/// <summary>
/// actually write a packet to file
/// timestamp sequence must be nondecreasing
/// </summary>
void writeActual(JmdPacket j)
{
if (j.Timestamp < _timestampOff)
{
throw new ArithmeticException("JMD Timestamp problem?");
}
UInt64 timestampout = j.Timestamp - _timestampOff;
while (timestampout > 0xffffffff)
{
timestampout -= 0xffffffff;
// write timestamp skipper
for (int i = 0; i < 6; i++)
{
_f.WriteByte(0xff);
}
}
_timestampOff = j.Timestamp;
WriteBe16(j.Stream);
writeBE32((UInt32)timestampout);
_f.WriteByte(j.Subtype);
writeVar((UInt64)j.Data.LongLength);
_f.Write(j.Data, 0, j.Data.Length);
}
/// <summary>
/// actually write a packet to file
/// timestamp sequence must be non-decreasing
/// </summary>
private void WriteActual(JmdPacket j)
{
if (j.Timestamp < _timestampOff)
{
throw new ArithmeticException("JMD Timestamp problem?");
}
var timeStampOut = j.Timestamp - _timestampOff;
while (timeStampOut > 0xffffffff)
{
timeStampOut -= 0xffffffff;
// write timestamp skipper
for (int i = 0; i < 6; i++)
{
_f.WriteByte(0xff);
}
}
_timestampOff = j.Timestamp;
WriteBe16(j.Stream);
WriteBe32((uint)timeStampOut);
_f.WriteByte(j.Subtype);
WriteVar((ulong)j.Data.LongLength);
_f.Write(j.Data, 0, j.Data.Length);
}
/// <summary>
/// assemble JMDPacket and send to packetqueue
/// </summary>
/// <param name="source">zlibed frame with width and height prepended</param>
public void AddVideo(byte[] source)
{
var j = new JmdPacket();
j.Stream = 0;
j.Subtype = 1; // zlib compressed, other possibility is 0 = uncompressed
j.Data = source;
j.Timestamp = timestampcalc(_fpsNum, _fpsDen, (UInt64)_totalFrames);
_totalFrames++;
WriteVideo(j);
}
/// <summary>
/// assemble JMDPacket and send to PacketQueue
/// </summary>
/// <param name="source">zlibed frame with width and height prepended</param>
public void AddVideo(byte[] source)
{
var j = new JmdPacket
{
Stream = 0,
Subtype = 1, // zlib compressed, other possibility is 0 = uncompressed
Data = source,
Timestamp = TimestampCalc(_fpsNum, _fpsDen, _totalFrames)
};
_totalFrames++;
WriteVideo(j);
}
// add a video packet to the file write queue
// will be written when order-appropriate wrt audio
// the video packets added must be internally ordered (but need not match audio order)
private void WriteVideo(JmdPacket j)
{
while (_audioStorage.Count > 0)
{
var p = _audioStorage.Peek();
if (p.Timestamp <= j.Timestamp)
{
writeActual(_audioStorage.Dequeue());
}
else
{
break;
}
}
_videoStorage.Enqueue(j);
}
/// <summary>
/// helper function makes a JMDPacket out of one sample pair and adds it to the order queue
/// </summary>
/// <param name="l">left sample</param>
/// <param name="r">right sample</param>
void doaudiopacket(short l, short r)
{
var j = new JmdPacket();
j.Stream = 1;
j.Subtype = 1; // raw PCM audio
j.Data = new byte[4];
j.Data[0] = (byte)(l >> 8);
j.Data[1] = (byte)(l & 255);
j.Data[2] = (byte)(r >> 8);
j.Data[3] = (byte)(r & 255);
j.Timestamp = timestampcalc(_audioSamplerate, 1, _totalSamples);
_totalSamples++;
WriteSound(j);
}
/// <summary>
/// helper function makes a JMDPacket out of one sample pair and adds it to the order queue
/// </summary>
/// <param name="l">left sample</param>
/// <param name="r">right sample</param>
private void DoAudioPacket(short l, short r)
{
var j = new JmdPacket
{
Stream = 1,
Subtype = 1, // raw PCM audio
Data = new byte[4]
};
j.Data[0] = (byte)(l >> 8);
j.Data[1] = (byte)(l & 255);
j.Data[2] = (byte)(r >> 8);
j.Data[3] = (byte)(r & 255);
j.Timestamp = TimestampCalc(_audioSamplerate, 1, _totalSamples);
_totalSamples++;
WriteSound(j);
}
