Example #1
0
bool PacketBuffer::seekTo(double seek_pos, bool backwards)
{
	if (isEmpty())
		return true;

	if (backwards && at(0).ts > seek_pos)
	{
		if (floor(at(0).ts) > seek_pos)
			return false; //Brak paczek do skoku w tył
		seek_pos = at(0).ts;
	}

	double durationToChange = 0.0;
	qint64 sizeToChange = 0;

	if (!backwards) //Skok do przodu
	{
		const int count = packetsCount();
		for (int i = pos; i < count; ++i)
		{
			const Packet &pkt = at(i);
			if (pkt.ts < seek_pos || !pkt.hasKeyFrame)
			{
				durationToChange += pkt.duration;
				sizeToChange += pkt.size();
			}
			else
			{
				remaining_duration -= durationToChange;
				backward_duration += durationToChange;
				remaining_bytes -= sizeToChange;
				backward_bytes += sizeToChange;
				pos = i;
				return true;
			}
		}
	}
	else for (int i = pos - 1; i >= 0; --i) //Skok do tyłu
	{
		const Packet &pkt = at(i);
		durationToChange += pkt.duration;
		sizeToChange += pkt.size();
		if (pkt.hasKeyFrame && pkt.ts <= seek_pos)
		{
			remaining_duration += durationToChange;
			backward_duration -= durationToChange;
			remaining_bytes += sizeToChange;
			backward_bytes -= sizeToChange;
			pos = i;
			return true;
		}
	}

	return false;
}
Example #2
0
	inline int remainingPacketsCount() const
	{
		return packetsCount() - pos;
	}