncSampleMapBox = new SyncSampleMapBox();
//CompositionTimeToSample = new CompositionTimeToSample(this);
}
}
/// <summary>
/// Read - read in the SampleTableBox from the input MP4 file.
/// Sub-boxes can come in in any order.
/// </summary>
/// <param name="reader">BoxReader</param>
public override void Read(BoxReader reader)
{
using (new SizeChecker(this, reader)) {
base.Read(reader);
while (reader.BaseStream.Position < (long)(this.Size + this.Offset))
{
long pos = reader.BaseStream.Position;
Box test = new Box(BoxTypes.Any);
test.Read(reader);
reader.BaseStream.Position = pos;
if (test.Type == BoxTypes.TimeToSample)
{
this.DecodingTimeToSampleBox = new DecodingTimeToSampleBox(this);
DecodingTimeToSampleBox.Read(reader);
}
else if (test.Type == BoxTypes.CompositionOffset)
{
this.CompositionTimeToSample = new CompositionTimeToSample(this);
CompositionTimeToSample.Read(reader);
}
else if (test.Type == BoxTypes.SampleDescription)
{
this.SampleDescriptionsBox = new SampleDescriptionsBox(this);
SampleDescriptionsBox.Read(reader);
}
else if (test.Type == BoxTypes.SampleToChunk)
{
this.SampleToChunkBox = new SampleToChunkBox(this);
SampleToChunkBox.Read(reader);
}
else if (test.Type == BoxTypes.SampleSize)
{
this.SampleSizeBox = new SampleSizeBox(this);
SampleSizeBox.Read(reader);
}
else if (test.Type == BoxTypes.ChunkOffset) // FIXME: this can be a "co64" box
{
this.ChunkOffSetBox = new ChunkOffSetBox(this);
ChunkOffSetBox.Read(reader);
}
else if (test.Type == BoxTypes.SyncSampleMap)
{
this.SyncSampleMapBox = new SyncSampleMapBox();
SyncSampleMapBox.Read(reader);
}
else
{
reader.BaseStream.Position = (long)(test.Size + test.Offset); // skip unknown box
Debug.WriteLine(string.Format("Unknown box type {0} in SampleTableBox (stbl), skipped", test.Type.ToString()));
}
} // end of while
if (SampleToChunkBox != null)
{
SampleToChunkBox.CheckIntegrityOfChunkData();
}
}
}
/// <summary>
/// InitSampleStreamFromSampleTableBox
/// The idea is to collect information on slices starting from startindex to endIndex.
/// This is a fairly complex method that traverses all boxes read from this SampleTableBox.
/// </summary>
/// <param name="sampleTimeScale">uint - sample time scale</param>
/// <param name="startIndex">int - start index</param>
/// <param name="endIndex">int - end index</param>
/// <param name="lastEnd">ref ulong</param>
/// <returns></returns>
public List <StreamDataBlockInfo> InitSampleStreamFromSampleTableBox(uint sampleTimeScale, int startIndex, int endIndex, ref ulong lastEnd)
{
List <StreamDataBlockInfo> SampleStreamLocations = new List <StreamDataBlockInfo>();
// local vars
DecodingTimeToSampleBox stts = this.DecodingTimeToSampleBox;
if (stts == null)
{
throw new Exception("SampleTableBox.DecodingTimeToSampleBox missing for track");
}
uint sampleCount = 0;
ulong timeT = 0;
ulong currScaledT = 0;
ulong prevScaledT = 0;
ulong endT = 0;
uint[] counts = stts.SampleCount;
uint[] deltaTimes = stts.SampleDelta;
ulong currOffset = 0UL;
SampleSizeBox stsz = this.SampleSizeBox;
uint sampleSize = stsz.SampleSize;
uint totalSamples = stsz.SampleCount;
uint[] sizeArray = stsz.SampleSizeArray;
int sampleCountInList = 0;
if ((this.SampleDescriptionsBox == null) || (this.SampleDescriptionsBox.EntryCount != 1))
{
throw new Exception("SampleTableBox.SampleDescriptionsBox error");
}
BoxType sampleDescriptionBoxType = this.SampleDescriptionsBox.Entries[0].Type;
// initialize (set) cttsIndex to the value that corresponds to startIndex
int k = 0;
int cttsIndex = 0;
if (CompositionTimeToSample != null && CompositionTimeToSample.EntryCount > 0)
{
int sliceIndex = 1;
while (cttsIndex < CompositionTimeToSample.SampleOffset.Length)
{
if (sliceIndex == startIndex)
{
break;
}
k++;
if (k == CompositionTimeToSample.SampleCount[cttsIndex])
{
k = 0; // begin counting from zero again
cttsIndex++;
}
sliceIndex++;
}
}
for (int i = 0; i < stts.EntryCount; i++)
