PlaylistManager: Only search for folders, don't try it with webstreams.

/_mapping.txt, /player.json, /playlist_manager.json, /controller.json and /position.json to get the matching data as well as /cmd to send commands to.

README.md

@@ -37,7 +37,9 @@ and dashes an alike are okay. Put the SD card into the SD card slot.
 Copy `include/config.sample.h` to `include/config.h`. Modify it to at
 least contain the correct login details for your WiFi.
 
-The code then should compile in PlatformIO without errors.
+The code then should compile in PlatformIO without errors. Upload it
+to your ESP32. After that, upload static files using PlatformIO's task
+"Upload file system image".
 
 The serial console in PlatformIO should give you more or less useful
 messages about what's going on. There will also be a line saying
@@ -142,4 +144,4 @@ will only play in December. On December 1st, only track 1
 will play. On December 2nd, track 2 followed by track 1. On
 December 3rd, tracks 3, 1 and 2. From December 24th on, track
 24 followed by tracks 1-23. So your kid will get the "daily track"
-first, followed by all previous tags in the right order.
+first, followed by all previous tags in the right order.

data/index.html

@@ -93,6 +93,20 @@
 						<span>&times;</span>
 					</button>
 				</div>
+
+				<h6>Open URL</h6>
+				<div class="input-group">
+					<div class="input-group-prepend">
+						<span class="input-group-text">
+							<i class="fa fa-link"></i>
+						</span>
+					</div>
+					<input type="text" class="form-control" id="input_url" />
+					<div class="input-group-append">
+						<button class="btn btn-primary" id="button_url_open">Go</button>
+						<button class="btn btn-danger" id="button_url_add_mapping" style="display: none;"><i class="fa fa-arrows-alt-h"></i></button>
+					</div>
+				</div>
 				
 				<div class="modal-body">
 					<div id="albums_without_id_area">
@@ -173,7 +187,7 @@ update_playlist = function(data) {
 		tr = $('<tr>').data('track', i);
 		tr.append($('<td>').html(i + 1));
 		tr.append($('<td>').html(data.current_track==i ? '<i class="fa fa-play"></i>' : ''));
-		tr.append($('<td>').html(data.files[i].substr(data.files[i].lastIndexOf('/')+1)));
+		tr.append($('<td>').html(data.files[i].substr(data.files[i].title)));
 		$('#track_list').append(tr);
 	}
 	
@@ -189,12 +203,10 @@ update_playlist = function(data) {
 		$('#button_track_prev').removeClass('btn-primary').addClass('btn-secondary', 'btn-disabled');
 	}
 	
+	$('#album').html(data.title);
 	var file = data.files[data.current_track];
 	if (file) {
-		file = file.substr(1);
-		$('#album').html(file.substr(0, file.indexOf('/')));
-		file = file.substr(file.indexOf('/')+1);
-		$('#track').html(file.substr(0, file.lastIndexOf('.'))); 
+		$('#track').html(file.title); 
 	}
 }
 
@@ -249,6 +261,7 @@ process_ws_message = function(event) {
 	for (var i=0; i<data.length; i++) {
 		var json = JSON.parse(data[i]);
 		console.log(json);
+		if (json === null) continue;
 		switch(json["_type"]) {
 			case "position": update_position(json); break;
 			case "player": update_player(json); break;
@@ -275,13 +288,35 @@ $(function() {
 	$('#button_settings').click(function(e) { $('#settingsModal').modal('show'); });
 	$('#button_reset_vs1053').click(function(e) { ws.send("reset_vs1053"); $('#settingsModal').modal('hide'); });
 	$('#button_reboot').click(function(e) { ws.send("reboot"); $('#settingsModal').modal('hide'); });
+	$('#button_url_open').click(function(e) { ws.send("play " + $('#input_url').val()); $('#openModal').modal('hide');});
 	$('#button_add_mapping').click(function(e) {
 		$('#settingsModal').modal('hide');
 		$('#openModal').modal('show');
 		$('.add_mapping_button').show();
+		$('#button_url_open').hide();
+		$('#button_url_add_mapping').show();
 		play_on_click = false;
 	});
-	$('#openModal').on('click', '.add_mapping_button', function(e) {ws.send("add_mapping=" + $('#last_rfid_id').html() + "=" + $(e.target).parents('tr').data('folder')); $('#openModal').modal('hide'); $('.add_mapping_button').hide(); e.stopPropagation(); play_on_click=true; return false;});
+	$('#openModal').on('click', '.add_mapping_button', function(e) {
+		ws.send("add_mapping=" + $('#last_rfid_id').html() + "=" + $(e.target).parents('tr').data('folder'));
+		$('#openModal').modal('hide');
+		$('.add_mapping_button').hide();
+		$('#button_url_open').hide();
+		$('#button_url_add_mapping').show();
+		e.stopPropagation();
+		play_on_click=true;
+		return false;
+	});
+	$('#button_url_add_mapping').click(function(e) {
+		ws.send("add_mapping=" + $('#last_rfid_id').html() + "=" + $('#input_url').val());
+		$('#openModal').modal('hide');
+		$('.add_mapping_button').hide();
+		$('#button_url_open').hide();
+		$('#button_url_add_mapping').show();
+		e.stopPropagation();
+		play_on_click=true;
+		return false;
+	});
 });
 </script>
 </html>

include/controller.h

@@ -18,7 +18,6 @@ class Controller {
 private:
 	MFRC522* _rfid;
 	HTTPServer* _http_server;
-	PlaylistManager* _pm;
 	ControllerState _state = NORMAL;
 	bool _rfid_enabled = true;
 	void _check_rfid();
@@ -30,7 +29,7 @@ private:
 	bool _rfid_present = false;
 	String _last_rfid_uid = "";
 	String _last_rfid_data = "";
-	Player* _player;
+	
 	unsigned long _last_rfid_scan_at = 0;
 	unsigned long _last_position_info_at = 0;
 	String _serial_buffer = String();
@@ -42,6 +41,8 @@ private:
 	bool _check_button(uint8_t btn);
 public:
 	Controller(Player* p, PlaylistManager* pm);
+	PlaylistManager* pm;
+	Player* player;
 	void register_http_server(HTTPServer* h);
 	void loop();
 	void send_controller_status();

