Method find_intersecting_clips

src/Timeline.cpp:1138–1185

Find intersecting clips (or non intersecting clips)

// Find intersecting clips (or non intersecting clips)
std::vector<Clip*> Timeline::find_intersecting_clips(int64_t requested_frame, int number_of_frames, bool include)
{
	// Find matching clips
	std::vector<Clip*> matching_clips;

	// Calculate time of frame
	const int64_t min_requested_frame = requested_frame;
	const int64_t max_requested_frame = requested_frame + (number_of_frames - 1);

	// Find Clips at this time
	matching_clips.reserve(clips.size());
	const double fpsD = info.fps.ToDouble();
	for (auto clip : clips)
	{
		// Does clip intersect the current requested time
		int64_t clip_start_position = static_cast<int64_t>(std::llround(clip->Position() * fpsD)) + 1;
		int64_t clip_end_position   = static_cast<int64_t>(std::llround((clip->Position() + clip->Duration()) * fpsD)) + 1;

		bool does_clip_intersect =
				(clip_start_position <= min_requested_frame || clip_start_position <= max_requested_frame) &&
				(clip_end_position >= min_requested_frame || clip_end_position >= max_requested_frame);

		// Debug output
		ZmqLogger::Instance()->AppendDebugMethod(
			"Timeline::find_intersecting_clips (Is clip near or intersecting)",
			"requested_frame", requested_frame,
			"min_requested_frame", min_requested_frame,
			"max_requested_frame", max_requested_frame,
			"clip->Position()", clip->Position(),
			"does_clip_intersect", does_clip_intersect);

		// Open (or schedule for closing) this clip, based on if it's intersecting or not
		update_open_clips(clip, does_clip_intersect);

		// Clip is visible
		if (does_clip_intersect && include)
			// Add the intersecting clip
			matching_clips.push_back(clip);

		else if (!does_clip_intersect && !include)
			// Add the non-intersecting clip
			matching_clips.push_back(clip);

	} // end clip loop

	// return list
	return matching_clips;
}

// Set the cache object used by this reader
void Timeline::SetCache(CacheBase* new_cache) {