You can now also play MP3s streamed from the internet. (Very rough & wonky code. More or less proof-of-concept right now.)

include/data_sources.h

@@ -3,19 +3,21 @@
 #include <Arduino.h>
 #include <SD.h>
 #include "config.h"
+#include <HTTPClient.h>
 
 class DataSource {
 private:
 public:
 	DataSource() {};
-	~DataSource() {};
+	virtual ~DataSource() {};
 	virtual size_t read(uint8_t* buf, size_t len) = 0;
 	virtual uint8_t 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 void skip_id3_tag() {};
+	virtual bool usable() = 0;
 };
 
 class SDDataSource : public DataSource {
@@ -31,4 +33,23 @@ public:
 	size_t size();
 	void close();
 	void skip_id3_tag();
+	bool usable();
+};
+
+class HTTPSDataSource : public DataSource {
+private:
+	WiFiClient* _stream = NULL;
+	HTTPClient* _http = NULL;
+	uint32_t _length;
+	uint32_t _position;
+public:
+	HTTPSDataSource(String url, uint32_t offset=0);
+	~HTTPSDataSource();
+	size_t read(uint8_t* buf, size_t len);
+	uint8_t read();
+	size_t position();
+	void seek(size_t position);
+	size_t size();
+	void close();
+	bool usable();
 };

include/playlist.h

@@ -11,7 +11,7 @@ private:
 	bool _shuffled = false;
 	std::vector<String> _files;
 public:
-	Playlist(String path);
+	Playlist(String path, bool is_url=false);
 	void start();
 	bool has_track_next();
 	bool has_track_prev();

src/data_sources.cpp

@@ -9,6 +9,7 @@ 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();
@@ -33,3 +34,61 @@ void SDDataSource::skip_id3_tag() {
 		_file.seek(original_position);
 	}
 }
+
+
+
+////////////// HTTPSDataSource //////////////
+HTTPSDataSource::HTTPSDataSource(String url, uint32_t offset) {
+	uint8_t tries_left = 5;
+	int status;
+	do {
+		if (tries_left == 0) {
+			ERROR("Redirection loop? Cancelling!\n");
+			return;
+		}
+		tries_left--;
+		DEBUG("Connecting to %s...\n", url.c_str());
+		if (_http) delete _http;
+		_http = new HTTPClient();
+		const char* headers[] = {"location"};
+		_http->collectHeaders(headers, 1);
+		bool result = _http->begin(url);
+		DEBUG("HTTP->begin result: %d\n", result);
+		if (!result) return;
+		status = _http->GET();
+		DEBUG("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");
+			} else if (_http->hasHeader("location")) {
+				url = _http->header("location");
+			} else {
+				ERROR("Got redirection HTTP code, but could not find Location header.\n");
+				for(int i=0; i<_http->headers(); i++) {
+					DEBUG("  Header: %s=%s\n", _http->headerName(i).c_str(), _http->header(i).c_str());
+				}
+				return;
+			}
+		} else if (status != HTTP_CODE_OK) {
+			DEBUG("Unexpected HTTP return code. Cancelling.\n");
+			return;
+		}
+	} while (status != HTTP_CODE_OK);
+	_length = _http->getSize();
+	DEBUG("Content-Length: %d\n", _length);
+	_stream = _http->getStreamPtr();
+}
+
+HTTPSDataSource::~HTTPSDataSource() {
+	if (_stream) _stream->stop();
+	_http->end();
+	delete _stream;
+	delete _http;
+}
+bool HTTPSDataSource::usable() { return _http && _stream; }
+size_t HTTPSDataSource::read(uint8_t* buf, size_t len) { size_t result = _stream->read(buf, len); _position += result; return result; }
+uint8_t HTTPSDataSource::read() { _position++; return _stream->read(); }
+size_t HTTPSDataSource::position() { return _position; }
+void HTTPSDataSource::seek(size_t position) { return; /* TODO */ }
+size_t HTTPSDataSource::size() { return _length; }
+void HTTPSDataSource::close() { _stream->stop(); }

src/player.cpp

@@ -545,10 +545,16 @@ 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();
+	if (file.startsWith("/")) {
 		_file = new SDDataSource(file);
+	} else if (file.startsWith("https://")) {
+		_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;
 	}

src/playlist.cpp

@@ -5,7 +5,11 @@
 #include <algorithm>
 #include <ArduinoJson.h>
 
-Playlist::Playlist(String path) {
+Playlist::Playlist(String path, bool is_url) {
+	if (is_url) {
+		_files.push_back(path);
+		return;
+	}
 	// Add files to _files
 	SPIMaster::select_sd();
 	TRACE("Examining folder %s...\n", path.c_str());