internal SeiTiming(ref BitReader reader, ref TimingFormat timingFormat)
{
int cpb_removal_delay = 0, dpb_output_delay = 0;
if (timingFormat.cpbDpbDelaysPresent)
{
cpb_removal_delay = reader.readInt(timingFormat.cpbRemovalDelayLength);
dpb_output_delay = reader.readInt(timingFormat.dpbOutputDelayLength);
}
if (timingFormat.picStructPresent)
{
int picStruct = reader.readInt(4);
if (picStruct >= timestampsCountTable.Length)
{
throw new ArgumentException($"picStruct value { picStruct } is out of range, should be in [ 0 ..8 ] interval");
}
this.count = timestampsCountTable[picStruct];
int count = this.count;
for (int i = 0; i < count; i++)
{
timestamps[i] = parseTimestamp(ref reader, ref timingFormat);
}
}
else
{
count = 0;
}
}
internal sSeiMessage(ref BitReader reader, ref TimingFormat timingFormat)
{
uint tp = (uint)readInt(ref reader);
m_type = tp;
u = default;
payloadSize = readInt(ref reader);
if (getType(tp) == eSeiType.PicTiming)
{
u.timing = new SeiTiming(ref reader, ref timingFormat);
}
}
static long parseTimestamp(ref BitReader reader, ref TimingFormat timingFormat)
{
bool clock_timestamp_flag = reader.readBit();
if (!clock_timestamp_flag)
{
return(-1);
}
int ct_type = reader.readInt(2);
int nuit_field_based_flag = reader.readInt(1);
int counting_type = reader.readInt(5);
bool full_timestamp_flag = reader.readBit();
bool discontinuity_flag = reader.readBit();
bool cnt_dropped_flag = reader.readBit();
int n_frames = reader.readInt(8);
byte seconds = 0, minutes = 0, hours = 0;
if (full_timestamp_flag)
{
seconds = (byte)reader.readInt(6);
minutes = (byte)reader.readInt(6);
hours = (byte)reader.readInt(5);
}
else
{
if (reader.readBit())
{
// seconds_flag
seconds = (byte)reader.readInt(6);
if (reader.readBit())
{
// minutes_flag
minutes = (byte)reader.readInt(6);
if (reader.readBit())
{
// hours_flag
hours = (byte)reader.readInt(5);
}
}
}
}
int time_offset = 0;
if (timingFormat.timeOffsetLength > 0)
{
int tol = timingFormat.timeOffsetLength;
time_offset = reader.readInt(tol);
// Make it signed
if (0 != (time_offset & (1 << (tol - 1))))
{
time_offset -= (1 << tol);
}
}
// D.2.2 Picture timing SEI message semantics
// clockTimestamp = ( ( hH * 60 + mM ) * 60 + sS ) * time_scale + nFrames * ( num_units_in_tick * ( 1 + nuit_field_based_flag ) ) + tOffset
int totalSeconds = seconds + minutes * 60 + hours * 3600;
long result = (long)totalSeconds * timingFormat.timeScale;
result += n_frames * (timingFormat.numUnitsInTick * (nuit_field_based_flag + 1));
result += time_offset;
return(result);
}