include/data_sources.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <Arduino.h>
+#include <SD.h>
+#include "config.h"
+#include "http_client_wrapper.h"
+
+class DataSource {
+private:
+public:
+	DataSource() {};
+	virtual ~DataSource() {};
+	virtual size_t read(uint8_t* buf, size_t len) = 0;
+	virtual int read() = 0;
+	virtual size_t position() = 0;
+	virtual void seek(size_t position) = 0;
+	virtual size_t size() = 0;
+	virtual void close() = 0;
+	virtual void skip_id3_tag() {};
+	virtual bool usable() = 0;
+};
+
+class SDDataSource : public DataSource {
+private:
+	File _file;
+public:
+	SDDataSource(String file);
+	~SDDataSource();
+	size_t read(uint8_t* buf, size_t len);
+	int read();
+	size_t position();
+	void seek(size_t position);
+	size_t size();
+	void close();
+	void skip_id3_tag();
+	bool usable();
+};
+
+class HTTPSDataSource : public DataSource {
+private:
+	WiFiClient* _stream = NULL;
+	HTTPClientWrapper* _http = NULL;
+	uint32_t _position;
+public:
+	HTTPSDataSource(String url, uint32_t offset=0);
+	~HTTPSDataSource();
+	size_t read(uint8_t* buf, size_t len);
+	int read();
+	size_t position();
+	void seek(size_t position);
+	size_t size();
+	void close();
+	bool usable();
+};

include/http_client_wrapper.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <HTTPClient.h>
+#include "config.h"
+
+class HTTPClientWrapper {
+private:
+	HTTPClient* _http;
+	uint8_t* _buffer;
+	uint16_t _buffer_size;
+	uint16_t _buffer_length;
+	uint16_t _buffer_position;
+	uint32_t _chunk_length;
+	
+	bool _connected = false;
+	String _content_type;
+	uint32_t _length;
+	bool _request(String method, String url, uint32_t offset=0, uint8_t redirection_count=0);
+	WiFiClient* _stream;
+	bool _is_chunked;
+	void _read_next_chunk_header(bool first);
+	uint16_t _fill_buffer();
+	
+public:
+	HTTPClientWrapper();
+	~HTTPClientWrapper();
+	bool get(String url, uint32_t offset=0, uint8_t redirection_count=0);
+	bool head(String url, uint32_t offset=0, uint8_t redirection_count=0);
+	String getContentType();
+	String getString();
+	int read();
+	uint32_t read(uint8_t* dst, uint32_t len);
+	void close();
+	uint32_t getSize();
+	String readUntil(String sep);
+	String readLine();
+};

include/player.h

@@ -4,6 +4,7 @@
 #include <SD.h>
 #include "spi_master.h"
 #include "playlist.h"
+#include "data_sources.h"
 
 class Player;
 
@@ -55,7 +56,6 @@ private:
 	void _flush_and_cancel();
 	int8_t _get_endbyte();
 	void _flush(uint count, int8_t fill_byte);
-	uint32_t _id3_tag_offset(File f);
 	void _play_file(String filename, uint32_t offset);
 	void _finish_playing();
 	void _finish_stopping(bool turn_speaker_off);
@@ -72,7 +72,7 @@ private:
 	SPISettings _spi_settings_fast = SPISettings(4000000, MSBFIRST, SPI_MODE0);
 	SPISettings* _spi_settings = &_spi_settings_slow;
 
-	File _file;
+	DataSource* _file;
 	uint32_t _file_size = 0;
 	uint8_t _buffer[32];
 	uint32_t _current_play_position = 0;

include/playlist.h

@@ -2,6 +2,14 @@
 #include <Arduino.h>
 #include <vector>
 #include <ArduinoJson.h>
+#include "http_client_wrapper.h"
+
+struct PlaylistEntry {
+	String filename;
+	String title;
+	
+	bool operator<(PlaylistEntry p) { return title < p.title; }
+};
 
 class Playlist {
 private:
@@ -9,10 +17,17 @@ private:
 	uint32_t _current_track = 0;
 	bool _started = false;
 	bool _shuffled = false;
-	std::vector<String> _files;
+	std::vector<PlaylistEntry> _files;
+	String _title = "";
+	void _add_path(String path);
+	void _examine_http_url(String url);
+	void _parse_rss(HTTPClientWrapper* http);
+	void _parse_m3u(HTTPClientWrapper* http);
+	void _parse_pls(HTTPClientWrapper* http);
 public:
 	Playlist(String path);
 	void start();
+	uint16_t get_file_count();
 	bool has_track_next();
 	bool has_track_prev();
 	bool track_next();

include/playlist_manager.h

@@ -19,4 +19,5 @@ public:
 	void scan_files();
 	String json();
 	bool add_mapping(String id, String folder);
+	String create_mapping_txt();
 };

platformio.ini

@@ -17,6 +17,7 @@ build_flags=!./build_version.sh
 lib_deps = MFRC522
 	https://github.com/me-no-dev/ESPAsyncWebServer.git
 	ArduinoJSON
+	6691 ; TinyXML
 upload_port = /dev/cu.SLAB_USBtoUART
 monitor_speed = 74480
-;monitor_port = /dev/cu.wchusbserial1420
+;monitor_port = /dev/cu.wchusbserial1420

src/controller.cpp

@@ -5,12 +5,12 @@
 #include "http_server.h"
 #include <ArduinoJson.h>
 
-Controller::Controller(Player* p, PlaylistManager* pm) {
-	_player = p;
-	_pm = pm;
+Controller::Controller(Player* p, PlaylistManager* playlist_manager) {
+	player = p;
+	pm = playlist_manager;
 	_rfid = new MFRC522(17, MFRC522::UNUSED_PIN);
 	
-	_player->register_controller(this);
+	player->register_controller(this);
 
 	BTN_NEXT_SETUP();
 	BTN_PREV_SETUP();
@@ -87,7 +87,7 @@ void Controller::_check_rfid() {
 		_rfid_present = false;
 		INFO("No more RFID card.\n");
 		if (_state != LOCKED) {
-			_player->stop();
+			player->stop();
 		}
 		send_controller_status();
 	} else {
@@ -106,7 +106,7 @@ void Controller::_check_rfid() {
 			String data = _read_rfid_data();
 			_last_rfid_data = data;
 
-			Playlist* pl = _pm->get_playlist_for_id(s_uid);
+			Playlist* pl = pm->get_playlist_for_id(s_uid);
 			if (data.indexOf("[lock]") != -1) {
 				if (_state == LOCKED) {
 					_state = NORMAL;
@@ -152,7 +152,7 @@ void Controller::_check_rfid() {
 				DEBUG("ControllerState is now LOCKED.\n");
 			}
 			