{
for (int j = 0; j < counts[i]; j++)
{
currScaledT = (ulong)((timeT * (ulong)TimeSpan.FromSeconds(1.0).Ticks) / sampleTimeScale);
if ((sampleCount + 1 >= startIndex) && (sampleCount + 1 <= endIndex))
{
StreamDataBlockInfo data = new StreamDataBlockInfo();
data.index = (int)sampleCount;
data.TimeStampNew = currScaledT;
data.SliceDuration = (uint)((deltaTimes[i] * TimeSpan.TicksPerSecond) / sampleTimeScale) + 1;
data.SliceSize = (int)sampleSize;
if (sampleSize == 0)
{
data.SliceSize = (int)sizeArray[sampleCount];
}
data.StreamOffset = (ulong)this.SampleToChunkBox.GetFileOffset((uint)(sampleCount + 1));
data.SliceType = sampleDescriptionBoxType == BoxTypes.Mp4a ? SliceType.MP4A :
((this.SyncSampleMapBox == null) || this.SyncSampleMapBox.IsIFrame(sampleCount + 1) ? SliceType.IFrame : SliceType.DFrame);
// if necessary, increment cttsIndex
if (CompositionTimeToSample != null && CompositionTimeToSample.EntryCount > 0)
{
k++;
data.NonQuickTimeCTTS = CompositionTimeToSample.SampleOffset[cttsIndex];
if (k == CompositionTimeToSample.SampleCount[cttsIndex])
{
k = 0; // begin counting from zero again
cttsIndex++;
}
}
SampleStreamLocations.Add(data);
sampleCountInList++;
}
if (sampleCount + 1 > endIndex)
{
endT = prevScaledT;
break;
} // close of if (currScaledT > endTimeJustBeforeIFrame)
// keep track of offset
if (sampleSize > 0)
{
currOffset += sampleSize;
}
else
{
if (sampleCount > totalSamples)
{
throw new Exception("SampleTableBox error: sample count inconsistency bet. stts and stsz");
}
currOffset += sizeArray[sampleCount];
}
prevScaledT = currScaledT;
timeT += deltaTimes[i];
sampleCount++;
} // end of for j
if (endT > 0UL) // end sample found
{
break;
}
} // end of for i
if (endT == 0UL) // if we did not find end, endTime would not be set
{
lastEnd = currScaledT;
}
else
{
lastEnd = endT;
}
return(SampleStreamLocations);
}
/// <summary>
/// GetStartAndEndIndex
/// Given a start time and an end time, determine the start slice index and end slice index.
/// </summary>
/// <param name="edtsBox"EditsBox></param>
/// <param name="sampleTimeScale">uint - sample time scale</param>
/// <param name="startTime">ulong - start time</param>
/// <param name="endTime">ulong - end time</param>
/// <param name="startIndex">out param: start index</param>
/// <param name="endIndex">out param: end index</param>
private void GetStartAndEndIndex(EdtsBox edtsBox, uint sampleTimeScale, ulong startTime, ulong endTime, out uint startIndex, out uint endIndex)
{
startIndex = 0;
endIndex = 0;
ulong ticksDuration = (ulong)TimeArithmetic.ConvertToStandardUnit(sampleTimeScale, parent.parent.MediaHeaderBox.Duration);
if (edtsBox != null)
{
ticksDuration = (ulong)(edtsBox.GetEditTrackDuration(sampleTimeScale) * (decimal)TimeSpan.TicksPerSecond);
}
if (ticksDuration < startTime)
{
return;
}
DecodingTimeToSampleBox stts = this.DecodingTimeToSampleBox;
SyncSampleMapBox stss = this.SyncSampleMapBox;
uint sampleCount = 0;
ulong timeT = 0;
ulong currScaledT = 0;
ulong prevScaledT = 0;
uint[] counts = stts.SampleCount;
uint[] deltaTimes = stts.SampleDelta;
bool startSet = false;
for (int i = 0; i < stts.EntryCount; i++)
{
for (int j = 0; j < counts[i]; j++)
{
if ((currScaledT >= startTime) && (!startSet) && ((stss == null) || (stss.IsIFrame(sampleCount + 1))))
{
startSet = true;
startIndex = sampleCount + 1;
}
if (((stss == null) || stss.IsIFrame(sampleCount + 2)) && (currScaledT > endTime))
{
endIndex = sampleCount + 1;
break;
} // close of if (currScaledT > endTime)
prevScaledT = currScaledT;
timeT += deltaTimes[i];
sampleCount++;
currScaledT = (ulong)TimeArithmetic.ConvertToStandardUnit(sampleTimeScale, timeT);
} // end of for j
if (endIndex > 0) // end sample found
{
break;
}
} // end of for i
if ((endIndex == 0) && startSet) // end sample not found
{
endIndex = sampleCount + 1;
}
}
/// <summary>
/// Constructor to use when building the box from scratch.
