/// <summary>
/// Default constructor
/// </summary>
public ISMVTrackFormat()
{
this.CurrentFragment = null;
fragSequenceNum = 1;
}
public void Write(TextWriter ISM, string inOrigISMCDir, string inName, ISMCFile ismc)
{
string tmpRate = _bitrate.ToString();
tmpRate = tmpRate.Substring(0, tmpRate.Length - 3);
if (_fragmentType == MP4.FragmentType.Video)
ISM.WriteLine(" <video");
else if (_fragmentType == MP4.FragmentType.Audio)
ISM.WriteLine(" <audio");
else return;
ISM.WriteLine(" src=\"" + inName + "_" + tmpRate + ".ismv\"");
ISM.WriteLine(" systemBitrate=\"" + _bitrate + "\">");
if (ismc == null)
{
ISM.WriteLine(" <param");
ISM.WriteLine(" name=\"trackID\"");
ISM.WriteLine(" value=\"2\"");
ISM.WriteLine(" valuetype=\"data\" />");
}
else
{
ISM.WriteLine(" <param");
ISM.WriteLine(" name=\"trackID\"");
ISM.WriteLine(" value=\"2\"");
ISM.WriteLine(" valuetype=\"data\"");
ISM.Write(" chunks=\"");
// Console.WriteLine("Video Bitrate: " + vid.systemBitrate);
ISMVFile vfile = new ISMVFile(inOrigISMCDir, _source);
string chunkData = "";
int chunkId = 0;
ulong currTime = 0;
Fragment frag = new Fragment();
foreach (c cidx in ismc.indexs[0].cs)
{
ulong ChunkStart = 0;
ulong ChunkLen = 0;
// need to fix this line vfile.GetFragmentPosition(currTime, 2, out ChunkStart, out ChunkLen);
currTime += ulong.Parse(cidx.d);
chunkId++;
// Console.WriteLine(" ChunkStart: " + ChunkStart + " ChunkLen: " + ChunkLen);
chunkData += ChunkStart + "-" + ChunkLen + ",";
ISM.Write(chunkData);
}
ISM.WriteLine("\">");
ChunkInfo[_bitrate.ToString()] = chunkData;
}
if (_fragmentType == MP4.FragmentType.Video)
ISM.WriteLine(" </video>");
else if (_fragmentType == MP4.FragmentType.Audio)
ISM.WriteLine(" </audio>");
}
// assumption: this can ONLY be called when we know the next box is a fragment...
private void ScanForAudioOrVideo()
{
long pos = boxReader.BaseStream.Position;
do
{
long fragPos = boxReader.BaseStream.Position;
Fragment frag = new Fragment();
int trakID = (int)frag.GetMP4TrackID(boxReader);
if (GetFragmentHandlerType(trakID) == _handlerType)
{
if (_handlerType.Equals("soun"))
{
nextAudioFragPosition = fragPos;
audioTrackID = trakID;
}
else if (_handlerType.Equals("vide"))
{
nextVideoFragPosition = fragPos;
videoTrackID = trakID;
}
break;
}
} while (this.boxReader.PeekNextBoxType() == BoxTypes.MovieFragment);
boxReader.BaseStream.Position = pos;
audiovideoScanCompleted = true;
}
/// <summary>
/// Read
/// Everytime we get here and base.Read() is called, a new fragment is created and becomes CurrentFragment of MP4TrackFormat.
/// For a fragmented file, the first 'read' will really just scan for if there is sourceAudio and/or sourceVideo
/// and set positions for the start of each type of fragment, prepping for another read to actually find the
/// sourceAudio and sourceVideo fragment.
/// </summary>
public void Read()
{
if (!audiovideoScanCompleted)
{
ReadMP4Headers();
if (mmb == null) throw new Exception("Moov box must come before moof");
ScanForAudioOrVideo();
}
// read only one fragment at a time into each trakBx
{
// this means we have already done prep work, etc. and now all we care about are fragments in
// non-linear order...
bool moreFragments = false;
CurrentFragment = null; // we're done with the current fragment, get rid of it
foreach (TrackBox trakBx in mmb.TrackBoxes)
{
string handler = trakBx.MediaBox.HandlerReferenceBox.HandlerType;
if ((handler != null) && (handler.Equals(_handlerType)))
{
if (handler == "soun")
{
CurrentFragment = GetNextAudioFrag();
}
else if (handler == "vide")
{
CurrentFragment = GetNextVideoFrag();
}
moreFragments |= (CurrentFragment != null);
ulong oneSecondTicks = (ulong)TimeSpan.FromSeconds(1.0).Ticks;
if (CurrentFragment != null)
FragmentDuration = (ulong)((CurrentFragment.Duration * oneSecondTicks) / trakBx.MediaBox.MediaHeaderBox.TimeScale);
}
}
//if (!moreFragments)
// base.EOF = true; // end of file
}
}
/// <summary>
/// PrepareSampleWriting
/// Do not call the base method from here because fragment processing is separate from moov box processing.
