esmp3/src/playlist.cpp

#include <playlist.h>
#include "spi_master.h"
#include "config.h"
#include <SD.h>
#include <algorithm>
#include <ArduinoJson.h>
#include <TinyXML.h>

Playlist::Playlist(String path) {
	if (path.startsWith("/")) {
		_add_path(path);
	} else if (path.startsWith("http")) {
		_examine_http_url(path);
	}
}

void Playlist::_add_path(String path) {
	SPIMaster::select_sd();
	TRACE("Examining folder %s...\n", path.c_str());
	if (!path.startsWith("/")) path = String("/") + path;
	if (!SD.exists(path)) {
		DEBUG("Could not open path '%s'.\n", path.c_str());
		SPIMaster::select_sd(false);
		return;
	}
	File dir = SD.open(path);
	File entry;
	while (entry = dir.openNextFile()) {
		String filename = entry.name();
		filename = filename.substring(path.length() + 1);
		String ext = filename.substring(filename.length() - 4);
		if (!entry.isDirectory() &&
			!filename.startsWith(".") &&
			( ext.equals(".mp3") ||
			  ext.equals(".ogg") ||
			  ext.equals(".wma") ||
			  ext.equals(".mp4") ||
			  ext.equals(".mpa"))) {
			TRACE("    Adding entry %s\n", entry.name());
			String title = filename.substring(0, filename.length() - 4);
			_files.push_back({entry.name(), title});
			bool non_ascii_chars = false;
			for(int i=0; i<filename.length(); i++) {
				char c = filename.charAt(i);
				if (c < 0x20 || c >= 0x7F) {
					non_ascii_chars = true;
					break;
				}
			}
			if (non_ascii_chars) {
				ERROR("WARNING: File '%s' contains non-ascii chars!\n", filename.c_str());
			}
		} else {
			TRACE("  Ignoring entry %s\n", filename.c_str());
		}
		entry.close();
	}
	dir.close();
	SPIMaster::select_sd(false);
	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({url, 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);
				}
			} else if (line.startsWith("http")) {
				if (title.length()==0) title = line;
				_files.push_back({line, 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({url, 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;
}

bool Playlist::has_track_prev() {
	return _current_track > 0;
}

bool Playlist::has_track_next() {
	return _current_track < _files.size()-1;
}

bool Playlist::track_prev() {
	if (_current_track > 0) {
		_current_track--;
		_position = 0;
		return true;
	}
	return false;
}

bool Playlist::track_next() {
	if (_current_track < _files.size()-1) {
		_current_track++;
		_position = 0;
		return true;
	}
	return false;
}

bool Playlist::set_track(uint8_t track) {
	if (track < _files.size()) {
		_current_track = track;
		_position = 0;
		return true;
	}
	return false;
}

void Playlist::track_restart() {
	_position = 0;
}

void Playlist::shuffle(uint8_t random_offset) {
	DEBUG("Shuffling the playlist with an offset of %d...\n", random_offset);
	for (int i=random_offset; i<_files.size(); i++) {
		int j = random(random_offset, _files.size()-1);
		if (i!=j) {
			TRACE("  Swapping elements %d and %d.\n", i, j);
			PlaylistEntry temp = _files[i];
			_files[i] = _files[j];
			_files[j] = temp;
		}
	}
	_shuffled = true;
	TRACE("Done.\n");
}

void Playlist::advent_shuffle(uint8_t day) {
	if (day > 24) day = 24;
	
	if (day > _files.size()) return;
	
	_files.insert(_files.begin(), _files[day - 1]);
	_files.erase(_files.begin() + day - 1, _files.end());
}

void Playlist::reset() {
	std::sort(_files.begin(), _files.end());
	_current_track = 0;
	_position = 0;
	_shuffled = false;
	_started = false;
}

String Playlist::get_current_file() {
	return _files[_current_track].filename;
}

uint32_t Playlist::get_position() {
	return _position;
}

void Playlist::set_position(uint32_t p) {
	_position = p;
}

bool Playlist::is_fresh() {
	return !_shuffled && !_started && _position==0 && _current_track==0;
}

void Playlist::dump() {
	for (int i=0; i<_files.size(); i++) {
		DEBUG("  %02d %2s %s\n", i+1, (i==_current_track) ? "->" : "", _files[i].filename.c_str());
	}
}

void Playlist::json(JsonObject json) {
	json["_type"] = "playlist";
	JsonArray files = json.createNestedArray("files");
	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();
	json["has_track_prev"] = has_track_prev();
}