-			_player->play(pl);
+			player->play(pl);
 			//send_playlist_manager_status();
 			send_controller_status();
 		}
@@ -248,38 +248,38 @@ bool Controller::process_message(String cmd) {
 	DEBUG("Executing command: %s\n", cmd.c_str());
 
 	if (cmd.startsWith("play ")) {
-		Playlist* p = _pm->get_playlist_for_folder(cmd.substring(5));
-		_player->play(p);
+		Playlist* p = pm->get_playlist_for_folder(cmd.substring(5));
+		player->play(p);
 	//} else if (cmd.equals("ls")) {
 	//	_execute_command_ls("/");
 	//} else if (cmd.startsWith("ls ")) {
 	//	_execute_command_ls(cmd.substring(3));
 	} else if (cmd.equals("play")) {
-		_player->play();
+		player->play();
 	
 	} else if (cmd.equals("stop")) {
-		_player->stop();
+		player->stop();
 	} else if (cmd.equals("help")) {
 		_execute_command_help();
 	} else if (cmd.equals("-")) {
-		_player->vol_down();
+		player->vol_down();
 	} else if (cmd.equals("+")) {
-		_player->vol_up();
+		player->vol_up();
 	} else if (cmd.startsWith("volume=")) {
 		uint8_t vol = cmd.substring(7).toInt();
-		_player->set_volume(vol);
+		player->set_volume(vol);
 	} else if (cmd.equals("track_prev")) {
-		_player->track_prev();
+		player->track_prev();
 	} else if (cmd.equals("track_next")) {
-		_player->track_next();
+		player->track_next();
 	} else if (cmd.startsWith("track=")) {
 		uint8_t track = cmd.substring(6).toInt();
-		_player->set_track(track);
+		player->set_track(track);
 	} else if (cmd.equals("ids")) {
-		_pm->dump_ids();
+		pm->dump_ids();
 	} else if (cmd.equals("reset_vs1053")) {
-		_player->stop();
-		_player->init();
+		player->stop();
+		player->init();
 	} else if (cmd.equals("reboot")) {
 		ESP.restart();
 	} else if (cmd.startsWith("add_mapping=")) {
@@ -287,7 +287,7 @@ bool Controller::process_message(String cmd) {
 		uint8_t idx = rest.indexOf('=');
 		String id = rest.substring(0, idx);
 		String folder = rest.substring(idx + 1);
-		_pm->add_mapping(id, folder);
+		pm->add_mapping(id, folder);
 		send_playlist_manager_status();
 	} else {
 		ERROR("Unknown command: %s\n", cmd.c_str());
@@ -299,7 +299,7 @@ bool Controller::process_message(String cmd) {
 void Controller::_execute_command_ls(String path) {
 	INFO("Listing contents of %s:\n", path.c_str());
 	// TODO
-	//std::list<String> files = _player->ls(path);
+	//std::list<String> files = player->ls(path);
 	//for(std::list<String>::iterator it=files.begin(); it!=files.end(); ++it) {
 	//	INFO("  %s\n", (*it).c_str());
 	//}
@@ -321,17 +321,17 @@ void Controller::_check_buttons() {
 
 	if (BTN_PREV() && _debounce_button(0)) {
 		if (_state == NORMAL) {
-			_player->track_prev();
+			player->track_prev();
 		} else {
 			DEBUG("Ignoring btn_prev because state is LOCKED.\n");
 		}
 	} else if (BTN_VOL_UP() && _debounce_button(1)) {
-		_player->vol_up();
+		player->vol_up();
 	} else if (BTN_VOL_DOWN() && _debounce_button(2)) {
-		_player->vol_down();
+		player->vol_down();
 	} else if (BTN_NEXT() && _debounce_button(3)) {
 		if (_state == NORMAL) {
-			_player->track_next();
+			player->track_next();
 		} else {
 			DEBUG("Ignoring btn_next because state is LOCKED.\n");
 		}
@@ -360,6 +360,8 @@ String Controller::json() {
 	JsonObject rfid = json.createNestedObject("last_rfid");
 	rfid["uid"] = _last_rfid_uid;
 	rfid["data"] = _last_rfid_data;
+	json["uptime"] = millis() / 1000;
+	json["free_heap"] = ESP.getFreeHeap();
 	return json.as<String>();
 }
 
@@ -367,22 +369,22 @@ void Controller::send_player_status() {
 	TRACE("In send_player_status()...\n");
 
 	if (_http_server->ws->count() > 0) {
-		_http_server->ws->textAll(_player->json());
-		_http_server->ws->textAll(_player->position_json());
+		_http_server->ws->textAll(player->json());
+		_http_server->ws->textAll(player->position_json());
 	}
 }
 
 void Controller::send_playlist_manager_status() {
 	TRACE("In send_playlist_manager_status()...\n");
 	if (_http_server->ws->count() > 0) {
-		_http_server->ws->textAll(_pm->json());
+		_http_server->ws->textAll(pm->json());
 	}
 }
 
 void Controller::send_position() {
 	TRACE("In send_position()...\n");
-	if (_http_server->ws->count() > 0 && _player->is_playing()) {
-		_http_server->ws->textAll(_player->position_json());
+	if (_http_server->ws->count() > 0) {
+		_http_server->ws->textAll(player->position_json());
 	}
 	_last_position_info_at = millis();
 }
@@ -396,11 +398,11 @@ void Controller::send_controller_status() {
 
 void Controller::inform_new_client(AsyncWebSocketClient* client) {
 	String s;
-	s += _pm->json();
+	s += pm->json();
 	s += '\n';
-	s += _player->json();
+	s += player->json();
 	s += '\n';
-	s += _player->position_json();
+	s += player->position_json();
 	s += '\n';
 	s += json();
 	client->text(s);
@@ -412,6 +414,6 @@ void Controller::queue_command(String s) {
 }
 
 void Controller::update_playlist_manager() {
-	_pm->scan_files();
+	pm->scan_files();
 	send_playlist_manager_status();
-}
+}