/// </summary>
/// <param name="streamLocations"></param>
/// <param name="currMdatOffset"></param>
public override void PrepareSampleWriting(List<StreamDataBlockInfo> streamLocations, ref ulong currMdatOffset)
{
if (this.CurrentFragment != null)
throw new Exception("CurrentFragment must be null when ISMVTrackFormat.PrepareSampleWriting is entered");
// prepare parameters for creating a fragment
// our output will always use track ID 1 for audio
//uint trackID = (uint)((streamLocations[0].SampleType == SampleType.MP4A || streamLocations[0].SampleType == SampleType.WMA) ? 1 : 2);
//uint trackID = (uint)(IsAudio(streamLocations[0].SampleType) ? 1 : 2);
// this is what fragment run flags should be for ISMV file output
// FIXME: this is adhoc, need to figure out exactly which bits are correct for these flags
uint fragmentRunFlags;
uint defaultSampleFlags;
if (IsAudio(streamLocations[0].SliceType)) {
fragmentRunFlags = (uint)0x301; // magic number for audio
defaultSampleFlags = (uint)0x8002;
} else {
fragmentRunFlags = (uint)0xb05; // magic number for video
defaultSampleFlags = (uint)0x4001;
}
// for audio, all samples are of the same size
uint sampleSize = (IsAudio(streamLocations[0].SliceType)) ? (uint)streamLocations[0].SliceSize : 0;
// first, create the fragment boxes
CurrentFragment = new Fragment(fragSequenceNum, base.TrackID, streamLocations.Count, fragmentRunFlags, defaultSampleFlags, sampleSize);
if (CurrentFragment.Duration != _ismElement.FragmentDurations[(int)fragSequenceNum])
throw new Exception("ISMVTrackFormat: mismatch in fragment duration between ISMC file and MP4");
currMdatOffset += this.CurrentFragment.DataOffset;
fragSequenceNum++;
// now prepare the samples in this fragment, without copying the sample bits
this.CurrentFragment.AddSampleStream(streamLocations, base.TimeScale, ref currMdatOffset);
}
private Fragment GetNextVideoFrag()
{
if (nextVideoFragPosition < 0) return (null); // there are no more!!
boxReader.BaseStream.Position = nextVideoFragPosition;
// we know where at least the next frag is as we prepared this prior to the call of this function...
Fragment answer = new Fragment(GetTimeScale(videoTrackID), GetPayloadType(videoTrackID));
answer.Read(boxReader);
nextVideoFragPosition = -1;
while (this.boxReader.PeekNextBoxType() == BoxTypes.MovieFragment)
{
long fragPos = boxReader.BaseStream.Position;
Fragment tmp = new Fragment();
int trakID = (int)tmp.GetTrackID(boxReader);
if (GetFragmentHandlerType(trakID) == "vide")
{
nextVideoFragPosition = fragPos;
break;
}
}
return (answer);
}
private Fragment GetNextVideoFrag()
{
if (nextVideoFragPosition < 0) return (null); // there are no more!!
boxReader.BaseStream.Position = nextVideoFragPosition;
// we know where at least the next frag is as we prepared this prior to the call of this function...
Fragment answer = new Fragment(GetTimeScale(videoTrackID), GetPayloadType(videoTrackID), runningTimeIn100NanoSecs, runningSliceIndex);
answer.Read(boxReader);
runningTimeIn100NanoSecs += (ulong)TimeArithmetic.ConvertToStandardUnit(answer.TimeScale, (decimal)answer.Duration);
runningSliceIndex += answer.Length;
nextVideoFragPosition = -1;
while (this.boxReader.PeekNextBoxType() == BoxTypes.MovieFragment)
{
long fragPos = boxReader.BaseStream.Position;
Fragment tmp = new Fragment();
int trakID = (int)tmp.GetMP4TrackID(boxReader);
if (GetFragmentHandlerType(trakID) == "vide")
{
nextVideoFragPosition = fragPos;
break;
}
}
return (answer);
}
