track.cpp

#include "track.hpp"
#include "logger.hpp"

using namespace std;

extern Logger _log_;

void Track::SetPath(string & path)
{
	string s("path");
	SetTag(s, path);
}

/*	SetTag() parses a metadata tag produced by ffprobe. Metadata
	looks like:

	TAG:tagname=tagvalue\n.

	Did you know regex was invented by the second Chair of the
	UW - Madisonn CS department?

	After parsing the tag, the key-value pair is added to the
	track's tag map.

		// adding -show_entries format=duration -sexagesimal
		// will get the duration but it isn't in the same format.
		// instead it looks like this:
		// duration=0:04:19.213061
		// Luckily, the mysql TIME type will eat this directly.
*/
void Track::SetTag(string & raw)
{
	regex c("TAG:.*=.*\n");
	regex t(":.*=");
	regex v("=.*\n");

	if ((raw.size() > 12) && (raw.substr(0, 8) == "duration"))
	{
		string t = "duration";
		string v = raw.substr(9, string::npos);
		SetTag(t, v);
	}
	else if (regex_search(raw, c))
	{
		smatch mtag;
		smatch mval;
		string tag, value;

		regex_search(raw, mtag, t);
		regex_search(raw, mval, v);
		if (mtag.str(0).size() > 2)
			tag = string(mtag.str(0), 1, mtag.str(0).size() - 2);
		if (mval.str(0).size() > 2)
			value = string(mval.str(0), 1, mval.str(0).size() - 2);
		SetTag(tag, value);
	}
}

void Track::SetTag(string & tag, string & value)
{
	// All keys are squashed to lower case.
	transform(tag.begin(), tag.end(), tag.begin(), ::tolower);
	tags[tag] = value;
}

string Track::GetTag(string & tag)
{
	map<string, string>::iterator it;

	it = tags.find(tag);
	return (it != tags.end()) ? it->second : "";
}

/*	PrintTags() may be of some use during debugging.
*/
void Track::PrintTags(int width_1, int width_2)
{
	for (auto it = tags.begin(); it != tags.end(); it++)
	{
		cout << left << setw(width_1) << it->first << setw(width_2) << it->second << endl;
	}
}