src/data_sources.cpp

@@ -0,0 +1,57 @@
+#include "data_sources.h"
+
+////////////// SDDataSource //////////////
+SDDataSource::SDDataSource(String file) { _file = SD.open(file, "r"); }
+SDDataSource::~SDDataSource() { if (_file) _file.close(); }
+size_t SDDataSource::read(uint8_t* buf, size_t len) { return _file.read(buf, len); }
+int SDDataSource::read() { return _file.read(); }
+size_t SDDataSource::position() { return _file.position(); }
+void SDDataSource::seek(size_t position) { _file.seek(position); }
+size_t SDDataSource::size() { return _file.size(); }
+void SDDataSource::close() { _file.close(); }
+bool SDDataSource::usable() { return _file; }
+
+void SDDataSource::skip_id3_tag() {
+	uint32_t original_position = _file.position();
+	uint32_t offset = 0;
+	if (_file.read()=='I' && _file.read()=='D' && _file.read()=='3') {
+		DEBUG("ID3 tag found\n");
+		// Skip ID3 tag version
+		_file.read(); _file.read();
+		byte tags = _file.read();
+		bool footer_present = tags & 0x10;
+		DEBUG("ID3 footer found: %d\n", footer_present);
+		for (byte i=0; i<4; i++) {
+			offset <<= 7;
+			offset |= (0x7F & _file.read());
+		}
+		offset += 10;
+		if (footer_present) offset += 10;
+		DEBUG("ID3 tag length is %d bytes.\n", offset);
+		_file.seek(offset);
+	} else {
+		DEBUG("No ID3 tag found\n");
+		_file.seek(original_position);
+	}
+}
+
+
+
+////////////// HTTPSDataSource //////////////
+HTTPSDataSource::HTTPSDataSource(String url, uint32_t offset) {
+	_http = new HTTPClientWrapper();
+	if (!_http->get(url, offset)) return;
+	_position = 0;
+}
+
+HTTPSDataSource::~HTTPSDataSource() {
+	_http->close();
+	delete _http;
+}
+bool HTTPSDataSource::usable() { return _http; }
+size_t HTTPSDataSource::read(uint8_t* buf, size_t len) { size_t result = _http->read(buf, len); _position += result; return result; }
+int HTTPSDataSource::read() { int b = _http->read(); if (b>=0) _position++; return b; }
+size_t HTTPSDataSource::position() { return _position; }
+void HTTPSDataSource::seek(size_t position) { return; /* TODO */ }
+size_t HTTPSDataSource::size() { return _http->getSize(); }
+void HTTPSDataSource::close() { _http->close(); }

src/http_client_wrapper.cpp

@@ -0,0 +1,210 @@
+#include "http_client_wrapper.h"
+#include <WiFiClientSecure.h>
+
+HTTPClientWrapper::HTTPClientWrapper() {
+	_buffer = new uint8_t[512];
+	_buffer_size = 512;
+}
+
+HTTPClientWrapper::~HTTPClientWrapper() {
+	if (_http) {
+		_http->end();
+		delete _http;
+	}
+	delete _buffer;
+}
+
+void HTTPClientWrapper::close() {
+	_http->end();
+	_connected = false;
+}
+
+bool HTTPClientWrapper::get(String url, uint32_t offset, uint8_t redirection_count) { return _request("GET", url, offset, redirection_count); }
+bool HTTPClientWrapper::head(String url, uint32_t offset, uint8_t redirection_count) { return _request("HEAD", url, offset, redirection_count); }
+
+bool HTTPClientWrapper::_request(String method, String url, uint32_t offset, uint8_t redirection_count) {
+	if (redirection_count>=5) return false;
+	
+	//if (_http) delete _http;
+	
+	DEBUG("%s %s\n", method.c_str(), url.c_str());
+	_http = new HTTPClient();
+	
+	
+	_http->setUserAgent("PodBox/0.1");
+	if (offset) {
+		String s = "bytes=";
+		s += offset;
+		s += "-";
+		_http->addHeader("Range: ", s);
+	}
+	
+	const char* headers[] = {"Location", "Content-Type", "Transfer-Encoding"};
+	_http->collectHeaders(headers, 3);
+	bool result;
+	/*if (url.startsWith("https:")) {
+		BearSSL::WiFiClientSecure* client = new BearSSL::WiFiClientSecure();
+		client->setInsecure();
+		result = _http->begin(*client, url);
+	} else {
+		result = _http->begin(url);
+	}*/
+	result = _http->begin(url);
+	TRACE("HTTP->begin result: %d\n", result);
+	if (!result) return false;
+	
+	int status = _http->sendRequest(method.c_str());
+	TRACE("HTTP Status code: %d\n", status);
+	if (status == HTTP_CODE_FOUND || status==HTTP_CODE_MOVED_PERMANENTLY || status==HTTP_CODE_TEMPORARY_REDIRECT) {
+		if (_http->hasHeader("Location")) {
+			url = _http->header("Location");
+			_http->end();
+			delete _http;
+			_http = NULL;
+			return _request(method, url, offset, redirection_count+1);
+		} else {
+			ERROR("Got redirection HTTP code, but no Location header.\n");
+			delete _http;
+			_http = NULL;
+			return false;
+		}
+	} else if (status != HTTP_CODE_OK) {
+		DEBUG("Unexpected HTTP return code %d. Cancelling.\n", status);
+		return false;
+	}
+	
+	_connected = true;
+	_length = _http->getSize() + offset;
+	if (_http->hasHeader("Content-Type")) {
+		_content_type = _http->header("Content-Type");
+	} else {
+		_content_type = "";
+	}
+	_is_chunked = (_http->hasHeader("Transfer-Encoding")) && (_http->header("Transfer-Encoding").indexOf("chunked")!=-1);
+	_stream = _http->getStreamPtr();
+	if (_is_chunked) {
+		_read_next_chunk_header(true);
+	}
+	return true;
+}
+
+void HTTPClientWrapper::_read_next_chunk_header(bool first) {
+	if (!_connected) {
+		_chunk_length = 0;
+		return;
+	}
+	
+	if (!first) {
+		// read() returns an error if no bytes is available right at this moment.
+		// So we wait until 2 bytes are available or the connection times out.
+		while (_stream->connected() && !_stream->available()) { delay(1); }
+		int c1 = _stream->read();
+		while (_stream->connected() && !_stream->available()) { delay(1); }
+		int c2 = _stream->read();
+		if (c1==-1 || c2==-1) {
+			ERROR("Connection timeout.\n");
+			DEBUG("_stream.connected() returns %d\n", _stream->connected());
+			_chunk_length = 0;
+			_connected = false;
+			return;
+		} else if (c1!='\r' || c2!='\n') {
+			ERROR("Invalid chunk border found. Found: 0x%02X 0x%02X\n", c1, c2);
+			_chunk_length = 0;
+			_connected = false;
+			return;
+		}
+	}
+	String chunk_header = _stream->readStringUntil('\n');
+	chunk_header.trim();
+	_chunk_length = strtol(chunk_header.c_str(), NULL, 16);
+	if (_chunk_length == 0) {
+		_connected = false;
+		TRACE("Empty chunk found -> EOF reached.\n");
+	} else {
+		TRACE("Chunk found. Length: %d\n", _chunk_length);
+	}
+}
+
+uint16_t HTTPClientWrapper::_fill_buffer() {
+	if (!_connected) {
+		_buffer_position = 0;
+		_buffer_length = 0;
+		return 0;
+	}
+	
+	uint16_t bytes_to_fill = _buffer_size;
+	uint16_t bytes_filled = 0;
+	while (bytes_to_fill > 0) {
+		uint16_t bytes_to_request = bytes_to_fill;
+		if (_is_chunked && _chunk_length < bytes_to_fill) bytes_to_request = _chunk_length;
+		TRACE("fill_buffer loop. _is_chunked: %d, _chunk_length: %d, _buffer_size: %d, bytes_filled: %d, bytes_to_fill: %d, bytes_to_request: %d", _is_chunked, _chunk_length, _buffer_size, bytes_filled, bytes_to_fill, bytes_to_request);
+		uint16_t result = _stream->readBytes(_buffer + bytes_filled, bytes_to_request);
+		TRACE(", result: %d\n", result);
+		bytes_filled += result;
+		bytes_to_fill -= result;
+		if (_is_chunked) {
+			_chunk_length -= result;
+			if (_chunk_length == 0) _read_next_chunk_header(false);
+		}
+		if (result == 0) {
+			_connected = false;
+			break;
+		}
+	}
+	_buffer_position = 0;
+	_buffer_length = bytes_filled;
+	TRACE("Buffer filled. _buffer_length: %d\n", _buffer_length);
+	return bytes_filled;
+}
+
+String HTTPClientWrapper::getContentType() {
+	return _content_type;
+}
+
+int HTTPClientWrapper::read() {
+	if (_buffer_position >= _buffer_length) _fill_buffer();
+	if (_buffer_position >= _buffer_length) return -1;
+	return _buffer[_buffer_position++];
+}
+
+uint32_t HTTPClientWrapper::read(uint8_t* dst, uint32_t len) {
+	TRACE("Reading %d bytes...\n", len);
+	uint32_t bytes_filled = 0;
+	while (1) {
+		if (_buffer_position >= _buffer_length) _fill_buffer();
+		if (_buffer_position >= _buffer_length) break;
+
+		uint32_t bytes_to_fill = len;
+		if (bytes_to_fill > _buffer_length - _buffer_position) bytes_to_fill = _buffer_length - _buffer_position;
+
+		TRACE("read_loop: _buffer_length=%d, _buffer_position=%d, len=%d, bytes_to_fill=%d\n", _buffer_length, _buffer_position, len, bytes_to_fill);
+		memcpy(dst + bytes_filled, _buffer + _buffer_position, bytes_to_fill);
+		_buffer_position += bytes_to_fill;
+		bytes_filled += bytes_to_fill;
+		len -= bytes_to_fill;
+		if (bytes_to_fill==0 || len==0) break;
+	}
+	return bytes_filled;
+}
+
+uint32_t HTTPClientWrapper::getSize() {return _length; }
+
+String HTTPClientWrapper::readUntil(String sep) {
+	String result = "";
+	while(true) {
+		int i = read();
+		if (i==-1) break;
+		char c = i;
+		if (sep.indexOf(c)!=-1) {
+			// separator
+			if (result.length()>0) break;
+		} else {
+			result.concat(c);
+		}
+	}
+	return result;
+}
+
+String HTTPClientWrapper::readLine() {
+	return readUntil("\n\r");
+}

