Add channel_count to stream

applications/reconstruct/src/main.cpp

@@ -166,6 +166,8 @@ static void run(ftl::Configurable *root) {
 	ftl::codecs::Writer writer(fileout);
 	auto recorder = [&writer](ftl::rgbd::Source *src, const ftl::codecs::StreamPacket &spkt, const ftl::codecs::Packet &pkt) {
 		LOG(INFO) << "About to write";
+		// TODO: Patch spkt with correct streamID
+		// TODO: Also adapt timestamp inside writer to be file relative
 		writer.write(spkt, pkt);
 	};
 
@@ -180,6 +182,9 @@ static void run(ftl::Configurable *root) {
 			fileout.open(std::string(timestamp) + ".ftl");
 
 			writer.begin();
+
+			// TODO: Write pose+calibration packets
+
 			group.addRawCallback(std::function(recorder));
 		} else {
 			group.removeRawCallback(recorder);

components/codecs/include/ftl/codecs/packet.hpp

@@ -10,7 +10,9 @@
 namespace ftl {
 namespace codecs {
 
-
+/**
+ * First bytes of our file format.
+ */
 struct Header {
 	const char magic[4] = {'F','T','L','F'};
 	uint8_t version;
@@ -27,7 +29,7 @@ struct Packet {
 	ftl::codecs::definition_t definition;
 	uint8_t block_total;	// Packets expected per frame
 	uint8_t block_number; 	// This packets number within a frame
-	uint8_t flags;			// Codec dependent flags
+	uint8_t flags;			// Codec dependent flags (eg. I-Frame or P-Frame)
 	std::vector<uint8_t> data;
 
 	MSGPACK_DEFINE(codec, definition, block_total, block_number, flags, data);
@@ -41,9 +43,10 @@ struct Packet {
 struct StreamPacket {
 	int64_t timestamp;
 	uint8_t streamID;  		// Source number...
-	uint8_t channel;  // first bit = channel, second bit indicates second channel being sent
+	uint8_t channel_count;	// Number of channels to expect (usually 1 or 2)
+	uint8_t channel;		// Actual channel of this current set of packets
 
-	MSGPACK_DEFINE(timestamp, streamID, channel);
+	MSGPACK_DEFINE(timestamp, streamID, channel_count, channel);
 };
 
 }