/// <summary>
/// actually write a packet to file
/// timestamp sequence must be nondecreasing
/// </summary>
/// <param name="j"></param>
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>
/// 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>
/// 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)
/// </summary>
/// <param name="j"></param>
void writevideo(JMDPacket j)
{
while (astorage.Count > 0)
{
var p = astorage.Peek();
if (p.timestamp <= j.timestamp)
{
writeActual(astorage.Dequeue());
}
else
{
break;
}
}
vstorage.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>
/// 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)
/// </summary>
/// <param name="j"></param>
void writevideo(JMDPacket j)
{
while (astorage.Count > 0)
{
var p = astorage.Peek();
if (p.timestamp <= j.timestamp)
writeActual(astorage.Dequeue());
else
break;
}
vstorage.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>
/// 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>
/// actually write a packet to file
/// timestamp sequence must be nondecreasing
/// </summary>
/// <param name="j"></param>
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);
}