src/http_server.cpp

@@ -10,8 +10,15 @@ HTTPServer::HTTPServer(Player* p, Controller* c) {
 	ws = new AsyncWebSocket("/ws");
 	_server->addHandler(ws);
 	ws->onEvent([&](AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len){this->_onEvent(server, client, type, arg, data, len);});
-	_server->on("/", [&](AsyncWebServerRequest* req) {req->send(SPIFFS, "/index.html", "text/html");});
+	
+	_server->on("/", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(SPIFFS, "/index.html", "text/html");});
 	_server->on("/upload", HTTP_POST, [](AsyncWebServerRequest* req) {req->send(200); }, ([&](AsyncWebServerRequest *request, String filename, size_t index, uint8_t *data, size_t len, bool final){this->_handle_upload(request, filename, index, data, len, final);}));
+	_server->on("/_mapping.txt", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "text/plain", _controller->pm->create_mapping_txt());});
+	_server->on("/player.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->player->json());});
+	_server->on("/playlist_manager.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->pm->json());});
+	_server->on("/controller.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->json());});
+	_server->on("/position.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->player->position_json());});
+	_server->on("/cmd", HTTP_POST, [&](AsyncWebServerRequest *req) {req->send(200); }, NULL, [&](AsyncWebServerRequest *request, uint8_t *data, size_t len, size_t index, size_t total) {_controller->queue_command((char*)data);});
 	_server->begin();
 	MDNS.addService("http", "tcp", 80);
 }
@@ -129,8 +136,9 @@ void HTTPServer::_onEvent(AsyncWebSocket * server, AsyncWebSocketClient * client
 	} else if (type==WS_EVT_DATA) {
 		AwsFrameInfo* info = (AwsFrameInfo*) arg;
 		if (info->final && info->index==0 && info->len==len && info->opcode==WS_TEXT) {
+			data[len]='\0';
 			DEBUG("Received ws message: %s\n", (char*)data);
 			_controller->queue_command((char*)data);
 		}
 	}
-}
+}

src/main.cpp

@@ -18,6 +18,19 @@ HTTPServer* http_server;
 
 uint8_t SPIMaster::state = 0;
 
