Implements #196 stream capturing

This now allows all reconstruction streams to be recorded to file. Currently playback within reconstruct is not completed, although a separate player app is included.

applications/player/src/main.cpp

@@ -26,6 +26,17 @@ static void createDecoder(const ftl::codecs::Packet &pkt) {
 	decoder = ftl::codecs::allocateDecoder(pkt);
 }
 
+static void visualizeDepthMap(	const cv::Mat &depth, cv::Mat &out,
+								const float max_depth)
+{
+	depth.convertTo(out, CV_8U, 255.0f / max_depth);
+	out = 255 - out;
+	//cv::Mat mask = (depth >= 39.0f); // TODO (mask for invalid pixels)
+	
+	applyColorMap(out, out, cv::COLORMAP_JET);
+	//out.setTo(cv::Scalar(255, 255, 255), mask);
+}
+
 int main(int argc, char **argv) {
     std::string filename(argv[1]);
     LOG(INFO) << "Playing: " << filename;
@@ -72,6 +83,9 @@ int main(int argc, char **argv) {
             }
 
             if (!frame.empty()) {
+                if (spkt.channel == 1) {
+                    visualizeDepthMap(frame, frame, 8.0f);
+                }
                 double time = (double)(spkt.timestamp - r.getStartTime()) / 1000.0;
                 cv::putText(frame, std::string("Time: ") + std::to_string(time) + std::string("s"), cv::Point(10,20), cv::FONT_HERSHEY_PLAIN, 1, cv::Scalar(0,0,255));
                 cv::imshow("Player", frame);