/// NOTE: We don't compute the Size of this box in this constructor.
/// The Size of this box is computed during FinalizeBox.
/// NOTE: The ordering of the sub-boxes is not determined in the constructor.
/// Writing out the sub-boxes (see the Write method below) determines the order of sub-boxes.
/// </summary>
/// <param name="inParent">MediaInformationBox</param>
/// <param name="trackInfo">IsochronousTrackInfo</param>
public SampleTableBox(MediaInformationBox inParent, IsochronousTrackInfo trackInfo)
: this(inParent)
{
CTTSOut = trackInfo.CTTSOut;
fragmented = trackInfo.IsFragment;
SampleDescriptionsBox = new SampleDescriptionsBox(this, trackInfo);
DecodingTimeToSampleBox = new DecodingTimeToSampleBox(this);
SampleToChunkBox = new SampleToChunkBox(this);
SampleSizeBox = new SampleSizeBox(this);
ChunkOffSetBox = new ChunkOffSetBox(this);
if ((trackInfo is RawVideoTrackInfo) && !fragmented)
{
SyncSampleMapBox = new SyncSampleMapBox();
//CompositionTimeToSample = new CompositionTimeToSample(this);
}
}
/// <summary>
/// Read - read in the SampleTableBox from the input MP4 file.
/// Sub-boxes can come in in any order.
/// </summary>
/// <param name="reader">BoxReader</param>
public override void Read(BoxReader reader)
{
using (new SizeChecker(this, reader)) {
base.Read(reader);
while (reader.BaseStream.Position < (long)(this.Size + this.Offset)) {
long pos = reader.BaseStream.Position;
Box test = new Box(BoxTypes.Any);
test.Read(reader);
reader.BaseStream.Position = pos;
if (test.Type == BoxTypes.TimeToSample) {
this.DecodingTimeToSampleBox = new DecodingTimeToSampleBox(this);
DecodingTimeToSampleBox.Read(reader);
}
else if (test.Type == BoxTypes.CompositionOffset) {
this.CompositionTimeToSample = new CompositionTimeToSample(this);
CompositionTimeToSample.Read(reader);
}
else if (test.Type == BoxTypes.SampleDescription) {
this.SampleDescriptionsBox = new SampleDescriptionsBox(this);
SampleDescriptionsBox.Read(reader);
}
else if (test.Type == BoxTypes.SampleToChunk) {
this.SampleToChunkBox = new SampleToChunkBox(this);
SampleToChunkBox.Read(reader);
}
else if (test.Type == BoxTypes.SampleSize) {
this.SampleSizeBox = new SampleSizeBox(this);
SampleSizeBox.Read(reader);
}
else if (test.Type == BoxTypes.ChunkOffset) { // FIXME: this can be a "co64" box
this.ChunkOffSetBox = new ChunkOffSetBox(this);
ChunkOffSetBox.Read(reader);
}
else if (test.Type == BoxTypes.SyncSampleMap)
{
this.SyncSampleMapBox = new SyncSampleMapBox();
SyncSampleMapBox.Read(reader);
}
else
{
reader.BaseStream.Position = (long)(test.Size + test.Offset); // skip unknown box
Debug.WriteLine(string.Format("Unknown box type {0} in SampleTableBox (stbl), skipped", test.Type.ToString()));
}
} // end of while
if (SampleToChunkBox != null)
SampleToChunkBox.CheckIntegrityOfChunkData();
}
}