+bool connect_to_wifi(String ssid, String pass) {
+	TRACE("Connecting to wifi \"%s\"...\n", ssid.c_str());
+	WiFi.mode(WIFI_AP_STA);
+	WiFi.begin(ssid.c_str(), pass.c_str());
+	if (WiFi.waitForConnectResult() != WL_CONNECTED) {
+		DEBUG("Could not connect to wifi \"%s\".\n", ssid.c_str());
+		return false;
+	} else {
+		INFO("Connected to \"%s\". IP address: %s\n", ssid.c_str(), WiFi.localIP().toString().c_str());
+	}
+	return true;
+}
+
 void setup() {
 	delay(500);
 	Serial.begin(74880);
@@ -58,15 +71,35 @@ void setup() {
     controller = new Controller(player, pm);
     INFO("Player and controller initialized.\n");
 
-	DEBUG("Connecting to wifi \"%s\"...\n", WIFI_SSID);
-	WiFi.mode(WIFI_AP_STA);
-	WiFi.begin(WIFI_SSID, WIFI_PASS);
-	if (WiFi.waitForConnectResult() != WL_CONNECTED) {
-		ERROR("Could not connect to Wifi. Rebooting.");
-		delay(1000);
-		ESP.restart();
+	bool connected = false;
+	INFO("Connecting to WiFi...\n");
+	SPIMaster::select_sd();
+	if (SD.exists("/_wifis.txt")) {
+		DEBUG("Reading /_wifis.txt\n");
+		File f = SD.open("/_wifis.txt", "r");
+		while (String line = f.readStringUntil('\n')) {
+			if (line.length()==0 || line.startsWith("#") || line.indexOf('=')==-1) {
+				continue;
+			}
+			String ssid = line.substring(0, line.indexOf('='));
+			String pass = line.substring(line.indexOf('=')+1);
+			connected = connect_to_wifi(ssid, pass);
+			if (connected) break;
+		}
+		f.close();
+	} else {
+		File f = SD.open("/_wifis.txt", "w");
+		f.print("# WiFi definitions. Syntax: <SSID>=<PASS>. Lines starting with # are ignored. Example:\n# My WiFi=VerySecretPassword\n");
+		f.close();
+	}
+	SPIMaster::select_sd(false);
+	if (!connected) {
+		DEBUG("Trying hardcoded WiFi data...\n");
+		connected = connect_to_wifi(WIFI_SSID, WIFI_PASS);
+	}
+	if (!connected) {
+		INFO("No WiFi connection!\n");
 	}
-	INFO("WiFi connected. IP address: %s\n", WiFi.localIP().toString().c_str());
 	
 	MDNS.begin("esmp3");
 

src/player.cpp

@@ -463,12 +463,14 @@ void Player::set_volume(uint8_t vol, bool save) {
 }
 
 void Player::vol_up() {
+	if (!is_playing()) return;
 	uint8_t vol = _volume + VOLUME_STEP;
 	if (vol > VOLUME_MAX) vol=VOLUME_MAX;
 	set_volume(vol);
 }
 
 void Player::vol_down() {
+	if (!is_playing()) return;
 	uint8_t vol = _volume - VOLUME_STEP;
 	if (vol < VOLUME_MIN) vol=VOLUME_MIN;
 	set_volume(vol);
@@ -531,6 +533,7 @@ bool Player::play() {
 	if (_state == sleeping || _state == recording) _wakeup();
 	if (_state != idle) return false;
 	if (_current_playlist == NULL) return false;
+	if (_current_playlist->get_file_count()==0) return false;
 	_current_playlist->start();
 	String file = _current_playlist->get_current_file();
 	uint32_t position = _current_playlist->get_position();
@@ -543,10 +546,16 @@ bool Player::play() {
 void Player::_play_file(String file, uint32_t file_offset) {
 	INFO("play_file('%s', %d)\n", file.c_str(), file_offset);
 	_spi->select_sd();
-	_file = SD.open(file);
-	_file_size = _file.size();
+	if (file.startsWith("/")) {
+		_file = new SDDataSource(file);
+	} else if (file.startsWith("http")) {
+		_file = new HTTPSDataSource(file);
+	} else {
+		return;
+	}
+	_file_size = _file->size();
 	_spi->select_sd(false);
-	if (!_file) {
+	if (!_file || !_file->usable()) {
 		DEBUG("Could not open file %s", file.c_str());
 		return;
 	}
@@ -559,10 +568,10 @@ void Player::_play_file(String file, uint32_t file_offset) {
 
 	_spi->select_sd();
 	if (file_offset == 0) {
-		_file.seek(_id3_tag_offset(_file));
+		_file->skip_id3_tag();
 	}
 	_refills = 0;
-	_current_play_position = _file.position();
+	_current_play_position = _file->position();
 	_spi->select_sd(false);
 	_skip_to = file_offset;
 	if (_skip_to>0) _mute();
@@ -571,30 +580,6 @@ void Player::_play_file(String file, uint32_t file_offset) {
 	_controller->send_player_status();
 }
 
-uint32_t Player::_id3_tag_offset(File f) {
-	uint32_t original_position = f.position();
-	uint32_t offset = 0;
-	if (f.read()=='I' && f.read()=='D' && f.read()=='3') {
-		DEBUG("ID3 tag found\n");
-		// Skip ID3 tag version
-		f.read(); f.read();
-		byte tags = f.read();
-		bool footer_present = tags & 0x10;
-		DEBUG("ID3 footer found: %d\n", footer_present);
-		for (byte i=0; i<4; i++) {
-			offset <<= 7;
-			offset |= (0x7F & f.read());
-		}
-		offset += 10;
-		if (footer_present) offset += 10;
-		DEBUG("ID3 tag length is %d bytes.\n", offset);
-	} else {
-		DEBUG("No ID3 tag found\n");
-	}
-	f.seek(original_position);
-	return offset;
-}
-
 void Player::_flush(uint count, int8_t byte) {
 	_spi->select_vs1053_xdcs();
 	SPI.beginTransaction(*_spi_settings);
@@ -650,7 +635,8 @@ void Player::_finish_stopping(bool turn_speaker_off) {
 	_state = idle;
 	_stopped_at = millis();
 	if (_file) {
-		_file.close();
+		_file->close();
+		delete _file;
 	}
 	_current_play_position = 0;
 	_file_size = 0;
@@ -662,7 +648,7 @@ void Player::_refill() {
 	_spi->select_sd();
 	_refills++;
 	if (_refills % 1000 == 0) DEBUG(".");
-	uint8_t result = _file.read(_buffer, sizeof(_buffer));
+	uint8_t result = _file->read(_buffer, sizeof(_buffer));
 	_spi->select_sd(false);
 	if (result == 0) {
 		// File is over.
@@ -684,13 +670,13 @@ void Player::_refill() {
 	_write_data(_buffer);
 
 	if (_skip_to > 0) {
-		if (_skip_to > _file.position()) {
+		if (_skip_to > _file->position()) {
 			uint16_t status = _read_control_register(SCI_STATUS);
 			if ((status & SS_DO_NOT_JUMP) == 0) {
 				DEBUG("Skipping to %d.\n", _skip_to);
 				_flush(2048, _get_endbyte());
 				_spi->select_sd();
-				_file.seek(_skip_to);
+				_file->seek(_skip_to);
 				_spi->select_sd(false);
 				_skip_to = 0;
 				_unmute();
@@ -755,6 +741,7 @@ String Player::json() {
 }
 
 String Player::position_json() {
+	if (!is_playing()) return "null";
 	DynamicJsonDocument json(200);
 	json["_type"] = "position";
 	json["position"] = _current_play_position;

src/playlist.cpp

@@ -4,9 +4,18 @@
 #include <SD.h>
 #include <algorithm>
 #include <ArduinoJson.h>
+#include <TinyXML.h>
 
 Playlist::Playlist(String path) {
-	// Add files to _files
+	if (path.startsWith("/")) {
+		_add_path(path);
+	} else if (path.startsWith("http")) {
+		_examine_http_url(path);
+	}
+	if (_title.length()==0) _title=path;
+}
+
+void Playlist::_add_path(String path) {
 	SPIMaster::select_sd();
 	TRACE("Examining folder %s...\n", path.c_str());
 	if (!path.startsWith("/")) path = String("/") + path;
@@ -15,6 +24,11 @@ Playlist::Playlist(String path) {
 		SPIMaster::select_sd(false);
 		return;
 	}
+	_title = path.substring(1);
+	int idx = _title.indexOf('/');
+	if (idx>0) {
+		_title.remove(idx);
+	}
 	File dir = SD.open(path);
 	File entry;
 	while (entry = dir.openNextFile()) {
@@ -29,7 +43,8 @@ Playlist::Playlist(String path) {
 			  ext.equals(".mp4") ||
 			  ext.equals(".mpa"))) {
 			TRACE("    Adding entry %s\n", entry.name());
-			_files.push_back(entry.name());
+			String title = filename.substring(0, filename.length() - 4);
+			_files.push_back({.filename=entry.name(), .title=title});
 			bool non_ascii_chars = false;
 			for(int i=0; i<filename.length(); i++) {
 				char c = filename.charAt(i);
@@ -51,6 +66,175 @@ Playlist::Playlist(String path) {
 	std::sort(_files.begin(), _files.end());
 }
 
+void Playlist::_examine_http_url(String url) {
+	HTTPClientWrapper* http = new HTTPClientWrapper();
+	if (!http->get(url)) {
+		DEBUG("Could not GET %s.\n", url.c_str());
+		return;
+	}
+	String ct = http->getContentType();
+	DEBUG("Content-Type is %s.\n", ct.c_str());
+	if (ct.startsWith("audio/x-mpegurl")) {
+		_parse_m3u(http);
+	} else if (ct.startsWith("audio/")) {
+		_files.push_back({.filename=url, .title=url});
+	} else if (ct.startsWith("application/rss+xml")) {
+		_parse_rss(http);
+	} else if (ct.startsWith("application/pls+xml")) {
+		_parse_pls(http);
+	} else {
+		ERROR("Unknown content type %s.\n", ct.c_str());
+	}
+	http->close();
+	delete http;
+}
+
+std::vector<PlaylistEntry>* xml_files_ptr = NULL;
+String xml_last_tag = "";
+String xml_title = "";
+String xml_album_title = "";
+String xml_url = "";
+String xml_enclosure_url = "";
+bool xml_enclosure_is_audio = false;
+
+void xmlcb(uint8_t status, char* tagName, uint16_t tagLen, char* data, uint16_t dataLen) {
+	String tag(tagName);
+	if (status & STATUS_START_TAG) xml_last_tag = tag;
+
+	if (tag.equals("/rss/channel/title") && (status & STATUS_TAG_TEXT)) {
+		xml_album_title = data;
+	} else if (tag.endsWith("/item") && (status & STATUS_START_TAG)) {
+		xml_title = "";
+		xml_url = "";
+	} else if (tag.endsWith("/item/title") && (status & STATUS_TAG_TEXT)) {
+		xml_title = String(data);
+	//} else if (xml_last_tag.endsWith("/item/enclosure") && (status & STATUS_ATTR_TEXT)) {
+	//	DEBUG("tag: %s, data: %s\n", tag.c_str(), data);
+	} else if (xml_last_tag.endsWith("/item/enclosure") && tag.equals("type") && (status & STATUS_ATTR_TEXT) && String(data).indexOf("audio/")>=0) {
+		DEBUG("enclosure is audio\n");
+		xml_enclosure_is_audio = true;
+	} else if (xml_last_tag.endsWith("/item/enclosure") && tag.equals("url") && (status & STATUS_ATTR_TEXT)) {
+		DEBUG("found url\n");
+		xml_enclosure_url = String(data);
+	} else if (tag.endsWith("/item/enclosure") && (status & STATUS_END_TAG)) {
+		DEBUG("end of enclosure. xml_enclosure_is_audio: %d, xml_enclosure_url: %s\n", xml_enclosure_is_audio, xml_enclosure_url.c_str());
+		if (xml_enclosure_is_audio && xml_enclosure_url.length()>0) {
+			xml_url = xml_enclosure_url;
+		}
+		xml_enclosure_is_audio = false;
+		xml_enclosure_url = "";
+	} else if (tag.endsWith("/item") && (status & STATUS_END_TAG)) {
+		if (xml_title.length()>0 && xml_url.length()>0) {
+			DEBUG("Adding playlist entry: '%s' => '%s'\n", xml_title.c_str(), xml_url.c_str());
+			xml_files_ptr->push_back({xml_url, xml_title});
+		}
+	}
+}
+
+void Playlist::_parse_rss(HTTPClientWrapper* http) {
+	DEBUG("RSS parser running.\n");
+	// http is already initialized
+	int i;
+	
+	TinyXML xml;
+	uint8_t* buffer = new uint8_t[150];
+	xml.init(buffer, 150, &xmlcb);
+	xml_files_ptr = &_files;
+	xml_title = "";
+	xml_album_title = "";
+	xml_url = "";
+	xml_enclosure_is_audio = false;
+	xml_enclosure_url = "";
+	while ((i = http->read()) >= 0) {
+		xml.processChar(i);
+	}
+	xml_files_ptr = NULL;
+	if (xml_album_title.length()>0) {
+		_title = xml_album_title;
+	}
+	xml_album_title = "";
+	delete buffer;		
+	// don't close http at the end
+	DEBUG("RSS parser finished.\n");
+}
+
+void Playlist::_parse_m3u(HTTPClientWrapper* http) {
+	// http is already initialized
+	String line = "";
+	String title = "";
+	int i;
+	do {
+		i = http->read();
+		char c = i;
+		if (i>=-1 && c!='\r' && c!='\n') {
+			line += c;
+		} else {
+			if (line.equals("#EXTM3U")) {
+				// Do nothing
+			} else if (line.startsWith("#EXTINF")) {
+				int idx = line.indexOf(",");
+				if (idx>4) {
+					// Get the title
+					title = line.substring(idx+1);
+					if (_title.length()==0) _title=title;
+				}
+			} else if (line.startsWith("http")) {
+				if (title.length()==0) title = line;
+				_files.push_back({.filename=line, .title=title});
+				title = "";
+			}
+			line = "";
+		}
+	} while (i>=0);
+	// don't close http at the end
+}
+
+void Playlist::_parse_pls(HTTPClientWrapper* http) {
+	// http is already initialized
+	String line;
+	String title = "";
+	String url = "";
+	int last_index = -1;
+	int index;
+
+	while(true) {
+		line = http->readLine();
+		if (line.startsWith("Title")) {
+			uint8_t eq_idx = line.indexOf('=');
+			if (eq_idx==-1) continue;
+
+			index = line.substring(5, eq_idx-4).toInt();
+			title = line.substring(eq_idx+1);
+			if (index != last_index) {
+				url = "";
+				last_index = index;
+			}
+		} else if (line.startsWith("File")) {
+			uint8_t eq_idx = line.indexOf('=');
+			if (eq_idx==-1) continue;
+
+			index = line.substring(5, eq_idx-4).toInt();
+			url = line.substring(eq_idx+1);
+			if (index != last_index) {
+				title = "";
+				last_index = index;
+			}
+		}
+
+		if (title.length()>0 && url.length()>0) {
+			_files.push_back({.filename=url, .title=title});
+			last_index = -1;
+			title = "";
+			url = "";
+		}
+	}
+	// don't close http at the end
+}
+
+uint16_t Playlist::get_file_count() {
+	return _files.size();
+}
+
 void Playlist::start() {
 	_started = true;
 }
@@ -100,7 +284,7 @@ void Playlist::shuffle(uint8_t random_offset) {
 		int j = random(random_offset, _files.size()-1);
 		if (i!=j) {
 			TRACE("  Swapping elements %d and %d.\n", i, j);
-			String temp = _files[i];
+			PlaylistEntry temp = _files[i];
 			_files[i] = _files[j];
 			_files[j] = temp;
 		}
@@ -127,7 +311,7 @@ void Playlist::reset() {
 }
 
 String Playlist::get_current_file() {
-	return _files[_current_track];
+	return _files[_current_track].filename;
 }
 
 uint32_t Playlist::get_position() {
@@ -144,15 +328,18 @@ bool Playlist::is_fresh() {
 
 void Playlist::dump() {
 	for (int i=0; i<_files.size(); i++) {
-		DEBUG("  %02d %2s %s\n", i+1, (i==_current_track) ? "->" : "", _files[i].c_str());
+		DEBUG("  %02d %2s %s\n", i+1, (i==_current_track) ? "->" : "", _files[i].filename.c_str());
 	}
 }
 
 void Playlist::json(JsonObject json) {
 	json["_type"] = "playlist";
+	json["title"] = _title;
 	JsonArray files = json.createNestedArray("files");
-	for (String file: _files) {
-		files.add(file);
+	for (PlaylistEntry entry: _files) {
+		JsonObject o = files.createNestedObject();
+		o["filename"] = entry.filename;
+		o["title"] = entry.title;
 	}
 	json["current_track"] = _current_track;
 	json["has_track_next"] = has_track_next();

src/playlist_manager.cpp

@@ -39,16 +39,18 @@ void PlaylistManager::scan_files() {
 				String folder = data.substring(eq + 1);
 				TRACE("  Adding mapping: %s=>%s\n", rfid_id.c_str(), folder.c_str());
 				_map[rfid_id] = folder;
-
-				bool found=false;
-				for (String f: folders) {
-					if (f.equals(folder)) {
-						found = true;
-						break;
+				
+				if (folder.charAt(0)=='/') {
+					bool found=false;
+					for (String f: folders) {
+						if (f.equals(folder)) {
+							found = true;
+							break;
+						}
+					}
+					if (!found) {
+						INFO("WARNING: Found mapping for RFID id %s which maps to non-existing folder %s!\n", rfid_id.c_str(), folder.c_str());
 					}
-				}
-				if (!found) {
-					INFO("WARNING: Found mapping for RFID id %s which maps to non-existing folder %s!\n", rfid_id.c_str(), folder.c_str());
 				}
 			}
 		}
@@ -143,6 +145,16 @@ bool PlaylistManager::add_mapping(String id, String folder) {
 void PlaylistManager::_save_mapping() {
 	SPIMaster::select_sd();
 	File f = SD.open("/_mapping.txt", "w");
+	String s = create_mapping_txt();
+	unsigned char* buf = new unsigned char[s.length()];
+	s.getBytes(buf, s.length());
+	f.write(buf, s.length()-1);
+	f.close();
+	SPIMaster::select_sd(false);
+	delete buf;
+}
+
+String PlaylistManager::create_mapping_txt() {
 	String s;
 	for(std::map<String, String>::iterator it = _map.begin(); it != _map.end(); it++) {
 		s += it->first;
@@ -150,10 +162,5 @@ void PlaylistManager::_save_mapping() {
 		s += it->second;
 		s += '\n';
 	}
-	unsigned char* buf = new unsigned char[s.length()];
-	s.getBytes(buf, s.length());
-	f.write(buf, s.length()-1);
-	f.close();
-	SPIMaster::select_sd(false);
-	delete buf;
-}
+	return s;
+}